WM8972L Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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WM8972L

Mono CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

WM8972L

Preliminary Technical Data

ELECTRICAL CHARACTERISTICS

Test Conditions

DCVDD = 1.5V, DBVDD = 3.3V, AVDD = OPVDD = 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

Analogue Inputs (LINPUT1, RINPUT1, LINPUT2, RINPUT2, LINPUT3, RINPUT3) to ADC out

Full Scale Input Signal Level

(for ADC 0dB Input at 0dB Gain)

VINFS

AVDD = 3.3V

AVDD = 1.8V

1.0

0.545

V rms

Input Resistance

+/-INPUT1 to ADC,

22

kΩ

PGA gain = 0dB

+/-INPUT1 to ADC,

1.5

PGA gain = +30dB

DC Measurement

16

+/-INPUT1 unused

17

Input Capacitance

10

pF

Signal to Noise Ratio

SNR

AVDD = 3.3V

80

95

dB

(A-weighted)

AVDD = 1.8V

90

Dynamic Range

-60dBFs

90

95

dB

Total Harmonic Distortion

THD

-1dBFs input,

-82

-77

dB

AVDD = 3.3V

0.008

0.014

%

-1dBFs input,

-74

AVDD = 1.8V

0.02

Analogue Outputs (OUT+/-, MONOOUT)

0dB Full scale output voltage

AVDD/3.3

Vrms

Mute attenuation

1kHz, full scale signal

90

dB

MONOOUT pin

81

DAC to Line-Out (OUT+/- with 10kΩ / 50pF load)

Signal to Noise Ratio

SNR

AVDD=3.3V

90

98

dB

(A-weighted)

AVDD=1.8V

93

Total Harmonic Distortion

THD

AVDD=3.3V

-84

dB

AVDD=1.8V

-80

Speaker Output (OUT +/- with 8Ω bridge tied load, OUTINV=1)

Output Power

Total Harmonic Distortion

PO

THD

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

Po=180mW, RL=8Ω,

-60

dB

OPVDD=3.3V

0.1

%

Po=400mW, RL=8Ω

-36

OPVDD=3.3V

1.6

Signal to Noise Ratio

SNR

OPVDD=3.3V, RL=8Ω

95

dB

(A-weighted)

Analogue Reference Levels

Midrail Reference Voltage

VMID

–3%

AVDD/2

+3%

V

Buffered Reference Voltage

VREF

–3%

AVDD/2

+3%

V

Microphone Bias

Bias Voltage

Bias Current Source

Output Noise Voltage

VMICBIAS

IMICBIAS

Vn

3mA load current

1K to 20kHz

–5%

0.9×AVDD

15

+ 5%

3

V

mA

nV/√Hz

Digital Input / Output

Input HIGH Level

Input LOW Level

Output HIGH Level

Output LOW Level

VIH

0.7×DBVDD

VIL

VOH

IOL=1mA

0.9×DBVDD

VOL

IOH-1mA

V

0.3×DBVDD

V

V

0.1×DBVDD

V

w

PTD Rev 2.2 June 2004

6

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