NJU7512VT 1200 bps MSK Modem for Data Communication GENERAL DESCRIPTION PACKAGE OUTLINE The NJU7512 is a 1200bps MSK (Minimum Shift Keying) modem IC, which operates from 1.8V power supply. It includes 14.7456MHz oscillator and selectable OSC buffer for an external output, and a frame detector for receiving. MSK modem is especially used for low power data communication, which requires high receiving sensitivity and noise susceptibility characteristics. NJU7512VT FEATURES Low Operating Current 1.9mA (Modulation and Demodulation operation, VDD=1.8V) Wide Operating Voltage range 1.8 to 5.5V Baud Rate 1200 bps Oscillating Frequency 14.7456 MHz Selectable OSC Buffer Output 14.7456 MHz or 3.6864 MHz Built-in Frame Detector 2 types of frame data or disable Power Save Function Power control for Modulator and Demodulator blocks respectively Easy to use modem function A few external parts required Wide Operating Temperature range - 40 to +105 C CMOS Technology Package Outline SSOP20 6.5mm x 6.4mm, t=0.65mm Please refer the IC Package information about the Package outline and Packing. BLOCK DIAGRAM AIN AGS 1 2 RDT Clock 5 Frame -- BPF Detector Recocer Detector + RTM 4 y Limiter Amp. 17 FRS 3 PLLS FRK 18 14 PDRX PDTX 13 Standard Bias Analog Internal Timing Clock Voltage Voltage Ground 15 TD MSK Sine Timing 12 BR Mod. Wave Generator TRD 16 XOUT 8 Standard Bias LPF XIN 9 VDD2 6 20 10 11 7 19 FSE XBO MX VSS VDD1 Ver.2018-03-19 - 1 - NJU7512VT PIN CONFIGURATION V D D 1 A I N 1 20 A G S M X 2 19 P L L S F R K 3 18 F R S R T M 4 17 R D T T R D 5 16 V D D 2 T D 6 15 X B O P D R X 7 14 X O U T P D T X 8 13 X I N B R 9 12 V S S F S E 10 11 NJU7512VT Ver.2018-03-19 - 2 -