SA5219 Datasheet, PDF (8/18 Pages) NXP Semiconductors – Wideband variable gain amplifier

Philips Semiconductors
Wideband variable gain amplifier
Product specification
SA5219
CRYSTAL
FILTER
RF INPUT
50Ω
SOURCE
5219
V_AGC
+5V
5219
V_AGC
.5V
R
9R
FULL CARRIER
AM (DSB)
50Ω
OUTPUT
50Ω
+5V
All harmonic distortion products will be
at least -50dBc over the audio spectrum.
Figure 12. AM Modulator
MODULATING
SIGNAL
SR00284
5219
5219
50Ω
OUTPUT
V_AGC
50Ω
V_AGC
The high input impedance to the NE5219 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.
Figure 13. Receiver AGC IF Gain
R_S
V_S ^±
R_T
R_T
V_CC (+5V, unless otherwise noted)
5219
± _VAGC
R_L
R_L
Figure 14. Test Set-up 1 (Used for all Graphs)
SR00286
GAIN CONTROL
SIGNAL
SR00285
1997 Nov 07
8