MAX165BCWN - 5µs 8-Bit ADC with Track/Hold, SOIC-18 | Maxim Integrated
N.º de pieza: MAX165BCWN ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $19.03 | $19,03 |
| 10 | $17.5 | $175,00 |
| 100 | $15.2 | $1.520,00 |
| 500 | $13.85 | $6.925,00 |
| 1.000 | $12.4 | $12.400,00 |
MAX165BCWN Descripción general
An ADC (analog-to-digital converter) is a data-acquisition component that converts continuous analog voltages into discrete digital codes. Within the converter hierarchy, the MAX165 is a successive-approximation-register (SAR) ADC, the dominant topology for medium-speed multi-MHz-to-low-MHz applications because it offers deterministic latency, no pipeline delay, and excellent DC accuracy. SAR ADCs sit beneath the broader categories of data converters and signal-chain ICs, and are commonly used as the final digitizing stage between analog sensors and a host microcontroller or processor.
The defining features of the MAX165 include a 5µs conversion time (200 kSPS throughput), an on-chip track/hold capable of acquiring full-scale signals up to 50kHz (386 mV/µs slew rate), and an internal low-drift buried-zener reference. The 18-SOIC wide-body package provides 18 gull-wing pins on 0.300" body width, allowing hand-soldering and easy prototyping. The commercial-grade temperature range (0°C to +70°C) targets bench-top instrumentation, industrial control boards, and embedded data-acquisition systems.
Architecturally, the MAX165 uses a capacitive charge-redistribution SAR core with an auto-zeroed input comparator and a track/hold front end, achieving ±1 LSB total unadjusted error and excellent linearity without user calibration. The internal reference is trimmed to ±1% and can be overdriven by an external reference for applications requiring tighter absolute accuracy or a different full-scale range.
Typical applications include digital panel meters, portable instrumentation, process-control analog front ends, weigh scales, and embedded data-acquisition cards for 8-bit microcontrollers such as the 8051, 68HC11, or Z80. Designers select the MAX165 specifically when they need an 8-bit ADC with built-in reference and track/hold, parallel interface, and minimal external component count on a single +5V rail.
When designing with this part, note that the wide SOIC package and 0.295" (7.5 mm) body width require larger PCB land patterns than the narrow-body SOIC-18. The internal reference pin (REF) should be bypassed with 4.7µF minimum to preserve ADC noise performance, and analog/digital grounds should be tied at a single point under the IC.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for evaluating the MAX165BCWN against current sourcing options and modern replacements.
Alternativas directas para MAX165BCWN — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MAX165BCWN (mismo factor de forma y huella) — difiere en Package, Operating Temperature, Conversion Time, Data Interface, Input Voltage Range.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MAX165BCWN+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX165BEWN+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX165ACWN
✅ Sustitución directa✓ En stock
$4.2 / unidad
Ver hoja de datos →MAX165ACWN+
✅ Sustitución directa✓ En stock
$7.4 / unidad
Ver hoja de datos →MAX165AEWN+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX165CEWN+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX165BCWN Valores máximos y características eléctricas
| Resolución | 8 bit |
| Conversion Time | 5 µs |
| Frecuencia de muestreo | 200 kSPS |
| Number of Channels | 1 |
| Input Type | Single-Ended (MAX165) / Differential (MAX166) |
| Rango de tensión de entrada | 0 V to 2×VREF (≈ 2.46 V with internal reference) |
| Architecture | SAR (Successive Approximation Register) |
| Data Interface | Parallel (8-bit) with CS, RD control signals |
| Tensión de alimentación | +5 V ±5% (single supply) |
| Internal Reference | +1.23 V (can be overdriven externally) |
| Track/Hold Bandwidth | Full-scale signals up to 50 kHz (386 mV/µs slew rate) |
| Temperatura de funcionamiento | 0°C to +70°C (commercial grade) |
| Encapsulado | 18-SOIC (Wide, 0.300") |
| Package Body Width | 7.50 mm (0.295") |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant (lead-free available on '+' variants) |
| Nivel MSL | 1 |
Configuración de pines de MAX165BCWN
| Pin 1 | VDD — Positive analog/digital supply, +5V ±5% |
| Pin 2 | VREF — Reference input/overdrive pin (internal +1.23V source) |
| Pin 3 | REF — Reference bypass/decoupling node |
| Pin 4 | AGND — Analog ground return |
| Pin 5 | AIN — Analog single-ended input (MAX165); differential ±AIN (MAX166) |
| Pin 6 | CS — Chip-select input, active low |
| Pin 7 | RD — Read input, active low; initiates conversion on falling edge |
| Pin 8 | INT — Interrupt output, signals end-of-conversion |
| Pin 9 | DB0 — Data bit 0 (LSB), high-Z when CS high |
| Pin 10 | DB1 — Data bit 1, high-Z when CS high |
| Pin 11 | DB2 — Data bit 2, high-Z when CS high |
| Pin 12 | DB3 — Data bit 3, high-Z when CS high |
| Pin 13 | DB4 — Data bit 4, high-Z when CS high |
| Pin 14 | DB5 — Data bit 5, high-Z when CS high |
| Pin 15 | DB6 — Data bit 6, high-Z when CS high |
| Pin 16 | DB7 — Data bit 7 (MSB), high-Z when CS high |
| Pin 17 | DGND — Digital ground return |
| Pin 18 | VDD — Positive digital supply, +5V ±5% (tie to pin 1) |
Aplicaciones típicas
MAX165BCWN es adecuado para 6 aplicacións: Digital Panel Meters, Industrial Process Control Front Ends, Portable Instrumentation and Data Loggers, Weigh Scales and Load-Cell Digitizers, Embedded 8-Bit Microcontroller Data Acquisition, Audio Signal-Level Meters and VU Indicators.
