Page 1
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com 1
Specifications subject to change without notice. 9/00A
GaAs IC 4 Bit Digital Attenuator
1 dB LSB Positive Control 0.5–2.5 GHz
Features
■ Attenuation 1 dB Steps to 15 dB
with High Accuracy
■ Single Positive Control (+3 to +5 V) for
Each Bit
■ Low DC Power Consumption
■ Small Low Cost TSSOP-16 Plastic
Package
TSSOP-16
AA226-87
0.173 (4.40 mm)
± 0.004 (0.10 mm)
0.197 (5.00 mm)
± 0.004 (0.10 mm)
0.252 (6.4 mm)
BSC
PIN 16
PIN 1
INDICATOR
PIN 1
0.006 (0.15 mm) MAX.
0.002 (0.05 mm) MIN.
0.047 (1.20 mm)
MAX.
0.035 (0.90 mm)
+ 0.006 (0.15 mm) /
-0.004 (-0.10 mm)
0.0256 (0.65 mm)
BSC
0.009 (0.22 mm) REF.
R 0.004 (0.09 mm)
MIN.
0.024
(0.60 mm)
± 0.006
(0.15 mm)
Description
The AA226-87 is a 4 bit, single positive control GaAs IC
FET digital attenuator.It requires DC blocking capacitors,
positive supply voltage (VS) 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.
Parameter
1
Condition Frequency Min. Typ. Max. Unit
Insertion Loss 0.5–1.0 GHz 1.3 1.7 dB
1.0–2.0 GHz 1.7 2.2 dB
2.0–2.5 GHz 2.3 2.6 dB
Attenuation Range 15 dB
Attenuation Accuracy
2
0.5–1.0 GHz ± (0.2 + 3% of
Attenuation Setting in dB) dB
1.0–2.5 GHz ± (0.3 + 4% of
Attenuation Setting in dB) dB
VSWR (I/O)
3
0.5–2.5 GHz 1.5:1 2.0:1
Switching Characteristics
4
Rise, Fall (10/90% or 90/10% RF) 150 ns
On, Off (50% CTL to 90/10% RF) 300 ns
Video Feedthru 70 mV
Input Power for 1 dB Compression VS= +3 V 0.5–2.5 GHz +20 +25 dBm
VS= +5 V 0.5–2.5 GHz +24 +30 dBm
Intermodulation Intercept Point (IP3) For Two-tone Input Power +5 dBm
VS= +3 V 0.5–2.5 GHz +43 +49 dBm
VS= +5 V 0.5–2.5 GHz +44 +50 dBm
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.
VS= V
High
± 0.2 V
Electrical Specifications at -40°C to +85°C (0, +5 V)
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.
Page 2
2 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
GaAs IC 4 Bit Digital Attenuator 1 dB LSB Positive Control 0.5–2.5 GHz AA226-87
Insertion Loss (dB)
Frequency (GHz)
Insertion Loss vs. Frequency
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0 0.5 1.0 1.5 2.0 2.5 3.0
+85˚C
-40˚C
+25˚C
IP3 (dBm)
Attenuation (dB)
IP3 vs. Attenuation and
Temperature (500 MHz)
44
46
48
50
56
52
58
54
60
0123456789101112131415
+25˚C
+85˚C
-40˚C
VSWR vs. Frequency (25˚C)
VSWR
0 0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
1.00
1.25
1.50
1.75
2.00
2.25
2.50
Ins. Loss
1 dB
2 dB
4 dB
8 dB
15 dB
VSWR
Frequency (GHz)
VSWR vs. Frequency (85˚C)
1.00
1.25
1.50
1.75
2.00
2.25
2.50
0 0.5 1.0 1.5 2.0 2.5 3.0
Ins. Loss
1 dB
2 dB
4 dB
8 dB
15 dB
VSWR
Frequency (GHz)
VSWR vs. Frequency (-40˚C)
1.00
1.25
1.50
1.75
2.00
2.25
2.50
0 0.5 1.0 1.5 2.0 2.5 3.0
Ins. Loss
1 dB
2 dB
4 dB
8 dB
15 dB
Typical Performance Data (0, +5 V)
Compression Point vs. Attenuation,
Voltage, and Temperature
Attenuation Control
Input Power @ 1 dB Compression
State Voltage (V)+25°C (dBm) +85°C (dBm) -40°C (dBm)
Ins. Loss 5 31.6 31.0 30.8
1 dB 5 31.9 31.5 31.2
2 dB 5 31.4 31.1 30.9
4 dB 5 32.7 31.5 34.8
8 dB 5 33.0 32.8 33.5
15 dB 5 30.7 28.5 31.7
Page 3
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com 3
Specifications subject to change without notice. 9/00A
GaAs IC 4 Bit Digital Attenuator 1 dB LSB Positive Control 0.5–2.5 GHz AA226-87
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (25˚C)
-1.00
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
1 dB
2 dB
4 dB
8 dB
15 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (85˚C)
-1.00
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
1 dB
2 dB
4 dB
8 dB
15 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Insertion Phase (Deg.)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (25˚C)
-10
-5
0
5
10
15
20
25
30
1 dB 2 dB
4 dB
8 dB
15 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Insertion Phase (Deg.)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (85˚C)
-10
-5
0
5
10
15
20
25
30
1 dB2 dB4 dB
8 dB
15 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (-40˚C)
-1.00
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
1 dB2 dB
4 dB
8 dB
15 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Insertion Phase (Deg.)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (-40˚C)
-10
-5
0
5
10
15
20
25
30
1 dB
2 dB
4 dB
8 dB
15 dB
Page 4
4 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
GaAs IC 4 Bit Digital Attenuator 1 dB LSB Positive Control 0.5–2.5 GHz AA226-87
Insertion Loss (dB)
Frequency (GHz)
Insertion Loss vs. Frequency
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0 0.5 1.0 1.5 2.0 2.5 3.0
+25˚C
+85˚C
-40˚C
VSWR vs. Frequency (25˚C)
VSWR
0 0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
1.00
1.25
1.50
1.75
2.00
2.25
2.50
Ins. Loss
1 dB
2 dB
4 dB
8 dB
15 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (25˚C)
-1.00
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
1 dB
2 dB
4 dB
8 dB
15 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (85˚C)
-1.25
-1.00
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
1 dB
2 dB
4 dB
8 dB
15 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Phase (Deg.)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (25˚C)
-10
-5
0
5
10
15
20
25
30
1 dB
2 dB
4 dB
8 dB
15 dB
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (-40˚C)
-1.00
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
1 dB
2 dB
4 dB
8 dB
15 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Typical Performance Data (0, +3 V)
Page 5
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com 5
Specifications subject to change without notice. 9/00A
GaAs IC 4 Bit Digital Attenuator 1 dB LSB Positive Control 0.5–2.5 GHz AA226-87
IP3 (dBm)
Attenuation (dB)
IP3 vs. Attenuation and
Temperature (500 MHz)
0123456789101112131415
46
47
48
49
50
51
52
53
54
55
56
+25˚C
+85˚C
-40˚C
Compression Point vs. Attenuation,
Voltage, and Temperature
Truth Table
V
1
V
2
V
3
V
4
Attenuation
8 dB 4 dB 2 dB 1 dB J1–J
2
V
High
V
High
V
High
V
High
Reference I.L.
V
High
V
High
V
High
01 dB
V
High
V
High
0V
High
2 dB
V
High
0V
High
V
High
4 dB
0V
High
V
High
V
High
8 dB
0 0 0 0 15 dB Max. Atten.
123456 8
16 15 14 13 12 11 9
7
10
8 dB
4 dB
2 dB
1 dB
GND
V
4
V
3
V
2
J
1
GND
GND
GND
GND
GND
GND
GND
GND
GND
V
1
J
2
C
BL
C
BL
V
S
10 kΩ
Pin Out
V
High
= +3 to +5 V (VS= V
High
± 0.2 V).
Characteristic Value
RF Input Power 1 W > 500 MHz 0/8 V
0.5 W @ 50 MHz 0/8 V
Supply Voltage +8 V
Control Voltage -0.2 V, +8 V
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +150°C
Absolute Maximum Ratings
Note: Exceeding these parameters may cause irreversible damage.
DC blocking capacitors (C
BL
) and biasing resistor must be supplied externally
for positive voltage operation.
C
BL
= 47 pF for operation >500 MHz.
Attenuation Control
Input Power @ 1 dB Compression
State Voltage (V)+25°C (dBm) +85°C (dBm) -40°C (dBm)
Ins. Loss 3 24.5 24.1 24.6
1 dB 3 25.2 24.8 25.2
2 dB 3 25.0 24.3 24.9
4 dB 3 31.2 30.4 32.8
8 dB 3 28.3 26.3 29.2
15 dB 3 26.6 24.8 27.5
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