MAX198BCAI - 12-Bit 6-Ch 100ksps DAS ADC | Maxim Integrated
MPN： MAX198BCAI ✓ 啟用中MAX198BCAI 概覽
A multi-range, multi-channel DAS (Data Acquisition System) is an integrated analog front-end plus ADC subsystem that combines an input multiplexer, channel-level signal conditioning, a sample-and-hold, a reference, and a successive-approximation ADC into a single IC. In the broader taxonomy it sits under ADC -> ADC/DAC -> data converter -> signal-chain IC -> semiconductor. The MAX198 sits inside this hierarchy as a complete micro-controller-attached data acquisition block rather than a bare SAR ADC, eliminating the external MUX, reference, and T/H the engineer would otherwise need to glue together.
Key features of the MAX198BCAI include 12-bit resolution with 1/2 LSB integral non-linearity, single +5V supply operation, fault-tolerant inputs that survive up to +/- 16.5V without damage, an internal 4.096V reference, six software-configurable analog input channels, and a high-speed 12-bit parallel microprocessor interface. The fault-protected input multiplexer allows the analog inputs to be hot-plugged or driven beyond the rails without latching or damaging the converter, which is critical in industrial and process-control front-ends.
Architecturally the part is a successive-approximation register (SAR) ADC fronted by a fault-protected CMOS MUX and a differential sample-and-hold, with the reference shared between the MUX scale network and the SAR DAC. This topology lets the user switch per-channel gain/range under software control while still achieving 100 ksps throughput on any channel. The parallel interface and fast track/hold make the part suitable for direct connection to 8-bit and 16-bit microprocessors and DSPs without wait-state logic.
Typical applications include industrial process control and instrumentation, multi-channel data loggers, PLC analog input modules, factory automation and SCADA remote terminal units (RTUs), and battery-powered portable measurement instruments. Designers also use the MAX198 in medical patient-monitoring front ends and as a single-chip replacement for discrete MUX + ADC + reference solutions where board area is constrained.
When designing with the MAX198BCAI, place a 10 uF (minimum) and a 0.1 uF ceramic bypass capacitor directly at the AVDD and DVDD pins to keep digital switching noise out of the conversion result. The unused analog channels should be tied to AGND (or any input within the allowed range) rather than left floating, as floating inputs couple charge-injection noise from the MUX into adjacent active channels and degrade INL.
直接替換替代品，適用於 MAX198BCAI — 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： MAX198BCAI （相同外形與佔位） — 差異在於 Package, Supply Voltage, Mounting Type, Resolution, Sampling Rate.
MAX198BCAI+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX198BCAI+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX198AEAI+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX196ACAI+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX198BCWI+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX198BEWI+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX198BCAI 最大額定值與電氣特性
| Manufacturer | Maxim Integrated (now Analog Devices) |
| Part Number | MAX198BCAI |
| 功能 | 6-Channel 12-Bit Multi-Range Data Acquisition System (DAS) ADC |
| 解析度 | 12 bit |
| 取樣率 | 100 ksps |
| Number of Channels | 6 |
| 供應電壓 | Single +5 V |
| Input Range (unipolar) | 0 V to +5 V (software-selectable); 0 V to +VREF |
| Integral Non-Linearity (B-grade) | 1/2 LSB (max) |
| Internal Reference | 4.096 V |
| External Reference Option | Yes |
| 介面 | 12-bit parallel (8/16-bit microprocessor compatible) |
| Fault Protection | Input multiplexer tolerant to +/- 16.5 V |
| 封裝 | 28-pin SSOP (0.209 inch / 5.30 mm body width) |
| 安裝類型 | Surface Mount |
| Lead-Free / RoHS | Lead-Free, RoHS Compliant |
| Temperature Grade | Commercial |
MAX198BCAI 28-pin ssop (0.209 inch / 5.30 mm body width) 腳位配置指南
MAX198BCAI（28-pin ssop (0.209 inch / 5.30 mm body width) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： MAX198BCAI.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX198BCAI 適用於 6 應用s: PLC Analog Input Module, Multi-Channel Data Logger, Industrial Process Control Instrumentation, Factory Automation and SCADA RTU, Portable Battery-Powered Measurement Instrument, Medical Patient Monitoring Equipment.
