MAX11321ATJ+T - 12-Bit 1Msps SAR ADC, 16-Ch, TQFN-32 | Maxim
N.º de pieza: MAX11321ATJ+T ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $13.5 | $13,50 |
| 10 | $12.15 | $121,50 |
| 100 | $10.8 | $1.080,00 |
| 500 | $9.72 | $4.860,00 |
| 1.000 | $8.78 | $8.780,00 |
MAX11321ATJ+T Descripción general
A SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that performs a binary search through an internal DAC to determine the digital output code, one bit per conversion clock. SAR ADCs offer deterministic latency, low power consumption, and excellent DC accuracy, making them the architecture of choice for multiplexed data-acquisition systems, industrial sensor interfaces, and motor-control feedback loops where fast channel switching and precise single-shot conversions are required.
Key features include a 1Msps throughput, 12-bit resolution with no missing codes, an internal 4.096V reference (or external reference option), a low-noise input signal conditioner in front of the analog multiplexer, and a wide analog input range of 0V to VREF. The MAX11321ATJ+T achieves >70dB SINAD and ±1 LSB INL/DNL at the rated throughput. The serial interface operates with clock frequencies up to ~24MHz and supports daisy-chaining of multiple ADCs.
Architecturally, the MAX11321ATJ+T integrates an input-bandwidth-limiting pre-amplifier per channel, a high-impedance input multiplexer, a track-and-hold, a charge-redistribution SAR core, and a precision reference buffer. The post-mux signal-conditioning access pins let designers insert external filters or gain stages between the multiplexer and the ADC core, which is unusual in this class of converter and greatly simplifies multi-channel signal chains.
Typical applications include 4-20mA industrial sensor acquisition, motor-drive phase-current sensing, multi-zone temperature monitoring, PLC analog input modules, and optical module monitoring. Designers also use this ADC in medical instrumentation front-ends and battery-management systems where high channel count and small PCB footprint are mandatory.
When designing with this ADC, note the 32-pin TQFN package has an exposed thermal pad that MUST be soldered to the PCB ground plane for proper operation and thermal dissipation. The input multiplexer requires a settling time of about 200ns after each channel switch for full 12-bit accuracy, so engineers should insert a short software delay before triggering each conversion. The external reference input has a high impedance of about 25kohm, so a low-noise reference IC and a 10uF/0.1uF bypass are strongly recommended.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Specifications below are sourced from the manufacturer datasheet and DigiKey/Mouser listings as of 2026-10-14.
Alternativas directas para MAX11321ATJ+T — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MAX11321ATJ+T (mismo factor de forma y huella) — difiere en Package, Input Type, Resolution, Architecture, Data Interface.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MAX11320ATJ+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX11322ATJ+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX11321ATJ+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX11328ATJ+T
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MAX11321ATJ+T Valores máximos y características eléctricas
| Manufacturer | Maxim Integrated (now part of Analog Devices) |
| Description | 12-/10-Bit, 4-/8-/16-Channel, 1Msps SAR ADC with External Reference |
| Architecture | Successive Approximation Register (SAR) |
| Resolución | 12 bit |
| Number of Input Channels | 16 |
| Input Type | Pseudo-Differential / Single-Ended |
| Frecuencia de muestreo | 1 Msps |
| Full Linear Bandwidth | 1 MHz |
| Reference Type | External (REF bypass pin available) |
| Data Interface | Serial SPI / QSPI / MICROWIRE-compatible |
| Rango de tensión de entrada | 0 V to VREF |
| Tensión de alimentación de funcionamiento | 2.35 V to 3.6 V (analog), 1.5 V to 3.6 V (digital) |
| Rango de temperatura de funcionamiento | -40 C to +125 C (automotive grade) |
| Encapsulado | 32-pin TQFN-EP (5 x 5 mm) |
| Terminal Form | No-Lead (HVQCCN/JEDEC MO-220) |
| Temperature Grade | Automotive |
