WM8281ECSSLASHR datasheet(16/392 Pages) CIRRUS

16 / 392 page

WM8281

Rev 4.0

ELECTRICAL CHARACTERISTICS

Test Conditions

AVDD = 1.8V,

With the exception of the condition(s) noted above, the following electrical characteristics are valid across the full range of

recommended operating conditions.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analogue Input Signal Level (IN1L, IN1R, IN2L, IN2R, IN3L, IN3R)

Full-scale input signal level

(0dBFS output)

VINFS

Single-ended PGA input,

0dB PGA gain

0.5

-6

VRMS

dBV

Differential PGA input,

0dB PGA gain

VRMS

dBV

Notes:

1. The full-scale input signal level is also the maximum analogue input level, before clipping occurs.

2. The full-scale input signal level changes in proportion with AVDD. For differential input, it is calculated as AVDD / 1.8.

3. A 1.0VRMS differential signal equates to 0.5VRMS/-6dBV per input.

4. A sinusoidal input signal is assumed.

Test Conditions

TA = +25ºC

With the exception of the condition(s) noted above, the following electrical characteristics are valid across the full range of

recommended operating conditions.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analogue Input Pin Characteristics (IN1L, IN1R, IN2L, IN2R, IN3L, IN3R)

Input resistance

RIN

Single-ended PGA input,

All PGA gain settings



Differential PGA input,

All PGA gain settings

Input capacitance

CIN

Test Conditions

The following electrical characteristics are valid across the full range of recommended operating conditions.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input Programmable Gain Amplifiers (PGAs)

Minimum programmable gain

Maximum programmable gain

Programmable gain step size

Guaranteed monotonic

Test Conditions

The following electrical characteristics are valid across the full range of recommended operating conditions.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Digital Microphone Input Signal Level (DMICDAT1, DMICDAT2, DMICDAT3, DMICDAT4)

Full-scale input signal level

(0dBFS output)

0dB gain

-6

dBFS

Notes:

5. The digital microphone input signal level is measured in dBFS, where 0dBFS is a signal level equal to the full-scale range (FSR)

of the PDM input. The FSR is defined as the amplitude of a 1kHz sine wave whose positive and negative peaks are represented

by the maximum and minimum digital codes respectively - this is the largest 1kHz sine wave that will fit in the digital output range

without clipping. Note that, because the definition of FSR is based on a sine wave, the PDM data format can support signals

larger than 0dBFS.

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