MAX199BEAI - 12-Bit 8-Channel +5V Multi-Range DAS | Maxim Integrated
MPN: MAX199BEAI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $22.5 | $22.50 |
| 10 | $20.85 | $208.50 |
| 100 | $18.4 | $1,840.00 |
| 500 | $16.2 | $8,100.00 |
| 1,000 | $14.95 | $14,950.00 |
MAX199BEAI Overview
A multi-range DAS is a category of mixed-signal data-acquisition IC that combines channel scanning, input signal conditioning, sample-and-hold, and analog-to-digital conversion in a single package. The hierarchy is: DAS -> mixed-signal IC -> data converter -> analog frontend. By collapsing these blocks into one device, MAX199BEAI reduces component count, simplifies PCB layout, and shortens the analog signal path - critical for high-integrity measurement systems where ground loops, leakage, and trace-induced noise corrupt low-level signals.
Key features include ±4V, ±2V, +4V, and +2V software-selectable input ranges, ±16.5V overvoltage fault protection on each analog input, an internal 4.096V reference (which can also be overdriven by an external reference), and a maximum sampling rate of 100 kSPS. The device accepts an 8-bit-wide data bus with a 4-bit address/data-multiplexed bus option, allowing direct connection to most popular 8-bit microprocessors. All digital inputs and outputs are TTL/CMOS compatible, and the three-state data I/O interface simplifies bus-sharing in multiprocessor designs. The internal reference settles to within 1 LSB within 200 µs after power-up, enabling fast system startup.
Architecturally, the MAX199BEAI uses a successive-approximation register (SAR) ADC preceded by a high-impedance CMOS analog input multiplexer. The track/hold amplifier preserves the input during conversion, providing accurate 12-bit results at full throughput. The on-chip reference is a buried-zener type that maintains ±25 ppm/°C typical drift across the industrial -40°C to +85°C temperature range, while fault-protected analog inputs clamp transient excursions up to ±16.5V without damage.
Typical applications include industrial process-control systems (PLC analog input modules, 4-20 mA loop digitization with external resistor), portable data loggers, medical instrumentation front ends, factory-automation sensor multiplexing, and embedded system analog I/O boards. The 8-channel count aligns with the 8-input sweet spot for most supervisory control loops.
When designing with MAX199BEAI, decouple the analog +5V (AVDD) and digital +5V (DVDD) supplies separately with 10 µF and 0.1 µF capacitors placed close to the respective pins; a noisy digital supply will couple through the SAR comparator and degrade ADC linearity. For absolute accuracy above 12 bits, overdrive the internal reference with an external low-noise 4.096V source. Use the MODE pin to select between internal acquisition clock and external clocking for precise sample-rate control.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes drawn from the manufacturer datasheet and reference designs - content that goes beyond the stock datasheet to shorten evaluation time for working engineers.
