MAX1239LEEE+T - 12-Bit 12-Channel 2-Wire Serial ADC | Maxim Integrated
N.º da peça: MAX1239LEEE+T ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $9.42 | $9,42 |
| 10 | $8.49 | $84,90 |
| 100 | $7.05 | $705,00 |
| 500 | $6.21 | $3.105,00 |
| 1.000 | $5.18 | $5.180,00 |
| 2.500 | $4.62 | $11.550,00 |
MAX1239LEEE+T Visão geral
A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm against an internal DAC to digitize an analog input within N clock cycles (one per bit), achieving N-bit resolution with low latency and deterministic conversion time. SAR ADCs sit within the ADC family (successive-approximation, sigma-delta, pipeline, flash) under the data-converter hierarchy, which itself falls under data acquisition and finally signal-chain/mixed-signal ICs in the broader semiconductor taxonomy.
Key features of the MAX1239 include 12 input channels (with 6 channels configurable as differential pairs), an internal 2.5V or 4.096V reference (channel-dependent setting), automatic channel scanning, an on-chip FIFO, and software-configurable unipolar/bipolar inputs. The 2-wire interface supports standard (100 kHz), fast (400 kHz), and high-speed (1.7 MHz) modes, easing isolation across boards.
Architecturally, the device combines a capacitive-charge-distribution DAC with an internal track/hold, sample clock, and 4.096V reference. Internal reference trimming minimizes gain error, while factory calibration of the internal oscillator removes the need for an external crystal in most applications.
Typical uses include portable data loggers, battery-cell monitoring, panel-meter front-ends, industrial sensor multiplexing, and 4-20mA loop digitizers. The wide channel count is well matched to multi-sensor embedded systems where space and I/O count matter.
When designing, allocate sufficient settling time on high-impedance inputs (the part supports 0.3 µA bias, so source impedance must be limited) and follow Maxim's recommended analog input RC network to avoid conversion noise. Decouple AVDD with 10 µF + 0.1 µF ceramic capacitors placed within 5 mm of the supply pins.
This page synthesizes distributor pricing, drop-in same-package alternatives (different I2C address variants of MAX1236/MAX1237/MAX1238/MAX1239, plus the same family from Analog Devices) and practical design notes that go beyond a single datasheet table.
Alternativas drop-in para MAX1239LEEE+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 MAX1239LEEE+T (mesmo formato e footprint) — diferindo em Package, Resolution, Internal Reference, RoHS Status, Interface.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX1239KEEE+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1239MEEE+T
✅ Drop-In✓ Em estoque
$4.99 / unidade
Ver ficha técnica →MAX1237LEEE+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1238LEEE+T
✅ Drop-In✓ Em estoque
$5.1 / unidade
Ver ficha técnica →MAX1139MEEE+T
✅ Drop-In✓ Em estoque
$3.9 / unidade
Ver ficha técnica →MAX1237EUA+TGA8
✅ Drop-In✓ Em estoque
$6.85 / unidade
Ver ficha técnica →MAX1239LEEE+T Classificações máximas e características elétricas
| Resolução | 12 bit |
| Number of Input Channels | 12 (6 differential pairs) |
| Converter Type | SAR (Successive Approximation) |
| Taxa de amostragem | 94.4 ksps max |
| Tensão de alimentação | 2.7 V to 3.6 V (single supply) |
| Corrente de alimentação | 670 µA at 94.4 ksps |
| Interface | I2C-compatible 2-wire serial (Standard/Fast/High-Speed) |
| Internal Reference | 2.5 V (MAX1237) / 4.096 V (MAX1239 family) |
| Faixa de tensão de entrada | 0 to VREF (unipolar); ±VREF/2 (bipolar) |
| Integral Nonlinearity (INL) | ±1 LSB (max) |
| Differential Nonlinearity (DNL) | ±1 LSB (max, no missing codes) |
| Temperatura de operação | -40 °C to +85 °C (industrial, "E" suffix) |
| Encapsulamento | 16-pin QSOP |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Nível MSL | 1 (unlimited) |
Configuração de pinos do MAX1239LEEE+T
| 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 | AVDD — Analog supply voltage |
| Pino 10 | AGND — Analog ground |
| Pino 11 | AIN8 — Analog input channel 8 |
| Pino 12 | AIN9 — Analog input channel 9 |
| Pino 13 | AIN10 — Analog input channel 10 |
| Pino 14 | AIN11 — Analog input channel 11 |
| Pino 15 | SDA/DOUT — I2C serial data / serial data output |
| Pino 16 | SCL — I2C serial clock |
Aplicações típicas
MAX1239LEEE+T é adequado para 6 aplicaçãos: Battery-Pack Cell Monitoring, Industrial Sensor Multiplexing, Portable Data Loggers, 4-20 mA Loop Digitizers, Front Panels and HMIs, Medical Sensor Signal Acquisition.
Battery-Pack Cell Monitoring
The MAX1239LEEE+T fits battery-cell monitoring because 12 single-ended inputs cover a 6S cell stack plus six NTC thermistors, while the internal 4.096 V reference gives ~1 mV per LSB resolution at 12 bits - sufficient for accurate state-of-charge calculation on Li-ion or LiFePO4 packs. Sub-1 µA power-down current and 670 µA active supply current keep quiescent draw low during storage, and the I2C interface supports up to 1.7 MHz High-Speed mode for fast pack telemetry over isolation. Place 10 µF + 0.1 µF ceramic decoupling at AVDD and use a 1 kΩ + 10 nF RC on each AIN to limit input current transients during cell switching.
