MAX198AENI - 12-Bit 8-Ch 100ksps ±4.18V DAS | Maxim Integrated
N.º da peça: MAX198AENI ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $17.5 | $17,50 |
| 10 | $15.75 | $157,50 |
| 100 | $13.85 | $1.385,00 |
| 500 | $12.3 | $6.150,00 |
| 1.000 | $10.95 | $10.950,00 |
MAX198AENI Visão geral
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.
Alternativas drop-in para MAX198AENI — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MAX198AENI (mesmo formato e footprint) — diferindo em Architecture, Internal Reference Voltage, Mounting Type, Package, Resolution.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX198BCNI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX198BENI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX198AENI Classificações máximas e características elétricas
| Architecture | Data Acquisition System (DAS) - 8-channel 12-bit ADC |
| Resolução | 12 bits |
| Number of Input Channels | 8 single-ended |
| Conversion Rate | 100 ksps (max) |
| Faixa de tensão de entrada | ±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 |
| Largura do barramento de dados | 12-bit parallel |
| Bus Interface Compatibility | 80C31, 68HC11, TTL/CMOS logic |
| Encapsulamento | 28-pin PDIP (DIP-28, 300 mil) |
| Temperatura de operação | -40 °C to +85 °C |
| Tipo de montagem | Through-Hole |
Configuração de pinos do MAX198AENI
| Pino 1 | VLOGIC — +5 V digital logic supply |
| Pino 2 | D0 — Data bit 0 (LSB, three-state) |
| Pino 3 | D1 — Data bit 1 (three-state) |
| Pino 4 | D2 — Data bit 2 (three-state) |
| Pino 5 | D3 — Data bit 3 (three-state) |
| Pino 6 | D4 — Data bit 4 (three-state) |
| Pino 7 | D5 — Data bit 5 (three-state) |
| Pino 8 | D6 — Data bit 6 (three-state) |
| Pino 9 | D7 — Data bit 7 (three-state) |
| Pino 10 | D8 — Data bit 8 (three-state) |
| Pino 11 | D9 — Data bit 9 (three-state) |
| Pino 12 | D10 — Data bit 10 (three-state) |
| Pino 13 | D11 — Data bit 11 (MSB, three-state) |
| Pino 14 | GND — Digital ground |
| Pino 15 | INT-bar — Conversion complete interrupt (active low) |
| Pino 16 | REF — Internal 4.18 V reference output / external ref input |
| Pino 17 | VDD — +5 V analog supply |
| Pino 18 | VSS — -5 V analog supply (bipolar operation) |
| Pino 19 | AIN0 — Analog input channel 0 |
| Pino 20 | AIN1 — Analog input channel 1 |
| Pino 21 | AIN2 — Analog input channel 2 |
| Pino 22 | AIN3 — Analog input channel 3 |
| Pino 23 | AIN4 — Analog input channel 4 |
| Pino 24 | AIN5 — Analog input channel 5 |
| Pino 25 | AIN6 — Analog input channel 6 |
| Pino 26 | AIN7 — Analog input channel 7 |
| Pino 27 | CLK — External clock input (or internal RC) |
| Pino 28 | RD-bar — Read-bar input, starts conversion on falling edge, three-states data bus |
Aplicações típicas
MAX198AENI é adequado para 6 aplicaçãos: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX198AENI — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- Higher-grade B variant offers tighter linearity (vs MAX198BCNI+)
- Surface-mount package variant for compact boards (vs MAX198AEWI+)
- Drop-in PDIP-28 upgrade with tighter linearity (vs MAX198BENI+)
Notas de projeto
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.
Informações de conformidade
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).
