MAX1133BEAP+G077 - 16-Bit 200ksps SAR ADC, 5V | Analog Devices
MPN: MAX1133BEAP+G077 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $89.99 | $89.99 |
| 10 | $84.5 | $845.00 |
| 100 | $76.2 | $7,620.00 |
| 500 | $68.4 | $34,200.00 |
| 1,000 | $61.1 | $61,100.00 |
MAX1133BEAP+G077 Overview
A successive-approximation ADC (SAR ADC) is a sampled-data converter that performs a binary search across an internal capacitive DAC to resolve each conversion in one cycle of the bit-clock. SAR ADCs are valued for their deterministic latency, lack of pipeline delay, and excellent DC accuracy, making them the preferred architecture for multiplexed data-acquisition systems, industrial-control front ends, and instrumentation where latency-free conversions matter. The MAX1133 family sits in the precision-industrial tier, offering 16-bit resolution at 200 ksps with an integrated reference to simplify board layout.
Key features of the MAX1133BEAP include a maximum integral nonlinearity (INL) of ±1 LSB and differential non-linearity (DNL) of ±1 LSB (no missing codes), SINAD of 85 dB, signal-to-noise ratio (SNR) of 86 dB, and total harmonic distortion (THD) of -90 dB. The analog input accepts a true bipolar ±12 V or 0 to +12 V range thanks to an internal input scaling/level-shift network, while a unipolar 0 to +4.096 V input can also be applied directly. The device draws 7.5 mA during conversion and drops to a few microamps in shutdown, supporting low-duty-cycle multiplexing strategies.
The MAX1133 is built on a CMOS SAR core with an integrated bandgap reference, calibration logic, and a high-impedance CMOS serial-output port. The 20-pin SSOP package offers a small footprint while keeping analog and digital grounds separated to reduce coupling noise from the serial interface into the analog input. The wide input range, internal reference, and serial interface make the part easy to integrate with modern microcontrollers and DSPs without external signal-conditioning circuitry. Typical applications include industrial process control, multi-channel data-acquisition cards, medical instrumentation, weigh scales, and loop-powered 4-20 mA sensor transmitters.
When designing with the MAX1133BEAP, decouple AVDD and DVDD separately with 0.1 µF ceramic capacitors placed close to the pins, and provide a 10 µF bulk capacitor on AVDD. Route the analog input traces as guard-traced microstrip away from the serial clock and digital outputs, and place a small RC filter (typically 100 Ω and 10 nF) at AIN-ADC to limit out-of-band noise. Because the MAX1133 uses an internal reference, allow a 10 ms settling window after power-up before initiating conversions.
Drop-in alternatives for MAX1133BEAP+G077 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1133BEAP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1133BCAP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1133BCAP+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1133BEAP+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1149BEAP+
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX1133BEAP+G077 Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Sample Rate | 200 ksps |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 input |
| Input Range (Bipolar) | ±12 V (after scaling input scale) |
| Input Range (Unipolar) | 0 to +4.096 V (direct) |
| Analog Supply Voltage (AVDD) | +5 V (4.75 V to 5.25 V) |
| Digital Supply Voltage (DVDD) | +5 V (4.75 V to 5.25 V) |
| Internal Reference | +4.096 V |
| SINAD | 85 dB |
| SNR | 86 dB |
| THD | -90 dB |
| INL (max) | ±1 LSB |
| DNL (max) | ±1 LSB (no missing codes) |
| Supply Current (Conversion) | 7.5 mA |
| Serial Interface | SPI / QSPI / Microwire compatible |
| Package | 20-pin SSOP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
MAX1133BEAP+G077 Pin Configuration
| Pin 1 | AIN+ — Analog input, positive |
| Pin 2 | AIN- — Analog input, negative |
| Pin 3 | AGND — Analog ground |
| Pin 4 | REF — Internal +4.096 V reference bypass |
| Pin 5 | AVDD — +5 V analog power supply |
| Pin 6 | AVDD — +5 V analog power supply |
| Pin 7 | DVDD — +5 V digital power supply |
| Pin 8 | DGND — Digital ground |
| Pin 9 | DOUT — Serial data output |
| Pin 10 | SCLK — Serial clock input |
| Pin 11 | CS — Chip select, active low |
| Pin 12 | CNVST — Convert start, active low |
| Pin 13 | EOC — End of conversion, active low |
| Pin 14 | SHDN — Shutdown, active low |
| Pin 15 | NC — Not connected |
| Pin 16 | NC — Not connected |
| Pin 17 | NC — Not connected |
| Pin 18 | NC — Not connected |
| Pin 19 | NC — Not connected |
| Pin 20 | NC — Not connected |
Typical Applications
MAX1133BEAP+G077 is suitable for 6 applications: Industrial Process Control, Multi-Channel Data Acquisition Systems, Weigh Scales and Load-Cell Instrumentation, Medical Instrumentation, 4-20 mA Loop-Powered Sensor Transmitters, Audio Test and Measurement Equipment.
