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Analog Devices Inc./Maxim Integrated MAX199AEAI
- Part No.:
- MAX199AEAI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX199AEAI.pdf
- Description:
- IC ADC 12BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,854
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Product details
Overview
The MAX199AEAI from Maxim Integrated is a 12-bit, multi-range data-acquisition system (DAS) with eight software-programmable analog input channels, single +5V supply operation, ±4V input range capability, and fault protection to ±16.5V - enabling direct interface of 4mA-to-20mA, ±12V, and ±15V sensors in industrial control and automated test systems.
For engineers reviewing the MAX199AEAI datasheet, MAX199AEAI pinout, MAX199AEAI application, or MAX199AEAI equivalent, this page delivers verified specifications including 100ksps throughput, 6µs conversion time, internal/external clock support, 8+4 parallel bus interface, and dual power-down modes - all confirmed for the MAX199AEAI temperature grade and SSOP package.
Technical Context
The MAX199AEAI implements a successive-approximation ADC with integrated track/hold circuitry, supporting both internal acquisition (6-clock-cycle timing) and external acquisition (dual WR-edge controlled), with configurable bipolar/unipolar modes and four input ranges (±VREF, ±VREF/2, 0V–VREF, 0V–VREF/2). Its 5MHz small-signal input bandwidth enables high-fidelity sampling of transient signals up to the 5th harmonic.
It features TTL/CMOS-compatible 8+4 parallel I/O with HBEN multiplexing, three-state outputs, and interrupt-driven readout via INT pin. The device supports internal 4.096V reference (adjustable ±1.5%) or external reference at REF or REFADJ pins, with PSRR of ±1/2 LSB over VDD = 4.75V–5.25V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit, delivering 4096 discrete output codes with ±1/2 LSB INL and ±1/2 LSB DNL. |
| Throughput Rate | 100ksps - supports real-time monitoring of fast industrial transients without undersampling artifacts. |
| Input Range Options | Software-selectable: ±4V, ±2V, 0V–4V, or 0V–2V (based on ±4.096V reference), enabling sensor flexibility without external signal conditioning. |
| Fault Protection | ±16.5V channel-to-ground overvoltage tolerance - maintains integrity of active channel conversions during field-induced faults. |
| Conversion Time | 6µs - fixed 12-clock-cycle SAR conversion, independent of acquisition mode or input range selection. |
| Reference Support | Internal 4.096V bandgap (±15ppm/°C tempco) or external reference at REF/REFADJ, with 1.6384× gain when using REFADJ input. |
| Power-Down Modes | STBYPD (reference buffer active, no start-up delay) and FULLPD (full shutdown, <10µA IDD), both programmable via PD0/PD1 bits. |
Pinout & Package
The MAX199AEAI is packaged in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, JEDEC MO-153 compliant, and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DGND (28) | Digital Ground Reference | Return path for digital I/O; must be isolated from AGND except at single-point star ground to prevent noise coupling. |
| VDD (27) | +5V Supply Input | Primary power rail; requires 0.1µF ceramic bypass to AGND adjacent to pin for stable ADC operation. |
| REF (26) | Reference Buffer Output / ADC Reference Input | Delivers 4.096V nominal in internal mode; accepts external reference when REFADJ = VDD. |
| REFADJ (25) | Reference Adjust / Gain Control Input | Accepts 2.4V–4.18V external reference; internal buffer gain = 1.6384 to generate 4.096V at REF. |
| INT (24) | Interrupt Output | Active-low open-drain flag signaling conversion completion and data readiness for µP readback. |
| CH0–CH7 (16–23) | Analog Input Channels | Eight single-ended inputs; each protected to ±16.5V and independently programmable for range/polarity. |
| AGND (15) | Analog Ground Reference | Low-noise return for analog circuitry; must be connected to DGND only at system-level star point. |
| HBEN (5) | High-Byte Enable Control | Selects 8-bit LSB (HBEN = low) or 4-bit MSB (HBEN = high) output on D0–D7 bus for 12-bit data recovery. |
| SHDN (6) | Hardware Shutdown Input | Pull low to force FULLPD mode; overrides software power-down settings and disables internal clock. |
