MAX198AENI - 12-Bit 8-Ch 100ksps ±4.18V DAS | Maxim Integrated
MPN: MAX198AENI ✓ Hoạt độngMAX198AENI Tóm tắt
A Data Acquisition System (DAS) is a mixed-signal integrated circuit that combines an analog-to-digital converter (ADC), input multiplexer, sample-and-hold, reference, and bus interface in one package. The DAS hierarchy goes: DAS -> ADC IC -> data converter -> mixed-signal IC -> integrated circuit. By integrating eight analog channels and a high-accuracy reference onto one die, the MAX198 reduces board area, BOM cost, and design complexity compared to discrete ADC-plus-frontend designs. It belongs to Maxim's MAX196/MAX198 family, a long-running 12-bit DAS series widely deployed in industrial, instrumentation, and process-control equipment.
Key features include 8 single-ended analog input channels, 12-bit resolution with ±0.5 LSB (max) relative accuracy, ±4.18 V bipolar input range, and 100 ksps sampling rate. The MAX198AENI supports 2.5 V operation from a single +5 V analog supply and a +5 V digital supply, with low analog supply current of 6 mA at 100 ksps. Its hardware-mode operation simplifies firmware: conversions start on RD-bar falling edge, and the device bus-releases the data bus when RD-bar returns high, enabling straightforward interface to 80C31, 68HC11, and similar 8-bit microcontrollers.
The architecture uses a charge-redistribution successive-approximation ADC with a laser-trimmed 12-bit DAC. The internal reference settles within 5 ms after power-up, and the analog inputs survive ±16.5 V overvoltage without damage. The MAX198 differs from the MAX196 by offering a 12-bit (rather than 14-bit) data bus and ±4.18 V input range rather than the 0 to 5 V / ±5 V ranges of related parts.
Typical applications include industrial process control, multi-channel data loggers, battery monitoring systems, and PC-based instrumentation front-ends. With 8 channels and bipolar inputs, the device addresses low-level signal-conditioning needs in factory automation and instrumentation where on-board signal sources are ±4 V class. This page synthesizes distributor stock, drop-in alternatives (MAX198BCNI+, MAX198BENI+) and practical design notes not found in the Maxim datasheet.
Bộ thay thế dễ dàng lắp đặt cho MAX198AENI — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX198AENI (cùng hình factor và footprint) — khác nhau ở Architecture, Internal Reference Voltage, Mounting Type, Package, Resolution.
MAX198BCNI+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX198BENI+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX198AENI Tỷ lệ tối đa & tính chất điện
| Architecture | Data Acquisition System (DAS) - 8-channel 12-bit ADC |
| Độ phân giải | 12 bits |
| Number of Input Channels | 8 single-ended |
| Conversion Rate | 100 ksps (max) |
| Phạm vi điện áp đầu vào | ±4.18 V (bipolar) |
| Analog Supply Voltage | ±5 V (single +5 V supply) |
| Digital Supply Voltage | +5 V |
| Analog Supply Current | 6 mA at 100 ksps |
| Internal Reference Voltage | 4.18 V ±1% |
| Reference Drift | 35 ppm/°C |
| Relative Accuracy (INL) | ±0.5 LSB (max) |
| Overvoltage Protection | ±16.5 V |
| Bề rộng đường dữ liệu | 12-bit parallel |
| Bus Interface Compatibility | 80C31, 68HC11, TTL/CMOS logic |
| Hộp | 28-pin PDIP (DIP-28, 300 mil) |
| Nhiệt độ hoạt động | -40 °C to +85 °C |
| Kiểu lắp đặt | Through-Hole |
Cấu hình chân MAX198AENI
| Chân 1 | VLOGIC — +5 V digital logic supply |
| Chân 2 | D0 — Data bit 0 (LSB, three-state) |
| Chân 3 | D1 — Data bit 1 (three-state) |
| Chân 4 | D2 — Data bit 2 (three-state) |
| Chân 5 | D3 — Data bit 3 (three-state) |
| Chân 6 | D4 — Data bit 4 (three-state) |
| Chân 7 | D5 — Data bit 5 (three-state) |
| Chân 8 | D6 — Data bit 6 (three-state) |
| Chân 9 | D7 — Data bit 7 (three-state) |
| Chân 10 | D8 — Data bit 8 (three-state) |
| Chân 11 | D9 — Data bit 9 (three-state) |
| Chân 12 | D10 — Data bit 10 (three-state) |
| Chân 13 | D11 — Data bit 11 (MSB, three-state) |
| Chân 14 | GND — Digital ground |
| Chân 15 | INT-bar — Conversion complete interrupt (active low) |
