收藏本站
TH71112
868/915MHz
FSK/ASK Receiver
1
1.1
Theory of Operation
General
With the TH71112 receiver chip, various circuit configurations can be arranged in order to meet a number of
different customer requirements. For FSK reception the IF tank used in the phase coincidence demodulator
can be constituted by an external ceramic discriminator. In ASK configuration, the RSSI signal is fed to an
ASK detector, which is constituted by the operational amplifier.
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 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 an LC filter at the LNA output.
A single-conversion variant, called TH71111, is also available. Both Receiver ICs have the same die. At the
TH71111 the second mixer MIX2 operates as an amplifier.
The TH71112 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_16 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
1.2
Technical Data Overview
Input frequency range: 750 MHz to 990 MHz
Power supply range: 2.3 V to 5.5 V @ ASK
Temperature range: -40 °C to +85 °C
Standby current: 50 nA
Operating current: 7.5 mA @ low gain mode
9.2 mA @ high gain mode
Sensitivity: -112 dBm @ ASK 1)
-106 dBm @ FSK 2)
Maximum data rate: 260 kbps NRZ @ ASK
Range of IF2: 400 kHz to 22 MHz
Maximum input level: -10 dBm @ ASK
0 dBm @ FSK
Image rejection: > 60 dB (e.g. with 868.3 MHz SAW
front-end filter and at 10.7 MHz IF2)
Spurious emission: < -70 dBm
Input frequency acceptance range: up to ± 100 kHz
RSSI range: 70 dB
FSK deviation range: ± 2.5 kHz to ± 80 kHz
180 kbps NRZ @ FSK
Range of IF1: 10 MHz to 80 MHz
at 4 kbps NRZ, BER = 3 ? 10 -3 , 180 kHz IF filter BW, without SAW front-end-filter loss
at 4 kbps NRZ, BER = 3 ? 10 -3 , ± 20 kHz FSK deviation, 180 kHz IF filter BW, without SAW front-end-filter loss
39010 71112
Rev. 016
Page 3 of 20
Data Sheet
Jun/12
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
THS9001DBVTG4 IC CASCADEABL AMP 350MHZ SOT23-6
TMD26711 IC PROXIMITY DETECTOR DGTL 8-MOD
TN0200K-T1-E3 MOSFET N-CH 20V 730MA SOT23-3
TN2404K-T1-GE3 MOSFET N-CH 240V 200MA TO236
TP0101K-T1-GE3 MOSFET P-CH D-S 20V TO236
TRF3702IRHCG4 IC QUADRATURE MODULATOR 16-VQFN
TRF3705IRGET IC QUADRATURE MODULATOR 24VQFN
TRF7970AEVM EVAL MODULE FOR TRF7970A
相关代理商/技术参数
TH711311 制造商:C&K Components 功能描述:
TH712 制造商:Glenair Inc 功能描述:
TH7120 制造商:未知厂家 制造商全称:未知厂家 功能描述:300 to 930MHz FSK/FM/ASK Transceiver
TH7121 制造商:未知厂家 制造商全称:未知厂家 功能描述:300 to 930MHz FSK/FM/ASK Transceiver
TH7122 制造商:MELEXIS 制造商全称:Melexis Microelectronic Systems 功能描述:27 to 930MHz FSK/FM/ASK Transceiver
TH71221 制造商:MELEXIS 制造商全称:Melexis Microelectronic Systems 功能描述:27 to 930MHz FSK/FM/ASK Transceiver
TH71221ELQ 制造商:MELEXIS 功能描述:TRX FSK/FM/ASK 27-930MHZ 32QFN 制造商:Melexis Semiconductors 功能描述:TRX, FSK/FM/ASK, 27-930MHZ, 32QFN 制造商:MELEXIS 功能描述:TRX, FSK/FM/ASK, 27-930MHZ, 32QFN; Frequency Min:300MHz; Frequency Max:930MHz; Modulation Type:AM, FM, FSK; Sensitivity dBm:-107dBm; Data Rate:115Kbps; Supply Voltage Min:2.2V; Supply Voltage Max:5.5V; RF IC Case Style:QFN; No. of ;RoHS Compliant: Yes
TH71221ELQ-BAA-000-RE 制造商:Melexis Semiconductors 功能描述:IC TXRX FSK/FM/ASK 32QFN 制造商:Melexis Semiconductors 功能描述:TH71221 Series 300 to 930 MHz 115 kbps SMT FSK/AM/ASK Transceiver - QFN-32