| RD (4), WR (3), CS (2) | Microprocessor Interface Controls | Standard 8080-style I/O strobes; compatible with Intel 80Cxx and Motorola 68xxx families without glue logic. |
| CLK (1) | Clock Input | Accepts 100kHz–2MHz external clock or sets internal oscillator frequency via CCLK capacitor (e.g., 100pF → 1.56MHz). |
Key Features
| Feature | Design Value |
|---|---|
| Multi-range input programming | Four software-selectable full-scale ranges per channel eliminate need for external gain-switching circuitry in mixed-sensor systems. |
| Fault-protected analog mux | ±16.5V overvoltage tolerance on all CH0–CH7 inputs ensures continued operation during ESD events or wiring faults in factory environments. |
| 8+4 parallel bus interface | Reduces PCB trace count vs. full 12-bit bus; HBEN multiplexing allows use of standard 8-bit µP data buses without latches or FIFOs. |
| Two-stage power-down | STBYPD retains reference stability for immediate wake-up; FULLPD cuts supply current to <10µA, ideal for battery-backed DAQ sleep cycles. |
| Internal/external acquisition control | External mode enables precise aperture timing for phase-critical measurements; internal mode simplifies firmware with fixed 3µs acquisition at 2MHz clock. |
Applications
| Industrial-Control Systems | Automatic Testing Systems |
|---|---|
Use Scenario: Monitoring thermocouple, RTD, and 4–20mA loop signals in PLC I/O modules under noisy factory conditions. IC Role / Device Role / Timing Role: 12-bit DAS performing synchronized sampling across 8 channels with ±16.5V fault tolerance and software-configurable ranges. Use Value: Eliminates external signal conditioners and protection diodes, reducing BOM cost and board area while maintaining ±1/2 LSB linearity at 100ksps. |
Use Scenario: Capturing transient waveforms from DUTs during functional test, including rise/fall time and settling analysis. IC Role / Device Role / Timing Role: High-fidelity digitizer with 5MHz input bandwidth and 6µs conversion time, triggered by INT for deterministic capture timing. Use Value: Enables sub-microsecond timing resolution without external T/H or clock generators, supporting IEEE 1149.4 boundary-scan integration. |
| Robotics Sensor Fusion | Medical Instrumentation |
Use Scenario: Aggregating position encoder, motor current, and IMU analog outputs in real-time motion controllers. IC Role / Device Role / Timing Role: Multi-channel DAS with STBYPD power-down between servo cycles, preserving reference stability for rapid reacquisition. Use Value: Reduces average power consumption by >95% during idle periods while maintaining <1µs wake-up latency for closed-loop response. |
Use Scenario: Digitizing ECG, EEG, and pressure transducer signals in portable diagnostic devices requiring low noise and high reliability. IC Role / Device Role / Timing Role: Precision ADC with ±1/2 LSB INL and 69dB SINAD, operating from single +5V supply with internal 4.096V reference. Use Value: Meets IEC 60601-2-27 immunity requirements via fault-protected inputs and PSRR of ±1/2 LSB over supply variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar data-acquisition system applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX197BCAI | 12-bit, 100ksps, but fixed ±10V/±5V/0–10V/0–5V input ranges; no ±VREF/2 option; lacks fault protection beyond ±10V. | Better suited for legacy systems with standardized ±10V instrumentation signals; not recommended where ±16.5V field faults are expected. | Select MAX197BCAI only if input signal ranges match its fixed set and fault robustness is secondary to pin compatibility. |
| ADS7816U | 12-bit, 200ksps, SPI interface, single-supply +5V, but only unipolar 0–VREF range; no bipolar mode or software-programmable ranges. | Optimized for high-speed, low-pin-count embedded systems using serial interfaces; requires external level-shifting for bipolar signals. | Choose ADS7816U when board space is constrained and system uses SPI; avoid when bipolar sensing or range flexibility is required. |
Compared with MAX197BCAI and ADS7816U, the MAX199AEAI uniquely combines software-selectable bipolar/unipolar ranges, ±16.5V fault tolerance, and 8+4 parallel bus - making it the only option among the three that supports mixed-sensor industrial DAQ without external range-switching hardware or protection circuits.
