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HMC235QS16G
MICROWAVE CORPORATION
GaAs MMIC SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz
FEBRUARY 2001
Features
WIDE BANDWIDTH: DC - 4 GHz ATTENUATION BITS: 1, 2, 4, 8, 16 dB MINIATURE QSOP-16 PACKAGE
General Description
The HMC235QS16G is a broadband 5-bit digital attenuator in a 16 - lead (narrow pitch) surface mount QSOP plastic package with an exposed ground slug. This package occupies the same area as an 8 lead SOIC package. The 1, 2, 4 and 8 dB bits have less than 10 degrees relative phase shift. The five primary attenuation states can be activated independently, or collectively for attenuation levels of 1 to 31 dB. The HMC235QS16G is ideal for cellular, PCS, WLL, LMDS and IF applications.This is the smallest 5 bit digital attenuator available.
Min. Typ. 5.0 5.3 25 7 4 10 7 0.5 1.4 3.2 7.0 14.0 26.0 0.5 1.3 3.2 7.0 14.0 25.0 31 12 7 18 11 1 2 4 8 16 31 1 2 4 8 16 31 3 6 8 7 18 7 24 23 38 22 12 11 24 12 28 30 44 32 1.5 2.6 4.8 9.0 17.9 35.0 1.5 2.7 4.8 9.0 17.9 35.0 Max. 5.4 6.0 Units dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB ns ns dBm dBm dBm dBm dBm dBm dBm dBm
2
SMT ATTENUATORS
Guaranteed Performance With 0/-5V Control, -40 to +85 deg C
Parameter Insertion Loss Attenuation Range Input Return Loss (All States) Output Return Loss (All States) Attenuation Accuracy: 1 dB Bit 2 dB Bit 4 dB Bit 8 dB Bit 16 dB Bit All Bits (31 dB) Attenuation Accuracy: 1 dB Bit 2 dB Bit 4 dB Bit 8 dB Bit 16 dB Bit All Bits (31 dB) Switching Characteristics tRISE, tFALL (10/90%) tON, tOFF (50% CTL to 10/90% RF) Input Power for 0.2 dB Compression Frequency DC- 2 GHz 2 - 4 GHz DC- 4 GHz DC- 2 GHz 2 - 4 GHz DC- 2 GHz 2 - 4 GHz 0.1 - 2 GHz
2 - 4 GHz
DC- 4 GHz 0.05 GHz Min. Atten. State 0.05 GHz All Atten. States 0.5 - 4 GHz Min. Atten. State 0.5 - 4 GHz All Atten. States 0.05 GHz Min. Atten. State 0.05 GHz All Atten. States 0.5 - 4 GHz Min. Atten. State 0.5 - 4 GHz All Atten. States
Input Third Order Intercept Point each tone = +5dBm typ.
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
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HMC235QS16G
MICROWAVE CORPORATION
HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz
FEBRUARY 2001
Insertion Loss
0 -1 INSERTION LOSS (dB) -2 -3 -40 C -4 -5 -6 +85 C -7 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) +25 C
Relative Attenuation
0 RELATIVE ATTENUATION (dB) -5 -10 4 dB -15 8 dB -20 16 dB -25 -30 31 dB -35 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) 2 dB 1 dB
2
SMT ATTENUATORS
Input + Output Return Loss (Reference State)
0
Relative Phase
70
OUTPUT RETURN LOSS (dB)
INPUT RETURN LOSS PHASE (DEGREES) -10
60 31 dB 50 40 1, 2, 4 dB 30 16 dB 20 10 8 dB
-20 OUTPUT RETURN LOSS -30
-40 0 0.5 1 1.5 2 2.5 3 3.5 4
0 0 0.5 1 1.5 2 2.5 3 3.5 4
FREQUENCY (GHz)
FREQUENCY (GHz)
Input Return Loss
0 31 dB INPUT RETURN LOSS (dB) 4 dB -10
Output Return Loss
0
OUTPUT RETURN LOSS (dB)
-10
REF. STATE
-20 REF. STATE -30 16 dB
-20 4 dB -30 31 dB 2 dB -40
-40 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz)
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
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HMC235QS16G
MICROWAVE CORPORATION
HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz
FEBRUARY 2001
Input Power for 0.2 dB Compression (Minimum Attenuation)
30
Input Power for 0.2 dB Compression (Maximum Attenuation)
30
2
SMT ATTENUATORS
0.2 dB COMPRESSION (dBm)
0.2 dB COMPRESSION (dBm)
-40 OC 25 20 +25OC 15 10 5 0 0 0.5 1 1.5 2 2.5 3 3.5 4 +85OC
25 -40 OC 20 15 10 +85OC 5 0 0 0.5 1 1.5 2 2.5 3 3.5 4 +25OC
FREQUENCY (GHz)
FREQUENCY (GHz)
IP3 (Minimum Attenuation)
60 +85OC 50 40 -40 OC 30 20 10 0 0 0.5 1 1.5 2 2.5 3 3.5 4 +25OC
IP3 (Maximum Attenuation)
60 50 +85OC 40 30 20 -40 OC 10 0 0 0.5 1 1.5 2 2.5 3 3.5 4 +25OC
IP3 (dBm)
FREQUENCY (GHz)
IP3 (dBm)
FREQUENCY (GHz)
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
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HMC235QS16G
MICROWAVE CORPORATION
HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz
FEBRUARY 2001
Schematic
A1 (16) B1 (15) A2 (14) A3 (13) A4 (12) B4 (11) A5 (10) B5 (9)
RF1 (2)
2
SMT ATTENUATORS
Att S et B5 Lo Lo Lo Lo Lo Hi R ef 1dB 2dB 4dB 8dB 16dB
RF2 (7)
4dB
1dB
2dB
8dB
16dB
HMC235
GND
GND
GND
GND
GND
Pins 1, 3 - 6 and 8 are GND.
