ALPHA AA280

GaAs IC 5 Bit Digital Attenuator
0.5 dB LSB DC–2 GHz
AA280-25
(Previously AD280-25)*
Features
SOIC-16
■ Attenuation 0.5 dB Steps to 15.5 dB
with High Accuracy
0.050
(1.27 mm) BSC
PIN 16
■ Low DC Power Consumption
0.244 (6.20 mm)
0.228 (5.80 mm)
PIN 1
INDICATOR
■ Low Cost SOIC-16 Plastic Package
PIN 1
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.
0.020 (0.51 mm)
0.013 (0.33 mm)
0.068
(1.73 mm) MAX.
0.016 MAX.
(0.41 mm)
x 45˚
CHAMFER
0.049 (1.24 mm)
0.016 (0.41 mm)
8˚ MAX.
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)
0.158 (4.00 mm)
0.150 (3.80 mm)
Electrical Specifications at -40°C to +85°C (0, -5 V)
Parameter1
Insertion
Frequency2
Condition
Loss3
Min.
Typ.
Max.
Unit
DC–0.5 GHz
DC–1.0 GHz
DC–2.0 GHz
1.1
1.4
1.7
1.3
1.7
2.0
dB
dB
dB
DC–1.0 GHz
± (0.2 + 3% of
Attenuation Setting in dB)
± (0.4 + 3% of
Attenuation Setting in dB)
Attenuation Range
15.5
Attenuation Accuracy3
DC–2.0 GHz
VSWR (I/O)4
DC–2.0 GHz
Switching Characteristics5
Rise, Fall (10/90% or 90%/10% RF)
On, Off (50% CTL to 90%/10% RF)
Video Feedthru
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
1.4:1
For Two-tone Input Power +5 dBm
dB
dB
dB
1.8:1
15
25
25
nS
nS
mV
0.5–2.0 GHz
0.05 GHz
+24
+17
+29
+22
dBm
dBm
0.5–2.0 GHz
0.05 GHz
+44
+35
+50
+40
dBm
dBm
VLow = 0 to 0.2 V @ 20 µA Max.
VHigh = -5 V @ 300 µA Max.
1. All measurements made in a 50 Ω 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”.
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
1
GaAs IC 5 Bit Digital Attenuator 0.5 dB LSB DC–2 GHz
AA280-25
Typical Performance Data (0, -5 V)
-0.50
1.5
15.5 dB
1.4
-40˚C
8 dB
4 dB
-1.00
+85˚C
VSWR
Insertion Loss (dB)
-0.75
+25˚C
-1.25
1.2
-1.50
1 dB
0.5 dB
Ins. Loss
1.1
-1.75
-2.00
1.0
0
0.5
1.0
1.5
2.0
0
0.5
1.0
1.5
2.0
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
VSWR vs. Frequency (25˚C)
58
1.5
+25˚C
15.5 dB
56
8 dB
1.4
4 dB
+85˚C
54
VSWR
IP3 (dBm)
2 dB
1.3
-40˚C
52
2 dB
1.3
1.2
50
Ins. Loss
0.5 dB
1.1
48
1 dB
46
1.0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0
0.5
1.0
1.5
2.0
Attenuation (dB)
Frequency (GHz)
IP3 vs. Attenuation and Temperature
VSWR vs. Frequency (85˚C)
Compression Point vs. Attenuation,
Voltage, and Temperature
1.5
15.5 dB
Input Power @ 1 dB Compression
Attenuation Control
State
Voltage (V) +25°C (dBm) +85°C (dBm) -40°C (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
VSWR
1.4
8 dB
4 dB
1.3
2 dB
1.2
Ins. Loss
0.5 dB
1.1
1 dB
1.0
0
0.5
1.0
1.5
Frequency (GHz)
VSWR vs. Frequency (-40˚C)
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
2.0
GaAs IC 5 Bit Digital Attenuator 0.5 dB LSB DC–2 GHz
AA280-25
20
0.4
Deviation from Nominal
Insertion Phase (Deg.)
Deviation from Nominal
Attenuation (dB)
0.5
0.3
8 dB
0.2
4 dB
2 dB
0.1
0
-0.1
-0.2
15.5 dB
-0.3
1 dB
0.5 dB
15
15.5 dB
10
8 dB
0
-5
0
0.5
1.0
1.5
2.0
0
1.5
2.0
Attenuation Accuracy
vs. Frequency (25˚C)
Attenuation Phase Accuracy
vs. Frequency (25˚C)
20
Deviation from Nominal
Insertion Phase (Deg.)
