AD1938YSTZ - 4ADC/8DAC 192kHz 24-Bit Audio CODEC LQFP-48 | ADI
Référence : AD1938YSTZ ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $9.18 | $9,18 |
| 10 | $8.55 | $85,50 |
| 100 | $7.83 | $783,00 |
| 500 | $7.32 | $3 660,00 |
| 1 000 | $7.04 | $7 040,00 |
AD1938YSTZ Présentation
An audio CODEC (coder-decoder) is a mixed-signal IC that converts analog audio signals to digital and digital audio signals back to analog, sitting at the intersection of the signal chain between analog transducers (microphones, amplifiers, speakers) and the digital signal processor (DSP) or microcontroller. The AD1938 belongs to the broader category of audio interface ICs, specifically the multi-channel CODEC family, and sits within Analog Devices' precision signal-chain portfolio for professional and prosumer audio.
Key features of the AD1938 include 107 dB DAC dynamic range and SNR, 107 dB ADC dynamic range, -94 dB THD+N, a low-EMI design with on-chip PLL for flexible clock generation, software-controllable clickless mute, a logarithmic volume control with autoramp function, and master/slave modes supporting up to 16 devices on a single TDM bus. The codec also integrates TDM, I2S, left-justified, and right-justified serial audio interface modes.
The AD1938 employs Analog Devices' patented multibit sigma-delta (Σ-Δ) modulator architecture with a switched-capacitor DAC topology. The integrated PLL allows direct MCLK input up to 27 MHz or generation of internal clocks from a 256 x Fs reference, simplifying board-level clock trees in multi-codec systems. The differential ADC input paths maximize common-mode rejection for balanced microphone or line-level capture.
Typical applications include automotive head units and infotainment systems, AV receivers, multichannel mixing consoles, musical instrument amplifiers, effects processors, and broadcast audio equipment. The single 3.3 V supply and 5 V tolerant digital inputs simplify integration into mixed-voltage systems alongside host DSPs or microcontrollers.
When designing with the AD1938, ensure adequate decoupling on both AVDD and DVDD rails (typically 10 uF bulk plus 0.1 uF ceramic per pin) and place the master-clock reference within 50 ppm tolerance to avoid PLL jitter. For TDM cascading above 8 channels, the AD1938 can serve as a master driving up to 15 additional slave codecs on a shared data line.
This page synthesizes distributor pricing, drop-in same-package alternatives, SPI register notes, and PCB-layout guidance not found in the manufacturer datasheet, providing a 360-degree engineering reference for sourcing the AD1938YSTZ.
Alternatives de remplacement direct pour AD1938YSTZ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AD1938WBSTZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD1938YSTZRL
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD1939YSTZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD1940YSTZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADAU1977WBSTZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD1938YSTZ Valeurs maximales et caractéristiques électriques
| Number of ADCs | 4 |
| Number of DACs | 8 |
| Résolution | 24 bit |
| Sample Rate Range | 8 kHz to 192 kHz |
| DAC Dynamic Range / SNR | 107 dB |
| ADC Dynamic Range / SNR | 107 dB |
| THD+N | -94 dB |
| ADC Input Type | Differential |
| DAC Output Type | Single-ended |
| Supply Voltage (Analog) | 3.3 V |
| Supply Voltage (Digital) | 3.3 V |
| Logic Input Tolerance | 5 V tolerant |
| Control Interface | SPI |
| Serial Audio Interface | I2S, LJ, RJ, TDM (up to 16 devices) |
| Clocking | On-chip PLL or direct MCLK |
| Master/Slave Modes | Master and Slave supported |
| Mute Function | Software-controllable clickless mute |
| Volume Control | Logarithmic with autoramp |
| Boîtier | 48-LQFP (7x7 mm) |
| Plage de température de fonctionnement | -40 C to +85 C (automotive: -40 to +105 C) |
| Statut RoHS | Compliant |
Configuration des broches de AD1938YSTZ
| Broche 1 | ADC0IN+ — ADC0 positive differential input |
| Broche 2 | ADC0IN- — ADC0 negative differential input |
| Broche 3 | ADC1IN+ — ADC1 positive differential input |
| Broche 4 | ADC1IN- — ADC1 negative differential input |
| Broche 5 | FILT+ — Positive reference filter capacitor |
| Broche 6 | FILT- — Negative reference filter capacitor |
| Broche 7 | AVDD — Analog supply (3.3 V) |
| Broche 8 | AGND — Analog ground |
| Broche 9 | AVDD — Analog supply (3.3 V) |
| Broche 10 | ADC2IN+ — ADC2 positive differential input |
| Broche 11 | ADC2IN- — ADC2 negative differential input |