Drop-in alternatives for MAX199BEAI — 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 MAX199BEAI (same form factor and footprint) — differing in Input Overvoltage Protection, Logic Compatibility, Package, Resolution, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX199BEAI+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX199AEAI+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX199BEAI-T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX197BEAI
✅ Drop-In📋 Reference alternative (not in catalog)
MAX196AEAI
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$21.5 / Unit
View Datasheet →MAX194ACPE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX199BEAI Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Number of Analog Input Channels | 8 |
| Input Voltage Ranges | ±4 V, ±2 V, +4 V, +2 V (software-selectable) |
| Sampling Rate | 100 kSPS |
| Supply Voltage | +5 V single supply |
| Input Overvoltage Protection | ±16.5 V (any channel, with power on or off) |
| Internal Reference Voltage | 4.096 V |
| External Reference Input | Yes (can overdrive internal reference) |
| Digital Interface | 8-bit three-state data bus with 4-bit address/data-multiplexed option (8+4) |
| Logic Compatibility | TTL/CMOS compatible inputs and outputs |
| Conversion Architecture | SAR (successive approximation) with track/hold |
| Operating Temperature | -40 °C to +85 °C (industrial, E suffix) |
| Package | 28-pin SSOP |
| Mounting Type | Surface Mount |
MAX199BEAI 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 | AIN4 — Analog input channel 4 |
| Pin 6 | AIN5 — Analog input channel 5 |
| Pin 7 | AIN6 — Analog input channel 6 |
| Pin 8 | AIN7 — Analog input channel 7 |
| Pin 9 | AGND — Analog ground |
| Pin 10 | AVDD — Analog +5 V supply |
| Pin 11 | REF — Reference voltage (internal 4.096 V or external overdrive) |
| Pin 12 | RANGE — Input range select (logic level sets ±4 V/±2 V/+4 V/+2 V) |
| Pin 13 | MODE — Conversion clock mode select (internal/external) |
| Pin 14 | WR — Write strobe (active low) |
| Pin 15 | RD — Read strobe (active low) |
| Pin 16 | CS — Chip select (active low) |
| Pin 17 | INT — Interrupt output (active low, end-of-conversion) |
| Pin 18 | D0/D8 — Data bit 0 (or address bit 0 in 8+4 mode) |
| Pin 19 | D1/D9 — Data bit 1 (or address bit 1 in 8+4 mode) |
| Pin 20 | D2/D10 — Data bit 2 (or address bit 2 in 8+4 mode) |
| Pin 21 | D3/D11 — Data bit 3 (or address bit 3 in 8+4 mode) |
| Pin 22 | D4 — Data bit 4 |
| Pin 23 | D5 — Data bit 5 |
| Pin 24 | D6 — Data bit 6 |
| Pin 25 | D7 — Data bit 7 (MSB in 8-bit mode; MSB in 12-bit mode) |
| Pin 26 | CLK — External conversion clock input (when MODE selects external clock) |
| Pin 27 | DGND — Digital ground |
| Pin 28 | DVDD — Digital +5 V supply |
Typical Applications
MAX199BEAI is suitable for 6 applications: PLC Analog Input Module, Portable Data Logger, Medical Instrumentation Front End, Factory Automation Sensor Multiplexer, Embedded System Analog I/O Board, Test and Measurement Front Panel.
PLC Analog Input Module
The MAX199BEAI fits PLC analog input modules because it provides eight single-ended channels at 100 kSPS - matching the 8-channel format used by most PLC backplanes and 4-20 mA loop digitizers. With ±16.5 V input fault protection, miswired field wiring will not destroy the IC even with the 24 V common-mode transients found on factory floors. Use external 250 Ω sense resistors to convert 4-20 mA loops into 1-5 V, then range-select the MAX199 to the 0-4 V or ±4 V input. The 8+4 bus interface connects directly to an 8-bit microcontroller without external logic, minimizing BOM cost per channel.
Recommended
Portable Data Logger
For battery-powered or portable data loggers, the MAX199BEAI's single +5 V supply and 8-channel MUX let one IC capture all thermocouple, RTD, or strain-gauge channels without external signal conditioning. The internal 4.096 V reference can be overdriven with an external low-drift reference for 12-bit absolute accuracy. Place the device in power-down mode between conversions to extend battery life; wake on a microcontroller GPIO to perform a single-shot conversion. The SSOP-28 footprint keeps the analog section compact - critical when the logger enclosure is hand-held sized.
Recommended
Medical Instrumentation Front End
The MAX199BEAI suits medical instrumentation front ends such as patient monitors and benchtop diagnostic analyzers, where multiple sensors (ECG leads, SpO2, temperature, pressure) must be sampled synchronously. Its ±16.5 V input protection and 12-bit resolution cover the dynamic range of most clinical signals after appropriate front-end amplification. The track/hold front-end preserves phase between multiplexed channels - important for multi-lead ECG. The internal 4.096 V reference provides a stable ratiometric basis when used with matching excitation sources.
