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 0.5–3.0 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
■ Miniature Low Cost MSOP-10
Plastic Package
MSOP-10
AA105-86
PIN 10
PIN 1
PIN 1
INDICATOR
0.034
(0.86 mm)
± 0.004
(0.10 mm)
0.118 (3.00 mm)
± 0.006 (0.15 mm)
0.193
(4.90 mm)
± 0.006
(0.15 mm)
0˚–6˚
8˚–16˚
0.118 (3.00 mm)
± 0.006 (0.15 mm)
0.022 (0.55 mm)
± 0.006 (0.15 mm)
0.006 (0.15 mm) MAX.
0.002 (0.05 mm) MIN.
0.0197
(0.500 mm)
BSC
0.009 (0.23 mm)
REF.
0.043
(1.09 mm)
MAX.
Description
The AA105-86 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 AA105-86 is particularly
suited where high attenuation accuracy, low insertion loss
and low intermodulation products are required. Typical
applications include cellular radio, wireless data, and
wireless local loop gain level control circuits.
Parameter
1
Condition Frequency Min. Typ. Max. Unit
Insertion Loss 0.5–1.0 GHz 1.5 1.8 dB
1.0–2.0 GHz 2.1 2.4 dB
2.0–2.5 GHz 2.4 2.7 dB
2.5–3.0 GHz 2.7 3.0 dB
Attenuation Range 15 dB
Attenuation Accuracy
2
0.5–1.0 GHz ± (0.2 + 2% of dB
Attenuation Setting in dB)
1.0–3.0 GHz ± (0.3 + 3% of dB
Attenuation Setting in dB)
VSWR (I/O)
3
0.5–2.5 GHz 1.5:1 2.0:1
2.5–3.0 GHz 1.7:1 2.2:1
Switching Characteristics
4
Rise, Fall (10/90% or 90/10% RF) 180 ns
On, Off (50% CTL to 90/10% RF) 270 ns
Video Feedthru 50 mV
Input Power for 1 dB Compression VS= +3 V 0.5–3.0 GHz +20 +24 dBm
VS= +5 V 0.5–3.0 GHz +25 +29 dBm
Intermodulation Intercept Point (IP3) For Two-tone Input Power +5 dBm
VS= +3 V 0.5–3.0 GHz +43 +49 dBm
VS= +5 V 0.5–3.0 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 0.5–3.0 GHz AA105-86
Insertion Loss (dB)
Frequency (GHz)
Insertion Loss vs. Frequency
0 0.5 1.0 1.5 2.0 2.5 3.0
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
+25˚C
+85˚C
-40˚C
IP3 (dBm)
Attenuation (dB)
IP3 vs. Attenuation and
Temperature (500 MHz)
0123456789101112131415
44
46
48
50
52
54
56
58
60
+25˚C
+85˚C
-40˚C
VSWR
0 0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
VSWR vs. Frequency (25˚C)
1.0
1.2
1.4
1.6
1.8
2.0
15 dB
Ins. Loss
1 dB
2 dB
4 dB
8 dB
VSWR
Frequency (GHz)
VSWR vs. Frequency (85˚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
Ins. Loss
1 dB
2 dB
4 dB
8 dB
15 dB
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
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 31.1 30.9 31.2
1 dB 5 31.3 31.4 31.3
2 dB 5 31.0 30.8 31.1
4 dB 5 32.5 31.4 33.6
8 dB 5 33.0 32.4 33.5
15 dB 5 29.9 28.0 31.4
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 0.5–3.0 GHz AA105-86
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)
-0.5
-0.4
-0.3
-0.2
-0.1
0.1
0.2
0.3
0.4
0
0.5
1 dB
2 dB
4 dB
8 dB
15 dB
-0.5
-0.4
-0.3
-0.2
-0.1
0.1
0.2
0.3
0.4
0
0.5
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 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 dB
2 dB
4 dB
8 dB
15 dB
-0.5
-0.4
-0.3
-0.2
-0.1
0.1
0.2
0.3
0.4
0
0.5
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 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 (-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 0.5–3.0 GHz AA105-86
Insertion Loss (dB)
Frequency (GHz)
Insertion Loss vs. Frequency
0 0.5 1.0 1.5 2.0 2.5 3.0
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
+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
Ins. Loss
1 dB
2 dB
4 dB
8 dB
15 dB
-0.5
-0.4
-0.3
-0.2
-0.1
0.1
0.2
0.3
0.4
0
0.5
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 dB
2 dB
4 dB
8 dB
15 dB
-0.5
-0.4
-0.3
-0.2
-0.1
0.1
0.2
0.3
0.4
0
0.5
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 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
-0.5
-0.4
-0.3
-0.2
-0.1
0.1
0.2
0.3
0.4
0
0.5
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
1 dB
2 dB
4 dB
8 dB
15 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 1 dB LSB Positive Control 0.5–3.0 GHz AA105-86
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.
DC blocking capacitors (CBL) and biasing resistor must be supplied
externally for positive voltage operation.
C
BL
= 47 pF for operation >500 MHz.
8 dB
4 dB
2 dB
1 dB
V
4
V
3
V
2
J
1
GND
GND
GND
GND
V
1
J
2
V
S
C
BL
C
BL
10 kΩ
1
10
2
9
3
8
4
7
5
6
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.
IP3 (dBm)
Attenuation (dB)
IP3 vs. Attenuation and
Temperature (500 MHz)
0123456789101112131415
45
46
47
48
49
50
51
52
53
54
55
56
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 24.7 24.2 24.4
1 dB 3 25.2 24.9 25.0
2 dB 3 24.8 24.2 24.7
4 dB 3 31.1 30.5 31.9
8 dB 3 25.1 25.9 27.3
15 dB 3 24.9 24.4 27.0
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