AA226-87 Datasheet, PDF (1/5 Pages) Alpha Industries – GaAs IC 4 Bit Digital Attenuator 1 dB LSB Positive Control 0.5-2.5 GHz

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)
0.252 (6.4 mm)
BSC
PIN 1
INDICATOR
PIN 1
0.197 (5.00 mm)
± 0.004 (0.10 mm)
0.0256 (0.65 mm) 0.047 (1.20 mm)
BSC
MAX.
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 (V₁–V₄). 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)
Parameter¹
Condition
Frequency
Min.
Typ. Max. Unit
Insertion Loss
0.5–1.0 GHz
1.0–2.0 GHz
2.0–2.5 GHz
1.3
1.7
dB
1.7
2.2
dB
2.3
2.6
dB
Attenuation Range
Attenuation Accuracy²
0.5–1.0 GHz
1.0–2.5 GHz
15
dB
± (0.2 + 3% of
Attenuation Setting in dB) dB
± (0.3 + 4% of
Attenuation Setting in dB) dB
VSWR (I/O)³
Switching Characteristics⁴
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
0.5–2.5 GHz
1.5:1 2.0:1
150
ns
300
ns
70
mV
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
V_S = +3 V
V_S = +5 V
0.5–2.5 GHz
0.5–2.5 GHz
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
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
+20
+25
+24
+30
+43
+49
+44
+50
dBm
dBm
dBm
dBm
1. All measurements made in a 50 Ω system, unless otherwise specified.
2. Attenuation referenced to insertion loss.
3. Input/output.
4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com
1
Specifications subject to change without notice. 9/00A