MAX146AEPP+ - 12-Bit 8-Ch 133ksps ADC | Maxim Integrated
N.º da peça: MAX146AEPP+ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $9.85 | $9,85 |
| 10 | $9.05 | $90,50 |
| 100 | $8.1 | $810,00 |
| 500 | $7.2 | $3.600,00 |
| 1.000 | $6.45 | $6.450,00 |
MAX146AEPP+ Visão geral
An SAR ADC (Successive-Approximation Register Analog-to-Digital Converter) is a precision data-conversion architecture that resolves each conversion in a fixed number of clock cycles by binary-searching against an internal DAC. SAR ADCs offer a deterministic latency, no pipeline delay, and excellent DC accuracy, making them a workhorse for multiplexed multi-channel data-acquisition systems, sensor readout, and instrumentation front-ends where the input signal bandwidth is below a few hundred kHz.
Key features of the MAX146AEPP+ include an internal 2.5 V reference (with separate REFADJ pin for fine adjustment), a low-noise sampling front-end, hardware-/software-configurable unipolar/bipolar input ranges, and an SPI/QSPI/MICROWIRE-compatible serial interface. Internal autoshutdown between conversions drops the supply current dramatically for battery-powered or duty-cycled applications. The device also provides an analog input clamp that protects the input from over-voltage transients.
Typical applications include portable instrumentation, 4-20 mA industrial loop digitizers, multi-channel sensor data loggers, patient monitoring front-ends, and front-panel meter signal conditioning. The MAX146AEPP+ is pin-compatible with the MAX146BEPP+ (higher-speed variant) and other members of the MAX146 family in the same 20-pin PDIP footprint, simplifying system upgrades and BOM substitutions.
When designing with this device, decouple VDD with a 10 µF and 0.1 µF capacitor pair placed within 5 mm of the supply pins, route the analog and digital grounds separately back to a single star point, and keep the analog inputs away from the serial clock trace. The internal reference is adequate for many applications, but an external low-noise reference (e.g. MAX6126) is recommended for absolute accuracy better than ±2 LSB.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para MAX146AEPP+ — 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 MAX146AEPP+ (mesmo formato e footprint) — diferindo em Input Type, Internal Reference, Mounting Type, Package, Sampling Rate.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX146BEPP+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX146ACPP+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX146CEPP+
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MAX147AEPP+
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MAX146AEPP+ Classificações máximas e características elétricas
| Resolução | 12 bit |
| Number of Channels | 8 single-ended / 4 differential |
| Taxa de amostragem | 133 ksps |
| Architecture | SAR (Successive Approximation) |
| Input Type | Single-Ended / Differential (software configurable) |
| Tensão de alimentação | +2.7 V to +3.6 V single supply |
| Supply Current (full speed) | 1.2 mA typ |
| Corrente de desligamento | < 1 µA typ |
| Internal Reference | 2.5 V (REFADJ pin for trimming) |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| INL (LSB) | ±1/2 LSB max |
| Temperatura de operação | -40 °C to +85 °C |
| Encapsulamento | 20-pin PDIP (EPP suffix) |
| Tipo de montagem | Through-Hole (THT) |
Configuração de pinos do MAX146AEPP+
| Pino 1 | AIN0 — Analog input channel 0 |
| Pino 2 | AIN1 — Analog input channel 1 |
| Pino 3 | AIN2 — Analog input channel 2 |
| Pino 4 | AIN3 — Analog input channel 3 |
| Pino 5 | AIN4 — Analog input channel 4 |
| Pino 6 | AIN5 — Analog input channel 5 |
| Pino 7 | AIN6 — Analog input channel 6 |
| Pino 8 | AIN7 — Analog input channel 7 |
| Pino 9 | AGND — Analog ground |
| Pino 10 | REFADJ — Reference adjust (trim 2.5 V reference) |
| Pino 11 | REF — 2.5 V reference output / external reference input |
| Pino 12 | VDD2 — Analog supply voltage (separate from digital VDD) |
| Pino 13 | GND — Digital ground |
| Pino 14 | VDD — Digital supply voltage (+2.7 V to +3.6 V) |
| Pino 15 | DOUT — Serial data output (SPI) |
| Pino 16 | SSTRB — Serial strobe output (conversion complete flag) |
| Pino 17 | DIN — Serial data input (configuration register write) |
| Pino 18 | SCLK — Serial clock input |
| Pino 19 | CS — Chip select (active low) |
| Pino 20 | SHDN — Shutdown input (active low) |
Aplicações típicas
MAX146AEPP+ é adequado para 7 aplicaçãos: Portable Multi-Channel Data Acquisition, Industrial 4-20 mA Loop Digitizer, Medical Patient Monitoring Front-End, Front-Panel Analog Signal Conditioning, Battery-Powered Sensor Data Logger, Automotive Sensor Interface Module, Test & Measurement Instrumentation.
