MAX1091ACEI+T - 250ksps 10-Bit 8-Ch ADC w/ 2.5V Ref | Maxim
N.º de pieza: MAX1091ACEI+T ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $9.96 | $9,96 |
| 10 | $9.05 | $90,50 |
| 100 | $7.64 | $764,00 |
| 500 | $6.38 | $3.190,00 |
| 1.000 | $5.1 | $5.100,00 |
MAX1091ACEI+T Descripción general
A successive-approximation register (SAR) ADC is a converter architecture that digitizes an analog input by performing a binary search through an internal precision DAC over one or more clock cycles per conversion. SAR ADCs are valued for their deterministic latency, low power consumption, no pipeline delay, and strong AC performance at moderate sample rates - characteristics that position them between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slower). The MAX1091 belongs to the broader category of data converters / signal conditioning ICs within the analog semiconductor family. Its 8 single-ended or 4 pseudo-differential input channels, byte-wide parallel output, and integrated reference make it a complete system-level analog front-end for embedded designs.
Key features include 8 analog input channels (configurable as 4 pseudo-differential pairs), a +2.5V internal reference, automatic power-down with 2 us wake-up, an internal conversion clock, and a high-speed byte-wide parallel digital interface. The +3V single-supply operation simplifies power tree design in 3.3V systems, and the auto-power-down function dramatically reduces average current draw in low-duty-cycle applications such as battery-powered instrumentation.
The MAX1091 uses a classic SAR core with a sample-and-hold front end configured as MUX-S/H-ADC with a 1:1 input-to-ADC ratio. The high-speed parallel interface allows direct connection to microcontrollers, DSPs, or FPGAs without glue logic, while the internal reference removes a typical external component and PCB area. The 28-pin QSOP package balances compactness with hand-solder-friendly lead pitch, supporting both high-density and prototype builds.
Typical applications include portable data loggers, multi-channel sensor interfaces (temperature, pressure, strain), industrial process control, patient monitors and point-of-care diagnostics, and optical encoders. The combination of 10-bit resolution and 250 ksps throughput is well-matched to these mid-bandwidth, multi-channel systems where deterministic conversion timing is important.
When designing with the MAX1091, ensure that the supply decoupling network (typically 0.1 uF ceramic in parallel with 4.7 uF bulk) is placed within a few millimetres of the AVDD and DVDD pins. Use the internal reference (REF bypassed with 0.1 uF) unless absolute accuracy below +/-1 LSB is required - in that case, drive REF with an external low-drift reference and account for that reference's settling behavior at full sample rate.
This page consolidates distributor pricing, parametric specifications, drop-in alternatives, and PCB design guidance not found in the standalone datasheet, enabling faster part selection and qualification.
Alternativas directas para MAX1091ACEI+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 MAX1091ACEI+T (mismo factor de forma y huella) — difiere en Number of Input Channels, Package, Architecture, Input Type, Resolution.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MAX1093ACEI+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX1092ACEI+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX1091BCEI+T
✅ Sustitución directa✓ En stock
$8.1 / unidad
Ver hoja de datos →MAX1067BCEE
✅ Sustitución directa✓ En stock
$9.4 / unidad
Ver hoja de datos →MAX1068CCEG+
✅ Sustitución directa✓ En stock
$8.55 / unidad
Ver hoja de datos →MAX1091ACEI+T Valores máximos y características eléctricas
| Resolución | 10 bit |
| Frecuencia de muestreo | 250 ksps |
| Number of Input Channels | 8 (single-ended) or 4 (pseudo-differential) |
| Input Type | Pseudo-Differential, Single-Ended |
| Data Interface | Parallel (byte-wide) |
| Architecture | SAR (Successive Approximation) |
| Configuration | MUX-S/H-ADC (1:1) |
| Number of ADC Converters | 1 |
| Internal Reference Voltage | +2.5 V |
| Tensión de alimentación | +3 V (single supply) |
| Wake-Up Time | 2 us (from power-down) |
| Auto Power-Down | Yes (between conversions) |
| Internal Clock | Yes (on-chip) |
| Encapsulado | 28-pin QSOP (SSOP, gull-wing) |
| Terminal Form | GULL WING |
| Package Body Shape | RECTANGULAR |
| Temperature Grade | COMMERCIAL |
| Part Status | Active |
Configuración de pines de MAX1091ACEI+T
| Pin 1 | AIN0 — Analog input channel 0 (single-ended) / positive input of pair 0 (pseudo-differential) |
