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RF2498TriBand/QuadMode CDMA/GPS Low Noise Amplifier/Mixer
RF2498
TRI-BAND/QUAD-MODE CDMA/GPS LOW NOISE AMPLIFIER/MIXER
Package Style: QFN, 32-Pin, 5x5
GPS MIX IN
32
31
30
29
28
27
26
Features
GPS Receive Front-End Gain=37dB Meets IMD Tests with Three Gain States/Two Logic Control Lines Adjustable Mixer and LNA Bias Current Selectable Divide-by-2 Prescaler Integrated TX LO Buffer Amplifier
GPS+ 1
GPS LNA OUT 25 24 GPS LNA IN 23 PCS LNA IN 22 IP SET 21 PCS LNA OUT 20 CELL LNA IN 19 CELL LNA EMITTER 18 CELL LNA OUT 17 LNA GAIN 16 ENABLE
BAND SEL
GPS- 2
CDMA+ 3
CDMA- 4
FM+ 5
VCC2 7
LO IN 8 9 LO OUT 10 /2 SELECT 11 TX BUFF ENABLE 12 PCS RFA VCC 13 PCS MIX IN 14 CELL MIX IN 15 MIX GAIN
Applications
CDMA/Cellular/PCS/GPS Handsets JCDMA/GPS Handsets CDMA Modem/Data Cards Commercial and Consumer Systems Portable Battery-Powered Equipment
Functional Block Diagram
Product Description
The RF2498 is a high performance CDMA tri-band/quad-mode integrated LNA/mixer with GPS capability. The device is designed to meet all IS-98 sensitivity, intermodulation and single-tone requirements. The RF2498 integrates the tri-band LNA/downconverters with 27.5dB of gain control for the cellular band and 29dB for the PCS band. The RF2498 is designed for three state gain control solutions for IS-98 IMD testing. The device offers a dedicated GPS LNA/mixer with 37dB of gain. Additionally, a divide-by-2 prescaler to allow the use of either a single- or dual-band VCO is integrated. There is also a TX LO buffer. The design is flexible, in that the bias currents may be set using off-chip current reference resistors for the mixer and LNA blocks. The device is packaged in a plastic, 5mmx5mm, leadless chip carrier. Ordering Information
RF2498 RF2498PCBA-41X Tri-Band/Quad-Mode CDMA/GPS Low Noise Amplifier/Mixer Fully Assembled Evaluation Board
Optimum Technology Matching(R) Applied
GaAs HBT GaAs MESFET InGaP HBT SiGe BiCMOS Si BiCMOS SiGe HBT GaAs pHEMT Si CMOS Si BJT GaN HEMT
RF MICRO DEVICES(R), RFMD(R), Optimum Technology Matching(R), Enabling Wireless ConnectivityTM, PowerStar(R), POLARISTM TOTAL RADIOTM and UltimateBlueTM are trademarks of RFMD, LLC. BLUETOOTH is a trademark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. (c)2006, RF Micro Devices, Inc.
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
/2
FM- 6
IF SEL
ISET3
ISET2
ISET1
VCC1
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RF2498
Absolute Maximum Ratings Parameter
Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature
Rating
-0.5 to +5.0 +6 -40 to +85 -40 to +150
Unit
VDC dBm C C
Caution! ESD sensitive device.
Exceeding any one or a combination of the Absolute Maximum Rating conditions may cause permanent damage to the device. Extended application of Absolute Maximum Rating conditions to the device may reduce device reliability. Specified typical performance or functional operation of the device under Absolute Maximum Rating conditions is not implied. RoHS status based on EUDirective2002/95/EC (at time of this document revision). The information in this publication is believed to be accurate and reliable. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents, or other rights of third parties, resulting from its use. No license is granted by implication or otherwise under any patent or patent rights of RFMD. RFMD reserves the right to change component circuitry, recommended application circuitry and specifications at any time without prior notice.
Parameter
Overall
RF Frequency Range
Min.
Specification Typ.
800 to 900 1500 to 2200 1575.42
Max.
