Datasheet AT90-1263TR, AT90-1263-TB, AT90-1263 Datasheet (MACOM)

Digital Attenuator, 31 dB, 5-Bit,
TTL Driver, DC-4.0 GHz

V 6.00

AT90-1263

Features

n Attenuation: 1.0dB Steps to 31dB
n Single Positive Supply
n Contains internal DC to DC converter
n Low DC Power Consumption
n Small Footprint, JEDEC Package
n Integral TTL Driver
n 50 ohm Impedance

Description

M/A-COM's AT90-1263 is a GaAs FET 5-bit digital
attenuator with integral TTL driver. Step size is 1.0 dB
providing 31dB total attenuation range. This device is in an
FQFP-N plastic surface mount package. The AT90-1263 is
ideally suited for use where accuracy, fast speed, very low
power consumption and low costs are required.

CSP-1

Electrical Specifications TA = +25°C

Parameter Test Conditions Frequency Units Min Typical Max

Insertion Loss — DC - 4.0 GHz dB — 3.5 3.8

Attenuation

Accuracy

VSWR Full Range DC - 4.0 GHz Ratio — 2.0:1 2.2:1

Switching Speed

1 dB Compression —

Input IP

3

+Vcc — — V 4.75 5.0 5.25

Logic “0” Sink Current is 20 µA max. — V 0.0 — 0.8
Logic “1” Source Current is 20 µA max. — V 2.0 — 5.0

Icc Vcc min to max,

Individual Bits 1-2-4-8-16 dB
Any Combination of Bits 1 to

50% Cntl to 90%/10% RF

10% to 90% or 90% to 10%

Two-tone inputs up to +5 dBm 50 MHz

31 dB

—

Logic “0” or “1”

DC - 3.0 GHz
DC - 4.0 GHz
DC - 4.0 GHz

—
—

50 MHz

0.5 - 4.0 GHz

0.5-4.0 GHz

— mA — 6 10

dB
dB
dB

nS
nS

dBm
dBm — —

dB
dB

—
—
—

—
—

—
—

—
—
—

75
20

+21
+29

+35
+48

±(.3 +5% of atten setting)
±(.4 +6% of atten setting)
±(.5 +7% of atten setting)

150

50
—

—
—

—

Digital Attenuator, 31 dB, 5-Bit, TTL Driver, DC - 4.0 GHz

AT90-1263

V 6.00

Pin Configuration

Pin # Function Pin # Function

1 GND 17 NC
2 C16 18 NC

3 C8 19 +Vcc2
4 C4 20 NC
5 C2 21 Cp4
6 C1 22 NC
7 GND 23 Cp4

8 NC 24 NC

9 NC 25 -Vee3
10 NC1 26 GND
11 GND 27 RF2
12 RF1 28 GND
13 GND 29 NC1
14 NC 30 -Vee
15 NC 31 NC
16 NC 32 +Vcc

1. Pins 10 & 29 must be isolated

2. Pin 19 must be connected to Pin 32

3. Pin 25 must be connected to Pin 30

4. .01µF cap must be connected between Pins 21 and 23

5. -Vee is produced internally and requires a .1µF cap to
GND

6. +Vcc requires a .1µF cap to GND

3,5

2,6

Recommended PCB Layout 7

7. Application Note C2083 is available on line at
www.macom.com

Truth Table

Absolute Maximum Ratings 8

Parameter Absolute Maximum

Max. Input Power

0.05 GHz

0.5 - 4.0 GHz
+Vcc +5.5V

Logic Voltages

Operating Temperature -40°C to +85°C

Storage Temperature -65°C to +125°C

8. Operation of this device above any one of these parameters
may cause permanent damange.

9. Standard CMOS TTL interface, latch-up will occur if logic
signal is applied prior to power supply.

9

-0.5 to +Vcc + 0.5V

Specifications subject to change without notice.

n North America: Tel. [phone]
n Asia/Pacific: Tel.[phone], Fax [phone]
n Europe: Tel. [phone], Fax[phone]

Visit www.macom.com for additional data sheets and product information.