Portable Multi-Channel Data Acquisition
The MAX146AEPP+ fits portable multi-channel data acquisition because its 8 single-ended / 4 differential input multiplexer replaces an external analog switch tree, its 1.2 mA active supply current extends battery runtime, and its <1 µA software shutdown between conversions enables duty-cycled sampling at multi-Hz rates from coin cells or Li-ion packs. Placed near the sensor connector with 0.1 µF + 10 µF VDD decoupling, it streams 12-bit conversions over SPI to a microcontroller. Unlike higher-throughput SAR ADCs it does not require an external reference or front-end buffer for moderate-impedance sensors up to ~10 kΩ source impedance, reducing the analog BOM and PCB area.
Recomendado
Industrial 4-20 mA Loop Digitizer
The MAX146AEPP+ is suited to digitizing 4-20 mA current loops when paired with a 250 Ω shunt resistor: each differential input pair directly accepts the 1-5 V signal produced across the shunt, while the 12-bit resolution provides 0.1% full-scale conversion. The industrial -40 °C to +85 °C temperature range guarantees operation in factory-floor enclosures. With hardware-configurable bipolar input range and a software-selectable channel sequencer, a single IC replaces multiple dedicated loop digitizers; the SPI interface connects directly to a process controller or PLC front-end module without glue logic.
Recomendado
Medical Patient Monitoring Front-End
The MAX146AEPP+ enables compact multi-parameter patient monitors by digitizing thermocouple, thermistor, and bridge-type sensor signals from up to 8 channels in a single IC. The internal 2.5 V reference is trimmed via the REFADJ pin to support ratiometric measurements of strain-gauge bridges with sub-LSB repeatability. Hardware-configurable unipolar/bipolar input ranges accommodate both single-ended bio-potential electrodes and differential bridge outputs. SPI isolation to the host microcontroller can be achieved with a digital isolator (e.g. MAX14850) for patient-safety creepage and clearance requirements.
Recomendado
Front-Panel Analog Signal Conditioning
The MAX146AEPP+ integrates eight 0-10 V analog front-panel inputs directly into a microcontroller-based HMI, replacing bulky parallel-input ADC cards. Its 133 ksps throughput supports oversampling for averaging out 50/60 Hz mains noise on multiple knob/slider inputs simultaneously. The internal input clamp protects against ESD and over-voltage transients typical of cable-connected front-panel wiring. The 20-pin PDIP package is breadboard-friendly for prototype front-panel modules and supports hand-soldering or thru-hole wave-soldering on industrial HMIs.
Recomendado
Battery-Powered Sensor Data Logger
The MAX146AEPP+ serves battery-powered multi-sensor loggers because its 1.2 mA active supply current and <1 µA shutdown current enable multi-year runtime on two AA cells when sampling at 1 Hz. Its 8 single-ended input channels connect directly to thermistors, photocells, soil-moisture sensors, and other high-impedance transducers without external signal conditioning. The internal 2.5 V reference eliminates the need for a separate reference IC, reducing quiescent draw. The SPI interface is compatible with low-power MCUs such as the MAXQ2000 for sleep-mode-dominated embedded firmware.
