GaAs IC 4 Bit Digital Attenuator With
Driver 1, 2, 4, 8 dB Bits DC–2 GHz
AK402D4-31
Features
s
Integral Driver ±5 V Supply Voltages
s
Attenuation in 1 dB Steps to 15 dB with
High Accuracy
s
14 Lead Hermetic Surface Mount Package
s
Capable of Meeting MIL-STD
Requirements
8
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 AK402D4-31 is an MMIC FET digital attenuator
consisting of four monolithic attenuators with an LSB of
1 dB and a total attenuation of 15 dB with all attenuators
connected. Bias required is +5 and -5 V. This attenuator
is designed for both commercial and high reliability
applications.
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 25°C
Parameter
1
Insertion Loss
2
Frequency
7
DC–0.5 GHz
DC–1.0 GHz
DC–2.0 GHz
DC–2.0 GHz
DC–2.0 GHz
13.8
Min.
Typ.
Max.
2.0
3.0
3.8
16.0
Unit
dB
dB
dB
dB
Attenuation Range
3
Attenuation Accuracy Per Bit
± (0.5% 8 dB Bit Max.)
± (10% 1, 2, 4 dB Bits Max.)
or ± (0.4 dB Whichever is Greater)
1.3:1
1.5:1
VSWR
DC–0.5 GHz
DC–2.0 GHz
Operating Characteristics at 25°C
Parameter
Switching Characteristics
Condition
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
4
0.5–2 GHz
0.001 GHz
For Two-tone Input Power 13 dBm
V
Low
V
High
+5 V @ 3 mA Typ.
-5 V @ 16 mA Typ.
0.5–2 GHz
0.001–0.5 GHz
20
12
34
27
0
4
+4.75
-4.75
6. Current increases from 16 mA to 20 mA @ 85°C.
7. DC = 300 kHz.
8. See Quality/Reliability section.
Frequency
Min.
Typ.
10
20
30
24
16
37
26
Max.
20
40
40
Unit
ns
ns
mV
dBm
dBm
dBm
dBm
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
Supply Voltages
5,6
0.5
5.5
+5.25
-5.25
V
V
V
V
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.
4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
5. Bias voltage and ground must be connected before TTL voltage is applied.
To avoid voltage sequencing refer to the Application Note section, “Driver
Protection Circuit.”
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 3/99A
1
GaAs IC 4 Bit Digital Attenuator With Driver 1, 2, 4, 8 dB Bits DC–2 GHz
AK402D4-31
Typical Performance Data
4.0
3.5
3.0
+85˚C
2.5
-55˚C
2.0
1.5
DC
1
2
5
4 dB ± 0.3
4
Insertion Loss (dB)
Attenuation (dB)
3
2 dB ± 0.2
2
1 dB ± 0.2
1
0
DC
1
2
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
Attenuation 1, 2, 4 dB Bits
15
15 dB ± 0.8
14
Absolute Maximum Ratings
Characteristic
RF Input Power (RF In)
Value
0.8 W > 500 MHz
0.2 W @ 50 MHz
+6 V, -6 V
-0.2 V, +6 V
-40°C to +90°C
-65°C to +150°C
30°C/W
Attenuation (dB)
13
9
8 dB ± 0.3
8
7
DC
1
2
Bias Voltage (V
B
)
Control Voltage (V
C
)
Operating Temperature (T
OP
)
Storage Temperature (T
ST
)
Thermal Resistance (Θ
JC
)
Frequency (GHz)
Pin Out
J
1
-5 V
GND
C
4
C
2
C
3
C
1
+5 V
GND
GND
Attenuation 8, 15 dB Bits
Truth Table
C
1
8 dB
0
0
0
0
1
1
C
2
2 dB
0
0
1
0
0
1
C
3
4 dB
0
0
0
1
0
1
C
4
1 dB
0
1
0
0
0
1
State
J
1
–J
2
IL
1 dB
2 dB
4 dB
8 dB
15 dB
GND
GND
GND
J
2
2
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 3/99A
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