PLC Analog Input Module
The MAX198BCAI's +/- 16.5 V fault-protected 6-channel input multiplexer and single +5 V operation make it a strong fit for PLC analog input modules that must survive field-wiring faults on +/- 10 V or 0-10 V transducer signals. With 100 ksps per channel and 1/2 LSB INL (B-grade), it delivers the 0.1% full-scale accuracy expected of mid-range process-control PLC cards. Placed at the field-side of the opto-isolated digital boundary, it converts 4-8 channels into a parallel 12-bit data bus that the backplane microcontroller reads directly without glue logic. The internal 4.096 V reference eliminates the need for an external precision reference in low-cost PLC designs.
推薦
Multi-Channel Data Logger
The 6 single-ended channels, 100 ksps throughput, and 0-5 V unipolar input range of the MAX198BCAI map directly onto a typical multi-channel data logger front-end that monitors several sensors (thermocouples via cold-junction compensation, RTDs, strain gauges, and 4-20 mA sense resistors). Using software-selectable 0-VREF or 0-5 V ranges per channel, the designer can scale each transducer to fill the converter's dynamic range. The internal 4.096 V reference provides ratiometric stability for the bridge-type sensors, while the 1/2 LSB INL (B-grade) keeps thermocouple-linearization residuals below the noise floor.
推薦
Industrial Process Control Instrumentation
In process-control loops, the MAX198BCAI converts 4-8 process variables (pressure, flow, level, temperature) into a 12-bit digital stream for a PID controller or remote terminal unit (RTU). The fault-protected inputs survive mis-wired transmitters and inductive transients that would destroy unprotected ADCs, eliminating field-replacement costs. Combined with 100 ksps per channel throughput, the device supports the 100 Hz loop rates typical of flow and pressure PID loops without aliasing. The 28-SSOP industrial footprint also fits inside the dense backplane of modular I/O cards where PCB area is at a premium.
推薦
Factory Automation and SCADA RTU
The MAX198BCAI is widely deployed in factory automation and SCADA remote terminal units that scan multiple analog points (motor currents, tank levels, valve positions) over an RS-485 or Ethernet fieldbus. The parallel 12-bit interface connects directly to 8-bit industrial microcontrollers (8051, Z80 derivatives) without wait-state logic, simplifying firmware. Single +5 V operation matches the +5 V system rail already present in the RTU, eliminating a second regulator. Fault-protected inputs reduce warranty returns from mis-wired field terminations, an important metric for unattended RTUs deployed at remote sites.
推薦
Portable Battery-Powered Measurement Instrument
The single +5 V supply and 6-channel integration make the MAX198BCAI an efficient front-end for portable, battery-powered measurement instruments such as handheld multimeters, environmental analyzers, and field service tools. By consolidating the MUX, T/H, ADC, and reference into one chip, the designer saves both PCB area (critical for handheld enclosures) and quiescent current compared with a discrete MUX + ADC + reference solution. The 0-VREF unipolar range scales cleanly from single-cell Li-ion voltages after the divider, simplifying power-rail monitoring.
推薦
Medical Patient Monitoring Equipment
In medical patient monitoring systems (multi-parameter bedside monitors, ECG/EEG acquisition carts), the MAX198BCAI's 6 channels can be allocated to ECG leads, respiration, SpO2 signal conditioning, temperature, and invasive pressure channels. The B-grade 1/2 LSB INL and tight DNL keep baseline drift well below clinical thresholds, while the internal 4.096 V reference gives stable ratiometric scaling of low-amplitude biopotential signals. The fault-protected input multiplexer accepts defibrillator pulses and electrosurgical transients that would otherwise damage a bare ADC, a key safety requirement in IEC 60601-1 compliant patient monitors.
