Digital Attenuator, 30 dB, 4-Bit,
TTL Driver, DC - 2.5 GHz
AT90
-
1233
CSP-1
V 1.00
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
T
A
= +25C
Parameter
Test Conditions
Frequency
Units
Min
Typical
Max
Insertion Loss
--
DC - 2.5 GHz
dB
--
2.7
3.0
Attenuation
Accuracy
Individual Bits or Combination
of Bits
DC - 2.5 GHz
dB
--
--
(.3 +5% of atten setting)
VSWR
Full Range
DC - 2.5 GHz
Ratio
--
1.5:1
1.8:1
Switching Speed
50% Cntl to 90%/10% RF
10% to 90% or 90% to 10%
--
--
nS
nS
--
--
75
20
150
50
1 dB Compression
--
--
50 MHz
0.5 - 2.5 GHz
dBm
dBm
--
--
+21
+29
--
--
Input IP
3
Two-tone inputs up to +5 dBm
50 MHz
0.5 - 2.5 GHz
dB
dB
--
--
+35
+48
--
--
+Vcc
--
--
V
4.75
5.0
5.25
Logic "0"
Sink Current is 20 A max.
--
V
0.0
--
0.8
Logic "1"
Source Current is 20 A max.
--
V
2.0
--
5.0
Icc
Vcc min to max,
Logic "0" or "1"
--
mA
--
6
10
Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz
AT90-1233
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.
V 1.00
2
Recommended PCB Layout
7
7. Application Note C2083 is available on line at
www.macom.com
Pin Configuration
Pin No.
Function
Pin No.
Function
1
GND
17
N/C
2
C16
18
N/C
3
C8
19
+V
CC
2
4
C4
20
N/C
5
C2
21
Cp
4
6
GND
22
N/C
7
GND
23
Cp
4
8
N/C
24
N/C
9
N/C
25
-V
EE
3
10
N/C
1
26
GND
11
GND
27
RF2
12
RF1
28
GND
13
GND
29
N/C
1
14
N/C
30
-V
EE
3,5
15
N/C
31
N/C
16
N/C
32
+V
CC
2,6
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 F cap must be connected between Pins 21 and 23.
5. -V
EE
is produced internally and requires a .1 F cap to GND.
6. +V
CC
requires a .1 F cap to GND.
Absolute Maximum Ratings
8
Parameter
Absolute Maximum
Max. Input Power
0.05 GHz
0.5 - 2.5 GHz
+27 dBm
+34 dBm
+Vcc
+5.5V
-Vee
-8.5V
Logic Voltages
9
-0.5 to +Vcc + 0.5V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +125C
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.
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
Truth Table
Ordering Information
Part Number
Package
AT90-1233
Bulk Packaging
AT90-1233TR
Tape and Reel (1K Reel)
AT90-1233-TB
Units Mounted on Test Board
0 = TTL Low; 1 = TTL High
Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz
AT90-1233
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.
V 1.00
3
3
Typical Performance Curves
VSWR @ Insertion Loss
Insertion Loss
Attenuation Error, 2 dB Bit
Attenuation Error, 4 dB Bit
Attenuation Error, 8 dB Bit
Attenuation Error, 16 dB Bit
1.00
1.20
1.40
1.60
0
500
1000
1500
2000
2500
Frequency (MHz)
VSWR
Input
Output
1.00
1.50
2.00
2.50
3.00
0
500
1000
1500
2000
2500
Frequency (MHz)
Attenuation (dB)
-0.30
-0.20
-0.10
0.00
0.10
0.20
0.30
0
500
1000
1500
2000
2500
Frequency (MHz)
Attenuation (dB)
-0.40
-0.20
0.00
0.20
0.40
0
500
1000
1500
2000
2500
Frequency (MHz)
Attenuation (dB)
-0.40
-0.20
0.00
0.20
0.40
0
500
1000
1500
2000
2500
Frequency (MHz)
Attenuation (dB)
-0.80
-0.60
-0.40
-0.20
0.00
0
500
1000
1500
2000
2500
Frequency (MHz)
Attenuation (dB)
Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz
AT90-1233
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.
V 1.00
4
Typical Performance Curves
VSWR, 2 dB Bit
Attenuation Error, Max. Attenuation
VSWR, 4 dB Bit
VSWR, 8 dB Bit
VSWR, 16 dB Bit
VSWR, Maximum Attenuation
1.00
1.20
1.40
1.60
0
500
1000
1500
2000
2500
Frequency (MHz)
VSWR
Output
Input
1.00
1.20
1.40
1.60
0
500
1000
1500
2000
2500
Frequency (MHz)
VSWR
Output
Input
1.00
1.20
1.40
1.60
0
500
1000
1500
2000
2500
Frequency (MHz)
VSWR
Output
Input
1.00
1.20
1.40
1.60
0
500
1000
1500
2000
2500
Frequency (MHz)
VSWR
Output
Input
1.00
1.20
1.40
1.60
0
500
1000
1500
2000
2500
Frequency (MHz)
VSWR
Output
Input
-1.50
-1.00
-0.50
0.00
0.50
0
500
1000
1500
2000
2500
Frequency (MHz)
Attenuation (dB)
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