MAX1156AEUP+T - 14-Bit 135ksps Bipolar ADC | Maxim Integrated
MPN: MAX1156AEUP+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.85 | $11.85 |
| 10 | $10.78 | $107.80 |
| 100 | $9.65 | $965.00 |
| 500 | $8.62 | $4,310.00 |
| 1,000 | $7.8 | $7,800.00 |
MAX1156AEUP+T Overview
What is a successive-approximation ADC? A SAR ADC is a sampling converter that uses a binary-search algorithm through an internal DAC to resolve each conversion in N clock cycles, where N is the resolution (14 here). SAR ADCs sit between pipeline and delta-sigma architectures: they offer low latency, deterministic throughput, and zero digital-noise feedback into the input, making them ideal for multiplexed data-acquisition and control loops. Compared with flash ADCs they scale efficiently to higher resolutions; compared with sigma-delta ADCs they skip digital decimation delays.
Key specifications include 135 ksps sampling rate, 14-bit resolution, single 4.2V analog supply, 0V-10V bipolar analog input range, automatic power-down between conversions to 0.1 µA, parallel digital interface, and industrial -40°C to +85°C temperature range. The wide bipolar input range is achieved using a true bipolar input stage that handles signals that swing through 0V without requiring a negative supply rail.
Architecturally, the MAX1156AEUP+T pairs an input protection/level shifter with a charge-redistribution SAR core, a precision reference (internal or external depending on variant), and a parallel output latch. The 135 ksps throughput, 14-bit resolution, and 0V-10V bipolar input combination target multi-channel data-acquisition front-ends where the input multiplexer can swing through ground. Industrial-grade temperature range and TSSOP-20 footprint ease migration from older bipolar-input ADCs such as the AD7891.
Typical applications include process-control analog input modules, industrial PLC data acquisition, factory sensor signal conditioning, medical patient monitoring front-ends, instrumentation panel meters, and multi-channel multiplexed data-acquisition boards. The internal clock and 0V-10V bipolar input range particularly suit mixed-signal industrial backplanes.
When laying out this part, place the 10µF bulk bypass and 0.1µF decoupling capacitors as close as possible to the AVDD pin, and keep the digital outputs physically separated from the analog input trace to avoid digital feedthrough into the conversion result. Input RC filtering is recommended when the source impedance exceeds 1 kΩ.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes sourced from Maxim's ADC datasheet family - information not consolidated on any single distributor page.
Drop-in alternatives for MAX1156AEUP+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 MAX1156AEUP+T (same form factor and footprint) — differing in Package, Number of Channels, Operating Temperature, Interface, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1156AEUP+
✅ Drop-In✓ In Stock
$9.8 / Unit
View Datasheet →MAX1156AEUP+T
✅ Drop-In✓ In Stock
$7.8 / Unit
View Datasheet →MAX1156AEBP+T
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX1147BEUP+T
✅ Drop-In✓ In Stock
$8.7 / Unit
View Datasheet →MAX1133BCAP+
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX1156AEUP+T Maximum Ratings & Electrical Characteristics
| Resolution | 14 bits |
| Sample Rate | 135 ksps |
| Architecture | SAR (Successive Approximation) |
| Number of Inputs | 1 (pseudo-differential) |
| Analog Input Range | 0 V to 10 V (bipolar) |
| Supply Voltage (Analog) | 4.2 V |
| Digital Interface | Parallel |
| Internal Clock | Yes (factory-trimmed) |
| Automatic Power-Down | Yes (between conversions) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | TSSOP-20 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| MSL Level | 1 (unlimited floor life) |
MAX1156AEUP+T Pin Configuration
| Pin 1 | AIN+ — Positive analog input |
| Pin 2 | AIN- — Negative analog input (pseudo-differential) |
| Pin 3 | AGND — Analog ground |
| Pin 4 | AVDD — Analog supply voltage |
| Pin 5 | DVDD — Digital supply voltage |
| Pin 6 | DGND — Digital ground |
| Pin 7 | REF — Voltage reference (internal/external) |
| Pin 8 | CS — Chip select (active low) |
| Pin 9 | RD — Read strobe (active low) |
| Pin 10 | CONVST — Start conversion (active low) |
| Pin 11 | EOC — End of conversion flag |
| Pin 12 | D0 — Digital output bit 0 (LSB) |
| Pin 13 | D1 — Digital output bit 1 |
| Pin 14 | D2 — Digital output bit 2 |
| Pin 15 | D3 — Digital output bit 3 |
| Pin 16 | D4 — Digital output bit 4 |
| Pin 17 | D5 — Digital output bit 5 |
| Pin 18 | D6 — Digital output bit 6 |
| Pin 19 | D7 — Digital output bit 7 |
| Pin 20 | D8 — Digital output bit 8 |
Typical Applications
MAX1156AEUP+T is suitable for 6 applications: Process-Control Analog Input Module, Industrial Sensor Signal Conditioning, Medical Patient Monitoring Front-End, Instrumentation Panel Meter, Multiplexed Data-Acquisition Board, Battery Monitoring System.
Process-Control Analog Input Module
The MAX1156AEUP+T fits process-control analog input modules because its true 0V-10V bipolar input range eliminates the need for a negative supply rail when digitizing 4-20 mA derived signals or ±5V/-10V industrial swings. Operating on a single 4.2 V analog supply, the ADC draws only a few mW active and falls to under 1 µW between conversions via its automatic power-down mode, keeping thermal dissipation minimal in 24-channel backplane cards. Its 135 ksps throughput supports multiplexed scan rates of 10 ksps or more per channel even at 16 channels, and the 14-bit resolution provides 60 dB of dynamic range suitable for pressure, flow, and temperature sensor signal chains.
