WM8987LGECOSLASHRV datasheet(6/58 Pages) WOLFSON

6 / 58 page

WM8987L

Pre-Production

PP Rev 3.0 January 2007

ELECTRICAL CHARACTERISTICS

Test Conditions

DCVDD = 1.5V, DBVDD = 3.3V, AVDD = HPVDD = 3.3V, TA = +25

oC, 1kHz signal, fs = 48kHz, PGA gain = 0dB,

ADCOSR = DACOSR = 1 (64 fs), 24-bit audio data unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

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

AVDD = 3.3V

1.0

Full Scale Input Signal Level

(for ADC 0dB Input at 0dB Gain)

VINFS

AVDD = 1.8V

0.545

V rms

L/RINPUT1 to ADC,

PGA gain = 0dB

L/RINPUT1 to ADC,

PGA gain = +30dB

1.5

L/RINPUT1 unused

DC Measurement

Input Resistance

L/RINPUT1 unused

Ω

Input Capacitance

AVDD = 3.3V

Signal to Noise Ratio

(A-weighted)

SNR

AVDD = 1.8V

-1dBFs input,

AVDD = 3.3V

-80

0.01

Total Harmonic Distortion

THD

-1dBFs input,

AVDD = 1.8V

-70

0.03

ADC Channel Separation

1kHz signal

Channel Matching

1kHz signal

0.04

DAC to BTL headset drive (left=LOUT2/OUT3, right=ROUT1/ROUT2)

Full scale output voltage

across BTL load

0dBFS

LOUT2-OUT3,

ROUT1-ROUT2

AVDD/1.65

Vrms

Output Power per channel

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

AVDD=HPVDD=1.8V,

RL=32

Ω, PO=5mW

-66

0.05

-58

0.13

Total Harmonic Distortion

THD

AVDD=HPVDD =1.8V,

RL=16

Ω, PO=5mW

-62

0.08

Signal to Noise Ratio

(A-weighted)

SNR

AVDD=HPVDD =1.8V,

RL=32

Ω

DAC to single-ended headset drive (LOUT2/ROUT2, using capacitors)

Full scale output voltage

0dBFS

LOUT2, ROUT2

AVDD/3.3

Vrms

Output Power per channel

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

HPVDD=3.3V, RL=32

Ω,

PO=5mW

-61

0.09

-52

0.25

Total Harmonic Distortion

THD

HPVDD=3.3V, RL=16

Ω,

PO=5mW

-60

0.1

-52

0.25

Signal to Noise Ratio

(A-weighted)

SNR

AVDD=HPVDD =3.3V

DAC to single-ended headset drive (capless, using OUT3 as headphone ground)

Full scale output voltage

0dBFS

LOUT2-OUT3,

ROUT2-OUT3

AVDD/3.3

Vrms

Output Power per channel

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

HPVDD=3.3V, RL=32

Ω,

PO=5mW

-61

0.09

Total Harmonic Distortion

THD

HPVDD=3.3V, RL=16

Ω,

PO=5mW

-60

0.1

WM8987LGECO/RV Datasheet(PDF) 6 Page - Wolfson Microelectronics plc

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