WM8580 datasheet(10/92 Pages) WOLFSON

10 / 92 page

WM8580

Production Data

PD Rev 4.0 February 2007

Test Conditions

AVDD, PVDD, VREFP = 5V, DVDD = 3.3V, AGND, VREFN = 0V, PGND, DGND = 0V, TA = +25

oC, 1kHz Signal, fs = 48kHz,

24-Bit Data, Slave Mode, MCLK, ADCMCLK = 256fs, 1Vrms Input Signal Level unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analogue Reference Levels

Reference voltage

VVMID

VREFP/2 –

50mV

VREFP/2

VREFP/2 +

50mV

VREFP to VMID and

VMID to VREFN

VMIDSEL = 1

kΩ

Potential divider resistance

RVMID

VREFP to VMID and

VMID to VREFN

VMIDSEL = 0

100

kΩ

S/PDIF Transceiver Performance

Jitter on recovered clock

S/PDIF Input Levels CMOS MODE

Input LOW level

VIL

0.3 X DVDD

Input HIGH level

VIH

0.7 X DVDD

Input capacitance

1.25

Input Frequency

MHz

S/PDIF Input Levels Comparator MODE

Input capacitance

1.31

Input resistance

kΩ

Input frequency

MHz

Input Amplitude

200

0.5 X DVDD

PLL

Period Jitter

ps(rms)

XTAL

Input XTI LOW level

VXIL

557

Input XTI HIGH level

VXIH

853

Input XTI capacitance

CXJ

3.32

4.491

Input XTI leakage

IXleak

28.92

38.96

Output XTO LOW

VXOL

15pF load capacitors

278

Output XTO HIGH

VXOH

15pF load capacitors

1.458

1.942

Supply Current

Analogue supply current

AVDD, VREFP = 5V

Analogue supply current

AVDD, VREFP = 3.3V

Digital supply current

DVDD = 3.3V

Power Down

Notes:

Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’

weighted.

All performance measurements done with 20kHz low pass filter, and where noted an A-weight filter. Failure to use

such a filter will result in higher THD+N and lower SNR and Dynamic Range readings than are found in the Electrical

Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect dynamic

specification values.

VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).

TERMINOLOGY

Signal-to-noise ratio (dB) - SNR is a measure of the difference in level between the full scale output and the output

with no signal applied. (No Auto-zero or Automute function is employed in achieving these results).

Dynamic range (dB) - DNR is a measure of the difference between the highest and lowest portions of a signal.

Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB

to it. (e.g. THD+N @ -60dB= -32dB, DR= 92dB).

THD (dB) - THD is a ratio, of the rms values, of Distortion/Signal.

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