MAX1115EKA+TG002 - 8-Bit 100kSPS Serial ADC, SOT-23-8 | Maxim
MPN： MAX1115EKA+TG002 ✓ 啟用中MAX1115EKA+TG002 概覽
An ADC (analog-to-digital converter) is a data-acquisition integrated circuit that converts a continuous analog voltage on its input pin into a discrete digital code, enabling microcontrollers and DSPs to process real-world signals. ADCs sit in the data-converter hierarchy under data acquisition ICs and the broader mixed-signal/power-management family. The MAX1115's SAR (successive-approximation-register) architecture delivers deterministic, low-latency conversions ideal for multiplexed sensor monitoring. ADCs are foundational to instrumentation, audio, industrial control, and battery-powered IoT designs.
The MAX1115EKA+TG002 features 100 kSPS throughput, 175 µA typical supply current at maximum sampling, 8 single-ended input channels (1 at a time through an internal analog mux), an internal 2.048 V reference, and a hardware-/software-configurable shutdown mode that drops quiescent current to under 1 µA between conversions. The integrated VDD monitor and internal oscillator eliminate the need for external components, reducing BOM cost and PCB area.
The MAX1115 uses a successive-approximation-register (SAR) topology with an internal capacitive DAC and a precision 2.048 V bandgap reference. Conversions are triggered by an external SSTRB strobe or internal clock and serialized over DOUT. The part operates from a single +2.7 V to +5.5 V supply, simplifying system power design when digitizing 0-to-VDD or 0-to-VREF signals. The internal reference adds stability over temperature, although for absolute accuracy an external reference may be preferred on precision acquisitions.
Typical applications include portable battery-powered instrumentation, loop-powered 4-20 mA sensor transmitters, handheld multimeters and data loggers, touch-panel/joystick position sensing, system-monitoring inputs on microcontroller boards, and isolated front-ends for industrial PLCs. The SOT-23-8 package and shutdown mode make the device particularly suitable for space- and energy-constrained designs.
When designing with this ADC, place a 0.1 µF decoupling capacitor as close as possible to the VDD pin and keep the analog input traces short and guarded. For signals exceeding VREF, use an input divider to maintain linearity. The MAX1115EKA+TG002 is a packaging/reel-code variant (TG002 denotes a specific reel quantity) of the base MAX1115EKA+T; both share identical silicon and pinout.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that complement the Maxim datasheet.
直接替換替代品，適用於 MAX1115EKA+TG002 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX1115EKA+TG002 （相同外形與佔位） — 差異在於 Package, Sampling Rate, Supply Voltage, Architecture, Resolution.
MAX1115EKA+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1115EKA+G002
✅ 直接替換聯絡詢價
查看資料表 →MAX1116EKA+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1036EKA+TG002
✅ 直接替換聯絡詢價
查看資料表 →MAX1037EKA+TG05
✅ 直接替換聯絡詢價
查看資料表 →MAX1115EKA+TG002 最大額定值與電氣特性
| 解析度 | 8 bit |
| 取樣率 | 100 kSPS |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 (single-ended, internal mux) |
| 供應電壓 | +2.7 V to +5.5 V |
| Supply Current (100 kSPS) | 175 µA (typical) |
| 關機電流 | < 1 µA |
| Internal Reference Voltage | 2.048 V |
| 介面 | 3-wire serial (SPI/QSPI/MICROWIRE-compatible) |
| Full-Scale Analog Input Range | 0 V to VREF (or 0 V to VDD with external reference) |
| 封裝 | SOT-23-8 |
| 工作溫度範圍 | -40 °C to +85 °C (E grade) |
| 安裝類型 | Surface Mount |
| MSL 等級 | 1 (per JEDEC J-STD-020) |
| RoHS 狀態 | Compliant |
MAX1115EKA+TG002 腳位配置
| 腳位 1 | CS — Active-low chip select input |
| 腳位 2 | DIN — Serial data input |
| 腳位 3 | DOUT — Serial data output |
| 腳位 4 | SSTRB — Conversion strobe (end-of-conversion indicator) |
| 腳位 5 | GND — Ground |
| 腳位 6 | REF — Reference voltage input/output (internal 2.048 V reference) |
| 腳位 7 | AIN — Analog input |
| 腳位 8 | VDD — Positive supply voltage (+2.7 V to +5.5 V) |
典型應用
MAX1115EKA+TG002 適用於 6 應用s: Portable Battery-Powered Instrumentation, 4-20 mA Loop-Powered Sensor Transmitters, System Monitoring on Microcontroller Boards, Touch Panel / Position Sensing, Handheld Multimeters and Data Loggers, Isolated Industrial PLC Front-Ends.
