MAX1166ACUP+T - 16-Bit 200ksps Low-Power SAR ADC | Maxim Integrated
MPN: MAX1166ACUP+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.6 | $28.60 |
| 10 | $26.45 | $264.50 |
| 100 | $23.18 | $2,318.00 |
| 500 | $20.74 | $10,370.00 |
| 1,000 | $18.92 | $18,920.00 |
MAX1166ACUP+T Overview
A successive-approximation ADC (SAR ADC) is a sampling converter that uses a binary-search algorithm against an internal precision DAC to resolve the analog input to N bits in N clock cycles. SAR ADCs combine the simplicity of a single analog input with deterministic latency, no pipeline delay, and excellent DC accuracy - the architecture is a member of the data converter family within the broader analog-to-digital converter hierarchy, which includes sigma-delta, pipeline, and flash converters.
Key specifications include 16-bit resolution with no missing codes, an on-chip +4.096V reference, a 4-channel input multiplexer on the MAX1166 (single-ended or pseudo-differential), hardware-configurable unipolar/bipolar input ranges, and a parallel digital output bus. The internal reference is trimmed to 0.01% initial accuracy, eliminating the need for an external precision reference in many designs. An on-chip clock generator and sample/hold amplifier further minimize external component count.
The MAX1166 uses a charge-redistribution DAC array followed by a low-noise comparator and successive-approximation register, all clocked by either the internal oscillator or an external clock applied at the CONVST/TMODE pin. Power-down between conversions is automatic and transparent to the user: a single CONVST rising edge initiates acquisition and conversion in one piece, after which the part returns to its nap state automatically.
Typical applications include portable industrial data loggers, battery-powered sensor signal chains (strain gauge, thermocouple, RTD), medical instrumentation front ends, automotive sensor readback, and process-control analog input cards. The integrated reference and 4-channel input scan capability allow a complete 4-channel, 16-bit data acquisition front end to be built with a single IC plus a few passives.
When designing with this part, pay attention to input protection: the analog input pins tolerate overvoltage to +/-16V with proper external clamping, and the digital supply (DVDD) should be derived from a clean 2.7V to 5.25V source to avoid coupling logic noise into the conversion result. Decouple AVDD with 10uF + 0.1uF ceramic at the pin.
This page synthesizes distributor pricing, drop-in alternatives within the MAX1165/MAX1166 family, and practical PCB-level design notes that complement the manufacturer datasheet.
Drop-in alternatives for MAX1166ACUP+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 MAX1166ACUP+T (same form factor and footprint) — differing in Interface, Internal Reference, Number of Channels, Resolution, Sampling Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1166BCUP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1166BEUP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1166ACUP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1166AEUP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1165ACUP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1147BEUP+T
✅ Drop-In✓ In Stock
$8.7 / Unit
View Datasheet →MAX1166ACUP+T Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices (Maxim Integrated) |
| MPN / Type | MAX1166ACUP+T / SAR ADC, 16-bit, parallel interface |
| Resolution | 16 bits |
| Number of Channels | 4 (single-ended / pseudo-differential) |
| Sampling Rate | 200 ksps |
| Architecture | Successive Approximation (SAR) |
| Analog Supply Voltage | 4.75 V to 5.25 V (single +5 V) |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| Analog Input Range | 0 V to +10 V (unipolar); +/-10 V (bipolar) |
| Internal Reference | +4.096 V, 0.01% initial accuracy |
| Operating Supply Current | 2.5 mA typical (active), < 1 mA (power-down) |
| Interface | Parallel, 16-bit |
| Package / Pin Count | TSSOP-20 (HTSSOP) |
| Terminal Form | GULL WING |
| Temperature Grade | COMMERCIAL (0 C to +70 C) |
| Package Code | HTSSOP |
| Mounting Type | Surface Mount |
MAX1166ACUP+T Pin Configuration
| Pin 1 | AIN0 — Analog Input 0 |
| Pin 2 | AIN1 — Analog Input 1 |
| Pin 3 | AIN2 — Analog Input 2 |
| Pin 4 | AIN3 — Analog Input 3 |
| Pin 5 | GND — Ground |
| Pin 6 | REF — Reference Voltage Input/Output (+4.096V) |
| Pin 7 | AVDD — Analog Supply Voltage (+5V) |
| Pin 8 | DVDD — Digital Supply Voltage (2.7V-5.25V) |
| Pin 9 | CONVST — Conversion Start Input |
| Pin 10 | RD — Read Input (active low) |
| Pin 11 | CS — Chip Select (active low) |
| Pin 12 | HBEN — High Byte Enable |
| Pin 13 | CLK — External Clock Input (or internal OSC) |
| Pin 14 | D15 — Data Output Bit 15 (MSB) |
| Pin 15 | D14 — Data Output Bit 14 |
| Pin 16 | D13 — Data Output Bit 13 |
| Pin 17 | D12 — Data Output Bit 12 |
| Pin 18 | D11 — Data Output Bit 11 |
| Pin 19 | D10 — Data Output Bit 10 |
| Pin 20 | D9 — Data Output Bit 9 |
Typical Applications
MAX1166ACUP+T is suitable for 6 applications: Portable Industrial Data Loggers, Battery-Powered Sensor Signal Chains, Medical Instrumentation Front Ends, Process Control Analog Input Cards, Automotive Sensor Readback, Test and Measurement Instrumentation.