Industrial Process Control
The MAX1133BEAP+G077 is well-matched to industrial process-control front-ends that digitize ±10 V signals from PLCs, 4-20 mA loop sense circuits, and pressure/transducer outputs. The 85 dB SINAD and ±12 V true-bipolar input range let the ADC accept a 4-20 mA shunt voltage or a bridge sensor output without external op-amp conditioning, while the integrated +4.096 V reference removes the cost of an external reference IC. Placed between the sensor/transducer front end and the host microcontroller's SPI port, the part replaces legacy 12-bit ADCs in PLC modules and HMI panels. Trade-off: 7.5 mA operating current at full 200 ksps limits multiplexed channel count; users running >16 channels should add an external MUX and lower per-channel throughput.
Recommended
Multi-Channel Data Acquisition Systems
For multi-channel data-acquisition cards that stream digitized sensor readings to a host CPU, the MAX1133BEAP+G077 provides 16-bit, 200 ksps, no-missing-codes accuracy in a compact 20-pin SSOP footprint. The lack of pipeline delay (zero-cycle SAR latency) ensures deterministic sampling, which simplifies timing on multiplexed channels and avoids the phase-skew errors that plague pipelined ADCs. Designers pair the MAX1133 with a low-leakage analog multiplexer (e.g., DG408 or 74HC4051) to build 16-/32-channel DAQ cards, and use the 5 V single-supply operation to simplify power-tree design. Compared with external-reference ADCs in the same speed class, the integrated +4.096 V reference cuts BOM by one IC and one decoupling capacitor.
Recommended
Weigh Scales and Load-Cell Instrumentation
Weigh scales and load-cell amplifiers demand 16-bit resolution with low noise to resolve milligram-level force changes - parameters the MAX1133BEAP+G077 delivers through ±1 LSB INL and 86 dB SNR. The integrated +4.096 V reference provides a stable excitation reference for the load-cell bridge when ratiometric readings are used, eliminating temperature drift from an external reference. The 5 V single-supply rail simplifies the scale's analog power tree, and the SPI/QSPI serial interface allows direct connection to a low-cost microcontroller, reducing the BOM to one ADC + one MCU + one load cell. Trade-off: the 7.5 mA conversion current requires careful ground-plane design; decouple AVDD/DVDD separately.
Recommended
Medical Instrumentation
Medical instrumentation - patient monitors, infusion pumps, ECG front ends, and bench-top analyzers - demands the deterministic latency and DC accuracy that the MAX1133BEAP+G077 provides. Its 16-bit resolution and ±1 LSB INL give medical designers enough dynamic range to digitize ±10 mV to ±12 V biosignals after low-noise op-amp conditioning, while the SAR architecture ensures zero pipeline latency (critical for alarm-triggered signals). The integrated +4.096 V reference simplifies medical-grade design files, and the SPI/Microwire serial port reduces pin count on the host MCU. Compared with lower-resolution 12-bit ADCs, the MAX1133 gives designers a 16x resolution improvement for improved patient-safety thresholds.
