MAX176ACPA - 12-Bit 250ksps Serial ADC, 8-PDIP | Maxim
N.º da peça: MAX176ACPA ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $30.97 | $30,97 |
| 10 | $27.5 | $275,00 |
| 100 | $22.4 | $2.240,00 |
| 500 | $19.85 | $9.925,00 |
| 1.000 | $17.2 | $17.200,00 |
MAX176ACPA Visão geral
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples continuous analog signals and converts them into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Within the broader taxonomy, the MAX176ACPA belongs to SAR (Successive Approximation Register) ADCs -> data converters -> signal chain ICs -> mixed-signal semiconductors. SAR ADCs are favored over delta-sigma and pipeline architectures when low latency and deterministic throughput are required, particularly in multiplexed multi-channel systems and servo-loop control applications.
Key differentiating features include the 250 ksps guaranteed throughput, 12-bit resolution with no missing codes, an internal buried-zener reference providing low drift and low noise, single +5 V analog supply operation with a -5 V or larger negative reference option for bipolar input ranges, and a 3-wire (SPI/QSPI/MICROWIRE-compatible) serial interface that reduces pin count versus parallel-output ADCs of equivalent speed.
Architecture-wise, the MAX176ACPA uses a charge-redistribution switched-capacitor DAC inside the SAR loop. Track-and-hold is implemented as an open-loop input stage that settles to 12-bit accuracy in 0.4 us minimum. The buried-zener reference is factory-trimmed, eliminating the need for external reference components and shrinking the BOM versus ADCs that require external 2.5 V or 5 V references.
Typical applications span data acquisition systems, process control front-ends, portable instrumentation, weigh scales, and digital signal processing front-ends where a compact, low-pin-count ADC with internal reference is required. The 8-pin PDIP form factor also supports through-hole prototyping on breadboards and legacy industrial backplanes.
Designers should pay attention to input-signal conditioning: the MAX176ACPA accepts a unipolar 0 to +5 V input (with bipolar operation possible using the VEE pin and external driver). Source impedance should be kept below a few hundred ohms to avoid conversion-time errors. Decouple AVDD with a 10 uF tantalum in parallel with a 0.1 uF ceramic placed close to the pin.
This page synthesizes current distributor pricing, factory-package drop-in alternatives including the MAX176BCPA and MAX176AMJA, application guidance, and design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para MAX176ACPA — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MAX176ACPA (mesmo formato e footprint) — diferindo em Package, Sampling Rate, RoHS Status, Mounting Type, Conversion Time.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX176ACPA+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX176BCPA+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX176AMJA
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX176BMJA
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX176AEPA
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$20.2 / unidade
Ver ficha técnica →MAX176ACPA Classificações máximas e características elétricas
| Resolução | 12 bit |
| Taxa de amostragem | 250 ksps |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 |
| Input Type | Single-Ended (unipolar) |
| Supply Voltage (Analog) | +5 V |
| Supply Voltage (Negative) | -5 V or larger negative (for bipolar input range) |
| Interface | Serial, SPI/QSPI/MICROWIRE-compatible |
| Track/Hold Acquisition Time | 0.4 us maximum |
| Conversion Time | 3.5 us |
| Reference Type | Internal buried-zener |
| Encapsulamento | PDIP-8 (through-hole) |
| Faixa de temperatura de operação | 0C to +70C (commercial grade) |
| Contagem de pinos | 8 |
| Tipo de montagem | Through-Hole |
| Status RoHS | MAX176ACPA+ is RoHS compliant; MAX176ACPA (no +) is non-compliant |
Configuração de pinos do MAX176ACPA
| Pino 1 | CS — Chip Select - active low, enables serial interface |
| Pino 2 | DOUT — Serial Data Output - serialized conversion result, MSB first |
| Pino 3 | SCLK — Serial Clock Input - up to 5 MHz, SPI/QSPI/MICROWIRE compatible |
| Pino 4 | AGND — Analog Ground |
| Pino 5 | VEE — Negative supply input; tie to AGND for unipolar operation |
| Pino 6 | AIN — Analog Input, single-ended, 0 to +5 V unipolar or bipolar with VEE bias |
| Pino 7 | VDD — +5 V analog supply input |
| Pino 8 | REFIN/REFOUT — Internal reference output (4.096 V typ) / external reference input |
Aplicações típicas
MAX176ACPA é adequado para 6 aplicaçãos: Data Acquisition Systems, Process Control Instrumentation, Portable Instrumentation and Weigh Scales, DSP and Microcontroller Serial Interfaces, Closed-Loop Servo Control Systems, Industrial Sensor Front-Ends and Test Equipment.
Data Acquisition Systems
The MAX176ACPA's 12-bit resolution at 250 ksps throughput with an internal buried-zener reference makes it well suited for multichannel industrial data acquisition front-ends. Its SAR architecture provides no-latency conversions, allowing the host microcontroller or DSP to issue a conversion on each channel and retrieve the result in deterministic timing - critical for multiplexed systems where deterministic channel-to-channel settling is required.
Recomendado
Process Control Instrumentation
In process control front-ends, the MAX176ACPA accepts a 0 to +5 V or +/-5 V input from transducers such as load cells, pressure sensors, and 4 to 20 mA loop receivers. The 250 ksps sampling rate captures transient process dynamics well above the bandwidth needed for PID feedback, while the 12-bit resolution yields 1.22 mV LSB at full-scale ranges - sufficient for direct thermocouple cold-junction compensation and bridge sensor readouts without external gain stages.
