Quad ADC with Diagnostics
Data Sheet
ADAU1977
FEATURES
GENERAL DESCRIPTION
Programmable microphone bias (5 V to 9 V) with diagnostics
Four 10 V rms capable direct-coupled differential inputs
On-chip PLL for master clock
Low EMI design
106 dB ADC dynamic range
The ADAU1977 incorporates four high performance analog-to-
digital converters (ADCs) with direct-coupled inputs capable of
10 V rms. The ADC uses multibit sigma-delta (Σ-Δ) architecture
with continuous time front end for low EMI. The ADCs can be
connected to the electret microphone (ECM) directly and pro-
vide the bias for powering the microphone. Built-in diagnostic
circuitry detects faults on input lines and includes comprehensive
diagnostics for faults on microphone inputs. The faults reported
are short to battery, short to microphone bias, short to ground,
short between positive and negative input pins, and open input
terminals. In addition, each diagnostic fault is available as an
IRQ flag for ease in system design. An I2C/SPI control port is
also included. The ADAU1977 uses only a single 3.3 V supply.
The part internally generates the microphone bias voltage. The
microphone bias is programmable in a few steps from 5 V to 9 V.
The low power architecture reduces the power consumption.
An on-chip PLL can derive the master clock from an external
clock input or frame clock (sample rate clock). When fed with
a frame clock, the PLL eliminates the need for a separate high
frequency master clock in the system. The ADAU1977 is
available in a 40-lead LFCSP package.
−95 dB THD + N
Selectable digital high-pass filter
24-bit ADC with 8 kHz to 192 kHz sample rates
Digital volume control with autoramp function
I2C/SPI control
Software-controllable clickless mute
Software power-down
Right justified, left justified, I2S justified, and TDM modes
Master and slave operation modes
40-lead LFCSP package
Qualified for automotive applications
APPLICATIONS
Automotive audio systems
Active noise cancellation system
FUNCTIONAL BLOCK DIAGRAM
ADAU1977
5V TO 9V
BOOST
3.3V TO 1.8V
REGULATOR
CONVERTER
MICBIAS
MB_GND
DVDD
I
50mA
OUT
PROG
BIAS
PGND
AIN1P
AIN1N
AIN2P
AIN2N
AIN3P
AIN3N
AIN4P
AIN4N
IOVDD
ADC
ADC
LRCLK
BCLK
ADC
ADC
SDATAOUT1
SDATAOUT2
AGND1
AVDD2
AGND3
PLL
VBAT
SCL/CCLK
SDA/COUT
ADDR1/CIN
ADDR0/CLATCH
FAULT
AVDDx
I2C/SPI
CONTROL
BG
REF
DIAGNOSTICS
PD/RST
AGND2
AGND2
AGNDx
Figure 1.
Rev. A
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