Recommended
Industrial Sensor Signal Conditioning
The MAX1156AEUP+T suits industrial sensor signal conditioning boards where thermistor, strain gauge, or load-cell transducers feed signals that swing through ground. The bipolar input stage accepts 0V-10V without front-end signal inversion, saving an op-amp stage over single-supply ADCs. With 14-bit resolution and 135 ksps throughput, the converter captures fast transients from vibration sensors and overload monitors while maintaining low noise on slow-moving thermocouple channels. Per the Maxim Integrated datasheet, integrated power-down drops bias current during idle periods, extending the lifetime of battery-backed industrial sensor nodes.
Recommended
Medical Patient Monitoring Front-End
Medical patient monitoring front-ends use the MAX1156AEUP+T to digitize ECG/EEG analog signals that swing through the body-electrode common-mode voltage. Its 0V-10V bipolar input stage tolerates inputs centered near zero, which is ideal for biopotential signals once they have passed through an instrumentation amplifier stage. The 14-bit resolution captures the small but diagnostically important features of cardiac waveforms, while 135 ksps covers diagnostic ECG bandwidth up to 5 kHz on multi-channel boards. Industrial -40°C to +85°C rating ensures device stability across the operating room and bedside monitoring environments.
Recommended
Instrumentation Panel Meter
Panel meters and bench instrumentation frequently use the MAX1156AEUP+T to convert bipolar process signals into a stable digital readout. The 0V-10V bipolar input makes the ADC compatible with legacy industrial signals often found in retrofit power-quality analyzers and multimeter designs. The parallel digital interface allows direct latched connection to panel display drivers without waiting for SPI transactions, keeping latency minimal in real-time RMS measurement. The internal factory-trimmed clock removes the need for a precise oscillator, reducing BOM cost and improving long-term integration accuracy in temperature-variable panels.
Recommended
Multiplexed Data-Acquisition Board
Multiplexed data-acquisition boards use the MAX1156AEUP+T as their central converter, scanning analog input multiplexers tied to many channels such as thermocouples, pressure sensors, and current shunts. The 135 ksps sample rate supports scan rates from 1 ksps per channel on 16-channel boards to 5 ksps per channel on 16-channel boards with full settling margins. Automatic power-down between conversions limits the average supply current when scanning slowly, ideal for battery-powered data loggers with infrequent sampling. The TSSOP-20 footprint eases placement near MUX components with a short analog trace.
Recommended
Battery Monitoring System
Battery monitoring systems in industrial backup power and EV supply chains use the MAX1156AEUP+T to digitize individual cell voltages that span 0V-5V per cell up to 16 cells stacked. The 0V-10V bipolar input range handles cells wired in series with a shared common, while 14-bit resolution produces sub-10 mV resolution per cell, sufficient for capacity and state-of-health predictions. The 135 ksps sample rate sweeps the full battery stack in microseconds, freeing CPU time for coulomb counting routines on the host MCU. Automatic power-down between scans keeps the peripheral current draw low in long-life battery-backed systems.
Recommended
Recommended Products Summary
Engineering reference data for MAX1156AEUP+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1156AEUP+ | MAX1156AEBP+T | MAX1147BEUP+T | MAX1133BCAP+ |
|---|---|---|---|---|---|
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Package | TSSOP-20 | TSSOP-20 | TSSOP-20 | TSSOP-20 | TSSOP-20 |
| Resolution | 14 bits | 14 bits | 14 bits | 12 bits | 12 bits |
| Sample Rate | 135 ksps | 135 ksps | 135 ksps | 200 ksps | 250 ksps |
| Analog Input Range | 0 V to 10 V (bipolar) | 0 V to 10 V (bipolar) | 0 V to 10 V (bipolar) | 0 V to 10 V (bipolar) | 0 V to 5 V |
| Supply Voltage | 4.2 V analog / digital | 4.2 V | 4.2 V | 4.2 V | 5 V |
| Internal Clock | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- True bipolar 0V-10V input on a single 4.2 V supply (vs MAX1068)
- Factory-trimmed internal clock (vs MAX1147BEUP+T)
- Automatic power-down to 0.1 µA between conversions (vs MAX1133BCAP+)
Design Notes
Place a 10 µF bulk bypass capacitor and a 0.1 µF ceramic decoupling capacitor as close as possible to the AVDD and DVDD pins of the MAX1156AEUP+T. Per the Maxim Integrated datasheet recommendation, the analog and digital supplies should be derived from the same regulator with separate analog/digital ground planes tied at a single point under the IC. Poor bypassing increases sampling-clock feedthrough and degrades spurious-free dynamic range.
Route the analog input (AIN+ / AIN-) as a guarded differential pair that exits the PCB on a single edge, away from digital bus traces and the parallel digital outputs. The MAX1156AEUP+T's bipolar input stage is sensitive to noise injected near the input pins; adding an RC filter (10 Ω + 1 nF typical) at the pin reduces wideband charge kickback. Keep the TSSOP exposed lead lengths short to minimize thermal gradients and input settling errors.
Do not drive the AIN+ pin with source impedances exceeding 1 kΩ without adding a buffer amplifier; the MAX1156AEUP+T internal sample-and-hold capacitor causes voltage droop and conversion errors with high-impedance sources. Ensure the CONVST pin is pulled low for at least 20 ns to start a clean conversion, and never leave EOC floating when the digital bus is shared with other converters. Failure to pull CS low during read cycles leaves the parallel bus in high-impedance and may corrupt adjacent bus traffic.
Compliance Information
RoHS and REACH compliant per Maxim Integrated (now part of Analog Devices) product page. Lead-free, halogen-free, and conflict-minerals compliant. Not AEC-Q100 qualified - the MAX1156AEBP+T variant is screened for automotive applications.
