Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579 Email sales@alphaind.com www.alphaind.com
1
Specifications subject to change without notice. 11/00A
GaAs IC 5 Bit Digital Attenuator
0.5 dB LSB DC2 GHz
Features
I Attenuation 0.5 dB Steps to 15.5 dB
with High Accuracy
I Low DC Power Consumption
I Low Cost SOIC-16 Plastic Package
SOIC-16
AA280-25
(Previously AD280-25)*
0.158 (4.00 mm)
0.150 (3.80 mm)
0.068
(1.73 mm) MAX.
0.244 (6.20 mm)
0.228 (5.80 mm)
0.049 (1.24 mm)
0.016 (0.41 mm)
0.016 MAX.
(0.41 mm)
x 45
CHAMFER
0.020 (0.51 mm)
0.013 (0.33 mm)
0.050
(1.27 mm) BSC
PIN 16
PIN 1
PIN 1
INDICATOR
0.394 (10.00 mm)
0.386 (9.80 mm)
0.010 (0.25 mm)
0.004 (0.10 mm)
0.0098 (0.25 mm)
0.0075 (0.19 mm)
8 MAX.
Description
The AD280-25 is a 5 bit, GaAs IC FET digital attenuator
in a low cost SOIC-16 package. This attenuator has an
LSB of 0.5 dB and a total attenuation of 15.5 dB.
The AD280-25 is particularly suited where high
attenuation accuracy, low insertion loss and low
intermodulation products are required. Typical applications
include cellular radio, wireless data, wireless local loop and
other gain level control circuits.
Parameter
1
Condition
Frequency
2
Min.
Typ.
Max.
Unit
Insertion Loss
3
DC0.5 GHz
1.1
1.3
dB
DC1.0 GHz
1.4
1.7
dB
DC2.0 GHz
1.7
2.0
dB
Attenuation Range
15.5
dB
Attenuation Accuracy
3
DC1.0 GHz
(0.2 + 3% of
Attenuation Setting in dB)
dB
DC2.0 GHz
(0.4 + 3% of
Attenuation Setting in dB)
dB
VSWR (I/O
)4
DC2.0 GHz
1.4:1
1.8:1
Switching Characteristics
5
Rise, Fall (10/90% or 90%/10% RF)
15
nS
On, Off (50% CTL to 90%/10% RF)
25
nS
Video Feedthru
25
mV
Input Power for 1 dB Compression
0.52.0 GHz
+24
+29
dBm
0.05 GHz
+17
+22
dBm
Intermodulation Intercept Point (IP3)
For Two-tone Input Power +5 dBm
0.52.0 GHz
+44
+50
dBm
0.05 GHz
+35
+40
dBm
Control Voltages
V
Low
= 0 to 0.2 V @ 20
A Max.
V
High
= -5 V @ 300
A Max.
Electrical Specifications at -40C to +85C (0, -5 V)
1. All measurements made in a 50
system, unless otherwise specified.
2. DC = 300 kHz.
3. Attenuation referenced to insertion loss.
4. Input/Output
5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
*Due to conflict with another company's product numbering system, Alpha's attenuator products starting with the letters "AD" are being changed to "AA".
GaAs IC 5 Bit Digital Attenuator 0.5 dB LSB DC2 GHz
AA280-25
2
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579 Email sales@alphaind.com www.alphaind.com
Specifications subject to change without notice. 11/00A
Insertion Loss (dB)
Frequency (GHz)
Insertion Loss vs. Frequency
0
0.5
1.0
1.5
2.0
-2.00
-1.75
-1.50
-1.25
-1.00
-0.75
-0.50
+25C
+85C
-40C
IP3 (dBm)
Attenuation (dB)
IP3 vs. Attenuation and Temperature
46
48
50
52
54
56
58
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+25C
+85C
-40C
VSWR
Frequency (GHz)
VSWR vs. Frequency (25C)
0
0.5
1.0
1.5
2.0
1.0
1.1
1.2
1.3
1.4
1.5
Ins. Loss
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
VSWR
Frequency (GHz)
VSWR vs. Frequency (85C)
0
0.5
1.0
1.5
2.0
1.0
1.1
1.2
1.3
1.4
1.5
Ins. Loss
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
VSWR
Frequency (GHz)
VSWR vs. Frequency (-40C)
0
0.5
1.0
1.5
2.0
1.0
1.1
1.2
1.3
1.4
1.5
Ins. Loss
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Typical Performance Data (0, -5 V)
Compression Point vs. Attenuation,
Voltage, and Temperature
Attenuation
Control
Input Power @ 1 dB Compression
State
Voltage (V) +25C (dBm) +85C (dBm) -40C (dBm)
Ins. Loss
-5
28.30
28.10
29.10
0.5 dB
-5
28.50
28.30
29.40
1.0 dB
-5
28.70
28.70
29.60
2.0 dB
-5
28.40
28.30
29.10
4.0 dB
-5
32.90
32.90
33.90
8.0 dB
-5
36.80
36.80
36.80
15.5 dB
-5
32.70
32.10
32.80
