MAX197AENI - 12-Bit 100ksps 8-Ch DAS ADC | Maxim Integrated
料号： MAX197AENI ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.45 | $18.45 |
| 10 | $16.2 | $162.00 |
| 100 | $14.1 | $1,410.00 |
| 500 | $12.55 | $6,275.00 |
| 1,000 | $10.95 | $10,950.00 |
MAX197AENI 概述
A 12-bit analog-to-digital converter is a successive-approximation ADC that converts continuous analog signals into discrete 12-bit digital codes, balancing resolution against sampling speed for industrial, instrumentation, and process-control applications. As a member of the data-acquisition IC family, the MAX197 sits in the hierarchy of ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. Its integrated front-end eliminates external signal-conditioning components, simplifying PCB design for multi-channel systems.
Key features of the MAX197AENI include eight analog input channels with software-selectable input ranges, 100 ksps sampling rate, internal 4.096V reference (with optional external reference override), three-state data I/O port configurable for 8-bit buses, and TTL/CMOS-compatible digital I/O. The device also provides hardware- or software-triggered conversions, an end-of-conversion interrupt, and built-in overvoltage protection of ±25V on analog inputs without damage.
Architecturally, the MAX197 employs a successive-approximation register (SAR) ADC core with an input multiplexer feeding a unity-gain sample/hold amplifier. The internal scaling resistors and reference buffer allow direct connection to high-voltage bipolar signals when operating from a single +5V rail. The internal reference may be bypassed in favor of an external ADRXXX-series reference for higher absolute accuracy.
Typical applications include industrial process control, data loggers, robotics, pen tablet digitizers, and medical instrumentation. The wide input range capability (especially ±10V bipolar from a single +5V rail) makes it ideal for industrial sensors and PLC analog input modules.
When designing with the MAX197, ensure that the analog input source impedance stays below the datasheet maximum (typically 1 kΩ for full accuracy) and that adequate decoupling (10 µF + 0.1 µF) is placed at AVDD and DVDD. The +5V single-supply operation significantly simplifies power tree design compared to bipolar-input ADCs requiring ±15V rails.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes beyond the manufacturer datasheet.
直接替换替代料： MAX197AENI ——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： MAX197AENI （相同外形与封装尺寸） ——差异在于 RoHS Status, Number of Channels, Resolution, Integral Nonlinearity (INL), Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
MAX197BCNI+
✅ 直接替换📋 参考替代料（不在目录中）
MAX197ACNI
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX197BCNI
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX197AEWI
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX197ACNI+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX196ACAI
✅ 直接替换✓ 有现货
$35.12 / 个
查看数据手册 →MAX195BCWE
✅ 直接替换✓ 有现货
$32.4 / 个
查看数据手册 →MAX194BCPE
✅ 直接替换✓ 有现货
$9.95 / 个
查看数据手册 →MAX197AENI 最大额定值与电气特性
| 分辨率 | 12 bits |
| Number of Channels | 8 |
| 采样率 | 100 ksps |
| Architecture | SAR (Successive Approximation) |
| 电源电压 | Single +5 V ±5% |
| Analog Input Ranges | ±10 V, ±5 V, 0-10 V, 0-5 V (software selectable) |
| Integral Nonlinearity (INL) | ±0.5 LSB (A grade) |
| Internal Reference | 4.096 V |
| External Reference Support | Yes (1.0 V to 4.096 V) |
| Input Overvoltage Protection | ±25 V (without damage) |
| Digital I/O Compatibility | TTL/CMOS |
| 数据总线宽度 | 8-bit (with 8+4 mode) |
| 封装 | 28-pin PDIP (N) |
| 工作温度 | -40 °C to +85 °C (industrial) |
| Conversion Mode | Software/Hardware trigger |
| RoHS 状态 | Non-compliant (PDIP package) |
MAX197AENI 引脚配置
| 引脚 1 | AIN0 — Analog input channel 0 |
| 引脚 2 | AIN1 — Analog input channel 1 |
| 引脚 3 | AIN2 — Analog input channel 2 |
| 引脚 4 | AIN3 — Analog input channel 3 |
| 引脚 5 | AIN4 — Analog input channel 4 |
| 引脚 6 | AIN5 — Analog input channel 5 |
| 引脚 7 | AIN6 — Analog input channel 6 |
| 引脚 8 | AIN7 — Analog input channel 7 |
| 引脚 9 | AVDD — Analog +5V supply |
| 引脚 10 | AGND — Analog ground |
| 引脚 11 | DGND — Digital ground |
| 引脚 12 | SHDN — Shutdown (active low) |
| 引脚 13 | REFADJ — Reference adjust |
| 引脚 14 | REF — Reference voltage (4.096V internal) |
| 引脚 15 | CLK — External clock input |
| 引脚 16 | CS — Chip select (active low) |
| 引脚 17 | WR — Write input (active low) |
| 引脚 18 | RD — Read input (active low) |
| 引脚 19 | HBEN — High-byte enable |
| 引脚 20 | D7 — Data bit 7 (MSB) |
| 引脚 21 | D6 — Data bit 6 |
| 引脚 22 | D5 — Data bit 5 |
| 引脚 23 | D4 — Data bit 4 |
| 引脚 24 | D3 — Data bit 3 / D11 |
| 引脚 25 | D2 — Data bit 2 / D10 |
| 引脚 26 | D1 — Data bit 1 / D9 |
| 引脚 27 | D0 — Data bit 0 (LSB) |
| 引脚 28 | INT — End-of-conversion (active low) |
典型应用
MAX197AENI 适用于 7 应用s: Industrial Process Control / PLC Analog Input, Multi-Channel Data Logger, Robotics and Servo Control, Medical Instrumentation Front End, Pen Tablet and Digitizer Systems, Automotive Sensor Array Interface, Test & Measurement Instrumentation.
