SA5219 Datasheet, PDF (6/18 Pages) NXP Semiconductors – Wideband variable gain amplifier

Philips Semiconductors
Wideband variable gain amplifier
Product specification
SA5219
10µF
0.1µF
V_IN
50Ω
0.1µF
0.1µF
1
V_CC1
2
GND1
3
IN_A
4
GND1
5
IN_B
6 GND1
7
V_BG
8 V_AGC
V_CC2 ¹⁶
GND₂ ¹⁵
OUT_A 14
GND2 13
OUT_B 12
GND2 11
GND2 10
GND2 9
0.1µF
+
V ^VCC
5VDC
0.1µF
OUT_A
0.1µF
OUT_B
1997 Nov 07
50Ω
SOURCE
Figure 4. VGA AC Evaluation Board
MINI CIRCUITS
2:1 BALUN
OR SIMILAR
+5V
5219
50Ω
1:2
V_AGC
+1V
Figure 5. Broadband Noise Optimization
50Ω
SOURCE
2:1 TURNS RATIO
LC TUNED
TRANSFORMER
+5V
5219
50Ω
V_AGC
+1V
Figure 6. Narrowband Noise Optimization
50Ω
SOURCE
+5V
MINI CIRCUITS
4:1 BALUN OR
EQUIVALENT
5219
1:4
50Ω
V_AGC
+1V
Figure 7. Broadband Gain Optimization
6
SR00276
50Ω
OUTPUT
This circuit will exhibit about a 7dB
noise figure with approximately
22dB gain.
SR00277
50Ω
OUTPUT
This circuit will exhibit about a 7dB
noise figure with approximately
22dB gain. Narrowband circuits
have the advantage of greater stabil-
ity, particularly when multiple de-
vices are cascaded.
SR00278
50Ω
OUTPUT
This circuit will exhibit about an 8dB
noise figure with 24dB gain.
SR00279