MAX1119EKA-T - 8-Bit 100ksps 2-Ch SAR ADC, SOT-23-8 | Maxim
N.º da peça: MAX1119EKA-T ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.56 | $25,60 |
| 100 | $2.21 | $221,00 |
| 500 | $1.92 | $960,00 |
| 1.000 | $1.74 | $1.740,00 |
MAX1119EKA-T Visão geral
A successive-approximation register (SAR) ADC is a type of data converter that performs a binary search on the input voltage using an internal comparator and digital-to-analog converter (DAC). SAR ADCs are valued for their deterministic latency, low power, and excellent behavior around DC inputs, making them a common choice for multiplexed sensor reading, industrial control loops, and battery monitoring where switching-regulator noise from delta-sigma or pipelined converters is undesirable. The MAX1119 sits in the broader hierarchy: ADC -> data converter -> data acquisition IC -> signal chain -> mixed-signal semiconductor.
Key differentiating features include the industry's lowest power consumption among 8-bit SAR ADCs in this package (135 µA at 100 ksps), an internal 4.096 V reference that simplifies external BOM, automatic power-down between conversions, and a true 2-channel single-ended input mux. The internal track/hold operates up to 100 kHz input bandwidth, and the SPI/QSPI/MICROWIRE-compatible serial interface connects directly to most embedded microcontrollers without glue logic.
Architecturally, the MAX1119 uses a capacitive-charge-distribution SAR core with an on-chip bandgap-derived reference buffer. The BiCMOS process enables low active current while still supporting 100 ksps conversion rates, and the automatic shutdown between conversions drops quiescent current to sub-µA levels for battery-powered duty-cycled sampling.
Typical applications include portable data logging, 4-20 mA loop sensor digitization, HVAC thermistor reading, battery fuel gauging, and panel-meter front-ends. The wide supply range and small SOT-23 footprint also suit space-constrained industrial instrumentation. When designing with this part, place the 0.1 µF VDD bypass capacitor within 5 mm of the supply pin and ensure CS, SCLK, and DOUT traces are kept short to avoid digital coupling into the analog inputs. This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the bare manufacturer datasheet.
Alternativas drop-in para MAX1119EKA-T — 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 MAX1119EKA-T (mesmo formato e footprint) — diferindo em Package, Resolution, Operating Temperature, Number of Channels, Sampling Rate.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX1119EKA+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1118EKA+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1117EKA+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1116EKA+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX11120ATI+T
✅ Drop-In✓ Em estoque
$3.18 / unidade
Ver ficha técnica →MAX11163ETB+T
✅ Drop-In✓ Em estoque
$4.62 / unidade
Ver ficha técnica →MAX1119EKA-T Classificações máximas e características elétricas
| Resolução | 8 bit |
| Number of Channels | 2 (single-ended) |
| Taxa de amostragem | 100 ksps |
| ADC Architecture | SAR (Successive Approximation) |
| Supply Voltage (Analog) | 4.5 V to 5.5 V |
| Supply Voltage (Digital) | 5 V |
| Supply Current at 100 ksps | 135 µA (typ) |
| Internal Reference Voltage | +4.096 V |
| Reference Type | Internal (MAX1119) |
| Input Bandwidth (Track/Hold) | 100 kHz |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Input Type | Single-ended |
| Temperatura de operação | -40 °C to +85 °C |
| Encapsulamento | SOT-23-8 |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Lead-Free | Yes |
Configuração de pinos do MAX1119EKA-T
| Pino 1 | AIN0 — Analog input channel 0 |
| Pino 2 | AIN1 — Analog input channel 1 |
| Pino 3 | GND — Ground |
| Pino 4 | DOUT — Serial data output (SPI/QSPI/MICROWIRE) |
| Pino 5 | SCLK — Serial clock input |
| Pino 6 | CS — Chip select (active low) |
| Pino 7 | VDD — Power supply (+4.5 V to +5.5 V) |
| Pino 8 | REF — Reference voltage (internal 4.096 V) |
Aplicações típicas
MAX1119EKA-T é adequado para 6 aplicaçãos: Portable Battery Data Logging, 4-20 mA Industrial Loop Sensor Digitization, HVAC Thermistor and Sensor Reading, Battery Fuel Gauging Front-End, Panel Meter and Digital Readout, Embedded Sensor Hub for IoT Nodes.
Portable Battery Data Logging
The MAX1119EKA-T fits portable battery-powered data loggers because its 135 µA active current at 100 ksps and sub-µA automatic shutdown between conversions extend battery life on duty-cycled sampling. Its 2-channel single-ended input multiplexes two sensors (e.g. thermistor plus battery voltage) into one ADC, while the internal +4.096 V reference avoids an extra reference IC. Placed near the battery with a 0.1 µF VDD bypass, it offers 8-bit resolution and deterministic SAR latency ideal for slow-changing physical signals, outperforming discrete op-amp + comparator designs in both BOM count and noise rejection.
