WM8978 查看數據表（PDF） - Wolfson Microelectronics plc

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WM8978

Stereo CODEC With Speaker Driver

Wolfson Microelectronics plc 

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WM8978

Test Conditions

DCVDD=1.8V, AVDD=DBVDD=SPKVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise

stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Gain Hold Time (Note 3,5)

tHOLD

MCLK = 12.288MHz

0, 2.67, 5.33, 10.67, … , 43691

ms

(Note 3)

(time doubles with each step)

Gain Ramp-Up (Decay) Time

tDCY

ALCMODE=0 (ALC),

3.3, 6.6, 13.1, … , 3360

ms

(Note 4,5)

MCLK=12.288MHz

(time doubles with each step)

(Note 3)

ALCMODE=1 (limiter),

MCLK=12.288MHz

(Note 3)

0.73, 1.45, 2.91, … , 744

(time doubles with each step)

Gain Ramp-Down (Attack) Time

tATK

ALCMODE=0 (ALC),

0.83, 1.66, 3.33, … , 852

ms

(Note 4,5)

MCLK=12.288MHz

(time doubles with each step)

(Note 3)

ALCMODE=1 (limiter),

MCLK=12.288MHz

(Note 3)

0.18, 0.36, 0.73, … , 186

(time doubles with each step)

Mute Attenuation

TBD

dB

Analogue to Digital Converter (ADC)

Signal to Noise Ratio (Note 6,7)

A-weighted, 0dB gain

90

dB

Total Harmonic Distortion

full-scale, 0dB gain

-80

dB

(Note 8)

Channel Separation (Note 9)

1kHz input signal

100

dB

Digital to Analogue Converter (DAC) to Line-Out (LOUT1, ROUT1 with 10kΩ / 50pF load)

Full-scale output

PGA gains set to 0dB,

OUT34BOOST=0

AVDD/3.3

Vrms

PGA gains set to 0dB,

1.5x

OUT34BOOST=1

(AVDD/3.3)

Signal to Noise Ratio (Note 6,7)

SNR

A-weighted

TBD

98

dB

Total Harmonic Distortion

THD

RL = 10kΩ

-84

dB

(Note 8)

full-scale signal

Channel Separation (Note 9)

1kHz signal

80

100

dB

Output Mixers (LMX1, RMX1)

PGA gain range into mixer

-15

0

+6

dB

PGA gain step into mixer

3

dB

Analogue Outputs (LOUT1, ROUT1, LOUT2, ROUT2)

Programmable Gain range

-57

0

+6

dB

Programmable Gain step size

Monotonic

1

dB

Mute attenuation

1kHz, full scale signal

85

dB

Headphone Output (LOUT1, ROUT1 with 32Ω load)

0dB full scale output voltage

AVDD/3.3

Vrms

Signal to Noise Ratio

SNR

A-weighted

TBD

93

dB

Total Harmonic Distortion

THD

RL = 16Ω, Po=20mW

0.008

%

AVDD=3.3V

-81

dB

RL = 32 Ω, Po=20mW

0.007

%

AVDD=3.3V

- 83

dB

w

PP Rev 1.7 January 2005

7

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