MAX1165BEUI+T - 16-Bit 165ksps Low-Power SAR ADC | Maxim Integrated
MPN: MAX1165BEUI+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.05 | $130.50 |
| 100 | $11.65 | $1,165.00 |
| 500 | $10.45 | $5,225.00 |
| 1,000 | $9.3 | $9,300.00 |
MAX1165BEUI+T Overview
A successive-approximation register ADC (SAR ADC) is a type of data converter that resolves a single analog sample into a digital code through a binary-search algorithm across N clock cycles, producing one conversion per acquisition cycle. SAR ADCs are valued for their deterministic latency, intrinsic accuracy, low power consumption, and ease of use because they require no complex external sample-rate clocks. They sit within the broader data-converter hierarchy of ADC -> data converter -> signal-chain IC -> analog/mixed-signal IC, and are the workhorse of industrial instrumentation, multi-channel data acquisition, and precision sensor read-out systems.
The MAX1165BEUI+T integrates a precision internal voltage reference, a wide parallel digital bus, and automatic power management. The 16-bit parallel interface simplifies connection to FPGAs, CPLDs, and high-performance microcontrollers, eliminating the timing overhead of serial peripherals. An external reference input allows system designers to optimize noise, drift, and full-scale range for specific transducer bridges or sensor outputs. The 28-pin TSSOP surface-mount package supports standard 0.65mm pitch PCB assembly and is compatible with automated pick-and-place production lines.
Typical applications include industrial process control, multi-channel data-acquisition systems, portable instrumentation, and precision sensor signal conditioning. The combination of low operating power (1.8 mA at full speed) and aggressive power-down (0.1 mA at 10 ksps) makes it suitable for battery-powered measurement equipment where throughput is dominated by short bursts of acquisition separated by long idle intervals. Designers also use the part in optical sensor front ends, weigh scales, and medical instrumentation front-ends.
When designing with this prototype, ensure the analog supply rail is properly decoupled close to the AVDD pin with a 10uF tantalum and 0.1uF ceramic pair, and that the reference decoupling capacitor (typically 10uF) is placed adjacent to the REF pin to absorb reference-charge glitches during conversion. The CONVST input must be a clean logic signal because internal switching transients may be re-coupled to the analog input if the sample-and-hold acquisition time is not respected.
This page synthesizes distributor pricing, drop-in same-brand alternatives, design notes, and pinout detail not presented together in the manufacturer datasheet - a concise, source-backed reference for engineers.
Drop-in alternatives for MAX1165BEUI+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 MAX1165BEUI+T (same form factor and footprint) — differing in Package, Input Type, Operating Temperature, Analog Supply Voltage, Sampling Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1165BEUI+
✅ Drop-In✓ In Stock
$9.57 / Unit
View Datasheet →MAX1165AEUI+T
✅ Drop-In✓ In Stock
$8.9 / Unit
View Datasheet →MAX1165ACUI+
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →MAX1165BEUI+T Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Converter Type | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Sampling Rate | 165 ksps |
| Input Type | Single-Ended |
| Analog Supply Voltage | 4.75 V to 5.25 V (5 V nominal) |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| Full-Scale Input Range | 0 to VREF |
| Internal Reference Voltage | 4.096 V (factory-trimmed) |
| External Reference Support | Yes |
| Supply Current (165 ksps, ext ref) | 1.8 mA |
| Supply Current (165 ksps, int ref) | 2.7 mA |
| AutoShutdown Current (10 ksps) | 0.1 mA |
| Digital Interface | 16-bit Parallel |
| Package | 28-Pin TSSOP |
| Operating Temperature | -40 C to +85 C (Extended) |
| Temperature Grade | Industrial |
| Mounting Type | Surface Mount |
MAX1165BEUI+T Pin Configuration
| Pin 1 | AGND — Analog ground |
| Pin 2 | AIN — Analog input |
