TSH511CF STMicroelectronics, TSH511CF Datasheet - Page 19
![IC RECEIVER DUAL FM 44-TQFP](/photos/6/84/68458/497-44-tqfp_44-lqfp_sml.jpg)
TSH511CF
Manufacturer Part Number
TSH511CF
Description
IC RECEIVER DUAL FM 44-TQFP
Manufacturer
STMicroelectronics
Datasheet
1.TSH511CFT.pdf
(25 pages)
Specifications of TSH511CF
Frequency
2.3MHz and 2.8MHz
Sensitivity
-95dBm
Modulation Or Protocol
FM
Applications
Infrared Headsets, Infrared Hi-Fi Stereo Transmitters
Current - Receiving
15mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Voltage - Supply
2.3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
For Use With
497-8516 - BLANK PCB W/ BOM FOR TSH511/12
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Memory Size
-
Data Rate - Maximum
-
Other names
497-2322
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
TSH511
8.2
8.3
The LNA output is directly connected to LNA-OUT1 and LNA-OUT2 pins in parallel (pin 8
and 4 respectively). Because the LNA minimum impedance load is 1k
on each pin LNA-OUT1 or LNA-OUT2 must be 2k
The series 50
thus improving noise performance.
AMP and LIM sections: amplifier and limiter
The first filter output is connected to the intermediate amplifier AMP. The gain of AMP is
typically 20dB. The second filter is connected between the output of AMP and the input of
the limiter LIM. The 60dB limiter LIM provides a constant amplitude signal to the FM
demodulator. It reduces the AM parasitic effects into the FM demodulator.
Figure 27. AMP and LIM schematics
FM demodulator section
The FM demodulator is a classic quadrature demodulator based on a multiplier. The
quadrature is performed with the tank circuit L
is tuned on the receiving frequency.
The R
circuit. It allows to adjust the demodulation characteristics. For a given transmitting
deviation, a lower value of R
distortion.
The AC amplitude on pin 18 must not exceed 300mV
ESD diodes of the circuit.
lo
resistor is connected in parallel with L
Ω
resistor and the 100nF capacitor decouple the LNA supply voltage (pin 5),
lo
gives a lower demodulated amplitude and reduces the
lo
lo
and C
inductor and C
Ω
minimum.
RMS
lo
to reduce the Q factor of the tank
to prevent clipping by the internal
lo
capacitor. The tank circuit
Ω
, the load impedance
General description
19/25