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參數(shù)資料
| 型號(hào)： | S1T8531X01-S0B0 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | WIDEBAND FM/FSK IF RECEIVER |
| 中文描述： | 寬頻帶調(diào)頻/中頻接收機(jī)頻移鍵控 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 157K |
| 代理商： | S1T8531X01-S0B0 |
S1T8531
WIDEBAND FM/FSK IF RECEIVER
8
Data Slicer with Sample and Hold
The data slicer is a comparator that is designed to square up the data signal. The recovered data signal from the
baseband filter output can be DC coupled to the data slicer DS-INP(Pin 9). The S1T8531’s data slicer incorporates
an sample and hold used to derive the data slicer reference voltage by means of an external integration circuit. The
sample and hold is “ON“ during reception of the preamble data pattern, and is otherwise “OFF“ in TDD (Time
Division Duplex) system. The external integration circuit is formed by an RC low pass circuit placed between SHO
(Pin 10) and ground.
The size of this resistor and capacitor and the nature of the data signal determine how faithfully the data slicer
shapes up the recovered signal. The time constant is short for large peak to peak voltage swings or when there is a
change in DC level at the detector output. For small signal or for continuous bits of the same polarity which drift
close to the threshold voltage, the time constant is longer.
‘The sample and hold is able to sink/source 3mA to/from the external integration circuit in order to minimize the
settling time. When the sample and hold is “OFF“ the output (SHO) is in high impedance state with extremely low
leakage current.
‘Following figure shows the internal block diagram.
The output of the data slicer (DS-OUT) is a CMOS compatible bitstream. However, it is recommeded that an
external NPN amplifier stage be used to drive the CMOS baseband processor, in order to minimize the amount of
ground and supply currents in the S1T8531 which might desensitize the chip.
The data slicer can be used as a carrier detector also. Following figure shows application example. In this case,
sample and hold should be off.
DS INP
DS INN
SHEN
DS OUT
SHO
8
9
10
13
11
+1
Carrier
Detect
RSSI
Reference
Voltage
11
12
9
8
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| S1T8536 | 制造商:SAMSUNG 制造商全稱(chēng):Samsung semiconductor 功能描述:2.4GHZ-2.5GHZ SINGLE-CHIP RF TRANSCEIVER |
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| S1T8602B01-D0B0 | 制造商:SAMSUNG 制造商全稱(chēng):Samsung semiconductor 功能描述:LOW VOLTAGE AUDIO AMPLIFIER |
| S1T8602B01-S0B0 | 制造商:SAMSUNG 制造商全稱(chēng):Samsung semiconductor 功能描述:LOW VOLTAGE AUDIO AMPLIFIER |
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