PCM1820 datasheet(6/40 Pages) TI

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7.4 Thermal Information

THERMAL METRIC(1)

PCM182x

UNIT

RTE (WQFN)

20 PINS

RθJA -High

Junction-to-ambient thermal resistance

55.9

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

33.1

°C/W

RθJB

Junction-to-board thermal resistance

23.4

°C/W

ψJT

Junction-to-top characterization parameter

0.6

°C/W

ψJB

Junction-to-board characterization parameter

23.3

°C/W

RθJC(bot)

Junction-to-case (bottom) thermal resistance

16.7

°C/W

(1)

For more information about traditional and new thermal metrics, see the spra953 application report.

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 (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ADC CONFIGURATION

AC input impedance

(PCM1820)

Input pins INxP or INxM

2.5

kΩ

AC input impedance

(PCM1821)

kΩ

PCM1820: ADC PERFORMANCE FOR LINE/MICROPHONE INPUT RECORDING : AVDD 3.3-V OPERATION

Differential 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, DRE enabled (DRE_LVL = –

36 dB, DRE_MAXGAIN = 24 dB)

115

122

IN1 differential input selected and AC signal

shorted to ground, DRE disabled

106

112

Dynamic range, A-

weighted(2)

IN1 differential input selected and –60-dB full-

scale AC signal input, DRE enabled (DRE_LVL =

–36 dB, DRE_MAXGAIN = 24 dB)

123

IN1 differential input selected and –60-dB full-

scale AC signal input, DRE disabled

113

THD+N

Total harmonic

distortion(2) (3)

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

AC signal input, DRE enabled (DRE_LVL = –36

dB, DRE_MAXGAIN = 24 dB)

–98

–80

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

AC signal input, DRE disabled

–98

PCM1821: ADC PERFORMANCE FOR LINE/MICROPHONE INPUT RECORDING : AVDD 3.3-V OPERATION

Differential 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

TBD

106

Dynamic range, A-

weighted(1) (2)

IN1 differential input selected and –60-dB full-

scale AC signal input

106

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

AC signal input

–98

ADC OTHER PARAMETERS

Output data sample rate

7.35

192

kHz

PCM1820, PCM1821

SBASA61 – DECEMBER 2020

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