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PDF TC9470FN Data sheet ( Hoja de datos )
| Número de pieza | TC9470FN | |
| Descripción | Modulation DA Converter | |
| Fabricantes | Toshiba Semiconductor | |
| Logotipo |  |
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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 (VDD = 2.7 V)
Standard operation
OSR
192 fs
Noise Distortion
−82dB (typ.)
S/N Ratio
90dB (typ.)
1 2002-02-27
1 page  
5 Page 
TC9470FN
8. Soft Mute Circuit
The IC is equipped with a soft mute function, and this enables a soft mute to be set for the DA converter
output by switching the SM pin (pin 18) from the “L” level to the “H” level when in the parallel mode
( P/S = “H”). The soft mute’s ON/OFF function and the DA converter output are shown in Figure 12.
The Soft mute ON/OFF control function is disabled during level transition.
SM Pin Input
DA Converter
Output Level
Off
On
1
64
Off
1
64
Approximately 23 ms
Approximately 23 ms
Figure 12 Changes in the Soft Mute DA Converter Output Level
9. Common Left Channel/Right Channel Digital Zero Data Detection Output Circuit
The IC is equipped with a common left channel/right channel digital zero data detection output circuit,
and the ZD pin (pin 11) is switched from “L” to “H” when data for both the left channel and the right
channel becomes zero data for approximately 350 ms or longer.
This is fixed at “L” when the data for the left channel and right channel is not zero data.
10. Description of Internal Control Signals
The P/S pin can be used to switch between the parallel mode ( P/S pin = “H” in DC setting mode) and
the serial mode ( P/S pin = “L” with the microcontroller interface function).
10.1
Parallel Mode ( P/S = “H”: DC setting mode)
Pins 18, 19, 20 and 21 are used as the mode setting pins shown in the table below when in the
parallel mode.
Table 6 Pin Names at the Parallel Mode
Pin No.
18
19
20
21
Pin Name
Pin Description
SM
EMP
DBB1
DBB2
Soft mute control pin
De-emphasis control pin
Digital bass boost mode control pin 1
Digital bass boost mode control pin 2
11 2002-02-27
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TC9470FN.PDF ] | |
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