Digital Panel Meters
The MAX165BCWN's 8-bit resolution, internal +1.23V reference, and integrated track/hold make it an ideal ADC for 3.5-digit and 4.5-digit digital panel meters measuring voltage, current, temperature (via thermistor/thermocouple front end), or pressure (via bridge sensor). Placed between the analog signal-conditioning front end and the 8-bit microcontroller display driver, the parallel data bus provides direct connection to a wide range of low-cost 8051-family MCUs without latches or glue logic. The 200 kSPS throughput supports update rates above 5 Hz with plenty of margin for software averaging to suppress mains-noise pickup. The 18-SOIC wide-body package is also easy to hand-solder in meter-scale builds.
Recomendado
Industrial Process Control Front Ends
In PLC analog-input modules and 4-20 mA loop digitizers, the MAX165BCWN provides the 8-bit conversion front end between field sensors and the controller's processor bus. The single +5V supply requirement simplifies isolated 24V-to-5V power designs, and the integrated track/hold handles industrial signals with up to 50 kHz bandwidth. Industrial control designers select this part for its deterministic SAR conversion (no pipeline delay), proven ±0.5 LSB INL accuracy, and standard parallel CS/RD interface that drops directly onto legacy 8-bit MCU buses in existing PLC designs.
Recomendado
Portable Instrumentation and Data Loggers
Battery-powered portable data loggers and handheld instrumentation benefit from the MAX165BCWN's single +5V supply operation and integrated reference, which minimize external component count and BOM size. With 5µs conversion time and 200 kSPS throughput, the converter digitizes sensor waveforms (strain gauges, RTDs, photodiodes) at sample rates suitable for vibration, temperature profiling, and acoustic logging. The internal +1.23V reference is trimmed to ±1%, eliminating the cost of an external reference IC and reducing the total quiescent current draw of the analog front end, which extends battery runtime.
Recomendado
Weigh Scales and Load-Cell Digitizers
Weigh-scale designs use the MAX165BCWN as the ADC that digitizes the differential output of a load-cell bridge (after a low-noise instrumentation amplifier). The 8-bit resolution provides 256 codes of usable dynamic range, suitable for kitchen scales, postal scales, and industrial batching systems where ±0.5% full-scale accuracy is sufficient. The integrated track/hold captures the load-cell settling transient cleanly, while the internal +1.23V reference can be overdriven by an external 2.5V reference when higher absolute accuracy is required across the temperature range.
Recomendado
Embedded 8-Bit Microcontroller Data Acquisition
When paired with 8-bit microcontrollers such as the 8051, 68HC11, Z80, or PIC16, the MAX165BCWN provides direct bus-mapped data acquisition with no glue logic. The CS and RD signals map to standard memory-mapped peripheral control lines, and the 8-bit parallel data bus drops directly onto the MCU data port. Designers select this part because the parallel interface avoids the timing complexity of SPI/I2C ADCs at the 200 kSPS throughput, and the 18-pin SOIC footprint fits alongside legacy MCU peripherals on standard 0.1" through-hole prototyping boards.
