View RF2420_257457.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

RF2420
9
Typical Applications
* Power Control in Communication Systems * CMOS Compatible Programmable Attenuators * Commercial and Consumer Systems * Portable Battery-Powered Equipment
PROGRAMMABLE ATTENUATOR
Product Description
The RF2420 is a multistage monolithic programmable attenuator. The device is built using an advanced Gallium Arsenide process technology and has an attenuation programmability over a 44dB range in 2dB steps. The attenuation is set by five bits of digital data. The input and output of the device have a low VSWR 50 match. This unit is intended for use in systems that require RF transmit power control by digital means. Typical applications are in dual mode IS-54/55 compatible cellular transceivers and TETRA systems. No negative supply voltages are required.
0.157 0.150
-A0.008 0.004
0.393 0.386
0.018 0.014 0.050
0.244 0.229 8 MAX 0 MIN 0.009 0.007
0.068 0.053
NOTES: 1. Shaded lead is Pin 1. 2. All dimensions are excluding mold flash. 3. Lead coplanarity - 0.005 with respect to datum "A".
Optimum Technology Matching(R) Applied
Si BJT Si Bi-CMOS GaAs HBT SiGe HBT
u
Package Style: SOIC-16
GaAs MESFET Si CMOS
Features
* Single 3V to 6V Supply * 0dB to 44dB Attenuation Range * 4dB Insertion Loss * 5-bit Digitally Controlled Attenuation * Digitally Controlled Power Down Mode * DC to 950MHz Frequency Range
RF IN 1 2 dB VDD 2 VDD 3 VDD 4 8 dB VDD 5 VDD 6 VDD 7 20 dB VDD 8 10 dB 4 dB
16 G2 15 G4 14 G8 13 GND 12 GND 11 G10 10 G20 9 RF OUT
Ordering Information
RF2420 RF2420 PCBA Programmable Attenuator Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA
Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Rev A6 010720
9-9
ATTENTUATORS AND SWITCHES
0.034 0.016
9
RF2420
Absolute Maximum Ratings Parameter
Supply Voltage RF Input Power Operating Ambient Temperature Storage Temperature
Rating
-0.5 to +7.0 +17 -40 to +85 -40 to +150
Unit
VDC dBm C C
Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s).
Parameter
Overall
Frequency Range
Specification Min. Typ. Max.
DC to 950
Unit
MHz
Condition
T=25C and 5V at 420MHz Tuning of bypass capacitors is required for shifting the center frequency. See the evaluation board schematic for details.
Insertion Loss Attenuation Range Gain Flatness 3dB Bandwidth
4 0 to 44 500 50 50 1.2:1 +15 2, 4, 8, 10, 20
6 3
dB dB dB MHz MHz
In any 50MHz band, at max attenuation At 26dB attenuation At maximum attenuation
Input
Input Impedance Input VSWR Input 1dB Compression 1.5:1 dBm dB dB dB V V mA ns dBc dBc 1.5:1 V V mA mA Specifications Operating Limits Operating Power Down CMOS Level, 5 bits 2dB step 4dB through 20dB steps Voltage Supplied to input Voltage Supplied to input Into each control line
+13
Attenuation
9
ATTENTUATORS AND SWITCHES
Attenuation Settings Accuracy
0.5 1.0 2.5 VDD 0.4 <10 -30 -40 50 1.2:1 5 3 to 6 4 0.4 0.3 1.0
Attenuation Control
Attenuation "ON" Voltage Attenuation "OFF" Voltage Current Response Time
Output
IM3 Harmonic Output Output Impedance Output VSWR With 0dBm output in each of 2 tones
Power Supply
Voltage Current
8 0.75
9-10
Rev A6 010720
RF2420
Pin 1 Function RF IN Description
RF Input. This pin is not DC-blocked, and an external blocking capacitor is required. The value depends on the frequency used. The DC value on this pin is approximately equal to VDD.
Interface Schematic
RF IN
2
VDD
3 4 5 6 7 8 9
VDD VDD VDD VDD VDD VDD RF OUT
VDD supply connection. Bypassing is critical: To achieve maximum attenuation range the magnitude of the impedance at the operation frequency, as seen from the package pins, needs to be less than 0.5. The DC source to the pin may be a logic driver gate to implement a Power Down function. Same as pin 2. Same as pin 2. Same as pin 2. Same as pin 2. Same as pin 2. Same as pin 2. RF Output. Same as pin 1. Pin 1 and 9 are interchangeable.
RF OUT
10
G20
11 12 13 14 15 16
G10 GND GND G8 G4 G2
Control pin for the 10dB attenuator. This pin has an internal pull-down resistor, so when the pin is not connected the attenuator will be turned off. Ground. Ground. Control pin for the 8dB attenuator. This pin has an internal pull-down resistor, so when the pin is not connected the attenuator will be turned off. Control pin for the 4dB attenuator. This pin has an internal pull-down resistor, so when the pin is not connected the attenuator will be turned off. Control pin for the 2dB attenuator. This pin has an internal pull-down resistor, so when the pin is not connected the attenuator will be turned off.
Same as pin 10.
Same as pin 10.
Same as pin 10.
Same as pin 10.
Rev A6 010720
9-11
ATTENTUATORS AND SWITCHES
Control pin for the 20dB attenuator. This pin has an internal pull-down resistor, so when the pin is not connected the attenuator will be turned off.
Gxx
9
RF2420
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
P2 P2-1 P2-2 P2-3 P2-4 P2-5 NC NC NC 1 2 3 4 5 6 7 8 9 NC 10 C2 120 pF Note: Series resonant at F0; place C2 midway between pin 2 and pin 8 GND 3 4 8 dB 5 6 7 10 dB 12 P2-4 11 10 20 dB P1-3 C3 10 F
2420400B
P1 G2 G4 G8 G10 G20 RF IN 50 strip J1 SMA C1 100 pF 1 2 dB 2 4 dB 15 14 P2-3 13 C7 100 pF 16 C8 100 pF P2-1 C9 100 pF P2-2 P1-3 NC 1 2 3 GND VDD
C6 100 pF P2-5
9
ATTENTUATORS AND SWITCHES
8
9
C5 100 pF RF OUT C4 100 pF 50 strip J2 SMA
9-12
Rev A6 010720
RF2420
Evaluation Board Layout Board Size 2.020" x 2.020"
Board Thickness 0.031", Board Material FR-4
9
ATTENTUATORS AND SWITCHES
Rev A6 010720
9-13
RF2420
9
ATTENTUATORS AND SWITCHES
9-14
Rev A6 010720

▲Up To Search▲

Price & Availability of RF2420

	To Download RF2420 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .