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AK4706_10 Datasheet, PDF (22/54 Pages) Asahi Kasei Microsystems – 2ch 24bit DAC with AV Switch & HD/SD Video Filter | |||
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[AK4706]
â DAC Power-down Mode
The internal DAC block can be powered-down and switched to 1Vrms analog input mode. When DAPD bit =â1â, the
zero-cross detection and offset calibration does not work.
DAPD bit (00H D2): DAC power-down bit.
â1â: DAC power-down. Analog-input mode.
#52 pin: MCLK Ã Unused pin. This pin should be open.
#53 pin: BICK Ã DACR. Rch analog input.
#54 pin: SDTI Ã Unused pin. This pin should be open.
#55 pin: LRCK Ã DACL. Lch analog input.
â0â: DAC operation. (default)
â Standby Mode
When the AUTO bit = MUTE bit = â0â and the STBY bit = â1â, the AK4706 is forced into TV-VCR loop through mode.
In this mode, the sources of TVOUTL/R and MONOOUT pins are fixed to VCRINL/R pins; the sources of VCROUTL/R
are fixed to TVINL/R pins respectively. The gain of volume#1 is fixed to 0dB. All register values themselves are NOT
changed by STBY bit = â1â.
STBY bit (00H D0): Standby bit.
â1â: Standby mode. (default)
â0â: Normal operation.
â Mute Mode (Bias-off Mode. 00H: D1)
When the MUTE bit = â1â, the bias voltage on the audio output goes to GND level. Bringing MUTE bit to â0â changes
this bias voltage smoothly from GND to VP/2 by 2sec(typ.). This removes the huge click noise related the sudden change
of bias voltage at power-on. The change of MUTE bit from â1â to â0â also makes smooth transient from VP/2 to GND by
2sec(typ). This removes the huge click noise related the sudden change of bias voltage at power-off.
MUTE bit: Bias-off bit.
â1â: Set the audio bias to GND. (default)
â0â: Normal operation
â Normal Operation Mode
To use the DAC or change analog switches, set the AUTO bit, DAPD bit, MUTE bit and STBY bit to â0â. The DAC is in
power-down mode until MCLK and LRCK are input. The AK4706 is in power-down mode until MCLK and LRCK are
input. The Figure 2 shows an example of the system timing at the power-down and power-up by PDN pin.
MS0507-E-01
- 22 -
2010/09
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