WM8737L

Preliminary Technical Data

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AI Rev 3.0 May 2004

6

ELECTRICAL CHARACTERISTICS

Test Conditions

24-bit audio data, unless otherwise stated. Microphone preamplifier at maximum bias (default) and gain 13dB, unless otherwise

stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Microphone Preamplifier (LINPUT1/2/3, RINPUT1/2/3) to ADC

MICBOOST = 00

13

MICBOOST = 01

18

MICBOOST = 10

28

Microphone Pre-amp (Boost)

Gain

MICBOOST = 11

33

dB

Voltage at 1kHz

Micboost gain = 28dB

6

nV /

√Hz

Microphone preamplifier noise

(referred to input)

(A-weighted)

at 20Hz – 20kHz

Micboost gain = 28dB

0.7

-123

µV rms

dBV

Input Offset Voltage

1

5

mV

AVDD = 3.3V

600

109

AVDD=1.8V

600

102

Microphone preamplifier Signal

to Noise Ratio

(A-weighted)

(Note 1)

SNR

28 dB gain,

AVDD = 3.3V

600

94

dB

Dynamic Range (Note 2)

DNR

A-weighted, -60dBFS

Gain = 0dB

94

dB

13dB gain,

AVDD = 3.3V, Single

Channel

-74

0.0056

Total Harmonic Distortion

(Note 3)

THD

13dB gain,

AVDD=1.8V, Single

Channel

-73

0.02

dB

%

Channel Separation

-65

dB

Power Supply Rejection Ratio

PSRR

1kHz, 100mV pk-pk,

60

dB

Input Leakage

Microphone

preamplifier enabled

-10

1

10

µA

Input Resistance

Ω

500k

Ω