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.

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
   — 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 )