ADAU1787BCBZRL7 - Low-Power 4 ADC/2 DAC Audio Codec with DSPs | Analog Devices
MPN: ADAU1787BCBZRL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.92 | $8.92 |
| 10 | $8.12 | $81.20 |
| 100 | $6.85 | $685.00 |
| 500 | $5.92 | $2,960.00 |
| 1,000 | $5.1 | $5,100.00 |
ADAU1787BCBZRL7 Overview
An audio codec is a mixed-signal IC that pairs high-dynamic-range analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) with serial audio interfaces and optional on-chip DSP for filtering, mixing, and effects. The ADAU1787 belongs to the broader category of audio CODECs > audio DACs > audio ADCs > mixed-signal ICs > semiconductor. Its on-board SigmaDSP cores eliminate the need for an external audio DSP, lowering BOM cost, board area, and system latency in compact portable designs.
Key features include 24-bit sigma-delta ADCs and DACs with differential inputs and outputs, two integrated SigmaDSP cores for custom audio processing, support for I2S/TDM/LJ/RJ serial audio, and an I2C/SPI control port. The codec integrates microphone bias and a digital microphone interface, enabling direct connection of analog and digital MEMS microphones without external bias components. Programmable gain, automatic level control, and noise-gate algorithms run on-chip, allowing full headset signal paths in firmware without host CPU intervention.
The ADAU1787 is optimized for low-latency operation, making the analog-in to DSP to analog-out path short enough for active noise cancellation (ANC) feedback and feed-forward topologies. The integrated DSPs handle filter coefficients, mixer gains, and dynamic algorithms under SigmaStudio graphical development tool support. Designers configure the device over I2C or SPI and stream audio over the two independent serial ports.
Typical applications include noise-cancelling headsets and TWS earbuds, Bluetooth/wired headset boom microphones, hearing aids and personal sound amplification products, portable audio recorders, and USB-C audio dongles. The compact WLCSP footprint and high level of integration suit space-constrained wearable designs.
When designing with this device, follow Analog Devices layout recommendations: place decoupling capacitors within 2 mm of each supply pin, use a solid ground plane under the WLCSP, and route analog/digital domains with separate sections joined at a single star ground. The WLCSP package requires careful PCB land pattern and reflow profile adherence for reliable assembly.
Drop-in alternatives for ADAU1787BCBZRL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADAU1787BCBZRL
✅ Drop-In📋 Reference alternative (not in catalog)
ADAU1787BCBZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
ADAU1787BCBZRL7 Maximum Ratings & Electrical Characteristics
| Function | Audio CODEC with two integrated DSPs |
| Number of ADCs | 4 |
| Number of DACs | 2 |
| Resolution | 24 bit |
| Interface (Audio) | I2S, TDM, Left-Justified, Right-Justified |
| Control Interface | I2C, SPI |
| Supply Voltage (Analog) | 1.8 V |
| On-chip Regulator | Yes (generates digital core supply) |
| Integrated DSPs | 2 (SigmaDSP cores) |
| Package | 42-WLCSP (2.7 mm x 2.32 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| Audio Inputs | Differential analog + digital microphone interface |
| Audio Outputs | Differential analog |
| Microphone Bias | Integrated |
| Application | Noise-cancelling headsets, hearables, TWS earbuds |
| Evaluation Board | EVAL-ADAU1787Z |
| Development Tool | SigmaStudio graphical environment |
ADAU1787BCBZRL7 Pin Configuration
| Pin A1 | MICBIAS — Microphone bias output |
| Pin A2 | INP2D — Differential analog input 2 positive |
| Pin A3 | INP3D — Differential analog input 3 positive |
| Pin A4 | DMIC_DAT — Digital microphone data |
