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TH7110 Datasheet Preview

TH7110 Datasheet

315/433MHz FSK/FM/ASK Receiver

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TH7110
315/433MHz
FSK/FM/ASK Receiver
Features
! Double superhet architecture for high degree of image rejection
! FSK for digital data and FM reception for analog signal transmission
! FM/FSK demodulation either with phase-coincidence or PLL demodulator
! Low current consumption in active mode and very low standby current
! Switchable LNA gain for improved dynamic range
! AFC feature allows wide carrier frequency acceptance range
! RSSI allows signal strength indication and ASK detection
! Surface mount package LQFP44
Ordering Information
Part No.
TH7110
Temperature Range
-40 °C to 85 °C
Package
LQFP44
Application Examples
! General digital and analog 315 MHz or 433 MHz ISM band usage
! Low-power telemetry
! Alarm and security systems
DataSheet4U.com
! 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 for double conversion and 2.7 V to 5.5 V for single conversion
! 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 second IF filter BW (incl. SAW front-end filter loss)
! Sensitivity: -104 dBm 2) with 150 kHz second IF filter BW (incl. SAW front-end filter loss)
! Range of first IF: 10 MHz to 80 MHz
! Range of second IF: 455 kHz to 21.4 MHz
! Maximum input level: –10 dBm at ASK and 0 dBm at FSK
! Image rejection: > 65 dB (e.g. with SAW front-end filter and at 10.7 MHz 2nd 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
DataShee
DataSheet4U.com
TH7110 Data Sheet
3901007110
DataSheet4 U .com
Page 1 of 20
Nov. 2001
Rev. 005




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TH7110 Datasheet Preview

TH7110 Datasheet

315/433MHz FSK/FM/ASK Receiver

No Preview Available !

www.DataSheet4U.com
TH7110
315/433MHz
FSK/FM/ASK Receiver
General Description
The TH7110 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, ASK detection and automatic-frequency control (AFC)
" Bias circuitry for bandgap biasing and circuit shutdown
With the TH7110 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 varactor to create an AFC
circuit). In PLL demodulator configuration, the multiplier MIX3 forms a phase comparator. In ASK configurati-
on, the RSSI signal is feed to an ASK detector, which is constituted by the operational amplifier. The second
VCO (VCO2) can be used either as the VCO of a PLL demodulator or as the LO2 source of a second exter-
nal PLL in a multi-channel system. The following table briefly summarizes the various configurations.
et4U.com
FM/FSK
FM/FSK
FM/FSK
FM/FSK
ASK
ASK
Single-conversion configuration
Double-conversion configuration
narrow-band RX with ceramic demodulation narrow-band RX with ceramic demodulation
tank DataSheet4U.comtank
wide-band RX with LC demod. tank and AFC wide-band RX with LC demod. tank and AFC
extended sensitivity RX with PLL demodulator extended sensitivity RX with PLL demodulator
multi-channel RX with ceramic demodulation
tank and external channel synthesizer
RX with RSSI-based demodulation
RX with RSSI-based demodulation
RX with RSSI-based demodulation and exter-
nal channel synthesizer
DataShee
The preferred 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 front-end filter. Efficient RF front-end filtering is realized by using a SAW,
ceramic or helix filter in front of the LNA and by adding a LC filter at the LNA output.
It is also possible to use the TH7110 in single-conversion configuration. This can be achieved by switching
the LO2 input of MIX2 from the on-chip PLL synthesizer to the pin IN_MIX2 by means of an internal switch
(done via pin SW_MIX2). Now MIX2 operates as an amplifier for the IF1 signal if an external pull-down re-
sistor at pin IN_MIX2 is added.
The same setting of MIX2 can be used for multi-channel applications. In this situation IN_MIX2 must be
driven by an external LO2 signal. This signal can be generated by the VCO2, which is mainly a bipolar tran-
sistor that can be configured as a varactor-tuned VCO. Furthermore, a second external PLL for channel
selection via LO2 tuning is required. This may be arranged by using a PLL synthesizer chip that can be con-
trolled through a 3-wire bus serial interface. The reference signal for the external PLL synthesizer can be
directly taken from the crystal-based reference oscillator RO.
DataSheet4U.com
TH7110 Data Sheet
3901007110
DataSheet4 U .com
Page 2 of 20
Nov. 2001
Rev. 005


Part Number TH7110
Description 315/433MHz FSK/FM/ASK Receiver
Maker ETC
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TH7110 Datasheet PDF






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