Portable Battery-Powered Instrumentation
The MAX1115EKA+TG002 fits battery-powered instrumentation because its 175 µA supply current at 100 kSPS and sub-1 µA shutdown current extend battery life, while its single +2.7 V to +5.5 V supply matches a single lithium or two-AA cell stack. Its 8-bit resolution is adequate for displaying temperature, pressure, and battery-voltage readings on handheld DMMs and portable data loggers. The internal 2.048 V reference eliminates the need for an external reference IC, reducing BOM cost. Placed near the sensor with a 0.1 µF VDD decoupling cap, it converts sensor voltages on demand and shuts down between samples to minimize average power.
推薦
4-20 mA Loop-Powered Sensor Transmitters
The MAX1115EKA+TG002 is well suited for 4-20 mA industrial loop-powered transmitters where its small SOT-23-8 footprint and low quiescent current fit inside a sensor head. Its single-ended 0-V-to-VREF input range digitizes the loop-current sense resistor voltage directly, and its 3-wire serial interface connects to a low-power microcontroller for HART or analog output processing. The internal 2.048 V reference provides stable conversion of small sensor signals. Loop-side converters inject 24 V DC to power the MAX1115 from the loop current; ensure VDD stays within the +2.7 V to +5.5 V operating range.
推薦
System Monitoring on Microcontroller Boards
The MAX1115EKA+TG002 works well as a system-monitor ADC on microcontroller development boards and embedded designs. Its SPI-compatible serial interface connects directly to any microcontroller SPI peripheral, and its 8-bit/100 kSPS performance is sufficient for monitoring rail voltages, temperature sensors, and potentiometer settings. The hardware-shutdown pin enables the MCU to power-gate the converter when not sampling, extending sleep-mode battery life. The small SOT-23-8 footprint adds only a few mm² of PCB area, ideal for compact designs.
推薦
Touch Panel / Position Sensing
The MAX1115EKA+TG002 is appropriate for resistive touch-panel position sensing and joystick digitizing where its 8-bit resolution provides adequate coordinate precision and its 100 kSPS rate supports smooth cursor tracking. The single AIN input with internal MUX simplifies touch-controller firmware. The internal reference is sufficient for 4-wire touch applications. Place the ADC close to the touch-panel connector with guarded analog traces; route the digital SPI signals away from the analog input to prevent digital-coupling noise from corrupting conversion results.
推薦
Handheld Multimeters and Data Loggers
The MAX1115EKA+TG002 suits handheld digital multimeters (DMMs) and portable data loggers where 8-bit resolution is sufficient for general-purpose voltage, current, and resistance measurements in entry-level instruments. Its low supply current extends battery life during long logging sessions, and the SOT-23-8 package enables compact handheld form factors. The internal track-and-hold captures fast input transients accurately at 100 kSPS. For higher-precision DMMs requiring 12-bit or better, upgrade to the MAX1036EKA+TG002 (12-bit, same package, software changes needed).
推薦
Isolated Industrial PLC Front-Ends
The MAX1115EKA+TG002 is suitable for isolated analog input front-ends on industrial PLCs where its small footprint and 8-bit resolution work well for status monitoring rather than precision measurement. Place the ADC on the field side of an isolation barrier; its low power consumption keeps field-side power dissipation minimal, and the SPI interface drives digital isolators (such as MAX14850 or ADuMi40x) cleanly. The internal reference simplifies field-side BOM. For 4-20 mA inputs, add a current-sense resistor and a single-supply op-amp such as MAX4475 ahead of the AIN pin.
