Alpha Industries, Inc. [781] 935-5150 •Fax [617] 824-4579 •Email sales@alphaind.com •www.alphaind.com 1
Specifications subject to change without notice. 04/00A
GaAs IC 1 Bit Digital Attenuator
10 dB LSB DC–2.5 GHz
Features
■ Attenuation Cutback of 10 dB
■ Single Positive 3 V Control
■ Low Loss
■ Low Cost SOT-5 Plastic Package
SOT-5
AA103-72
0.074
(1.90 mm)
REF. 0.118
(3.00 mm)
0.087
(2.20 mm)
0.012
(0.30 mm)
0.000
(0.00 mm)
MIN.
0.122 (3.10 mm)
0.106 (2.70 mm)
0.064 (1.63 mm)
0.035 (0.90 mm)
0.020 (0.51 mm)
0.014 (0.35 mm)
PIN 1
0.037 (0.95 mm) REF.
0.069
(1.75 mm)
0.052
(1.30 mm)
0.024
(0.61 mm)
0.004
(0.10 mm)
0.0104 (0.26 mm)
0.0035 (0.09 mm) MIN.
0.012 (0.30 mm) TYP.
Description
The AA103-72 is a 1 bit GaAs IC FET digital attenuator
in a low cost package. This attenuator has an LSB of
10 dB. The AA103-72 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.
Parameter1Frequency Min. Typ. Max. Unit
Inser tion Loss2DC–0.5 GHz 0.3 0.5 dB
DC–1.0 GHz 0.3 0.6 dB
DC–2.5 GHz 0.4 0.7 dB
Attenuation Range 10 dB
Attenuation Accuracy3DC–1.0 GHz ± (0.25 + 3% of
Attenuation Setting in dB) dB
DC–2.5 GHz ± (0.4 + 5% of
Attenuation Setting in dB) dB
VSWR (I/O) DC–2.5 GHz 1.2:1 1.4:1
Electrical Specifications at 25°C (0, +3 V)
Parameter Condition Frequency Min. Typ. Max. Unit
Switching Characteristics4, 5 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 dBm
VS= +5 V 0.5–2.5 GHz +26 dBm
Intermodulation Intercept Point (IP3) For Two-tone Input Power +10 dBm
VS= +3 V 0.5–2.5 GHz +41 dBm
VS= +5 V 0.5–2.5 GHz +45 dBm
Control Voltages VLow = 0 to 0.2 V
VHigh = +3 V @ 25 µA Typ. to +5 V @ 50 µA Typ .
Operating Characteristics at 25°C (0, +3 V)
1.All measurements made in a 50 Ωsystem, unless otherwise specified.
2. Insertion loss changes by 0.003 dB/°C.
3. Maximum attenuation includes insertion loss.
4.Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
5. Switching characteristics will vary with value chosen for CBP.
2Alpha Industries, Inc. [781] 935-5150 •Fax [617] 824-4579 •Email sales@alphaind.com •www.alphaind.com
Specifications subject to change without notice. 04/00A
GaAs IC 1 Bit Digital Attenuator 10 dB LSB DC–2.5 GHz AA103-72
V1V2J1–J2
VHigh 0 Inser tion Loss
0V
High Attenuation
Truth Table
VHigh = +3 to +5 V (VS= VHigh ± 0.2 V).
123
54
CBL
CBP
CBL
VS
10
J2
J1
RF GND
10 kΩ
V1
V2
Pin Out
DC blocking capacitors (CBL), bypass capacitor (CBP), and biasing resistor
must be supplied externally for positive voltage operation.
CBL, CBP = 33 pF for operation @ 900 MHz.
Insertion Loss vs. Frequency
Frequency (GHz)
Insertion Loss (S21, dB)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0.0 0.5 1.0 1.5 2.0 2.5
Frequency (GHz)
Attenuation (S21, dB)
7
8
9
10
11
12
13
0.0 0.5 1.0 1.5 2.0 2.5
Attenuation vs. Frequency
VSWR vs. Frequency
Frequency (GHz)
VSWR
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
0.0 0.5 1.0 1.5 2.0 2.5
Typical Performance Data (0, +3 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.
