S1T8528 データシートの表示（PDF） - Samsung

部品番号

コンポーネント説明

メーカー

S1T8528

ENHANCED-1 CHIP CT0 RF IC

Samsung 

ENHANCED-1 CHIP CT0 RF IC

S1T8528

PIN DESCRIPTION (Continued)

Pin No Symbol

18

SAO 1

19

SAI

20

EO

21

ERC

22

EPI

23

ALC

24

VREF(COMP)

25

RSSI

26

DSCO

27

DSCI

28

RAO

29

QCI

30

GNDRX

31

LD

32

LI

33

VCC(RX)

Description

Output terminal of Speaker amp 1.

DC voltage level is Vcc/ 2.

Speaker Amp 1 input terminal.

Between this terminal and Expander output terminal, apply DC coupled capacitor.

Output terminal of Expander

Converts waveform from the full wave rectifier to DC element at the rectifier block of

Expander. ( RC = 33 msec at C = 3.3uF )

Pre-amp inverting input terminal of Expander.

Adjusts the negative feedback loop gain. ( in application, gain is 5 )

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.

Reference voltage ( VREF= 1/2 VCC ). Supplies a regulator voltage to the Compressor

and Expander of COMPANDER.

Received Signal Strength Indicator terminal ( Analog type )

Output terminal of Data Slicing comparator.

Separates Frequency Shift Keying ( FSK ) serial data and executes data shaping and

limiting.

Input terminal of Data slicing comparator.

Non-inverting type with the negative input terminal biased to 1/2 Vcc.

Recovered Audio Output terminal. Voice signals detected by the Quadrature Detector

are amplified and then output through this terminal.

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.

Ground .

Ground for Receiver.

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 1.5kΩ.

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.

Supply voltage.

Supplies power to the Receiver.

5

Share Link: