Alpha Industries, Inc. [781] 935-5150
· Fax [617] 824-4579 · Email sales@alphaind.com · www.alphaind.com
1
Specifications subject to change without notice. 3/01A
GaAs IC 5 Bit Digital Attenuator With
Serial-to-Parallel Driver 0.52.5 GHz
Features
I Positive Voltage Operation (+5 V)
I MLF 5 x 5 mm Leadless Package
I Integrated Silicon Serial-to-Parallel Driver
I Attenuation 1 dB Steps to 31 dB
MLF 5 x 5 (-310)
AA109-310
Description
The AA109-310 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 where
high attenuation accuracy, low insertion loss and low
intermodulation products are required. Typical applications
include base station, wireless and wireless local loop gain
control circuits.
Parameter
1
Condition
Frequency
Min.
Typ.
Max.
Unit
Insertion Loss
2
0.51.0 GHz
2.0
2.4
dB
1.02.0 GHz
2.7
3.1
dB
2.02.5 GHz
3.1
3.6
dB
Attenuation Range
3, 4
15.5
dB
Attenuation Accuracy
3, 4
0.51.0 GHz
± (0.2 + 3% of
Attenuation Setting in dB)
dB
1.02.0 GHz
± (0.3 + 5% of
Attenuation Setting in dB)
dB
2.02.5 GHz
± (0.3 + 6% of
Attenuation Setting in dB)
dB
VSWR (I/O)
0.52.5 GHz
1.5:1
2.2:1
Switching Characteristics
5
Rise, Fall (10/90% or 90/10% RF)
100
µs
On, Off (50% CTL to 90/10% RF)
300
µs
Video Feedthru
70
mV
Input Power for 1 dB Compression
V
S
= +3 V
0.92.5 GHz
+21
dBm
V
S
= +5 V
0.92.5 GHz
+27
dBm
Intermodulation Intercept Point (IP3)
For Two-tone Input Power +5 dBm
V
S
= +3 V
0.92.5 GHz
+41
dBm
V
S
= +5 V
0.92.5 GHz
+45
dBm
Electrical Specifications at 25°C (V
CC
= +5 V)
0.001
(0.025 mm)
0.039 (1.00 mm) MAX.
SEATING
PLANE
12° MAX.
0.197 (5.00 mm) BSC
0.197
(5.00 mm)
BSC
1
32
0.187
(4.75 mm) BSC
0.187
(4.75 mm)
BSC
PIN 1
INDICATOR
0.122 (3.10 mm)
± 0.006 (0.15 mm)
0.122 (3.10 mm)
± 0.006 (0.15 mm)
32
1
0.138 (3.50 mm) REF.
0.138
(3.50 mm) REF.
0.019 (0.50 mm) BSC
Preliminary
Parameter
Symbol
Min.
Typ.
Max.
Unit
Input Voltage High
V
IH
(1)
3.5
5.0
V
Input Voltage Low
V
IL
(0)
0
0.5
V
Input Leakage Current
I
L
±0.5
µA
Quiescent Current
I
CC
500
µA
Supply Voltages
V
CC
5.0
V
DC Electrical Characteristics at 25°C (0, +5 V)
1. All measurements made in a 50
system, unless otherwise specified.
2. Insertion loss changes by 0.003 dB/°C.
3. Attenuation value referenced above insertion loss.
4. Exposed pad must be connected to RF ground to obtain specified attenuation.
5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
GaAs IC 5 Bit Digital Attenuator With Serial-to-Parallel Driver 0.52.5 GHz
AA109-310
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
Dimensions in inches (mm).
0.122
(3.10 mm)
SQ.
0.020 (0.50 mm)
0.020
(0.50 mm)
0.020 (0.50 mm)
0.020
(0.50 mm)
0.013 (0.33 mm)
Surface Mount Land Pattern
5 x 5 mm MLF 32 Lead
Truth Table
J
1
J
2
Reset
1 dB
2 dB
4 dB
8 dB
16 dB
Attenuation
1
1
1
1
1
1
Insertion Loss
1
0
1
1
1
1
1 dB
1
1
0
1
1
1
2 dB
1
1
1
0
1
1
4 dB
1
1
1
1
0
1
8 dB
1
1
1
1
1
0
16 dB
1
0
0
0
0
0
31 dB
0
X
X
X
X
X
31 dB
Characteristic
Value
Supply Voltage (V
CC
)
-0.5 to +6 V
Input Voltage (V
I
)
-0.5 V
CC
+ 0.5 V
Power Dissipation (P
D
)
500 mW
Storage Temperature (T
ST
)
-65°C to +125°C
Operating Temperature (T
OP
)
-40°C to +85°C
Absolute Maximum Ratings
Typical Performance Data (V
CC
= +5 V)
Insertion Loss vs. Frequency
Frequency (GHz)
Insertion Loss (dB)
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0
0.5
1.0
1.5
2.0
2.5
Frequency (GHz)
Attenuation Accuracy vs. Frequency
0
0.5
1.0
1.5
2.0
2.5
Deviation from Nominal
Attenuation (dB)
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
VSWR vs. Frequency
Frequency (GHz)
VSWR
1.0
1.2
1.4
1.6
1.8
2.0
2.2
0
0.5
1.0
1.5
2.0
2.5
Ins. Loss
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
Serial Data Input
V
IL
(0) = 0 to 0.5 V.
V
IH
(1) = 3.5 to 5 V.
X = Don't Care.
GaAs IC 5 Bit Digital Attenuator With Serial-to-Parallel Driver DC2.5 GHz
AA109-310
Alpha Industries, Inc. [781] 935-5150
· Fax [617] 824-4579 · Email sales@alphaind.com · www.alphaind.com
3
Specifications subject to change without notice. 3/01A
J
1
LE
0.01
µ
F
GND
SCK
V
CC
GND
GND
GND
GND
GND
GND
GND
GND
GND
Pin 1
Pin 32
GND
GND
GND
GND
GND
J
2
GND
GND
GND
GND
GND
GND
GND
GND
S
Out
RST
GND
SDA
V
cc
10 k
47 pF
47 pF
Pin Out
Pin
Symbol
Function
14
GND
Ground
5
J
1
RF Input/Output
619
GND
Ground
20
J
2
RF Input/Output
2125
GND
Ground
26
V
CC
Supply Voltage
27
SCK
Serial Clock Input
28
SDA
Serial Data Input
29
LE
Latch Enable
30
RST
Reset
31
GND
Ground
32
S
Out
Serial Data Output
Parameter
Symbol
Min.
Typ.
Max.
Unit
LE Setup Time
T
1
15
ns
SDA Setup Time
T
2
15
ns
SDA Hold Time
T
3
10
ns
LE Hold Time
T
4
10
ns
Clock Period
T
5
60
ns
Timing Diagram
LE
SCK
SDA
T
1
T
2
T
3
T
5
T
4
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