GaAs IC 5 Bit Digital Attenuator 0.5 dB LSB DC2 GHz
AA280-25
3
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579 Email sales@alphaind.com www.alphaind.com
Specifications subject to change without notice. 11/00A
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (25C)
0
0.5
1.0
1.5
2.0
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (85C)
0
0.5
1.0
1.5
2.0
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Deviation from Nominal
Insertion Phase (Deg.)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (25C)
0
0.5
1.0
1.5
2.0
-5
0
5
10
15
20
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Deviation from Nominal
Insertion Phase (Deg.)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (85C)
0
0.5
1.0
1.5
2.0
-5
0
5
10
15
20
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (-40C)
0
0.5
1.0
1.5
2.0
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Deviation from Nominal
Insertion Phase (Deg.)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (-40C)
0
0.5
1.0
1.5
2.0
-5
0
5
10
15
20
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
GaAs IC 5 Bit Digital Attenuator 0.5 dB LSB DC2 GHz
AA280-25
4
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579 Email sales@alphaind.com www.alphaind.com
Specifications subject to change without notice. 11/00A
Insertion Loss (dB)
Frequency (GHz)
Insertion Loss vs. Frequency
0
0.5
1.0
1.5
2.0
-2.00
-1.75
-1.50
-1.25
-1.00
-0.75
-0.50
+25C
85C
-40C
VSWR vs. Frequency (25C)
VSWR
Frequency (GHz)
0
0.5
1.0
1.5
2.0
1.0
1.1
1.2
1.3
1.4
1.5
Ins. Loss
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (25C)
0
0.5
1.0
1.5
2.0
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (85C)
0
0.5
1.0
1.5
2.0
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Deviation from Nominal
Insertion Phase (Deg.)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (25C)
0
0.5
1.0
1.5
2.0
-5
0
5
10
15
20
25
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Deviation from Nominal
Attenuation (dB)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (-40C)
0
0.5
1.0
1.5
2.0
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Typical Performance Data (0, -3 V)
GaAs IC 5 Bit Digital Attenuator 0.5 dB LSB DC2 GHz
AA280-25
5
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579 Email sales@alphaind.com www.alphaind.com
Specifications subject to change without notice. 11/00A
Truth Table
V
8
V
7
V
6
V
5
V
4
V
3
V
2
V
1
J
1
GND GND GND GND GND GND
J
2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
8 dB
4 dB
2 dB
1 dB 0.5 dB
Characteristic
Value
RF Input Power
2.0 W > 500 MHz 0/-8 V
0.5 W > 50 MHz 0/-8 V
Control Voltage
+0.2 V, -8 V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +150C
JC
85C/W
Absolute Maximum Ratings
Pin Out
Note: Exceeding these ratings may cause irreversible damage.
V
1
V
2
V
3
V
4
V
5
V
6
V
7
V
8
0.5 dB
1 dB
2 dB
4 dB
8 dB
Bit
Bit
Bit
Bit
Bit
-5
-5
-5
0
-5
0
-5
0
Reference I.L.
0
-5
-5
0
-5
0
-5
0
0.5 dB
-5
0
-5
0
-5
0
-5
0
1 dB
-5
-5
0
-5
-5
0
-5
0
2 dB
-5
-5
-5
0
0
-5
-5
0
4 dB
-5
-5
-5
0
-5
0
0
-5
8 dB
0
0
0
-5
0
-5
0
-5
15.5 dB
Max. Atten.
Attenuation
J
1
J
2
IP3 (dBm)
Attenuation (dB)
IP3 vs. Attenuation and Temperature
47
48
49
50
51
52
53
54
55
56
57
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+25C
+85C
-40C
Compression Point vs. Attenuation,
Voltage, and Temperature
Attenuation
Control
Input Power @ 1 dB Compression
State
Voltage (V) +25C (dBm) +85C (dBm) -40C (dBm)
Ins. Loss
-3
22.70
23.30
24.20
0.5 dB
-3
23.50
24.20
25.10
1.0 dB
-3
24.60
25.00
25.90
2.0 dB
-3
22.90
23.40
24.30
4.0 dB
-3
31.60
31.80
33.10
8.0 dB
-3
31.00
28.70
26.40
15.5 dB
-3
25.00
24.40
25.00
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