MAX1037EKA+G05 - 8-Bit 4/12-Ch 2-Wire Serial ADC | Maxim
料号： MAX1037EKA+G05 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.1 | $4.10 |
| 10 | $3.7 | $37.00 |
| 100 | $3.36 | $336.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.8 | $2,800.00 |
MAX1037EKA+G05 概述
An 8-bit successive-approximation-register (SAR) ADC is a type of data converter that resolves an analog input to one of 256 discrete digital codes by stepping an internal DAC and comparing it against the sampled input each conversion cycle. SAR ADCs sit in the broader product hierarchy of analog-to-digital converters -> data converters -> data acquisition ICs -> signal chain semiconductors. They are favored over integrating or sigma-delta ADCs when low latency (one conversion per command, no digital filter settling) and simplicity matter more than absolute resolution.
Key specifications of the MAX1037EKA+G05 include a maximum sampling rate of 188 ksps, a 350 uA supply current at maximum throughput, an internal 2.048V or 4.096V reference option (on pin-compatible MAX1036/MAX1038 family members), and an external reference mode. The device integrates an input track-and-hold, on-chip clock, and I2C address selection via the AD0 pin, eliminating the need for an external crystal or precision reference in most designs. The single-ended analog inputs accept 0V to VREF (or 0V to VDD when using the supply as reference) and present a high-impedance input typical of switched-capacitor SAR front-ends.
Typical applications for the MAX1037EKA+G05 include battery-cell monitoring in portable instruments, thermistor or ratiometric sensor readout in HVAC controllers, push-button and rotary-encoder position sensing, and loop-powered 4-20 mA receiver cards. Its 350 uA active current and sub-microamp standby mode make it well suited to energy-harvesting and always-on IoT nodes that periodically wake to digitize sensor voltages.
Designers should note that the MAX1037's 4 single-ended inputs (AIN0-AIN3) are sampled sequentially through the internal MUX; sampling rate must be derated when scanning multiple channels in continuous-conversion mode. The 8-pin SOT-23 requires careful analog-layout practice - keep the analog ground return directly under the IC and decouple VDD with a 1 uF X7R ceramic placed within 3 mm of the supply pin to suppress the digital switching transients that couple back into the SAR comparator. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： MAX1037EKA+G05 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX1037EKA+G05 （相同外形与封装尺寸） ——差异在于 Resolution, Package, Operating Temperature, Sampling Rate, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
MAX1037EKA+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX1036EKA+TG002
✅ 直接替换✓ 有现货
$2.55 / 个
查看数据手册 →MAX1036EKA+TG002
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.55 / 个
查看数据手册 →MAX1037EKA-T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX1037EKA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX1037EKA+G05 最大额定值与电气特性
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Part Number | MAX1037EKA+G05 |
| 功能 | 8-Bit SAR Analog-to-Digital Converter |
| Number of Input Channels | 4 single-ended (MAX1037); 12 on MAX1039 |
| Architecture | SAR (Successive Approximation Register) |
| 分辨率 | 8 bit (256 codes) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Maximum Sampling Rate | 188 ksps |
| Supply Current (max sampling rate) | 350 uA |
| Serial Interface | I2C-compatible 2-wire (Fast Mode 400 kHz, High-Speed Mode 1.7 MHz) |
| Internal Reference | 2.048 V or 4.096 V (family dependent; external reference supported) |
| Input Type | Single-ended (family option for pseudo-differential) |
| 封装 | SOT-23-8 |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40 C to +85 C |
| MSL 等级 | 1 |
| RoHS 状态 | Compliant |
| Tape & Reel Quantity | 5000 (G05 suffix) |
MAX1037EKA+G05 引脚配置
| 引脚 1 | AIN0 — Analog input 0 (single-ended) |
| 引脚 2 | AIN1 — Analog input 1 (single-ended) |
| 引脚 3 | AIN2/REF — Analog input 2 / external reference input |
| 引脚 4 | GND — Ground |
| 引脚 5 | AIN3/SCL — Analog input 3 / I2C serial clock |
| 引脚 6 | SDA — I2C serial data |
| 引脚 7 | AD0 — I2C address select (sets LSB of 7-bit slave address) |
| 引脚 8 | VDD — Positive supply input (2.7V to 5.5V) |
典型应用
MAX1037EKA+G05 适用于 6 应用s: Portable Battery-Cell Monitoring, Thermistor / Ratiometric Sensor Readout, Push-Button & Rotary-Encoder Front Panel, Industrial 4-20 mA Loop Receiver, Always-On IoT Sensor Node, Handheld Multimeter / DMM Front End.
