MAX177CNG+ - 10-Bit 100kSPS SAR ADC, 24-PDIP | Maxim Integrated
MPN: MAX177CNG+ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.42 | $13.42 |
| 10 | $11.85 | $118.50 |
| 100 | $10.21 | $1,021.00 |
| 500 | $9.05 | $4,525.00 |
| 1,000 | $7.88 | $7,880.00 |
MAX177CNG+ Overview
A SAR ADC (Successive-Approximation-Register Analog-to-Digital Converter) is a type of Nyquist-rate data converter that uses a binary-search algorithm against an internal precision DAC to determine each digital output code. Within the broader converter hierarchy, the MAX177 sits in the medium-speed precision SAR family, between low-power delta-sigma audio converters and high-speed pipeline/video ADCs. SAR ADCs are favored when deterministic latency, single-shot conversion capability, and low-latency digital readout are required.
Key features include 10-bit resolution, a single-ended analog input channel, 100 ksps maximum sampling rate, an internal sample-and-hold, parallel digital output, and a built-in +2.5V reference option that can also be overridden with an external reference. The MAX177CNG+ consumes modest supply current and supports a commercial temperature grade, suiting bench instrumentation, factory automation, and embedded datalogger designs where a through-hole part simplifies prototyping.
The MAX177CNG+ uses Maxim's classic CMOS SAR core with charge-redistribution DAC switching, providing excellent DC linearity and low noise at the 100 ksps throughput. The 24-pin PDIP form factor makes the part breadboard-friendly and socket-compatible for educational, replacement, and legacy maintenance applications where surface-mount conversion is not required.
Typical applications include single-channel 4-20 mA loop digitizers, transducer signal conditioning outputs, bench-top multimeter front ends, industrial controller analog inputs, and digital oscilloscope scaling/calibration digitizers. The single +5V supply simplifies integration alongside 8051, PIC, and AVR microcontrollers without auxiliary analog rails.
When designing with the MAX177CNG+, ensure the analog input driving bandwidth is appropriate for the track-and-hold acquisition time and provide adequate bypassing on VDD and VREF. Add a small RC anti-alias filter ahead of the analog input pin to attenuate out-of-band noise before sampling.
This page synthesizes distributor pricing across DigiKey/Mouser/Octopart, drop-in package-compatible alternatives, and practical SAR ADC design notes not consolidated in any single source.
Drop-in alternatives for MAX177CNG+ — 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 MAX177CNG+ (same form factor and footprint) — differing in Package, Resolution, Mounting Type, Operating Temperature Range, Output Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX177CNG
✅ Drop-In📋 Reference alternative (not in catalog)
MAX176ACPA
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$17.2 / Unit
View Datasheet →MAX174BEPI
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$8.75 / Unit
View Datasheet →MAX174ACWI
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$12.25 / Unit
View Datasheet →MAX173CWG
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$8.95 / Unit
View Datasheet →MAX177CNG+ Maximum Ratings & Electrical Characteristics
| Resolution | 10 bit |
| Sampling Rate | 100 ksps |
| Architecture | SAR (Successive Approximation) |
| Input Channels | 1 single-ended |
| Input Type | Single Ended |
| Data Interface | Parallel |
| Configuration | S/H-ADC (Track-and-Hold + ADC) |
| Supply Voltage | +5 V (single supply) |
| Reference | Internal +2.5 V or external |
| Digital Output | Parallel, microprocessor-compatible |
| Package | 24-PDIP (Through-Hole) |
| Pin Count | 24 |
| Mounting Type | Through-Hole (DIP) |
| Temperature Grade | Commercial |
| RoHS Status | Compliant (Pb-free '+' suffix) |
| Conversion Latency | Deterministic (SAR type, single-cycle) |
MAX177CNG+ Pin Configuration
| Pin 1 | VDD — +5V analog supply |
| Pin 2 | AIN — Analog input (single-ended) |
| Pin 3 | REF — Reference input/output (internal +2.5V or external) |
| Pin 4 | AGND — Analog ground |
| Pin 5 | CS — Chip select (active low) |
| Pin 6 | RD — Read strobe (active low) |
| Pin 7 | WR/CONV — Write/convert start (active low) |
| Pin 8 | INT — Interrupt / conversion complete (active low) |
| Pin 9 | DB0 — Data bit 0 (LSB) |
| Pin 10 | DB1 — Data bit 1 |
| Pin 11 | DB2 — Data bit 2 |
| Pin 12 | DB3 — Data bit 3 |
| Pin 13 | DB4 — Data bit 4 |
| Pin 14 | DB5 — Data bit 5 |
| Pin 15 | DB6 — Data bit 6 |
| Pin 16 | DB7 — Data bit 7 |
| Pin 17 | DB8 — Data bit 8 |
| Pin 18 | DB9 — Data bit 9 (MSB) |
| Pin 19 | DGND — Digital ground |
| Pin 20 | DVDD — Digital +5V supply |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | NC — Not connected (per datasheet) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
Typical Applications
MAX177CNG+ is suitable for 6 applications: Industrial Process Control Analog Input, Bench-Top Multimeter and Instrumentation Digitizer, Transducer Signal Conditioning Output Digitizer, Embedded Data Logger / Datalogger Front End, Audio VU Meter and Analog Level Indicator, Digital Oscilloscope Scale / Calibration Digitizer.
Industrial Process Control Analog Input
The MAX177CNG+ fits industrial process control front ends where a single-ended 0-5V transducer signal must be digitized at up to 100 ksps for PLC or SCADA input modules. Its 10-bit resolution provides 4.88 mV LSB on a 5V full-scale input, sufficient for thermocouple-amplified, pressure-transducer, and 4-20 mA shunt-monitor channels. The parallel digital output interfaces directly with 8051, PIC, and AVR microcontrollers without a serial handshake, simplifying firmware latency. The 24-PDIP through-hole package is preferred for industrial control cabinets that require socketed replacement and through-hole soldering reliability in high-vibration environments.
