MAX198ACNI - 12-Bit 6-Ch 100ksps ADC | Maxim | Multi-Range
MPN: MAX198ACNI ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.8 | $9,800.00 |
MAX198ACNI Overview
An ADC (analog-to-digital converter) is a mixed-signal data converter that translates real-world analog voltages into a digital code for processing by microcontrollers, DSPs, or FPGAs. As a multi-range SAR ADC, the MAX198ACNI uses a charge-redistribution DAC and comparator to perform a 12-bit conversion in under 10 µs, balancing speed, accuracy, and simplicity. Its place in the broader taxonomy: ADC -> data converter -> mixed-signal IC -> power management / signal chain. The internal reference and rugged bipolar input structure simplify signal conditioning for industrial control loops.
Key features include six analog input channels multiplexed to a single 12-bit ADC core, eight software-programmable input ranges, an internal 4.096 V reference, a three-state parallel digital interface compatible with 16-bit data buses, and TTL/CMOS-compatible logic levels. The 100 ksps throughput makes it suitable for closed-loop control and instrumentation sampling. Power dissipation is approximately 60 mW during continuous conversion and drops to under 1 mW in software-controlled power-down mode, which is valuable for battery-portable instrumentation.
Typical applications include multi-channel industrial process-control data acquisition, programmable-logic controller (PLC) analog input modules, medical instrumentation signal conditioning, automated test equipment (ATE) front-ends, and embedded sensor-interface boards. The multi-range input allows direct connection to 4-20 mA current-loop receivers (with a sense resistor), thermocouple amplifiers, and strain-gauge bridges.
When designing with the MAX198ACNI, bypass VDD and VSS pins with 0.1 µF and 10 µF capacitors placed within 5 mm of the device, route analog and digital grounds separately back to a star-point ground, and ensure the input signal does not exceed ±16 V absolute maximum to avoid input-protection diode conduction. The 'A' grade provides ±0.5 LSB INL and the 'C' suffix denotes the commercial 0 °C to +70 °C operating range.
This page synthesizes real distributor stock, parametric drop-in alternatives, and PCB design guidance not found in the bare Maxim datasheet.
Drop-in alternatives for MAX198ACNI — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MAX198ACNI (same form factor and footprint) — differing in Package, Mounting Type, Analog Supply Voltage, Architecture, Digital Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX196ACAI
✅ Drop-In✓ In Stock
$35.12 / Unit
View Datasheet →MAX197ACNI
✅ Drop-In📋 Reference alternative (not in catalog)
MAX198AENI
✅ Drop-In✓ In Stock
$10.95 / Unit
View Datasheet →MAX198BCNI
✅ Drop-In📋 Reference alternative (not in catalog)
MAX190BCWG+T
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.15 / Unit
View Datasheet →MAX198ACNI Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices (formerly Maxim Integrated) |
| Product Type | Data Acquisition System (DAS) / Multi-Channel SAR ADC |
| Resolution | 12 bit |
| Number of Channels | 6 single-ended or 3 differential |
| Sampling Rate | 100 ksps |
| Architecture | SAR (Successive Approximation Register) |
| Supply Voltage | +5 V single supply |
| Analog Input Range (MAX198) | 0 to 10 V / 0 to 5 V / ±10 V / ±5 V / 0 to 4 V / ±4 V (software programmable) |
| Digital Interface | Parallel, 8/16-bit bus compatible, three-state I/O |
| Logic Compatibility | TTL/CMOS |
| Internal Reference Voltage | 4.096 V |
| Integral Non-Linearity (INL) | ±0.5 LSB (A grade) |
| Power Dissipation (active) | 60 mW typical |
| Power Dissipation (power-down) | < 1 mW |
| Operating Temperature Range | 0 °C to +70 °C (C suffix, commercial) |
| Package | 28-pin PDIP (N) |
| Mounting Type | Through-Hole (THT) |
| MSL Level | 1 (unlimited) |
MAX198ACNI Pin Configuration
| Pin 1 | AIN0 — Analog Input Channel 0 |
| Pin 2 | AIN1 — Analog Input Channel 1 |
| Pin 3 | AIN2 — Analog Input Channel 2 |
| Pin 4 | AIN3 — Analog Input Channel 3 |
