Specifications

PF1144-02

S1C33 Family D/A Technology PCM15

● High-precision D/A technology for the S1C332xx series

● Maximum 15 bits of precision in voice band using hybrid PWM

technology; may be output in sampling frequencies up to 48kHz

● Able to realize CD-quality sound using only a microcomputer

and several RC components

■ FEATURES

• Seiko Epson's original hybrid PWM technology allows the product to support a maximum 15 bits of precision

and 8kHz to 48kHz sampling frequencies, enabling CD-quality sound at extremely low cost.

• The hybrid PWM technology is comprised of the following three PWM technologies:

1. Fine-PWM technology

Control of PWM in units of half-clock cycles allows production of vouice/music output with a maximum 10

bits of precision on even a single channel.

2. Dual PWM technology

Synthesizing two channels of the above fine PWM allows it so produce voice/music output with a maximum

15 bits of precision.

3. Software-adjusted PWM technology

By correcting PWM output through software processing, it realizes 0.01% accurate high-precision linearity

error.

• Support will be provided for a wide range of products, from uncompressed PCM data to sound reproduction

and voice expansion middleware to be released in the near future.

• Able to accommodate stereo output.

• May be used in all microcomputers, from the S1C332xx series to ASIC microcomputers built on 33 macros.

• Ideally suited for data banks with music functions, PDAs, electronic stationery, electronic toys, and mobile

audio equipment.

■ HARDWARE CONFIGURATION

PWM

synthesis

and

low-pass filter

Speaker

amp

PWM1 (16-bit timer 1)

PWM2 (16-bit timer 2)

Corrected and controlled by software Minimum configuration

possible with just five

Rs and two Cs

15-bit D/A output

S1C332xx chip

S1C33000

Core CPU

PLL

x2, x4

Refer to the "S1C33 Family Application Note", for details.