MAX197ACAI+T - 12-Bit 100kSPS DAS, 28-SSOP | Analog Devices
MPN: MAX197ACAI+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $19.95 | $19.95 |
| 10 | $18.4 | $184.00 |
| 100 | $15.85 | $1,585.00 |
| 500 | $13.2 | $6,600.00 |
| 1,000 | $11.05 | $11,050.00 |
MAX197ACAI+T Overview
A DAS (Data Acquisition System) is a mixed-signal integrated circuit that combines analog front-end multiplexing, sample-and-hold buffering, an analog-to-digital converter, and a digital interface into a single device. Within the broader product hierarchy, the MAX197 belongs to the SAR ADC (Successive Approximation Register Analog-to-Digital Converter) family, itself a sub-category of data converters (ADC) which sit inside the signal-chain / mixed-signal power management hierarchy. Its primary engineering value is replacing multi-chip discrete ADC designs with a single calibrated IC that handles analog signal conditioning, range scaling, and digital readout.
Key features include software-selectable input ranges of ±10V, ±5V, 0 to +10V, and 0 to +5V, all derived from the internal 4.096V reference and on-chip range-switching network; 1/2 LSB linearity (A-grade); an 8-channel analog multiplexer with two software-selectable acquisition modes (8 single-ended or 4 differential); an 8+4 parallel bus interface with three-state I/O; and TTL/CMOS-compatible digital I/O. Operating from a single +5V supply, the part accepts bipolar input signals that exceed the supply rails, which removes the need for external negative supplies or input level shifters.
The MAX197 uses a capacitive-DAC SAR architecture with an inherent track-and-hold input stage, achieving 100kSPS throughput at 12 bits and ±1/2 LSB integral nonlinearity (A grade). An internal 4.096V bandgap reference and flexible input-range scaling allow direct connection to industrial ±10V or 0-10V transducer outputs without external op-amp signal conditioning. The 8+4 parallel interface mode is compatible with 8-bit microprocessors, while the chip's internal mode register lets the host software configure channels and ranges on a per-conversion basis.
Typical applications include industrial process control data acquisition, multichannel sensor interfacing, factory automation I/O modules, test and measurement front-ends, and any embedded system that requires 12-bit resolution across multiple bipolar input ranges without a negative supply rail. Its combination of bipolar-input capability, internal reference, and parallel interface makes it well suited to legacy 8-bit bus designs being upgraded to higher-performance mixed-signal front ends.
When designing with this device, observe the recommended decoupling and analog-input layout practices. Place a 0.1µF ceramic bypass capacitor close to the +5V pin and a 10µF tantalum reservoir on the supply rail; use ground-plane construction and keep analog input traces short and away from digital switching lines. Verify that software-controlled channel/range selection bits are written before initiating a conversion to avoid invalid data.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for MAX197ACAI+T — 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 MAX197ACAI+T (same form factor and footprint) — differing in Number of Channels, Operating Temperature, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX197BCAI+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX197AEAI+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX197ACAI+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX197BEAI+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX197ACAI+T Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Resolution | 12 bit |
| Sampling Rate | 100 kSPS |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 8 input channels (8 single-ended or 4 differential) |
| Input Range | ±10V, ±5V, 0 to +10V, 0 to +5V (software-selectable) |
| Supply Voltage | 4.75 V to 5.25 V (single +5V) |
| Linearity (INL/DNL) | ±1/2 LSB (A grade) |
| Input Type | Single-ended / pseudo-differential (software-selectable) |
| Interface | Parallel (8+4 bus, three-state I/O) |
| Reference | Internal 4.096 V bandgap |
| Operating Temperature | 0°C to +70°C (commercial) |
| Package / Case | 28-SSOP (5.30mm width, 0.65mm pitch) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
| Datasheet Document Type | MAX197 product datasheet (analog.com) |
MAX197ACAI+T Pin Configuration