| Pin 5 | VREF — Internal 4.096 V Reference Voltage |
| Pin 6 | REFADJ — Reference Adjust |
| Pin 7 | VDD — +5 V Power Supply |
| Pin 8 | VSS — Digital Ground |
| Pin 9 | CLK — External Clock Input |
| Pin 10 | CS — Chip Select (active low) |
| Pin 11 | RD — Read Strobe (active low) |
| Pin 12 | WR — Write Strobe (active low) |
| Pin 13 | HBEN — High Byte Enable |
| Pin 14 | INT — Interrupt / Conversion End |
| Pin 15 | D7/MSB — Data Bit 7 / MSB |
| Pin 16 | D6 — Data Bit 6 |
| Pin 17 | D5 — Data Bit 5 |
| Pin 18 | D4 — Data Bit 4 |
| Pin 19 | D3 — Data Bit 3 |
| Pin 20 | D2 — Data Bit 2 |
| Pin 21 | D1 — Data Bit 1 |
| Pin 22 | D0/LSB — Data Bit 0 / LSB |
| Pin 23 | D11 — Data Bit 11 (MSB when HBEN high) |
| Pin 24 | D10 — Data Bit 10 |
| Pin 25 | D9 — Data Bit 9 |
| Pin 26 | D8 — Data Bit 8 |
| Pin 27 | VSS — Analog Ground |
| Pin 28 | AIN4/AIN5 — Analog Input Channels 4 and 5 (shared pin per datasheet) |
Typical Applications
MAX198ACNI is suitable for 6 applications: Multi-Channel Industrial Process Control DAS, PLC Analog Input Module, Medical Instrumentation Signal Acquisition, Automated Test Equipment (ATE) Front-End, Embedded Multi-Sensor Data Acquisition Board, Data Logging and Industrial Recorder Front-End.
Multi-Channel Industrial Process Control DAS
The MAX198ACNI fits multi-channel industrial process-control data acquisition because its six single-ended (or three differential) 12-bit channels and software-programmable input ranges (0-10 V, ±10 V, 4-20 mA loop) eliminate the need for external signal-conditioning scaling. With 100 ksps throughput and ±0.5 LSB INL on the 'A' grade, the device captures fast control-loop feedback from multiple sensors simultaneously. The 28-pin PDIP package remains convenient for prototype and pilot-line PLC/DAQ modules that prefer through-hole soldering.
Recommended
PLC Analog Input Module
Programmable Logic Controllers (PLCs) require multi-range analog input cards that accept industrial 0-10 V or 4-20 mA signals. The MAX198ACNI directly interfaces to these signal levels via internal range switching, removing external op-amp signal-conditioning stages and reducing BOM cost. Its parallel 8/16-bit bus interface is compatible with most popular microcontrollers used in PLC backplanes. The internal 4.096 V reference and 12-bit resolution meet the ±0.5% full-scale accuracy typical of industrial control modules.
Recommended
Medical Instrumentation Signal Acquisition
Medical instrumentation front-ends (patient monitors, ECG/bio-signal acquisition boards) benefit from the MAX198ACNI's six multiplexed channels and ±0.5 LSB linearity to digitize multiple physiological signals from a single IC. The single +5 V supply simplifies battery-power designs for portable medical devices, and the <1 mW power-down mode supports duty-cycled battery-life extension. Input ranges up to ±4 V (MAX198) accommodate amplified bioelectric signals without saturating the converter.
Recommended
Automated Test Equipment (ATE) Front-End
Automated Test Equipment requires a flexible multi-channel ADC that can digitize mixed-voltage signals from device-under-test (DUT) pins. The MAX198ACNI's software-selectable input ranges (0-10 V, 0-5 V, ±10 V, ±5 V, 0-4 V, ±4 V) cover the common logic-level and analog-voltage test points without external attenuators. Its 100 ksps throughput supports bench-test parametric measurement units (PMUs) and production-test handlers, and its parallel bus enables fast data transfer to the ATE controller.
Recommended
Embedded Multi-Sensor Data Acquisition Board
Embedded sensor-interface boards (IoT edge devices, agricultural/environmental sensors, robotics) often digitize analog outputs from temperature, pressure, and position sensors simultaneously. The MAX198ACNI's six channels and software-programmable ranges allow direct connection to thermocouples (with external cold-junction compensation), strain gauges, and 4-20 mA industrial sensors. The internal reference simplifies BOM and the 28-pin PDIP package suits hand-soldered prototyping on 0.1-inch pitch development boards.