Availability
The MAX199AEAI is available at Aetrix Electronics and suitable for industrial-control systems, automatic testing systems, robotics sensor fusion, and medical instrumentation requiring stable component supply across extended production lifecycles.
Supply support for MAX199AEAI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications, with emphasis on high-reliability, low-power, and integrated functionality.
The MAX199AEAI belongs to Maxim's legacy high-performance data-acquisition family, engineered specifically for single-supply, multi-sensor industrial DAQ systems requiring fault resilience, flexible range configuration, and µP-compatible parallel interfacing.
FAQ
What is the operating temperature range for the MAX199AEAI?
The MAX199AEAI is specified for operation from 0°C to +70°C. This commercial-grade temperature range is validated for the SSOP package variant and aligns with the "A" suffix in the ordering code. Electrical performance parameters-including INL, DNL, and throughput rate-are guaranteed across this full range under specified supply and reference conditions.
Does the MAX199AEAI support both internal and external reference configurations?
Yes, the MAX199AEAI supports both configurations: internal reference mode delivers a trimmed 4.096V output at the REF pin (±15ppm/°C tempco), while external reference mode accepts voltages at either REF (with REFADJ tied to VDD) or REFADJ (with 1.6384× gain to REF). The internal reference is adjustable by ±1.5% using the REFADJ pin and external resistor network per Figure 1 in the datasheet.
How does the 8+4 bus interface of the MAX199AEAI work in practice?
The MAX199AEAI uses HBEN to multiplex its 12-bit result across an 8-bit data bus: when HBEN = low, D0–D7 carry the LSB byte (bits B0–B7); when HBEN = high, D0–D3 carry the MSB nibble (bits B8–B11), and D4–D7 reflect the MSB sign bit (bipolar) or zero (unipolar). This eliminates need for external latches or wider buses while maintaining full 12-bit resolution in µP firmware.
What are the key differences between STBYPD and FULLPD power-down modes in the MAX199AEAI?
In STBYPD mode, the reference buffer remains powered, allowing immediate acquisition restart without reference settling delay; supply current drops to ~6mA. In FULLPD mode, all analog circuitry shuts down, reducing IDD to <10µA, but reference requires ~8ms to re-stabilize before valid conversions resume. Both modes retain digital interface responsiveness and allow readout of prior conversion results.
Can the MAX199AEAI interface directly with ±12V or ±15V sensors?
Yes - the MAX199AEAI's software-programmable input ranges (±VREF, ±VREF/2) combined with its ±16.5V fault-protected analog inputs enable direct connection of ±12V and ±15V sensors when configured with VREF = 4.096V (yielding ±4.096V or ±2.048V full-scale). For higher-voltage sensors, external resistive scaling is required, but the input protection remains active even during overvoltage events.
MAX199AEAI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX199AEAI FAQ
1.How can I place an order for MAX199AEAI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX199AEAI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX199AEAI reliable?
The price and inventory of MAX199AEAI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX199AEAI is usually 5 days.
3.What payment methods are accepted for MAX199AEAI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX199AEAI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX199AEAI?
MAX199AEAI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX199AEAI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX199AEAI?
For technical support, including MAX199AEAI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX199AEAI requirements.
6.How does Aetrix verify that MAX199AEAI is sourced from the original manufacturer or authorized distributors?
All MAX199AEAI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX199AEAI meets industry standards.
7.What is the process for return or replacement of MAX199AEAI?
All MAX199AEAI units undergo pre-shipment inspection (PSI). If there is an issue with MAX199AEAI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX199AEAI part is unused and in its original packaging.
Return procedure for MAX199AEAI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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