AK4213 Datasheet, PDF (24/38 Pages) Asahi Kasei Microsystems – Mono Class-D SPK-Amp with Stereo Cap-less HP-Amp

[AK4213]
■ Power-Up/Down Sequence
1) HP-Amp
Power Supply
PDN pin
(1)
(2)
PMVCM bit
PMOSC bit
PMMHL/R bit
PMCP bit
PVEE pin
PMVx bits
Input Volume
Output State
PMHPL/R bit
(3)
0V
≥ 0s
(4)
Hi-z
(5)
PVEE
VCOM
0V
(10)
Hi-z
HPMTN bits
HPL/HPR pins
0V
MUTE
Normal MUTE
0V
(6) (7)
(8) (9)
Figure 17. HP-Amp Power-up/down sequence example
(1) After Power Up, PDN pin = “L” Æ “H”. “L” time of 150ns or more is needed to reset the AK4213.
The power must be ON in the state of the PDN pin = “L”. The PDN pin must be set to “H” after power supply
(AVDD, TVDD, PVDD, SVDD) ON.
(2) PTS1-0, MOFF, HPGA4-0, and SD3-1 bits must be set during this period.
(3) Regulator, Power-up of Charge Pump, internal oscillator, VCOM, and HP-Amp Mixer & Selector: PMCP =
PMMHL = PMMHR = PMOSC = PMVCM bits = “0” Æ “1”
The PVEE pin becomes PVEE voltage within 10ms (max.).
(4) Power-up of input volume: PMVx bit = “0” Æ “1”
Input Volume setting (L1V3-0, L2V3-0, L3V3-0, R1V3-0, R2V3-0, R3V3-0 bits)
Input path setting (HPLL3-1, HPLR3-1, HPRR3-1, HPRL3-1 bits)
Input volume block is powered-up within 26.3ms (max.). Input path and volume can be set when input volume
block is powered-up.
(5) If PMCP and PMHPL/R bits are set to “1” at the same time or PMHPL/R bits are set to “1” during the power-up time
of the Charge Pump circuit, Headphone-Amp is powered-up after the Charge Pump circuit is powered-up.
(6) Power-up of Headphone-Amp: PMHPL/R bits = “0” Æ “1”
Headphone-Amp is in the mute state and becomes ground level. Headphone-Amp power-up time is 26.3ms
(max.).
(7) Headphone-Amp mute release: HPMTN bit = “0” Æ “1”
Headphone-Amp goes to the normal operation after the transition time. Headphone-Amp mute release time
depends on the setting of PTS1-0 and MOFF bits.
(8) Headphone-Amp mute: HPMTN bit = “1” Æ “0”
Headphone-Amp goes to the mute state after the transition time set by PTS1-0 and MOFF bits.
(9) Headphone-Amp power-down: PMHPL/R bits = “1” Æ “0”
Headphone-Amp is powered-down immediately.
(10) Power-down of Charge Pump, internal oscillator, VCOM, and HP-Amp Mixer & Selector: PMCP = PMMHL =
PMMHR = PMOSC = PMVCM bits = “1” Æ “0”
The PVEE pin becomes 0V according to the time constant of the capacitor at the PVEE pin and the internal resistor.
The internal resistor is 17.5kΩ (typ.). Charge Pump Circuit can be powered-up during this period.
MS0949-E-01
- 24 -
2008/07