ALPHA AT002S3-11 Datasheet

Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com 1

Specifications subject to change without notice. 3/99A

GaAs 35 dB IC Voltage Variable Single
Control Attenuator 0.4–2.5 GHz

Features

■ Single Positive Control Voltage

■ 35 dB Attenuation Range

■ 8 Lead Hermetic Surface Mount Package

■ Capable of Meeting MIL-STD

Requirements

5

-11

AT002S3-11

Description

The AT002S3-11 is a GaAs IC FET absorptive bridged “T”
attenuator.This attenuator operates from 0.4–2.5 GHz and
provides up to 35 dB of attenuation.The key feature of this
attenuator is the requirement of only one “positive”control
voltage.Blocking capacitors are required on the RF ports.

0.180 (4.57 mm)
SQ. MAX.

0.400 (10.16 mm)

0.380 (9.65 mm)

0.150

(3.81 mm)

0.050

(1.27 mm)

TYP.

ORIENTATION

MARK

0.017 (0.43 mm)

0.013 (0.33 mm)

0.006 (0.15 mm)

0.004 (0.10 mm)

0.250 (6.35 mm)

0.200 (5.08 mm)

0.070 (1.78 mm)

0.040 (1.02 mm)

0.075

(1.91 mm)

MAX.

1.All measurements made in a 50 Ω system, unless otherwise specified.

2. Insertion loss changes by 0.003 dB/°C.

3. For all attenuation levels.

4.Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.

5.See Quality/Reliability section.

Parameter Condition Frequency Min. Typ. Max. Unit

Switching Characteristics Rise, Fall (10/90% or 90/10% RF) 0.5 µs

On, Off (50% CTL to 90/10% RF) 1.0 µs
Video Feedthru

4

20 mV

Attenuation Flatness 0–10 dB 0.4–2.5 GHz ±1.0 dB

11–20 dB ±1.5 dB
21–30 dB ±3.0 dB

31–Max. ±4.0 dB
Input Power for 1 dB Compression For All Attenuation Levels 0.9 GHz -3 dBm
Control Voltages V

Low

= 0 to -0.2 V @ 25 µA Max.

V

High

= 5 V @ 100 µA Typ.

Supply Voltages (VS) 5 V @ 100 µA Max.

Operating Characteristics at 25°C

Parameter

1

Frequency Min. Typ. Max. Unit

Insertion Loss (V1= 5 V)

2

0.4–1.0 GHz 1.5 1.7 dB

1.0–2.0 GHz 1.7 2.0 dB

1.0–2.5 GHz 2.2 2.5 dB

Attenuation Range (V1= 0) 0.4–1.0 GHz 30 35 dB

1.0–2.5 GHz 33 38 dB

VSWR (I/O)

3

0.4–2.5 GHz 2.2:1 2.5:1

Electrical Specifications at 25°C

GaAs 35 dB IC Voltage Variable Single Control Attenuator 0.4–2.5 GHz AT002S3-11

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

Specifications subject to change without notice. 3/99A

Insertion Loss vs. Frequency

Frequency (GHz)

0.4

0.4 0.8 1.2 2.0 2.4

1.6

2.8

0.8

1.2

1.6

2.0

Insertion Loss (dB)

2.4

+85˚C

-55˚C

Relative Attenuation vs. Control Voltages

Attenuation (dB)

0

0 5 10 25 30

15 20

35

1

2

3

4

V

1

(V)

5

F = 1 GHz

Attenuation (By State) vs. Frequency

Frequency (GHz)

5

0.4 0.8 1.2 2.0 2.4

1.6

2.8

10

15

20

25

Attenuation (dB)

30

±4.5 dB

±3.5 dB

±2.5 dB

±0.8 dB

±1.5 dB

±0.5 dB

V1 = 2.24

V

1

= 2.43

V1 = 2.80

V

1

= 2.96

V

1

= 3.14

V

1

= 2.62

Typical Performance Data

Pin Out

J

1

GND
GND

5 V

V

1

GND

GND

J

2

Characteristic Value

RF Input Power (RF In) 5 mW > 500 MHz
Bias Voltage (VB) 8 V
Control Voltage (VC) ≤ 8 V
Operating Temperature (TOP) -55°C to +125°C
Storage Temperature (TST) -65°C to +150°C
Thermal Resistance (ΘJC) 25°C/W

Absolute Maximum Ratings

Do not allow control voltage V1to exceed supply voltage (VS).

Note: Blocking capacitors required at J

1

and J2.