GaAs IC 1 Bit Digital Attenuator 32 dB 2.5 GHz
AA104-73
Pin Out
Absolute Maximum Ratings
Characteristic
Value
Positive Voltage
RF Input Power
1 W > 500 MHz 0/8 V
0.5 W @ 50 MHz 0/8 V
J1
V2
Supply Voltage
+8 V
CBL
Control Voltage
-0.2 V, +8 V
32
NC/GND
V1
CBP
Operating Temperature
Storage Temperature
-40°C to +85°C
-65°C to +150°C
RF
GND
J2
Note: Exceeding these parameters may cause irreversible damage.
CBL
CBL = 47 pF for frequencies >500 MHz. See Table on previous page for
CBP value.
See application notes APN2013 and APN2014 for 6 bit attenuator requirements.
Truth Table
Positive Control
Attenuation
V1
V2
J1–J2
Reference I.L.
32 dB
VHigh
0
0
VHigh
VHigh = +3 to +5 V.
Application: AA104-73 used as 1 Bit 20 dB Attenuator 25°C (0, +5 V)
2.50
J1
V2
CBL
2.25
2.00
20
NC/GND
V1
CBP RBP
RF
GND
J2
1.75
1.50
1.25
1.00
CBL
S22 25˚C
S11 25˚C
CBL = 220 pF, CBP = 100 pF, RBP = 15 Ω, fC = 400 MHz with select values of
CBP and RBP, center frequency and attenuation value respectively
can be varied.
-15
-16
-17
-18
-19
-20
-21
-22
0
0.2
0.4
0.6
0.8
1.0
Frequency (GHz)
VSWR vs. Frequency
20 dB State
20 dB 25˚C
-23
-24
-25
0
0.2
0.4
0.6
0.8
1.0
Frequency (GHz)
20 dB State vs. Frequency
= 100 pF, C = 220 pF, R = 15 Ω
C
BP
BL
BP
4
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com
Specifications subject to change without notice. 5/00A
ALPHA [ ALPHA INDUSTRIES ]
