SA5209 Просмотр технического описания (PDF) - NXP Semiconductors.
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SA5209 Datasheet PDF : 17 Pages
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Philips Semiconductors
Wideband variable gain amplifier
Product specification
SA5209
RF/IF
INPUT
R1 = R2 = 3.9k
R3 = 360Ω
R4 = 62k
R5 = 100Ω
R6 = 1k pot
2πfL1 = 10k
L1 = L2
5209
5209
5209
VCC
R1
R2
AGC
OUTPUT
R4
L1
L2
C4
–
5230
+
D1
D2
BAT 17
R3
C3
R6
D3
R5
BAT 17
VCC
Figure 3. AGC Configuration Using Cascaded SA5209s
SR00239
10µF
0.1µF
VIN
50Ω
0.1µF
0.1µF
50Ω
SOURCE
1997 Nov 07
1
VCC1
2
GND1
3
INA
4
GND1
5
INB
6 GND1
VCC2 16
GND2 15
OUTA 14
GND2 13
OUTB 12
GND2 11
0.1µF
+
V VCC
5VDC
0.1µF
OUTA
0.1µF
OUTB
7
VBG
8 VAGC
GND2 10
GND2 9
(16-Pin SO, 150-mil wide)
Figure 4. VGA AC Evaluation Board
SR00240
MINI CIRCUITS
2:1 BALUN
OR SIMILAR
1:2
+5V
5209
50Ω
VAGC
+1V
Figure 5. Broadband Noise Optimization
6
50Ω
OUTPUT
This circuit will exhibit about a 7dB
noise figure with approximately
22dB gain.
SR00241
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