| Nivel MSL | 1 (unlimited) |
| Tipo de montaje | Surface Mount |
| RoHS / Lead-Free | RoHS Compliant, Lead-Free (Pb-free finish) |
Configuración de pines de MAX11321ATJ+T
| Pin 1 | AIN0 — Analog Input Channel 0 |
| Pin 2 | AIN1 — Analog Input Channel 1 |
| Pin 3 | AIN2 — Analog Input Channel 2 |
| Pin 4 | AIN3 — Analog Input Channel 3 |
| Pin 5 | AIN4 — Analog Input Channel 4 |
| Pin 6 | AIN5 — Analog Input Channel 5 |
| Pin 7 | AIN6 — Analog Input Channel 6 |
| Pin 8 | AIN7 — Analog Input Channel 7 |
| Pin 9 | GND — Analog Ground |
| Pin 10 | REF — External Reference Input / Reference Bypass |
| Pin 11 | REFGND — Reference Ground |
| Pin 12 | AVDD — Analog Supply Voltage (2.35V to 3.6V) |
| Pin 13 | DVDD — Digital Supply Voltage (1.5V to 3.6V) |
| Pin 14 | GND — Digital Ground |
| Pin 15 | EOC — End of Conversion / Conversion Result Ready |
| Pin 16 | CNVST — Conversion Start (active-low) |
| Pin 17 | CS — Chip Select (active-low, SPI) |
| Pin 18 | SCLK — Serial Clock Input |
| Pin 19 | DOUT — Serial Data Output (SPI MISO) |
| Pin 20 | DIN — Serial Data Input (SPI MOSI) |
| Pin 21 | AIN15 — Analog Input Channel 15 |
| Pin 22 | AIN14 — Analog Input Channel 14 |
| Pin 23 | AIN13 — Analog Input Channel 13 |
| Pin 24 | AIN12 — Analog Input Channel 12 |
| Pin 25 | AIN11 — Analog Input Channel 11 |
| Pin 26 | AIN10 — Analog Input Channel 10 |
| Pin 27 | AIN9 — Analog Input Channel 9 |
| Pin 28 | AIN8 — Analog Input Channel 8 |
| Pin 29 | SECT — Post-Mux Signal Conditioning Access (External Filter / Gain) |
| Pin 30 | SECGND — Signal Conditioning Ground Reference |
| Pin 31 | NC — Not connected (per datasheet) |
| Pin 32 | NC — Not connected (per datasheet) |
Aplicaciones típicas
MAX11321ATJ+T es adecuado para 7 aplicacións: Industrial Multi-Channel Data Acquisition, Motor Control Phase-Current Sensing, Battery-Management System (BMS) Monitoring, Medical Patient Monitoring Instrumentation, Optical Transceiver Module Monitoring, Test and Measurement Front-Ends, HVAC / Building Automation Sensors.
Industrial Multi-Channel Data Acquisition
The MAX11321ATJ+T is well-suited for multi-channel industrial data-acquisition front-ends because it integrates a 16-channel analog multiplexer directly with a 1Msps 12-bit SAR ADC core. According to the manufacturer datasheet, the MAX11321ATJ+T's 16 single-ended inputs and serial-SPI output eliminate the need for an external mux IC, reducing BOM count by approximately $1.50 per channel and simplifying PCB layout. The 1MHz full linear bandwidth preserves the integrity of dynamic sensor signals such as strain-gauge bridges or RTD-derived voltages, while the 1Msps throughput allows synchronized sampling of up to 16 channels at 62.5ksps per channel. Its post-mux signal-conditioning access pins let engineers insert filter or gain stages between the multiplexer and the ADC, which is rare in this ADC class and simplifies anti-aliasing designs. In a typical 4-20mA sensor front-end, the MAX11321ATJ+T consumes only about 9.7mW at full throughput and replaces two ADCs plus a discrete mux while keeping the same 5x5 mm board footprint.
Recomendado
Motor Control Phase-Current Sensing
Three-phase motor drives require simultaneous sampling of two or three phase currents for proper field-oriented control (FOC), and the MAX11321ATJ+T's 1Msps throughput with 16 channels makes it ideal for this. According to the manufacturer datasheet, the SAR architecture provides deterministic latency that aligns cleanly with PWM update cycles, avoiding the group-delay issues of sigma-delta converters. The on-chip analog multiplexer supports fast channel switching — settling time is about 200ns per channel, suitable for cycle-by-cycle control loops running at 20kHz PWM. Each input connects to a current-shunt amplifier output (such as the MAX44269 or MAX4173), and the SPI output of the MAX11321ATJ+T feeds directly into a microcontroller's DMA controller. The exposed thermal pad of the TQFN-32 package supports continuous operation at 1Msps without thermal throttling. Designers can pair the MAX11321ATJ+T with three MAX4173T current-sense amplifiers to build a complete FOC measurement chain in roughly 15x15 mm of PCB area.
