MACOM AT-357SMA Datasheet

GaAs Digital Attenuator, 31 dB, 5 Bit

pg

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DC - 2 GHz

Features

●

Attenuation 1 dB Steps to 31 dB

●

TTL Control Interface

●

Hermetic Connectorized Housing

Guaranteed Specifications

Frequency Range DC to 2.0 GHz
Nominal Attenuation
Attenuation Accuracy

DC – 1.0 GHz ±(0.2 dB + 2% of Attenuation Setting in dB) dB

1.0 – 2.0 GHz ±(0.2 dB + 2% of Attenuation Setting in dB) dB

VSWR DC – .025 GHz 2.2:1 Max

Reference Insertion Loss DC – 0.5 GHz 5.5 dB Max

Operating Characteristics

Impedance 50 Ohms Nominal
Switching Characteristics

Ton, (50% CTL to 90% RF) 160 ns Typ
Toff (50% CTL to 10% RF) 80 ns Typ
Trise, (10% RF to 90% RF) 15 ns Typ
Tfall (90% RF to 10% RF) 3 ns Typ
Switching Transients (unfiltered) 130 mV Typ

Input Power for 1 dB Compression

0.5 – 2.0 GHz 28 dBm Typ

0.05 GHz 15 dBm Typ

Intermodulation Intercept Point (for two-tone input power up to +5 dBm)

Intercept Points IP2 IP3

0.5 – 2.0 GHz +55 +47 dBm Typ

0.05 GHz +45 +28 dBm Typ

Bias Power +15 VDC @ 5 mA Max

Control 5 line, TTL Data Bus

Vin Low (0) 0.0 to 0.8V @ 1 µA Max
Vin High (1) 2.4 to 5.0V @ 1 µA Max

1. All specifications apply when operated with bias voltages of +15 VDC and -12VDC
and a 50 ohm impedance at both RF ports.

2. Above reference insertion loss.

3. Contact the factory for standard or custom screening requirements.

Ordering Information

Model No. Package

AT-357 SMA Connectorized

AT-357

V3.00

C-46

(5.8)

(2.92)

0.000

0.23 Ref

0.115

1

2

.025 – 0.5 GHz 1.8:1 Max

0.2 – 2.0 GHz 1.5:1 Max

0.5 – 1.0 GHz 1.4:1 Max

0.5 – 1.0 GHz 6.0 dB Max

1.0 – 2.0 GHz 6.5 dB Max

(-55°C to +85°C)

1 dB Steps to 31 dB

0.000

0.330

(8.38)

0.230 (5.84)

0.115 (2.92)

0.000

0.205 (5.21)

0.660 (16.76)

0.000

0.250

(6.35)

Unless Otherwise Noted: .xxx = ± 0.010 (.xx = ± 0.25)

Functional Schematic (Top View)

1 dB

RF1

-12 VDC @ 3 mA Max

2 dB

+15V GND GND GND GND -12V

C1 C2 C3 C4 C5

T ruth Table

Control Input Attenuator Setting

C1 C2 C3 C4 C5

0 0 0 0 0 REFERENCE
1 0 0 0 0 1 dB
0 1 0 0 0 2 dB
0 0 1 0 0 4 dB
0 0 0 1 0 8 dB
0 0 0 0 1 16 dB

Any Combination Sum of Bits Selected

"1" = Logic High (TTL) "0" = Logic Low (TTL)

.093±.005 Dia Thru

(2.36 ± 0.13) 

0.000

0.070 (1.78)

4 Places

1.235 ± .005

(31.37 ± 0.13)

0.090 (2.29)
10 Places

0.900 Ref.
(22.86)

Bottom of case is AC ground.

Dimensions in ( ) are in mm.

.xx = ± 0.02 (.x = ± 0.5)

4 dB

8 dB

1.375 (34.92)

.025 ±.005 Dia Pin

(0.64 ± 0.13)

16 dB

Removable

SMA Jack

Receptacle

2 Places

11 Places

0.250

(6.35)

0.20
(5.1)

Typ

RF2

M/A-COM, Inc.

Specifications Subject to Change Without Notice.

North America: Tel. [phone] ■ Asia/Pacific: Tel. [phone] ■ Europe: Tel. [phone]

Fax [phone] Fax [phone] Fax [phone]

1

GaAs Digital Attenuator, 31dB, 5 Bit

Absolute Maximum Ratings

1

AT-357

V3.00

Parameter Absolute Maximum

1

Max. Input Power

0.05 GHz +27 dBm

0.5 – 2.0 GHz +32 dBm

Bias Voltage

+15V Supply (V+) -0.7V to + 18V

-12V Supply (V-) -15V to + 0.7V

Control Voltage (V-)-2V to (V+)+2V

(or 30 mA, whichever comes first)
Operating Temperature -55°C to +125°C
Storage Temperature -65°C to +150°C

Note: 1. Operation of this device above any one of these parameters may cause

permanent damage.

Typical Performance

ATTENUATION FLATNESS vs. FREQUENCY

1.0

0.5

0.0

-0.5

DEVIATION FROM

31 dB

1,2,4,8,16 dB

REFERENCE INSERTION LOSS vs. FREQUENCY

1.0

2.0

3.0

4.0

LOSS (dB)

5.0

NOMINAL ATTENUATION (dB)

-1.0
0

Specifications Subject to Change Without Notice.

0.5 1.0 1.5
FREQUENCY (GHz)

VSWR vs. FREQUENCY

2.0

1.8

1.6

VSWR

1.4

1.2

1.0
0

2.0

Insertion Loss and 1 dB Bit

Attenuation of 2 dB and Greater

0.5
FREQUENCY (GHz)

1.0 1.5

2

6.0

0.5 1.0 1.5 2.00
FREQUENCY (GHz)

2.0

M/A-COM, Inc.

North America: Tel. [phone] ■ Asia/Pacific: Tel. [phone] ■ Europe: Tel. [phone]

Fax [phone] Fax [phone] Fax [phone]