MAX159BCPA - 10-bit 108ksps 2-Ch Serial ADC | Maxim Integrated
N.º de pieza: MAX159BCPA ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.92 | $6,92 |
| 10 | $6.27 | $62,70 |
| 100 | $5.54 | $554,00 |
| 500 | $4.95 | $2.475,00 |
| 1.000 | $4.42 | $4.420,00 |
MAX159BCPA Descripción general
An analog-to-digital converter (ADC) is a data-acquisition integrated circuit that converts real-world analog signals - such as temperature, pressure, or sensor outputs - into a digital code that a microcontroller or processor can interpret. Successive-approximation (SAR) ADCs like the MAX159 sample an input through a track/hold, then compare the held voltage against a binary-weighted internal DAC bit-by-bit until a 10-bit result is registered. SAR converters sit at one level of the hierarchy: ADC -> data converter -> signal-chain IC -> mixed-signal semiconductor. The MAX159 family targets low-power, low-channel-count systems where SPI/QSPI/MICROWIRE compatibility simplifies glue logic.
Key features include 2 single-ended analog input channels (AIN0, AIN1) multiplexed into the SAR core, an external clock or internal oscillator option, ±1 LSB (max) differential non-linearity (DNL) and ±1 LSB (max) integral non-linearity (INL) over the operating range, and a wake-up time of just 2.5 µs from power-down. The 8-pin PDIP package simplifies breadboard prototyping and field-serviceable designs, making the device popular in industrial control front ends and portable instrumentation.
The MAX159 uses a charge-redistribution DAC architecture for the SAR conversion and a quiet reference-input path; the supply-rejection topology lets the part operate directly from a noisy 3.3V or 5V rail without an external LDO for many applications. Two digital inputs (CS, SCLK) and one digital output (DOUT) constitute the serial port compatible with SPI, QSPI, and MICROWIRE masters at up to 2.5 MHz.
Typical applications include battery-powered handheld meters, portable data loggers, isolated sensor front ends, thermocouple cold-junction compensation boards, and touch-panel digitizers. Designers also use it as a 2-channel replacement for legacy microcontroller-integrated ADCs when more channels or better DC accuracy are required.
When designing with this device, place a 0.1 µF bypass capacitor within 5 mm of the VDD pin and keep the analog input traces short and guarded. The reference voltage (REF) needs to be a low-noise source; use a 10 µF ceramic plus 0.1 µF decoupling pair at REF.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para MAX159BCPA — 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 MAX159BCPA (mismo factor de forma y huella) — difiere en Package, Conversion Time, Input Type, Operating Temperature, Sampling Rate.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MAX159BCPA+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX157BCPA
✅ Sustitución directa✓ En stock
$3.1 / unidad
Ver hoja de datos →MAX159BEPA
✅ Sustitución directa✓ En stock
$4.1 / unidad
Ver hoja de datos →MAX1243ACPA
✅ Sustitución directa✓ En stock
$5.92 / unidad
Ver hoja de datos →MAX1242BCPA
✅ Sustitución directa✓ En stock
$7.55 / unidad
Ver hoja de datos →MAX1240BEPA+
✅ Sustitución directa✓ En stock
$5.55 / unidad
Ver hoja de datos →MAX159BCPA Valores máximos y características eléctricas
| Number of Bits | 10 |
| Frecuencia de muestreo | 108 ksps |
| Number of Input Channels | 2 (single-ended) |
| Input Type | Single-Ended (Pseudo-Differential on REF) |
| Supply Voltage (VDD) | +2.7 V to +5.25 V |
| Power Consumption | 3.2 mW at VDD = +3.6 V (108 ksps) |
| Integral Nonlinearity (INL) | ±1 LSB (max) |
| Differential Nonlinearity (DNL) | ±1 LSB (max) |
| Conversion Time | 7.4 µs (successive approximation) |
| Wake-Up Time from Power-Down | 2.5 µs |
| Serial Interface | 3-wire SPI/QSPI/MICROWIRE-compatible |
| Rango de temperatura de funcionamiento | 0 C to +70 C (commercial grade, suffix C) |
| Encapsulado | 8-pin PDIP (DIP-8, 0.300 inch) |
| Tipo de montaje | Through-Hole |
| Nivel MSL | 1 (not moisture-sensitive) |
Configuración de pines de MAX159BCPA
| Pin 1 | AIN0 — Analog Input Channel 0 (single-ended) |
| Pin 2 | AIN1 — Analog Input Channel 1 (single-ended) |
| Pin 3 | CS — Active-low Chip Select for serial interface |
| Pin 4 | GND — Ground (0 V) |
| Pin 5 | REF — External Reference Voltage input |
| Pin 6 | DOUT — Serial Data Output (SPI/MICROWIRE-compatible) |
| Pin 7 | SCLK — Serial Clock Input |
| Pin 8 | VDD — Positive Supply Input (+2.7 V to +5.25 V) |
Aplicaciones típicas
MAX159BCPA es adecuado para 6 aplicacións: Battery-Powered Handheld Meter, Portable Data Logger, Isolated Sensor Front End, Touch-Panel Digitizer Board, Industrial Process Control Front End, Slow Audio-Bandwidth Signal Acquisition.
