DESCRIPTION
The CXA1691M is a one-chip FM/AM radio IC designed for radio-cassette tape recorders and headphone tape recorders.

FEATURE
Small number of peripheral components
Low current consumption (Vcc=3V)
  FM: I D=5.3mA (Typ.)
  AM: I D=3.4mA(Typ.)
Built-in FM/AM select switch
Large output of AF amplifier

FUNCTIONS
FM section
RF amplifier; Mixer and OSC (in corporating AFC variable capacitor);
IF amplifier,
Quadrature detection;
Tuning LED driver.

AM section
RF amplifier, Mixer and OSC (with RF AGC);
IF amplifier (with IF AGC)
Detector
Tuning LED driver

AF section
Electronic volume control
FM muting