Unit
MHz MHz MHz GPS band
Condition
T = 25C, VCC =2.75V
IF Frequency Range
0.1 2.65 1.8 2.75
400 3.15 0.4 10
MHz V V V A ENABLE=0 Freq=869MHz to 894MHz Freq=832MHz to 870MHz LNA 50 match
Power Supply
Supply Voltage Logic High Logic Low Power Down Current
Cellular Band JCDMA Band
LNA (On)
Gain Noise Figure Input IP3 Current Isolation +9.0 +5.0 13.5 13.0 15.0 14.5 1.1 1.0 +11.0 +9.0 6.5 4.5 23 -4.0 +20.0 -2.5 2.5 +25.0 0 2.5 -1.8 4.0 16.5 16.0 1.3 1.2 dB dB dB dB dBm dBm mA mA dB dB dB dBm mA dB
IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0
LNA (Off)
Gain Noise Figure Input IP3 Current Isolation
Mixer - CDMA/JCDMA
Gain Noise Figure Input IP3 +1.0 11.5 1.5 13.0 3.0 7.5 14.0 +3.5 14.5 4.5 8.5 16.0 dB dB dB dB dBm
LO IN=-4dBm See note 1 and 2. Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON
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Rev A3 DS030711
RF2498
+11.0 Current +13.0 18.5 13.5 dBm mA mA Mixer Preamp OFF Mixer Preamp ON/Mixer/LO Input Amps Mixer Preamp OFF/Mixer/LO Input Amps
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
3 of 22
RF2498
Parameter
Mixer - CDMA/JCDMA, cont.
LO to RF Isolation LO Frequency Range IF Frequency Range 36 600 0.1 183.6 2300 400 dB dB MHz MHz
Min.
Specification Typ.
Max.
Unit
Condition
LO IN=-4dBm See note 1 and 2. Mixer Preamp ON Mixer Preamp OFF High and Low Side LO Injection. See note 3 and 4. Typical IF frequencies: 85.38MHz, 109.80MHz, 111.85MHz, 183.6MHz LO IN=-4dBm See note 1 and 2.
Mixer - FM
Gain Noise Figure Input IP3 Current LO to RF Isolation LO Frequency Range IF Frequency Range 36 600 0.1 183.6 2300 400 +1.5 +11.0 11.5 1.5 13.0 3.0 7.5 14.0 +3.5 +14.0 18.5 13.5 14.5 4.5 8.5 16.0 dB dB dB dB dBm dBm mA mA dB dB MHz MHz
Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON/Mixer/LO Input Amps Mixer Preamp OFF/Mixer/LO Input Amps Mixer Preamp ON Mixer Preamp OFF High and Low Side LO Injection See note 3 and 4. Typical IF frequencies: 85.38MHz, 109.80MHz, 111.85MHz, 183.6MHz
Other
LO-IF Isolation RF-IF Isolation LNA Out to Mixer In Isolation LO-LNA In Isolation, Any State 30 40 40 35 dB dB dB dB Freq=1930MHz to 1990MHz Freq=1840MHz to 1870MHz LNA 50 match 13.5 13.0 Noise Figure Input IP3 Current Isolation +8.0 -2.0 15.5 15.0 1.5 1.4 +12.0 +4.0 6.5 4.5 20 -6 +20.0 -4 4 +26.0 0 4 6 17.5 16.5 1.8 1.7 dB dB dB dB dBm dBm mA mA dB dB dB dBm mA dB IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0
US PCS Band Korean PCS Band
LNA (On)
Gain
LNA (Off)
Gain Noise Figure Input IP3 Current Isolation
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7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A3 DS030711
RF2498
Parameter
Mixer
Gain Noise Figure Input IP3 Current LO to RF Isolation LO Frequency Range IF Frequency Range 36 30 1600 0.1 183.6 2400 400 +1.5 +11.0 12.0 2.5 14.0 4.5 7.0 15 +5.0 +13.0 19.0 14.0 15.5 6.5 8.5 17 dB dB dB dB dBm dBm mA mA dB dB MHz MHz
Min.
Specification Typ.
Max.
Unit
LO IN=-4dBm See note 1.
