ADAU1761BCPZ IC

Technical Specifications of ADAU1761BCPZ

Datasheet	ADAU1761BCPZ datasheet
Category	Integrated Circuits (ICs)
Family	Interface – CODECs
Manufacturer	Analog Devices Inc.
Series	SigmaDSP?
Packaging	Tray
Part Status	Active
Type	Audio
Data Interface	Serial
Resolution (Bits)	24 b
Number of ADCs / DACs	2 / 2
Sigma Delta	Yes
S/N Ratio, ADCs / DACs (db) Typ	–
Dynamic Range, ADCs / DACs (db) Typ	–
Voltage – Supply, Analog	1.8 V ~ 3.65 V
Voltage – Supply, Digital	1.63V ~ 3.65V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	32-VFQFN Exposed Pad, CSP
Supplier Device Package	32-LFCSP-VQ (5×5)

ADAU1761BCPZ General Description

The ADAU1761 is an integrated digital audio processing low-power stereo audio codec that offers stereo 48 kHz recording and playback at 14 mW from a 1.8 V analog source. Sample speeds of 8 kHz to 96 kHz and a digital volume control are supported by the stereo audio ADCs and DACs. The processing speed of the SigmaDSP® core is 28 bits (56 bits double precision). With the help of equalization, limiting, multiband compression, and third-party branded algorithms, the processor enables system designers to account for the practical limitations of microphones, amplifiers, speakers, and listening environments, dramatically improving the perceived audio quality. Programming the ADAU1761 involves using the graphical programming tool SigmaStudioTM.

This software offers audio processing blocks for quickly building bespoke signal flows, such as mixers, dynamics processors, filters, and low-level DSP functions. The record path includes six inputs and an integrated bias circuit for the microphone. Before the ADC, the inputs can be mixed and mixed or set up to skip the ADC. A stereo digital microphone input is included on the ADAU1761. In order to support stereo headphones, an earpiece, or other output transducers, the ADAU1761 has five high-power output drivers. Capless or AC-coupled setups are both supported. On each analog output, a separate fine-level control is supported. Flexible audio routing is possible thanks to the output mixing stage.

ADAU1761BCPZ Features

• A number of characteristics make the SigmaDSP 28/56-bit, 50 MIPS digital audio processor a flexible and effective option for audio processing applications. Its ability to be fully programmed using the graphical SigmaStudio tool enables flexibility and customization to satisfy unique audio processing needs.
• The SigmaDSP’s 24-bit stereo audio ADC and DAC, which achieves an excellent signal-to-noise ratio (SNR) of over 98 dB, is one of its primary characteristics. Because of this, it is appropriate for various audio applications that require high-quality audio processing.
• The SigmaDSP also supports sample speeds ranging from 8 to 96 kHz, making it a flexible solution for various audio processing requirements. Additionally, it uses little power (7 mW for recording and playback at 48 kHz and 1.8 V), contributing to energy conservation and making it an environmentally friendly choice.
• Six analog input pins on the SigmaDSP can be set up as single-ended or differential inputs, providing versatility in signal processing. It can easily handle a variety of audio inputs because of its adaptable analog input/output mixers and stereo digital microphone input.
• The device has analog outputs that allow it to meet various output needs, including two differential stereos, two single-ended stereos, and one headphone output driver in mono. The PLL is extremely dependable and steady, with input clock support ranging from 8 MHz to 27 MHz.
• In order to ensure accurate and effective control over the audio signal, the SigmaDSP additionally features analog automatic level control (ALC) and microphone bias reference voltage. Its analog and digital I/O range from 1.8 V to 3.65 V, making various devices compatible.
• In order to give customers a variety of control options, the device also supports control interfaces, including I2C and SPI, as well as digital audio serial data I/O in stereo and time-division multiplexing (TDM) modes. Simpler operation is made possible by the software-controllable clickless mute and power-down capabilities, and more digital controls and outputs are made available by the GPIO pins.

Finally, the SigmaDSP can be used in various environments thanks to its operating temperature range of -40°C to +85°C. It offers a space-saving solution that may be easily integrated into various devices thanks to its small size of 5 mm and 5 mm LFCSP.

