WM8971L 查看數據表（PDF） - Wolfson Microelectronics plc

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WM8971L

Stereo CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

WM8971L

Advanced Information

Test Conditions

DCVDD = 1.5V, DBVDD = 3.3V, AVDD = HPVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, PGA gain = 0dB, 24-bit audio

data unless otherwise stated.

PARAMETER

SYMBOL TEST CONDITIONS

MIN

TYP

MAX

UNIT

Headphone Output (LOUT1/ROUT1, using capacitors)

Output Power per channel

PO

Output power is very closely correlated with THD; see below.

Total Harmonic Distortion

THD

HPVDD=1.8V, RL=32Ω

0.016

%

PO=5mW

-76

dB

HPVDD=1.8V, RL=16Ω

PO=5mW

0.022

-73

HPVDD=3.3V, RL=32Ω,

PO=20mW

0.013

-78

HPVDD=3.3V, RL=16Ω,

PO=20mW

0.018

-75

Signal to Noise Ratio

SNR

HPVDD = 3.3V

92

96

dB

(A-weighted)

HPVDD = 1.8V

96

Speaker Output (LOUT2/ROUT2 with 8Ω bridge tied load, ROUT2INV=1)

Output Power at 1% THD

PO

THD = 1%

400

mW (rms)

Abs. Max Power Output

Total Harmonic Distortion

POmax

THD

Po=180mW, RL=8Ω,

HPVDD=3.3V

500

mW (rms)

-60

dB

0.1

%

Signal to Noise Ratio

(A-weighted)

Analogue Reference Levels

Midrail Reference Voltage

Buffered Reference Voltage

Microphone Bias

Bias Voltage

Bias Current Source

Output Noise Voltage

Digital Input / Output

Input HIGH Level

Input LOW Level

Output HIGH Level

Output LOW Level

HPDETECT (pin 23)

Input HIGH Level

Input LOW Level

SNR

HPVDD=3.3V, RL=8Ω

95

dB

VMID

VREF

VMICBIAS

IMICBIAS

Vn

VIH

VIL

VOH

VOL

VIH

VIL

–3%

AVDD/2

+3%

V

–3%

AVDD/2

+3%

V

3mA load current

1K to 20kHz

–5%

0.9×AVDD

15

+ 5%

3

V

mA

nV/√Hz

IOL=1mA

IOH-1mA

0.7×DBVDD

0.9×DBVDD

V

0.3×DBVDD

V

V

0.1×DBVDD

V

0.7×AVDD

V

0.3×AVDD

V

w

AI Rev 3.0 March 2004

8

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