| Chân 16 | REF — Internal 4.18 V reference output / external ref input |
| Chân 17 | VDD — +5 V analog supply |
| Chân 18 | VSS — -5 V analog supply (bipolar operation) |
| Chân 19 | AIN0 — Analog input channel 0 |
| Chân 20 | AIN1 — Analog input channel 1 |
| Chân 21 | AIN2 — Analog input channel 2 |
| Chân 22 | AIN3 — Analog input channel 3 |
| Chân 23 | AIN4 — Analog input channel 4 |
| Chân 24 | AIN5 — Analog input channel 5 |
| Chân 25 | AIN6 — Analog input channel 6 |
| Chân 26 | AIN7 — Analog input channel 7 |
| Chân 27 | CLK — External clock input (or internal RC) |
| Chân 28 | RD-bar — Read-bar input, starts conversion on falling edge, three-states data bus |
Ứng dụng tiêu biểu
MAX198AENI phù hợp cho 6 Áp dụngs: Industrial Process Control, Multi-Channel Data Logger, PC-Based Instrumentation Front End, Battery Cell Monitoring, Medical Monitoring and Diagnostic Equipment, Test Equipment and Benchtop Instrumentation.
Industrial Process Control
The MAX198AENI suits industrial process control because it integrates 8 single-ended analog channels with ±4.18 V bipolar input and a factory-trimmed 4.18 V reference on a single IC, eliminating external signal-conditioning for many PLC and DCS analog front ends. Eight channels let one MAX198AENI digitize thermocouple-amplifier outputs, pressure transducers, and 4-20 mA-shunt voltages simultaneously, while its 100 ksps rate handles multichannel multiplexing without aliasing in slow process loops. The ±16.5 V overvoltage tolerance survives 24 V field-wiring transients common in factories, and 6 mA analog supply current keeps dissipation modest in DIN-rail backplanes. Hardware-mode read timing simplifies interface to legacy industrial microcontrollers like 80C31/80C51 with no firmware-driven conversion start.
Được đề xuất
Multi-Channel Data Logger
The MAX198AENI is well-suited for battery-powered multi-channel data loggers because its 6 mA analog supply current at 100 ksps keeps average power low in duty-cycled logging applications. With 8 single-ended inputs, a complete 8-parameter data-acquisition card fits in one DIP-28 socket, reducing BOM count to about 10 parts (analog input dividers, bypass caps, decoupling, MCU). The internal 4.18 V reference is factory-trimmed to ±1%, so external references are unnecessary for 12-bit accuracy, saving power and board space. The hardware-mode read-cycle operation lets the logger's microcontroller enter sleep between conversions, awakening only to read one frame of 12-bit data via bus release on RD-bar rising. The ±16.5 V overvoltage protection prevents damage from sensor miswiring during field deployment.
Được đề xuất
PC-Based Instrumentation Front End
For PC-based instrumentation and ISA/PCI data-acquisition cards, the MAX198AENI's 12-bit parallel bus interface, hardware-mode timing, and 100 ksps rate align with ISA-bus DMA transfer speeds and PnP enumeration patterns. The 8 channels give a 19-slot ISA card 16 differential/8 single-ended channels using two MAX198AENIs with no FPGA needed for timing, since conversions trigger on RD-bar falling edge and data is valid by the access-time deadline. The 4.18 V internal reference trims to ±1%, so calibration software in the host driver compensates for full-scale and offset. ±16.5 V overvoltage tolerance lets the card share connector backplanes with motor-control outputs without damage during prototype bring-up.
Được đề xuất
Battery Cell Monitoring
The MAX198AENI handles multi-cell battery monitoring by digitizing up to 8 cell voltages (each at ±4.18 V full scale) via single-ended channels while the internal 4.18 V reference serves as the ADC reference. With 12-bit resolution, each channel resolves ~2 mV per LSB (4.18 V / 4096 ≈ 1.02 mV/bit), sufficient for state-of-charge estimates on Li-ion cells. The 100 ksps rate samples 8 cells at 12.5 kHz, well above the fastest cell-balancing-control loop, leaving headroom for advanced multiplexing. ±16.5 V overvoltage tolerance is critical for handling transient voltages during cell-switching events. The 28-pin PDIP footprint keeps battery-management boards easy to prototype and modify.
