PDF S1T8528 Data sheet ( Hoja de datos )

Número de pieza	S1T8528
Descripción	ENHANCED-1 CHIP CT0 RF IC
Fabricantes	Samsung semiconductor
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No Preview Available ! ENHANCED-1 CHIP CT0 RF IC S1T8528 INTRODUCTION S1T8528 is a 1 CHIP RF IC which can be used in high performance CTO CLP systems at max. 60MHz. S1T8528 is designed to include a receiver, PLL and COMPANDER to minimize PCB space requirements. Improved RX characteristics such as inter-modulation, spurious response and adjacent channel interface have been included to satisfy the universal standards. The 1 CHIP RF IC has considerably reduced the cost by including a build-in 1’st mixer, low battery detector, fMCU, RSSI, RF regulator and speaker amp. Also, it fulfills carrier detector threshold control, speaker volume control, operating mode selection and MUTE function using S/W, thus making external application easier. 48−QFP−1010E FEATURES • Operating voltage range: 2.0V ~ 5.5V • Typical supply current: 8.9mA at 3.6V • Built-in low battery detection function ( selectable 3.45V, 3.3V, 3.0V, 2.2V, 2.1V ) • Built-in speaker volume control and speaker amplifier • Built-in splatter filter • Support mode selection ( Active, Rx, Standby and Inactive mode ) • FM Receiver — Excellent Receiver characteristics < 10.7MHz crystal filter used > Input sensitivity 0.7µVrms at 12dB SINAD Adjacent channel rejection > 55dB Spurious rejection (image of the second IF) > 60dB Intermodulation rejection > 50dB — RSSI ( Linear ) and Carrier detector output ( Digital ) function • Compander — Easy gain control and application using external component — -Included ALC (Automatic Level Control) circuit • Universal PLL — RX (TX) divided counter range : 1/16 ~ 1/16383 — Reference frequency divided counter range : 1/16 ~ 1/4095 — Lock detector signal output — Serial interface with MICOM for controlling each block — Clock Output for MICOM oscillator substitution. ( X-tal divided clock by 2, 3, 4 and 5 ) ORDERING INFORMATION Device + S1T8528X01-Q0R0 + : New product Package 48−QFP−1010E Operating Temperature −20C to + 70C 1 1 page 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 5 Page ENHANCED-1 CHIP CT0 RF IC S1T8528 PLL PROGRAM SUMMARY • MCU ( MICOM ) Serial Interface ( MSB : 1st INPUT ) Use CLK (Pin 7 ), DATA (Pin 8 ) , and EN (Pin 9 ) terminals for program. DATA and CLK terminals are used for loading data to internal Shift - Register. When EN terminal is ‘Low’, It is possible to program TX-Channel Counter, RX - Channel Counter and various control functions of PLL. When EN terminal is ‘High’, Program 1st Local Oscillator Capacitor Selection in receiver for U.S.A - 25 CH function. — TX - Register, RX-Register, Control Register DATA MSB PMC0 PMC1 14Bit DATA LSB EN CLK — Reference - Register DATA MSB PMC PMC UK_ UK_ 0 1 S1 S0 EN CLK Figure 1. 12Bit DATA Figure 2. LSB 11 11 Page

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