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
2 dB LSB Positive Control 0.5–2 GHz
Features
■ Attenuation 2 dB Steps to 30 dB
with High Accuracy
■ Single Positive Control for Each Bit
■ Low DC Power Consumption
■ Small Low Cost TSSOP-16 Plastic
Package
TSSOP-16
AA264-87
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 AA264-87 is a 4 bit, single positive control GaAs IC
FET digital attenuator in a low cost TSSOP-16 pac kage.
The attenuator requires external DC blocking capacitors ,
positive supply voltage (VS) and four individual positive
control voltages (V1–V4). 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.
Parameter
1
Condition Frequency Min. Typ. Max. Unit
Insertion Loss 0.5–1.0 GHz 1.6 2.0 dB
0.5–2.0 GHz 1.8 2.4 dB
Attenuation Range 30 dB
Attenuation Accuracy
2
0.5–1.0 GHz ± (0.2 + 3% of
Attenuation Setting in dB) dB
0.5–2.0 GHz ± (0.3 + 5% of
2–24 dB Setting) dB
0.5–2.0 GHz ± (0.3 + 6% of
26–30 dB Setting) dB
VSWR (I/O)
3
0.5–0.8 GHz 1.8:1 2.2:1
0.8–2.0 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 V
S
= +3 V 0.5–2.0 GHz +15 +21 dBm
VS= +5 V 0.5–2.0 GHz +21 +27 dBm
Intermodulation Intercept Point (IP3) For Two-tone Input Power +5 dBm
V
S
= +3 V 0.5–2.0 GHz +36 +44 dBm
VS= +5 V 0.5–2.0 GHz +37 +45 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.
V
S
= 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 2 dB LSB Positive Control 0.5–2 GHz AA264-87
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
IP3 (dBm)
Attenuation (dB)
IP3 vs. Attenuation and
Temperature (500 MHz)
35
40
45
50
55
60
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
+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)
1.0
1.2
1.4
1.6
1.8
2.0
2.2
Ins. Loss
2 dB
4 dB
8 dB
16 dB
30 dB
Ins. Loss
2 dB
4 dB
8 dB
16 dB
30 dB
VSWR vs. Frequency (85˚C)
VSWR
0 0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
1.0
1.2
1.4
1.6
1.8
2.0
2.2
VSWR
Frequency (GHz)
VSWR vs. Frequency (-40˚C)
0 0.5 1.0 1.5 2.0 2.5 3.0
1.0
1.2
1.4
1.6
1.8
2.0
2.2
Ins. Loss
2 dB
4 dB
8 dB
16 dB
30 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 29.0 28.9 29.0
2 dB 5 28.3 28.1 28.1
4 dB 5 35.2 34.7 35.0
8 dB 5 25.8 25.3 25.4
16 dB 5 21.7 21.3 21.6
30 dB 5 24.4 23.2 27.2
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 2 dB LSB Positive Control 0.5–2 GHz AA264-87
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)
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
2 dB
4 dB
8 dB
16 dB
30 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)
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
2 dB
4 dB
8 dB
16 dB
30 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)
-15
-5
5
15
25
35
45
55
65
75
85
2 dB
4 dB
8 dB
16 dB
30 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)
-15
-5
5
15
25
35
45
55
65
75
85
2 dB
4 dB
8 dB
16 dB
30 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)
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
2 dB
4 dB
8 dB
16 dB
30 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)
-15
-5
5
15
25
35
45
55
65
75
85
2 dB
4 dB
8 dB
16 dB
30 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 2 dB LSB Positive Control 0.5–2 GHz AA264-87
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)
Ins. Loss
2 dB
4 dB
8 dB
16 dB
30 dB
1.0
1.2
1.4
1.6
1.8
2.0
2.2
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (25˚C)
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
2 dB
4 dB
8 dB
16 dB
30 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
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)
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
2 dB
4 dB
8 dB
16 dB
30 dB
0 0.5 1.0 1.5 2.0 2.5 3.0
Deviation from Nominal
Insertion Phase (dB)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (25˚C)
-10
0
10
20
30
40
50
60
70
80
90
2 dB
4 dB
6 dB
8 dB
30 dB
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (-40˚C)
0 0.5 1.0 1.5 2.0 2.5 3.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
2 dB
4 dB
8 dB
16 dB
30 dB
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 2 dB LSB Positive Control 0.5–2 GHz AA264-87
Truth Table
V
1
V
2
V
3
V
4
Attenuation
16 dB 8 dB 4 dB 2 dB J1–J
2
V
High
V
High
V
High
V
High
Reference I.L.
V
High
V
High
V
High
02 dB
V
High
V
High
0V
High
4 dB
V
High
0V
High
V
High
8 dB
0V
High
V
High
V
High
16 dB
0 0 0 0 30 dB Max. Atten.
V
High
= +3 to +5 V (VS= V
High
± 0.2 V).
123456 8
16 15 14 13 12 11 9
7
10
16 dB
8 dB
4 dB
2 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
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.
IP3 (dBm)
Attenuation (dB)
IP3 vs. Attenuation and
Temperature (500 MHz)
0 2 4 6 8 1012141618202224262830
37
39
41
43
45
47
49
51
53
55
57
+25˚C
+85˚C
-40˚C
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 3 21.7 21.6 22.6
2 dB 3 21.2 20.7 21.4
4 dB 3 34.3 31.0 34.3
8 dB 3 33.6 23.0 32.9
16 dB 3 18.0 17.0 21.4
30 dB 3 22.4 21.2 24.1
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