Recommended
Factory Automation Sensor Multiplexer
In factory automation, the MAX199BEAI acts as a centralized ADC for up to eight 0-10 V or 4-20 mA sensors routed through a multiplexer to a single host controller. Its software-selectable input ranges mean a single PCB can accept 0-2 V, 0-4 V, ±2 V, and ±4 V sensor outputs without hardware changes - just register writes. The 100 kSPS throughput handles up to 12.5 kSPS per channel when scanning all eight - well above the bandwidth of typical temperature, pressure, and flow sensors.
Recommended
Embedded System Analog I/O Board
The MAX199BEAI is a natural fit for embedded system analog I/O boards built around 8-bit microcontrollers (8051, HC11, PIC, AVR). The 8+4 bus interface connects directly to the MCU data bus with a single read/write cycle, and the TTL/CMOS-compatible I/O removes the need for level translation. The internal reference eliminates the need for an external precision reference for general-purpose 12-bit applications, simplifying BOM and PCB layout.
Recommended
Test and Measurement Front Panel
Benchtop test and measurement equipment - multimeter front ends, calibrators, and scanner mainframes - benefits from the MAX199BEAI's 12-bit resolution, 8 channels, and fault-protected inputs. The internal reference settles quickly at power-up, supporting fast warm-up requirements. Pin compatibility with the MAX197 allows the same front-end PCB to be built for either ±4 V or ±10 V input ranges by simply sourcing the appropriate IC variant, reducing SKUs in production.
Recommended
Recommended Products Summary
Engineering reference data for MAX199BEAI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX199BEAI+ | MAX199AEAI+ | MAX199BEAI-T | MAX197BEAI | MAX196AEAI |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-pin SSOP | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Channels | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended / 4 differential |
| Input Voltage Range | ±4 V, ±2 V, +4 V, +2 V | ±4 V, ±2 V, +4 V, +2 V | ±4 V, ±2 V, +4 V, +2 V | ±4 V, ±2 V, +4 V, +2 V | ±10 V, ±5 V, +10 V, +5 V | ±10 V only |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Grade / Linearity Tier | B grade (tighter linearity) | B grade | A grade (lower linearity) | B grade | B grade | A grade |
Key Differentiators
- Pin-compatible with MAX197 for ±10 V upgrade path (vs MAX197BEAI)
- Higher linearity (B grade) than A-grade alternative (vs MAX199AEAI+)
- Industrial temperature range (-40°C to +85°C) (vs MAX199CEAI)
Design Notes
Separate the analog +5 V (AVDD) and digital +5 V (DVDD) supplies with independent ferrite beads or pi filters, and decouple each with a 10 µF tantalum + 0.1 µF ceramic placed as close as possible to the respective pins. The SAR ADC comparator is sensitive to DVDD noise - a noisy digital rail couples directly into conversion results and degrades effective resolution. AGND and DGND should join at a single point near the IC (star ground).
Route analog input traces (AIN0-AIN7) over a continuous analog ground plane, away from digital bus traces and clock lines. The MAX199's input impedance and 12-bit resolution make it sensitive to trace-induced offsets; keep analog traces short, matched in length for simultaneous sampling, and guard with ground pours on adjacent layers. Keep the REF pin trace short and surrounded by ground to avoid reference noise pickup that propagates straight into conversion results.
Do not leave unused analog inputs floating - tie them to AGND through a short trace. Floating inputs cause the track/hold to drift between conversions and increase channel-to-channel crosstalk. When using external reference mode, ensure the external reference can source the REF pin's input current (typically a few mA during conversion); a high-impedance reference causes gain error. Always complete a full WR-RD conversion cycle before issuing the next conversion - back-to-back WR strobes without reading the result register the wrong channel.
Compliance Information
MAX199BEAI+ (with '+' suffix) is the lead-free RoHS-compliant variant. The legacy MAX199BEAI (without '+') is non-RoHS. Use MAX199BEAI+ for new designs. AEC-Q100 is not applicable - this is a precision data converter, not an automotive-specific part.