WM8950GEFL/V Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

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WM8950GEFL/V

ADC with Microphone Input and Programmable Digital Filters

Wolfson Microelectronics plc 

WM8950

Preliminary Technical Data

ELECTRICAL CHARACTERISTICS

Test Conditions

DCVDD = 1.8V, AVDD = DBVDD = 3.3V, SPKVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless

otherwise stated.

PARAMETER

SYMBOL TEST CONDITIONS

Microphone Inputs (MICN, MICP)

Full-scale Input Signal Level

(Note 1) – note this changes with

AVDD

VINFS

PGABOOST = 0dB

INPPGAVOL = 0dB

Mic PGA equivalent input noise

At 35.25dB

gain

Input resistance

RMICIN

Gain set to 35.25dB

Input resistance

RMICIN

Gain set to 0dB

Input resistance

RMICIN

Gain set to -12dB

Input resistance

RMICIP

MICP2INPPGA = 1

Input resistance

RMICIP

MICP2INPPGA = 0

Input Capacitance

CMICIN

Recommended coupling cap

CCOUP

MIC Input Programmable Gain Amplifier (PGA)

Programmable Gain

Programmable Gain Step Size

Guaranteed monotonic

Mute Attenuation

Selectable Input Gain Boost (0/+20dB)

Gain Boost

Automatic Level Control (ALC)/Limiter

Target Record Level

Programmable Gain

Programmable Gain Step Size

Guaranteed Monotonic

Gain Hold Time (Note 2)

tHOLD

MCLK=12.288MHz

(Note 4)

Gain Ramp-Up (Decay) Time

tDCY

(Note 3)

Gain Ramp-Down (Attack) Time

tATK

(Note 3)

Mute Attenuation

Analogue to Digital Converter (ADC)

Signal to Noise Ratio (Note 5, 6)

Total Harmonic Distortion

(Note 6)

Auxiliary Analogue Input (AUX)

Full-scale Input Signal Level (0dB)

– note this changes with AVDD

VINFS

ALCMODE=0 (ALC),

MCLK=12.288MHz

(Note 4)

ALCMODE=1 (limiter),

MCLK=12.288MHz

(Note 4)

ALCMODE=0 (ALC),

MCLK=12.288MHz

(Note 4)

ALCMODE=1 (limiter),

MCLK=12.288MHz

(Note 4)

A-weighted, 0dB gain

full-scale, -1dB

Input Resistance

Input Capacitance

RAUXIN

CAUXIN

AUXMODE=0

MIN

TYP

MAX

1.0

0

TBD

1.6

47

75

94

TBD

10

220

-12

35.25

0.75

TBD

0

20

-28.5

-6

-12

35.25

0.75

0, 2.67, 5.33, 10.67, … , 43691

(time doubles with each step)

3.3, 6.6, 13.1, … , 3360

(time doubles with each step)

0.73, 1.45, 2.91, … , 744

(time doubles with each step)

0.83, 1.66, 3.33, … , 852

(time doubles with each step)

0.18, 0.36, 0.73, … , 186

(time doubles with each step)

TBD

95

-85

1.0

0

20

10

UNIT

Vrms

dBV

uV

kΩ

kΩ

kΩ

kΩ

kΩ

pF

pF

dB

dB

dB

dB

dB

dB

dB

ms

ms

ms

dB

dB

dB

Vrms

dBV

kΩ

pF

w

PTD Rev 2.1 June 2005

6

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