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TH71102 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - FSK/FM/ASK Receiver - ETC

भाग संख्या TH71102
समारोह FSK/FM/ASK Receiver
मैन्युफैक्चरर्स ETC 
लोगो ETC लोगो 
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TH71102 pdf
TH71102
315/433MHz
FSK/FM/ASK Receiver
General Description
The TH71102 receiver IC consists of the following building blocks:
" PLL synthesizer (PLL SYNTH) for generation of the first and second local oscillator signals LO1 and LO2
" Parts of the PLL SYNTH are the high-frequency VCO1, the feedback dividers DIV_8 and DIV_2,
a phase-frequency detector (PFD) with charge pump (CP) and a crystal-based reference oscillator (RO)
" Low-noise amplifier (LNA) for high-sensitivity RF signal reception
" First mixer (MIX1) for down-conversion of the RF signal to the first IF (IF1)
" second mixer (MIX2) for down-conversion of the IF1 to the second IF (IF2)
" IF amplifier (IFA) to amplify and limit the IF2 signal and for RSSI generation
" Phase coincidence demodulator (DEMOD) with third mixer (MIX3) to demodulate the IF signal
" Operational amplifier (OA) for data slicing, filtering and ASK detection
" Bias circuitry for bandgap biasing and circuit shutdown
With the TH71102 receiver chip, various circuit configurations can be arranged in order to meet a number of
different customer requirements. For FM/FSK reception the IF tank used in the phase coincidence demodu-
lator can be constituted either by a ceramic resonator or an LC tank (optionally with a varactor diode to create
an AFC circuit). In ASK configuration, the RSSI signal is feed to an ASK detector, which is constituted by the
operational amplifier.
Demodulation
FM / FSK
FM / FSK
ASK
Type of receiver
narrow-band RX with ceramic demodulation tank
wide-band RX with LC demodulation tank
RX with RSSI-based demodulation
The superheterodyne configuration is double conversion where MIX1 and MIX2 are driven by the internal
local oscillator signals LO1 and LO2, respectively. This allows a high degree of image rejection, achieved in
conjunction with an RF frontend filter. Efficient RF frontend filtering is realized by using a SAW, ceramic or
helix filter in front of the LNA and by adding an LC filter at the LNA output.
A single-conversion variant, called TH71101, is also available. Both RXICs have the same die. At the
TH71101 the second mixer MIX2 operates as an amplifier.
TH71102 Data Sheet
3901071102
Page 2 of 20
Nov. 2001
Rev. 005

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डाउनलोड[ TH71102 Datasheet.PDF ]


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