Recommended
Data Logging and Industrial Recorder Front-End
Portable and rack-mounted data loggers digitize analog inputs from pressure transducers, flow meters, and analog instrumentation. The MAX198ACNI's six channels multiplexed to a single 12-bit core provide enough density for multi-parameter logging while keeping the BOM minimal. Software-controlled ranges allow configuring the logger for different sensor types via firmware, without hardware modification. The 100 ksps sampling supports high-bandwidth vibration or transient-event recording.
Recommended
Recommended Products Summary
Engineering reference data for MAX198ACNI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX196ACAI | MAX197ACNI | MAX198AENI | MAX198BCNI | MAX190BCWG |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) |
| Package | 28-pin PDIP (N) | 28-pin PDIP - same | 28-pin PDIP - same | 28-pin PDIP - same | 28-pin PDIP - same | 28-pin PDIP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Number of Channels | 6 | 6 | 8 | 6 | 6 | 1 |
| Sampling Rate | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 76 ksps |
| Input Range | 0-10 V / 0-5 V / ±10 V / ±5 V / 0-4 V / ±4 V | ±10 V (MAX196 variant) | 0-10 V / ±5 V / ±10 V (8-ch) | Same as MAX198 (E = industrial temp) | Same as MAX198 (B = ±1 LSB INL) | 0-5 V single channel |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Operating Temperature | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) |
Key Differentiators
- True 6-channel multiplexed SAR architecture in 28-pin PDIP (vs MAX190BCWG)
- Software-programmable multi-range inputs eliminate external scaling (vs MAX190BCWG)
- Higher sampling rate than MAX190 family (vs MAX190BCWG)
- 6 channels in 28-pin PDIP vs MAX197's 8 channels (vs MAX197ACNI)
Design Notes
Estimated: bypass VDD (pin 7) and VSS (pin 8, pin 27) within 5 mm of the device with a 0.1 µF ceramic in parallel with a 10 µF tantalum or ceramic bulk capacitor. Route analog and digital grounds on separate planes back to a single star-point ground beneath the IC. Place the MAX198ACNI away from switching regulators and clock lines; its 12-bit / 100 ksps performance is sensitive to digital-noise coupling on VDD and VREF.
Keep analog input traces short and guarded with a ground-fill on both sides; route them away from digital data-bus traces (D0-D11). The internal 4.096 V reference (pin 5) requires a low-ESR bypass capacitor (typically 4.7 µF to 10 µF) for stable operation. The MAX198's ±4 V max input range means external op-amp buffers are needed for signals above ±4 V (use the MAX196 family for ±10 V direct input). Add 100 Ω series resistors on analog inputs if the source impedance exceeds 5 kΩ.
Do not exceed the absolute-maximum analog input voltage of ±16 V, or the internal input-protection diodes will conduct and potentially damage the device. The CS, RD, and WR control lines must be properly sequenced per the datasheet timing diagram - read operations require CS low + RD low; write operations require CS low + WR low. The HBEN pin selects between 8-bit (HBEN low) and 12-bit (HBEN high) data-bus modes - misconfiguring this results in shifted data reads.
Estimated: the MAX198ACNI in 28-pin PDIP dissipates approximately 60 mW during continuous conversion, which translates to less than 2 °C junction-temperature rise in still air at 25 °C ambient. The plastic PDIP package is adequate for commercial temperature operation without a heatsink. For the industrial temperature variant (MAX198AENI), verify junction temperature does not exceed +125 °C in worst-case ambient conditions, but with only 60 mW typical dissipation, thermal derating is rarely a concern.
Compliance Information
The CNI suffix denotes 28-pin PDIP (commercial, 0-70 °C). The original Maxim datasheet predates modern RoHS documentation; RoHS/REACH compliance must be confirmed with the distributor for the specific date code and lot. The MAX198ACNI is a commercial-grade ADC and is not AEC-Q100 qualified - use MAX198AENI for industrial temperature grade. Conflict-mineral declaration per Analog Devices corporate policy is compliant.