XWM8731EDS データシートの表示（PDF） - Wolfson Microelectronics plc

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XWM8731EDS

Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates

Wolfson Microelectronics plc 

WM8731

Advanced Information

ELECTRICAL CHARACTERISTICS

Test Conditions

AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, XTI/MCLK =

256fs unless otherwise stated.

PARAMETER

SYMBOL

TEST

MIN

TYP

MAX

UNIT

CONDITIONS

Digital Logic Levels (CMOS Levels)

Input LOW level

VIL

.3 x DBVDD

V

Input HIGH level

VIH

.7 x DBVDD

V

Output LOW

VOL

0.10 x

V

DBVDD

Output HIGH

VOH

.9 x DBVDD

V

Power On Reset Threshold (DCVDD)

DCVDD Threshold On -> Off

Vth

0.7

0.9

1.2

V

Hysteresis

VIH

0.3

V

DCVDD Threshold Off -> On

VOL

Analogue Reference Levels

0.6

V

Reference voltage (VMID)

VVMID

AVDD/2 – AVDD/2 AVDD/2 +

V

50mV

50mV

Potential divider resistance

RVMID

40k

50k

60k

Ohms

Line Input to ADC

Input Signal Level (0dB)

VINLINE

1.0

AVDD/3.3

Vrms

SNR (Note 1,3)

A-weighted, 0dB gain

93

97

dB

@ fs = 48kHz

SNR (Note 1,3)

A-weighted, 0dB gain

94

dB

@ fs = 96kHz

SNR (Note 1,3)

A-weighted, 0dB gain

90

dB

@ fs = 48kHz, AVDD =

2.7V

Dynamic Range (Note 3)

DR

A-weighted, -60dB full

93

97

dB

scale input

THD

-1dB input, 0dB gain

-85

-80

dB

Power Supply Rejection Ratio

PSSR

1kHz 100mVpp

50

dB

20Hz to 20kHz

45

dB

100mVpp

ADC channel separation

1kHz input

90

dB

Programmable Gain Maximum

1kHz input

+12

dB

Programmable Gain Minimum

Rsource < 50 Ohms

-34.5

Programmable Gain Step Size

Guaranteed Monotonic

1.5

dB

Mute attenuation

0dB, 1kHz input

80

dB

Input Resistance

RINLINE

0dB gain

40k

50k

Ohms

12dB gain

10k

20k

Ohms

Input Capacitance

CINLINE

10

pF

Microphone Input to ADC @ 0dB Gain, fs = 8kHz (40k ohm Source Impedance. See Figure 11)

Input Signal Level (0dB)

VINMIC

1.0

AVDD/3.3

Vrms

SNR (Note 1,3)

A-weighted, 0dB gain

85

90

dB

Dynamic Range (Note 3)

DR

A-weighted, -60dB full

85

90

dB

scale input

THD

0dB input, 0dB gain

-80

-75

dB

Power Supply Rejection Ratio

PSSR

1kHz 100mVpp

50

dB

20Hz to 20kHz

45

dB

100mVpp

WOLFSON MICROELECTRONICS LTD

AI Rev 2.0 February 2001

8

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