TSH511C View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TSH511C' PDF : 18 Pages View PDF
TSH511
8
General description
General description
The TSH511 is a 0.4MHz to 11MHz dual FM analog receiver. The incoming signal is
amplified with a 22dB low noise amplifier (LNA) section. The good noise performance of the
LNA allows the photo diode for infrared applications to be connected directly to the TSH511
without any external preamplifier. The access pins for each section and the two standby
configurations offer high versatility for many applications: hi-fi stereo infrared receiver,
mono/stereo subcarrier receiver, power line carrier audio.
Figure 25. TSH511 block diagram
44 43 42 41 40 39 38 37 36 35 34
GND
1
AMP-IN2
2
VCC
3
LNA-OUT2 4
VCC
5
LNA-IN
6
GND
7
LNA-OUT1 8
VCC
9
AMP-IN1 10
DEC-LNA 11
amp.
LNA
amp.
33 GND
limiter
FM demodulator
RX2
Standby
32 SBY1
31 SBY2
30 BUF-OUT2
TSH511
Audio
buffers
29 VCC
28 DEC-OUT
27 GND
RX1
limiter
Vref
FM demodulator
26 BUF-OUT1
25
SQUELCH
24
MUTE-OUT
MUTE-INT
23 MUTE-IN
12 13 14 15 16 17 18 19 20 21 22
The LNA is common to both receivers but the output is split in two: one for each receiver.
Each LNA output can be connected to a first optional filter for bandpass or reject filtering.
The filtered signal is amplified with an intermediate amplifier (AMP) section followed by a
second filter. The AMP sections have 20dB typical gain.
Finally, the signal is amplified and limited in the limiter (LIM) section. The 60dB amplifier-
limiter LIM provides a constant amplitude signal to the demodulator. It reduces AM parasitic
demodulation in the FM demodulator.
The FM demodulator is a classic quadrature detector that uses an external tank.
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