FSK/FM/ASK Receiver. TH71101 Datasheet

TH71101 Receiver. Datasheet pdf. Equivalent

TH71101 Datasheet
Recommendation TH71101 Datasheet
Part TH71101
Description FSK/FM/ASK Receiver
Feature TH71101; TH71101 315/433MHz FSK/FM/ASK Receiver Features ! ! ! ! ! ! ! Single superhet architecture for low e.
Manufacture ETC
Datasheet
Download TH71101 Datasheet




ETC TH71101
TH71101
315/433MHz
FSK/FM/ASK Receiver
Features
! Single superhet architecture for low external component count
! FSK for digital data and FM reception for analog signal transmission
! FM/FSK demodulation with phase-coincidence demodulator
! Low current consumption in active mode and very low standby current
! Switchable LNA gain for improved dynamic range
! RSSI allows signal strength indication and ASK detection
! Surface mount package LQFP32
Ordering Information
Part No.
TH71101
Temperature Range
-40 °C to 85°C
Package
LQFP32
Application Examples
! General digital and analog 315 MHz or 433 MHz ISM band usage
! Low-power telemetry
! Alarm and security systems
! Keyless car and central locking
! Pagers
Technical Data Overview
! Input frequency range: 300 MHz to 450 MHz
! Power supply range: 2.5 V to 5.5 V at 315 MHz and 2.7 V to 5.5 V at 433 MHz
! Temperature range: -40 °C to +85 °C
! Operating current: 6.5 mA at low gain and 8.2 mA at high gain mode
! Standby current: < 100 nA
! Sensitivity: -111 dBm 1) with 40 kHz IF filter BW (incl. SAW front-end filter loss)
! Sensitivity: -104 dBm 2) with 150 kHz IF filter BW (incl. SAW front-end filter loss)
! Range of IF: 455 kHz to 21.4 MHz
! Maximum input level: –10 dBm at ASK and 0 dBm at FSK
! Image rejection: > 55 dB (e.g. with SAW front-end filter and at 10.7 MHz IF)
! Spurious emission: < -70 dBm
! Input frequency acceptance: ±50 kHz (with AFC option)
! RSSI range: 70 dB
! Frequency deviation range: ±5 kHz to ±120 kHz
! Maximum data rate: 80 kbit/s NRZ
! Maximum analog modulation frequency: 15 kHz
1) at ± 8 kHz FSK deviation, BER = 310-3 and phase-coincidence demodulation
2) at ± 50 kHz FSK deviation, BER = 310-3 and phase-coincidence demodulation
TH71101 Data Sheet
3901071101
Page 1 of 20
Nov. 2001
Rev. 005



ETC TH71101
TH71101
315/433MHz
FSK/FM/ASK Receiver
General Description
The TH71101 receiver IC consists of the following building blocks
" PLL synthesizer (PLL SYNTH) for generation of the local oscillator signal LO
" Parts of the PLL SYNTH are the high-frequency VCO1, the feedback divider DIV_16,
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 IF
" IF pre amplifier which is a mixer cell (MIX2) that operates as an amplifier
" IF amplifier (IFA) to amplify and limit the IF 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 TH71101 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
A double-conversion variant, called TH71102, is also available. This receiver IC allows a higher degree of
image rejection, achieved in conjunction with an RF frontend filter. Both RXICs have the same die. At the
TH71102, the second mixer (MIX2) is used to down-convert the first IF (IF1) to the second IF (IF2). At the
TH71101, MIX2 operates as an amplifier.
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.
TH71101 Data Sheet
3901071101
Page 2 of 20
Nov. 2001
Rev. 005



ETC TH71101
Block Diagram
TH71101
315/433MHz
FSK/FM/ASK Receiver
IN_DEM
OUT_IFA
RSSI
FPC2
FBC1
IN_IFA
VEE_IF
OUT_MIX2
VCC_MIX
IF1N
IF1P
VEE_MIX
IN_MIX1
OUT_LNA
GAIN_LNA
VEE_LNAC
VCC_BIAS
VEE_BIAS
ENRX
VCC_PLL
VEE_RO
VEE_LNA
VCC_LNA
Fig. 1: TH71101 block diagram
TH71101 Data Sheet
3901071101
Page 3 of 20
Nov. 2001
Rev. 005







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