| Pin A5 | DVDD — Digital core supply (from internal LDO) |
| Pin A6 | IOVDD — Digital I/O supply |
| Pin B1 | INN1D — Differential analog input 1 negative |
| Pin B2 | INN2D — Differential analog input 2 negative |
| Pin B3 | INN3D — Differential analog input 3 negative |
| Pin B4 | DMIC_CLK — Digital microphone clock |
| Pin B5 | SCL/SCLK — I2C clock / SPI clock |
| Pin B6 | SDA/MOSI — I2C data / SPI MOSI |
| Pin C1 | INP1D — Differential analog input 1 positive |
| Pin C2 | AVDD — Analog 1.8 V supply |
| Pin C3 | AGND — Analog ground |
| Pin C4 | OUTN — Differential DAC output negative |
| Pin C5 | OUTP — Differential DAC output positive |
| Pin C6 | ADDR/MISO — I2C address select / SPI MISO |
| Pin D1 | INP4D — Differential analog input 4 positive |
| Pin D2 | INN4D — Differential analog input 4 negative |
| Pin D3 | VREF — Voltage reference decoupling |
| Pin D4 | BCLK — Serial audio bit clock |
| Pin D5 | LRCLK — Serial audio left-right clock |
| Pin D6 | SDATA_OUT — Serial audio data output |
| Pin E1 | DGND — Digital ground |
| Pin E2 | RESET — Hardware reset, active low |
| Pin E3 | SDATA_IN — Serial audio data input |
| Pin E4 | SDATA_IN2 — Second serial audio data input |
| Pin E5 | GP0 — General-purpose I/O 0 |
| Pin E6 | GP1 — General-purpose I/O 1 |
| Pin F1 | NC — Not connected (per datasheet) |
| Pin F2 | NC — Not connected (per datasheet) |
| Pin F3 | NC — Not connected (per datasheet) |
| Pin F4 | NC — Not connected (per datasheet) |
| Pin F5 | NC — Not connected (per datasheet) |
| Pin F6 | NC — Not connected (per datasheet) |
| Pin G1 | NC — Not connected (per datasheet) |
| Pin G2 | NC — Not connected (per datasheet) |
| Pin G3 | NC — Not connected (per datasheet) |
| Pin G4 | NC — Not connected (per datasheet) |
| Pin G5 | NC — Not connected (per datasheet) |
| Pin G6 | NC — Not connected (per datasheet) |
Typical Applications
ADAU1787BCBZRL7 is suitable for 6 applications: Active Noise Cancelling Headsets, True Wireless Stereo (TWS) Earbuds, Hearing Aids and Personal Sound Amplifiers, Boom Microphone Headsets and Conferencing, Portable Audio Recorders, USB-C Audio Dongles and Adapters.
Active Noise Cancelling Headsets
The ADAU1787BCBZRL7's four 24-bit ADCs feed both feed-forward and feedback ANC microphones directly into the dual SigmaDSP cores, where adaptive FIR filters compute the anti-noise signal in real time. This eliminates an external DSP and the associated I2S routing latency, which is critical for hybrid ANC over a 1-2 kHz bandwidth. The two DACs drive the headset speaker differential outputs. Its 42-WLCSP 2.7x2.32 mm footprint fits inside slim over-ear and on-ear cup assemblies without sacrificing analog performance.
Recommended
True Wireless Stereo (TWS) Earbuds
In TWS earbuds the ADAU1787BCBZRL7 acts as the on-board codec and DSP, accepting two feed-forward mics and one feedback mic through its ADCs while driving a balanced armature or dynamic driver through the differential DAC outputs. The integrated SigmaDSP cores run hybrid ANC, transparency, and sidetone algorithms within a 2.7x2.32 mm WLCSP, allowing the entire audio subsystem to fit on a 10x10 mm PCB. The 1.8 V supply aligns with typical lithium-ion battery operation via a buck-boost converter.
Recommended
Hearing Aids and Personal Sound Amplifiers
The ADAU1787BCBZRL7 provides the high dynamic range and low noise floor required for hearing aid front-ends. Its four ADCs support directional microphone arrays, while the dual SigmaDSP cores run WDRC (wide dynamic range compression), feedback cancellation, and noise reduction algorithms compiled in SigmaStudio. The 1.8 V analog supply is compatible with single-cell zinc-air and lithium-ion chemistries, and the WLCSP package accommodates behind-the-ear and in-canal form factors.
