Datasheet AT90-1233TR, AT90-1233-TB, AT90-1233 Datasheet (MACOM)

Digital Attenuator, 30 dB, 4-Bit,
TTL Driver, DC - 2.5 GHz

V 1.00

AT90-1233

Features

n Attenuation: 2 dB Steps to 30 dB
n Single Positive Supply
n Contains Internal DC to DC Converter
n Small Footprint, JEDEC Package
n Integral TTL Driver
n 50 Ohm Impedance
n Test Boards Available
n Tape and Reel Packaging Available

Description

M/A-COM’s AT90-1233 is a GaAs FET 4-Bit digital
attenuator with integral driver. Step size is 2 dB providing
a 30 dB attenuation range. This device is in an FQFP-N
plastic surface mount package. The AT90-1233 is suited
for single supply applications where accuracy, fast speed,
low power consumption and low costs are required.

Electrical Specifications TA = +25°C

CSP-1

Parameter Test Conditions Frequency Units Min Typical Max

Insertion Loss — DC - 2.5 GHz dB — 2.7 3.0

Attenuation

Accuracy

VSWR Full Range DC - 2.5 GHz Ratio — 1.5:1 1.8:1

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 or Combination

50% Cntl to 90%/10% RF

10% to 90% or 90% to 10%

Two-tone inputs up to +5 dBm 50 MHz

of Bits

—

Logic “0” or “1”

DC - 2.5 GHz dB — — ±(.3 +5% of atten setting)

0.5 - 2.5 GHz

0.5 - 2.5 GHz

—
—

50 MHz

— mA — 6 10

nS
nS

dBm
dBm

dB
dB

—
—

—
—

—
—

75
20

+21
+29

+35
+48

150

50
—

—
—

—

Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz

AT90-1233

V 1.00

Pin Configuration

Pin No. Function Pin No. Function

1 GND 17 N/C
2 C16 18 N/C
3 C8 19 +VCC2
4 C4 20 N/C
5 C2 21 Cp4
6 GND 22 N/C
7 GND 23 Cp4
8 N/C 24 N/C

9 N/C 25 -VEE3
10 N/C1 26 GND
11 GND 27 RF2
12 RF1 28 GND
13 GND 29 N/C1
14 N/C 30 -VEE
15 N/C 31 N/C
16 N/C 32 +VCC

1. Pins 10 and 29 must be isolated.

2. Pin 19 must be connected to Pin 32.

3. Pin 25 must connect to Pin 30.

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

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

6. +VCC requires a .1 µF cap to GND.

3,5

2,6

Truth Table

C16 C6 C4 C2 Attenuation

0 0 0 0 Loss, Reference
0 0 0 1 2.0 dB
0 0 1 0 4.0 dB
0 1 0 0 8.0 dB
1 0 0 0 16.0 dB
1 1 1 1 30.0 dB

0 = TTL Low; 1 = TTL High

Recommended PCB Layout 7

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

Absolute Maximum Ratings 8

Parameter Absolute Maximum

Max. Input Power

0.05 GHz

0.5 - 2.5 GHz
+Vcc +5.5V

-Vee -8.5V

Logic Voltages 9 -0.5 to +Vcc + 0.5V

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.

+27 dBm
+34 dBm

Ordering Information

Part Number Package

AT90-1233 Bulk Packaging

AT90-1233TR Tape and Reel (1K Reel)

AT90-1233-TB Units Mounted on Test Board

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.

2

Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz

Input

Output

Typical Performance Curves

VSWR @ Insertion Loss Insertion Loss

AT90-1233

V 1.00

3.00

2.50

2.00

Attenuation (dB)

1.50

1.00
0 500 1000 1500 2000 2500

Frequency (MHz)

Attenuation Error, 2 dB Bit

0.30

0.20

0.10

0.00

-0.10

Attenuation (dB)

-0.20

1.60

1.40

VSWR

1.20

1.00
0 500 1000 1500 2000 2500

Frequency (MHz)

Attenuation Error, 4 dB Bit

0.40

0.20

0.00

Attenuation (dB)

-0.20

-0.30
0 500 1000 1500 2000 2500

Frequency (MHz)

Attenuation Error, 8 dB Bit

0.40

0.20

0.00

Attenuation (dB)

-0.20

-0.40
0 500 1000 1500 2000 2500

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.

-0.40
0 500 1000 1500 2000 2500

Frequency (MHz)

Attenuation Error, 16 dB Bit

0.00

-0.20

-0.40

Attenuation (dB)

-0.60

-0.80
0 500 1000 1500 2000 2500

Frequency (MHz)

3 3

Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz

Typical Performance Curves

AT90-1233

V 1.00

0.50

0.00

-0.50

-1.00

Attenuation (dB)

-1.50
0 500 1000 1500 2000 2500

Frequency (MHz)

VSWR, 4 dB Bit

Output Input

1.60

1.40

VSWR

1.20

VSWR, 2 dB Bit Attenuation Error, Max. Attenuation

Output Input

1.60

1.40

VSWR

1.20

1.00
0 500 1000 1500 2000 2500

Frequency (MHz)

VSWR, 8 dB Bit

Output Input

1.60

1.40

VSWR

1.20

1.00
0 500 1000 1500 2000 2500

Frequency (MHz)

VSWR, 16 dB Bit

Output Input

1.60

1.40

VSWR

1.20

1.00
0 500 1000 1500 2000 2500

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.

1.00
0 500 1000 1500 2000 2500

Frequency (MHz)

VSWR, Maximum Attenuation

Output Input

1.60

1.40

VSWR

1.20

1.00
0 500 1000 1500 2000 2500

Frequency (MHz)

4