Low Power Audio Codec

SSM2604

Rev. 0

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FEATURES

Stereo, 24-bit analog-to-digital and digital-to-analog converters

DAC SNR: 100 dB (A-weighted), THD: −80 dB at 48 kHz, 3.3 V

ADC SNR: 90 dB (A-weighted), THD: −80 dB at 48 kHz, 3.3 V

Stereo line inputs

Low power

7 mW stereo playback (1.8 V/1.5 V supplies)

14 mW record and playback (1.8 V/1.5 V supplies)

Low supply voltages

Analog: 1.8 V to 3.6 V

Digital: 1.5 V to 3.6 V

256/384 oversampling rate in normal mode;

250/272 oversampling rate in USB mode

Audio sampling rates: 8 kHz, 11.025 kHz, 12 kHz, 16 kHz,

22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz,

and 96 kHz

20-lead, 4 mm × 4 mm LFCSP (QFN) package

APPLICATIONS

Mobile phones

MP3 players

Portable gaming

Portable electronics

Educational toys

GENERAL DESCRIPTION

The SSM2604 is a low power, high quality stereo audio codec

for portable digital audio applications with one set of stereo

programmable gain amplifier (PGA) line inputs. It features two

24-bit analog-to-digital converter (ADC) channels and two

24-bit digital-to-analog (DAC) converter channels.

The SSM2604 can operate as a master or a slave. It supports

various master clock frequencies, including 12 MHz or 24 MHz

12.288 MHz and 24.576 MHz; and many common audio sam-

pling rates, such as 96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz, 32 kHz,

24 kHz, 22.05 kHz, 16 kHz, 12 kHz, 11.025 kHz, and 8 kHz.

The SSM2604 can operate at power supplies as low as 1.8 V for

the analog circuitry and as low as 1.5 V for the digital circuitry.

The maximum voltage supply is 3.6 V for all supplies.

The SSM2604 is specified over the industrial temperature range

of −40°C to +85°C. It is available in a 20-lead, 4 mm × 4 mm

lead frame chip scale package (LFCSP).

FUNCTIONAL BLOCK DIAGRAM

AVDD VMID AGND

DVDD DGND

ROUT

DIGITAL

PROCESSOR

RLINEIN

ADC

LLINEIN

ADC

DAC

DAC

LOUT

BYPASS

BYPASS

CLK

MCLK/

XTI

XTO CLKOUT

CONTROL INTERFACE

SDIN

SCLK

DIGITAL AUDIO INTERFACE

PBDAT RECDAT BCLK PBLRC RECLRC

–34.5dB TO +33dB,

1.5dB STEP

–34.5dB TO +33dB,

1.5dB STEP

SSM2604

Figure 1.