WM8740

Production Data

w

PD, Rev 4.4, April 2010

7

Test Conditions

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analogue Output Levels

Output level differential

Into 10k

Ω, full scale 0dB,

(5V supply)

2

Into 10k

Ω, full scale 0dB,

(3.3V supply)

1.32

Minimum resistance load

To midrail or AC coupled

(5V supply)

1

k

Ω

To midrail or AC coupled

(3.3V supply)

600

Ω

Maximum capacitance load

5V or 3.3V

100

pF

Output DC level

AVDD/2

V

Reference Levels

Potential divider resistance

AVDD to VMIDL/VMIDR and

VMIDL/VMIDR to AGND

10

k

Ω

Voltage at VMIDL/VMIDR

AVDD/2

Notes: 1.

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

weighted over a 20Hz to 20kHz bandwidth.

2.

All performance measurements done with 20kHz low pass 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.

BCKIN

DIN

LRCIN

t

BCH

t

BCL

t

BL

t

LB

t

BCY

t

DS

t

DH

Figure 1 Audio Data Input Timing

Test Conditions

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Audio Data Input Timing Information

BCKIN pulse cycle time

100

ns

BCKIN pulse width high

40

ns

BCKIN pulse width low

40

ns

BCKIN rising edge to

LRCIN edge

20

ns

LRCIN rising edge to

BCKIN rising edge

20

ns

DIN setup time

20

ns

DIN hold time

20

ns