WM8756

Advance Information

AI Rev 1.3 October 2001

6

Test Conditions

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SNR (Note 1,2,3)

Non ‘A’ weighted @ fs

= 48kHz

AVDD=DVDD=5V

103

dB

THD (Note 1,2,3)

1KHz, 0dBFs

-90

-95

dB

THD+N (Dynamic range, Note 2)

1kHz, -60dBFs

100

-106

dB

DAC channel separation

<95

dB

Analogue Output Levels

Load = 10k ohms,

0dBFS

1.1

Output level

Load = 10k ohms,

0dBFS,

(AVDD = 3.3V)

0.73

Gain mismatch

channel-to-channel

±1

%FSR

To midrail or a.c.

coupled

1kOhms

Minimum resistance load

To midrail or a.c.

coupled

(AVDD = 3.3V)

1kOhms

Maximum capacitance load

5V or 3.3V

100

pF

Output d.c. level

AVDD1-

AGND/2

V

Power On Reset (POR)

POR threshold

2.0

V

Table 3 AC Electrical Characteristics

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, 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.

3.

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