MAX199BEAI - 12-Bit 8-Channel +5V Multi-Range DAS | Maxim Integrated
MPN: MAX199BEAI ✓ فعالMAX199BEAI نمای کلی
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.
جایگزین‌های drop-in برای MAX199BEAI — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای MAX199BEAI (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Input Overvoltage Protection, Logic Compatibility, Package, Resolution, Supply Voltage.
MAX199BEAI+
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
MAX199AEAI+
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
MAX199BEAI-T
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
MAX197BEAI
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
MAX196AEAI
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←MAX194ACPE
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
MAX199BEAI حداکثر مقادیر مجاز و مشخصات الکتریکی
| رزولوشن | 12 bits |
| Number of Analog Input Channels | 8 |
| Input Voltage Ranges | ±4 V, ±2 V, +4 V, +2 V (software-selectable) |
| نرخ نمونه‌برداری | 100 kSPS |
| ولتاژ تغذیه | +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 |
| دمای کاری | -40 °C to +85 °C (industrial, E suffix) |
| بسته‌بندی | 28-pin SSOP |
| نوع نصب | Surface Mount |
پیکربندی پین MAX199BEAI
| پین 1 | AIN0 — Analog input channel 0 |
| پین 2 | AIN1 — Analog input channel 1 |
| پین 3 | AIN2 — Analog input channel 2 |
| پین 4 | AIN3 — Analog input channel 3 |
| پین 5 | AIN4 — Analog input channel 4 |
| پین 6 | AIN5 — Analog input channel 5 |
| پین 7 | AIN6 — Analog input channel 6 |
| پین 8 | AIN7 — Analog input channel 7 |
| پین 9 | AGND — Analog ground |
| پین 10 | AVDD — Analog +5 V supply |
| پین 11 | REF — Reference voltage (internal 4.096 V or external overdrive) |
| پین 12 | RANGE — Input range select (logic level sets ±4 V/±2 V/+4 V/+2 V) |
| پین 13 | MODE — Conversion clock mode select (internal/external) |
| پین 14 | WR — Write strobe (active low) |
| پین 15 | RD — Read strobe (active low) |
| پین 16 | CS — Chip select (active low) |
| پین 17 | INT — Interrupt output (active low, end-of-conversion) |
| پین 18 | D0/D8 — Data bit 0 (or address bit 0 in 8+4 mode) |
| پین 19 | D1/D9 — Data bit 1 (or address bit 1 in 8+4 mode) |
| پین 20 | D2/D10 — Data bit 2 (or address bit 2 in 8+4 mode) |
| پین 21 | D3/D11 — Data bit 3 (or address bit 3 in 8+4 mode) |
| پین 22 | D4 — Data bit 4 |
| پین 23 | D5 — Data bit 5 |
| پین 24 | D6 — Data bit 6 |
| پین 25 | D7 — Data bit 7 (MSB in 8-bit mode; MSB in 12-bit mode) |
| پین 26 | CLK — External conversion clock input (when MODE selects external clock) |
| پین 27 | DGND — Digital ground |
| پین 28 | DVDD — Digital +5 V supply |
کاربردهای معمول
MAX199BEAI مناسب است برای 6 کاربردs: 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.
پیشنهادی
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.
پیشنهادی
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.
پیشنهادی
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.
پیشنهادی
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.
پیشنهادی
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.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای MAX199BEAI — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | 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 |
تفاوت‌های کلیدی
- Pin-compatible with MAX197 for ±10 V upgrade path (در مقابلMAX197BEAI)
- Higher linearity (B grade) than A-grade alternative (در مقابلMAX199AEAI+)
- Industrial temperature range (-40°C to +85°C) (در مقابلMAX199CEAI)
یادداشت‌های طراحی
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.
اطلاعات انطباق
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.