Page 1
Digital Attenuator, 30 dB, 4-Bit,
TTL Driver, DC - 2.5 GHz
V 1.00
AT90-0233
Features
n Attenuation: 2 dB Steps to 30 dB
n Low DC Power Consumption
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 AT90-0233 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 AT90-0233 is suited
for use where accuracy, fast speed, very 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
-Vee
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,
-Iee -Vee 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”
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 — 0.2 6
— mA — -0.2 -1
nS
nS
dBm
dBm
dB
dB
V
V
—
—
—
—
—
—
4.75
-8.0
75
20
+21
+29
+35
+48
5.0
-5.0
150
50
—
—
—
—
5.25
-4.75
Page 2
Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz
AT90-0233
V 1.00
Pin Configuration
Pin No. Function Pin No. Function
1 GND 17 N/C
2 C16 18 N/C
3 C8 19 N/C
4 C4 20 N/C
5 C2 21 N/C
6 GND 22 N/C
7 GND 23 N/C
8 N/C 24 N/C
9 N/C 25 N/C
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.
Recommended PCB Layout 2
2. Application Note C2083 is available on line at
www.macom.com
Absolute Maximum Ratings 3
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
Ordering Information
Part Number Package
AT90-0233 Bulk Packaging
AT90-0233TR Tape and Reel (1K Reel)
AT90-0233-TB Units Mounted on Test Board
Parameter Absolute Maximum
Max. Input Power
0.05 GHz
0.5 - 2.5 GHz
+Vcc +5.5V
-Vee -8.5V
Logic Voltages 4 -0.5 to +Vcc + 0.5V
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +125°C
3. Operation of this device above any one of these
parameters may cause permanent damange.
4. Standard CMOS TTL interface, latch-up will occur if logic
signal is applied prior to power supply.
+27 dBm
+34 dBm
Specifications subject to change without notice.
n North America: Tel. (800) 366-2266
n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.
2
Page 3
Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz
Input
Output
Typical Performance Curves
VSWR @ Insertion Loss Insertion Loss
AT90-0233
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. (800) 366-2266
n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
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
Page 4
Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz
Typical Performance Curves
AT90-0233
V 1.00
0.50
0.00
-0.50
Attenuation (dB)
-1.00
-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. (800) 366-2266
n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
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
4
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