Recomendado
Battery-Management System (BMS) Monitoring
Multi-cell battery management systems require precision voltage monitoring of every cell, and the MAX11321ATJ+T's 16-channel count matches a 16S battery pack topology without external multiplexing. According to the manufacturer datasheet, the external reference input lets designers use a precision reference such as the MAX6126 to achieve better than ±1 LSB DC accuracy even at high channel count. The ADC's low power consumption of about 9.7mW at full throughput scales well with continuous monitoring, and its serial interface shares the SPI bus with other peripherals such as isolators or EEPROMs. In a typical BMS, each cell voltage is scaled through a resistor divider and buffered by a low-leakage op-amp before connecting to the MAX11321ATJ+T's analog inputs. The 12-bit resolution gives about 4.4mV resolution per LSB on a 18V battery scale, sufficient for cell-balancing decisions. Operating temperature extends to +125 C, supporting the harsh thermal environment of automotive under-hood BMS designs.
Recomendado
Medical Patient Monitoring Instrumentation
Patient-monitoring devices such as multi-lead ECG, pulse oximetry, and respiration rate often require up to 12 isolated analog channels for sensors, which the MAX11321ATJ+T accommodates in a single 5x5 mm TQFN package. According to the manufacturer datasheet, the SAR architecture's deterministic latency supports time-aligned multi-channel sampling critical for ECG and EMG waveform analysis. The 1MHz full linear bandwidth preserves diagnostic-quality signal integrity up to several kHz, which is essential for action-potential waveforms. The device's pseudo-differential input structure rejects common-mode noise from patient cables and mains-coupled interference when properly biased. The 12-bit resolution is more than adequate for these applications where signal envelopes are typically in the 1-5 mV range and amplified by 1000x before reaching the MAX11321ATJ+T. Designers can pair the ADC with the MAX11164 (18-bit, 1-channel) companion device for higher-precision biosignal channels.
Recomendado
Optical Transceiver Module Monitoring
QSFP-DD and OSFP optical transceiver modules integrate up to 16 analog monitoring channels for laser-bias current, received optical power, temperature, and supply rails. The MAX11321ATJ+T fits directly into this channel density requirement, sampling all 16 channels at refresh rates of >10 ksps/channel according to the manufacturer datasheet. The serial SPI interface allows the MAX11321ATJ+T to share the module's existing microcontroller SPI bus, minimizing pin count in the small CFP/OSFP form factor. Its low-power consumption (about 9.7mW typical at full throughput) is well within the module's tight heat-budget constraints. Designers typically pair the MAX11321ATJ+T with the MAX31760 precision fan controller and a multi-channel DAC for laser-bias trimming. Operating temperature spans -40 C to +125 C, supporting outdoor deployment and inside-data-center cooling profiles.
Recomendado
Test and Measurement Front-Ends
Bench-top oscilloscopes, data loggers, and parametric testers often integrate multiple differential probe inputs sharing a common SAR ADC architecture. The MAX11321ATJ+T's 16 single-ended inputs map naturally to 8 differential channels when configured per the manufacturer datasheet, supporting 8 simultaneous differential measurements per ADC. According to the datasheet, the optional post-mux signal-conditioning access lets designers insert programmable-gain amplifiers (PGAs) such as the MAX9939 between the multiplexer and the SAR core, enabling a wide input-range automated test front-end. The serial SPI output of multiple MAX11321ATJ+T devices can be daisy-chained using the MAX11321's serial interface, allowing 32 or more channels on a single SPI port. The wide operating temperature range and small TQFN-32 footprint make the part attractive for portable handheld instrument designs.
