TA8187AFN

TA8187AFN TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8187AFN 1.5V Dual FM IF The TA8187AFN is dual FM IF system IC, developed for headphone stereo etc. It is built in dual FM IF systems, dual buffer amplifiers and soft muting function etc. Features · Built−in dual FM IF systems · Built−in dual buffer amplifiers · Built−in soft muting function (only dual IF mode) ATT = 21dB (typ.) · Low supply current (VCC = 1.2V, Ta = 25°C) Single IF mode: 2.8mA (typ.) Dual IF mode: 3.2mA (typ.) · Built−in mode switch · Output of buffer amplifier is high−impedance in power off mode. · Operating supply voltage range (typ.) VCC (opr) = 0.95~2.2V Weight: 0.09g (typ.) Block Diagram 1 2002-10-30 TA8187AFN Terminal Explanation Terminal Voltage: Typical Terminal Voltage with Test Circuit (VCC = 1.2V, Ta = 25°C) Terminal No. Name 1 VCC1 Function VCC, for IF amplifier Internal Circuit Terminal Voltage (V) 1.2 2 IF INB 15 IF INA Input of IF amplifier ・Input impedance: 330Ω (typ.) 1.2 3 Mode SW 4 VCC2 Mode switch VCC: Single IF mode GND / OPEN: Dual IF mode VCC, except VCC1 — — 1.2 5 VREF Reference circuit 0.75 6 QUADB 11 QUADA 7 OUTB 8 OUTA 12 DET OUT QUAD detector circuit ・DET coil should be connected with VCC. Output of audio signal ・Output impedance: 1kΩ (typ.) Detector output ・This output level is recovered output voltage of the signal is applied to the terminal of IF INA. It isn’t under the influence of mode switch condition. ・Output impedance: 1kΩ (typ....