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GaAs IC 5 Bit Digital Attenuator With
Serial-to-Parallel Driver DC–2 GHz
Preliminary
AA107-310
Features
I Positive Voltage Operation (+5 V)
I MLF 5 x 5 mm Leadless Package
I Integrated Silicon Serial-to-Parallel Driver
I Attenuation 0.5 dB Steps to 15.5 dB
Description
The AA107-310 is a GaAs FET IC 5 bit digital attenuator
with a serial-to-parallel driver packaged in a 32 leadless
exposed pad plastic package. It is particularly suited at IF
frequencies where high attenuation accuracy, low insertion
loss and low intermodulation products are required.Typical
applications include base station, wireless and RF data and
wireless local loop gain control circuits.
MLF 5 x 5 (-310)
0.197 (5.00 mm) BSC
0.039 (1.00 mm) MAX.
PIN 1
INDICATOR
32
0.187
(4.75 mm) BSC
0.001
(0.025 mm)
1
0.187
(4.75 mm)
BSC
0.197
(5.00 mm)
BSC
SEATING
PLANE
0.122 (3.10 mm)
± 0.006 (0.15 mm)
12˚ MAX.
0.122 (3.10 mm)
± 0.006 (0.15 mm)
32
1
0.138
(3.50 mm) REF.
0.019 (0.50 mm) BSC
0.138 (3.50 mm) REF.
Electrical Specifications at 25°C (VCC = +5 V)
Parameter1
Condition
Insertion Loss3
Attenuation Range4, 5
Attenuation Accuracy4, 5
VSWR (I/O)
Switching Characteristics6
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
For Two-tone Input Power +5 dBm
VLow = 0 to 0.2 V @ 20 µA Max.
VHigh = -5 V @ 300 µA Max.
Frequency2
DC–1.0 GHz
DC–2.0 GHz
DC–1.0 GHz
DC–2.0 GHz
DC–2.0 GHz
0.50–2.0 GHz
0.05 GHz
0.50–2.0 GHz
0.05 GHz
Min.
Typ. Max.
1.4 1.7
1.7 2.2
15.5
± (0.2 + 3% of
Attenuation Setting in dB)
± (0.4 + 3% of
Attenuation Setting in dB)
1.4:1 1.8:1
50
100
50
+24 +29
+17 +22
+44 +50
+35 +40
Unit
dB
dB
dB
dB
dB
ns
ns
mV
dBm
dBm
dBm
dBm
DC Electrical Characteristics at 25°C (VCC = +5 V)
Parameter
Symbol
Min.
Typ. Max. Unit
Input Voltage High
Input Voltage Low
Input Leakage Current
Quiescent Current
Supply Voltages
1. All measurements made in a 50 system, unless otherwise specified.
2. DC = 300 kHz.
3. Insertion loss changes by 0.003 dB/°C.
VIH (1)
3.5 5.0
V
VIL (0)
0 0.5
V
IL ±0.5 µA
ICC 500 µA
VCC 5.0 V
4. Attenuation value referenced above insertion loss.
5. Exposed pad must be connected to RF ground to obtain specified attenuation.
6. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
Alpha Industries, Inc. [781] 935-5150 Fax [617] 824-4579 Email sales@alphaind.com www.alphaind.com
Specifications subject to change without notice. 3/01A
1

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GaAs IC 5 Bit Digital Attenuator With Serial-to-Parallel Driver DC–2 GHz
AA107-310
Typical Performance Data (VCC = +5 V)
0
-0.5
-1.0
-1.5
-2.0
0
0.5 1.0 1.5 2.0
Frequency (GHz)
Insertion Loss vs. Frequency
0.2
0
-0.2 8 dB
-0.4
-0.6
4 dB 2 dB
0.5 dB
1 dB
15.5 dB
-0.8
-1.0
0
0.5 1.0
1.5 2.0
Frequency (GHz)
Attenuation Accuracy vs. Frequency
Truth Table
Serial Data Input
Reset 0.5 dB 1 dB 2 dB 4 dB
1 00 00
1 10 00
1 01 00
1 00 10
1 00 01
1 00 00
1 11 11
0 XX XX
VIL (0) = 0 to 0.5 V.
VIH (1) = 3.5 to 5 V.
X = Dont Care.
8 dB
0
0
0
0
0
1
1
X
J1–J2
Attenuation
Insertion Loss
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Insertion Loss
1.5
1.4
1.3
1.2
1.1
1.0
0
2 dB
15.5 dB
0.5 dB
8 dB
Ins. Loss
1 dB
4 dB
0.5 1.0 1.5
Frequency (GHz)
VSWR vs. Frequency
2.0
Absolute Maximum Ratings
Characteristic
Supply Voltage (VCC)
Input Voltage (VI)
Power Dissipation (PD)
Storage Temperature (TST)
Operating Temperature (TOP)
Value
-0.5 to +6 V
-0.5 – VCC + 0.5 V
500 mW
-65°C to +125°C
-40°C to +85°C
Surface Mount Land Pattern
5 x 5 mm MLF 32 Lead
0.020 (0.50 mm) 0.013 (0.33 mm)
0.020
(0.50 mm)
0.020
(0.50 mm)
Dimensions in inches (mm).
0.122
(3.10 mm)
SQ.
0.020 (0.50 mm)
2 Alpha Industries, Inc. [781] 935-5150 Fax [617] 824-4579 Email sales@alphaind.com www.alphaind.com
Specifications subject to change without notice. 3/01A

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GaAs IC 5 Bit Digital Attenuator With Serial-to-Parallel Driver DC2 GHz
AA107-310
Pin Out
Pin 32
Pin 1
SOUT
GND
GND
GND
J1
GND
GND
GND
RST
GND
GND
GND
J2
GND
GND
GND
Timing Diagram
LE
Pin
1
24
5
619
20
2123
24
25
26
27
28
29
30
31
32
Symbol
SOUT
GND
J1
GND
J2
GND
RST
LE
SDA
SCK
VSS
GND
C2
C1
VCC
Function
Serial Data Output
Ground
RF Input/Output
Ground
RF Input/Output
Ground
Reset
Latch Enable
Serial Data Input
Serial Clock Input
Low Output Voltage Level
Ground
Charge Pump Capacitor
Charge Pump Capacitor
Supply Voltage
SCK
SDA
T1
T2 T3
LE Setup Time
SDA Setup Time
SDA Hold Time
LE Hold Time
Clock Period
Parameter
T5 T4
Symbol
T1
T2
T3
T4
T5
Min.
Typ.
15
15
10
10
60
Max.
Unit
ns
ns
ns
ns
ns
Alpha Industries, Inc. [781] 935-5150 Fax [617] 824-4579 Email sales@alphaind.com www.alphaind.com
Specifications subject to change without notice. 3/01A
3