Recomendado
Portable Instrumentation and Weigh Scales
The MAX176ACPA's 8-PDIP through-hole package and internal reference minimize external components - critical for hand-held battery-powered weight scales, panel meters, and bench instruments. The 5 V single-supply rail aligns with common 4-cell battery-powered designs, while the internal reference eliminates one power-hungry external reference chip. SAR 12-bit throughput at 250 ksps gives 10 ms acquisition time at the maximum sampling rate - more than adequate for weigh-scale settling.
Recomendado
DSP and Microcontroller Serial Interfaces
The MAX176ACPA's 3-wire serial interface is compatible with SPI, QSPI, and MICROWIRE interfaces found on DSPs and microcontrollers including the TI TMS320 family and 8051-based MCUs. By presenting the conversion result on a single DOUT line each conversion cycle, the MAX176ACPA reduces bus wiring and pin count compared to parallel-output ADCs of equivalent speed, leaving more host pins for digital I/O. This is valuable in serial-RF modules, motor-control MCUs, and instrumentation DSPs.
Recomendado
Closed-Loop Servo Control Systems
Digital servo loops for motor position and motion control require deterministic ADC latency so that each feedback sample maps to a known time stamp. The MAX176ACPA's SAR architecture delivers exactly one conversion result per start pulse with no pipeline delay, ideal for position, velocity, and torque feedback loops in stepper and DC servo controllers. Combined with its 3-wire serial link to the host MCU, the part fits naturally on the controller board alongside gate drivers and current-sense amplifiers.
Recomendado
Industrial Sensor Front-Ends and Test Equipment
The MAX176ACPA is widely used in industrial sensor front-ends and bench test equipment where a compact 8-PDIP 12-bit ADC with internal reference is needed. A typical test fixture uses the part to digitize a conditioned analog signal from a strain gauge, RTD, or current shunt, sending serial data to an embedded controller. The MAX176ACPA's 250 ksps throughput is also sufficient for vibration and acoustic sensors in industrial condition-monitoring applications where bandwidths of 50-80 kHz are captured.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX176ACPA — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX176ACPA+ | MAX176BCPA+ | MAX176AMJA | MAX176BMJA | MAX176AEPA |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | PDIP-8 | PDIP-8 (same) | PDIP-8 (same) | CERDIP-8 (8-pin, same pin count) | CERDIP-8 (8-pin, same pin count) | PDIP-8 (same) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 250 ksps | 250 ksps | 250 ksps | 250 ksps | 250 ksps | 250 ksps |
| Linearity Grade | A-grade (tighter INL) | A-grade | B-grade | A-grade | B-grade | A-grade |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) | -55C to +125C (military) | -55C to +125C (military) | -40C to +85C (industrial) |
| Reference | Internal buried-zener | Internal buried-zener | Internal buried-zener | Internal buried-zener | Internal buried-zener | Internal buried-zener |
| Interface | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE |
| RoHS Status | MAX176ACPA (non-compliant) / MAX176ACPA+ (compliant) | RoHS compliant (+) | RoHS compliant (+) | RoHS status varies by lot | RoHS status varies by lot | RoHS compliant (+) |
Principais diferenciais
- Internal buried-zener reference eliminates external reference IC (vs MAX176BCPA+)
- A-grade linearity (tighter INL) (vs MAX176BCPA+)
- SAR architecture = deterministic low-latency conversion (vs MAX176BMJA)
Notas de projeto
The MAX176ACPA requires a clean +5 V analog supply rail. Decouple VDD (pin 7) with a 10 uF tantalum capacitor in parallel with a 0.1 uF ceramic placed within 5 mm of the pin. For unipolar operation VEE (pin 5) should be tied to AGND; for bipolar inputs supply VEE with a -5 V or larger negative rail with its own decoupling network. Use a ground-plane PCB so that the AGND pin return current does not share a path with digital return currents from SCLK and DOUT traces.
Keep the analog input source impedance low (below ~1 kOhm). Source impedances higher than 5 kOhm cause conversion-time errors because the internal track/hold cannot fully settle within the 0.4 us acquisition window. When interfacing with high-impedance sensors (e.g. optical detectors, glass electrodes), buffer the input with a low-offset low-leakage op-amp such as the MAX4166 or LMC662 before the AIN pin.
Place the decoupling capacitors as close to VDD and VEE as physically possible, with short direct vias to ground. Route DOUT and SCLK traces away from the AIN trace and any analog front-end traces to avoid coupling clock noise into the analog signal path. Keep the analog (AIN, REFIN/REFOUT) and digital (CS, SCLK, DOUT) sections separated on different board planes when possible, with a single bridge at the AGND pin.
The MAX176ACPA's serial interface transitions in tens of nanoseconds, so terminate SCLK at the source if the host controller is more than 50 mm away. Place a small series resistor (33-100 ohm) at SCLK if ringing is observed on the clock trace. The DOUT line is push-pull CMOS - when driving multiple devices or long cables, add a 1 kOhm pull-up and use a twisted-pair or shielded cable instead of running DOUT next to noisy power lines.
Informações de conformidade
MAX176ACPA (no + suffix) is the original non-RoHS variant. MAX176ACPA+ is the RoHS-compliant drop-in variant. AEC-Q100 is not applicable because this part is designed for industrial/commercial instrumentation, not automotive-qualified applications.
