WM8912 查看數據表（PDF） - Wolfson Microelectronics plc

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产品描述 (功能)

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WM8912

Ultra Low Power DAC with Headphone Driver for Portable Audio Applications

Wolfson Microelectronics plc 

Production Data

CHARGE PUMP

PARAMETER

TEST CONDITIONS

Start-up Time

CPCA

Normal mode

Low power mode

CPCB

Normal mode

Low power mode

External component requirements

To achieve specified headphone output power and performance

Flyback Capacitor

at 2V

(between CPCA and CPCB)

CPVOUTN Capacitor

at 2V

CPVOUTP Capacitor

at 2V

WM8912

MIN

TYP

260

CPVDD

CPVDD/2

-CPVDD

-CPVDD/2

MAX

UNIT

μs

V

V

V

V

1

2.2

μF

2

2.2

μF

2

2.2

μF

FLL

PARAMETER

Input Frequency

Lock time

Free-running mode start-up time

Free-running mode frequency accuracy

SYMBOL

FREF

TEST CONDITIONS

FLL_CLK_REF_DIV = 00

FLL_CLK_REF_DIV = 01

VMID enabled

Reference supplied

initially

No reference provided

MIN

0.032

0.064

TYP

2

100

+/-10

+/-30

MAX

13.5

27

UNIT

MHz

MHz

ms

μs

%

%

OTHER PARAMETERS

VMID Reference

PARAMETER

TEST CONDITIONS

MIN

Midrail Reference Voltage (VMID pin)

-3%

Charge up time (from fully discharged

to +5% or -10% of VMID)

External capacitor

4.7μF

TYP

AVDD/2

890

MAX

+3%

UNIT

V

μs

Digital Inputs / Outputs

PARAMETER

SYMBOL TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input HIGH Level

Input LOW Level

Output HIGH Level

Output LOW Level

VIH

0.7×DBVDD

VIL

VOH

IOH = +1mA

0.9×DBVDD

VOL

IOL = -1mA

V

0.3×DBVDD

V

V

0.1×DBVDD

V

w

PD, Rev 4.0, September 2010

11

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