MAX1236EUA+CHV - 12-Bit 4-Ch I2C ADC, 8-µMAX
N.º da peça: MAX1236EUA+CHV ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.4 | $8,40 |
| 10 | $7.55 | $75,50 |
| 100 | $6.72 | $672,00 |
| 500 | $5.95 | $2.975,00 |
| 1.000 | $5.25 | $5.250,00 |
MAX1236EUA+CHV Visão geral
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that converts an analog input voltage into a digital code using a binary search algorithm against an internal precision DAC; it occupies the broader hierarchy of data converter -> ADC -> SAR ADC within signal chain semiconductors. SAR ADCs are valued for deterministic latency, low power consumption, and excellent DC accuracy, making them the dominant architecture for multiplexed multi-channel data acquisition in industrial control, instrumentation, and sensor readout subsystems where a single converter services many sensors sequentially.
Key features of the MAX1236 include a 4.096V internal reference (MAX1236 variant), a guaranteed 12-bit resolution with no-missing-codes performance, a maximum sampling rate of 94.4 kSPS (8 µs conversion + acquisition), true-differential inputs with software-configurable unipolar/bipolar ranges, and an I2C-compatible serial interface with user-selectable slave addresses. The internal 4.096V reference can be overdriven by an external reference between 1V and VDD for applications requiring absolute accuracy or ratiometric measurement.
The MAX1236 architecture combines a precision charge-redistribution DAC, an input track/hold that settles to 12 bits in less than 1.5 µs, and a digital comparator running the SAR search algorithm, all clocked from an internal 3 MHz oscillator. The high-impedance analog inputs can tolerate source impedances up to 1.5 kΩ without degrading linearity, and the digital section provides straight-binary (unipolar) or two's-complement (bipolar) output codes.
Typical applications include industrial sensor data acquisition (4-20 mA loop digitization via external resistor), battery-powered handheld instruments, portable medical monitors, PLC analog input modules, HVAC environmental sensors, and consumer audio VU-meter front-ends. The wide supply tolerance lets the same PCB design work at 3.3V or 5V rails without modification.
When designing with this device, allocate adequate PCB area for the analog input traces; keep them short and routed away from digital lines and clock edges. Use a single ground plane with the AGND and DGND pins tied together at the device to minimize return-path noise. Average 4 to 16 conversions in firmware to drop effective noise below 1 LSB.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design guidance for MAX1236EUA+CHV that complements the manufacturer datasheet.
Alternativas drop-in para MAX1236EUA+CHV — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX1236EUA+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1237EUA+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1236EUA+TCHV
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1136BEAP+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1236KEUA+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1236EUA+CHV Classificações máximas e características elétricas
| Resolução | 12 bits |
| Number of Input Channels | 4 single-ended / 2 differential (single-ended mode yields 8 inputs) |
| Architecture | SAR (Successive Approximation Register) |
| Supply Voltage (Low) | 2.7 V to 3.6 V |
| Supply Voltage (High) | 4.5 V to 5.5 V |
| Internal Reference | 4.096 V |
| External Reference Range | 1 V to VDD |
| Sampling Rate (max) | 94.4 kSPS |
| Conversion Time | 7.5 us (approximate) |
| Supply Current (max at 94.4 kSPS) | 670 uA |
| Input Type | Single-Ended / Differential (software configurable) |
| Interface | I2C-compatible 2-Wire Serial |
| Encapsulamento | 8-pin uMAX (uSOP) – MAX1236 variant |
| Temperatura de operação | -40 C to +85 C (extended) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Lead Free | Yes |
Configuração de pinos do MAX1236EUA+CHV
| Pino 1 | AIN0 — Analog input channel 0 (single-ended) or positive differential input (AIN0-AIN1 pair) |
| Pino 2 | AIN1 — Analog input channel 1 / REF (MAX1236 variant) |
| Pino 3 | AIN2 — Analog input channel 2 / COM (common) |
| Pino 4 | AIN3 — Analog input channel 3 / negative differential input |
| Pino 5 | SDA — I2C-compatible serial data (open-drain, requires pull-up) |
| Pino 6 | SCL — I2C-compatible serial clock input |
| Pino 7 | GND — Ground (return for both analog and digital sections) |
| Pino 8 | VDD — Power supply input (2.7V to 5.5V depending on mode) |
Aplicações típicas
MAX1236EUA+CHV é adequado para 7 aplicaçãos: Industrial 4-20 mA Sensor Data Acquisition, Battery-Powered Handheld Instruments, HVAC Environmental Sensor Hub, Medical Patient Monitor Analog Front End, Consumer Audio VU-Meter Front End, Rack-Mount Data Acquisition Module, Smart-Grid Energy Metering Front End.
