Digital Attenuator, 50 dB, 6-Bit,
TTL Driver, DC - 2 GHz
AT20-0106
CR-13
V 5.00
Features
nAttenuation: 1 dB steps to 50 dB
nTemperature Stability: ± 0.18 dB from –40°C to +85°C
Typical
nLow DC Power Consumption
nSurface Mount Package
nIntegral TTL Driver
nHigh Intercept Point
nLow Cost/High Performance
n50 Ohm Nominal Impedance
Description
M/A-COM’s AT20-0106 is a GaAs FET 6-bit digital
attenuator with a 1 dB minimum step size and 50 dB total
attenuation. This attenuator and integral TTL driver is in a
ceramic 24-lead surface mount package. The AT20-0106 is
ideally suited for use where accuracy, fast switching, 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. Available with enhanced performance as
fully hermetic version. Environmentally screenable as P/N
AT-106.
Electrical Specifications: TA = 25°C1
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
—
—
—
3.0
3.5
4.0
3.6
4.1
4.6
Attenuation Accuracy 2 Any Single Bit
Any Combination of Bits
(For attenuation to 26 dB)
Any Combination of Bits
(For attenuation 27 to 50 dB)
DC - 2.0 GHz
DC - 2.0 GHz
DC - 1.5 GHz
dB
dB
dB
± (0.3 +4% of atten. setting)
± (0.4 +4% of atten. setting)
± (0.5 +5% of atten. setting)
VSWR — 0.05 - 0.10 GHz
0.101 - 2.0 GHz Ratio
Ratio —
— —
— 2.0:1
1.8:1
Trise, Tfall 10% to 90% — ns — — 50
Ton, Toff 50% Control to 90/10% RF — ns — — 150
Transients In-Band (peak-peak) — mV — 50 —
1 dB Compression Input Power
Input Power 0.05 GHz
0.5 - 2.0 GHz dBm
dBm —
— +20
+28 —
—
Input IP3 For two-tone Input Power
Up to +5 dBm 0.05 GHz
0.5 - 2.0 GHz dBm
dBm —
— +34
+46 —
—
Input IP2 For two-tone Input Power
Up to +5 dBm 0.05 GHz
0.5 - 2.0 GHz dBm
dBm —
— +75
+79 —
—
Vcc — — V 4.5 5.0 5.5
Vee — — V -8.0 — -5.0
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, 50 dB, 6-Bit, TTL Driver, DC - 2 GHz AT20-0106
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 5.00
2
Parameter Test Conditions Frequency Units Min Typ Max
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
Electrical Specifications: TA = 25°C
Absolute Maximum Ratings 3
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.
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
Control Voltage 4 -0.5V to Vcc +0.5V
Operating Temperature -40°C to +125°C
Storage Temperature -65°C to +150°C
Truth Table
C6 C5 C4 C3 C2 C1 Attenuation
0 0 0 0 0 0 Reference
0 0 0 0 0 1 1 dB
0 0 0 0 1 0 2 dB
0 0 0 1 0 0 4 dB
0 0 1 0 0 0 8 dB
0 1 0 0 0 0 16 dB
1 0 0 0 0 0 32 dB
1 1 1 1 1 1 63 dB
Control Inputs
Functional Schematic (Top View)
PIN 1 GND
GND
GND
C32
C16
Vee (-5V to -8V)
Vcc (+5V)
C8
GND
GND
GND
GND
GND
GND
RF1 PIN 24
32 dB
16 dB
8 dB
4 dB
2 dB
1 dB
GND
GND
GND Orientation Mark
GND
RF2 PIN 13
C4
C2
C1
PIN 12 GND
0 = TTL Low 1 = TTL High
Digital Attenuator, 50 dB, 6-Bit, TTL Driver, DC - 2 GHz AT20-0106
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 5.00
Typical Performance Curves
3
Ordering Information
Part Number Package
AT20-0106 PIN CR-13
Attenuation Accuracy vs. Frequency Insertion Loss vs. Frequency
Attenuation Accuracy vs. Frequency RF1 VSWR vs. Frequency
RF2 VSWR vs. Frequency
0
1
2
3
4
5
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
Insertion Loss (dB)
+85°C +25°C -55°C
-0.60
-0.40
-0.20
0.00
0.20
0.40
0.60
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
Deviation from Nominal Atten
(dB)
1 dB 2 dB 4 dB 8 dB
-2.00
-1.00
0.00
1.00
2.00
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
Deviation from Nominal Atten (dB)
16 dB 32 dB 40 dB 50 dB
1
1.2
1.4
1.6
1.8
2
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
VSWR
1 dB4 dB 8 & 16 dB32 dBRef Loss & 2 dB
1
1.2
1.4
1.6
1.8
2
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
VSWR
1 dB2 dB8 dB 16 dB Ref Loss
& 4 dB 32 dB