| Pin 3 | REF — Reference input/output (internal 4.096V or external reference) |
| Pin 4 | AVDD — Analog supply (4.75V to 5.25V) |
| Pin 5 | DVDD — Digital supply (2.7V to 5.25V) |
| Pin 6 | DGND — Digital ground |
| Pin 7 | CONVST — Conversion start input (active high) |
| Pin 8 | CS — Chip select (active low) |
| Pin 9 | RD — Read input (active low) |
| Pin 10 | BUSY — Busy output (high during conversion) |
| Pin 11 | INT — Interrupt / data-ready output |
| Pin 12 | HBEN — High-byte enable for 8-bit bus mode |
| Pin 13 | D15 — Data bit 15 (MSB) |
| Pin 14 | D14 — Data bit 14 |
| Pin 15 | D13 — Data bit 13 |
| Pin 16 | D12 — Data bit 12 |
| Pin 17 | D11 — Data bit 11 |
| Pin 18 | D10 — Data bit 10 |
| Pin 19 | D9 — Data bit 9 |
| Pin 20 | D8 — Data bit 8 |
| Pin 21 | D7 — Data bit 7 |
| Pin 22 | D6 — Data bit 6 |
| Pin 23 | D5 — Data bit 5 |
| Pin 24 | D4 — Data bit 4 |
| Pin 25 | D3 — Data bit 3 |
| Pin 26 | D2 — Data bit 2 |
| Pin 27 | D1 — Data bit 1 |
| Pin 28 | D0 — Data bit 0 (LSB) |
Typical Applications
MAX1165BEUI+T is suitable for 6 applications: Industrial Process Control and Data Acquisition, Portable Battery-Powered Instrumentation, Precision Weigh-Scale Front-End, Medical Instrumentation Signal Chain, Sensor Signal Conditioning and Read-Out, Optical Sensor and Photodiode Front-End.
Industrial Process Control and Data Acquisition
The MAX1165BEUI+T fits industrial process control and multi-channel data-acquisition front-ends because its 16-bit SAR resolution delivers the precision needed for sensor read-out while 165 ksps throughput aggregates fast scans across many channels when paired with an external MUX. AutoShutdown (0.1 mA at 10 ksps) makes the part attractive for duty-cycled industrial sensor panels that spend most of the time idle. The wide 4.75V to 5.25V analog supply accepts common industrial 5V rails without level translation. Engineers typically place the MAX1165BEUI+T downstream of a MAX306 MUX, with 10uF tantalum + 0.1uF ceramic decoupling close to AVDD and REF.
Recommended
Portable Battery-Powered Instrumentation
The MAX1165BEUI+T fits portable battery-powered instrumentation because its 1.8 mA operating current at 165 ksps and 0.1 mA AutoShutdown current at 10 ksps minimize battery drain during duty-cycled measurement. The internal 4.096V reference eliminates the need for a separate reference IC, shrinking the BOM. The 16-bit parallel interface delivers fast sample transfer to a host microcontroller or FPGA without serial-clock overhead. Battery-powered handhelds such as digital multimeters, portable gas analyzers, and field data loggers can use the part with a 4 x AA alkaline pack regulated to 5V via a boost converter.
Recommended
Precision Weigh-Scale Front-End
The MAX1165BEUI+T fits weigh-scale and precision force-measurement front-ends because 16-bit resolution provides the dynamic range to capture both empty-trace zero offset and full-load strain-gauge output. The internal low-noise 4.096V reference drives the bridge excitation and the ADC full-scale simultaneously, simplifying gain calibration. The AutoShutdown feature extends battery life between user measurements. Designers often pair the MAX1165BEUI+T with an instrumentation amplifier (such as the MAX4194) to amplify the bridge output and then digitize it directly. A 10uF reference-decoupling capacitor absorbs the SAR reference-charge kick during each conversion.
Recommended
Medical Instrumentation Signal Chain
The MAX1165BEUI+T fits medical instrumentation front-ends such as patient monitors and diagnostic analyzers because 16-bit SAR resolution captures small biopotential signals while deterministic single-cycle conversion latency simplifies timing. The wide -40 C to +85 C industrial operating range accommodates equipment that must operate in clinical environments. The internal 4.096V reference eliminates calibration drift between the ADC and reference, simplifying periodic verification. Designers should add an RC anti-aliasing filter at the AIN pin and ensure the analog ground plane is unbroken under the ADC for optimal noise performance in medical signal chains.