| Pin 1 | CLK — External clock input (or crystal connection) |
| Pin 2 | CS — Chip select (active low) |
| Pin 3 | WR — Write strobe for mode register (active low) |
| Pin 4 | RD — Read strobe (active low) |
| Pin 5 | INT — Conversion complete interrupt (active low) |
| Pin 6 | D7/HBEN — Data bit 7 / High-byte enable |
| Pin 7 | D6 — Data bit 6 |
| Pin 8 | D5 — Data bit 5 |
| Pin 9 | D4 — Data bit 4 |
| Pin 10 | D3 — Data bit 3 |
| Pin 11 | D2 — Data bit 2 |
| Pin 12 | D1 — Data bit 1 |
| Pin 13 | D0 — Data bit 0 (LSB) |
| Pin 14 | GND — Ground (digital) |
| Pin 15 | VDD — +5V supply (digital) |
| Pin 16 | SHDN — Shutdown control (active high) |
| Pin 17 | REFADJ — Reference adjust input |
| Pin 18 | REF — Reference voltage (4.096V) / bypass |
| Pin 19 | AIN0 — Analog input channel 0 |
| Pin 20 | AIN1 — Analog input channel 1 |
| Pin 21 | AIN2 — Analog input channel 2 |
| Pin 22 | AIN3 — Analog input channel 3 |
| Pin 23 | AIN4 — Analog input channel 4 |
| Pin 24 | AIN5 — Analog input channel 5 |
| Pin 25 | AIN6 — Analog input channel 6 |
| Pin 26 | AIN7 — Analog input channel 7 |
| Pin 27 | AGND — Analog ground |
| Pin 28 | AVDD — +5V analog supply |
Typical Applications
MAX197ACAI+T is suitable for 6 applications: Industrial Process Control Data Acquisition, Multichannel Sensor Interface Module, Factory Automation I/O Module, Test and Measurement Front-End, Embedded System Mixed-Signal Front End, Medical Monitoring Equipment.
Industrial Process Control Data Acquisition
The MAX197ACAI+T fits industrial process control data acquisition because its bipolar ±10V/±5V input ranges accept signals from 4-20mA current loops (via shunt resistors), thermocouple amplifiers, and pressure transducers directly without level shifting. Its 8-channel multiplexer and software-selectable per-channel ranges let one chip scan a mixed sensor panel—temperature, pressure, flow—while the single +5V supply simplifies the analog rail. With 12-bit (1/2 LSB A-grade) linearity and 100kSPS throughput, the part provides ~10 ENOB for closed-loop control updates at typical 1-10 kHz loop rates. The 8+4 parallel bus connects directly to legacy 8051-class industrial MCUs that still dominate PLC front-ends.
Recommended
Multichannel Sensor Interface Module
The MAX197ACAI+T is well suited for multichannel sensor interface modules because it integrates 8 input channels, sample-and-hold, 12-bit ADC, and 4.096V reference in one IC. Sensor outputs (load cells, strain gauges, RTD bridges amplified to ±5V or 0-10V) can be wired directly to AIN0-AIN7 without external signal conditioning. The per-channel range selection allows software reconfiguration between differential and single-ended scans, reducing external switch matrix complexity. 100kSPS aggregate throughput supports polling 8 channels at 12.5 kHz each, which is adequate for vibration, position, and slow-dynamic process monitoring. The 28-SSOP package fits 25mm x 15mm daughter boards used inside sensor hubs.
Recommended
Factory Automation I/O Module
Factory automation I/O modules benefit from the MAX197ACAI+T because of its single +5V supply operation and bipolar-input capability, which simplify the backplane power design versus parts that require ±12V or -5V rails. Each I/O module typically scans 8 analog inputs (motor currents, valve positions, supply voltages) at 12-bit resolution; the 8-channel mux eliminates external analog switches. The 8+4 parallel interface connects to industrial MCUs running deterministic control loops at 1-5 kHz update rates, well within the 100kSPS ADC throughput. The 28-SSOP package is widely accepted in PLCC-style industrial form factors and supports conformal coating.
Recommended
Test and Measurement Front-End
The MAX197ACAI+T serves as a 12-bit front-end in bench-top test and measurement instruments because its bipolar ±10V input range matches oscilloscope-style probe outputs and bench multimeter signal levels directly. 100kSPS sampling is suitable for audio-bandwidth signal capture and slow analog signal recording up to 50 kHz. The internal 4.096V reference eliminates external precision reference ICs and trims, reducing BOM cost and calibration time. The 8-channel multiplexer supports 8-input data loggers and multi-channel waveform recorders. The 8+4 parallel interface lets legacy microcontroller-based instruments stream conversion data without DMA complexity.
