INTRODUCTION
The S1T8515A is a designed for FM detection on the FLEX pager set. It consists of an Oscillator, Mixer, Limiting IF Amp. Quadrature Detector, Regulator, RSSI (Received Signal Strength Indicator), Bit Rate Filter, and a 2-level / 4-level FSK comparator. It has a 24-SSOP (0.65mm)Surface Mount Package.

FEATURES
• Internal A/D converter for 4 level FSK (2-bit ADC)
• High transmission rate: 6400bps (Max.)
• Operating voltage range: VCC1 = 1.1 ~ 4.0V
• Typical supply current: 1.5mA at 1.4V
• Low battery detection circuit (alarm function): 1.05V
• Mixer operating frequency: 10 ~ 50MHz
• Package type: 24-SSOP (0.65mm)