DESCRIPTION
The µPD63335 is a stereo sound codec LSI that enables full-duplex communications and features two channels each of on-chip 16-bit ADC and DAC circuits for mutual conversion between digital signals and audio analog signals (having a maximum signal bandwidth of 20 kHz).
The analog signal input block enables four pairs of stereo signals plus three monaural signals to be output from the output stages internal mixing circuit, which can then be multiplexed and input to the ADC. One type of monaural signal can be selected from two external pins via a selector as a monaural signal connected to an internal microphone amplifier (MIC amp), with selectable gain of 0 dB or 20 dB.

FEATURES
• Two channels each of over sample ∆Σ type ADC and DAC
    • ADC SNR = 85 dB Typ.
    • DAC SNR = 90 dB Typ.
• ADC and DAC digital filter characteristics
    • Pass band ripple: ±0.1 dB (0 to 0.4 fS) for ADC and DAC
    • Stop band attenuation: −74 dB (0.6 fS) or above for ADC and DAC
• Sampling frequency (fS): 0.4 to 48 kHz
    • Division rate from master clock can be set to 3072, 1536, 768, or 512
• Analog input block includes a multiplexer and analog output block includes a mixing circuit
• Low-noise monaural MIC amp is on chip
• On-chip reference voltage power supply (1.4 V (TYP.))
• Low supply voltage operation: DVDD = 3.3 V, AVDD = 3.3 V
• Support for power down mode in each internal block
• Operating ambient temperature: −40 to +85°C

APPLICATIONS
• Speech recognition systems, including car navigation systems
• Electronic toys with speech/audio I/O functions