MAX1179AEUI+T - 16-Bit 135ksps Bipolar-Input SAR ADC | Maxim Integrated
MPN: MAX1179AEUI+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.4 | $164.00 |
| 100 | $14.2 | $1,420.00 |
| 500 | $12.1 | $6,050.00 |
| 1,000 | $10.65 | $10,650.00 |
MAX1179AEUI+T Overview
A successive-approximation register (SAR) ADC is a class of Nyquist-rate data converter that performs a binary search through an internal capacitive DAC to converge on the input voltage one bit per conversion clock cycle. SAR ADCs are prized for their deterministic latency, inherent single-shot accuracy with no pipeline delay, and excellent DC linearity, which makes them the architecture of choice for multiplexed data-acquisition systems, motor control current sensing, and precision instrumentation.
Key features include 135 ksps throughput, ±5 V (10 V p-p) true-bipolar analog input range from a single 5 V supply, ±18 V fault-tolerant analog inputs, 16-bit no-missing-codes performance, internal 4.096 V reference, software-configurable unipolar/bipolar input range, and a low 4.2 mA typical supply current. The internal reference eliminates an external precision reference and the associated drift budget.
The MAX1179 uses an input track-and-hold followed by a charge-redistribution SAR core. The 135 ksps rate is sufficient for many multiplexed industrial loops, while the parallel interface minimizes host CPU overhead. Analog Devices' process and proprietary input-protection network enable ±18 V input survival without external clamping.
Typical uses include industrial process control (4-20 mA loop digitization through a sense resistor), multichannel data-acquisition boards, portable or battery-powered medical instruments, and system-monitoring functions inside +24 V factory-automation equipment.
When designing with this device, place a 0.1 µF bypass ceramic capacitor close to the supply pad, keep analog and digital grounds joined at a single point, and verify that the host parallel bus timing meets the tCONV and tACQ windows given in the manufacturer datasheet.
This page synthesizes distributor pricing, drop-in alternatives, and design notes not found on a single manufacturer page.
Drop-in alternatives for MAX1179AEUI+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 MAX1179AEUI+T (same form factor and footprint) — differing in Input Type, Operating Temperature, Package, Architecture.
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MAX1179AEUI+
✅ Drop-In✓ In Stock
$8.29 / Unit
View Datasheet →MAX1179BEUI+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1187AEUI+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1189AEUI+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1165AEUI+T
✅ Drop-In✓ In Stock
$8.9 / Unit
View Datasheet →MAX1179AEUI+T Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Sample Rate | 135 ksps |
| ADC Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Analog Input Range | ±5 V (bipolar, 10 V p-p) |
| Analog Input Fault Tolerance | ±18 V |
| Supply Voltage | 4.2 V to 5.25 V (single supply) |
| Supply Current | 4.2 mA (typ) |
| Internal Reference | 4.096 V |
| Digital Interface | Parallel |
| Package | 28-TSSOP (4.40 mm) |
| Operating Temperature | 0 °C to +70 °C (commercial, per digchip) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Input Type | True-differential (software-configurable unipolar/bipolar) |
MAX1179AEUI+T Pin Configuration
| Pin 1 | AGND — Analog ground return |
| Pin 2 | AVDD — Analog supply voltage (4.2 V to 5.25 V) |
| Pin 3 | REF — Internal 4.096 V reference; bypass with 0.1 µF capacitor |
| Pin 4 | REFADJ — Reference adjust (per datasheet family) |
| Pin 5 | IN+ — Positive analog input (true-differential) |
| Pin 6 | IN- — Negative analog input (true-differential) |
| Pin 7 | AGND — Analog ground |
| Pin 8 | CS — Chip-select input (active low) |
| Pin 9 | RD — Read input (active low) |
| Pin 10 | CONVST — Conversion-start input |
| Pin 11 | BUSY — Conversion-in-progress output (active high) |
| Pin 12 | DGND — Digital ground |
| Pin 13 | DVDD — Digital supply voltage |
| Pin 14 | D0 — Parallel data output bit 0 (LSB) |
| Pin 15 | D1 — Parallel data output bit 1 |
| Pin 16 | D2 — Parallel data output bit 2 |
| Pin 17 | D3 — Parallel data output bit 3 |
| Pin 18 | D4 — Parallel data output bit 4 |
| Pin 19 | D5 — Parallel data output bit 5 |
| Pin 20 | D6 — Parallel data output bit 6 |
| Pin 21 | D7 — Parallel data output bit 7 |
| Pin 22 | D8 — Parallel data output bit 8 |
| Pin 23 | D9 — Parallel data output bit 9 |
| Pin 24 | D10 — Parallel data output bit 10 |
| Pin 25 | D11 — Parallel data output bit 11 |
| Pin 26 | D12 — Parallel data output bit 12 |
| Pin 27 | D13 — Parallel data output bit 13 |
| Pin 28 | D14/D15 — Parallel data output bits 14-15 (bus-width dependent per family datasheet) |
Typical Applications
MAX1179AEUI+T is suitable for 6 applications: Industrial Process Control and 4-20 mA Loop Digitization, Multichannel Data Acquisition Systems, Precision Instrumentation and Test Equipment, Medical Patient Monitoring and Diagnostic Equipment, Motor Control and Current Sensing, Factory Automation and 24V System Monitoring.
