ADAU1977WBCPZ-R7 datasheet(63/64 Pages) AD

63 / 64 page

Data Sheet

ADAU1977

Rev. A | Page 63 of 64

APPLICATIONS CIRCUIT

Figure 46. Typical Application Schematic—Two Microphones, Two Line Inputs, I2C and I2S Mode

I2C/SPI

CONTROL

MIC1

VAC = 2V DIFF

10µF ELECTROLYTIC

1nF MAX MLCC

C18

10µF

C19

0.1µF

C20

C21

R17

+3.3V (AVDD2)

C10

10µF

MLCC X7R

10µF

MLCC X7R

C11

0.1µF

C12

0.1µF

+3.3V

C13

0.1µF

C14

0.1µF

C15

0.1µF

REXT

0.1µF

C16

10µF

MLCC X7R

C1 TO C8 = 1000pF

R1 TO R4 TYP

= 500Ω ±0.1%

R17

C20

C21

4.87kΩ

2200pF

39nF

PLL INPUT OPTION

LRCLK

MCLK

1kΩ

390pF

5600pF

NOTES

1. R9, R10, R15 = TYPICAL

2kΩ FOR IOVDD = 3.3V, 1kΩ FOR 1.8V.

2. R11 THROUGH R14 USED FOR SETTING THE DEVICE IN I 2C MODE.

3. R16 = TYPICAL

47kΩ FOR IOVDD = 3.3V, 22kΩ FOR 1.8V.

4. PLL LOOP FILTER:

5. FOR MORE INFORMATION ABOUT CALCUL ATING THE VALUE OF REXT, SEE THE POWER-ON RESET SEQUENCE SECTION.

AIN1+

MICBIAS

DVDD

IOVDD

LRCLK

BCLK

SDATAOUT1

TO DSP

IOVDD

SDATAOUT2

SCL/CCLK

SDA/COUT

ADDR1/CIN

ADDR0/CL ATCH

FAULT

PD/RESET

+1.8V OR +3.3V

MB_GND

VBAT

AVDDx

AGND1

AGND3

AVDD2

PGND

ADC

BOOST

CONVERTER

IOUT 50mA

3.3V TO 1.8V

REGULATOR

ADC

AGND2

AGNDx

AGND2

C1 C2 C3 C4 C5 C6 C7 C8

R13

R14

AIN1–

AIN2+

AIN2–

AIN3+

AIN3–

DIAGNOSTICS

AIN4+

AIN4–

MIC2

VAC = 2V DIFF

LINE1

VCM = 7V, VAC = 10V DIFF

LINE2

VCM = 7V, VAC = 10V DIFF

MICRO-

CONTROLLER

5V TO 9V

PROG

BIAS

ADAU1977

REF

PLL

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