Condition
Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON/Mixer/LO Input Amps Mixer Preamp OFF/Mixer/LO Input Amps Mixer Preamp ON Mixer Preamp OFF High and Low Side LO Injection Typical IF frequencies: 183.6MHz, 210.38MHz, 220.38MHz
Other
LO-IF Isolation RF-IF Isolation LNA Out to Mixer In Isolation LO-LNA In Isolation, Any State 36 40 30 35 40 dB dB dB dB Freq=1575.42MHz LNA 50 match 17.0 16 Noise Figure Input IP3 Current Isolation +1.0 -5.0 19.0 18 1.3 1.25 +5.0 -1.0 6.5 4.5 20 1.7 1.7 dB dB dB dB dBm dBm mA mA dB LO IN=-4dBm See note 1. 16 18 5.5 7.0 Input IP3 Current LO to RF Isolation LO Frequency Range LO Input Power Range IF Frequency Range 1350 -10 0.1 -4 183.6 1800 0 400 -7.5 -5.5 15.5 dB dB dB dBm mA dB MHz dBm MHz Typical IF frequencies: 183.6MHz, 210.38MHz, 220.38MHz High and Low Side LO Injection Preamp/Mixer/LO Input Amps High Side LO Injection. Low Side LO Injection. IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0
GPS Band
LNA (On)
Gain
Mixer
Gain Noise Figure
Other
LO-IF Isolation RF-IF Isolation LNA Out to Mixer In Isolation LO-LNA In Isolation, Any State 36 40 30 35 40 dB dB dB dB
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF2498
Parameter Control Lines
Input Capacitance 1 pF BAND SEL, IF SEL, IP SET, LNA GAIN, ENABLE, MIX GAIN, TX BUFF ENABLE, /2 SELECT
Min.
Specification Typ.
Max.
Unit
Condition
Local Oscillator Input
Cellular - CDMA/FM/JCDMA Input Power Input Frequency PCS Input Power Input Frequency GPS Input Power Input Frequency -10 1350 -4 0 1800 dBm MHz High and Low Side LO Injection. -10 1600 -4 0 2300 dBm MHz High and Low Side LO Injection. -10 600 1200 -4 0 1078 2156 dBm MHz MHz See note 3. High and Low side injection. See note 4. High and Low side injection.
TX (Local Oscillator) Buffer
Cellular - CDMA/FM/JCDMA Output Power Output Frequency Output Power Output Frequency Current Consumption PCS Output Power Output Frequency Current Consumption -11 1600 2 -8 2300 dBm MHz mA Single-ended 50 load High and Low Side LO Injection -11 600 -11 1200 2 -6.5 2156 MHz mA -8 1078 dBm MHz Single-ended 50 load See note 3. High and Low Side LO Injection. Single-ended 50 load See note 4. High and Low Side LO Injection.
NOTE 1. Mixer performance can be changed with external IF load/tuning. NOTE 2. Specifications apply for conditions of LO Divider enabled or disabled. NOTE 3. LO Divider disabled. LO Divider disabled logic conditions: A) BAND SELECT=1; /2 SELECT=Immaterial.B) BAND SELECT=0; /2 SELECT=1 NOTE 4. LO Divider enabled. LO Divider enabled logic conditions: A) BAND SELECT=0; /2 SELECT=0
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Rev A3 DS030711
RF2498
Evaluation Board Current Measurement
BAND SEL CDMA CellularHigh IIP3 LNA Mode* LNA On, Mixer Preamp On, TX Buffer Off, /2 Off LNA On, Mixer Preamp Off, TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp On, TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp Off, TX Buffer Off, /2 Off FM/JCDMALow Current LNA Mode LNA On, Mixer Preamp On, TX Buffer Off, /2 Off LNA On, Mixer Preamp Off, TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp On, TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp Off, TX Buffer Off, /2 Off CDMA PCS High IIP3 LNA Mode* LNA On, Mixer Preamp On TX Buffer Off, /2 Off* LNA On, Mixer Preamp Off TX Buffer Off, /2 Off* LNA Bypassed, Mixer Preamp On TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp Off TX Buffer Off, /2 Off GPS LNA On, Mixer On 1 0 1 X X 0 0 X 24.0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 1 0 1 0 1 1 X X 0 0 0 0 1 1 1 1 27.5 25.5 21.0 16.0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 1 0 1 0 0 0 X X 0 0 0 0 1 1 1 1 25.0 20.0 20.5 15.5 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0 1 0 1 0 1 1 X X 0 0 0 0 1 1 1 1 27.0 22.0 20.5 15.5 IF SEL ENABLE LNA GAIN MIX GAIN IP SET TX BUFF ENABLE /2 SELECT IDC (mA)
NOTES: All IDC current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode). TX Buffer On: Add 2mA to total current. /2 Select On: Add 2mA to total current. "X" denotes setting does not impact current. *For Paging mode set IPSET=0. Total current reduced 2mA.