Deviation from Nominal
Attenuation (dB)
1.0
Frequency (GHz)
0.4
0.3
8 dB
0.2
2 dB
4 dB
0.1
0
-0.1
-0.2
-0.3
15.5 dB
-0.4
1 dB
0.5 dB
15
15.5 dB
10
4 dB
8 dB
5
0
2 dB
1 dB
0.5 dB
-5
-0.5
0
0.5
1.0
1.5
0
2.0
0.5
1.0
1.5
2.0
Frequency (GHz)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (85˚C)
Attenuation Phase Accuracy
vs. Frequency (85˚C)
0.5
20
0.4
0.3
8 dB
0.2
4 dB
Deviation from Nominal
Insertion Phase (Deg.)
Deviation from Nominal
Attenuation (dB)
0.5
Frequency (GHz)
0.5
2 dB
0.1
0
0.5 dB
-0.1
-0.2
15.5 dB
-0.3
1 dB
15
15.5 dB
10
4 dB
5
0
0.5 dB
-0.4
-0.5
1 dB
8 dB
2 dB
-5
0
3
0.5 dB
1 dB
-0.4
-0.5
2 dB
4 dB
5
0.5
1.0
1.5
2.0
0
0.5
1.0
1.5
Frequency (GHz)
Frequency (GHz)
Attenuation Accuracy
vs. Frequency (-40˚C)
Attenuation Phase Accuracy
vs. Frequency (-40˚C)
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
2.0
GaAs IC 5 Bit Digital Attenuator 0.5 dB LSB DC–2 GHz
AA280-25
Typical Performance Data (0, -3 V)
0.5
Deviation from Nominal
Attenuation (dB)
-0.50
Insertion Loss (dB)
-0.75
-40˚C
-1.00
85˚C
-1.25
+25˚C
-1.50
-1.75
0.4
0.3
0.2
8 dB
0.1
4 dB
2 dB
0
-0.1
0.5 dB
1 dB
-0.2
15.5 dB
-0.3
-0.4
-0.5
-2.00
0
0.5
1.0
1.5
0
2.0
2.0
Attenuation Accuracy
vs. Frequency (25˚C)
Deviation from Nominal
Attenuation (dB)
15.5 dB
VSWR
1.5
Insertion Loss vs. Frequency
1.4
8 dB
1.3
4 dB
2 dB
1.2
Ins. Loss
0.5 dB
1.1
1 dB
1.0
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
-0.6
8 dB
4 dB
2 dB
0.5 dB
1 dB
15.5 dB
0
0.5
1.0
1.5
2.0
Frequency (GHz)
Frequency (GHz)
VSWR vs. Frequency (25˚C)
Attenuation Accuracy
vs. Frequency (85˚C)
25
0.5
20
15
15.5 dB
10
1 dB
4 dB
5
8 dB
0
2 dB
0.5 dB
Deviation from Nominal
Attenuation (dB)
Deviation from Nominal
Insertion Phase (Deg.)
1.0
Frequency (GHz)
1.5
0.4
0.3
0.2
8 dB
0.5 dB
4 dB
2 dB
0.1
0
-0.1
1 dB
-0.2
15.5 dB
-0.3
-0.4
-0.5
-5
0
4
0.5
Frequency (GHz)
0.5
1.0
1.5
2.0
0
0.5
1.0
1.5
Frequency (GHz)
Frequency (GHz)
Attenuation Phase Accuracy
vs. Frequency (25˚C)
Attenuation Accuracy
vs. Frequency (-40˚C)
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
2.0
GaAs IC 5 Bit Digital Attenuator 0.5 dB LSB DC–2 GHz
Compression Point vs. Attenuation,
Voltage, and Temperature
57
56
55
Input Power @ 1 dB Compression
Attenuation Control
State
Voltage (V) +25°C (dBm) +85°C (dBm) -40°C (dBm)
Ins. Loss
-3
22.70
23.30
24.20
+85˚C
54
IP3 (dBm)
AA280-25
53
52
+25˚C
51
50
-40˚C
49
48
47
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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
Attenuation (dB)
IP3 vs. Attenuation and Temperature
Pin Out
J1
Truth Table
GND GND GND GND GND GND
16
V1
V2
V3
V4
0.5 dB
Bit
1 dB
Bit
-5
-5
-5
0
-5
0
-5
0
Reference I.L.
2 dB
Bit
V5
V6
V7
4 dB
Bit
V8
Attenuation
J1–J2
8 dB
Bit
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.
15
8 dB
14
13
4 dB
12
11
2 dB
1
2
3
4
5
V8
V7
V6
V5
V4
10
Characteristic
6
V3
7
8
V2
V1
Value
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
-40°C to +85°C
Storage Temperature
-65°C to +150°C
ΘJC
85°C/W
Note: Exceeding these ratings may cause irreversible damage.
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
9
1 dB 0.5 dB
Absolute Maximum Ratings
RF Input Power
J2