1FEATURES
· Analog Front End:
– Stereo Single End Input With MUX
– Mono Differential Input
– Stereo Programmable Gain Amplifier
– Microphone Boost Amplifier and Bias
· Analog Performances Dynamic Range: 90 dB
· Power-Supply Voltage
– 1.71 V to 3.6 V for Digital I/O Section
– 1.71 V to 3.6 V for Digital Core Section
– 2.4 V to 3.6 V for Analog Section
· Low Power Dissipation:
– 13 mW in Record, 1.8/2.4 V, 48 kHz, Stereo
– 5.3 mW in Record, 1.8/2.4 V, 8 kHz, Mono
– 3.3 mW in All Power Down
· Sampling Frequency: 5 kHz to 50 kHz
· Auto Level Control for Recording
· Operation by Single Clock Input Without PLL
· System Clock: Common Audio Clock
(256 fS/384 fS), 12/24, 13/26, 13.5/27, 19.2/38.4,
19.68/39.36 MHz
· 2 (I2C) or 3 (SPI) Wire Serial Control
· Programmable Function by Register Control:
– Digital Soft Mute
– Hi-Z for LRCK, BCK and DOUT
– Power Up/Down Control for Each Module
– 30-dB to –12-dB Gain for Analog Inputs
– 0/12/20-dB Boost for Microphone Input
– Parameter Settings for ALC
– Three-Band Tone Control and 3D Sound
– High-Pass Filter and Two-Stage Notch Filter
· Pop Noise Reduction Circuit
· Package:
– 24-Pin YZF (2.49 mm × 3.49 mm)
· Operation Temperature Range: –40°C to 85°C

APPLICATIONS
· Portable Audio Player, Cellular Phone
· Video Camcorder, Movie Digital Still Camera
· PMP/DMB, Voice Recorder

DESCRIPTION
The PCM1870A is a low-power stereo ADC designed
for portable digital audio applications, with line-input
amplifier, boost amplifier, microphone bias,
programmable gain control, sound effects, and auto level control (ALC). It is available in a 24-Pin YZF
(2.49-mm × 3.49-mm) package to save footprint. The
PCM1870A accepts right-justified, left-justified, I2S,
and DSP formats, providing easy interfacing to audio DSP and encoder chips. Sampling rates up to 50 kHz
are supported. The user-programmable functions are
accessible through a 2- or 3-wire serial control port.