MAX1321ECM+ - 14-Bit 4-Channel 357ksps Simultaneous-Sampling ADC | Maxim Integrated
N.º da peça: MAX1321ECM+ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $11.7396 | $11,74 |
| 10 | $10.8 | $108,00 |
| 100 | $9.65 | $965,00 |
| 500 | $8.55 | $4.275,00 |
| 1.000 | $7.95 | $7.950,00 |
MAX1321ECM+ Visão geral
What is an SAR ADC? A successive-approximation-register analog-to-digital converter is a sampling architecture that uses an internal DAC and a comparator to perform a binary search over multiple clock cycles, one bit at a time, yielding a snapshot conversion. SAR ADCs sit within the broader hierarchy of ADC technology -> data converter -> mixed-signal IC -> semiconductor device. The simultaneous-sampling capability of the MAX1321ECM+ makes it distinct from multiplexed ADCs: every enabled channel acquires its analog input at the same instant through per-channel track-and-hold amplifiers, eliminating channel-to-channel skew that would otherwise corrupt multi-phase measurements.
Key specifications include ±10 V true-differential inputs (over-voltage protected to ±25 V), 357 ksps aggregate throughput with internal or external clock, an internal 2.5 V or external reference, and per-channel T/H amplifiers. The device interfaces through a 20 MHz SPI/QSPI/MICROWIRE-compatible serial port with a dedicated RDY/INT output for conversion-complete indication. Bipolar and unipolar input modes are software-selected without external hardware changes.
The MAX1321ECM+ uses a charge-redistribution SAR core with input protection networks on each analog channel. The built-in T/H front-end and ±25 V over-voltage clamps allow direct connection to industrial ±10 V or ±15 V signal sources without external resistor dividers, while a digital noise-rejection filter rejects mains-frequency interference. Internal or external reference flexibility lets designers balance absolute accuracy against board area.
Typical applications include multiphase motor control (simultaneous current and voltage sampling), power-grid synchronization and power-factor correction (three-phase voltage and current monitoring), vibration and waveform analysis (multi-axis accelerometers), and industrial data acquisition requiring coherent sampling across channels. The 5 V analog supply and ±10 V input range directly interface with current transformers, shunts, and line-voltage transducers.
Design consideration: Place analog and digital grounds on split planes joined at a single point beneath the exposed pad of the LQFP-48. Use 0.1 µF ceramic decoupling on AVDD, DVDD, and AVDD2 pins; decoupling value and topology should follow the manufacturer datasheet reference schematic.
This page consolidates distributor pricing, drop-in alternatives, and layout guidance not always present in the manufacturer datasheet, giving procurement and design engineers a single reference for evaluation, second-sourcing, and PCB integration.
Alternativas drop-in para MAX1321ECM+ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MAX1321ECM+ (mesmo formato e footprint) — diferindo em Package, Number of Channels, Resolution, Analog Supply Voltage, Digital Interface.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX1322ECM+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1320ECM+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1318ECM+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1316ECM+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1319ECM+
✅ Drop-In✓ Em estoque
$7.2 / unidade
Ver ficha técnica →MAX1324ECM+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1321ECM+ Classificações máximas e características elétricas
| Resolução | 14 bit |
| Number of Channels | 4 (simultaneous sampling; also supports 2/8 channel modes in family) |
| Conversion Type | SAR (Successive Approximation) |
| Maximum Throughput | 357 ksps aggregate |
| Analog Input Range | ±10 V, ±5 V, or 0 to +5 V (software-selectable, true differential) |
| Input Over-Voltage Protection | ±25 V |
| Reference | Internal 2.5 V or external |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible, up to 20 MHz |
| Conversion-Complete Output | RDY/INT pin |
| Faixa de temperatura de operação | Industrial, -40C to +85C |
| Encapsulamento | 48-LQFP (7x7 mm) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
Guia de Configuração de Pinos do MAX1321ECM+ 48-lqfp (7x7 mm)
Configuração de pinos para MAX1321ECM+ (pacote 48-lqfp (7x7 mm)). Este componente analógico possui pinos de entrada, saída e alimentação. Consulte o datasheet do fabricante para configurações de offset null, compensação e pino de enable. Ideal para circuitos de condicionamento de sinal e amplificadores.