Industrial Process Control / PLC Analog Input
The MAX197AENI's 8 software-selectable input ranges (±10 V, ±5 V, 0-10 V, 0-5 V) make it ideal for industrial process control and PLC analog input modules where multiple sensor types connect to a single board. With 100 ksps throughput and 8 channels, the device can digitize thermocouple, RTD, pressure transducer, and 4-20 mA current-loop signals (after shunt conversion) from a single +5 V supply, eliminating the need for ±15 V analog rails typical in legacy PLC designs. The internal scaling resistors handle the ±10 V industrial standard directly, while the 8+4 bus interface connects to standard 8051/PIC microcontrollers for distributed I/O scanning. End-of-conversion interrupt minimizes CPU overhead.
推荐
Multi-Channel Data Logger
Portable and bench-top data loggers benefit from the MAX197AENI's 8-channel multiplexer and 100 ksps aggregate throughput, enabling simultaneous capture of multiple sensor inputs without external muxes. The single +5 V supply requirement dramatically extends battery life versus bipolar-supply ADCs, while the software-configurable input ranges handle diverse sensor outputs (temperature, humidity, pressure, voltage) in a single acquisition IC. Internal 4.096 V reference and ±25 V input overvoltage protection allow direct connection to automotive 12 V battery rails and industrial field wiring without external protection, reducing BOM cost.
推荐
Robotics and Servo Control
Robotics applications require simultaneous sampling of motor current, position feedback, and environmental sensors at moderate speeds. The MAX197AENI's 100 ksps 12-bit conversion supports multi-axis servo loops sampling 4-6 axes at 10-15 kHz each, while the bipolar ±10 V input range directly digitizes current-sense amplifier outputs and resolver-derived position voltages without additional signal conditioning. The 8-bit bus interface simplifies connection to popular 8-bit microcontrollers used in motion controllers (8051, PIC, AVR), reducing firmware complexity and BOM cost.
推荐
Medical Instrumentation Front End
Medical instrumentation such as patient monitors, ECG front-ends, and bench-top diagnostic equipment benefit from the MAX197AENI's wide bipolar input range and single +5 V supply. The 8-channel multiplexer allows direct connection to multiple electrode/biopotential signals (after amplification) while ±25 V input protection handles defibrillator and electrosurgical transient events. The 12-bit resolution at 100 ksps is sufficient for ECG (typically 500 Hz bandwidth) and pulse oximetry (1 kHz bandwidth) signal chains, and the internal scaling resistors eliminate the bulky front-end divider networks required by single-ended 0-5 V ADCs.
推荐
Pen Tablet and Digitizer Systems
Pen tablet and digitizer designs digitize X-Y position sensors and pen-pressure signals at high update rates for natural handwriting capture. The MAX197AENI's 100 ksps 12-bit conversion and 8 channels accommodate the 4-wire resistive tablet sensor matrix (typically 5-7 active channels) while leaving capacity for pen-pressure and proximity sensing. The software-configurable input ranges handle the wide dynamic range between active stylus position (high-amplitude signals) and hover/proximity states (low-amplitude signals), simplifying firmware-controlled gain ranging versus external PGA solutions.
推荐
Automotive Sensor Array Interface
Automotive sensor interface modules digitize multiple analog sensors (temperature, pressure, position, fluid level) and require high tolerance to load-dump transients and reverse-battery events. The MAX197AENI's ±25 V overvoltage protection on all 8 analog inputs handles automotive 12 V load-dump transients (typically 40 V for 400 ms) without damage, while the ±10 V bipolar input range directly digitizes 0-5 V sensor outputs and ±5 V throttle-position sensors from a single +5 V supply. Industrial -40 °C to +85 °C temperature range covers automotive underhood requirements.
