TC94A04AF/AFD is a single-chip audio Digital Signal Processor, incorporating 4 way stereo analog switch, 2 ch AD converter, 4 ch DA converter, and electronic volume for trimming.

It is possible to realize many applications, such as sound field control -hall simulation, for example-, digital filter for equalizers, surround, base boost and something.

Features

• Incorporates a 4 ch-stereo analog switch for AD converter input.

• Incorporates a 1 ch stereo line-out.

• Incorporates a 1 bit ∑ ∆-type AD converter (two channels).

THD: −82dB (typ.) S/N: 95dB (typ.)

• Incorporates a 1 bit ∑ ∆-type DA converter (four channels).

THD: −86dB (typ.) S/N: 98dB (typ.)

• Incorporates a trimming analog volume for each output of DA converter. 0dB to −24dB (1dB step)

• As digital input/output port, this has 3 input port (6 ch) and 1 output port (2 ch), enabling input/output of sampling of 96 kHz/24 bit.

• Incorporates a built-in digital de-emphasis filter.

• Incorporates a digital attenuator.

• Incorporates a boot ROM to set a coefficient automatically, which enables to transfer an initial data from built-in ROM/RAM to registers at the time of resetting Boot ROM: 512 words

• The DSP block specifications are as follows:

Data bus: 24 bits

Multiplier/adder: 24 bits × 16 bits + 43 bits → 43 bits

Accumulator: 43 bits (sign extension: 4 bits)

Program ROM: 1024 words × 32 bits

Coefficient RAM: 384 words × 16 bits

Coefficient ROM: 256 words × 16 bits

Offset RAM: 16 words × 11 bits

Data RAM: 256 words × 24 bits

Interface buffer RAM: 32 words × 16 bits

Operation speed: 22.5 MIPS (510 step/fs: master clock = 768 fs, fs = 44.1 kHz)

Note 1: At the time of an analog input, approximately 170 steps (85 step/ch) in 510 step are used for the operation of the decimation filter for AD converters.

• Incorporates data delay RAM (32 kbits).

Delay RAM: 2048 words × 16 bits (32 kbits)

• The microcontroller interface can be selected between Toshiba original 3 line mode and I2C mode.

• CMOS silicon structure supports high speed.

• Power supply is a single 5 V.

• The package are 60-pin and 80 pin flat package.