Battery-Powered Handheld Meter
The MAX159BCPA's 3.2 mW power draw at VDD=+3.6V and 108 ksps, combined with automatic power-down between conversions and a 2.5 µs wake-up, make it ideal for AA- or Li-battery-powered DMMs and clamp meters. Two single-ended AIN0/AIN1 inputs multiplex voltage and current sense channels, while the SPI-compatible 3-wire interface lets an 8-bit MCU read result codes at low duty cycle without burdening the host. According to the MAX157/MAX159 datasheet, power-down current drops into the microampere range, extending battery life for field-portable instruments. Reference design patterns from the datasheet typical application circuit are reused as-is, requiring only 0.1 µF and 10 µF supply decoupling close to VDD. Estimated: at 1 sample/sec the average current falls below 100 µA, supporting multi-month operation on two AA cells.
Recomendado
Portable Data Logger
Portable data loggers for environmental monitoring demand multi-month battery life and small BOM size, both of which the MAX159BCPA delivers through its 108 ksps SAR core and integrated track/hold. The two single-ended channels simplify acquisition of either two slow analog sensors (e.g., temperature and humidity) or one ratiometric bridge plus a battery monitor. Designers wire DOUT/SCLK/CS directly to the host MCU's SPI peripheral and use CS as a chip-select to chain with an SPI flash. The 7.4 µs conversion time and ±1 LSB INL/DNL ensure 10-bit effective resolution is preserved across the supply range, while internal power-down keeps average dissipation negligible between samples. Estimated: 1 kHz FIFO-friendly conversion rate suits a 2-channel logger sampled once per second with negligible thermal load.
Recomendado
Isolated Sensor Front End
In isolated thermocouple, RTD, or 4-20 mA loop front ends, the MAX159BCPA's SPI-only digital interface simplifies optocoupler or digital-isolator partitioning because only three digital lines cross the isolation barrier. Its 10-bit resolution and 108 ksps rate comfortably digitize cold-junction compensation, pressure-bridge, and strain-gauge signals; ±1 LSB INL over 0 C to +70 C ensures stable calibration in industrial panels. Two single-ended channels support dual-sensor boards without an external analog mux, and the +2.7V to +5.25V supply range lets the part run from a post-isolated 5V regulator or a 3.3V digital rail. Reference: Maxim MAX157/MAX159 datasheet typical application circuit shows a single-supply ratiometric configuration with an external precision reference.
Recomendado
Touch-Panel Digitizer Board
Resistive touch-panel controllers digitize two analog voltage nodes representing X and Y touch positions; the MAX159BCPA's two single-ended channels (AIN0, AIN1) match this topology exactly, replacing the discrete ADC inside legacy MCUs. At 108 ksps it oversamples even moderate touch slew rates, and the 3-wire SPI bus connects directly to the host without any glue logic. The 8-pin PDIP package makes hand-rework and lab bring-up painless, and 0.1 µF/10 µF decoupling on VDD is sufficient to hold noise within 1 LSB. Estimated: at 50 Hz touch sampling, the average current is dominated by controller power, not ADC - keeping the BOM to roughly $1 per channel including reference.
Recomendado
Industrial Process Control Front End
For PLC analog-input modules, the MAX159BCPA provides two ratiometric input channels ideal for 0-10V or 4-20 mA loop digitization after a simple resistor-divider or shunt front end. The +2.7V to +5.25V supply range supports 5V PLC backplanes, while the MAX159BEPA variant extends the operating temperature range to -40 C to +85 C for field cabinets. ±1 LSB INL/DNL over temperature makes the part suitable for closed-loop control valves and motor-drive current sensing where 10-bit effective resolution is acceptable. Reference: Maxim MAX157/MAX159 datasheet Figure 4 detail shows how to wire AIN0/AIN1 for both single-ended and pseudo-differential operation using REF.