+27 dBm
+34 dBm

C16 C8 C4 C2 C1 Attenuation

0 0 0 0 0 Loss, Reference
0 0 0 0 1 1.0 dB
0 0 0 1 0 2.0 dB
0 0 1 0 0 4.0 dB
0 1 0 0 0 8.0 dB
1 0 0 0 0 16.0 dB
1 1 1 1 1 31.0 dB

0 = TTL Low; 1 = TTL High

2

Digital Attenuator, 31 dB, 5-Bit, TTL Driver, DC - 4.0 GHz

Typical Performance Curves

Insertion Loss VSWR @ Insertion Loss

4.0

3.0

Loss (dB)

2.0

3.00

2.00

VSWR

AT90-1263

V 6.00

Input Output

1.0
0 1000 2000 3000 4000

Frequency (MHz)

0.3

0.2

0.1

Error (dB)

0

-0.1
0 1000 2000 3000 4000

Frequency (MHz)

Attenuation Error, 4 dB Bit

0.7

1.00
0 1000 2000 3000 4000

Frequency (MHz)

Attenuation Error, 2 dB Bit Attenuation Error, 1 dB Bit

0.3

0.2

0.1

Error (dB)

0

-0.1
0 1000 2000 3000 4000

Frequency (MHz)

Attenuation Error, 8 dB Bit

0.7

0.5

0.3

Error (dB)

0.1

-0.1
0 1000 2000 3000 4000

Frequency (MHz)

Specifications subject to change without notice.

n North America: Tel. [phone]
n Asia/Pacific: Tel.[phone], Fax [phone]
n Europe: Tel. [phone], Fax[phone]

Visit www.macom.com for additional data sheets and product information.

0.5

0.3

Error (dB)

0.1

-0.1
0 1000 2000 3000 4000

Frequency (MHz)

3

Digital Attenuator, 31 dB, 5-Bit, TTL Driver, DC - 4.0 GHz

Input

Output

Typical Performance Curves

AT90-1263

V 6.00

Attenuation Error, 16 dB Bit

1.5

0.5

Error (dB)

-0.5

-1.5
0 1000 2000 3000 4000

Frequency (MHz)

1.8

1.6

1.4

VSWR

1.2

Attenuation Error, Max. Attenuation

1.5

0.5

-0.5

Error (dB)

-1.5
0 1000 2000 3000 4000

Frequency (MHz)

VSWR, 2 dB Bit VSWR, 1 dB Bit

Input Output

1.6

1.4

VSWR

1.2

1.0
0 1000 2000 3000 4000

Frequency (MHz)

VSWR, 4 dB Bit

Input Output

1.6

1.4

VSWR

1.2

1.0

0 1000 2000 3000 4000

Frequency (MHz)

Specifications subject to change without notice.

n North America: Tel. [phone]
n Asia/Pacific: Tel.[phone], Fax [phone]
n Europe: Tel. [phone], Fax[phone]

Visit www.macom.com for additional data sheets and product information.

1.0
0 1000 2000 3000 4000

Frequency (MHz)

VSWR, 8 dB Bit

Input Output

1.6

1.4

VSWR

1.2

1.0
0 1000 2000 3000 4000

Frequency (MHz)

4

Digital Attenuator, 31 dB, 5-Bit, TTL Driver, DC - 4.0 GHz

Typical Performance Curves

AT90-1263

V 6.00

VSWR, 16 dB Bit

Input Output

1.6

1.4

VSWR

1.2

1.0
0 1000 2000 3000 4000

Frequency (MHz)

Ordering Information

Part Number Package

AT90-1263 Bulk Packaging

AT90-1263TR Tape and Reel (1K Reel)

AT90-1263-TB Units Mounted on Test Board

VSWR, Maximum Attenuation

Input

1.6

1.4

VSWR

1.2

1.0
0 1000 2000 3000 4000

Frequency (MHz)

Output

Specifications subject to change without notice.

n North America: Tel. [phone]
n Asia/Pacific: Tel.[phone], Fax [phone]
n Europe: Tel. [phone], Fax[phone]

Visit www.macom.com for additional data sheets and product information.

5