GaAs IC 4 Bit Digital Attenuator
1 dB LSB Positive Control 0.5–2.5 GHz
AA226-87
Features
s
Attenuation 1 dB Steps to 15 dB
with High Accuracy
s
Single Positive Control (+3 to +5 V) for
Each Bit
s
Low DC Power Consumption
s
Small Low Cost TSSOP-16 Plastic
Package
TSSOP-16
PIN 16
0.173 (4.40 mm)
± 0.004 (0.10 mm)
PIN 1
INDICATOR
PIN 1
0.197 (5.00 mm)
± 0.004 (0.10 mm)
0.047 (1.20 mm)
MAX.
0.252 (6.4 mm)
BSC
0.0256 (0.65 mm)
BSC
R 0.004 (0.09 mm)
MIN.
Description
The AA226-87 is a 4 bit, single positive control GaAs IC
FET digital attenuator. It requires DC blocking capacitors,
positive supply voltage (V
S
) and four individual positive bit
control voltages (V
1
–V
4
). The AA226-87 is particularly
suited where high attenuation accuracy, low insertion loss
and low intermodulation products are required. Typical
applications include base station, wireless data and
wireless local loop gain control circuits.
0.009 (0.22 mm) REF.
0.035 (0.90 mm)
+ 0.006 (0.15 mm) /
-0.004 (-0.10 mm)
0.006 (0.15 mm) MAX.
0.002 (0.05 mm) MIN.
0.024
(0.60 mm)
± 0.006
(0.15 mm)
Electrical Specifications at -40°C to +85°C (0, +5 V)
Parameter
1
Insertion Loss
Condition
Frequency
0.5–1.0 GHz
1.0–2.0 GHz
2.0–2.5 GHz
0.5–1.0 GHz
1.0–2.5 GHz
VSWR
(I/O)
3
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
V
S
= +3 V
V
S
= +5 V
For Two-tone Input Power +5 dBm
V
S
= +3 V
V
S
= +5 V
0.5–2.5 GHz
0.5–2.5 GHz
0.5–2.5 GHz
0.5–2.5 GHz
+20
+24
+43
+44
0.5–2.5 GHz
Min.
Typ.
1.3
1.7
2.3
15
± (0.2 + 3% of
Attenuation Setting in dB)
± (0.3 + 4% of
Attenuation Setting in dB)
1.5:1
150
300
70
+25
+30
+49
+50
2.0:1
ns
ns
mV
dBm
dBm
dBm
dBm
Max.
1.7
2.2
2.6
Unit
dB
dB
dB
dB
dB
dB
Attenuation Range
Attenuation
Accuracy
2
Switching Characteristics
4
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
V
Low
= 0 to 0.2 V @ 20 µA Max.
V
High
= +3 V @ 100 µA Max. to +5 V @ 200 µA Max.
V
S
= V
High
± 0.2 V
3. Input/output.
4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
1. All measurements made in a 50
Ω
system, unless otherwise specified.
2. Attenuation referenced to insertion loss.
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 9/00A
1
ALPHA [ ALPHA INDUSTRIES ]