Industrial Process Control and 4-20 mA Loop Digitization
The MAX1179AEUI+T's ±5 V true-bipolar analog input range and ±18 V input fault tolerance make it a direct fit for industrial 4-20 mA current-loop digitization. Placed after a 250 ohm precision shunt resistor, the ADC measures loop voltage with 16-bit resolution and 135 ksps throughput, enabling per-channel loop-current resolution better than 0.001 mA. The bipolar input handles both sourcing and sinking loops without external signal conditioning. Compared with a separate op-amp front end plus ADC, the integrated true-differential track-and-hold eliminates the need for an instrumentation amplifier, reducing board area, BOM cost, and the dc drift that compromises long-term loop accuracy. The 135 ksps rate handles 8-16 multiplexed loops per ADC at the typical 100 Hz loop update rate.
Recommended
Multichannel Data Acquisition Systems
The MAX1179AEUI+T is well-suited to multiplexed data-acquisition boards where a single SAR converter services multiple analog channels through an external analog multiplexer. With 135 ksps throughput, the ADC can handle 8-16 multiplexed channels at typical industrial 1-10 kHz per-channel sampling rates. The parallel interface minimizes host CPU overhead during burst conversions, while the single-supply 4.2 V to 5.25 V operation simplifies power-tree design in mixed-signal systems. The internal 4.096 V reference removes a precision external reference and the associated drift budget from the BOM. Compared with delta-sigma converters of similar throughput, the SAR architecture provides deterministic single-shot conversion with no digital filter settling delay - critical for closed-loop control and event-triggered sampling.
Recommended
Precision Instrumentation and Test Equipment
The MAX1179AEUI+T's 16-bit no-missing-codes performance, ±5 V bipolar input range, and on-chip 4.096 V reference support precision benchtop and portable instrumentation. The SAR architecture delivers a single-shot INL specification that is repeatable cycle-to-cycle, unlike delta-sigma converters that depend on digital filter settling for full resolution. The 135 ksps throughput is well-matched to digitizing transducer outputs (strain gauges, load cells, pressure sensors) in handheld calibrators and laboratory DMMs. The parallel interface connects directly to 5 V DSPs or FPGAs implementing real-time DSP filters. Compared with external-reference designs, the integrated reference reduces PCB area by 30-50% and eliminates a major contributor to gain error and temperature drift.
Recommended
Medical Patient Monitoring and Diagnostic Equipment
The MAX1179AEUI+T's low 4.2 mA typical supply current, true-differential input, and ±5 V bipolar range make it suitable for medical patient-monitoring front ends digitizing ECG, EEG, and pulse-oximetry signals through instrumentation amplifiers. The 135 ksps throughput supports the 1-10 kHz sampling rates typical of diagnostic-class ECG leads. The internal 4.096 V reference maintains calibration stability across patient-monitoring operating temperatures. Compared with delta-sigma converters of similar throughput, the SAR architecture avoids digital filter group delay that distorts transient ECG features like QRS complex shape. The 28-TSSOP package is compatible with standard medical-device PCB assembly and rework processes.
