TC9470FN Datasheet, PDF (1/19 Pages) Toshiba Semiconductor – Modulation DA Converter with Built-in 8-Times Oversampling Digital Filter/Dynamic Digital Bass Boost/Analog Filter

TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC9470FN
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
Weight: 0.14 g (typ.)
· 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
Standard operation
Digital Filter
8 fs
Passband Ripple
±0.11dB
Transient
Bandwidth
20 k to 24.1 kHz
Attenuation
−26dB or less
DA Converter (V_DD = 2.7 V)
Standard operation
OSR
192 fs
Noise Distortion
−82dB (typ.)
S/N Ratio
90dB (typ.)
1
2002-02-27