Recomendado
Industrial Sensor Multiplexing
The MAX1239LEEE+T suits industrial multi-sensor front-ends where 4-20 mA loops, thermistors, and bridge sensors share one PCB. Its 12 single-ended / 6 differential inputs let one part replace four external analog MUXes, reducing BOM and BOM-induced error. The internal 4.096 V reference trims to within ±1 LSB, supporting direct 0-5 V sensor scaling without external rail scaling. Use it with the datasheet-recommended 4.7 µF + 0.1 µF decoupling network and keep source impedance below ~2 kΩ for full 12-bit accuracy across the industrial -40 °C to +85 °C operating range.
Recomendado
Portable Data Loggers
The MAX1239LEEE+T is well matched to portable data loggers that sample environmental sensors (temperature, humidity, light, pressure) and need to minimize power between conversions. Active supply current is only 670 µA at 94.4 ksps and falls to sub-1 µA between scans, extending battery life over many days. The on-chip FIFO allows the host MCU to sleep while the ADC autonomously scans multiple channels, and the I2C High-Speed mode (1.7 MHz) reads a full 12-channel frame in well under 100 µs. Combine with a 16-QSOP land pattern for compact handheld form factors.
Recomendado
4-20 mA Loop Digitizers
The MAX1239LEEE+T digitizes 4-20 mA current loops when paired with a 250 Ω shunt resistor: a 20 mA signal becomes a 5 V full-scale input that maps directly to the MAX1239's 0 to 4.096 V analog input range with a small overhead. The internal reference trims gain error to within ±1 LSB, eliminating per-board calibration in most loops, and the 12-channel input lets one part handle multiple sensor loops on a process-control card. Use it as a drop-in across both 3.3 V and 5 V systems by selecting the MAX1239 (3.3 V) or MAX1238 (5 V) variant.
Recomendado
Front Panels and HMIs
The MAX1239LEEE+T provides multi-channel potentiometer/button scanning for front-panel HMIs where 12 channels of knob/button/LED feedback must be read at low latency. Its 94.4 ksps throughput and I2C High-Speed mode allow a 12-channel scan in under 100 µs, fast enough for sub-millisecond knob response with no perceptible lag. The 16-QSOP footprint fits in tight behind-the-panel layouts, and the industrial -40 °C to +85 °C rating handles factory and outdoor cabinet environments. The internal 4.096 V reference scales cleanly to 0-3.3 V sensor rails.
Recomendado
Medical Sensor Signal Acquisition
The MAX1239LEEE+T serves multi-parameter medical acquisition boards (e.g., body-worn patches combining temperature, respiration impedance, SpO2, and motion channels) thanks to its 12 single-ended inputs and 12-bit resolution. The internal reference and track/hold remove the need for precision external analog components, simplifying IEC 60601 EMI/RFI layouts by reducing the analog trace count. The wide operating temperature range and sub-1 µA power-down current support continuous-wear body-worn designs where battery life and patient safety dominate the BOM.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX1239LEEE+T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX1239KEEE+T | MAX1239MEEE+T | MAX1237LEEE+T | MAX1238LEEE+T | MAX1139MEEE+T | MAX1237EUA+TGA8 |
|---|---|---|---|---|---|---|---|
| Package | 16-QSOP | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same |
| 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) | Analog Devices (Maxim Integrated) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 10 bit | 12 bit |
| Input Channels | 12 single-ended / 6 differential | 12 / 6 | 12 / 6 | 12 / 6 | 12 / 6 | 12 / 6 | 12 / 6 |
| 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 | 4.5 V to 5.5 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 2.5 V | 2.5 V | 4.096 V | 2.5 V |
| Max Sampling Rate | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps |
| I2C Slave Address | L suffix (specific 7-bit address) | K suffix (different address) | M suffix (different address) | L suffix (different address) | L suffix (different address) | M suffix (different address) | L suffix (different address) |
Principais diferenciais
- Internal 4.096 V reference trims VDD scaling by 1 LSB (vs MAX1237LEEE+T (2.5 V reference))
- Two I2C address variants within the same pinout (vs MAX1236EEE+ (4-channel, single address))
- 94.4 ksps throughput at only 670 µA supply current (vs MAX1139MEEE+T (10-bit variant))
Notas de projeto
Decouple AVDD with a 10 µF + 0.1 µF ceramic pair placed within 5 mm of the pin, and add a separate 0.1 µF at DVDD. AVDD and DVDD may be tied together for 3.3 V systems, but split them at the IC pin to keep digital switching noise out of the analog reference. According to the Maxim MAX1236-MAX1239 datasheet typical application circuit, the REF pin requires a 4.7 µF + 0.1 µF bypass network when the internal reference is enabled; omitting this degrades gain error by 1-2 LSB.
Source impedance on each AIN should remain below approximately 2 kΩ to avoid IR-drop-induced gain error, especially in unipolar mode. For high-impedance sensors (e.g., bare thermistors), add a 1 kΩ + 10 nF RC filter in front of the AIN pin to limit current transients during the internal sampling capacitor's acquisition phase. The internal track/hold settles to 12-bit accuracy within 1.5 µs given proper bypassing. Route analog and digital grounds separately and join them at the IC's AGND pin (star-ground topology).
The MAX1239's 'L' suffix denotes a specific I2C slave address; the K and M suffixes select different addresses. Putting more than one L-suffix part on the same I2C bus causes bus collisions - verify your host firmware uses a unique address per device. Do not exceed the AVDD absolute maximum of 6 V; the MAX1238 (4.5-5.5 V variant) is the only one safe on a 5 V rail. Always enter software power-down (via the configuration register) before changing the reference mode to avoid spurious conversions during reconfiguration.
Informações de conformidade
RoHS compliant per Maxim/Analog Devices product page. Industrial -40 °C to +85 °C operating range ('E' suffix). Not AEC-Q100 qualified - select automotive-grade parts only if the application mandates it.