Nenhum dado detalhado de pinagem disponível para MAX1321ECM+.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
MAX1321ECM+ é adequado para 6 aplicaçãos: Multiphase Motor Control, Power-Factor Correction and Power-Grid Synchronization, Vibration and Waveform Analysis, Industrial Data Acquisition Systems, Battery Cell Monitoring and Management, Audio and Acoustic Test Equipment.
Multiphase Motor Control
The MAX1321ECM+ is a strong fit for three-phase motor control because it provides four true-differential input channels that sample all phase currents and the DC-bus voltage simultaneously through per-channel track-and-hold amplifiers, eliminating skew that would otherwise produce field-weakening errors at higher PWM duty cycles. With ±10 V true-differential inputs and ±25 V over-voltage protection, the ADC connects directly to current-shunt amplifiers and DC-link resistor dividers without external scaling. Used between the gate-driver sense resistors and the MCU's SPI port, the 357 ksps throughput supports PWM frequencies well above 20 kHz while the 14-bit resolution delivers the dynamic range needed for torque-ripple minimization and field-oriented control loops. The drawback vs the faster MAX1322ECM+ is that 357 ksps is best suited to industrial inverter PWM rates below ~50 kHz rather than ultra-high-speed servo drives.
Recomendado
Power-Factor Correction and Power-Grid Synchronization
Three-phase power-quality monitoring requires that voltage and current on each leg be captured in the same instant so that phase-angle relationships are preserved, which is the primary reason the MAX1321ECM+ matches this application. Its 4-channel simultaneous sampling, software-selectable ±10 V/±5 V/0-5 V inputs, and internal 2.5 V reference let designers connect line-voltage transducers and current transformers without external signal conditioning. At 357 ksps aggregate, the part samples at more than 7 ksps per channel at the typical 14.4 ksps (720 samples/cycle @ 50 Hz) required for Class-A power meters. Unlike sigma-delta ADCs that need settling time, the SAR architecture delivers a single-snapshot conversion that simplifies FFT-based harmonic analysis of the grid signal.
Recomendado
Vibration and Waveform Analysis
Two- or three-axis MEMS accelerometer arrays benefit from the MAX1321ECM+'s simultaneous-sampling architecture because the part captures all axes at one instant, preserving the cross-axis correlation needed for modal-analysis and shock-vector reconstruction. With ±10 V input range and 14-bit resolution the ADC handles piezo-sensor outputs through charge amplifiers and IEPE conditioning chains without further attenuation. The 357 ksps throughput supports 50+ kHz sampling per channel for vibration-bandwidth analysis on turbomachinery and structural-health monitoring. Compared with multiplexed ADCs that introduce inter-channel skew of one conversion cycle, the MAX1321ECM+'s per-channel T/H front-end keeps skew well below 10 ns, which is critical for beamforming and modal-extraction algorithms.
Recomendado
Industrial Data Acquisition Systems
Distributed I/O modules and process-control front-ends use the MAX1321ECM+ to digitize multiple 4-20 mA or ±10 V transducer loops simultaneously with a single device, reducing the per-channel BOM cost relative to a stack of single-channel ADCs. The SPI-compatible digital interface lets the part hang directly off an MCU or industrial Ethernet controller without glue logic, and the 48-LQFP surface-mount package accommodates hand-rework during prototyping. Its ±25 V input protection allows direct termination of industrial field wiring without external TVS diodes in many applications, while the software-selectable input range lets one board design serve ±10 V, ±5 V, and unipolar 0-5 V transducer families by register setting alone.
Recomendado
Battery Cell Monitoring and Management
The MAX1321ECM+ suits multi-cell battery stacks because its 4-channel simultaneous-sampling inputs let a single IC scan four series cells at the same instant, eliminating measurement skew that would cause balancing algorithms to misjudge state-of-charge. The ±5 V or ±10 V input ranges cover typical 4.2 V Li-ion cells when used in true-differential mode, and the internal 2.5 V reference removes the need for a separate precision reference per cell tap. Operated near a BMS controller through SPI, the 357 ksps throughput is sufficient to refresh all four cells within hundreds of microseconds, supporting aggressive cell-balancing scheduling. The trade-off vs dedicated battery monitor ICs is the absence of integrated cell-balancing FETs, so the MAX1321ECM+ pairs with an external balance-MOSFET driver for production designs.