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
7 of 22
RF2498
Cascaded Performance (Typical Values for VCC =2.75V)
NOTE: All total current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode).
CELL CDMA LNA ON Parameter Mixer Preamp On Cascaded: Gain (dB) Noise Figure (dB) Input IP3 (dBm) LO to IF Isolation (dB) IF1 to RF Isolation (dB) IF2 to RF Isolation (dB) LO to LNA IN Isolation (dB) Total Current (mA) 25.0 2.1 -8.5 30 40 40 45 *27.0 7.5 13.0 +8.9 30 40 40 45 20.5 15.0 4.5 +0.6 30 40 40 45 *22.0 -2.5 19.5 +17.6 30 40 40 45 15.5 LNA OFF LNA ON LNA OFF LNA at Max IIP3, IPSET=1 Mixer Preamp Off
NOTE: Assumes 3dB image filter insertion loss. The TX Buffer Enable is off. Div/2 function is off. Numbers represent high linearity LNA bias setting IPSET=1. *For Paging mode set IPSET=0. Total current reduced 2mA. FM/JCDMA Parameter Cascaded: Gain (dB) Noise Figure (dB) Input IP3 (dBm) LO to IF Isolation (dB) IF1 to RF Isolation (dB) IF2 to RF Isolation (dB) LO to LNA IN Isolation (dB) Total Current (mA) 24.5 2.1 -8.1 30 40 40 45 25.0 7.5 13.0 +8.9 30 40 40 45 20.5 14.5 4.8 +1.6 30 40 40 45 20.0 -2.5 19.5 +18.4 30 40 40 45 15.5 LNA ON LNA OFF LNA ON LNA OFF Mixer Preamp On Mixer Preamp Off
NOTE: Assumes 3dB image filter insertion loss. The TX Buffer Enable is off. Div/2 function is off. Numbers represent low current LNA bias setting IPSET=0.
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Rev A3 DS030711
RF2498
PCS CDMA LNA ON Parameter Cascaded: Gain (dB) Noise Figure (dB) Input IP3 (dBm) LO to IF Isolation (dB) IF1 to RF Isolation (dB) IF2 to RF Isolation (dB) LO to LNA IN Isolation (dB) Total Current (mA) 26.5 2.2 -7.5 40 40 40 40 *27.5 7 14 +11.8 40 40 40 40 21.0 17.0 5.0 +0.2 40 40 40 40 *22.5 -2.5 22 +19.0 40 40 40 40 16.0 LNA OFF LNA ON LNA OFF LNA at Max IIP3, IPSET=1 Mixer Preamp ON Mixer Preamp OFF
NOTE: Assumes 3dB image filter insertion loss. The TX Buffer Enable is off. Div/2 function is off. Numbers represent high linearity LNA bias setting IPSET=1. *For Paging mode set IPSET=0. Total current reduced 2mA.
Cascaded Performance (Typical Values for VCC =2.75V)
NOTE: All total current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode).
Parameter Cascaded: Gain (dB) Noise Figure (dB) Input IP3 (dBm) Total Current (mA) 35.5 1.6 -23.0 24 GPS High IIP3 LNA Mode, IPSET=1 IPSET=0 34.5 1.6 -22.0 22
NOTE: Assumes 1.5dB image filter insertion loss. The TX Buffer Enable is off. /2 Select is off.
Cellular CDMA Gain Control Mode LNA GAIN MIX GAIN
High Gain Mid Gain Low Gain Ultra Low Gain 1 1 0 0 1 0 1 0 IMD Test 1 and 2 IMD Test 3 and 4
Comments
IMD Test 5 and 6 option 1 IMD test 5 and 6 option 2
Note: Contact RFMD for Application note on gain control PCBA layout and software recommendations.
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
9 of 22
RF2498
Pin 1 Function GPS+ Type Description AO GPS IF output. Open collector. Interface Schematic
GPS+ GPS-
2 3
GPSCDMA+
AO AO
GPS IF output. Open collector. CDMA IF output. Open collector.
See pin 1.
CDMA+ CDMA-
4 5
CDMAFM+
AO AO
CDMA IF output. Open collector. FM IF output. Open collector. "Current combiner" IF interface to SAW filter recommended. (See "IF Output Matching Network" section.)
See pin 3.