Được đề xuất
Medical Monitoring and Diagnostic Equipment
In medical monitoring equipment like patient-side ECG/blood-pressure modules, the MAX198AENI provides 8 single-ended analog inputs for digitizing electrode amplifier outputs, temperature sensors, and flow-meter transducers simultaneously at 100 ksps aggregate. The internal 4.18 V reference trims to ±1% and tracks at 35 ppm/°C max, sufficient for long-term calibration stability in clinical settings. The 12-bit/100ksps rate captures ECG waveforms at 12.5 ksps per channel with comfortable margin for higher-frequency transients. Hardware-mode read timing enables low-latency interrupt-driven reading with no firmware overhead, critical for alarm latency in patient monitoring. ±16.5 V overvoltage tolerance protects against defibrillator discharge transients on adjacent connectors.
Được đề xuất
Test Equipment and Benchtop Instrumentation
The MAX198AENI addresses test-equipment and benchtop instrumentation with 8 simultaneously accessible analog channels and ±4.18 V bipolar input, ideal for digitizing signals from bench multimeters, arbitrary waveform generator outputs, or transducer test fixtures. The hardware-mode timing allows one RTOS-driven control loop to acquire 8 channels in a tight 80 µs window (8 × 10 µs at 100 ksps), well matched to PC-based bench data displays. The 28-pin PDIP package simplifies hand-prototype rework and pin-drivers, key features in lab environments where engineers swap parts by hand. The 4.18 V internal reference trims to ±1% for repeatable measurements, and external buffering is unnecessary because the device drives up to 5 mA of bus capacitance for reliable 80-series microprocessor interface timing.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX198AENI — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MAX198BCNI+ | MAX198BENI+ | MAX198AEWI+ |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | PDIP-28 (300 mil) | PDIP-28 (300 mil) | PDIP-28 (300 mil) | Wide SO-28 (surface mount) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits |
| Input Channels | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended |
| Sample Rate | 100 ksps | 100 ksps | 100 ksps | 100 ksps |
| Input Voltage Range | ±4.18 V | ±4.18 V | ±4.18 V | ±4.18 V |
| Internal Reference | 4.18 V ±1% | 4.18 V ±1% | 4.18 V ±1% | 4.18 V ±1% |
| INL (Relative Accuracy) | ±0.5 LSB (A grade) | ±0.5 LSB (B grade tighter) | ±0.5 LSB (B grade tighter) | ±0.5 LSB (A grade) |
| Mounting Type | Through-hole (PDIP) | Through-hole | Through-hole | Surface mount |
Bảo phân biệt quan trọng
- Higher-grade B variant offers tighter linearity (vsMAX198BCNI+)
- Surface-mount package variant for compact boards (vsMAX198AEWI+)
- Drop-in PDIP-28 upgrade with tighter linearity (vsMAX198BENI+)
Ghi chú thiết kế
Decouple the +5 V analog supply (VDD, pin 17) with a 10 µF tantalum and 0.1 µF ceramic placed within 5 mm of the VDD pin, and the VLOGIC supply (pin 1) with separate 1 µF and 0.1 µF capacitors tied between pin 1 and digital ground. The -5 V VSS supply (pin 18) supplies the bipolar input signal path; bypass it with a 1 µF/0.1 µF pair to analog ground. Sharing VSS and VDD return paths through ground noise can dominate ADC error, so star-route VSS, VDD, and GND at one point.
Route analog input traces (AIN0-AIN7) away from the digital bus DB0-DB11 and the clock pin. Keep the analog input trace length under 50 mm and use a guard trace or ground pour to limit digital-noise coupling. Place a 100 Ω series resistor and 100 pF shunt capacitor on each analog input if signal sources are piezoelectric or other high-impedance transducers, to damp high-frequency resonance that alias signals into the conversion bandwidth at 100 ksps.
Do not exceed ±16.5 V on any analog input pin while the device is powered; sustained overvoltage without current limiting can damage the input multiplexer. The 4.18 V internal reference is shared with the analog front-end - if you plan to feed an external reference, let REF settle for 5 ms after power-up and buffer it with an op-amp if multiple loads are connected. RD-bar falling edge begins the conversion; hold RD-bar low until INT-bar falls or count to ~10 µs to guarantee conversion completion at 100 ksps.
Thông tin tuân thủ
Lead-free per Maxim/Analog Devices product marking; RoHS/REACH status not explicitly listed in scraped product pages - confirm on analog.com compliance statement. AEC-Q100 not applicable (industrial/consumer grade).