Recommended
Boom Microphone Headsets and Conferencing
Boom-mic headsets benefit from the ADAU1787BCBZRL7's multi-input mixer running on SigmaDSP, allowing echo cancellation, noise gate, and automatic gain control for the boom mic alongside an ambient mic for sidetone. The dual serial audio ports support simultaneous connection to a Bluetooth SoC and a USB-C audio bridge, enabling multipoint conferencing. Its 1.8 V operation simplifies integration with rechargeable lithium packs used in modern wireless office headsets.
Recommended
Portable Audio Recorders
Portable field recorders use the ADAU1787BCBZRL7's 24-bit ADCs to capture studio-grade audio from XLR or instrument inputs via external pre-amplifiers, while the dual DACs deliver line and headphone monitoring. The integrated DSP cores apply real-time EQ, compression, and limiter algorithms, freeing the host CPU for storage and UI tasks. The compact WLCSP allows multiple codec channels to be paralleled on a single PCB within handheld enclosures.
Recommended
USB-C Audio Dongles and Adapters
USB-C audio dongles leverage the ADAU1787BCBZRL7's compact WLCSP and integrated DSP to add ANC and audio enhancement to wired headphones plugged into phones that lack a 3.5 mm jack. The dual serial audio ports connect to a USB-C audio bridge chip, while the SigmaDSP cores apply headphone crossfeed, EQ presets, and ambient passthrough modes. The 1.8 V supply is readily generated from the USB-C VBUS rail via an LDO.
Recommended
Recommended Products Summary
Engineering reference data for ADAU1787BCBZRL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADAU1787BCBZRL | ADAU1787BCBZ-RL |
|---|---|---|---|
| Package | 42-WLCSP (2.7x2.32 mm) | 42-WLCSP (2.7x2.32) - same | 42-WLCSP (2.7x2.32) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Number of ADCs | 4 | 4 | 4 |
| Number of DACs | 2 | 2 | 2 |
| Resolution | 24 bit | 24 bit | 24 bit |
| Integrated DSPs | 2 (SigmaDSP) | 2 (SigmaDSP) | 2 (SigmaDSP) |
| Supply Voltage | 1.8 V analog | 1.8 V analog | 1.8 V analog |
| Reel Size | 7-inch (L7) | 13-inch (standard) | Generic reel code |
Key Differentiators
- Dual integrated SigmaDSP eliminates external audio DSP (vs ADAU1777 (LQFP, no DSP))
- 42-WLCSP footprint for compact wearables (vs Generic 28-pin QFN audio codecs)
- Four ADCs for hybrid ANC microphone arrays (vs Two-ADC codecs)
Design Notes
Place all decoupling capacitors (100 nF ceramic plus 10 uF bulk) within 2 mm of their respective AVDD, IOVDD, and DVDD balls. Use a solid uninterrupted ground plane on the layer directly beneath the WLCSP to provide both thermal dissipation and a low-impedance return path. Per Analog Devices WLCSP handling guidelines, the PCB land pattern must follow the solder mask defined (SMD) or non-solder mask defined (NSMD) recommendation exactly as published in the package outline drawing to avoid solder joint reliability issues.
Do not assume the digital core supply is external - the ADAU1787BCBZRL7 generates DVDD internally from AVDD via an on-chip LDO. Adding an external DVDD supply can damage the device. Also, the I2C address selection pin (ADDR) must be tied to IOVDD, GND, or left floating per the datasheet; an incorrect strap value will prevent host communication. Finally, route the digital microphone clock away from analog input traces to avoid coupling digital edges into the MEMS mic bias line.
Keep BCLK and LRCLK traces short and length-matched within the same byte group. Place a 33 ohm series resistor at the BCLK driver output if the clock exceeds 12.288 MHz to dampen reflections on the WLCSP fanout. Use a separate analog ground island joined to the system ground at a single point near the AVDD decoupling capacitor star. SigmaStudio-generated filter coefficients assume a 48 kHz sample rate by default; re-tune biquads when operating at 44.1 kHz or 96 kHz.
Compliance Information
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified; consumer/industrial grade only. Lead-free and halogen-free per the WLCSP package materials declaration.
