Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579
Email sales@alphaind.com
www.alphaind.com
1
Specifications subject to change without notice. 10/98A
GaAs IC 4 Bit Digital Attenuator
2 dB LSB DC1 GHz
Features
s
2, 4, 8, 16 dB Bits
s
Designed for Cellular Radio Applications
s
Low Cost Plastic Package
s
For Extended Frequency Performance to
2 GHz Use the AD320-25
s
Low DC Power Consumption
SOIC-16
AT001D4-25
Description
The AT001D4-25 is an IC FET digital attenuator consisting
of four monolithic attenuators with LSB of 2 dB and a total
attenuation of 30 dB with all attenuators connected.
The attenuator is packaged in the plastic 16 lead surface
mount package for low cost commercial cellular radio
applications.
Bias required is -5, 0 V. By "floating" the device, a bias of
+ 5 and 0 is required. Refer to the application note, "Switch
and Attenuator Mounting for Positive Voltage Operation,"
in the Application Notes section.
Electrical Specifications at 25C (0, -5 V)
Parameter
1
Frequency
2
Min.
Typ.
Max.
Unit
Insertion Loss
3
DC0.5 GHz
3.0
3.8
dB
DC1.0 GHz
3.7
4.0
dB
Attenuation Range
4
DC1.0 GHz
10% of Attenuation Setting
dB
in dB or 0.5 dB,
Whichever is Greater
VSWR (I/O)
DC0.5 GHz
1.45
1.8:1
DC1.0 GHz
1.5
1.8:1
0.158 (4.00 mm)
0.150 (3.80 mm)
0.068
(1.73 mm) MAX.
0.244 (6.20 mm)
0.228 (5.80 mm)
0.049 (1.24 mm)
0.016 (0.41 mm)
0.016 MAX.
(0.41 mm)
x 45
CHAMFER
0.020 (0.51 mm)
0.013 (0.33 mm)
0.050
(1.27 mm) BSC
PIN 16
PIN 1
PIN 1
INDICATOR
0.394 (10.00 mm)
0.386 (9.80 mm)
0.010 (0.25 mm)
0.004 (0.10 mm)
0.0098 (0.25 mm)
0.0075 (0.19 mm)
8 MAX.
Parameter
Condition
Frequency
Min.
Typ.
Max.
Unit
Switching Characteristics
5
Rise, Fall (10/90% or 90/10% RF)
10
ns
On, Off (50% CTL to 90/10% RF)
20
ns
Video Feedthru
20
mV
Input Power for 1 dB Compression
0.51.0 GHz
+24
dBm
0.001 GHz
+14
dBm
Intermodulation Intercept Point (IP3)
For Two-tone Input Power +13 dBm
0.51.0 GHz
+43
dBm
0.001 GHz
+32
dBm
Control Voltages
V
Low
= 0 to -0.2 V @ 20 A Max.
V
High
= -5 @ 50 A to -8 V @ 200 A Max.
Operating Characteristics at 25C (0, -5 V)
1. All measurements made in a 50
system, unless otherwise specified.
2. DC = 300 kHz.
3. Insertion loss changes by 0.003 dB/C.
4. Attenuation referenced to insertion loss.
5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
2
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579
Email sales@alphaind.com
www.alphaind.com
Specifications subject to change without notice. 10/98A
GaAs IC 4 Bit Digital Attenuator 2 dB LSB DC1 GHz
AT001D4-25
2 dB
4 dB
8 dB
16 dB
J
1
J
2
V
1
V
2
V
3
V
4
V
5
V
6
V
7
V
8
Attenuation
-5
0
-5
0
0
-5
-5
0
Reference I.L.
0
-5
-5
0
0
-5
-5
0
2 dB
-5
0
0
-5
0
-5
-5
0
4 dB
-5
0
-5
0
-5
0
-5
0
8 dB
-5
0
-5
0
0
-5
0
-5
16 dB
0
-5
0
-5
-5
0
0
-5
30 dB Max.
Truth Table
5
4
3
2
1
DC
0.4
0.8
1.2
Frequency (GHz)
Insertion Loss vs. Frequency
d
B
0
+85C
-40C
DC
0.4
0.8
1.2
Frequency (GHz)
d
B
2 Through 14 dB States vs. Frequency
15
12
9
6
3
0
DC
0.4
0.8
1.2
Frequency (GHz)
d
B
VSWR vs. Frequency (All States)
2.5
2.2
1.9
1.6
1.3
1.0
DC
0.4
0.8
1.2
Frequency (GHz)
d
B
16 Through 30 dB States vs. Frequency
30
27
24
21
18
15
Typical Performance Data (0, -5 V)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
8
16 dB
8 dB
4 dB
2 dB
V
7
V
6
V
5
V
4
V
3
V
2
V
1
J
1
GND GND GND GND GND GND J
2
Characteristic
Value
RF Input Power
2 W > 500 MHz 0/-8 V
0.5 W @ 50 MHz 0/-8 V
Control Voltage
+0.2 V, -8 V
Operating Temperature
-40C to 85C
Storage Temperature
-65C to 150C
JC
25C/W
Absolute Maximum Ratings
Note: Exceeding these parameters may cause irreversible damage.
Pin Out
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