ALPHA AT002D4-31

GaAs 4 Bit Digital Attenuator
2, 4, 8, 16 dB Bits DC–2 GHz
AT002D4-31
Features
-31
■ Low DC Power Consumption
■ Attenuation in 2 dB Steps to 30 dB with
High Accuracy
ORIENTATION
MARK
0.270 (6.86 mm) MAX.
0.050 (1.27 mm)
0.395 (10.03 mm)
MAX.
■ 14 Lead Hermetic Surface Mount Package
■ Capable of Meeting MIL-STD
Requirements6
0.017 (0.43 mm)
0.500 (12.70 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.
0.006 (0.15 mm)
0.004 (0.10 mm)
0.070 (1.78 mm)
0.040 (1.02 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 25°C
Parameter1
Frequency5
Insertion Loss2
DC–0.5 GHz
DC–1.0 GHz
DC–2.0 GHz
Attenuation Range3
DC–1.0 GHz
DC–2.0 GHz
Attenuation Accuracy Per Bit
DC–1.0 GHz
DC–2.0 GHz
VSWR
Min.
28
26
Typ.
Max.
Unit
2.6
3.3
5.0
3.0
3.9
5.8
dB
dB
dB
30
30
dB
dB
± (0.4 + 5% of Attenuation
Setting in dB)
± (0.5 + 5% of Attenuation
Setting in dB)
DC–0.5 GHz
DC–2.0 GHz
1.3:1
1.6:1
1.5:1
1.8:1
Typ.
Max.
Operating Characteristics at 25°C
Parameter
Switching Characteristics
Condition
Frequency
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru4
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
For Two-tone Input Power 13 dBm
Control Voltages
VLow = 0 to -0.2 V @ 20 µA Max.
VHigh = -5 V @ 50 µA to -9 V @ 200 µA Max.
1. All measurements made in a 50 Ω system, unless otherwise specified.
2. Insertion loss changes by 0.003 dB/°C.
3. Attenuation value referenced above insertion loss.
Min.
Unit
7
14
20
ns
ns
mV
0.5–2 GHz
27
dBm
0.5–2 GHz
0.001–0.5 GHz
43
32
dBm
dBm
4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
5. DC = 300 kHz.
6. See Quality/Reliability section.
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
30
30 dB ± 1.0
+85˚C
20
2.5
Attenuation (dB)
Insertion Loss (dB)
3.0
-55˚C
2.0
16 dB ± 0.6
15
10
8 dB ± 0.4
5
4 dB ± 0.4
0
2 dB ± 0.3
1.5
1.0
DC
0.2
0.4
0.6
0.8
1.0
2.0
DC
0.2
0.4
0.6
0.8
1.0
Frequency (GHz)
Insertion Loss vs. Frequency
Attenuation vs. Frequency by BIT
Absolute Maximum Ratings
2.5
Characteristic
2.2
RF Input Power (RF In)
1.9
Control Voltage (VC)
1.6
1.3
Value
2 W > 500 MHz 0/-8 V
0.5 W @ 50 MHz 0/-8 V
+0.2 V, -10 V
Operating Temperature (TOP)
-55°C to +125°C
Storage Temperature (TST)
-65°C to +150°C
Thermal Resistance (ΘJC)
25°C/W
1.0
DC
0.2
0.4
0.6
0.8
1.0
3.0
Pin Out
Frequency (GHz)
VSWR vs. Frequency (All States)
Truth Table
V1
V2
V3
2 dB
2
2.0
Frequency (GHz)
V4
V5
4 dB
V6
V7
8 dB
V8
16 dB
Condition
J1–J2
-5
0
-5
0
0
-5
-5
0
Insertion Loss
0
-5
-5
0
0
-5
-5
0
2 dB State
-5
0
0
-5
0
-5
-5
0
4 dB State
-5
0
-5
0
-5
0
-5
0
8 dB State
-5
0
-5
0
0
-5
0
-5
16 dB State
0
-5
0
-5
-5
0
0
-5
30 dB Max. Atten.
V7
V8
V6
GND
V5
J1
V4
GND
V3
GND
V2
GND
V1
J2
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