MAX120CNG+ - 12-Bit 500ksps SAR ADC | Maxim Integrated
N.º de pieza: MAX120CNG+ ✗ Fin de vidaMAX120CNG+ Descripción general
An ADC is a data-acquisition interface that converts an analog voltage into a digital number. Within the hierarchy of analog-to-digital converters, the MAX120CNG+ is a sampling SAR ADC with an integrated track-and-hold function. Successive-approximation conversion repeatedly compares the sampled input with a generated reference voltage, determining each output bit from the most significant bit to the least significant bit. This architecture is appropriate when a compact converter with moderate resolution and rapid sampling is needed.
The headline characteristics are 12-bit resolution, a 500 ksps conversion rate, one analog input, SAR conversion, and a 24-pin PDIP package. The manufacturer datasheet identifies the MAX120/MAX122 family as complete BiCMOS sampling ADCs that combine an on-chip track-and-hold circuit, a low-drift voltage reference, fast conversion speeds, and low power consumption. These integrated functions reduce the number of external analog-support components required in a measurement circuit.
The MAX120CNG+ uses a 5 V precision ADC configuration and is suited to acquiring rapidly changing or repetitive analog waveforms. A 500 ksps sampling capability permits dense acquisition when the system must observe short-duration events, while 12-bit output resolution provides 4,096 digital codes. The integrated track-and-hold isolates the sampling instant from the input during conversion, reducing the need for external sample-and-hold circuitry.
Typical applications include industrial process monitoring, laboratory instrumentation, sensor signal acquisition, digital control systems, and embedded measurement platforms. In each case, the analog front end should scale the sensor output into the converter input range, and the system should provide suitable bypassing and grounding to preserve conversion accuracy.
The principal design consideration is input conditioning. Keep the analog trace short, place bypass capacitors near the supply pins, and route return currents away from the analog input. Use the manufacturer pin-description table when assigning PCB tracks because the input, reference, digital interface, power, and ground connections have distinct roles in the conversion system.
This page organizes the confirmed MAX120CNG+ characteristics, pin-compatible replacement information, application guidance, comparison parameters, and PCB design notes into a practical engineering reference for evaluating this 12-bit, 500 ksps SAR ADC.
Alternativas directas para MAX120CNG+ — 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 MAX120CNG+ (mismo factor de forma y huella) — difiere en Input Type, Track and Hold.
MAX120ENG+
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Ver hoja de datos →MAX120CNG+ Valores máximos y características eléctricas
| Resolución | 12 bit |
| Frecuencia de muestreo | 500 ksps |
| Input Channel Count | 1 channel |
| Conversion Architecture | Successive approximation (SAR) |
| Input Type | Single-ended analog input |
| Track and Hold | On-chip track-and-hold |
| Internal Reference | On-chip low-drift voltage reference |
| Process Technology | BiCMOS |
| Tensión de alimentación | 5 V |
| Encapsulado | 24-pin PDIP |
| Recuento de pines | 24 pins |
| Tipo de montaje | Through-hole |
Guía de configuración de pines de MAX120CNG+ 24-pin pdip
Configuración de pines para MAX120CNG+ (encapsulado 24-pin pdip). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para MAX120CNG+.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MAX120CNG+ es adecuado para 6 aplicacións: Industrial Process Monitoring, Laboratory Instrumentation, Sensor Signal Acquisition, Digital Control Systems, Waveform Data Acquisition, Embedded Measurement Platforms.
Industrial Process Monitoring
The MAX120CNG+ fits industrial process-monitoring systems that acquire a conditioned sensor voltage and convert it into a 12-bit digital measurement. Its 500 ksps sampling rate supports rapid sampling, while the 12-bit resolution provides 4,096 discrete code levels. The integrated track-and-hold defines the acquisition interval, and the on-chip low-drift reference supports a compact measurement front end. Place the converter near the analog input, use short traces, and separate analog return paths from digital switching currents. The input amplifier or passive network must scale the process signal into the device's permitted analog range and provide any required protection.
Laboratory Instrumentation
The MAX120CNG+ is appropriate for laboratory instruments that digitize a controlled analog measurement while balancing resolution, speed, and circuit simplicity. The 500 ksps sampling rate can capture repetitive waveforms or short events, while 12-bit resolution supports general-purpose bench measurements. Its integrated track-and-hold and low-drift reference reduce the number of discrete support components. For best performance, terminate the source carefully, keep the analog-input trace short, bypass the supply close to the device, and provide a quiet ground reference. Calibration should account for the actual reference, input-conditioning, and leakage characteristics of the completed instrument.