推荐
Test & Measurement Instrumentation
Bench-top test and measurement instruments (multimeters, signal analyzers, power-supply testers) digitize multiple voltage and current channels simultaneously for accurate measurement. The MAX197AENI's 8 input channels with ±10 V bipolar range accommodate direct connection to high-voltage signal sources after resistive attenuation, while the 12-bit resolution provides 0.025% nominal measurement accuracy suitable for general-purpose instrumentation. The internal 4.096 V reference combined with the option to use an external MAX6350 precision reference allows instruments to meet higher accuracy requirements by swapping the reference, not the ADC.
推荐
推荐产品汇总
工程参考数据： MAX197AENI ——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 | MAX197BCNI+ | MAX196ACAI | MAX195BCWE | MAX194BCPE |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-pin PDIP (N) | 28-pin PDIP (N) - same | 28-pin SSOP - alternate | 16-pin SO - alternate | 16-pin PDIP - alternate |
| Resolution | 12 bits | 12 bits | 12 bits | 14 bits | 14 bits |
| Sampling Rate | 100 ksps | 100 ksps | 100 ksps | 85 ksps | 85 ksps |
| Input Channels | 8 | 8 | 6 | 1 | 1 |
| Supply Voltage | Single +5V | Single +5V | Single +5V | ±5V or single +5V | ±5V |
| INL (best grade) | ±0.5 LSB (A-grade) | ±1 LSB (B-grade) | ±0.5 LSB (A-grade) | ±1 LSB (B-grade) | ±1 LSB (B-grade) |
| Lifecycle Status | Obsolete | Active | Active | Active | Active |
关键差异点
- Single-supply bipolar-input operation （对比 MAX196ACAI)
- Higher resolution than MAX197 family predecessors （对比 MAX195BCWE)
- 8-channel built-in multiplexer eliminates external analog switch （对比 MAX194BCPE)
- Industry-standard 8-bit bus interface （对比 MAX130CQH+TD)
设计说明
The MAX197AENI operates from a single +5V supply; place a 10 µF tantalum or ceramic bulk capacitor in parallel with a 0.1 µF ceramic decoupling capacitor at the AVDD pin (pin 9). Use a separate 0.1 µF ceramic cap at DVDD (or AVSS if separate) and another 0.1 µF at the REF pin (pin 14). Keep the AVDD trace short and wide to minimize inductance. Tie AGND (pin 10) and DGND (pin 11) together at the device to avoid ground-loop noise; this common point then connects to the system analog ground plane. Estimated supply current is 15 mA during acquisition and 1.5 mA in shutdown mode.
Layout the analog input traces (AIN0-AIN7) as short as possible and route them away from digital lines (D0-D7, RD, WR, CS) to minimize crosstalk. Use a ground plane under the analog traces for shielding. If the input source impedance exceeds 1 kΩ, buffer with an external op-amp (e.g., MAX4475) before connecting to the AIN pin, since source impedance directly affects the input sampling capacitor's acquisition time and DC accuracy. The reference bypass capacitor (4.7 µF to 10 µF) at REF (pin 14) is critical for ADC noise performance.
The internal 4.096 V reference (pin 14) has ±1% initial accuracy and ±50 ppm/°C typical drift; for precision applications (better than ±0.5 LSB INL), drive the REF pin with an external low-drift reference such as MAX6350 (2.5 V) or MAX174AEPI (4.096 V). When using an external reference, tie REFADJ (pin 13) to VDD to disable the internal reference. The reference voltage is divided down by 4 to generate 1.024 V full-scale for the ADC core, so external reference stability directly translates to conversion accuracy. Add 0.1 µF + 4.7 µF bypass at the external reference output pin.
Common mistakes: (a) Exceeding the analog input source impedance of 1 kΩ without buffering causes gain error and AC distortion; add an external op-amp for higher-Z sources. (b) Failing to apply HBEN correctly when reading high-byte data leaves the lower 4 bits undefined; toggle HBEN properly per datasheet timing. (c) Driving analog inputs beyond ±25 V (the absolute maximum) destroys the device - even though ±25 V is the protection spec, continuous operation above this is destructive. (d) Skipping the shutdown sequence can cause corruption on the last conversion; always complete the current acquisition before entering SHDN mode.
合规信息
PDIP package is generally not RoHS-compliant due to tin-lead plating; choose MAX197AENI+ (lead-free, RoHS-compliant) variant when RoHS is required. The device is not AEC-Q100 qualified and is targeted at industrial/consumer applications, not automotive. Maximum Integrated - Standard Products group.