Absolute Maximum Ratings
Control Voltage Range Storage Temperature Operating Temperature RF Input Power (0.5 - 4 GHz) Insertion Loss State Any Attenuation State +0.5 to -8.5 Vdc -65 to +150 deg C -40 to +85 deg C +27 dBm +13 dBm
Truth Table
Control Input 4 dB Bit A1 Hi B1 Lo Lo Lo Hi Lo Lo 1d B A2 Hi Lo Hi Hi Hi Hi 2d B A3 Hi Hi Lo Hi Hi Hi 8dB Bit A4 Hi Hi Hi Hi Lo Hi B4 Lo Lo Lo Lo Hi Lo 16dB Bit A5 Hi Hi Hi Hi Hi Lo
Control Voltages
State Low High Bias Condition 0 to -0.2V@20uA Max -3V@50uA Typ to -8V@500uA Max
Hi Hi Lo Hi Hi
Any combination of above states will provide an attenuation approximately equal to the sum of the bits selected.
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
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HMC235QS16G
MICROWAVE CORPORATION
HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz
FEBRUARY 2001
Outline
0.189/0.197 (4.80/5.00) EXPOSED GROUND SLUG (CONNECT TO RF GROUND PLANE)
DATE CODE YY = YEAR
2
SMT ATTENUATORS
0.150/0.157 (3.81/3.99)
HMC235 YYWW ZZZZ
WW = WEEK 0.228/0.224 (5.76/6.20) LOT NUMBER 0.037 0.015 (0.94 0.38) 0.080 (2.03)
PIN 1 PIN 1
0.105 (2.67) 0.044 0.015 (1.12 0.38)
0.051/0.059 (1.30 / 1.50) 0.0256 (.65) 0.010 (0.025) 0.000/0.004 (0.00/0.10)
0.004 / 0.010 (0.1 / 0.25) TYP 0.016 (0.41) MIN TYP
1.
2. 3.
MATERIAL: A) PACKAGE BODY - LOW STRESS INJECTION-MOLDED PLASTIC. 4. 5. B) LEADFRAME AND SLUG MATERIAL: COPPER ALLOY PLATING : LEAD - TIN SOLDER PLATE (LEAD AND SLUG) DIMENSIONS ARE IN INCHES (MILLIMETERS). UNLESS OTHERWISE SPECIFIED ALL TOL. ARE 0.005(0.13).
DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15 MM PER SIDE DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25 MM PER SIDE
Suggested Driver Circuit
Vz=5.1V Izt=50uA COMPENSATED DEVICES CD4689 TTL OR CMOS VCC GND VCC GND 74HCT04 (TTL) 74HC04 (CMOS) 100* 100pF * 100 *
Ax
GaAs ATTENUATOR CONTROL
10K
Bx
100pF*
-5 VDC
Simple driver using inexpensive standard logic ICs provides fast switching using minimum DC current. * Recommended values to suppress unwanted RF signals at Ax/Bx control lines. Component values may be adjusted for switching speed considerations. 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
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HMC235QS16G
MICROWAVE CORPORATION
HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz
FEBRUARY 2001
Evaluation Circuit Board
2
SMT ATTENUATORS
The circuit board used in the final application should use RF circuit design techniques. Signal lines should have 50 ohm impedance while the package ground leads should be connected directly to the ground plane similar to that shown above. A sufficient number of VIA holes should be used to connect the top and bottom ground planes. The evaluation circuit board as shown is available from Hittite upon request.
Evaluation Circuit Board Layout Design Details
Layout Technique Material Dielectric Thickness 50 Ohm Line Width Gap to Ground Edge Ground VIA Hole Diameter Connectors Grounded Co-Planar Waveguide (GCPW) Rogers 4350 0.020" (0.51 mm) 0.034" (0.86 mm) 0.010" (0.25 mm) 0.014" (0.36 mm) SMA-F ( EF - Johnson P/N 142-0701-806)
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
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