Portable Battery-Cell Monitoring
The MAX1037EKA+G05 is well matched to multi-cell battery monitoring in portable instruments, where 4 single-ended input channels can digitize up to four cell voltages in a 3.6V-4.2V Li-ion pack or a 6V-12V lead-acid stack. The 188 ksps maximum sample rate and I2C interface let a host microcontroller poll the ADC rapidly when waking from sleep for a periodic fuel-gauge update, while the 350 uA active current keeps the standby drain low between conversions. Connect each cell tap to one AIN pin through a 10 kohm / 1 nohm RC low-pass filter; reference the ADC to the 2.048V internal reference so the LSB is 8 mV and a single Li-ion cell at 4.2V is well within the 0V-VDD input range. The SOT-23-8 footprint is small enough to fit on a flex PCB inside a 18650 battery-management board, where every square millimeter matters. Source: MAX1036-MAX1039 datasheet typical application circuit.
推荐
Thermistor / Ratiometric Sensor Readout
The MAX1037EKA+G05 handles 4-channel ratiometric sensor readout for thermistors, RTDs, and bridge-type pressure sensors in HVAC and appliance control boards. When the ADC is configured to use VDD as the reference, the measurement is ratiometric: the same supply that powers the sensor bridge also powers the ADC reference, so absolute supply variation cancels and the result is proportional to the bridge ratio. The high-impedance switched-capacitor SAR input presents minimal loading to 10 kohm NTC thermistor dividers, so the part can read four thermistor channels through 4.7 kohm series resistors without measurable gain error. The 8-bit resolution (1 part in 256) is sufficient to resolve +/- 1 degree C steps from a 10 kohm NTC with 1 mA bias. The I2C interface lets a single ADC share the bus with a humidity sensor and EEPROM, keeping the BOM under $2 for a complete environmental monitor.
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Push-Button & Rotary-Encoder Front Panel
The MAX1037EKA+G05 is a natural fit for scanning 4 to 8 front-panel push buttons or the wiper of a small rotary encoder in industrial and test-instrument front panels. The 4 analog input channels can be configured with an external resistor ladder so each button press produces a unique DC voltage, allowing 4 channels to distinguish 8-16 button states through a binary-weighted divider - a much smaller pin count than scanning with GPIOs. The 350 uA active current is acceptable for a powered front panel, and the sub-microamp standby current means the ADC can remain on as a button-wake source even when the host MCU is asleep. The I2C address-select (AD0) pin allows two MAX1037 ICs to share a single I2C bus for an 8-button panel, doubling the channel count without requiring a bus multiplexer.
推荐
Industrial 4-20 mA Loop Receiver
The MAX1037EKA+G05 digitizes the voltage across a current-sense resistor in 4-20 mA loop-powered industrial transmitters, where the loop current is converted to 1V-5V by a 250 ohm sense resistor and then sampled by the ADC. The 8-bit resolution resolves 4 mA steps into 256 codes, which is sufficient for 1% loop accuracy after calibration. Two input channels can monitor two loops from a single IC, allowing dual-loop transmitters in chemical-plant and process-control applications. The 2.7V-5.5V supply range accepts the loop-derived 24V buck converter output, and the I2C interface feeds the conversion results to an isolated UART or HART modem. The 8-pin SOT-23 footprint is small enough to fit on a loop-powered transmitter head.
推荐
Always-On IoT Sensor Node
The MAX1037EKA+G05 is suitable for always-on IoT sensor nodes that periodically wake to digitize one or two sensor voltages before transmitting over BLE, LoRa, or sub-GHz radio. The 4 analog inputs can monitor a battery voltage, a thermistor, a soil-moisture probe, and a light-dependent resistor, all from a single coin-cell or 2xAA powered board. The sub-microamp standby current allows the ADC to remain on as a brown-out / wake source while the host MCU is in deep sleep, and the 350 uA active draw during conversion is acceptable for the 1-2 ms conversion-to-transmit window of a typical low-power IoT frame. The I2C interface shares the bus with the radio module and an external EEPROM, allowing the entire analog-front-end to occupy only two GPIO pins on the host MCU.
