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參數(shù)資料
| 型號： | ST7537HS1 |
| 廠商： | 意法半導體 |
| 英文描述： | HOME AUTOMATION MODEM |
| 中文描述： | 家庭自動化調(diào)制解調(diào)器 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 138K |
| 代理商： | ST7537HS1 |
ADDITIONAL DIGITAL AND ANALOG FUNC-
TIONS
Time base
A time base section delivers all the internal clocks
from a crystal oscillator (11.0592MHz). The crystal
is connected between XTAL1 and XTAL2 pins and
needs two external capacitors C3 and C4 (22pF
±
10%, 10V) for proper operation.
Reset and watch-dog
The reset output (RSTO) is driven high when the
supply voltage is lower than Vrh (typically 7.6V) with
an hysteresis Vrh-Vrl (typically 300mV) or when no
negative transition occurs on the watch-dog input
(WD) for more than 1.5 second (see the timing
chart on Figure 2). When a reset occurs RSTO is
held high for at least 50ms.
Signal detection
The Carrier Detect output (CD) is driven low when
the input signal amplitude on RAI is greater than
V
CD
for at least T
CD
(typically 6ms see the timing
chart on Figure 3). When the input signal desap-
pears or becomes lower than V
CD
, CD is held low
for at least Tcd before returning to a high level. V
CD
is the carrier detection threshold voltage which is
set internally to detect 5mV
RMS
typically.
External power amplifier bias control
Two dedicated digital output (PABC and PABC)
delivering a signal between 0V and 10V are driven
low respectively high, when the circuit is set in the
receive mode (Rx/Tx=1) or when the transmit mode
time out (1 second) is exceeded; in the same time
the output ATO is put in a high impedance state.
TESTING FEATURES
- An additionnal amplifier allows the observation of
the Rx band-pass filter output on pin RxFO.
- A direct input to the Tx band-pass filter and to the
IF filter (TxIFI) is selected when TEST3 = 1.
- The 1 second normal duration of the Tx to Rx
mode automatic switching is reduced to 488
μ
s
and the 1.5 second watch-dog time out is reduced
to 46.3
μ
s when TEST2 = 1.
- When TEST1 = 1 the Tx to Rx mode automatic
switching is desactivated and the functional mode
of the circuit is fully controlled by Rx/Tx.
- TEST4 is a reset input which allows an undelayed
control of RSTO and of the internal state of the
circuit.
POWER SUPPLIES WIRING PRECAUTIONS
The ST7537HS1 has two positive power supply
terminals (AV
DD
,DV
DD
) and two ground terminals
(AV
SS
,DV
SS
) in order to separate internal analog
and digital supplies. The analog and digital termi-
nals of each supply pair must be connected to-
gether externally for proper operation.
The V
DD
must be protected against short-circuit for
proper operation.
Rx/Tx
CD
TxD
RxD
DATA
DATA
7
Figure 1 :
Data Timing Chart
ST7537HS1
4/9
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ST7537HS1CFN | 功能描述:電信線路管理 IC 1/2 Dup Async Modem RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型: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 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| ST7537HS1CFNTR | 功能描述:電信線路管理 IC 1/2 Dup Async Modem RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型: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:電信線路管理 IC 1/2 Duplex FSK Modem RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型: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 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| ST7538P013TR | 功能描述:電信集成電路 1/2 Duplex FSK Modem RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
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