Low Power Audio Codec

Preliminary Technical Data

SSM2602

Rev. PrB

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FEATURES

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

DAC SNR: 98 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

Highly efficient headphone amplifier

Complete stereo/mono or microphone/line interface

Low power

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

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

Low supply voltages

Analog: 1.8 V to 3.6 V

Digital core: 1.8 V to 3.6 V

Digital I/O: 1.8 V/3.6 V

Audio sample rates: 8 kHz,16 kHz, 32 kHz, 44.1 kHz, 48 kHz,

88.2 kHz, and 96 kHz

28-lead, 5 mm × 5 mm LFCSP (QFN) package

APPLICATIONS

Mobile phones

MP3 players

Portable gaming

Portable electronics

Educational toys

GENERAL DESCRIPTION

The SSM2602 is a low power, high quality stereo audio codec

for portable digital audio applications with stereo programmable

gain amplifier (PGA) line and monaural microphone inputs. It

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

and two 24-bit digital-to-audio (DAC) converter channels.

The SSM2602 can operate as a master or a slave. It offers

various master clock frequencies, including 12 MHz or 24 MHz

24.576 MHz; and many common audio-sampling rates, such as

96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz, 32 kHz, 16 kHz, and 8 kHz.

The SSM2602 can operate at power supplies as low as 1.8 V for

the analog circuitry and 1.5 V for the digital circuitry. The

maximum voltage supply is 3.6 V for all supplies.

The SSM2602 software-programmable output options provide

the user with many application options, such as speaker driver,

headphone driver, or both. Its volume control functions provide

a large range of gain control of the audio signal.

The SSM2602 is specified over the industrial temperature range

of −40°C to +85°C. It is available in a 28-lead, 5 mm × 5 mm

lead frame chip scale package (LFCSP).

FUNCTIONAL BLOCK DIAGRAM

AVDD

VMID

AGND

DBVDD DGND DCVDD

HPVDD PGND

MICBIAS

RHPOUT

ROUT

MICIN

DIGITAL

PROCESSOR

RLINEIN

MUX

ADC

LLINEIN

MUX

ADC

DAC

DAC

LOUT

LHPOUT

ATTEN

ATTEN

ATTEN

ATTEN

CLK

MCLK/

XTI

XTO CLKOUT

CONTROL INTERFACE

MODE CSB

SDIN SCLK

DIGITAL AUDIO INTERFACE

DACDAT ADCDAT BCLK DACLRC ADCLRC

BYPASS/MUTE 3dB STEP

–34.5dB~+33dB,

1.5dB STEP

14dB/34dB

–34.5dB~+33dB,

1.5dB STEP

–73dB~+6dB,

1dB STEP

–73dB~+6dB,

1dB STEP

6dB~15dB/MUTE 3dB STEP

6dB~15dB/MUTE 3dB STEP

BYPASS/MUTE 3dB STEP

SSM2602

Figure 1.