Analog Devices Inc. AD1937WBSTZ

Overview

AD1937WBSTZ from Analog Devices is a high-performance audio codec IC integrating four 24-bit differential-input ADCs and eight 24-bit differential-output DACs, supporting sample rates up to 192 kHz with PLL-based clock generation. It delivers 112 dB DAC dynamic range (A-weighted) and −96 dB THD+N, operating from a single 3.3 V supply and qualified for automotive audio systems.

For engineers reviewing the AD1937WBSTZ datasheet, AD1937WBSTZ pinout, AD1937WBSTZ application, or AD1937WBSTZ equivalent, this page provides verified specifications, I²C-controllable volume/autoramp/mute, TDM/I²S/justified serial interface modes, and automotive-grade thermal performance in 64-lead LQFP.

Technical Context

The AD1937WBSTZ implements Analog Devices' patented multibit sigma-delta architecture for both ADCs and DACs, with on-chip digital antialiasing filters (79 dB stop-band attenuation) and reconstruction filters (70 dB stop-band attenuation). Its PLL supports 256×/384×/512×/768× f_S multiplication from LRCLK or MCLKI/MCLKXI, enabling suppressed-bit-clock operation.

ADCs operate at fixed 256× f_S internal clocking; DACs use 512× f_S (48 kHz), 256× f_S (96 kHz), or 128× f_S (192 kHz) clocks. All eight DAC channels feature independent 0.375 dB step log-volume control with autoramp, while ADCs include switchable 1.4 Hz high-pass filtering scaling with sample rate.

Key Specifications

Pinout & Package

AD1937WBSTZ is housed in a 64-lead LQFP (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Analog Devices Rev. B datasheet (Page 11–12), including dedicated differential I/O pairs, dual I²C control lines (SDA/SCL), programmable clock I/O (DBCLK/DLRCLK/ABCLK/ALRCLK), and integrated 5 V-to-3.3 V regulator (VSUPPLY/VSENSE/VDRIVE).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar audio codec applications.

Compared with AK4642EN and CS42526-CQZ, AD1937WBSTZ uniquely combines automotive qualification, integrated 5 V-to-3.3 V regulation, and 112 dB SNR in a single 64-LQFP package - reducing BOM count and thermal footprint in space-constrained head units.

Availability

AD1937WBSTZ is available at Aetrix Electronics and suitable for automotive infotainment systems, home theater AV receivers, and professional digital audio effects processors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD1937WBSTZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and connectivity.

The AD1937WBSTZ belongs to Analog Devices' automotive-qualified audio codec product line, designed specifically for noise-immune, high-SNR audio processing in harsh electromagnetic environments like vehicle cabins and industrial control panels.

FAQ

What is the maximum sample rate supported by the AD1937WBSTZ?

The AD1937WBSTZ supports sample rates from 8 kHz up to 192 kHz across all ADC and DAC channels. At 192 kHz, the DAC interpolation filter operates at 128× f_S, and the ADC decimation filter maintains 256× f_S oversampling. This capability is confirmed in the "Digital Filters" section (Page 7) and "Timing Specifications" table (Page 8) of the Rev. B datasheet, where 192 kHz timing parameters are explicitly defined for both DAC and ADC paths.

Does the AD1937WBSTZ require an external crystal oscillator?

No - the AD1937WBSTZ includes an on-chip PLL that can generate internal clocks from either an external master clock (MCLKI/MCLKXI) or frame clock (LRCLK), eliminating the need for an external crystal. The PLL supports 256×/384×/512×/768× f_S multiplication, and the crystal oscillator input (MCLKI/MCLKXI) is optional. When used, the crystal must meet transconductance ≥3.5 mmhos (Table 4, Page 5).

How does the AD1937WBSTZ handle power supply requirements?

The AD1937WBSTZ operates from three supply domains: 3.3 V analog (AVDD), 3.3 V digital (DVDD), and 4.5–5.5 V input to its integrated linear regulator (VSUPPLY). The regulator generates a stable 3.3 V internal rail (VSENSE) with ±3.5% tolerance, removing the need for external LDOs. This architecture is detailed in Table 6 (Page 6) and the "Regulator" subsection of the "Specifications" section.

Can the AD1937WBSTZ be used in TDM mode with more than eight channels?

Yes - the AD1937WBSTZ supports Time-Division Multiplexed (TDM) operation with up to 16 channels on a single data line. This is achieved using the TDM serial port configuration described in "Theory of Operation" (Page 20) and enabled via I²C register settings. The device's four DAC serial inputs (DSDATA1–4) and two ADC serial outputs (ASDATA1–2) can be reconfigured for TDM data in/out, allowing scalable channel counts without additional hardware.

Is the AD1937WBSTZ pin-compatible with other members of the AD193x family?

No - the AD1937WBSTZ is not pin-compatible with AD1938 or AD1939. While sharing functional similarities, the AD1937WBSTZ uses a 64-lead LQFP package with unique pin assignments (e.g., dedicated VSUPPLY/VSENSE/VDRIVE pins for internal regulation), whereas AD1938 uses 48-lead LQFP and AD1939 uses 64-lead LQFP with different pinouts (e.g., no integrated regulator pins). Pin compatibility is not claimed in the datasheet or ordering guide.