SA5209N PHILIPS [NXP Semiconductors], SA5209N Datasheet - Page 8

• Manufacturer Part Number: SA5209N
• Description: Wideband variable gain amplifier
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
1990 Aug 20
Wideband variable gain amplifier
The high input impedance to the NE5209 makes matching
to crystal filters relatively easy. The total delta gain of this
system will approach 80dB. IF frequencies well into the UHF
region can be configured with this type of architecture.
CRYSTAL
FILTER
SOURCE
50
RF INPUT
SOURCE
5209
50
V
S
V
AGC
Figure 11. User-Programmable Fixed Gain Block
Figure 14. Test Set-up 1 (Used for all Graphs)
R
S
Figure 13. Receiver AGC IF Gain
R
Figure 12. AM Modulator
T
R
T
R
5209
8
V
.5V
V
BG
+5V
AGC
+5V
5209
5209
5209
V
V
CC
AGC
R
V
1
AGC
(+5V, unless otherwise noted)
V
AGC
9R
R
2
50
MODULATING
SIGNAL
+5V
R
50
L
OUTPUT
OUTPUT
50
50
FULL CARRIER
AM (DSB)
5209
All harmonic distortion products will be
at least -50dBc over the audio spectrum.
V
AGC
R
L
and is in units of Volts, for V
where V
Gain = 19dB + 20log
GAIN CONTROL
SIGNAL
AGC
NE/SA5209
=
50
Product specification
R
1
R
OUTPUT
50
2
10
R
AGC
V
SR00248
SR00249
SR00250
2
AGC
SR00247
V
1V
BG