Sensor Signal Acquisition
The MAX120CNG+ can serve as the ADC stage in a sensor acquisition front end where a scaled analog output must be converted for a controller or processor. A single analog input and 12-bit conversion resolution suit many temperature, pressure, position, and level measurements after appropriate amplification or attenuation. The 500 ksps rate is more than adequate for many slowly changing sensor outputs and adds timing margin for multiplexed acquisition. Use the on-chip track-and-hold behavior to define when the sensor value is captured, and apply filtering at the source when sensor noise or bandwidth would otherwise overwhelm the 12-bit result.
Digital Control Systems
The MAX120CNG+ supports digital control loops that use analog feedback as the system variable. The 500 ksps sampling capability permits regular updates, and the 12-bit output offers 4,096 digital steps for representing the conditioned control signal. The single-input architecture is suitable for one critical analog feedback channel rather than a multichannel data-acquisition system. Keep the controller and converter grounds arranged to minimize switching disturbance, establish an acquisition schedule that accounts for conversion timing, and check that the sensor excitation or actuator feedback remains within the converter's permitted analog range.
Waveform Data Acquisition
The MAX120CNG+ can acquire repetitive analog waveforms in a compact data-acquisition system because its 500 ksps sampling rate is substantially faster than the 12-bit resolution alone would imply. The track-and-hold function establishes the sampling instant and minimizes input movement during conversion, while the internal low-drift reference simplifies the support circuitry. For accurate waveform capture, maintain adequate input bandwidth, avoid long analog routes, and account for conversion time when calculating the effective sampling interval. Apply analog gain before the ADC when the source amplitude is small, because amplification after digitization cannot restore information lost to the converter's input range or resolution.
Embedded Measurement Platforms
The MAX120CNG+ fits embedded measurement platforms that need one analog channel alongside digital control or communication functions. Its 12-bit resolution, 500 ksps operation, and integrated reference and track-and-hold provide a compact acquisition block without requiring a separate external reference for every design. The 24-pin PDIP footprint supports through-hole assembly and prototype rework, although production designs must still observe grounding and decoupling requirements. Use the manufacturer pin table to identify analog, digital, supply, and ground functions, and keep high-current output or processor return paths from crossing the sensitive analog input region.
Datos de referencia de ingeniería para MAX120CNG+ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX120ENG+ |
|---|---|---|
| Package | 24-pin PDIP | 24-pin PDIP |
| Brand | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bit | 12 bit |
| Sampling Rate | 500 ksps | 500 ksps |
| Input Channel Count | 1 channel | 1 channel |
| Conversion Architecture | Successive approximation (SAR) | Successive approximation (SAR) |
| Track and Hold | On-chip track-and-hold | On-chip track-and-hold |
| Internal Reference | On-chip low-drift voltage reference | On-chip low-drift voltage reference |
| Supply Voltage | 5 V | 5 V |
| Pin Compatibility | 24-pin PDIP | Documented as completely replaceable with consistent terminals and package construction |
| Process Technology | BiCMOS | BiCMOS |
Diferenciadores clave
- Direct 24-pin DIP replacement path (frente a MAX120ENG+)
- Same core conversion resolution (frente a MAX120ENG+)
- Same integrated acquisition function (frente a MAX120ENG+)
Notas de diseño
Route the analog input directly to the MAX120CNG+ and keep the input trace short, with no test pads, long jumpers, or high-current switching paths nearby. Connect supply bypass capacitors close to the relevant device pins and provide a continuous ground reference for the analog return current. Separate digital signals from the analog input where possible, and use the manufacturer package drawing to verify orientation and pin numbering before fabrication.
Treat the MAX120CNG+ as a precision 12-bit conversion front end even though it is categorized as a general-purpose ADC. Scale the source signal to use the useful input range, limit bandwidth to the required measurement band, and consider input filtering where wideband noise could consume code space. Confirm acquisition timing with the conversion-time specification in the manufacturer datasheet and avoid changing the analog voltage significantly during the track-and-hold interval.
Do not substitute a converter solely because both devices are 12-bit ADCs or use the same number of package pins. For MAX120CNG+, the documented drop-in candidate is MAX120ENG+, whose terminal arrangement and package construction are stated to be consistent. Verify the complete pin descriptions, supply requirements, analog range, timing, and temperature limits in the manufacturer datasheets before replacing the original device.
Información de cumplimiento
No specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration was identified for MAX120CNG+. AEC-Q100 qualification is not applicable to this general-purpose commercial ADC.