AK4319A 查看數據表（PDF） - Asahi Kasei Microdevices

零件编号

产品描述 (功能)

生产厂家

AK4319A

18Bit SCF DAC

Asahi Kasei Microdevices 

ASAHI KASEI

„ De-emphasis filter

[AK4319A]

The AK4319A includes the digital de-emphasis filter(tc=50/15us) by IIR filter. This filter corresponds to

three sampling frequencies(32kHz,44.1kHz,48kHz). De-emphasis is enabled by the following two ways.

DEM1

0

0

1

DEM0

0

1

0

Mode

44.1kHz

OFF

48kHz

1

1

32kHz

Table 3 . De-emphasis filter control

„ Zero detection

After the input data at both channels are continuously zeros for 8192 LRCK cycles or when the muting

period exceeds 8192+1022 LRCK cycles, DZF goes to "H". DZF goes "L" immediately after non zero

data is input or soft mute is released.

„ Soft mute operation

When SMUTE goes "H", the output signal is attenuated into -∞ during 1022 LRCK cycles. SMUTE is

returned to "L", the mute condition is released and the output attenuation gradually changes to 0dB

during 1022 LRCK cycles. If the soft mute is released within 1022LRCK cycles, the attenuation is

recovered to 0dB with same gradient and cycles.

The soft mute function is effective when changing the signal source without stopping the signal

transmission.

Notes:

{1 The output signal is attenuated into -∞ during 1022 LRCK cycles(1022/fs).

{2 Analog output corresponding to digital input have the group delay(GD).

{3 If the soft mute is released within 1022 LRCK cycles, the attenuation is recovered to 0dB.

{4 When the input data at both channels are continuously zeros for 8192 LRCK cycles, DZF goes to

"H". DZF goes "L" immediately after non-zero data is input.

Figure 6 . Soft mute and zero detection

M0011-E-01

- 11 -

1998/6

Share Link: