WM8777 Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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WM8777

24-bit, 192kHz AV Receiver on-a-Chip

Wolfson Microelectronics plc 

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WM8777

Test Conditions

AVDDDAC = 5V, AVDDADC=5V, DVDD = 3.3V, AGNDDAC = 0V, AGNDADC = 0, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK

= 256fs, ADC/DAC in Slave Mode unless otherwise stated.

PARAMETER

SYMBOL TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analogue Bass Management and Tone Controls

Treble range adjustment

-10

+10

dB

Treble step size

1

dB

Bass range adjustment

-10

+10

dB

Bass step size

Headphone Amplifier at 0dB Volume (Load=16 Ω, at 1Vrms)

1

dB

Headphone output level

1.5

Vrms

THD

-74

dB

SNR

Headphone Amplifier at 0dB Volume (Load=32 Ω, at 1Vrms)

-96

dB

Headphone output level

0.95

Vrms

THD

-68

dB

SNR

-100

dB

S/PDIF Transceiver

Jitter on recovered clock (Rms

period jitter)

50

Ps

S/PDIF Input Levels CMOS MODE

Input LOW level

VIL

Input HIGH level

VIH

0.7 X DVDD

0.3 X DVDD

V

V

Input capacitance

1.25

pF

Input Frequency

36

MHz

S/PDIF Input Levels Comparator MODE

Input capacitance

Input resistance

1.31

pF

18

Ω

Input frequency

25

MHz

Input Amplitude

200

0.5 X DVDD

mV

PLL

Period Jiffer

80

ps(rms)

XTAL

Input XTI LOW level

Input XTI HIGH level

Input XTI capacitance

Input XTI leakage

Output XTO LOW

VXIL

VXIH

CXJ

IXleak

VXOL

15pF load capacitors

0

853

3.32

28.92

86

557

mV

mV

4.491

pF

38.96

mA

278

mV

Output XTO HIGH

VXOH

15pF load capacitors

1.458

1.942

V

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.

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

w

PP Rev 1.94 November 2004

9

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