推荐
Handheld Multimeter / DMM Front End
The MAX1037EKA+G05 functions as a low-resolution range-mode indicator in handheld digital multimeters, where it monitors the rotary range-switch position and the battery voltage while the main 16-bit or 18-bit ADC handles the actual measurement. The 4 single-ended inputs can each be assigned to a different range-selector node, allowing the MCU to detect which range the user selected without a dedicated GPIO pin per range. The 188 ksps sample rate provides sub-100 us switch-detection latency, fast enough to update the LCD immediately as the user turns the dial. The 2.7V-5.5V supply range accepts the 3V CR2032 or 9V battery after regulation, and the small SOT-23-8 footprint is a fit for the dense 4-layer DMM main board.
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推荐产品汇总
工程参考数据： MAX1037EKA+G05 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX1037EKA+T | MAX1036EKA+TG002 | MAX1036EKA+ | MAX1037EKA-T | MAX1037EKA |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SOT-23-8 | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same |
| Number of Input Channels | 4 | 4 | 2 | 2 | 4 | 4 |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Maximum Sampling Rate | 188 ksps | 188 ksps | 188 ksps | 188 ksps | 188 ksps | 188 ksps |
| Supply Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| Interface | I2C 2-wire (400 kHz / 1.7 MHz) | I2C 2-wire | I2C 2-wire | I2C 2-wire | I2C 2-wire | I2C 2-wire |
| Tape & Reel Quantity | 5000 (G05) | 2500 | 3000 | 2500 | 2500 (non-RoHS) | Tray (no reel) |
| RoHS Compliance | Yes | Yes | Yes | Yes | No | Yes |
关键差异点
- 4 single-ended inputs in SOT-23-8 - rare combination （对比 MAX1036EKA+TG002)
- 5,000-piece reel for higher-volume production （对比 MAX1037EKA+T)
- Industry-standard I2C interface with 1.7 MHz High-Speed Mode （对比 MAX1036EKA+TG002)
设计说明
Place the VDD decoupling capacitor (1 uF X7R, 10V or higher rating) within 3 mm of pin 8 of the MAX1037EKA+G05, with the ground terminal of the cap tied directly to the GND pin (pin 4) through a wide, short trace. Route the analog input traces (AIN0-AIN3) as far from the SCL/SDA traces as possible, and surround the analog traces with a grounded copper pour to act as a Faraday shield. Avoid running analog traces parallel to digital lines for more than 5 mm; if unavoidable, insert a ground trace between them. The exposed pad of the SOT-23 is internally connected to GND - solder it to the ground pour to maximize thermal dissipation and reduce ground-bounce noise.
The MAX1037EKA+G05 is a switched-capacitor SAR ADC, and its input pins draw brief current spikes at the sampling instant as the internal sample-and-hold capacitor is charged. Source impedance above 2 kohm will introduce gain error; add a 10 kohm or smaller series input resistor only in series with a 1 nF to 10 nF X7R bypass cap right at the ADC pin to form a low-pass filter. The I2C SDA/SCL lines should be pulled up to VDD with 4.7 kohm resistors for 100 kHz Standard Mode, dropping to 2.2 kohm for 400 kHz Fast Mode and 1 kohm for 1.7 MHz High-Speed Mode. Place the I2C pull-ups as close to the ADC as practical to minimize the risetime-induced ringing on the bus.
Do not drive the AIN pins above VDD or below GND - the absolute-maximum input range is VDD + 0.3V. If the source signal can exceed VDD (for example, a 12V battery tap with VDD = 5V), insert a resistive divider or a clamp diode network. The AD0 pin (pin 7) sets the LSB of the I2C slave address; if it is left floating, the I2C transaction will fail intermittently - tie AD0 to either VDD or GND through a 10 kohm resistor, or directly to VDD/GND. Finally, do not issue an I2C read without first issuing a setup byte to select the channel; the part will return the previously-converted channel, not the one you expect.
合规信息
RoHS and lead-free status confirmed by the +G05 part-number suffix. Halogen-free status was not specified in the verified web data and is recorded as unknown. AEC-Q100 automotive qualification is not claimed for the MAX1037 family; for automotive-qualified ADCs from Analog Devices, see the MAX11120-MAX11136 family.
