MACOM AT-266TR, AT-266RTR, AT-266 Datasheet

Digital Attenuator, 1 Bit, 10 dB Step, DC - 2.0 GHz AT-266

AT-266

Digital Attenuator, 1 Bit, 10 dB Step
DC - 2.0 GHz

Features

•

Single 10 dB Step

•

Low Loss 0.3dB Typ. @ 900 MHz

•

Low Cost Plastic SOT25 Package

Description

M/A-COM’s AT-266 is a 1 bit, 10 dB step GaAs MMIC Digital
Attenuator in a low cost SOT-25 surface mount pl as t ic p ackage.
The AT-266 is ideally suited for us e where high accuracy, v ery
low power consumption and low intermodulation products are
required. Typical applications include radio, wireless LANs,
GPS equipment and other gain/level control circuits.

The AT-266 is a GaAs MMIC using a mature 1 micron pr ocess .
The process features full chip passivation for increased perfor­mance and reliability.

Pin Configuration

PIN No. Function Description

1RF1
2GND

3RF21RF In/Out
4 V1 Control Voltage
5 V2 Control Voltage

1. Series Capacitors on PINs1, 3 and 5, Shunt Capacitor on PIN 2
are required for Postive Control. 39pF capacitors used for pos­tive control performance curves.

Electrical Specifications TA = 25°C

1

1

RF In/Out

RF Ground

1

SOT-25 Plastic Package

.114 ± .008

2,9 ± 0,2

.075 ± .008

1,90 ± 0,2

- .002
+ 0,1

- 0,05

.110 ± .008

2,80 ± 0,2

.002 ± .002

0,05 ± 0,05
.031
0,80

+ .004

- .007
+ 0,1

- 0,18

.063 ± .004

1,6 ± 0,1

Pin 1

.016
0,40

+ .004

Truth Table

(Control)

MODE

1

Postive

Postive / Negative

Negative

3

1,2

1. External DC blocking capactors are required as noted

2. | -VC | + VC ≤ 8 V.

3. If negative control is used, DC blocking capacitors are not
required on RF Ports.

V1 V2 Atten.

0 ± 0.2V

+3 to +8V

-VC ± 0.2 V
+ V

C

0 ± 0.2V

-3V to -8V

+3 to +8V

0 ± 0.2V

+V

C

-VC ± 0.2V

-3V to -8V
0 ± 0.2V

10 dB

10 dB

10 dB

1

+ .008
.043
1,10

.008 MIN
0,20 MIN

+ .004
.006
0,15

IL

IL
IL

- .004
+ 0,2

- 0,1

- .002
+ 0,1

- 0,05

Parameter Test Conditions Units Min. Typ. Max.

Insertion Loss 0 - 1 GHz dB 0.3 0.45
Insertion Loss 1 - 2 GHz dB 0.5 0.7
Attenuation 0 - 1 GHz dB 10 ±0.4

1 - 2 GHz dB 10 ±0.5
VSWR 0 - 2 GHz 1.4:1 1.5:1
IP

3

P

1dB

rise, Tfall

T

on, Toff

T

ransients

T

1. All measurements at 1.0 GHz, -3 Volts control unless otherwise specified.

M/A-COM Division of AMP Incorporated 3 North America: Tel. [phone], Fax [phone] Asia/Pacific: Tel.[phone], Fax [phone]

3

Europe: Tel. [phone], Fax[phone]

www.macom.com

AMP and Connecting at a Higher Level are trademarks.

Specifications subject to change without notice.

2 Tone @ 0 dBm, 5 MHz spacing dBm 42 50

1 GHz dBm 23 28

10% to 90% RF, 90% to 10% RF ns 5 20

50% Control to 90% RF, 50% Control to 10% RF ns 10 25

In Band mV 6 10

V2.00

Digital Attenuator, 1 Bit, 10 dB Step, DC - 2.0 GHz AT-266

+

-

P

N

Ordering Information

Part Number Package

AT-266 SOT-25 Plastic Package
AT-266TR Forward Tape and Reel
AT-266RTR Reverse Tape and Reel

1. Refer to Application Note M513 for reel size information.

1

1

Typical Performance Curves

Insertion Loss vs. Frequency Over
Temperature (Negative Control)

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

INSERTION LOSS (dB)

0.2

0.1
0

00.511.522.53

+85°C

FREGUENCY ( GHz)

Relative Attenuation vs. Frequency Over
Temperature (Posative Control)

11

10.8

10.6

10.4

10.2
10

9.8

9.6

9.4

INSERTION LOSS (dB)

9.2
9

0 0.5 1 1.5 2 2.5 3

FREGUENCY (GHz)

Return Loss vs. Frequency
(Reference State)

40
35
30
25
20
15
10

RETURNLOSS (dB)

5
0

0 0.5 1 1.5 2 2.5 3

Positive Control

FREQUENCY (GHz)

+25°C

-40°C

-40°C
+25°C

+85°C

Negative Control

Absolute Maximum Ratings

1

Parameter Absolute Maximum

Max. Input Power

50 MHz +27 dBm

500 - 2000 MHz +34 dBm
Control Voltage +5V, -8.5V
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +150°C

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

cause permanent damage.

Insertion Loss vs. Frequency Over
Temperature (Postive Control)

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

INSERTION LOSS (dB)

0.1
0

0 0.5 1 1.5 2 2.5 3

+85°C

FREGUENCY (GHz)

+25°C

40°C

Relative Attenuation vs. Frequency Over
Temperature (Negative Control)

11

10.8

10.6

10.4

10.2
10

9.8

9.6

INSERTION LOSS (dB)

9.4

9.2
9

00.511.522.53

+85°C

FREGUENCY (GHz)

-40°C

25°C

Return Loss vs. Frequency
(10 dB State)

35

30

25

20

15

10

RETURNLOSS (dB)

5

0

0 0.5 1 1.5 2 2.5 3

ositive Control

FREQUENCY (GHz)

egative Cont rol

V2.00

M/A-COM Division of AMP Incorporated 3 North America: Tel. [phone], Fax [phone] Asia/Pacific: Tel.[phone], Fax [phone]

3

Europe: Tel. [phone], Fax[phone]

www.macom.com

AMP and Connecting at a Higher Level are trademarks.

Specifications subject to change without notice.