Portable Industrial Data Loggers
The MAX1166ACUP+T is ideal for portable industrial data loggers because its 16-bit resolution, 200 ksps sampling rate, and sub-1 mA power-down current together enable multi-day battery operation while digitizing 4-7 sensor inputs per chip. The wide +/-10V bipolar input range accepts industrial signal levels (4-20 mA loops with 250 ohm shunts, +/-10V transducer outputs) without external op-amp conditioning. The internal +4.096V reference eliminates a precision external reference and saves BOM cost in space-constrained handheld loggers. Compared to discrete sigma-delta solutions, the SAR architecture provides deterministic single-cycle latency, which is critical when capturing transient events.
Recommended
Battery-Powered Sensor Signal Chains
The MAX1166ACUP+T suits battery-powered sensor signal chains (strain gauge bridges, thermocouples, RTDs, pressure transducers) where the bipolar +/-10V input range directly accepts full-bridge outputs and the 2.5 mA active current keeps average power under 100 mW with the automatic power-down mode. The integrated 4-channel input scan can read multiple temperature or strain gauges sequentially without external MUXes. Compared to discrete op-amp + external ADC designs, the integrated reference and input MUX cut BOM count by 5-7 parts per channel. The TSSOP-20 footprint enables compact PCB layouts in handheld instruments.
Recommended
Medical Instrumentation Front Ends
The MAX1166ACUP+T fits medical instrumentation front ends (patient monitors, blood analyzers, infusion pump diagnostics) where 16-bit no-missing-codes performance and true bipolar signal handling are required to digitize bioelectric signals and transducer signals in the millivolt to volt range. The SAR architecture's deterministic latency is critical for synchronized multi-channel physiological capture (ECG, SpO2, respiration), where pipeline delay would corrupt phase relationships. The internal +4.096V reference is trimmed to 0.01% accuracy, satisfying the linearity requirements of diagnostic-grade front ends without extra cost.
Recommended
Process Control Analog Input Cards
The MAX1166ACUP+T is a strong fit for process control analog input cards (PLC/DCS I/O modules) because the +/-10V bipolar input range accepts standard industrial +/-10V and 4-20 mA (with 250 ohm shunt) signals directly, eliminating signal-conditioning op-amps. The 4-channel input MUX allows a single IC to scan 4 process variables; with multiple chips, an 8/16/32-channel analog input card is straightforward. The parallel 16-bit interface simplifies register-mapped micro-controller bus connections without an external shift register or SPI bridge. Compared to discrete sigma-delta modulators, the SAR ADC provides faster settling and lower group delay for closed-loop control applications.
Recommended
Automotive Sensor Readback
The MAX1166ACUP+T (or its extended-temperature variant MAX1166AEUP+) fits in-cabin and chassis-area automotive sensor readback modules where multiple sensors (pedal position, throttle, suspension position, battery monitor) need 16-bit accuracy and bipolar input handling. The TSSOP-20 package is automotive-viable when paired with the -E temperature grade variant. The integrated 4-channel MUX and internal reference reduce PCB area in ECU modules where board space is at a premium. For under-hood or powertrain applications above 85C, the MAX1166BEUP+T extended-temperature variant is recommended.
