MA-COM AT

AT-107
Digital Attenuator, 31.5 dB, 6-Bit,
TTL Driver, DC - 2 GHz
Features
V 4.00
CR-13
n Attenuation: 1 dB steps to 31.5 dB
n Temperature Stability: ± 0.18 dB from –55°C to +85°C
n
n
n
n
Typical
Low DC Power Consumption
Hermetic Surface Mount Package
Integral TTL Driver
50 Ohm Nominal Impedance
Description
M/A-COM’s AT-107 is a GaAs FET 6-bit digital attenuator
with a 1 dB minimum step size and 31.5 dB total
attenuation. This attenuator and integral TTL driver is in a
hermetically sealed ceramic 24-lead surface mount package.
The AT-107 is ideally suited for use where accuracy, fast
switching, very low power consumption and low
intermodulation products are required. Typical applications
include dynamic range setting in precision receiver circuits
and other gain/leveling control circuits. Environmental
screening is available. Contact the factory for information.
Electrical Specifications: TA = -55°C to +85°C 1
Parameter
Test Conditions
Frequency
Units
Min
Typ
Max
Reference Insertion Loss
—
DC - 0.5 GHz
DC - 1.0 GHz
DC - 2.0 GHz
dB
dB
dB
—
—
—
—
—
—
3.2
3.6
4.0
Attenuation Accuracy 2
Any Single Bit
DC - 1.0 GHz
DC - 2.0 GHz
DC - 1.0 GHz
Any Combination of Bits
DC - 2.0 GHz
± (0.15 +3% of atten. setting in dB) dB
± (0.2 +3% of atten. setting in dB) dB
± (0.2 +3% of atten. setting in dB) dB
or ± 0.4 dB, whichever is greater
± (0.2 +3% of atten. setting in dB) dB
or ± 0.4 dB, whichever is greater
VSWR
—
DC - 2.0 GHz
Ratio
—
—
1.8:1
Trise, Tfall
10% to 90%
—
ns
—
9
—
Ton, Toff
50% Control to 90/10% RF
—
ns
—
45
—
Transients
In-Band (peak-peak)
—
mV
—
40
—
1 dB Compression
Input Power
Input Power
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
—
—
+21
+29
—
—
Input IP3
For two-tone Input Power
Up to +5 dBm
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
—
—
+35
+48
—
—
Input IP2
For two-tone Input Power
Up to +5 dBm
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
—
—
+75
+79
—
—
1. All specifications apply when operated with bias voltages of +5V for Vcc and –5.0V for Vee.
2. This attenuator is guaranteed monotonic.
Digital Attenuator, 31.5 dB, 6-Bit, TTL Driver, DC - 2 GHz
AT-107
V 4.00
Electrical Specifications: TA = -55°C to +85°C
Parameter
Test Conditions
Frequency
Units
Min
Typ
Max
Vcc
—
—
V
4.5
5.0
5.5
Vee
—
—
V
-8.0
—
-5.0
Icc
Vcc = 4.5 to 5.5V
Vctl = 0 to 0.8V, or Vcc –2.1V to Vcc
—
mA
—
—
6.0
Iee
Vee = -5.0 to -8.0V
—
mA
—
—
1.0
Vctl
Vctl
Logic 0 (TTL)
Logic 1 (TTL)
—
—
V
V
0.0
2.0
—
—
0.8
5.0
Input Leakage Current (Low)
0 to 0.8V
—
µA
—
—
1.0
Input Leakage Current (High)
2.0 to 5.0V
—
µA
—
—
1.0
Absolute Maximum Ratings 3
Parameter
Absolute Maximum
Max Input Power
0.5 GHz
0.5 - 2.0 GHz
+27 dBm
+34 dBm
Supply Voltages
Vcc
Vee
+5.5V
-8.5V
Truth Table
Control Inputs
C6
C5
C4
C3
C2
C1
Attenuation
0
0
0
0
0
0
Reference
0
0
0
0
0
1
0.5 dB
0
0
0
0
1
0
1 dB
-0.5V to Vcc +0.5V
0
0
0
1
0
0
2 dB
Operating Temperature
-55°C to +125°C
0
0
1
0
0
0
4 dB
Storage Temperature
-65°C to +150°C
0
1
0
0
0
0
8 dB
1
0
0
0
0
0
16 dB
1
1
1
1
1
1
31.5 dB
Control Voltage
4
3. Operation of this device above any one of these parameters
may cause permanent damage.
4. Standard CMOS TTL interface, latch-up will occur if logic
signal is applied prior to power supply.
0 = TTL Low
1 = TTL High
Functional Schematic (Top View)
RF1 PIN 24
PIN 1 GND
GND
16 dB
GND
GND
GND
8 dB
C16
GND
C8
GND
4 dB
Vee (-5V to -8V)
GND
Vcc (+5V)
GND
2 dB
GND
C4
C2
1 dB
C1
C0.5
GND
GND Orientation Mark
0.5 dB
PIN 12 GND
GND
RF2 PIN 13
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
Digital Attenuator, 31.5 dB, 6-Bit, TTL Driver, DC - 2 GHz
AT-107
V 4.00
Typical Performance Curves
Insertion Loss vs. Frequency
+25°C
Attenuation Accuracy vs. Frequency
-55°C
1 dB
Deviation from Nominal Atten (dB)
+85°C
Insertion Loss (dB)
5.0
4.0
3.0
2.0
1.0
0.0
0.0
0.5
1.0
1.5
4 dB
0.40
0.20
0.00
-0.20
-0.40
-0.60
2.0
0.0
0.5
1.5
2.0
RF1 VSWR vs. Frequency
Attenuation Accuracy vs. Frequency
16 dB
1 dB
31.5 dB
0.80
4 dB
8 & 16 dB
Ref Loss & 0.5 dB
2
1.8
0.40
VSWR
Deviation from Nominal Atten (dB)
1.0
Frequency (GHz)
Frequency (GHz)
8 dB
0.5 dB
2 dB
0.60
0.00
-0.40
1.6
1.4
1.2
1
-0.80
0.0
0.5
1.0
1.5
2.0
0.0
0.5
Frequency (GHz)
RF2 VSWR vs. Frequency
1 & 2 dB
4 dB
8 dB
16 dB
1.0
1.5
2.0
Frequency (GHz)
Ordering Information
Ref Loss & 0.5 dB
2
Part Number
Package
AT-107 PIN
CR-13
VSWR
1.8
1.6
1.4
1.2
1
0.0
0.5
1.0
1.5
2.0
Frequency (GHz)
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.
3