Recomendado
Audio Signal-Level Meters and VU Indicators
Although the MAX165BCWN is not an audio-bandwidth converter, it serves well in audio signal-level meters, VU indicators, and peak-detector digitizers where 8-bit resolution and 200 kSPS throughput are more than sufficient to capture envelope-followed audio levels. Placed after a rectifier/peak-detect front end and a logarithmic gain stage, the ADC drives a microcontroller that displays the audio level on an LED bar or LCD. The integrated track/hold provides clean sample-and-hold of slow-moving envelope signals without droop, and the parallel data bus allows direct updating of the level display without software bit-banging.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX165BCWN — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX165BCWN+ | MAX165BEWN+ | MAX165ACWN | MAX165ACWN+ |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 18-SOIC (Wide, 0.300") | 18-SOIC (Wide, 0.300") - same | 18-SOIC (Wide, 0.300") - same | 18-SOIC (Wide, 0.300") - same | 18-SOIC (Wide, 0.300") - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Conversion Time / Throughput | 5 µs / 200 kSPS | 5 µs / 200 kSPS | 5 µs / 200 kSPS | 5 µs / 200 kSPS | 5 µs / 200 kSPS |
| Integral Linearity (INL) | ±0.5 LSB (B grade) | ±0.5 LSB (B grade) | ±0.5 LSB (B grade) | ±1 LSB (A grade) | ±1 LSB (A grade) |
| Temperature Range | 0°C to +70°C (Commercial) | 0°C to +70°C (Commercial) | -40°C to +85°C (Industrial) | 0°C to +70°C (Commercial) | 0°C to +70°C (Commercial) |
| Supply Voltage | +5 V ±5% single supply | +5 V ±5% | +5 V ±5% | +5 V ±5% | +5 V ±5% |
| Internal Reference | +1.23 V (overdrivable) | +1.23 V (overdrivable) | +1.23 V (overdrivable) | +1.23 V (overdrivable) | +1.23 V (overdrivable) |
| Interface | Parallel 8-bit, CS/RD/INT | Parallel 8-bit, CS/RD/INT | Parallel 8-bit, CS/RD/INT | Parallel 8-bit, CS/RD/INT | Parallel 8-bit, CS/RD/INT |
Diferenciadores clave
- Tightest linearity grade available in 18-SOIC footprint (frente a MAX165ACWN)
- Lower cost than the extended-temperature variant (frente a MAX165BEWN+)
- Lead-free RoHS variant available as drop-in upgrade (frente a MAX165BCWN+)
- Highest sampling rate among 8-bit SAR ADCs in this pin-compatible family (frente a MAX165CEWN+)
Notas de diseño
Use a wide 18-SOIC (0.295" body) land pattern with at least 0.5 mm of copper pour extending from the analog (AGND, pin 4) and digital (DGND, pin 17) ground pins to a star-ground under the IC. According to the Maxim datasheet, AGND and DGND should be tied together at a single point on the PCB (typically the exposed pad under the IC or a ground plane directly beneath the package) to prevent digital switching currents from coupling into the analog input. Bypass VDD (pins 1 and 18) with a 0.1µF ceramic capacitor placed within 3 mm of each pin, and add a bulk 10µF tantalum or ceramic capacitor on the same supply node.
The MAX165BCWN draws approximately 6 mA from its +5V supply during conversion and less than 1 mA in standby. When overdriving the internal reference, the external reference must source the REF pin's bias current (typically 0.5 mA) plus any external reference-load current; the reference output impedance should be below 10Ω to preserve ADC noise performance. According to the Maxim datasheet, when using the internal reference, pin 3 (REF) must be bypassed with at least 4.7µF (tantalum or ceramic) to filter reference noise, which directly impacts ADC SNR.
Do not leave the VREF pin floating; it must be tied either to the internal reference (REF, pin 3) or to an external reference source. Floating VREF causes the input range to collapse and conversion results to be non-deterministic. Also note that RD (pin 7) is edge-triggered - a falling edge initiates a conversion, so the MCU must issue a single read pulse no shorter than 50 ns and no longer than 5 µs. Finally, when reading the result, ensure CS is asserted before RD goes low; otherwise the parallel bus remains in high-Z and the read produces undefined data.
The MAX165BCWN's track/hold can accurately acquire signals with slew rates up to 386 mV/µs, equivalent to a full-scale bandwidth of approximately 50 kHz. For higher-bandwidth inputs, place a low-pass anti-aliasing filter ahead of AIN (pin 5) with a cutoff at or below 50 kHz. The input impedance of AIN is capacitive (approximately 16 pF during acquisition); add a wideband buffer amplifier (e.g., MAX4208) if the source impedance exceeds 1 kΩ, otherwise aperture-time errors and DC bias current will degrade linearity.
Información de cumplimiento
RoHS compliance achieved via the lead-free MAX165BCWN+ variant; the non-'+' MAX165BCWN may be non-RoHS. AEC-Q100 not applicable (commercial/industrial grade, not automotive). Halogen-free status not stated in verified data.