Recommended
Test and Measurement Instrumentation
The MAX1166ACUP+T suits bench-top test and measurement instrumentation (data acquisition systems, oscilloscope front-ends, signal source calibration) because 16-bit no-missing-codes performance and +/-10V bipolar input range provide the accuracy and dynamic range required for general-purpose lab measurements. The SAR architecture's deterministic single-cycle latency simplifies trigger timing in digitizer subsystems. The internal +4.096V reference is sufficient for many measurement grades without an external reference. Compared to audio-band sigma-delta ADCs, the 200 ksps bandwidth captures higher-frequency signals while still providing the DC accuracy needed for instrumentation.
Recommended
Recommended Products Summary
Engineering reference data for MAX1166ACUP+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1166BCUP+ | MAX1166BEUP+ | MAX1166ACUP+ | MAX1166AEUP+ | MAX1165ACUP+ | MAX1147BEUP+ |
|---|---|---|---|---|---|---|---|
| Package | TSSOP-20 | TSSOP-20 - same | TSSOP-20 - same | TSSOP-20 - same | TSSOP-20 - same | TSSOP-20 - same | TSSOP-20 - same |
| Brand | Analog Devices (Maxim Integrated) | Analog Devices - same brand | Analog Devices - same brand | Analog Devices - same brand | Analog Devices - same brand | Analog Devices - same brand | Analog Devices - same brand |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 12 bits |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 8 | 4 |
Key Differentiators
- Integrated 4-channel input multiplexer with bipolar +/-10V inputs (vs MAX1147BEUP+)
- On-chip +4.096V reference trimmed to 0.01% (vs MAX1067BCEE)
- Single +5V analog supply operation (vs MAX1139MEEE+)
- SAR architecture with deterministic single-cycle latency (vs MAX1134BCAP+)
Design Notes
Decouple the analog +5V supply (AVDD, pin 7) with a 10 uF tantalum or ceramic plus a 0.1 uF ceramic placed within 5 mm of the pin. Decouple the digital supply (DVDD, pin 8) with a separate 0.1 uF ceramic - sharing decoupling between analog and digital pins can couple switching noise into the conversion result. Tie the REF pin (pin 6) bypass with a 4.7 uF plus 0.1 uF ceramic as close to the pin as practical. Estimated: assuming a 5 V analog supply and 2.5 mA active current, the AVDD regulator must deliver at least 50 mA to accommodate transient bursts during conversions.
Route the analog input traces (AIN0-AIN3) as guard-ringed differential pairs with the ground plane uninterrupted beneath them. Keep analog input traces at least 5 mm away from the parallel digital output bus (D9-D15) and clock lines (CLK, CONVST, RD, CS) to avoid capacitive coupling into the sample-and-hold. Place a ground pour on the top layer stitched with vias to the inner ground plane under the IC body. Estimated: a 5 mm trace-to-trace spacing typically yields 60-70 dB crosstalk rejection at 200 ksps bandwidth.
Add 50 ohm series damping resistors at the digital output pins (D9-D15) if the digital bus drives traces longer than 25 mm to prevent ringing and reflections at the parallel interface edges. Keep CONVST and CLK rise times less than 10 ns for clean sampling - slower edges can introduce aperture jitter. Place a 0.1 uF ceramic decoupling at every 2 digital output pins if the bus drives a high-capacitive-load FPGA bus.
Do not operate the part without the AVDD supply present even in power-down mode; the internal logic requires AVDD to retain calibration coefficients. Do not apply analog inputs greater than +/-16 V without external clamping - exceeding this can permanently damage the input ESD structures. Do not skip the REF bypass capacitor - missing REF decoupling causes excessive conversion noise and gain error. Do not use long (>50 mm) unshielded analog input cables - common-mode pickup will swamp the 16-bit dynamic range.
The TSSOP-20 package has a theta_JA of approximately 110 C/W in still air, so at the 2.5 mA typical operating current and 5 V supply, the part dissipates about 12.5 mW. Estimated: junction temperature rise above 25 C ambient is approximately 1.4 C, well within the 70 C COMMERCIAL rating with substantial margin. Extended-temperature variants (MAX1166AEUP+) operate up to 85 C ambient with the same thermal margin.
Compliance Information
Lead-free and RoHS-compliant per Maxim Integrated product family. Not AEC-Q100 qualified; for automotive applications, consider the MAX1166AEUP+ extended-temperature variant. Always verify the specific lot date code with the manufacturer for automotive safety-critical designs.