FM+ FM-
6 7 8
FMVCC2 LO IN
AO P AI
FM IF output. Open collector. "Current combiner" IF interface to See pin 5. SAW filter recommended. (See "IF Output Matching Network" section.) VCC connection for internal LO amplifiers. Internal RF bypass capacitor. External bypass capacitor between 1nF and 47nF required. LO single-end input. Matched to 50.
LO IN 70
9 10
LO OUT /2 SELECT
AO DI
LO output. Internal DC block. Logic input. Low enables /2 circuitry in cellular mode. The divider is disabled when BAND SEL (pin 27) is high, regardless of the state of pin 10. The divider can only be enabled when BAND SEL is low and pin10 is low. Pin 10 can be tied to a low state allowing BANDSEL (pin 27) to control the LO divider function, if using a single LO input source. Logic input. High enables TX LO output buffer amplifiers. See pin 11.
11
TX BUFF ENABLE PCS RFA VCC PCS MIX IN
DI
TX BUF
12 13
P AI
VCC connection for PCS mixer preamplifier. PCS mixer RF single-end input.
PCS MIX IN
14
CELL MIX IN
AI
Cellular mixer RF single-end input. Matched to 50.
CELL MIX IN
10 of 22
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Rev A3 DS030711
RF2498
Pin 15 Function MIX GAIN Type Description Interface Schematic Logic input. Logic high turns on PCS or cellular mixer preamp and DI
provides maximum gain. Logic low will bypass the PCS and cellular mixer preamp.
MIX GAIN
16
ENABLE
DI
Logic input. Low level powers down the IC.
ENABLE
17
LNA GAIN
DI
Logic input. High activates cellular or PCS LNAs. Low selects LNA bypass mode for both bands.
LNA GAIN
18 19 20
CELL LNA OUT CELL LNA EMITTER CELL LNA IN
AO AO AI
Cellular LNA output. Simple external L-C components required for matching and VCC supply. Cellular LNA emitter. A small inductor connects this pin to ground. Cellular LNA gain can be adjusted by the inductance. Cellular LNA input.
See pin 20. See pin 20.
VCC CELL LNA OUT CELL LNA IN
CELL LNA EMITTER
21
PCS LNA OUT
AO
PCS LNA output. Simple external L-C components required for matching and VCC supply.
PCS LNA IN
VCC PCS LNA OUT
22
IP SET
DI
Logic input. High selects high IIP3 LNA "boost" modes for GPS, cellular and PCS CDMA paths. Low selects "normal" LNA IIP3 mode for GPS, cellular and PCS CDMA paths. Bias setting resistor at pin 31 allows for the adjustment of LNA IIP3 in boost mode. PCS LNA input. For best performance, simple external matching required. GPS LNA input. For best performance, simple external matching required.
IP SET
23 24
PCS LNA IN GPS LNA IN
AI AI
See pin 21.
VCC GPS LNA OUT GPS LNA IN
25 26
GPS LNA OUT IF SEL
AO DI
GPS LNA output. Simple external L-C components required for matching and VCC supply. Logic input. High selects CDMA IF outputs; low selects FM or GPS IF outputs.
See pin 24.
IF SEL
27
BAND SEL
DI
Logic input. High level selects PCS or GPS band; low level selects cellular band. The LO divider circuitry is disabled when BAND SEL is high, regardless of the state of pin 10 (/2 SELECT). When BAND SEL is low, pin 10 can be selected high or low. If using a single LO input, pin 10 can be tied to a low state allowing BAND SEL to control the LO divider function.
BAND SEL
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
11 of 22
RF2498
Pin 28 Function GPS MIX IN Type Description AI GPS mixer RF single-end input. Interface Schematic
GPS MIX IN
29
VCC1
P
30 31 32 Pkg Base
Legend:
ISET1 ISET2 ISET3 GND
AO AO AO P
DC supply for internal reference, logic control, cellular mixer preamp, and GPS mixer preamp (PCS mixer preamp has its' own DC supply, PCS_RFA_VCC). External bypass capacitor between 1nF and 47nF required. Resistor for internal voltage reference setting. Recommended value 5.1k. Resistor to ground sets the LNA current in boost mode (all three LNAs). Higher resistance results in lower current. Resistor to ground sets preamp and mixer currents in all bands. Higher resistance results in lower currents. Ground connection. The backside of the package should be soldered to a top side ground pad which is connected to the ground plane with multiple vias.