Industrial 4-20 mA Sensor Data Acquisition
The MAX1236EUA+CHV is well matched to 4-20 mA current-loop digitisation in PLC analog-input modules. Its 4 single-ended channels correspond directly to four sensor channels per chip, the 4.096V internal reference yields an LSB of 1 mV with 12-bit resolution, and the I2C interface allows up to four MAX1236 devices on one bus for 16-channel modules via address straps. Place a 250 ohm precision shunt across AIN0–COM to convert 4-20 mA into a 1-5 V input range, then average 16 conversions in firmware to reach effective noise below 1 LSB for clean scaling into engineering units. Internal 670 uA active current and 1 uA shutdown enable loop-powered module designs.
Recomendado
Battery-Powered Handheld Instruments
For handheld multimeters, portable test gear, and field diagnostic tools the MAX1236EUA+CHV offers an optimal balance of low power, small footprint, and modest resolution. Active current of 670 uA at 94.4 kSPS and a sleep current of 1 uA let designers cycle the converter between conversions for multi-year battery life on a 2x AA cell stack. The 8-pin µMAX package fits within the tight PCB area typical of handheld enclosures, and the 2.7V minimum supply lets the device run directly from a discharged lithium coin cell down to its drop-out threshold. The internal track/hold eliminates the external sample capacitor that competing ADCs require, saving PCB space and BOM cost per channel.
Recomendado
HVAC Environmental Sensor Hub
In HVAC and building-automation sensor hubs that monitor temperature, humidity, CO2, and pressure, the MAX1236EUA+CHV provides four simultaneous analog-input channels with deterministic conversion latency. Its I2C interface allows direct attachment to common microcontrollers without dedicated SPI peripherals, simplifying firmware. The 4.096V internal reference is well matched to common 3.3V ratiometric sensors whose output spans 0-3.3V; overdrive REF with the sensor excitation supply for true ratiometric measurement to compensate for cable and reference drift. Operating from -40C to +85C it covers the commercial and industrial HVAC environment without derating.
Recomendado
Medical Patient Monitor Analog Front End
The MAX1236EUA+CHV suits medical patient monitors where four channels of low-speed analog data (temperature, SpO2 plethysmograph, respiration impedance, ECG auxiliary lead) must be digitised with deterministic latency and certified accuracy. Its SAR architecture provides no-latency-variation code-to-code, eliminating analog-derived glitches in alarm comparisons. The 4.096V reference enables 1 mV LSB scaling at 12 bits, sufficient for body-temperature and respiration signals. IEC 60601-1 compliant designs use the device's hardware power-down pin to disable conversions during defibrillator discharge recovery. Note: this is the ADC stage only; complete medical certification requires system-level qualification.
Recomendado
Consumer Audio VU-Meter Front End
For consumer-audio visualisers, VU meters, and peak-program meters, the MAX1236EUA+CHV delivers 12-bit envelope detection from up to four audio channels with 94.4 kSPS throughput fast enough to track percussive transients without aliasing. The differential input mode is well suited to bridged audio outputs where neither terminal is at ground; software-configurable bipolar range simplifies audio offset handling. With a 7.5 µs conversion time and small µMAX footprint, it fits into compact mixer-channel strips. Average multiple conversions per display update for smooth VU-ball damping, and use the hardware power-down pin to mute the channel indicator when the master fader is at zero.
Recomendado
Rack-Mount Data Acquisition Module
Rack-mounted data-acquisition modules and laboratory instrumentation benefit from the MAX1236EUA+CHV's I2C multi-drop capability, which allows stacking multiple boards without consuming additional host pins. Up to four MAX1236 devices share one I2C bus with distinct addresses, yielding 16 channels per host line - ideal for SPuDT-style expansion architectures. The 4.096V internal reference is calibrated at the factory so absolute accuracy is sufficient for general-purpose logging without further per-board trim. An external reference can override the internal one when per-channel calibration is required for traceable measurements, and the -40C to +85C operating range covers most lab and light-industrial enclosures without thermal compensation.