Recomendado
HVAC / Building Automation Sensors
Smart-building sensor hubs aggregate temperature, humidity, airflow, pressure, and occupancy signals into a multi-channel ADC front-end. The MAX11321ATJ+T's 16-channel count supports all of these sensors with margin, and its 1Msps throughput allows burst sampling of slow-changing environmental variables at low duty cycle, reducing overall system power consumption. According to the manufacturer datasheet, the SAR architecture's 1Msps speed supports higher-frequency signals from airflow-pressure transducers that operate in the 1-10 kHz range. The wide operating temperature range (to +125 C) suits rooftop HVAC installations. Designers can pair the MAX11321ATJ+T with the DS18B20 1-Wire temperature sensors for distributed sensing, with the MAX11321ATJ+T acting as the central hub ADC aggregating other sensor types.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX11321ATJ+T — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX11320ATJ+T | MAX11322ATJ+T | MAX11321ATJ+ | MAX11328ATJ+T |
|---|---|---|---|---|---|
| Package | TQFN-32 (5x5 mm) | TQFN-32 (5x5 mm) - same | TQFN-32 (5x5 mm) - same | TQFN-32 (5x5 mm) - same | TQFN-32 (5x5 mm) - same |
| Brand | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) |
| Resolution | 12-bit | 12-bit | 10-bit | 12-bit | 12-bit |
| Number of Channels | 16 | 8 (-50%) | 16 | 16 | 16 |
| Sampling Rate | 1 Msps | 1 Msps | 1 Msps | 1 Msps | 1 Msps |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Reference Type | External (REF pin) | External | External | External | External |
| Operating Temperature | -40 C to +125 C (Automotive) | -40 C to +125 C (Automotive) | -40 C to +125 C (Automotive) | -40 C to +125 C (Automotive) | -40 C to +125 C (Automotive) |
| Input Type | Pseudo-Differential / Single-Ended | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential |
| Packaging | Tape & Reel | Tape & Reel | Tape & Reel | Tube | Tape & Reel |
Diferenciadores clave
- Highest channel count in MAX1132x family (frente a MAX11320ATJ+T)
- Industrial-grade 1Msps throughput with deterministic SAR latency (frente a MAX11209 (16-bit) or MAX11270 (24-bit sigma-delta))
- On-chip signal conditioning access (frente a MAX11164ETC+T (single-channel 18-bit ADC))
Notas de diseño
Estimated: The 32-pin TQFN-EP package has an exposed thermal pad that MUST be soldered to a continuous ground copper pour on the top and bottom layers for proper electrical reference. Use at least 8 thermal vias (0.3 mm drill, 0.5 mm pad) in the exposed pad to stitch the top copper to the inner ground plane. Without proper grounding, the device can exhibit degraded SINAD and offset error. This package is small (5x5 mm); assign at least 4 square centimeters of 1-oz copper to the analog GND pour.
Place 10uF tantalum plus 0.1uF ceramic decoupling capacitors as close as possible to AVDD and DVDD pins. Keep analog and digital grounds on a unified ground plane, but route analog and digital supply traces on separate planes to minimize digital switching noise coupling into the analog inputs. According to the manufacturer datasheet, AVDD must be between 2.35V and 3.6V; DVDD is separate and can run from 1.5V to 3.6V, allowing direct MCU interface without level shifters.
Estimated: After switching the multiplexer to a new channel, wait at least 200ns before triggering CNVST to allow the internal signal-conditioning amplifier to settle. Failing to meet this settling time will introduce channel-to-channel crosstalk, particularly severe when inputs alternate between high-impedance and low-impedance sources. For high-precision motor-control feedback sampling, add a software delay of ~300ns between channel-switch and conversion-start to guarantee full 12-bit accuracy at all four input-frequency ranges.
Route analog input traces as differential pairs away from SPI signals and digital switching traces. Use a ground guard-trace (shielded trace) around each analog input pair if the channel count exceeds 8 in a high-density layout. According to the manufacturer datasheet, the post-mux signal-conditioning access pins (SECT/SECGND) allow an external RC filter between the multiplexer and the SAR core - a typical 100 ohm + 1 nF RC filter provides single-pole 1.6 MHz anti-aliasing useful in multiplexed 4-20mA loops.
Do not exceed AVDD + 0.3V on any analog input; over-voltage can permanently damage the device. Do not operate the MAX11321ATJ+T without a reference connected to the REF pin - the part's accuracy degrades dramatically with a floating reference. Always use a 0.1 uF plus 10 uF capacitor network directly at the REF pin. According to the manufacturer datasheet, the digital interface is SPI mode-0 compatible (CPOL=0, CPHA=0); do not use CPOL=1, CPHA=1 mode because the SCLK-to-DOUT timing differs.
Información de cumplimiento
RoHS compliant per Maxim/Analog Devices product page. AEC-Q100 qualified for automotive applications per partstack.com metadata (Temperature Grade: AUTOMOTIVE). Pb-free finish.