DI=Digital Input from Baseband Chip AI=Analog Input AO=Analog Output P=VCC or GND
ISET Pins ISET1 sets the internal reference voltage for the bias control circuits to all functional blocks. An external resistor of 5.1k to ground is required. We do not recommend adjusting this resistor value. This resistor is pulled out to allow for a higher precision off chip value and not as a significant tuning adjustment. ISET2 sets the DC current through the LNAs in all bands when IPSET is high. Higher resistance to ground results in lower current through the LNA. Increasing the LNA current will improve the IIP3 of the LNA and slightly increase gain in all modes. NF typically will get worse as you increase current. Increasing the LNA current in one mode, i.e. Cellular, will also increase the LNA current for the high IPSET state for PCS and the GPS LNAs as well. ISET3 sets the DC current through the mixer and mixer preamplifier for all bands. Higher resistance to ground results in lower current. Lower current will improve mixer NF but will degrade IIP3. Mixer and the mixer preamp gain is not significantly changed with current.
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Rev A3 DS030711
RF2498
Package Drawing
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF2498
Application Schematic
VCC BAND SEL IF SEL
4 GND 5 1 GND IN GND 2
OUT GND
6
33 nH
3
See Note 13
GPS RF Saw
15
See Note 11
6.8 nH
See Note 14
TBD GPS IF VCC TBD
33 nF
See Note 4
VCC 18 nH
See Notes 12 and 15 See Note 10
See Note 1
See Note 2
See Note 3
1.0 pF 5.1 k GPS LNA IN
See Note 4
7.5 k TBD TBD TBD
20 k
32 1 TBD VCC
10 9 4 5
31
30
29
28
27
26
25 24
2.7 nH
See Notes 14 and 15 See Notes 7 and 15
See Note 10
33 nF
33 nH 1.2 nH
0.75 pF PCS LNA IN
2 TBD TBD TBD
23
33 nF
See Note 4
See Notes 14 and 15
CDMA+ CDMA-
TBD
CDMA IF SAW
3
22 4.7 nH
See Notes 12 and 15
IP SET
See Note 11
TBD
TBD
4
21
10
VCC
5 TBD VCC
10 9 4 5
20
See Notes 14 and 15
2.7 nH CELL LNA IN
FM+ FM-
TBD
TBD
TBD
TBD 7
/2
6
19 1.2 nH 18
See Notes 6 and 15
See Note 4
33 nF
33 nH
See Notes 7 and 15
FM IF SAW
8 9 10 11 12 13 14 15 16
17
10 nH
VCC
VCC
See Notes 12 and 15
LNA GAIN ENABLE
LO IN 2.2 nH LO OUT DIV EN TX BUF EN 3.3 nH
6 3 OUT
See Note 14
MIX GAIN
See Note 4
33 nF VCC 1.2 pF
5
GND GND
GND GND
4 1
200 VCC
See Note 9
2
IN
See Note 8
Cell RF Saw
2.4 pF
See Note 14
See Note 4
6 3
OUT
TBD
TBD
1 pF
33 nF
5
GND GND
GND GND
4 1
2
See Note 8
PCS RF Saw
IN
33 nF
See Note 4
Note: If any functional blocks are not being used, the unused pins can be left with no connection. Layout Note: To minimize losses and radiation, the RF signal traces should be as short as possible. The IF+ and IF- outputs traces should be symmetrical. All bypass capacitors and matching capacitors must have a ground via very close to the capacitor. Each capacitor should have its own ground via. All traces should be 50 transmission lines. Position inductors to reduce coupling (see note 15). NOTES: 1. This resistor sets mixer preamp and mixer currents in all bands. Lowering the resistance results in higher currents. 2. This resistor sets LNA currents of all bands in boost mode. Increasing the resistor value results in lower currents. 3. Sets internal bias voltage. Recommend 5.1 k. 4. DC blocking capacitor. 5. PCS LNA Input Matching. Optimize for NF. 6. Determines trade off between IIP3 and Gain. Higher value inductor means lower gain and higher IIP3. 7. Cell/PCS LNA Input Matching for optimum IIP3. Low impedance path to ground at low frequency for optimum IIP3. 8. For cell and PCS mixer input matching.
