WM8948 查看數據表（PDF） - Wolfson Microelectronics plc

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WM8948

Stereo Low-Power CODEC with Video Buffer and Touch Panel Controller

Wolfson Microelectronics plc 

WM8948

ELECTRICAL CHARACTERISTICS

Test Conditions

DCVDD = 1.8V, DBVDD = LDOVDD = SPKVDD = 3.3V, LDOVOUT = 3.0V, GND = 0V,

TA = +25oC, 1kHz signal, fs = 48kHz, PGA gain = 0dB, 24-bit audio data unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

Analogue Inputs (IN1L, IN2L, IN1R, IN2R)

Maximum input signal

level (changes in

proportion to LDOVOUT)

Single-ended input

Pseudo-differential input

Input resistance (IN1L,

IN1R)

Input resistance (IN2L,

IN2R)

Input capacitance

+35.25dB gain

0dB gain

-12dB gain

All gain settings

MIN

TYP

1.0

0

0.7

-3.1

3.5

104

166

96

10

Analogue Inputs (AUX1, AUX2)

Maximum input signal

AUX1 or AUX2 enabled as audio

1.0

level (changes in

input

0

proportion to LDOVOUT)

Input resistance

Input mixer path (0dB)

100

Output mixer / direct speaker

15

path (0dB)

Output mixer / direct speaker

30

path (-6dB)

Input capacitance

10

Analogue Inputs Programmable Gain Amplifiers (PGAs)

Minimum programmable

gain

Maximum programmable

gain

Gain step size

Guaranteed monotonic

Mute attenuation

Common Mode

Rejection Ratio

1kHz input

-12

35.25

0.75

92

110

Speaker Output Programmable Gain Amplifiers (PGAs)

Minimum programmable

-57

gain

Maximum programmable

6

gain

Gain step size

Guaranteed monotonic

1

Mute attenuation

71

ADC Input Path Performance (Input PGAs to ADC)

SNR (A-weighted)

THD

-1dBFS input

THD+N

-1dBFS input

Channel separation

(Left/Right)

PSRR (with respect to

LDOVDD)

217Hz

1kHz

84

94

-83

-77

95

77

90

Production Data

MAX

UNIT

Vrms

dBV

Vrms

dBV

kΩ

kΩ

kΩ

kΩ

pF

Vrms

dBV

kΩ

kΩ

kΩ

pF

dB

dB

dB

dB

dB

dB

dB

dB

dB

dB

-75

dB

-70

dB

dB

dB

w

PD, May 2011, Rev 4.1

10

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