參數(shù)資料
型號(hào)： ST7537
廠商： 意法半導(dǎo)體
英文描述： MOSFET; Transistor Polarity:P Channel; Drain Source Voltage, Vds:-30V; Continuous Drain Current, Id:-11.4A; On-Resistance, Rds(on):0.019ohm; Package/Case:8-SOIC
中文描述： 家庭自動(dòng)化調(diào)制解調(diào)器
文件頁(yè)數(shù)： 3/9頁(yè)
文件大小： 138K
代理商： ST7537
REFERENCE
VOLTAGE
CARRIER
DETECTION
A
F
Rx BAND-PASS
S.C. FILTER
S
F
A
M
S
F
Tx BAND-PASS
S.C. FILTER
O
A
CORRELATOR
POST-DEMO
S.C. FILTER
FSK DEMODULATOR
27
5
13
12
11
10
7
6
9
8
FSK
MODULATOR
17
16
18
19
24
20
C
T
R
22
23
M
A
S
F
I.F. BAND-PASS
S.C. FILTER
3
2
26
4
21
2
14
28
15
1
25
RAI
RxFO
CD
ATO
PAFB
PABC
PABC
RxD
IFO
XTAL1
XTAL2
MCLK
WD
RSTO
Rx/Tx
TxD
DEMI
TxIFI
AV
DD
DV
DD
AV
SS
DV
SS
V
CM
DV
CC
TEST LOGIC
TEST1
TEST2
TEST3
TEST4
ST7537HS1
7
BLOCK DIAGRAM
TRANSMIT SECTION
The transmit mode is set when Rx/Tx = 0, if Rx/Tx
is held at 0 longer than 1 second, then the device
switches automatically in the Rx mode. A new
activation of the Tx mode requires Rx/Tx to be
returned to 1 for a minimum 2 microsecond period
before being set to 0.
The Transmit Data (TxD) enter asynchronously the
FSK modulator with a nominal intra-message data
rate of 2400 bps.
The basic transmit frequencies are :
- f(TxD=0) = 133.05kHz
- f(TxD=1) = 131.85kHz
These frequencies are synthesized from a
11.0592MHz crystal oscillator; their precision is the
same as the crystal one’s (100ppm).
The modulated signal coming out of the FSK modu-
lator is filtered by a switched-capacitor band-pass
filter (Tx band-pass) in order to limit the output
spectrum and to reduce the level of harmonic com-
ponents.
The final stage of the Tx path consists of an opera-
tional amplifier which needs a feed-back signal
(PAFB) from the power amplifier as shown on
Application Schematic Diagram.
In Tx mode the Receive Data (RxD) signal is set to 1.
RECEIVE SECTION
The receive section is active when Rx/Tx = 1.
The Rx signal is applied on RAI and filtered by a
band-pass switched capacitor filter (Rx band-pass)
centered on the carrier frequency and whose band-
width is around 12kHz.
The Rx filter output is amplified by a 20dB gain
stage which provides symetrical limitations for
large voltage. The resulting signal is down-con-
verted by a mixer which receives a local oscillator
synthesized by the FSK modulator block. Finally an
intermediate frequency band-pass filter (IF band-
pass) whose central frequency is 5.4kHz improves
the signal to noise ratio before entering the FSK
demodulator.
The coupling of the intermediate frequency filter
output (IFO) to the FSK demodulator input (DEMI)
is made by an external capacitor C5 (100nF
±
10%,
10V) which cancels the Rx path offset voltage.
The RxD output delivers the demodulated signal if
the carrier detect (CD) signal is low and is set to
high level when CD = 1.
The RxD output can delivers the demodulated
signal whatever the level of CD (0 or 1) if Rx/Tx = 1
and TxD = 0 (see Figure 1).
ST7537HS1
3/9
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST7537HS1 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:HOME AUTOMATION MODEM
ST7537HS1CFN 功能描述:電信線(xiàn)路管理 IC 1/2 Dup Async Modem RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類(lèi)型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
ST7537HS1CFNTR 功能描述:電信線(xiàn)路管理 IC 1/2 Dup Async Modem RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類(lèi)型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
ST7538 制造商:STMicroelectronics 功能描述:HALF DUPLEX SYNCHRONOUS/ASYNCHRONOUS FSK MODEM - Bulk
ST7538P 功能描述:電信線(xiàn)路管理 IC 1/2 Duplex FSK Modem RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類(lèi)型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
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