| Broche 12 | DVDD — Digital supply (3.3 V) |
| Broche 13 | DGND — Digital ground |
| Broche 14 | MCLK — Master clock input |
| Broche 15 | BCLK — Bit clock for serial audio |
| Broche 16 | LRCLK — Word clock / left-right clock |
| Broche 17 | SDATA_OUT — Serial audio data output (ADC to host) |
| Broche 18 | SDATA_IN — Serial audio data input (host to DAC) |
| Broche 19 | MOSI — SPI data input |
| Broche 20 | SCLK — SPI clock |
| Broche 21 | CS — SPI chip select (active low) |
| Broche 22 | MUTE — Hardware mute (active low) |
| Broche 23 | PD/RST — Power-down / reset (active low) |
| Broche 24 | DVDD — Digital supply (3.3 V) |
| Broche 25 | DGND — Digital ground |
| Broche 26 | DAC0OUT — DAC0 single-ended output |
| Broche 27 | DAC1OUT — DAC1 single-ended output |
| Broche 28 | DAC2OUT — DAC2 single-ended output |
| Broche 29 | DAC3OUT — DAC3 single-ended output |
| Broche 30 | DAC4OUT — DAC4 single-ended output |
| Broche 31 | DAC5OUT — DAC5 single-ended output |
| Broche 32 | DAC6OUT — DAC6 single-ended output |
| Broche 33 | DAC7OUT — DAC7 single-ended output |
| Broche 34 | AGND — Analog ground |
| Broche 35 | AVDD — Analog supply (3.3 V) |
| Broche 36 | VREF — Voltage reference decoupling |
| Broche 37 | ADC3IN+ — ADC3 positive differential input |
| Broche 38 | ADC3IN- — ADC3 negative differential input |
| Broche 39 | AGND — Analog ground |
| Broche 40 | AVDD — Analog supply (3.3 V) |
| Broche 41 | AVDD — Analog supply (3.3 V) |
| Broche 42 | AGND — Analog ground |
| Broche 43 | AVDD — Analog supply (3.3 V) |
| Broche 44 | NC — Not connected (per datasheet) |
| Broche 45 | NC — Not connected (per datasheet) |
| Broche 46 | NC — Not connected (per datasheet) |
| Broche 47 | NC — Not connected (per datasheet) |
| Broche 48 | EP — Exposed pad (thermal/ground) |
Applications typiques
AD1938YSTZ convient pour 6 applications: Automotive Head Unit / Infotainment, Multichannel Mixing Console / Studio Audio, AV Receiver / Home Theater, Musical Instrument Amplifier / Effects Processor, Broadcast / Professional Audio Equipment, Multichannel USB Audio Interface.
Automotive Head Unit / Infotainment
The AD1938YSTZ integrates 4 differential ADC inputs for multi-microphone or line-level capture (hands-free, navigation prompts, rear-seat audio) and 8 single-ended DAC outputs for zone audio routing (front, rear, subwoofer, individual channels), all in a single 48-LQFP. Its 107 dB DAC SNR and -94 dB THD+N deliver clean audio reproduction at the head-unit output stage. The single 3.3 V supply simplifies power-tree design alongside an automotive PMIC, and the integrated PLL removes the need for an external audio-grade crystal. For AEC-Q100-qualified builds, the AD1938WBSTZ variant drops in without PCB changes.
Recommandé
Multichannel Mixing Console / Studio Audio
Recording consoles and studio interfaces benefit from the AD1938YSTZ's 4 differential ADC inputs (capturing balanced XLR mic/line signals with high common-mode rejection) and 8 single-ended DAC outputs (driving 7.1 surround monitor paths or multiple headphone busses). The 107 dB dynamic range preserves the headroom required for 24-bit/192 kHz studio recording. SPI control allows real-time routing changes via a host MCU or DSP, while the TDM mode supports cascading up to 16 codecs for 64+ channel systems in large-format consoles.
Recommandé
AV Receiver / Home Theater
AVRs need 8 DAC channels for 7.1 surround playback, HDMI ARC input handling, and bass management - all of which the AD1938YSTZ provides in a single 48-LQFP with on-chip PLL. The 107 dB DAC SNR exceeds the -90 dB noise floor typically required for Dolby/DTS bitstream reproduction, while the clickless software mute prevents pop artifacts during track transitions. TDM mode lets one master AD1938 drive additional DAC channels via a slave codec on the same data line, simplifying board layout in slim-line AVR designs.
Recommandé
Musical Instrument Amplifier / Effects Processor
Guitar amplifiers and digital effects units use the AD1938YSTZ to capture instrument input via the 4 differential ADCs (one or two pickups, plus stereo aux input) and to output stereo wet/dry/effect-mixed audio via the 8 DACs. The 192 kHz max sample rate preserves high-frequency harmonics of cymbals and overdriven guitars, while 24-bit resolution captures the dynamic range needed for tube-emulation modeling. SPI control allows preset switching (clean, crunch, lead) without mechanical switches, and the logarithmic volume control with autoramp avoids zipper noise during gain sweeps.