9. PCS Interstage matching. As the value of the inductance is increased, the PCS mixer preamp gain will decrease and the IIP3 will increase and vice versa. 10. For optimum NF and input matching. As the value of the capacitance is increased, the NF will become worse. 11. To optimize performance over temperature and bias. 12. For output matching and a DC supply bias choke. 13. GPS mixer input matching for optimum IIP3. Low impedance path to ground at low frequency for optimum IIP3. 14. Input or Output matching. 15. Coupling of coils on the input, output, and emitter (where applicable) of any LNA should be minimized to reduce the risk of oscillation. We recommend separating the inductors and/or positioning them 90 o relative to each other.
NOTE: IF output matching component values are dependent on board layout, IF SAW filter and the IF frequency selected. Please contact RFMD application engineering for assistance with IF output matching.
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Rev A3 DS030711
RF2498
Evaluation Board Schematic
GND 5 GND
L13 33 nH C42 33 nF
C40 33 nF C41 DNI
FL6
2
50 strip
J14 GPS MIX IN
4 OUT GND
GND 3
1 IN
GPS RF Saw
J1 GPS IF
50 strip
C4 6.8 pF C21 VCC 100 pF L4 180 nH BAND SEL L10 120 nH R1 5.6 k C34 DNI C27 6.8 pF R5 7.5 k R4 20 k R6 5.1 k C43 33 nF VCC IF SEL
6
C48 DNI L19 6.8 nH L20 18 nH C50 33 nF R8 10 C24 100 pF VCC L5 33 nF 50 strip
J13 GPS LNA OUT
J2 CDMA IF
50 strip
C2 33 nF
C6 5.1 pF C17 DNI L6 180 nH C39 6.8 pF
C32 2.7 nH L23 DNI C19 1.0 pF 50 strip
J12 GPS LNA IN
32 C12 DNI C10 DNI L2 DNI C11 FL2 10 DNI
9 4 5
31
30
29
28
27
26
25 24 C62 33 nF
L26 DNI C22 100 pF C31 DNI
VCC
1
CDMA IF SAW
L7 DNI
L11 120 nH
R2 10 k
C35 DNI
C28 6.8 pF
2
23
R11 1.2 nH L25 33 nH C70 0.75 pF VCC 50 strip
J11 PCS LNA IN
3 C37 6.8 pF
22
IP SET
4
21
J3 FM IF
50 strip C3 33 nF
10 4 5
C5 6.2 pF C18 DNI L14 DNI C30 DNI C23 100 pF VCC L8 150 nH L12 120 nH R3 24 k C36 DNI C38 6.8 pF L9 DNI C44 33 nF C29 6.8 pF
C64 33 nF L16 33 nH L24 1.2 nH
L22 4.7 nH L27 2.7 nH
R9 10 C63 33 nF
C26 100 pF 50 strip J10 PCS LNA OUT J9 CELL LNA IN
5
20
FL3
/2
6
19
50 strip
C15 DNI C13 DNI
L3 DNI C14 DNI
9
7
18
IF SAW
8 9 10 11 12 13 14 15 16
17 L21 10 nH ENABLE MIX GAIN LNA GAIN C69 2.4 pF
2498310, Rev. 1
C25 100 pF VCC
VCC J4 LO IN J5 LO OUT 50 strip R7 DNI 50 strip C1 DNI
L17 2.2 nH
50 strip
J8 CELL LNA OUT
DIV EN TX BUF EN
C8 33 nF
C61 33 nF L15 1.2 pF
R10 0 C9 33 nF
C56 DNI
5 6 3 OUT
FL4
GND GND 4 1
GND GND
R12 200 C33 33 nF J6 PCS MIX IN 50 strip
L18 3.3 nH VCC C59 DNI
5
2
Cell RF Saw
C58 DNI 50 strip
IN
J7 CELL MIX IN
FL5
GND
OUT GND GND
GND
C66 DNI
4
1 3
IN
2
*IF FREQ = 184 MHz P1-1 C45 33 nF P1-2 C51 33 nF P1-3 C52 33 nF P1-4 C49 33 nF P1 1 2 3 4 CON4 P2-4 C55 33 nF DIV EN IF SEL IP SET BAND SEL P2-3 C53 33 nF P2-2 C46 33 nF P2-1 C54 33 nF P2 1 2 3 4 CON4 ENABLE TX BUF EN MIX GAIN LNA GAIN
C7 33 nF
C16 1 pF
6
PCS RF SAW
P3 P3-1 C20 1 F 1 2 3 CON3 VCC GND GND
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
15 of 22
RF2498
Evaluation Board Layout Board Size 3.0" x 3.0"
Board Thickness 0.064", Board Material FR-4, Multi-Layer
16 of 22
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A3 DS030711
RF2498
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
17 of 22
RF2498
18 of 22
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A3 DS030711
RF2498
