WM8739 / WM8739L

Advanced Information

AI Rev 2.2 September 2001

6

TERMINOLOGY

1.

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

a zero signal applied. (No ‘Auto-zero’ or Automute function is employed in achieving these results).

2.

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).

3.

THD+N (dB) - THD+N is a ratio, of the r.m.s. values, of (Noise + Distortion)/Signal.

4.

Channel Separation (dB) - Also known as Cross-Talk. This is a measure of the amount one channel is isolated from

the other. Normally measured by sending a full scale signal down one channel and measuring the other.

POWER CONSUMPTION

TYP. SUPPLY CURRENTS

(MILLIAMPS)

MODE

DESCRIPTION

POWER

(mW)

WM8739 (AVDD = 3.3V, DBVDD = 3.3V, DCVDD = 1.5V)

ADC Running

0

0

0

0

9.79

1.58

2.40

41.12

Standby

0

0

1

1

0.014

1.56

0.074

5.31

Power Down

1

0

X

X

0.001

1.57

0.074

5.30

Power Down,

Oscillator disabled

1

1

X

X

0.001

0.003

0.056

0.097

WM8739L (AVDD = 1.8V, DBVDD = 1.8V, DCVDD = 1.42V)

ADC Running

0

0

0

0

3.93

0.875

2.35

11.99

Standby

0

0

1

1

0.007

0.755

0.018

1.397

Power Down

1

0

X

X

0.001

0.755

0.018

1.386

Power Down,

Oscillator disabled

1

1

X

X

0.001

<1

µA<1µA

0.002

Table 1 Powerdown Mode Current Consumption Examples

Notes

1.

2.

All figures are quiescent, with no signal.