UDA1384H Просмотр технического описания (PDF) - Philips Electronics
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UDA1384H Datasheet PDF : 55 Pages
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Philips Semiconductors
UDA1384
Multichannel audio coder-decoder
Table 8: Decimation filter characteristics (voice ADC)
Item
Condition
Pass-band ripple
Pass-band droop
Stop band
Dynamic range
0fs to 0.45fs
0.45fs
> 0.55fs
0fs to 0.45fs
Value (dB)
±0.05
−0.2
−65
> 110
8.6 Interpolation filter of DAC
The digital interpolation filter interpolates from 1fs to 128fs (or to 64fs in the 192 kHz
sampling mode) by cascading FIR filters, and has two sets of filter coefficients for sharp
and slow roll-off as given in Table 9 and Table 10.
Table 9: Interpolation filter characteristics (sharp roll-off)
Item
Condition
Pass-band ripple
0fs to 0.45fs
Stop band
> 0.55fs
Dynamic range
0fs to 0.45fs
Value (dB)
±0.002
−75
> 135
Table 10: Interpolation filter characteristics (slow roll-off)
Item
Condition
Pass-band ripple
Pass-band droop
Stop band
Dynamic range
0fs to 0.22fs
0.45fs
> 0.78fs
0fs to 0.22fs
Value (dB)
±0.002
−3.1
−94
> 135
8.7 Noise shaper of DAC
The 3rd-order noise shaper operates at either 128fs or 64fs (in the 192 kHz sampling
mode), and converts the 24-bit input signal into a 5-bit signal stream. The noise shaper
shifts in-band quantization noise to frequencies well above the audio band. This noise
shaping technique enables high signal-to-noise ratios to be achieved.
8.8 Digital mixer
The UDA1384 has 6 digital mixers inside the interpolator (see Figure 4). The ADC signals
can be mixed with the I2S-bus input signals. The mixing of the ADC signals can be
selected by the bits MIX[1:0].
9397 750 14366
Product data sheet
Rev. 02 — 17 January 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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