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
19 of 22
RF2498
Cellular Band LO Output Power versus LO Input Power
-6.0
Cellular Band LO Output Power versus VCC
-6.00
(Freq=2128MHz, Divider=0(ON), VCC 2.75V, Temp 25 C)
o
(Freq=2128MHz, Divider=0 (on), Input Power-4dBm, Temp 25 C)
o
LB-LO Output Power (dBm)
LB-LO Output Power (dBm)
-6.5
-6.50
-7.0
-7.00
-7.5
-7.50
-8.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0
-8.00 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15
LO Input Power (dBm)
VCC (V)
Cellular Band LO Output Power versus LO-Input Power
-6.0
Cellular Band LO Output Power versus VCC
-6.00
(Freq=1064MHz, Divider 1(off), VCC=2.75V, Temp 25 C)
o
(Freq=1064MHz, Divider=1(off), Input Power-4dBm, Temp 25 C)
o
-6.5
LB-LO Output Power (dBm)
-7.5
LB-LO Output Power (dBm)
-7.0
-7.00
-8.0
-8.00
-8.5
-9.0
-9.00
-9.5
-10.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0
-10.00 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15
LO-Input Power (dBm)
VCC (V)
-6.0
PCS Band LO Output Power versus LO-Input Power (Freq=2144MHz, VCC 2.75V, Temp 25oC)
PCS Band LO Output Power versus VCC
-6.00
(Freq=2144MHz, Input Power -4dBm, Temp 25 C)
o
-6.50
HB-LO Output Power (dBm)
HB-LO Output Power (dBm)
-7.0
-7.00
-7.50
-8.0
-8.00
-8.50
-9.0
-9.00
-9.50
-10.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0
-10.00 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15
LO-Input Power (dBm)
VCC (V)
20 of 22
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Rev A3 DS030711
RF2498
PCB Design Requirements
PCB Surface Finish The PCB surface finish used for RFMD's qualification process is electroless nickel, immersion gold. Typical thickness is 3inch to 8inch gold over 180inch nickel. PCB Land Pattern Recommendation PCB land patterns are based on IPC-SM-782 standards when possible. The pad pattern shown has been developed and tested for optimized assembly at RFMD; however, it may require some modifications to address company specific assembly processes. The PCB land pattern has been developed to accommodate lead and package tolerances. PCB Metal Land Pattern
A = 0.64 x 0.28 (mm) Typ. B = 0.28 x 0.64 (mm) Typ. C = 3.50 (mm) Sq. 3.50 Typ. 0.50 Typ.
Pin 32 Pin 1 Dimensions in mm.
B A A A A A A A A B
B
B
B
B
B
B
B A A A
Pin 24
0.50 Typ.
1.75 Typ. 3.50 Typ.
C
A A A A A
0.55 Typ. 0.55 Typ.
B
B
B
B
B
B
B
Pin 16
1.75 Typ.
Figure 1. PCB Metal Land Pattern (Top View)
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
21 of 22
RF2498
PCB Solder Mask Pattern Liquid Photo-Imageable (LPI) solder mask is recommended. The solder mask footprint will match what is shown for the PCB metal land pattern with a 2mil to 3mil expansion to accommodate solder mask registration clearance around all pads. The center-grounding pad shall also have a solder mask clearance. Expansion of the pads to create solder mask clearance can be provided in the master data or requested from the PCB fabrication supplier.
A = 0.74 x 0.38 (mm) Typ. B = 0.38 x 0.74 (mm) Typ. C = 3.60 (mm) Sq. 3.50 Typ. 0.50 Typ.
Pin 32 Pin 1 Dimensions in mm.
BBBBBBBB A A A A A A A A BBBBBBBB C A A A A A A A A
Pin 24
0.50 Typ.
1.75 Typ. 3.50 Typ.
0.55 Typ.
0.55 Typ. 1.75 Typ.
Pin 16
Figure 2. PCB Solder Mask Pattern (Top View)
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Rev A3 DS030711

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