AK4691EG AKM [Asahi Kasei Microsystems], AK4691EG Datasheet - Page 55

• Manufacturer Part Number: AK4691EG
• Description: 4ch ADC + 2ch DAC with MIC/HP/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

■
Power supply voltage for the Headphone-Amp is supplied from the LVDD pin and centered on the LVDD/2 voltage. The
load resistance is 16Ω (min). HPG bit selects the output voltage
When the HPMTN bit is “0”, the common voltage of Headphone-Amp falls and the outputs (HPL and HPR pins) become
to “L” (VSS4). When HPMTN bit is “1”, the common voltage rises to LVDD/2. A capacitor between the MUTET pin and
ground reduces pop noise at power-up. Rise/Fall time constant is in proportional to LVDD voltage and the capacitor at the
MUTET pin.
Note 55. Rising time of HP-Amp (0.8 x LVDD/2)
Note 56. Time until the common voltage settles to VSS4
When PMHPL and PMHPR bits are “0”, the Headphone-Amp is powered-down, and the outputs (HPL and HPR pins)
become to “L” (VSS4).
MS0672-E-00
Headphone Output
PMHPL/R bits
Table 49. Relationship between capacitor value of MUTET pin and MUTE ON/OFF time (HPG bit = “0”)
LVDD
0
1
3.6V
5.5V
3.6V
5.5V
Output Voltage [Vpp]
HPG bit
HPMTN bit
Capacitor value of
x
0
1
MUTET pin
2.2μF±30%
Table 50. Headphone-Amp Mode Setting (x: Don’t care)
1μF±30%
Table 48. Headphone-Amp Output Voltage
Rise up to common
common voltage
Power-down
Fall down to
voltage
Mode
0.6 x AVDD
HPMTN bit= “0”
120ms
160ms
260ms
340ms
- 55 -
typ.
0
(Note
(Table
Normal operation
“L”(VSS4)
“L”(VSS4)
55)
HPL pin
210ms
270ms
460ms
590ms
48).
max
“1”
HPMTN bit = “1”
0.91 x AVDD
140ms
170ms
310ms
370ms
Normal operation
typ.
“L”(VSS4)
“L”(VSS4)
1
HPR pin
(Note
56)
260ms
300ms
560ms
600ms
max.
“0”
(default)
[AK4691]
2007/11