WM1824

Production Data

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PD, Rev 4.1, December 2011

6

ELECTRICAL CHARACTERISTICS

Test Conditions

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analogue Output Levels

Output Level

0dBFS

2.04

2.1×AVDD

3.3

¯¯¯¯¯¯¯¯

2.14

Vrms

Load Impedance

1

A

kΩ

Load Capacitance

No external RC filter

300

pF

With filter shown in

Figure 15

1

µF

DAC Performance

Signal to Noise Ratio

SNR

A-weighted

106

dB

Un-weighted

104

dB

Dynamic Range

DNR

A-weighted

104

dB

Total Harmonic Distortion

THD

-1dBFS

-89

dB

0dBFS

-86

dB

AVDD + LINEVDD

Power Supply Rejection Ratio

PSRR

100Hz

54

dB

1kHz

54

dB

20kHz

50

dB

Channel Separation

1kHz

100

dB

20Hz to 20kHz

95

dB

System Absolute Phase

0

degrees

Channel Level Matching

0.1

dB

Mute Attenuation

-120

dB

DC Offset at LINEVOUTL and

LINEVOUTR

-1

0

1

mV

Digital Logic Levels

Input HIGH Level

0.7



LINEVDD

V

Input LOW Level

0.3



LINEVDD

V

Input Capacitance

10

pF

Input Leakage

-0.9

0.9

A

Note:

1.

To prevent over-current protection shutdown of the device, ensure that the load impedance is never less than 100Ω. If

a load impedance of less than 100Ω is presented to either LINEVOUTL or LINEVOUTR, the device may go into a

protective shutdown state where the charge pump will stop running and the device will shut down. It will take a

hardware reset to come out of this state (recycle the power supplies or hold /MUTE low for 1024 LRCLK cycles after

the low impedance load condition has been removed).

TERMINOLOGY

1.

Signal-to-Noise Ratio (dB) – SNR is a measure of the difference in level between the maximum theoretical full scale

output signal and the output with no input signal applied.

2.

Total Harmonic Distortion (dB) – THD is the level of the rms value of the sum of harmonic distortion products relative to

the amplitude of the measured output signal.

3.

All performance measurements carried out with 20kHz low pass filter, and where noted an A-weighted filter. Failure to

use such a filter will result in higher THD and lower SNR 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.

4.

Mute Attenuation – This is a measure of the difference in level between the full scale output signal and the output with

mute applied.