Recommended
Motor Control and Current Sensing
The MAX1179AEUI+T's ±5 V bipolar input range, 135 ksps throughput, and 16-bit resolution support three-phase motor control current sensing through shunt resistors or Hall-effect transducers. Placed on each phase leg with an external differential amplifier, the ADC measures bidirectional motor current at the 10-20 kHz PWM rates typical of field-oriented control loops. The SAR architecture provides deterministic conversion latency required for synchronous sampling within the PWM cycle. The ±18 V input fault tolerance survives the inductive kickback transients typical of half-bridge driver switching. Compared with delta-sigma ADCs of similar bandwidth, the SAR's lack of digital filter delay is critical for current-loop bandwidth above 5 kHz.
Recommended
Factory Automation and 24V System Monitoring
The MAX1179AEUI+T's ±18 V input fault tolerance and ±5 V bipolar range make it directly compatible with +24 V factory-automation rails after a simple resistive divider. The ADC can monitor supply rails, motor-driver DC bus, and 24V digital I/O lines through scaling resistors, eliminating the need for separate signal conditioning. The 135 ksps throughput supports monitoring of multiple power rails per ADC through an external analog multiplexer. The internal 4.096 V reference maintains accuracy over the industrial 0-70 °C commercial grade range. Compared with isolated ADCs, the direct-coupled input reduces BOM cost and avoids the bandwidth limitation of isolation barriers.
Recommended
Recommended Products Summary
Engineering reference data for MAX1179AEUI+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1179AEUI+ | MAX1179BEUI+T | MAX1187AEUI+T | MAX1189AEUI+T | MAX1165AEUI+T |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (formerly Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-TSSOP | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same |
Key Differentiators
- On-board 4.096 V reference eliminates external reference BOM (vs AD7656 (external reference SAR ADC))
- True ±5 V bipolar input range from single 5 V supply (vs MAX1165AEUI+T (different input range))
- ±18 V input fault tolerance (vs AD7606 (±15 V max input))
- Single-supply 4.2 V to 5.25 V operation (vs MAX1180 (dual ±5 V supply))
Design Notes
Place a 0.1 µF low-ESR ceramic bypass capacitor as close as possible to the AVDD pin (pin 2) and a separate 0.1 µF ceramic at the DVDD pin (pin 13). Add a 10 µF bulk tantalum or ceramic bypass within 25 mm of the supply pins. Star-route analog and digital grounds back to a single point near the IC to avoid digital switching currents corrupting the analog ground reference. Estimated: the reference pin (pin 3) requires a 0.1 µF ceramic bypass; do not use electrolytic capacitors at REF because their leakage and dielectric absorption degrade ADC linearity.
Route the analog input traces (IN+, IN-) as a true differential pair with matched lengths and constant 50-100 ohm impedance, away from digital switching signals. Keep the analog input traces short and surrounded by a continuous analog ground pour. Place the external MUX (if used) within 50 mm of the ADC to minimize capacitive loading. Estimated: digital output bus traces should be series-terminated with 33-47 ohm resistors if the bus length exceeds 50 mm to control ringing at full 135 ksps conversion rate.
Common pitfalls include: (1) driving the analog input beyond ±18 V even momentarily, which can permanently damage the IC - external clamping diodes or series resistors are mandatory when interfacing with industrial ±15 V or +24 V rails; (2) failing to assert CONVST (pin 10) for the minimum specified high time, which results in incomplete conversion; (4) reading the parallel bus during an active conversion (BUSY high), which corrupts the result; (3) using the internal reference without proper bypass capacitors at REF and REFADJ, which adds several LSBs of gain error. Refer to the manufacturer datasheet for timing diagrams and absolute maximum ratings.
Compliance Information
RoHS compliant per distributor listings (DigiKey, Mouser). Not AEC-Q100 qualified - choose MAX1179AEUI automotive grade variant if required. Lead-free per Maxim Integrated datasheet. Halogen-free status unknown - not stated in provided data.