推薦
推薦產品摘要
工程參考資料，適用於 MAX198BCAI — 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 | MAX198BCAI+ | MAX198BCAI+T | MAX198AEAI+ | MAX196ACAI+ | MAX198BCWI+ | MAX198BEWI+ |
|---|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Channels | 6 single-ended | 6 single-ended | 6 single-ended | 6 single-ended | 6 single-ended | 6 single-ended | |
| Sampling Rate | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps | |
| INL Grade | 1/2 LSB (B-grade) | 1/2 LSB (B-grade) | 1 LSB (A-grade) | 1 LSB (A-grade) | 1/2 LSB (B-grade) | 1/2 LSB (B-grade) | |
| Input Range | Unipolar 0-5 V / 0-VREF | Unipolar 0-5 V / 0-VREF | Unipolar 0-5 V / 0-VREF | Bipolar +/- 5 V / +/- 10 V | Unipolar 0-5 V / 0-VREF | Unipolar 0-5 V / 0-VREF | |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | |
| Fault Protection | +/- 16.5 V | +/- 16.5 V | +/- 16.5 V | +/- 16.5 V | +/- 16.5 V | +/- 16.5 V | |
| Supply Voltage | Single +5 V | Single +5 V | Single +5 V | Single +5 V | Single +5 V | Single +5 V | |
| Temperature Grade | Commercial | Industrial (extended) | Industrial (extended) | Commercial | Commercial | Commercial |
主要差異化特點
- B-grade 1/2 LSB INL on the same die as the A-grade MAX198AEAI+ (對比MAX198AEAI+)
- Unipolar 0-5 V native range versus bipolar on the MAX196ACAI (對比MAX196ACAI+)
- Integrated fault-protected MUX rated to +/- 16.5 V versus bare ADC inputs on competitors (對比Generic 12-bit SAR ADC without input protection)
- Internal 4.096 V reference with bit-weight-friendly scaling (對比Bare SAR ADC requiring external reference)
設計說明
Place a 10 uF (minimum) tantalum or low-ESR ceramic and a 0.1 uF ceramic bypass capacitor directly at the AVDD and DVDD pins of the MAX198BCAI. Tie AGND and DGND to a single low-impedance ground plane; do not split the ground plane under this part. Because the ADC draws the bulk of its current during conversion, a linear LDO (not a switching regulator) is strongly recommended on the analog rail to avoid switching-noise foldback into the conversion result.
Unused analog input channels on the MAX198BCAI must be tied to AGND (or to any voltage within the allowed input range) rather than left floating. Floating inputs couple charge-injection noise from the internal MUX into adjacent active channels, which can degrade INL by several LSBs on heavily-loaded boards. If a floating channel is intentional, plan to average more samples for that channel or move the MUX to a software-defined ground channel.
Keep the analog input traces short and routed away from the parallel digital bus lines (D0-D11, CS, RD, WR, HBEN). The MAX198BCAI's parallel interface toggles fast edges at 100 ksps; long parallel traces radiate noise back into the analog MUX. Place the part with the analog side facing the field connectors and the digital side facing the microcontroller, and guard the analog traces with a ground fence tied to AGND.
The MAX198BCAI 28-SSOP package benefits from a small copper pour (at least 0.25 sq inch) stitched with vias under and around the part to act as a local ground reference. The exposed pad (if present on the SSOP variant used) should be soldered to the pour to reduce thermal resistance. Although the part is not power-hungry, this also lowers the digital switching-noise injection into the analog ground network.
合規資訊
RoHS-compliant lead-free + suffix variant (MAX198BCAI+) confirmed via Maxim datasheet and distributor listings. Original non-+ MAX198BCAI is the legacy non-RoHS variant. AEC-Q100 not applicable (industrial / commercial grade only; MAX198Q version not in production). Halogen-free status not explicitly listed in the verified data.