Recomendado
4-20 mA Industrial Loop Sensor Digitization
The MAX1119EKA-T is well suited to digitize 4-20 mA current loops in industrial transmitters because its single +5 V supply matches loop-excitation rails and its 8-bit resolution is sufficient for panel-meter-grade readout. The internal track/hold settles in microseconds, sampling a 250 Ω sense resistor as a single-ended AINx input at 100 ksps. Its SAR core provides instantaneous conversion (no pipeline delay), critical for HART or polled sensor protocols, and the SPI interface connects directly to industrial MCUs. Across process and temperature, the MAX1119EKA-T delivers repeatable 8-bit performance with predictable INL.
Recomendado
HVAC Thermistor and Sensor Reading
The MAX1119EKA-T reads NTC thermistors and HVAC analog sensors because it offers two single-ended channels, an internal 4.096 V reference, and the SPI interface links directly to HVAC microcontrollers. Placed between the 5 V rail and the thermistor divider, it samples up to 100 ksps with deterministic latency, supressing mains-frequency noise when averaged across 50/60 Hz periods. Compared with discrete ADC implementations, the MAX1119EKA-T cuts BOM by two parts (no external reference, no op-amp buffer) and improves thermal stability across the -40 °C to +85 °C industrial range.
Recomendado
Battery Fuel Gauging Front-End
The MAX1119EKA-T serves as a fuel-gauge front-end for lithium-ion battery packs because its internal 4.096 V reference calibrates voltage and current measurements to a known scale, and its 8-bit resolution is sufficient for state-of-charge binning in single-cell packs. The two single-ended channels monitor pack voltage and current-sense amplifier output, while the SPI interface streams conversion results to a host MCU. The low 135 µA active current contributes negligibly to pack quiescent draw, and the automatic power-down drops standby current to sub-µA levels between samples.
Recomendado
Panel Meter and Digital Readout
The MAX1119EKA-T drives digital panel meters because its 100 ksps sample rate and 8-bit resolution are sufficient to display a 0-999 count readout with 1 LSB steps, and its internal reference eliminates the need for a precision external reference. The 2-channel input supports simultaneous display of two measurements (e.g. voltage and current). With 8 pins in SOT-23, the ADC consumes roughly 10 mm² of PCB area, an order of magnitude smaller than legacy discrete designs, and its SPI interface requires only three MCU pins.
Recomendado
Embedded Sensor Hub for IoT Nodes
The MAX1119EKA-T suits IoT sensor hubs because it provides 2 channels of 8-bit digitization in a tiny 8-pin SOT-23, drawing only 135 µA at full speed and sub-µA between conversions, which preserves battery life in duty-cycled IoT nodes. The internal 4.096 V reference removes an external component, and the SPI/QSPI/MICROWIRE-compatible interface connects directly to low-power MCUs such as the MAX32660. Across process and temperature, the MAX1119EKA-T maintains 8-bit accuracy suitable for light, sound, and gas sensor binning in industrial and smart-home applications.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX1119EKA-T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX1119EKA+T | MAX1118EKA+T | MAX1117EKA+T | MAX1116EKA+T | MAX11120ATI+T | MAX11163ETB+T |
|---|---|---|---|---|---|---|---|
| Package | SOT-23-8 | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same |
| Brand | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 12/14 bit | 12 bit |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V | 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 |
| Internal Reference | +4.096 V | +4.096 V | External only | +2.048 V | +2.048 V | +2.5 V | +2.5 V |
| Sampling Rate | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 200 ksps | 200 ksps |
| Channels | 2 single-ended | 2 single-ended | 2 single-ended | 2 single-ended | 2 single-ended | 2 single-ended | 1 differential/2 SE |
| Active Current at 100ksps | 135 µA | 135 µA | 135 µA | 135 µA | 135 µA | 100 µA | 100 µA |
Principais diferenciais
- Industry's lowest power 8-bit SAR in SOT-23-8 (vs MAX1119EKA+T)
- Internal +4.096 V reference matches 5 V full-scale exactly (vs MAX1118EKA+T)
- Pin-compatible upgrade path to 12/14-bit (vs MAX11120ATI+T)
Notas de projeto
Place a 0.1 µF ceramic bypass capacitor within 5 mm of the VDD pin and a 10 µF bulk capacitor near the supply rail. The MAX1119EKA-T draws 135 µA during active conversion and drops to sub-µA during automatic power-down; a high-frequency bypass prevents supply-rail droop that could couple into the analog inputs. For battery-powered designs, power-cycle VDD with a low-leakage load switch to extend shelf life.
Route the SPI lines (CS, SCLK, DOUT) on a separate layer or keep them away from the AINx traces; the SAR core can inject digital switching noise back into the analog inputs. Use a ground pour under the analog inputs and short direct returns to the GND pin (pin 3). Keep the trace length to AIN0/AIN1 less than 1/10 of the wavelength at 100 kHz to avoid capacitive kickback into the internal track/hold.
Do not connect an external reference to the REF pin when using the internal +4.096 V reference; the MAX1119's REF pin is an output, not an input, and forcing voltage on it can damage the part. If the application requires an external reference, choose the MAX1118 variant instead, which accepts an external reference in the 0 to VDD range. Also, ensure CS is held low for the full conversion cycle; premature CS release aborts the SAR bit-cycling.
Informações de conformidade
RoHS compliant per Maxim product markings; not AEC-Q100 qualified - select the MAX11120ATI+T family for automotive-grade applications.