ADAU1761BCPZ Theory of Operation

The ADAU1761 is a stream-oriented DSP core integrated into a low-power audio codec, making it an all-in-one device that provides high-quality audio, low power, a tiny form factor, and a number of sophisticated capabilities. The stereo DAC and ADC have a THD + N of at least 90 dB and an SNR of at least +98 dB. The serial data port supports I2 S, left-justified, right-justified, and TDM modes for interacting with digital audio data. An onboard regulator produces the internal digital supply voltage; the operating voltage range is 1.8 V to 3.65 V.

The seamless connection of electret microphones is made possible by a microphone bias pin. Depending on the input arrangement, up to six single-ended analog signals, stereo differential signals, or stereo single-ended signals, plus two additional auxiliary single-ended inputs, may be accepted. The ADCs can be skipped by routing the input signals directly to the playback path output mixers, each with its own programmable gain amplifiers (PGA) for volume adjustment. An automated level control (ALC) can also be used to maintain a steady recording volume. High-quality 24-bit – converters with 64 or 128 oversampling ratios are used in the ADCs and DACs.

The input clock rate determines the converters’ basic sampling rate, which can be scaled further using the values in the converter control register. From 8 kHz to 96 kHz, the converters can work as sampling frequencies. Moreover, the ADCs and DACs have digital volume controls with incredibly small steps. The output configurations can be varied using the playback path to combine input signals with DAC outputs. For a stereo headphone output, headphones are provided, and the other output pins can drive an earpiece speaker differentially. Using the mono output as a virtual ground connection enables capless headphone outputs. The stereo line outputs can be mixed-down mono outputs, single-ended or differential outputs, or both.

Numerous features introduced by the DSP core give this codec its distinctiveness and audio processing optimization. Custom audio processing signal flows created with Analog Devices, Inc.’s SigmaStudio graphical programming software can be put into the program and parameter RAMs. Individual signal processing units, such as equalization filters, audio delays, and mixer levels, dynamics processors, are controlled by the values stored in the parameter RAM.

Through the control port, the SigmaDSP is programmed and controlled by the SigmaStudio software. The tools allow for the construction and adjustment of a signal flow and the configuration of each DSP register. Anyone with digital or analog audio processing knowledge can easily design and port a DSP signal flow to a target application using the SigmaStudio graphical user interface.

In addition, it offers sufficient adaptability and programmability to provide a skilled DSP programmer with complete control over the design. Using the control port, the user can load program and parameter files into the ADAU1761 memory, compile the design, and link graphical blocks in SigmaStudio. Graphical blocks include biquad filters, dynamics processors, mixers, and delays. The following signal-processing building pieces are included in the libraries that are provided:

• Improved stereo recording.
• Biquad filters with single- and double-precision.
• the FIR filters.
• Dynamics processors for mono and multichannel dynamics with peak or rms detection.
• splitters and mixers.
• generators of sound and tone.
• Gain that is fixed and variable.
• improvement in stereo.
• dynamism in the bass.
• sources of tone and noise.
• degree sensors.

Development of new processing blocks is ongoing. In addition, Analog Devices offers both proprietary and third-party algorithms for software used in surround virtualizers, matrix decoding, and bass augmentation.

Using the onboard fractional PLL, the ADAU1761 can produce its internal clocks from various input clocks. The PLL will take inputs between 8 MHz and 27 MHz. A tiny, 32-lead, 5 mm by 5 mm LFCSP with an exposed bottom pad is what the ADAU1761 comes in.

Conclusion

In conclusion, the ADAU1761 is a flexible and potent stereo audio codec that may be used for various audio processing tasks. It is a fantastic option for developers who wish to design high-quality audio systems due to its many capabilities, which include a SigmaDSP processor, stereo audio ADC and DAC, and different output drivers. Its low power usage and eco-friendliness also contribute to its attractiveness.

Constructing bespoke signal flows using the graphical development tool in Sigma Studio is simple and quick. In conclusion, the ADAU1761 is an excellent option for audio applications because it provides high audio quality and flexibility in a small, energy-efficient chassis. Contact ICRFQ, China’s top supplier of electrical components, for exceptional customer service and a large range of high-quality components if you want to get your hands on this or any other electrical component.

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