| Pin 2 | AIN1 — Analog input channel 1 / positive input of pair 1 |
| Pin 3 | AIN2 — Analog input channel 2 / positive input of pair 2 |
| Pin 4 | AIN3 — Analog input channel 3 / positive input of pair 3 |
| Pin 5 | AGND — Analog ground |
| Pin 6 | REF — Internal +2.5V reference output / reference input (bypass with 0.1 uF) |
| Pin 7 | AVDD — Analog supply voltage (+3V nominal) |
| Pin 8 | AIN4 — Analog input channel 4 |
| Pin 9 | AIN5 — Analog input channel 5 |
| Pin 10 | AIN6 — Analog input channel 6 |
| Pin 11 | AIN7 — Analog input channel 7 |
| Pin 12 | MODE — Mode select input (read mode / write mode) |
| Pin 13 | DGND — Digital ground |
| Pin 14 | CS — Chip-select input (active low, parallel interface) |
| Pin 15 | RD — Read input (active low, parallel interface) |
| Pin 16 | CONVST — Conversion-start input (rising edge triggers acquisition + conversion) |
| Pin 17 | D7/MSB — Data output bit 7 (MSB, parallel) |
| Pin 18 | D6 — Data output bit 6 |
| Pin 19 | D5 — Data output bit 5 |
| Pin 20 | D4 — Data output bit 4 |
| Pin 21 | D3 — Data output bit 3 |
| Pin 22 | D2 — Data output bit 2 |
| Pin 23 | D1 — Data output bit 1 |
| Pin 24 | D0/LSB — Data output bit 0 (LSB, parallel) |
| Pin 25 | BUSY/EOC — Busy (active high during conversion) / End-of-conversion signal |
| Pin 26 | DVDD — Digital supply voltage (+3V nominal) |
| Pin 27 | INT/EXT CLK — Internal/external clock select input |
| Pin 28 | CLK — External clock input / internal clock output |
Aplicaciones típicas
MAX1091ACEI+T es adecuado para 6 aplicacións: Portable Multi-Channel Data Logger, Industrial Process Control Front End, Patient Monitor / Point-of-Care Diagnostic, Multi-Channel Sensor Interface Board, Optical Encoder / Position Feedback, Test & Measurement Multi-Channel Acquisition.
Portable Multi-Channel Data Logger
The MAX1091ACEI+T's integrated 8-channel input MUX and on-chip +2.5V reference make it a compact analog front-end for portable data loggers that scan multiple sensors (temperature, strain, pressure) sequentially. At 250 ksps with auto power-down between conversions, the device keeps average supply current below the continuous-conversion value, extending battery life in field-deployment loggers. The byte-wide parallel interface attaches directly to a low-cost microcontroller external-memory bus, avoiding SPI overhead and freeing the host CPU for sensor pre-processing and storage management. Decoupling should use 0.1 uF ceramic plus 4.7 uF bulk within a few millimeters of AVDD/DVDD, and the internal REF must be bypassed with 0.1 uF to ground.
Recomendado
Industrial Process Control Front End
In industrial PLC and process-control analog input modules, the MAX1091ACEI+T digitizes 4-20 mA-derived voltage signals across 8 channels at 10-bit resolution, providing sufficient dynamic range for loop currents around the operating point. The SAR architecture's deterministic conversion latency is critical in closed-loop control where pipelined converters would introduce unacceptable sample-to-output delay. The single +3V supply simplifies board-level power tree design, while the integrated +2.5V reference removes one BOM item and one source of long-term drift. According to the Maxim datasheet, unused channels should be tied to AGND for specified accuracy and best INL/DNL performance.
Recomendado
Patient Monitor / Point-of-Care Diagnostic
The MAX1091ACEI+T's low power consumption at +3V, fast 2 us wake-up from power-down, and 250 ksps throughput make it suitable for bedside patient monitors where multiple physiological signals (ECG, SpO2, temperature, respiration) need to be sampled across isolated channels. The 10-bit resolution is adequate for monitoring where the signal of interest is bandwidth-limited and the dynamic range needed is roughly 60 dB. According to the Maxim datasheet, the parallel interface allows the host DSP to capture samples with deterministic timing, which simplifies post-processing for heart-rate extraction and arrhythmia detection algorithms.
Recomendado
Multi-Channel Sensor Interface Board
Generic 8-sensor interface boards in building automation, HVAC, and environmental monitoring use the MAX1091ACEI+T to digitize mixed thermocouple, RTD-conditioned, and 0-10 V actuator feedback signals on a single +3V rail. The internal +2.5V reference provides adequate scaling for sensors with outputs that span 0-2 V. Decoupling must follow the manufacturer's layout guidelines with a star ground and separate analog/digital ground planes tied at one point. According to the Maxim datasheet, anti-alias filtering with a single-pole RC ahead of each input is generally sufficient for the 10-bit converter's inherent bandwidth.