Recommended
Sensor Signal Conditioning and Read-Out
The MAX1165BEUI+T fits precision sensor read-out systems because its 16-bit resolution captures both the sensor zero-offset and full-scale output without losing dynamic range. The external reference input allows the ADC full-scale to be scaled to match specific sensor outputs (thermocouple, RTD, strain gauge), and AutoShutdown reduces average power in duty-cycled sensor networks. The 28-pin TSSOP surface-mount package is well suited to compact sensor modules. Designers typically pair the MAX1165BEUI+T with a low-noise op-amp front-end (e.g., MAX4475) and route the analog and digital grounds to a single point near the ADC AGND pin.
Recommended
Optical Sensor and Photodiode Front-End
The MAX1165BEUI+T fits optical sensor and photodiode front-ends because its 16-bit SAR resolution captures low-light-level signals while the 165 ksps throughput supports real-time optical-sensor scan applications. The internal 4.096V reference provides a stable bias for transimpedance amplifiers. AutoShutdown allows pulsed LED driving without continuous ADC power draw. Optical encoders, linear-array photo sensors, and pulse-oximetry front-ends can use the MAX1165BEUI+T paired with a transimpedance amplifier (TIA). A 10uF reference-decoupling capacitor is essential to absorb the reference-charge kick from each SAR conversion cycle.
Recommended
Recommended Products Summary
Engineering reference data for MAX1165BEUI+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1165BEUI+ | MAX1165AEUI+T | MAX1165ACUI+ |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-TSSOP | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 165 ksps | 165 ksps | 165 ksps | 165 ksps |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C |
| AutoShutdown Current | 0.1 mA at 10 ksps | 0.1 mA at 10 ksps | 0.1 mA at 10 ksps | 0.1 mA at 10 ksps |
| Packaging | Tape & Reel | Tube | Tape & Reel | Tube |
| Lifecycle Status | Active | Active | Active | Active |
Key Differentiators
- Factory-trimmed internal 4.096V reference with external override option (vs MAX1165AEUI+T)
- Extended industrial temperature range (-40 C to +85 C) (vs MAX1165ACUI+)
- Tape-and-Reel packaging for SMT production (vs MAX1165BEUI+)
Design Notes
Decouple the AVDD pin with a 10uF tantalum capacitor in parallel with a 0.1uF ceramic capacitor placed as close to the pin as possible. The MAX1165BEUI+T draws 1.8 mA at 165 ksps with an external reference and 2.7 mA with the internal reference. The DVDD pin can be driven from 2.7V to 5.25V, allowing the digital logic to be powered directly from a 3.3V FPGA or microcontroller without level translation. Tie both AGND and DGND to a single low-impedance ground plane that is unbroken under the ADC to minimize digital switching noise coupling into the analog input.
Place the 10uF reference-decoupling capacitor adjacent to the REF pin. The internal 4.096V reference presents a dynamic load during each SAR conversion cycle, and insufficient decoupling will appear as gain error and reference drift. The analog and digital ground planes should join at a single point near the AGND pin to prevent ground loops. Route the CONVFB and CS lines away from the analog input trace to minimize digital crosstalk. Keep the AIN trace length short and surround it with a ground guard ring for best noise performance.
Avoid driving the AIN pin outside the 0 to VREF range during operation, as this can corrupt the sample-and-hold capacitor and require several conversion cycles to recover. Do not omit the reference decoupling capacitor, even if using the internal reference, because the SAR core draws charge from REF on every conversion. The CONVST pulse must be a clean logic edge - mechanical switches or slow-rising edges may be re-coupled to the analog input. When reading the conversion result, ensure RD is held low long enough for the parallel bus to settle, especially on long PCB traces.
Compliance Information
RoHS compliant per Maxim/Analog Devices product page. Industrial-grade -40 to +85 C operating temperature. Not AEC-Q100 qualified (automotive).