Recomendado
Audio and Acoustic Test Equipment
Multi-microphone acoustic-test rigs such as beamforming arrays and noise-source localization benches benefit from the MAX1321ECM+'s simultaneous capture because phase relationships between microphone channels must be preserved to within nanoseconds for accurate direction-of-arrival estimation. The 14-bit resolution and ±10 V input range accommodate standard microphone preamp outputs at +20 dBu levels with 10 dB of headroom, while the SPI-compatible interface streams four channels of audio data to a DSP or FPGA at sufficient aggregate rate to cover the full 20 kHz audio band per channel. Versus high-resolution sigma-delta audio ADCs, the SAR architecture provides a single-snapshot acquisition that avoids the group-delay artifacts of decimation filters, which is important when correlating against reference microphones.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX1321ECM+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX1322ECM+ | MAX1320ECM+ | MAX1318ECM+ | MAX1316ECM+ |
|---|---|---|---|---|---|
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Package | 48-LQFP (7x7) | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Number of Channels | 4 | 4 | 2 | 8 | 6 |
| Maximum Throughput | 357 ksps | 1.4 Msps | 357 ksps | 357 ksps | 357 ksps |
| Input Range | ±10 V / ±5 V / 0 to +5 V | ±10 V / ±5 V / 0 to +5 V | ±10 V / ±5 V / 0 to +5 V | ±10 V / ±5 V / 0 to +5 V | ±10 V / ±5 V / 0 to +5 V |
| Conversion Architecture | SAR | SAR | SAR | SAR | SAR |
| Digital Interface | SPI/QSPI/MICROWIRE up to 20 MHz | SPI/QSPI/MICROWIRE up to 20 MHz | SPI/QSPI/MICROWIRE up to 20 MHz | SPI/QSPI/MICROWIRE up to 20 MHz | SPI/QSPI/MICROWIRE up to 20 MHz |
| Over-Voltage Protection | ±25 V | ±25 V | ±25 V | ±25 V | ±25 V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Principais diferenciais
- True ±10 V differential inputs without external dividers (vs MAX1322ECM+)
- 4 channels for typical 3-phase + DC-bus sensing (vs MAX1320ECM+)
- Per-channel track-and-hold enables simultaneous sampling (vs MAX1318ECM+ (8-channel variant))
Notas de projeto
Place 0.1 µF ceramic decoupling capacitors as close as possible to each AVDD and DVDD pin, with a 10 µF bulk cap at the regulator output supplying the analog plane. Split the ground plane into analog (AGND) and digital (DGND) sections joined at a single point beneath the exposed thermal pad of the 48-LQFP. Estimated: a properly implemented split-plane layout typically reduces ADC noise by 6-10 dB versus a unified ground; the exact number is layout-dependent and should be measured on the prototype.
Per the MAX1321 datasheet reference schematic, the exposed thermal pad on the 48-LQFP must be soldered to the AGND plane to meet the package thermal performance and to provide a stable reference for the analog inputs. Recommended land pattern is provided in the datasheet mechanical drawing. Use a 4-mil soldermask-dam fence around thermal vias if higher reliability is required.
Avoid routing the SPI clock and data lines across or adjacent to the analog input traces; the digital SPI transitions can couple into the high-impedance analog inputs and degrade AC performance. Adding a digital-isolation barrier (such as a 74HC125 buffer or digital isolator) between the MCU and the ADC interface when the MCU and ADC are on different ground potentials prevents ground-loop noise injection. Always verify that CS, SCLK, and DIN are within the datasheet-specified logic thresholds for the chosen DVDD level (typically 2.7 V or 5 V operation).
For ±10 V true-differential inputs, keep the AIN+ and AIN- traces as a length-matched, tightly coupled pair from the input protection network to the IC pins; mismatched impedance causes common-mode-to-differential conversion that reduces the effective 14-bit resolution. Series input resistors (~100 Ω) plus a 1 nF to 10 nF common-mode filter capacitor to AGND attenuate RF pickup above the SAR's Nyquist frequency without materially affecting the input bandwidth.
Drive AVDD from a low-noise LDO (such as the MAX1321's own analog supply or a comparable ultra-low-noise part like TPS7A4701); the MAX1321's internal 2.5 V reference is sensitive to AVDD ripple above 1 mV. When using an external reference, buffer it with an op-amp to avoid reference-biasing errors when multiple devices share the reference rail.
Informações de conformidade
RoHS and lead-free compliance affirmed by Maxim Integrated/Analog Devices product page listings. AEC-Q100 qualification status not asserted in publicly available datasheet; treat as not_applicable for this part. Halogen-free and conflict-minerals status not explicitly listed in the captured data - set to unknown.