Recommended
Embedded System Mixed-Signal Front End
Embedded designs built around 8-bit microcontrollers (8051, 68HC11, PIC16/18 families) benefit from the MAX197ACAI+T because of its 8+4 parallel interface, which directly connects to those buses without address/data multiplexing logic. The internal 4.096V reference and software-selectable ranges let one IC handle mixed analog I/O (e.g., 0-5V digital potentiometer wiper voltage plus ±10V load current sense) without external scaling. 12-bit resolution (1/2 LSB A-grade) is adequate for control-loop feedback, instrumentation, and human-interface subsystems. The single +5V supply integrates cleanly with MCU rails.
Recommended
Medical Monitoring Equipment
The MAX197ACAI+T supports medical monitoring equipment (patient monitors, infusion pump controllers, diagnostic peripherals) because of its bipolar-input capability that interfaces directly with biopotential amplifier outputs (ECG, EMG, EEG) operating in the ±5V range. Its 12-bit A-grade linearity provides 1/2 LSB INL, suitable for diagnostic-grade signal capture when paired with appropriate analog front-end filtering. The 8-channel multiplexer scans multiple sensor inputs (heart rate, respiration, SpO2 secondary channels) without external switching. While medical designs typically require additional isolation and IEC 60601 compliance, the MAX197ACAI+T provides the conversion core.
Recommended
Recommended Products Summary
Engineering reference data for MAX197ACAI+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX197BCAI+T | MAX197AEAI+T | MAX197ACAI+ | MAX197BEAI+T |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
| Linearity Grade | A-grade (±1/2 LSB) | B-grade (±1 LSB) | A-grade (±1/2 LSB) | A-grade (±1/2 LSB) | B-grade (±1 LSB) |
| Operating Temperature | 0°C to +70°C | 0°C to +70°C | -40°C to +85°C | 0°C to +70°C | -40°C to +85°C |
| Packaging | Tape & Reel (+T) | Tape & Reel (+T) | Tape & Reel (+T) | Tray/Tube (no T suffix) | Tape & Reel (+T) |
| Input Channels | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential |
| Input Ranges | ±10V, ±5V, 0-10V, 0-5V | ±10V, ±5V, 0-10V, 0-5V | ±10V, ±5V, 0-10V, 0-5V | ±10V, ±5V, 0-10V, 0-5V | ±10V, ±5V, 0-10V, 0-5V |
Key Differentiators
- A-grade linearity (±1/2 LSB) at the standard part number (vs MAX197BCAI+T)
- Bipolar ±10V input from a single +5V supply (vs MAX197ACAI+)
- Commercial 0°C to +70°C temperature grade at standard pricing (vs MAX197AEAI+T)
Design Notes
Decouple the +5V supply with a 0.1µF ceramic capacitor placed within 5mm of the VDD pin (pin 15) and a 10µF tantalum reservoir capacitor on the supply rail. According to the MAX197 datasheet, the analog supply (AVDD, pin 28) and digital supply (VDD, pin 15) should be tied to the same +5V source but use separate traces from the bypass capacitors to minimize digital switching noise coupling into the analog section. Power-supply rejection is approximately 70 dB; clean supply rails directly improve conversion accuracy.
Use a single continuous ground plane with analog ground (AGND, pin 27) and digital ground (GND, pin 14) connected at a single point near the IC, not split. According to standard mixed-signal PCB layout practice, keep analog input traces short, route them away from digital switching lines (D0-D7, CLK, RD, WR), and place the analog input RC anti-alias filter components close to the AIN pins. The exposed pad underneath the SSOP should be soldered to the ground plane for thermal dissipation and reduced ground impedance.
Do not leave unused analog input channels floating; tie them to AGND through a short trace or 10kΩ resistor to prevent charge injection from the multiplexer from generating crosstalk into active channels. According to the MAX197 datasheet, the internal reference (REF, pin 18) requires a 4.7µF bypass capacitor; omitting it degrades linearity and noise. Also note that bit D3 in the mode register (BIP/unipolar) selects bipolar vs unipolar operation per channel; writing an incorrect combination before conversion yields invalid data without raising an error flag.
Compliance Information
RoHS and lead-free per Analog Devices product page. AEC-Q100 not applicable (commercial-grade ADC for industrial / consumer / embedded use). Halogen-free status not explicitly stated in the verified data — set to 'unknown' rather than guessed.