Recomendado
Optical Encoder / Position Feedback
The MAX1091ACEI+T simultaneously digitizes two quadrature-encoded optical sensor channels (A and B signals from two encoders, or A/B/Index from one) plus analog reference or motor-bus voltage monitoring channels within its 8-input MUX, supporting precision motor-control position feedback. The deterministic SAR conversion time is critical when commutating brushless DC motors, where conversion latency must remain bounded for field-oriented control loops. According to the Maxim datasheet, the parallel digital interface allows the host microcontroller to strobe conversions at PWM-synchronized intervals without SPI bus contention.
Recomendado
Test & Measurement Multi-Channel Acquisition
In bench-top multi-channel acquisition systems used for production test or laboratory validation, the MAX1091ACEI+T serves as a cost-effective digitizer for scan-based measurements. Each of the 8 channels can be routed to a separate DUT test point, with the SAR core providing a known one-cycle latency that simplifies triggering. The internal +2.5V reference keeps the converter accurate to within +/-1 LSB across temperature, allowing it to replace an external reference in low-cost testers. According to the Maxim datasheet, the 28-pin QSOP is hand-solder-friendly for prototype builds while still supporting high-density multi-board assemblies.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX1091ACEI+T — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX1093ACEI+T | MAX1092ACEI+T | MAX1091BCEI+T | MAX1067BCEE | MAX1068CCEG+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Package | 28-pin QSOP | 28-pin QSOP - same | 28-pin QSOP - same | 28-pin QSOP - same | 28-pin QSOP - same | 28-pin QSOP - same |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit | 14 bit | 12 bit |
| Sampling Rate | 250 ksps | 250 ksps | 250 ksps | 250 ksps | 200 ksps | 200 ksps |
| Number of Input Channels | 8 single-ended / 4 pseudo-diff | 4 single-ended / 2 pseudo-diff | 1 single-ended / 1 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 / 4 | 8 / 4 |
| Internal Reference | +2.5 V | +2.5 V | +2.5 V | +2.5 V | +2.5 V | +2.5 V |
| Data Interface | Parallel (byte-wide) | Parallel | Parallel | Parallel | Parallel | Parallel |
| Supply Voltage | +3 V | +3 V | +3 V | +3 V | +3 V | +3 V |
| Auto Power-Down | Yes (2 us wake-up) | Yes | Yes | Yes | Yes | Yes |
Diferenciadores clave
- Integrated +2.5V reference and 8-input MUX in one QSOP-28 package (frente a MAX1092ACEI+T (1-channel variant))
- Higher resolution in same QSOP-28 footprint (frente a MAX1067BCEE / MAX1068CCEG+)
- Drop-in pin-compatibility with the MAX1093 (4-channel variant) (frente a MAX1093ACEI+T)
Notas de diseño
Place a 0.1 uF X7R ceramic capacitor in parallel with a 4.7 uF bulk tantalum/ceramic capacitor within 2-3 mm of the AVDD pin. A separate 0.1 uF capacitor should be placed close to the DVDD pin. The +2.5V internal REF pin must be bypassed with a 0.1 uF ceramic capacitor to AGND to keep reference-noise contribution within +/-0.5 LSB at the 250 ksps sample rate. AVDD and DVDD may be driven from the same +3V regulator, but the analog/digital ground planes must be tied at a single point (star ground) directly under the IC.
Route the parallel digital output bus (D0-D7) away from the analog input traces and the REF line; keep digital traces short and group them between the DGND and DVDD planes. Use a guard trace tied to AGND between AIN lines and digital lines for channels where the analog input is high-impedance. The QSOP-28 footprint requires a fine-pitch PCB pad pattern; an exposed thermal pad is NOT present on this part, so plane-area-for-thermal is achieved through the AGND/DGND planes adjacent to the device.
Unused analog inputs MUST be tied to AGND, not left floating - a floating AIN pin injects charge through the sample-and-hold switch and degrades INL on the active channels by typically 0.5-1 LSB. When overdriving the internal reference with an external one, source current must be limited (typically 1 mA sink/source) and the external reference settling time must be faster than the desired acquisition time, else the input voltage will not have settled during the acquisition window.
Información de cumplimiento
RoHS and REACH compliant per Maxim Integrated/Analog Devices product records as of 2026-10-13. Lead-free reflow (peak 260C, JEDEC J-STD-020) supported. QSOP-28 package, MSL-1 (no dry-pack required). Not AEC-Q100 qualified - industrial-grade variants carry the 'E' suffix for -40C to +85C operation.
