Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579
Email sales@alphaind.com
www.alphaind.com
1
Specifications subject to change without notice. 2/01A
GaAs IC 5 Bit Digital Attenuator with Driver
1 dB LSB Positive Control DC2 GHz
Features
s
Attenuation 1 dB Steps to 31 dB With
High Accuracy
s
Single Positive Control (+5 V) for Each Bit
s
Low DC Power Consumption
s
CMOS Integrated Silicon Driver
s
Designed for Use at IF Frequencies
SSOP-20
AA110-85
0.012
(0.30 mm)
REF.
0.0256
(0.65 mm)
BSC
0.069
(1.75 mm)
0.004
(0.10 mm)
0.008 (0.20 mm) MAX.
0.002 (0.05 mm) MIN.
0.010 (0.25 mm)
0.004 (0.090 mm)
8 MAX.
0.030 (0.75 mm)
0.008 (0.10 mm)
0.078
(2.00 mm)
MAX.
0.283 (7.20 mm)
0.012 (0.30 mm)
PIN 20
PIN 1
0.209 (5.30 mm)
0.012 (0.30 mm)
0.307 (7.80 mm)
0.016 (0.307 mm)
PIN 1
INDICATOR
Description
The AA110-85 is a 5 bit, single positive control GaAs IC
FET digital attenuator with driver. It is particularly suited
at IF frequencies where high attenuation accuracy, low
insertion loss and low intermodulation products are
required. Typical applications include base station,
wireless data, broadband and wireless local loop gain
control circuits.
Parameter
1
Frequency
Min.
Typ.
Max.
Unit
Insertion Loss
2
DC0.5 GHz
1.4
1.7
dB
DC1.0 GHz
1.7
2.1
dB
DC2.0 GHz
2.2
2.6
dB
Attenuation Range
31
dB
Attenuation Accuracy
3
DC0.5 GHz
(0.2 + 2% of
Attenuation Setting in dB)
dB
DC1.0 GHz
(0.25 + 3% of
Attenuation Setting in dB)
dB
DC2.0 GHz
(0.4 + 6% of
Attenuation Setting in dB)
dB
VSWR (I/O)
4
DC2.0 GHz
1.5:1
1.8:1
Electrical Specifications at 25C (0, +5 V)
Preliminary
Parameter
Condition
Frequency
Min.
Typ.
Max.
Unit
Switching Characteristics
5
Rise, Fall (10/90% or 90/10% RF)
30
ns
On, Off (50% CTL to 90/10% RF)
50
ns
Video Feedthru
50
mV
Input Power for 1 dB Compression
V
CC
= +5 V
0.52.0 GHz
+25
+29
dBm
0.05 GHz
+18
+22
dBm
Intermodulation Intercept Point (IP3)
For Two-tone Input Power +5 dBm
0.52.0 GHz
+42
+48
dBm
V
CC
= +5 V
0.05 GHz
+30
+36
dBm
Supply Voltage
V
CC
= 5 V @ 700 A Typ.
Control Voltages
C
TL1
, C
TL2
, C
TL4
, C
TL8
, C
TL16
,
Low
= 0 to 0.8 V @ 20 A Typ.
C
TL1
, C
TL2
, C
TL4
, C
TL8
, C
TL16
,
High
= 3.5 to 5.0 V @ 20 A Typ.
Operating Characteristics at 25C (0, +5 V)
1. All measurements made in a 50
system, unless otherwise specified.
2. Insertion loss changes by 0.003 dB/C.
3. Attenuation referenced to insertion loss.
4. Input/output.
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. 2/01A
GaAs IC 5 Bit Digital Attenuator with Driver 1 dB LSB Positive Control DC2 GHz
AA110-85
J
1
GND
GND
GND
GND
GND
GND
GND
GND
J
2
N/C
V
CC
V
SS
C
TL1
C
TL2
C
TL4
C
TL8
C
TL16
0.01
F
(Negative Voltage
Holding Capacitor)
(Power Supply
Bypass Capacitor)
(Charge Pump Capacitor)
0.01
F
0.025
F
C
2
C
1
12
3
4
5
6
7
8
20
19
18
17
16
15
14
13
91
0
12
11
Pin Out
"0" = 0 to 0.8 V (V
CC
= 5 V).
"1" = 3.5 to 5 V (V
CC
= 5 V).
Attenuation
C
TL1
C
TL2
C
TL4
C
TL8
C
TL16
J
1
J
2
0
0
0
0
0
Ins. Loss
1
0
0
0
0
1 dB
0
1
0
0
0
2 dB
0
0
1
0
0
4 dB
0
0
0
1
0
8 dB
0
0
0
0
1
16 dB
1
1
1
1
1
31 dB
Truth Table
Typical Performance Data (V
CC
= +5 V)
Frequency (GHz)
Insertion Loss vs. Frequency
-2.2
-2.0
-1.8
-1.6
-1.4
-1.2
-1.0
0
0.5
1.0
1.5
2.0
Insertion Loss (dB)
Frequency (GHz)
Attenuation Accuracy vs. Frequency
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
0
0.5
1.0
1.5
2.0
Deviation from Nominal
Attenuation (dB)
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
Frequency (GHz)
VSWR vs. Frequency
VSWR
1.0
1.2
1.4
1.6
1.8
2.0
0
0.5
1.0
1.5
2.0
Ins. Loss
1 dB 2 dB
4 dB
8 dB
16 dB
31 dB
Characteristic
Value
RF Input Power
2 W > 500 MHz, 0/6 V
0.5 W > 50 MHz, 0/6 V
Supply Voltage
6 V
Control Voltage
1
-0.2 V, +6 V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +150C
JC
85C/W
Absolute Maximum Ratings
Note: Exceeding these ratings may cause irreversible damage.
1. Control voltage must not exceed supply voltage.
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