Recomendado
Smart-Grid Energy Metering Front End
In single-phase smart energy meters and load-monitoring gateways, the MAX1236EUA+CHV digitises four channels of current/voltage sense signals with deterministic latency. Differential input mode handles current-transformer secondary windings whose center-tap floats at high impedance, and the internal 4.096V reference avoids the cost of an external voltage reference chip for cost-sensitive meter designs. With a 670 uA active current and 1 uA sleep current the ADC contributes negligibly to standby power, which is critical for ENERGY STAR and IEC 62053 billing-meter standby budgets. Always pair with isolation barriers and CT burden resistors designed to your metrology class.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX1236EUA+CHV — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX1236EUA+ | MAX1237EUA+ | MAX1236EUA+TCHV | MAX1136BEAP+ | MAX1236KEUA+ |
|---|---|---|---|---|---|---|
| Package | 8-pin uMAX (uSOP) | 8-pin uMAX (uSOP) | 8-pin uMAX (uSOP) | 8-pin uMAX (uSOP) | 8-pin uMAX (uSOP) | 8-pin uMAX (uSOP) |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 10 bit | 12 bit |
| Internal Reference | 4.096 V | 4.096 V | 2.048 V | 4.096 V | 4.096 V | 4.096 V |
| Sampling Rate (max) | 94.4 kSPS | 94.4 kSPS | 94.4 kSPS | 94.4 kSPS | 94.4 kSPS | 94.4 kSPS |
| Number of Input Channels | 4 SE / 2 Diff | 4 SE / 2 Diff | 4 SE / 2 Diff | 4 SE / 2 Diff | 4 SE / 2 Diff | 4 SE / 2 Diff |
| Interface | I2C 2-Wire | I2C 2-Wire | I2C 2-Wire | I2C 2-Wire | I2C 2-Wire | I2C 2-Wire |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Supply Voltage Range | 2.7-3.6 V or 4.5-5.5 V | 2.7-3.6 V or 4.5-5.5 V | 2.7-3.6 V or 4.5-5.5 V | 2.7-3.6 V or 4.5-5.5 V | 2.7-3.6 V or 4.5-5.5 V | 2.7-3.6 V or 4.5-5.5 V |
Principais diferenciais
- Higher internal reference voltage (vs MAX1237EUA+)
- Same-family pin-compatible swap path (vs MAX1136BEAP+)
- Custom packaging suffix +CHV (vs MAX1236EUA+)
- True differential input option (vs Single-ended-only ADCs in similar package)
- Low power-down current (vs Competing ADCs without hardware shutdown pin)
Notas de projeto
Route analog input traces away from switching nodes (DC-DC converters, digital clocks) and keep them short. Use a star-ground topology: connect the device's GND pin to the system ground near the analog section, and provide a separate analog ground island only if the system has extreme switching currents near the ADC. Source impedance on AIN pins should be < 1.5 kΩ; for higher source impedances, add an external buffer amplifier to preserve acquisition time and linearity.
Estimated: at 5 V supply and 94.4 kSPS continuous conversion the MAX1236EUA+CHV draws 670 µA into VDD, dissipating roughly 3.35 mW internally. During sleep the current drops to ~1 µA, so a 1 sample/second duty cycle yields time-averaged supply current of ~(670 µA × 7.5 µs / 1 s) + 1 µA ≈ 6 µA. Place a 100 nF ceramic bypass and a 10 µF bulk capacitor within 5 mm of the VDD pin to suppress transient load steps on the supply rail.
Do not omit the I2C pull-up resistors on SDA and SCL; without them the bus will fail to release. Do not drive the I2C lines above VDD + 0.3 V; this violates the absolute-maximum rating even briefly. Use a setup time of at least 1.5 µs after conversion-start before clocking the I2C read; starting the read too soon returns stale data from the prior conversion. Check the address-select setup if multiple MAX1236 parts share one bus - factory defaults select one of two strap-pin-defined addresses, and you may need to ground or pull up the AIN0/AIN1 pins during reset to choose an address.
Informações de conformidade
RoHS compliance and lead-free finish per Maxim product page. AEC-Q100 not qualified - this is an industrial-grade part. Halogen-free status not explicitly stated in the verified web data; consult the manufacturer for confirmation.
