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 GaAs 4 Bit Digital Attenuator 2, 4, 8, 16 dB Bits DC-2 GHz
AT002D4-31 Features
Low DC Power Consumption Attenuation in 2 dB Steps to 30 dB with High Accuracy 14 Lead Hermetic Surface Mount Package Capable of Meeting MIL-STD Requirements6
0.017 (0.43 mm) 0.500 (12.70 mm) MAX.
-31
ORIENTATION MARK 0.270 (6.86 mm) MAX.
0.050 (1.27 mm) 0.395 (10.03 mm) MAX.
Description
The AT002D4-31 is an MMIC FET digital attenuator consisting of four monolithic attenuators with an LSB of 2 dB and a total attenuation of 30 dB with all attenuators connected. This attenuator is recommended for fast response, low power consumption AGC circuits. Typical applications include AGC circuits for radar processing, instrumentation and levelers in RF equipment.
0.070 (1.78 mm) 0.040 (1.02 mm)
0.006 (0.15 mm) 0.004 (0.10 mm)
0.075 (1.91 mm) MAX. 0.340 (8.64 mm) 0.315 (8.00 mm)
0.038 (0.97 mm) 0.025 (0.64 mm)
Electrical Specifications at 25C
Parameter1 Insertion Loss2 Frequency5 DC-0.5 GHz DC-1.0 GHz DC-2.0 GHz DC-1.0 GHz DC-2.0 GHz DC-1.0 GHz DC-2.0 GHz VSWR DC-0.5 GHz DC-2.0 GHz 28 26 Min. Typ. 2.6 3.3 5.0 30 30 Max. 3.0 3.9 5.8 Unit dB dB dB dB dB
Attenuation Range3 Attenuation Accuracy Per Bit
(0.4 + 5% of Attenuation Setting in dB) (0.5 + 5% of Attenuation Setting in dB) 1.3:1 1.6:1 1.5:1 1.8:1
Operating Characteristics at 25C
Parameter Switching Characteristics Condition Rise, Fall (10/90% or 90/10% RF) On, Off (50% CTL to 90/10% RF) Video Feedthru4 0.5-2 GHz For Two-tone Input Power 13 dBm VLow = 0 to -0.2 V @ 20 A Max. VHigh = -5 V @ 50 A to -9 V @ 200 A Max.
4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth. 5. DC = 300 kHz. 6. See Quality/Reliability section.
Frequency
Min.
Typ. 7 14 20 27 43 32
Max.
Unit ns ns mV dBm dBm dBm
Input Power for 1 dB Compression Intermodulation Intercept Point (IP3) Control Voltages
0.5-2 GHz 0.001-0.5 GHz
1. All measurements made in a 50 system, unless otherwise specified. 2. Insertion loss changes by 0.003 dB/C. 3. Attenuation value referenced above insertion loss.
Alpha Industries, Inc. [781] 935-5150 * Fax [978] 241-7906 * Email sales@alphaind.com * www.alphaind.com
Specifications subject to change without notice. 9/01A
1
GaAs 4 Bit Digital Attenuator 2, 4, 8, 16 dB Bits DC-2 GHz
AT002D4-31
Typical Performance Data
3.5 +85C 30 30 dB 1.0 20
Insertion Loss (dB)
3.0
Attenuation (dB)
16 dB 0.6 15 10 5 0 8 dB 0.4 4 dB 0.4 2 dB 0.3 DC 0.2 0.4 0.6 0.8 1.0 2.0
2.5 2.0 1.5 1.0 DC 0.2 0.4
-55C
0.6
0.8
1.0
2.0
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
2.5 2.2 1.9
Attenuation vs. Frequency by BIT
Absolute Maximum Ratings
Characteristic RF Input Power (RF In) Control Voltage (VC) Value 2 W > 500 MHz 0/-8 V 0.5 W @ 50 MHz 0/-8 V +0.2 V, -10 V -55C to +125C -65C to +150C 25C/W
1.6 1.3 1.0 DC 0.2 0.4 0.6 0.8 1.0 3.0
Operating Temperature (TOP) Storage Temperature (TST) Thermal Resistance (JC)
Pin Out
V7 V6 V8 GND J1 GND GND GND J2
Frequency (GHz)
VSWR vs. Frequency (All States)
Truth Table
V1 -5 0 -5 -5 -5 0 V2 0 -5 0 0 0 -5 V3 -5 -5 0 -5 -5 0 V4 0 0 -5 0 0 -5 V5 0 0 0 -5 0 -5 V6 -5 -5 -5 0 -5 0 V7 -5 -5 -5 -5 0 0 V8 0 0 0 0 -5 -5 2 dB 4 dB 8 dB 16 dB Condition J1-J2 Insertion Loss 2 dB State 4 dB State 8 dB State 16 dB State 30 dB Max. Atten.
V5 V4 V3 V2 V1
2
Alpha Industries, Inc. [781] 935-5150 * Fax [978] 241-7906 * Email sales@alphaind.com * www.alphaind.com
Specifications subject to change without notice. 9/01A


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