TC9470FN

2002-02-27

1

TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic

TC9470FN

Σ-∆ Modulation DA Converter with Built-in 8-Times Oversampling Digital Filter/Dynamic

Digital Bass Boost/Analog Filter

The TC9470FN is a second-order Σ-∆ modulation system

1-bit DA converter incorporating an 8-times oversampling digital

filter, dynamic digital bass boost function for use with compressor

operations and an analog filter developed for digital audio

equipment.

Because the IC includes an analog filter, it can output a direct

analog waveform, thus reducing the size and cost of the DA

converter.

Features

· Built-in 8-times oversampling digital filter

· Low-voltage operations (2.4 V) possible

· Built-in digital de-emphasis filter

· Built-in dynamic digital bass boost function

· In serial control mode, output amplitude can be set in 4096 steps of resolution using microcontroller commands

· In parallel control mode, soft mute can be set for the output signal in 64 steps in 23 ms

· Built-in LR common digital zero detection output circuit

· Sampling frequency: 44.1 kHz

· Supports 384 fs/256 fs (automatic switching)

· DA converter oversampling ratio (OSR): 192 fs (at 384 fs)

· Stereo/monaural output selection possible

· Built-in third-order analog filter

· The digital filter and DA converter characteristics are shown on the next page

Digital Filter

Digital Filter

Passband Ripple

Transient

Bandwidth

Attenuation

Standard operation

8 fs

±0.11dB

20 k to 24.1 kHz

−26dB or less

OSR

Noise Distortion

S/N Ratio

Standard operation

192 fs

−82dB (typ.)

90dB (typ.)

Weight: 0.14 g (typ.)