ALPHA AA103-72 Datasheet

Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • 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 par ticularly 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

Frequency Min. Typ. Max. Unit

Insertion Loss

2

DC–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 Accuracy

3

DC–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 Characteristics

4, 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

V

S

= +3 V 0.5–2.5 GHz +41 dBm

VS= +5 V 0.5–2.5 GHz +45 dBm

Control Voltages V

Low

= 0 to 0.2 V

V

High

= +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 C

BP

.

2 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • 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

V

1

V

2

J1–J

2

V

High

0 Insertion Loss

0V

High

Attenuation

Truth Table

V

High

= +3 to +5 V (VS= V

High

± 0.2 V).

123

54

C

BL

C

BP

C

BL

V

S

10

J

2

J

1

RF GND

10 kΩ

V

1

V

2

Pin Out

DC blocking capacitors (CBL), bypass capacitor (CBP), and biasing resistor
must be supplied externally for positive voltage operation.
C

BL

, CBP= 33 pF for operation @ 900 MHz.

Insertion Loss vs. Frequency

Frequency (GHz)

Insertion Loss (S

21

, 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 (S

21

, 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.