Recommended
Bench-Top Multimeter and Instrumentation Digitizer
The MAX177CNG+ provides 10-bit 100 ksps digitization suitable for bench-top multimeter front ends and educational instrumentation where manual probing and signal visualization are required. The integrated sample-and-hold eliminates external amplifier timing concerns, while the parallel output streams conversion results to LCD drivers or PC parallel-port interfaces. With a true 5V input range and 10-bit resolution, the MAX177CNG+ offers 4.88 mV resolution - adequate for hobbyist electronics, physics-lab experiments, and entry-level instrumentation. The 24-PDIP form factor accepts socketed installation for easy classroom swapping and experiment variation.
Recommended
Transducer Signal Conditioning Output Digitizer
Bridge sensors, strain gauges, load cells, and pressure transducers require precise digitization after amplification. The MAX177CNG+ accepts amplified transducer signals (typically 0-5V single-ended) and outputs parallel 10-bit codes at up to 100 ksps, suitable for weighing-scale readouts, force-feedback systems, and hydraulic pressure monitors. The internal +2.5V reference provides adequate absolute accuracy for industrial weighing; for higher-precision applications, an external reference such as MAX6341 or AD584 can be applied to the REF pin. The deterministic SAR conversion latency simplifies real-time control loops where predictable sampling is required.
Recommended
Embedded Data Logger / Datalogger Front End
Battery-powered embedded dataloggers for environmental monitoring, asset tracking, and field telemetry require a low-component-count ADC front end. The MAX177CNG+ integrates sample-and-hold, reference, and 10-bit SAR core into a single 24-PDIP IC, reducing BOM cost and PCB area. With single +5V supply operation and parallel output to microcontrollers, the part fits data acquisition systems built around 8051, PIC16/18, or ATmega microcontrollers without requiring additional analog rails. The 100 ksps rate allows logging multiple channels via external analog multiplexer at aggregate rates suitable for slow-changing environmental signals.
Recommended
Audio VU Meter and Analog Level Indicator
Audio VU meters, peak-hold indicators, and spectrum-analyzer front-end digitizers require sampling rates above the audio Nyquist limit. The MAX177CNG+ at 100 ksps comfortably exceeds the 44.1 kHz audio Nyquist requirement when used in audio-band measurement applications. Its 10-bit resolution provides 0.05% theoretical dynamic range - more than sufficient for VU display and peak-detection purposes. The single +5V supply matches typical audio codec AVDD rails, simplifying power architecture in consumer audio test equipment and consumer HiFi measurement gear.
Recommended
Digital Oscilloscope Scale / Calibration Digitizer
Digital oscilloscopes, logic analyzer calibration fixtures, and ATE (Automatic Test Equipment) calibration boards use SAR ADCs like the MAX177CNG+ for digitizing DC reference voltages, calibration constants, and self-test signals. The 10-bit 100 ksps throughput is well matched to the slow-changing DC calibration signals and self-test routines typical in such equipment. The parallel output simplifies integration with legacy test-bus architectures, and the through-hole PDIP package allows easy replacement during calibration-stand maintenance.
Recommended
Recommended Products Summary
Engineering reference data for MAX177CNG+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX177CNG | MAX176ACPA | MAX174BEPI | MAX173CWG |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-PDIP | 24-PDIP - same | 24-PDIP - same | 24-PDIP - same | 24-PDIP - same |
| Resolution | 10 bit | 10 bit | 12 bit | 12 bit | 12 bit |
| Architecture | SAR | SAR | SAR | SAR | SAR |
Key Differentiators
- Higher sampling rate vs MAX173CWG in same family (vs MAX173CWG)
- Integrated +2.5V reference (vs MAX174BEPI)
- Single +5V supply operation (vs MAX174BEPI)
Design Notes
Estimated: at +5V supply with 100 ksps continuous sampling, the MAX177CNG+ draws typical supply current around 4-6 mA. For best noise performance, decouple VDD (pin 1) and DVDD (pin 20) with separate 0.1 µF ceramic capacitors placed within 5 mm of the pins. Add a bulk 10 µF tantalum or electrolytic capacitor on the supply rail for high-frequency load-step rejection. Star-ground the analog and digital grounds back at a single point near the voltage regulator to avoid digital switching noise coupling into the analog input.
Route the analog input trace as a microstrip guarded by ground pours on both sides. Keep digital output traces (DB0-DB9) away from the analog input and reference traces to minimize digital-to-analog crosstalk. Place the external reference bypass capacitor directly at the REF pin. If using the internal +2.5V reference, add 10 µF + 0.1 µF decoupling at the REF pin. Use a guard ring around the analog input pin tied to analog ground to absorb leakage currents from the PCB substrate.
Add a small anti-aliasing RC filter (typically 1 kΩ + 1 nF giving 160 kHz cutoff) ahead of the analog input pin to attenuate out-of-band noise above the Nyquist limit of the 100 ksps sample rate. The op-amp driving the input must settle within the sample-and-hold acquisition time (typically < 1 µs) - use a wideband buffer such as MAX478 or AD826 for low-impedance drive. Avoid source impedances above 1 kΩ to prevent gain-error degradation in the track-and-hold.
Compliance Information
RoHS-compliant Pb-free lead finish confirmed by '+' suffix per Maxim Integrated datasheet. REACH, halogen-free, and conflict-mineral status not explicitly listed in the verified web data - flag as unknown.
