參數(shù)資料
型號(hào)： S1T8528X0
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： ENHANCED-1 CHIP CT0 RF IC
中文描述： 強(qiáng)化- 1射頻集成電路芯片CT0
文件頁(yè)數(shù)： 5/35頁(yè)
文件大?。?/td> 1905K
代理商： S1T8528X0
ENHANCED-1 CHIP CT0 RF IC
S1T8528
5
18
SAO 1
Output terminal of Speaker amp 1.
DC voltage level is Vcc/ 2.
19
SAI
Speaker Amp 1 input terminal.
Between this terminal and Expander output terminal, apply DC coupled capacitor.
20
EO
Output terminal of Expander
21
ERC
Converts waveform from the full wave rectifier to DC element at the rectifier block of
Expander. ( RC = 33 msec at C = 3.3uF )
22
EPI
Pre-amp inverting input terminal of Expander.
Adjusts the negative feedback loop gain. ( in application, gain is 5 )
23
ALC
Reference current input terminal of Automatic Level Control ( ALC); Adjusts THD of
compressor output voltage to less than 3% or limits the frequency deviation of TX if the
input is higher than a certain level. The ALC circuit may be turned off depending on the
ALC reference current or the magnitude of output voltage may be limited if it is higher
than a certain level.
24
V
REF(COMP)
Reference voltage ( VREF= 1/2 VCC ). Supplies a regulator voltage to the Compressor
and Expander of COMPANDER.
25
RSSI
Received Signal Strength Indicator terminal ( Analog type )
26
DSCO
Output terminal of Data Slicing comparator.
Separates Frequency Shift Keying ( FSK ) serial data and executes data shaping and
limiting.
27
DSCI
Input terminal of Data slicing comparator.
Non-inverting type with the negative input terminal biased to 1/2 Vcc.
28
RAO
Recovered Audio Output terminal. Voice signals detected by the Quadrature Detector
are amplified and then output through this terminal.
29
QCI
Quadrature coil input terminal.
The 455kHz oscillator circuit is an Lp = 680uH, Cp = 180pF valued LC tank circuit.
Voice signals are detected by mixture of 455kHz ( by phase difference ) which is
converted from mixer 2.
30
GND
RX
Ground .
Ground for Receiver.
31
32
LD
LI
Limiter input and decoupling terminal.
Limiter block removes amplitude modulation elements caused by fading or FM signal
noise. Limiting IF stage makes the second intermediate frequency amplify and limit.
The input impedance of the limiting IF amplifier is set to 1.5k
.
While FM waves are transmitted with constant magnitude, their magnitudes are slightly
modulated due to reflection from obstacles, fading phenomenon, noise wave and
mixing with AM wave elements before entering the receiver
’
s antenna.
The limiter makes amplitude uniform by removing these AM wave elements.
33
V
CC(RX)
Supply voltage.
Supplies power to the Receiver.
PIN DESCRIPTION (Continued)
Pin No
Symbol
Description
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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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