Recommended
4-20 mA Loop-Powered Sensor Transmitters
Loop-powered 4-20 mA sensor transmitters digitize pressure, temperature, flow, and level signals and re-transmit them over a 4-20 mA current loop. The MAX1133BEAP+G077 fits this application because of its true ±12 V bipolar input range - the same span as the loop supply - allowing direct digitizing of bridge/thermocouple sensor signals without external signal conditioning. The integrated +4.096 V reference eliminates the need for an external reference IC, saving PCB real estate and BOM cost in the cramped 4-20 mA transmitter housing. Designers pair it with a low-power ARM Cortex-M0 MCU and a XTR105/MAX12900 loop conditioner for a complete IEC 61508 SIL-1 transmitter. Trade-off: 7.5 mA operating current is a significant fraction of the 4 mA loop floor; designers should shut down the ADC between conversions.
Recommended
Audio Test and Measurement Equipment
Audio test-and-measurement analyzers (THD+N meters, audio analyzers, headphone testers) require 16-bit or higher dynamic range with low total harmonic distortion - the MAX1133BEAP+G077 delivers 85 dB SINAD and -90 dB THD in this speed tier. Audio designers use the MAX1133 to digitize 0 to +12 V audio test signals from DUTs after gain conditioning, then forward samples to a DSP for FFT-based THD+N analysis. The 16-bit resolution and ±1 LSB INL provide enough dynamic range to characterize most consumer audio DACs and headphone amplifiers. Compared with dedicated audio ADCs, the MAX1133 sacrifices some dynamic range but gains an industrial ±12 V input - ideal for bench-test instrumentation.
Recommended
Recommended Products Summary
Engineering reference data for MAX1133BEAP+G077 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1133BEAP+ | MAX1133BCAP+ | MAX1133BCAP+T | MAX1133BEAP+T | MAX1149BEAP+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) |
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sample Rate | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps |
| INL (max) | ±1 LSB (E grade) | ±1 LSB (E grade) | ±0.5 LSB (B grade) | ±0.5 LSB (B grade) | ±1 LSB (E grade) | ±1 LSB (E grade) |
| Internal Reference | +4.096 V | +4.096 V | +4.096 V | +4.096 V | +4.096 V | +4.096 V |
| Supply Current | 7.5 mA | 7.5 mA | 7.5 mA | 7.5 mA | 7.5 mA | 7.5 mA |
Key Differentiators
- Internal +4.096 V bandgap reference integrated on-chip (vs External-reference ADCs in the same speed class)
- True ±12 V bipolar input range from on-chip input scaling network (vs 5 V-only-input SAR ADCs)
- Direct SPI/QSPI/Microwire interface without glue logic (vs Parallel-output ADCs in the same resolution class)
Design Notes
Decouple AVDD and DVDD separately with 0.1 µF ceramic capacitors placed within 5 mm of the respective supply pins; add a 10 µF bulk tantalum/ceramic capacitor on AVDD to suppress switching spikes from upstream DC-DC converters. The MAX1133BEAP draws 7.5 mA during conversion, so the regulator headroom must be sized accordingly - use a low-noise LDO such as LC7458 or ADP151 upstream rather than a switching regulator.
Use a 4-layer board with a dedicated ground plane and a separate analog power plane; route AIN+ and AIN as a tightly-coupled differential pair guarded by AGND on both sides. Keep the SPI traces (SCLK, DOUT, CS, EOC) on the digital side of the board and avoid crossing the analog input traces. Place the +4.096 V reference bypass capacitor (10 µF ceramic) within 3 mm of the REF pin to minimize reference noise.
Place a small anti-alias RC filter (typically 100 Ω series + 1 nF to ground) at AIN+ and AIN- to limit broadband RF noise into the ADC's track-and-hold. Use matched 0.1 % thin-film resistors in the bipolar input divider to preserve ±1 LSB INL; avoid wirewound or carbon-film resistors whose tolerance and temperature drift will dominate the system error budget.
Estimated: at the maximum 200 ksps sampling rate, the ADC draws 7.5 mA continuously - shutdown between conversions when the host MCU only needs <1 kHz sample rate to cut average current to <100 µA. Do not exceed +5.25 V on AVDD/DVDD; reverse-polarity protection is not internal. Always allow a 10 ms reference-settling window after power-up or wake-up from SHDN before initiating conversions.
Compliance Information
RoHS and lead-free per Maxim Integrated (now Analog Devices) product page; REACH compliance not explicitly listed (treated as compliant by default for EU distribution). Not AEC-Q100 qualified - the MAX1149 is the automotive-grade variant in the same SSOP-20 footprint.
