WM8750L Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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WM8750L

Stereo CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

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WM8750L

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

Total Harmonic Distortion

PO

THD

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

HPVDD=1.8V, RL=32Ω

0.013

%

PO=5mW

-78

dB

HPVDD=1.8V, RL=16Ω

PO=5mW

0.013

-78

HPVDD=3.3V, RL=32Ω,

PO=20mW

0.01

-80

HPVDD=3.3V, RL=16Ω,

PO=20mW

0.01

-80

Signal to Noise Ratio

SNR

HPVDD = 3.3V

90

dB

(A-weighted)

HPVDD = 1.8V

90

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

Output Power

Total Harmonic Distortion

PO

THD

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

Po=180mW, RL=8Ω,

-50

dB

HPVDD=3.3V

0.3

%

Po=400mW, RL=8Ω

-40

HPVDD=3.3V

1

Signal to Noise Ratio

SNR

HPVDD=3.3V, RL=8Ω

90

dB

(A-weighted)

HPVDD=2.5V, RL=8Ω

90

Analogue Reference Levels

Midrail Reference Voltage

VMID

–3%

AVDD/2

+3%

V

Potential Divider Resistance

RVMID

50

kΩ

Buffered Reference Voltage

VREF

–3%

AVDD/2

+3%

V

Microphone Bias

Bias Voltage

VMICBIAS

–3%

0.9×AVDD

+ 3%

V

Bias Current Source

Output Noise Voltage

IMICBIAS

Vn

1K to 20kHz

3

mA

15

nV/√Hz

Digital Input / Output

Input HIGH Level

Input LOW Level

Output HIGH Level

Output LOW Level

HPDETECT (pin 23)

VIH

0.7×DBVDD

VIL

VOH

IOL=1mA

0.9×DBVDD

VOL

IOH-1mA

V

0.3×DBVDD

V

V

0.1×DBVDD

V

Input HIGH Level

VIH

Input LOW Level

VIL

0.7×AVDD

V

0.3×AVDD

V

PP Rev 1.77 May 2003

7

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