WM8738 Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

Número de pieza

componentes Descripción

Fabricante

WM8738

24 Bit Stereo ADC

Wolfson Microelectronics plc 

WM8738

Production Data

ELECTRICAL CHARACTERISTICS

Test Conditions

AVDD = 5.0V, AGND = 0V, DVDD = 3.3V, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.

PARAMETER

SYMBOL TEST CONDITIONS

MIN

TYP

MAX

UNIT

Digital Logic Levels (TTL Levels)

Input LOW level

VIL

Input HIGH level

VIH

0.8

V

2.0

V

Output LOW

Output HIGH

Pull down resistance (FMT,

NOHP)

VOL

IOL = 1mA

0.1 x DVDD

V

VOH

IOH = 1mA

0.9 x DVDD

V

RPD

100

kΩ

Analogue Reference Levels

Reference voltage

VCAP

AVDD/2 – AVDD/2 AVDD/2 +

V

50mV

50mV

Buffered reference voltage

Potential divider output

impedance

VREF

RCAP

VCAP

V

40

50

60

kΩ

Input to ADC

Input Signal Level (0dB)

VRIN / VLIN

1.0

Vrms

SNR (Note 1)

A-weighted, 0dB gain

90

dB

@ fs = 48KHz

SNR (Note 1)

A-weighted, 0dB gain

90

dB

@ fs = 96KHz

SNR (Note 1)

A-weighted, 0dB gain

90

dB

@ fs = 48KHz, AVDD =

3.3V

Dynamic Range (Note 2)

DNR

A-weighted, -60dB full

90

97

dB

scale input

Total Harmonic Distortion (THD)

-1dB input, 0dB gain

-87

dB

(Note 3)

ADC channel separation (Note

5)

1KHz input

95

dB

Power Supply Rejection Ratio

PSRR

1kHz 100mVp-p

50

dB

20Hz to 20kHz

45

dB

Input Resistance

100mVp-p

20

kΩ

Input Capacitance

10

pF

Notes

1. Ratio of output level with 1kHz full scale input, to the output level with the input open circuited, measured ‘A’ weighted

over a 20Hz to 20kHz bandwidth using an Audio analyser.

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. VREF and CAP de-coupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).

4. This data is measured, using an active filter on the device inputs.

w

PD Rev 4.4 August 2006

6

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