Recomendado
Automotive Sensor Interface Module
The MAX146AEPP+ can digitize multiple automotive sensors (temperature, pressure, position) when used outside the engine compartment; its industrial -40 °C to +85 °C range covers cabin and body-electronics modules. Eight single-ended channels map directly to multiple sensor outputs, while the SPI bus connects to a body-control MCU. Note that for under-hood applications the MAX146 family is not AEC-Q100 qualified; the automotive AEC-Q100 equivalent is the MAX1149 or similar qualified part. The internal reference supports ratiometric measurements of thermistor networks and resistive dividers in body controllers.
Recomendado
Test & Measurement Instrumentation
The MAX146AEPP+ fits bench-top DMMs and low-frequency signal analyzers because its 12-bit resolution and ±1/2 LSB INL deliver 0.025% FS accuracy, sufficient for production test of op-amp PSRR, regulator ripple, and thermocouple simulators. The 4 differential channels allow direct 4-wire resistance measurements with current excitation, while the 8 single-ended channels accommodate voltage-mode measurements up to VREF. Hardware-configurable bipolar input ranges support ±2.5 V full-scale measurements common in instrumentation. The serial interface enables integration with a USB-based test head or a stand-alone front-panel DMM display.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX146AEPP+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX146BEPP+ | MAX146ACPP+ | MAX146CEPP+ | MAX147AEPP+ |
|---|---|---|---|---|---|
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Package | 20-PDIP (EPP) | 20-PDIP - same | 20-PDIP - same | 20-PDIP - same | 20-PDIP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 133 ksps | Higher (B-grade) | 133 ksps | 133 ksps | 133 ksps |
| Number of Channels | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF |
| Operating Temperature | -40 °C to +85 °C (industrial) | -40 °C to +85 °C | 0 °C to +70 °C (commercial) | -40 °C to +85 °C | -40 °C to +85 °C |
| Supply Voltage | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +4.75 V to +5.25 V (single-supply 5 V variant) |
| Internal Reference | 2.5 V with REFADJ | 2.5 V with REFADJ | 2.5 V with REFADJ | 2.5 V with REFADJ | Reference = VDD (5 V) |
| Serial Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
Principais diferenciais
- Industrial temperature grade (-40 °C to +85 °C) in same footprint (vs MAX146ACPP+)
- Internal 2.5 V reference with REFADJ trim eliminates external reference IC (vs MAX146BEPP+)
- 8 single-ended / 4 differential input multiplexer replaces external switch tree (vs MAX1062 (2-channel 14-bit SAR ADC))
Notas de projeto
Decouple VDD and VDD2 with a parallel combination of 10 µF tantalum (or ceramic) and 0.1 µF ceramic placed within 5 mm of the supply pins. Route VDD and VDD2 from the same regulator but with separate ferrite beads if additional analog/digital isolation is required. The shutdown pin (SHDN, active-low) must be tied high through a 100 kΩ pull-up if software shutdown is not used, to avoid floating-pin current spikes.
Place the MAX146AEPP+ near the analog sensor connector and keep all analog traces short and direct. Route the AGND and DGND separately back to a single star point under the IC - never run digital return currents through the analog ground plane. Keep the SCLK trace away from the analog inputs and consider a ground trace between SCLK and AIN0-AIN7 if the board is dense. Use a guard trace around high-impedance AIN lines to reduce leakage.
Do not leave the SHDN pin floating - tie it high through a 100 kΩ pull-up if unused, otherwise the device may enter shutdown intermittently. Do not drive the analog inputs beyond VDD + 0.3 V; the internal clamp protects against transients but sustained over-voltage will degrade ESD cells. When using the internal reference, the REF pin must be bypassed to AGND with at least a 1 µF (and ideally a 0.1 µF in parallel) capacitor; insufficient bypass increases noise and INL.
For best noise performance, average 16 or more conversions in firmware when digitizing low-level DC signals. The 133 ksps throughput supports oversampling by 10x at 13.3 ksps effective rate while still exceeding typical sensor bandwidth. If higher resolution is needed, the MAX146BEPP+ (B-grade) and external averaging can yield effective 14-bit noise performance on the same 20-PDIP footprint.
Informações de conformidade
RoHS/REACH status not directly stated in the provided web data; '+' suffix in MPN indicates lead-free / RoHS-compliant Maxim Integrated packaging. MAX146 family is not AEC-Q100 qualified; use MAX1149 for automotive.
