PCM1820 datasheet(7/120 Pages) TI

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7.5 Electrical Characteristics

at TA = 25°C, AVDD = 3.3 V, IOVDD = 3.3 V, fIN = 1-kHz sinusoidal signal, fS = 48 kHz, 32-bit audio data, BCLK = 256 × fS,

TDM slave mode, and PLL on (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ADC CONFIGURATION

AC input impedance

Input pins INxP or INxM, 2.5-kΩ input impedance

selection

2.5

kΩ

Input pins INxP or INxM, 10-kΩ input impedance

selection

Input pins INxP or INxM, 20-kΩ input impednace

selection

Channel gain range

Programmable range with 0.5-dB steps

ADC PERFORMANCE FOR LINE/MICROPHONE INPUT RECORDING : AVDD 3.3-V OPERATION

Differential input full-scale

AC signal voltage

AC-coupled input

VRMS

Single-ended input full-

scale AC signal voltage

AC-coupled input

VRMS

SNR

Signal-to-noise ratio, A-

weighted(1) (2)

IN1 differential input selected and AC signal shorted to

ground, 10-kΩ input impedance selection, 0-dB channel

gain

100

106

IN1 differential input selected and AC signal shorted to

ground, 10-kΩ input impedance selection, 12-dB channel

gain

100

Dynamic range, A-

weighted(2)

IN1 differential input selected and –60-dB full-scale AC

signal input, 10-kΩ input impedance selection, 0-dB

channel gain

107

IN1 differential input selected and –72-dB full-scale AC

signal input, 10-kΩ input impedance selection, 12-dB

channel gain

100

THD+N

Total harmonic distortion(2)

(3)

IN1 differential input selected and –1-dB full-scale AC

signal input, 10-kΩ input impedance selection, 0-dB

channel gain

–95

–80

IN1 differential input selected and –13-dB full-scale AC

signal input, 10-kΩ input impedance selection, 12-dB

channel gain

–93

ADC PERFORMANCE FOR LINE/MICROPHONE INPUT RECORDING : AVDD 1.8-V OPERATION

Differential input full-scale

AC signal voltage

AC-coupled Input

VRMS

Single-ended input full-

scale AC signal voltage

AC-coupled Input

0.5

VRMS

SNR

Signal-to-noise ratio, A-

weighted(1) (2)

IN1 differential input selected and AC signal shorted to

ground, 10-kΩ input impedance selection, 0-dB channel

gain

100

Dynamic range, A-

weighted(2)

IN1 differential input selected and –60-dB full-scale AC

signal input, 10-kΩ input impedance selection, 0-dB

channel gain

101

THD+N

Total harmonic distortion(2)

(3)

IN1 differential input selected and –2-dB full-scale AC

signal Input, 10-kΩ input impedance selection, 0 dB

channel gain

–90

ADC OTHER PARAMETERS

Digital volume control

range

Programmable 0.5-dB steps

–100

Output data sample rate

Programmable

7.35

768

kHz

Output data sample word

length

Programmable

Bits

Digital high-pass filter cutoff

frequency

First-order IIR filter with programmable coefficients,

–3-dB point (default setting)

Interchannel isolation

–1-dB full-scale AC-signal input to non measurement

channel

–124

Interchannel gain mismatch –6-dB full-scale AC-signal input and 0-dB channel gain

0.1

Gain drift(4)

0-dB channel gain, across temperature range –40°C to

125°C

36.8

ppm/°C

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TLV320ADC3120

SBASA91A – DECEMBER 2020 – REVISED JUNE 2021

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