GaAs IC 4 Bit Digital Attenuator
2 dB LSB Positive Control 0.5–2 GHz
AA264-87
Features
s
Attenuation 2 dB Steps to 30 dB
with High Accuracy
s
Single Positive Control 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 AA264-87 is a 4 bit, single positive control GaAs IC
FET digital attenuator in a low cost TSSOP-16 package.
The attenuator requires external DC blocking capacitors,
positive supply voltage (V
S
) and four individual positive
control voltages (V
1
–V
4
). The AA264-87 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
Attenuation Range
Attenuation Accuracy
2
0.5–1.0 GHz
0.5–2.0 GHz
0.5–2.0 GHz
VSWR (I/O)
3
Switching Characteristics
4
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
0.5–2.0 GHz
0.5–2.0 GHz
0.5–2.0 GHz
0.5–2.0 GHz
+15
+21
+36
+37
0.5–0.8 GHz
0.8–2.0 GHz
Condition
Frequency
0.5–1.0 GHz
0.5–2.0 GHz
Min.
Typ.
1.6
1.8
30
± (0.2 + 3% of
Attenuation Setting in dB)
± (0.3 + 5% of
2–24 dB Setting)
± (0.3 + 6% of
26–30 dB Setting)
1.8:1
1.5:1
150
300
70
+21
+27
+44
+45
2.2:1
2.0:1
ns
ns
mV
dBm
dBm
dBm
dBm
Max.
2.0
2.4
Unit
dB
dB
dB
dB
dB
dB
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 ]
