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PDF AA226-87 Data sheet ( Hoja de datos )
| Número de pieza | AA226-87 | |
| Descripción | GaAs IC 4 Bit Digital Attenuator 1 dB LSB Positive Control 0.5-2.5 GHz | |
| Fabricantes | Alpha Industries | |
| Logotipo |  |
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GaAs IC 4 Bit Digital Attenuator
1 dB LSB Positive Control 0.5–2.5 GHz
AA226-87
Features
s Attenuation 1 dB Steps to 15 dB
with High Accuracy
s Single Positive Control (+3 to +5 V) for
Each Bit
s Low DC Power Consumption
s Small Low Cost TSSOP-16 Plastic
Package
TSSOP-16
PIN 16
0.173 (4.40 mm)
± 0.004 (0.10 mm)
0.252 (6.4 mm)
BSC
PIN 1
INDICATOR
PIN 1
0.197 (5.00 mm)
± 0.004 (0.10 mm)
0.0256 (0.65 mm) 0.047 (1.20 mm)
BSC
MAX.
R 0.004 (0.09 mm)
MIN.
Description
The AA226-87 is a 4 bit, single positive control GaAs IC
FET digital attenuator. It requires DC blocking capacitors,
positive supply voltage (VS) and four individual positive bit
control voltages (V1–V4). The AA226-87 is particularly
suited where high attenuation accuracy, low insertion loss
and low intermodulation products are required. Typical
applications include base station, wireless data and
wireless local loop gain control circuits.
0.009 (0.22 mm) REF.
0.035 (0.90 mm)
+ 0.006 (0.15 mm) /
-0.004 (-0.10 mm)
0.006 (0.15 mm) MAX.
0.002 (0.05 mm) MIN.
0.024
(0.60 mm)
± 0.006
(0.15 mm)
Electrical Specifications at -40°C to +85°C (0, +5 V)
Parameter1
Condition
Frequency
Min.
Typ. Max. Unit
Insertion Loss
0.5–1.0 GHz
1.0–2.0 GHz
2.0–2.5 GHz
1.3 1.7 dB
1.7 2.2 dB
2.3 2.6 dB
Attenuation Range
Attenuation Accuracy2
0.5–1.0 GHz
1.0–2.5 GHz
15
± (0.2 + 3% of
Attenuation Setting in dB)
± (0.3 + 4% of
Attenuation Setting in dB)
dB
dB
dB
VSWR (I/O)3
Switching Characteristics4
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
0.5–2.5 GHz
1.5:1
150
300
70
2.0:1
ns
ns
mV
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
VS = +3 V
VS = +5 V
0.5–2.5 GHz
0.5–2.5 GHz
For Two-tone Input Power +5 dBm
VS = +3 V
VS = +5 V
0.5–2.5 GHz
0.5–2.5 GHz
VLow = 0 to 0.2 V @ 20 µA Max.
VHigh = +3 V @ 100 µA Max. to +5 V @ 200 µA Max.
VS = VHigh ± 0.2 V
+20 +25
+24 +30
+43 +49
+44 +50
dBm
dBm
dBm
dBm
1. All measurements made in a 50 Ω system, unless otherwise specified.
2. Attenuation referenced to insertion loss.
3. Input/output.
4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com
Specifications subject to change without notice. 9/00A
1
1 page  
GaAs IC 4 Bit Digital Attenuator 1 dB LSB Positive Control 0.5–2.5 GHz
AA226-87
56
55
54 +85˚C
53
52
+25˚C
51
50
49
48 -40˚C
47
46
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Attenuation (dB)
IP3 vs. Attenuation and
Temperature (500 MHz)
Truth Table
V1
8 dB
V2
4 dB
V3
2 dB
VHigh
VHigh
VHigh
VHigh
0
0
VHigh
VHigh
VHigh
0
VHigh
0
VHigh
VHigh
0
VHigh
VHigh
0
VHigh = +3 to +5 V (VS = VHigh ± 0.2 V).
V4
1 dB
VHigh
0
VHigh
VHigh
VHigh
0
Attenuation
J1–J2
Reference I.L.
1 dB
2 dB
4 dB
8 dB
15 dB Max. Atten.
Absolute Maximum Ratings
Characteristic
Value
RF Input Power
1 W > 500 MHz 0/8 V
0.5 W @ 50 MHz 0/8 V
Supply Voltage
+8 V
Control Voltage
-0.2 V, +8 V
Operating Temperature
-40°C to +85°C
Storage Temperature
-65°C to +150°C
Note: Exceeding these parameters may cause irreversible damage.
Compression Point vs. Attenuation,
Voltage, and Temperature
Attenuation Control Input Power @ 1 dB Compression
State Voltage (V) +25°C (dBm) +85°C (dBm) -40°C (dBm)
Ins. Loss
3
24.5 24.1 24.6
1 dB
3
25.2 24.8 25.2
2 dB
3
25.0 24.3 24.9
4 dB
3
31.2 30.4 32.8
8 dB
3
28.3 26.3 29.2
15 dB
3
26.6 24.8 27.5
Pin Out
J1
CBL
GND
GND
V1
V2
V3
V4
GND
GND
8 dB
4 dB
2 dB
1 dB
GND
GND
GND
GND
GND
GND
VS
10 kΩ
CBL
J2
DC blocking capacitors (CBL) and biasing resistor must be supplied externally
for positive voltage operation.
CBL = 47 pF for operation >500 MHz.
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com
Specifications subject to change without notice. 9/00A
5
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| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet AA226-87.PDF ] | |
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