Quad ADC with Diagnostics Data Sheet ADAU1977 FEATURES GENERAL DESCRIPTION Programmable microphone bias (5 V to 9 V) with diagnostics The ADAU1977 incorporates four high performance analog-to- Four 10 V rms capable direct-coupled differential inputs digital converters (ADCs) with direct-coupled inputs capable of On-chip PLL for master clock 10 V rms. The ADC uses multibit sigma-delta (-) architecture Low EMI design with continuous time front end for low EMI. The ADCs can be 109 dB ADC dynamic range connected to the electret microphone (ECM) directly and pro- 95 dB THD + N vide the bias for powering the microphone. Built-in diagnostic Selectable digital high-pass filter circuitry detects faults on input lines and includes comprehensive 24-bit ADC with 8 kHz to 192 kHz sample rates diagnostics for faults on microphone inputs. The faults reported Digital volume control with autoramp function are short to battery, short to microphone bias, short to ground, 2 I C/SPI control short between positive and negative input pins, and open input Software-controllable clickless mute terminals. In addition, each diagnostic fault is available as an 2 Software power-down IRQ flag for ease in system design. An I C/SPI control port is 2 Right justified, left justified, I S justified, and TDM modes also included. The ADAU1977 uses only a single 3.3 V supply. Master and slave operation modes The part internally generates the microphone bias voltage. The 40-lead LFCSP package microphone bias is programmable in a few steps from 5 V to 9 V. Qualified for automotive applications The low power architecture reduces the power consumption. An on-chip PLL can derive the master clock from an external APPLICATIONS clock input or frame clock (sample rate clock). When fed with Automotive audio systems a frame clock, the PLL eliminates the need for a separate high Active noise cancellation system frequency master clock in the system. The ADAU1977 is available in a 40-lead LFCSP package. FUNCTIONAL BLOCK DIAGRAM ADAU1977 5V TO 9V BOOST 3.3V TO 1.8V MICBIAS CONVERTER DVDD REGULATOR I 50mA OUT MB GND PROG PGND BIAS AIN1P ADC IOVDD AIN1N AIN2P LRCLK ADC AIN2N BCLK AIN3P ADC SDATAOUT1 AIN3N AIN4P ADC SDATAOUT2 AIN4N AGND1 AGND3 VBAT SCL/CCLK AVDDx AVDD2 SDA/COUT I2C/SPI ADDR1/CIN BG PLL CONTROL DIAGNOSTICS REF ADDR0/CLATCH FAULT PD/RST AGND2 AGND2 AGNDx Figure 1. Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. 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PGND AGND1 AGND2 VBOOST IN AGND3 DGND VBOOST OUT ATTENUATOR 14dB SW VREF AVDD1 MCLKIN VBAT AVDD3 AVDD1 AVDD3 PLL FILT AVDD2 PROGRAMMABLE GAIN SA MODE DECIMATOR/HPF DC CALIBRATION SERIAL AUDIO PORT 10296-001ADAU1977 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Register Details ............................................................................... 37 Applications ....................................................................................... 1 Master Power and Soft Reset Register ..................................... 37 General Description ......................................................................... 1 PLL Control Register ................................................................. 38 Functional Block Diagram .............................................................. 1 DC-to-DC Boost Converter Control Register ....................... 39 Revision History ............................................................................... 3 MICBIAS and Boost Control Register .................................... 40 Specifications ..................................................................................... 4 Block Power Control and Serial Port Control Register ......... 41 Analog Performance Specifications ........................................... 4 Serial Port Control Register1 .................................................... 42 Diagnostic and Fault Specifications ........................................... 5 Serial Port Control Register2 .................................................... 43 Digital Input/Output Specifications........................................... 6 Channel Mapping for Output Serial Ports Register ............... 44 Power Supply Specifications........................................................ 6 Channel Mapping for Output Serial Ports Register ............... 46 Digital Filters Specifications ....................................................... 7 Serial Output Drive and Overtemperature Protection Control Register ......................................................................... 48 Timing Specifications .................................................................. 8 Post ADC Gain Channel 1 Control Register .......................... 49 Absolute Maximum Ratings .......................................................... 10 Post ADC Gain Channel 2 Control Register .......................... 50 Thermal Resistance .................................................................... 10 Post ADC Gain Channel 3 Control Register .......................... 51 ESD Caution ................................................................................ 10 Post ADC Gain Channel 4 Control Register .......................... 52 Pin Configuration and Function Descriptions ........................... 11 High-Pass Filter and DC Offset Control Register and Typical Performance Characteristics ........................................... 13 Master Mute ................................................................................ 53 Theory of Operation ...................................................................... 15 Diagnostics Control Register .................................................... 54 Overview ...................................................................................... 15 Diagnostics Report Register Channel 1 .................................. 55 Power Supply and Voltage Reference ....................................... 15 Diagnostics Report Register Channel 2 .................................. 56 Power-On Reset Sequence ........................................................ 15 Diagnostics Report Register Channel 3 .................................. 57 PLL and Clock ............................................................................. 16 Diagnostics Report Register Channel 4 .................................. 58 DC-to-DC Boost Converter ...................................................... 17 Diagnostics Interrupt Pin Control Register 1 ......................... 59 Microphone Bias ......................................................................... 18 Diagnostics Interrupt Pin Control Register 2 ......................... 60 Analog Inputs .............................................................................. 18 Diagnostics Adjustments Register 1 ........................................ 61 ADC ............................................................................................. 22 Diagnostics Adjustments Register 2 ........................................ 62 ADC Summing Modes .............................................................. 22 ADC Clipping Status Register .................................................. 63 Diagnostics .................................................................................. 23 Digital DC High-Pass Filter and Calibration Register .......... 64 Serial Audio Data Output PortsData Format ..................... 25 Applications Circuit ....................................................................... 65 Control Ports ................................................................................... 30 Outline Dimensions ....................................................................... 66 2 I C Mode ...................................................................................... 31 Ordering Guide .......................................................................... 66 SPI Mode ..................................................................................... 34 Automotive Products ................................................................. 66 Register Summary .......................................................................... 36 Rev. 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