推薦
推薦產品摘要
工程參考資料，適用於 MAX1115EKA+TG002 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX1115EKA+T | MAX1115EKA+G002 | MAX1116EKA+T | MAX1036EKA+TG002 | MAX1037EKA+TG05 |
|---|---|---|---|---|---|---|
| Package | SOT-23-8 | SOT-23-8 | SOT-23-8 | SOT-23-8 | SOT-23-8 | SOT-23-8 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 12 bit | 12 bit |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 94.4 kSPS | 94.4 kSPS |
| Supply Voltage Range | +2.7 V to +5.5 V | +2.7 V to +5.5 V | +2.7 V to +5.5 V | +4.5 V to +5.5 V | +2.7 V to +3.6 V (or +4.75 V to +5.25 V) | +2.7 V to +3.6 V |
| Internal Reference | 2.048 V | 2.048 V | 2.048 V | 2.048 V | 2.048 V (internal) | 2.048 V (internal) |
| Interface | 3-wire SPI/QSPI/MICROWIRE serial | 3-wire SPI/QSPI/MICROWIRE serial | 3-wire SPI/QSPI/MICROWIRE serial | 3-wire SPI/QSPI/MICROWIRE serial | SPI/QSPI/MICROWIRE serial | SPI/QSPI/MICROWIRE serial |
主要差異化特點
- Lowest-cost Maxim 8-bit SAR ADC with internal reference in SOT-23-8 (對比MAX1116EKA+T)
- Lowest active and shutdown supply current in its class (對比MAX1036EKA+TG002)
- Pin-compatible upgrade path to 12-bit resolution (對比MAX1036EKA+TG002)
設計說明
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the VDD pin (pin 8) and connect the ground side directly to the GND pin (pin 5) with a short, wide trace. The MAX1115EKA+TG002 draws 175 µA at 100 kSPS and drops to <1 µA in shutdown; the VDD rail must remain stable during shutdown wakeup to avoid spurious first conversions. For battery-powered designs, place a 10 µF bulk capacitor near the supply pin to support inrush current when exiting shutdown.
Route the analog input trace (AIN, pin 7) away from digital SPI traces (CS, DIN, DOUT, SSTRB) to prevent digital switching noise from coupling into the conversion result. Use a guarded analog ground island if the board mixes noisy digital circuitry. Keep the REF pin trace short; if using the internal 2.048 V reference, leave REF floating or place a 0.1 µF bypass capacitor on REF to ground to filter reference noise.
Do not drive AIN above VDD or below GND; the MAX1115EKA+TG002 input is single-ended with absolute maximum VDD+0.3 V. For signals exceeding VREF (2.048 V), use an external resistive divider and account for the input-sampling charge injection (typically 15-25 pC) which can disturb high-impedance source signals - add an op-amp buffer such as MAX4475 for source impedances above 10 kΩ. Verify CS timing against the timing diagram in the Maxim datasheet to avoid framing errors.
The MAX1115EKA+TG002 SAR architecture draws charge from the AIN pin during acquisition; source impedance above approximately 10 kΩ degrades DC accuracy because the acquisition time cannot fully settle the internal sampling capacitor. For source impedances between 10 kΩ and 100 kΩ, add an external 100 pF bypass capacitor on AIN to ground to provide local charge reservoir. For source impedances above 100 kΩ, buffer with a low-leakage op-amp such as the MAX4475 or LMP7704 to preserve 8-bit linearity.
合規資訊
RoHS-compliant per Maxim/Analog Devices product page. Lead-free and halogen-free packaging. Not AEC-Q100 qualified - automotive applications should consult Analog Devices automotive-grade portfolio (e.g., MAX1115EKA/V+) for qualified parts.