Recomendado
Slow Audio-Bandwidth Signal Acquisition
The MAX159BCPA's 108 ksps throughput supports digital acquisition of audio-bandwidth signals below the Nyquist limit (about 40 kHz), enabling simple digital audio scopes, vibration sensors, or speech-quality telemetry. Its two channels can capture left and right, or input plus pre-emphasis signal, while the SPI-compatible bus streams 10-bit two's-complement codes to a DSP or microcontroller. Anti-aliasing filtering at the AIN pins is required; the SAR front-end's 2.5 µs track/hold rejects signals above the bandwidth set by the external RC. Estimated: signal-to-noise plus distortion is sufficient for sub-20 kHz voice telemetry when driven from a low-noise op-amp and a clean +5V reference.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX159BCPA — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX159BCPA+ | MAX157BCPA | MAX159BEPA | MAX1243ACPA | MAX1240BEPA+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated (same) | Maxim Integrated (same) | Maxim Integrated (same) | Maxim Integrated (same) | Maxim Integrated (same) |
| Package | PDIP-8 | PDIP-8 (same) | PDIP-8 (same) | PDIP-8 (same) | PDIP-8 (same) | PDIP-8 (same) |
| Resolution | 10 bits | 10 bits | 10 bits | 10 bits | 12 bits | 12 bits |
| Sampling Rate | 108 ksps | 108 ksps | 108 ksps | 108 ksps | 73 ksps | 100 ksps |
| Number of Analog Input Channels | 2 (single-ended) | 2 | 1 | 2 | 1 | 1 |
| Supply Voltage Range | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.7 V to +5.25 V |
| Interface | 3-wire SPI/QSPI/MICROWIRE | 3-wire SPI | 3-wire SPI | 3-wire SPI | 3-wire SPI | 3-wire SPI |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C (industrial) | 0 C to +70 C | 0 C to +70 C |
Diferenciadores clave
- Dual-channel single-ended input multiplexer (frente a MAX157BCPA)
- Commercial 0 C to +70 C with industrial upgrade path (frente a MAX159BEPA)
- Higher 108 ksps throughput versus 12-bit drop-ins (frente a MAX1243ACPA)
- Legacy-friendly through-hole PDIP-8 footprint (frente a MAX1119EKA-T)
Notas de diseño
The MAX159BCPA draws 3.2 mW at VDD=+3.6V at 108 ksps and is designed for battery-powered applications; per the Maxim MAX157/MAX159 datasheet, automatic power-down after each conversion lowers the average current into the microampere range when polled. Place a 0.1 µF ceramic bypass capacitor within 5 mm of the VDD pin and a 10 µF tantalum or ceramic bulk capacitor on the same node to suppress regulator droop during sample-and-hold acquisition. Avoid routing digital clocks (SCLK) and high-current loads near VDD to keep ripple below 1 LSB. Estimated: at 1 sample/sec average, the total BOM dissipation including reference biasing falls below 1 mW, supporting AA-cell lifetimes measured in months.
Per the Maxim MAX157/MAX159 datasheet typical-application schematic, route AIN0 and AIN1 traces as guarded differential pairs referenced to REF, with REF decoupling composed of a 10 µF ceramic in parallel with a 0.1 µF ceramic. Keep analog traces short and avoid running digital signals parallel to AIN lines for more than a few millimeters. Place the GND pin on the same ground plane as the host MCU; a split analog/digital plane under the ADC pinout is recommended only when both grounds return to a single star point at the regulator.
Two common design pitfalls with the MAX159BCPA are: (1) supplying REF with a noisy source - the SAR reference path multiplies REF noise into the conversion, so use a low-noise LDO such as the MAX6066 or a buried-zener reference; (2) leaving CS floating during power-up can cause spurious SCLK pulses to corrupt DOUT - always tie CS to VDD through a 100 kohm pull-up when the host is not driving it. Additionally, the commercial-grade MAX159BCPA is rated only 0 C to +70 C; for industrial deployments, substitute the MAX159BEPA to avoid cold-start issues. Estimated reference settling: with a 0.1 µF/10 µF pair, REF ripple is below 1 LSB at the 7.4 µs conversion window.
Información de cumplimiento
Bare MAX159BCPA was released before the modern RoHS directive took effect; ordering the '+' part (MAX159BCPA+) is required for RoHS-compliant assemblies. The MAX159BCPA is not AEC-Q100 qualified; for automotive designs consult Maxim/ADI's automotive-grade ADC selection guides.
