CS47L35 datasheet(12/300 Pages) CIRRUS

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DS1085F3

CS47L35

3 Characteristics and Specifications

Table 3-7. Digital Input Signal Level—DMICDAT1, DMICDAT2

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

Parameter

Minimum

Typical

Max

Units

Full-scale input signal level (0 dBFS output)

0 dB gain

—

–6

—

dBFS

Note: The DMIC input signal level is measured in dBFS, where 0 dBFS is a signal level equal to the full-scale range (FSR) of the PDM input.

The FSR is defined as the amplitude of a 1-kHz sine wave whose positive and negative peaks are represented by the maximum and

minimum digital codes respectively—this is the largest 1-kHz sine wave that can fit in the digital output range without clipping.

Table 3-8. Output Characteristics

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

Parameter

Minimum

Typical

Max

Units

Line/headphone/earpiece

output driver (HPOUTL,

HPOUTR)

Load resistance

Normal operation, Single-Ended Mode

Normal operation, Differential (BTL) Mode

Device survival with load applied indefinitely

—



Load capacitance

Single-Ended Mode

Differential (BTL) Mode

—

500

200

Earpiece output driver

(EPOUT)

Load resistance

Normal operation

Device survival with load applied

indefinitely

—



Load capacitance

—

200

Speaker output driver

(SPKOUTP+SPKOUTN)

Load resistance

Normal operation

Device survival with load applied

indefinitely

—



Load capacitance

—

200

Digital speaker output

(SPKDAT)

Full-scale output level 1

1.The digital output signal level is measured in dBFS, where 0 dBFS is a signal level equal to the full-scale range (FSR) of the PDM output.

The FSR is defined as the amplitude of a 1-kHz sine wave whose positive and negative peaks are represented by the maximum and

minimum digital codes respectively—this is the largest 1-kHz sine wave that can fit in the digital output range without clipping.

0 dBFS digital core output, 0 dB gain

—

–6

—

dBFS

Table 3-9. Input/Output Path Characteristics

Test conditions (unless specified otherwise): DBVDD1 = DBVDD2 = CPVDD1 = AVDD = 1.8 V, DCVDD = FLLVDD = CPVDD2 = 1.2 V; MICVDD = 2.5 V

(powered from internal LDO); SPKVDD = 4.2 V; TA = +25ºC; 1 kHz sinusoid signal; Fs = 48 kHz; PGA gain = 0 dB, 24-bit audio data.

Parameter

Min Typ Max Units

Line/headphone/earpiece output

driver (HPOUTL, HPOUTR)

DC offset at Load

Single-ended mode —

—

V

Differential (BTL) mode —

—

V

Earpiece output driver

(EPOUT+EPOUTN)

DC offset at Load

—

V

Speaker output driver

(SPKOUTP+SPKOUTN)

DC offset at Load

—

300

—

V

SPKVDD leakage current

—

A

Analog input paths (INnL, INnR)

to ADC (Differential Input Mode)

SNR (A-weighted), defined in Table 3-1

48 kHz sample rate

16 kHz sample rate (wideband voice)

—

101

105

—

THD, defined in Table 3-1

–1 dBV input —

–87

—

THD+N, defined in Table 3-1

–1 dBV input —

–86 –76

Channel separation (L/R), defined in Table 3-1

100 Hz to 10 kHz —

100

—

Input-referred noise floor

A-weighted, PGA gain = +20 dB —

3.2

—

VRMS

CMRR, defined in Table 3-1

PGA gain = +30 dB

PGA gain = 0 dB

—

PSRR (DBVDDn, CPVDD1, AVDD),

defined in Table 3-1

100 mV (peak-peak) 217 Hz

100 mV (peak-peak) 10 kHz

—

PSRR (DCVDD, FLLVDD, CPVDD2),

defined in Table 3-1

100 mV (peak-peak) 217 Hz

100 mV (peak-peak) 10 kHz

—

PSRR (SPKVDD), defined in Table 3-1

100 mV (peak-peak) 217 Hz

100 mV (peak-peak) 10 kHz

—

100

—

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