SA5209 Datasheet, PDF (6/17 Pages) NXP Semiconductors – Wideband variable gain amplifier

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
V_CC
R1
R2
AGC
OUTPUT
R4
L1
L2
C4
–
5230
+
D1
D2
BAT 17
R3
C3
R6
D3
R5
BAT 17
V_CC
Figure 3. AGC Configuration Using Cascaded SA5209s
SR00239
10µF
0.1µF
V_IN
50Ω
0.1µF
0.1µF
50Ω
SOURCE
1997 Nov 07
1
V_CC1
2
GND1
3
IN_A
4
GND1
5
IN_B
6 GND1
V_CC2 ¹⁶
GND₂ ¹⁵
OUT_A 14
GND2 13
OUT_B 12
GND2 11
0.1µF
+
V ^VCC
5VDC
0.1µF
OUT_A
0.1µF
OUT_B
7
V_BG
8 V_AGC
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
V_AGC
+1V
Figure 5. Broadband Noise Optimization
6
50Ω
OUTPUT
This circuit will exhibit about a 7dB
noise figure with approximately
22dB gain.
SR00241