Recommandé
Broadcast / Professional Audio Equipment
Broadcast mixing desks, audio routers, and pro-audio interfaces leverage the AD1938YSTZ's 107 dB SNR ADC and DAC paths for transparent signal capture and reproduction required by AES17 standards. The differential ADC inputs reject ground-loop noise common in installed studio wiring, while the 5 V tolerant digital interface simplifies connection to legacy 5 V logic control planes in installed broadcast equipment. TDM mode enables 16-codec cascades in OB (outside broadcast) vans where 64+ channel routing is required.
Recommandé
Multichannel USB Audio Interface
USB audio interfaces for music production require 8 outputs (5.1 surround + headphones) and multiple inputs for recording - the AD1938YSTZ provides exactly this in one chip, interfacing to a USB audio bridge IC like the XMOS XUF216 or Microchip PIC32MZ. The 192 kHz / 24-bit capability meets the ASIO requirements of DAW software, while the integrated PLL regenerates clocks from the USB host to maintain low jitter. The 48-LQFP footprint fits compact desktop enclosures, replacing two or three stereo CODECs in a multi-channel interface.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AD1938YSTZ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AD1938WBSTZ | AD1938YSTZRL | AD1939YSTZ | AD1940YSTZ | ADAU1977WBSTZ |
|---|---|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| ADC Channels | 4 differential | 4 differential | 4 differential | 4 differential | 8 differential | 4 differential |
| DAC Channels | 8 single-ended | 8 single-ended | 8 single-ended | 8 differential | 2 differential | 0 (no DACs) |
| Sample Rate | 8-192 kHz | 8-192 kHz | 8-192 kHz | 8-192 kHz | 8-192 kHz | 8-192 kHz |
| Control Interface | SPI | SPI | SPI | SPI | SPI | SPI |
| Automotive Grade | No | Yes (AEC-Q100, -40C to +105C) | No | No | No | Yes (AEC-Q100) |
| DAC SNR / Dynamic Range | 107 dB | 107 dB | 107 dB | 107 dB | 105 dB | N/A (no DAC) |
| Supply Voltage | 3.3 V single | 3.3 V single | 3.3 V single | 3.3 V single | 3.3 V single | 3.3 V single |
| TDM Cascade Support | Yes (up to 16 devices) | Yes (up to 16 devices) | Yes (up to 16 devices) | Yes (up to 16 devices) | Yes | Yes |
Principaux différenciateurs
- Highest channel count in 48-LQFP at this price tier (vs AD1940YSTZ)
- Integrated PLL eliminates external audio-grade crystal (vs PCM3168A (TI))
- Automotive-grade drop-in path with identical silicon (vs AD1938WBSTZ)
Notes de conception
The AD1938YSTZ requires clean 3.3 V on both AVDD and DVDD. Place a 10 uF tantalum or ceramic bulk capacitor plus a 0.1 uF ceramic decoupling capacitor as close as possible to each AVDD/DVDD pin. Use a ferrite bead or pi-filter to isolate the analog supply from digital switching noise on the host board. The FILT+ and FILT- pins require 10 uF + 0.1 uF to AGND; inadequate reference filtering is a common cause of measured THD+N degradation in production boards.
Use a 4-layer PCB with continuous ground plane under the AD1938YSTZ to minimize EMI. Keep the analog input traces (ADC0IN+/- through ADC3IN+/-) short and symmetric - mismatch greater than 1 mm between the + and - trace lengths converts common-mode noise into differential noise that the ADC cannot reject. Route MCLK and BCLK away from analog input traces; place the 48-LQFP exposed pad (pin 48) directly on a 5x5 mm copper pour with at least 8 thermal vias to the inner ground plane.
Common pitfalls when designing with the AD1938YSTZ include: (1) forgetting to write the PLL lock register after power-up, which leaves the codec in an unlocked state producing clicks/pops on all outputs; (2) routing DAC outputs through long PCB traces before the output filter, which degrades THD+N from -94 dB to -80 dB; (3) using a non-audio-grade MCLK source (jitter > 50 ps RMS), which raises DAC noise floor measurably; (4) failing to assert MUTE during SPI register writes, causing audible pops during configuration changes.
Estimated: At 3.3 V supply drawing ~70 mA analog + ~20 mA digital, total power dissipation is ~300 mW. With theta_JA of ~50 C/W for the LQFP-48 package on a 4-layer JEDEC test board, junction temperature rises 15 C above ambient at room temperature. The exposed pad (pin 48) must be soldered to a ground copper pour (5x5 mm minimum with 8 vias) to achieve the rated thermal performance. No external heatsink is required for typical audio applications.
Informations de conformité
RoHS compliant per Analog Devices product page. AD1938YSTZ is not AEC-Q100 qualified - use AD1938WBSTZ for automotive applications. Halogen-free status not explicitly stated in the provided data.
