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參數(shù)資料
| 型號： | T5761-TG |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | UHF ASK/FSK Receiver |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 3/32頁 |
| 文件大?。?/td> | 765K |
| 代理商： | T5761-TG |
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T5761
T5760 /
Preliminary Information
Rev. A2, 19-Oct-00
3 (32)
Block Diagram
SENS
CDEM
AVCC
AGND
DGND
LNAGND
LNA_IN
DATA
POLLING/_ON
DATA_CLK
DVCC
XTAL
Polling circuit
and
control logic
Rssi
Limiter out
LC
–
VCO
f
:256
XTO
Standby logic
FE
CLK
FSK/ASK
–
demodulator
and data filter
RSSI IF
Amp.
Poly
–
LPF
fg=7MHz
LNA
4. Order
f0=950 kHz/
1 MHz
Dem_out
Sensitivity
–
reduction
LPF
fg=2.2MHz
IF
Amp.
IC_ACTIVE
Data
–
interface
LNAREF
f
:2
Loop
–
filter
Figure 3. Block diagram
RF Front End
The RF front end of the receiver is a low-IF heterodyne
configuration that converts the input signal into a
950-kHz/ 1-MHz IF signal with an image rejection of typ-
ical 30dB. According to figure 3 the front end consists of
an LNA (low noise amplifier), LO (local oscillator), I/Q
mixer, polyphase lowpass filter and an IF amplifier.
The PLL generates the carrier frequency for the mixer via
a full integrated synthesizer with integrated low noise
LC-VCO (voltage controlled oscillator ) and PLL-loop-
filter. The XTO ( crystal oscillator ) generates the
reference frequency f
XTO
. The integrated LC-VCO gen-
erates two times the mixer drive frequency f
VCO
. The I/Q
signals for the mixer are generated with a divide by two
circuit ( f
LO
= f
VCO
/2 ). f
VCO
is divided by a factor of 256
and feed into a phase frequency detector and compared
with f
XTO
. The output of the phase frequency detector is
feed into an integrated loopfilter and thereby generates
the control voltage for the VCO. If f
LO
is determined,
f
XTO
can be calculated using the following formula:
f
XTO
= f
LO
/ 128
The XTO is a one-pin oscillator that operates at the series
resonance of the quartz crystal with high current but low
voltage signal, so that there is only a small voltage at the
crystal oscillator frequency at Pin XTAL. According to
figure 4, the crystal should be connected to GND with a
series capacitor C
L
. The value of that capacitor is recom-
mended by the crystal supplier. Due to a somewhat
inductive impedance at steady state oscillation and some
PCB parasitics a lower value of C
L
is normally necessary.
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| T5761-TGQ | 功能描述:IC RX 915MHZ ISM ASK/FSK 20SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調(diào)制或協(xié)議:- 應(yīng)用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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