MAX174BCPI - 12-Bit 8µs SAR ADC with Reference | Maxim Integrated | PDIP-28
N.º de pieza: MAX174BCPI ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $28.5 | $28,50 |
| 10 | $24.95 | $249,50 |
| 100 | $19.4 | $1.940,00 |
| 500 | $16.75 | $8.375,00 |
| 1.000 | $14.2 | $14.200,00 |
MAX174BCPI Descripción general
A SAR ADC is a successive-approximation-register analog-to-digital converter, which is a subtype of ADC that uses a binary-search algorithm against an internal DAC to digitize an analog input in N clock cycles for N bits of resolution. SAR ADCs occupy the middle ground in the ADC taxonomy: they offer higher speed than integrating or delta-sigma converters but lower speed than flash ADCs, while delivering excellent DC accuracy, low latency, and low power consumption without the switching noise inherent to delta-sigma architectures. The MAX174 belongs to the broader category of data-acquisition ICs, which sit within signal-chain components and ultimately within the power-management-and-analog IC family of semiconductors.
Key features include 12-bit resolution with no missing codes, ±0.5 LSB maximum integral nonlinearity (INL), and a track/hold amplifier capable of digitizing signals up to its Nyquist bandwidth. The device operates from ±12V or ±15V supplies, drawing typically 80 mW, with a power-down mode that reduces consumption to under 5 mW between conversions. The 8µs conversion time translates to a 125 kHz throughput, suitable for high-speed industrial control loops and multi-channel multiplexing systems.
The internal architecture uses a capacitive-charge-redistribution DAC for the SAR loop, a precision buried-zener reference laser-trimmed for low drift, and a self-biasing bipolar front end that accepts true bipolar input signals without external signal conditioning. The device includes control logic that allows direct connection to microprocessors via the 12-bit parallel bus, with standard CS, RD, and BUSY handshake signals compatible with 8080-family processor interfaces.
Typical applications include industrial process-control data acquisition, digital panel meters, instrumentation amplifiers digitizing strain-gauge signals, multi-channel data-logging multiplexed systems, and benchtop test-and-measurement equipment. The wide bipolar input range makes it particularly attractive in legacy 12-bit data-acquisition boards where direct connection to ±10V transducer outputs is required without external resistor attenuators or level-shift circuits.
When designing with this device, ensure the power-supply bypass network uses 10 µF tantalum in parallel with 0.1 µF ceramic at each supply pin; failure to provide adequate decoupling degrades the reference noise and INL. The analog input must be protected with an external op-amp buffer or low-impedance driving source to avoid kick-back from the internal capacitive DAC, which would otherwise introduce settling errors at the rated 8 µs conversion speed.
This page synthesizes distributor pricing, drop-in alternatives, application guidance, and design notes not aggregated on the manufacturer datasheet, providing an engineer-ready summary for sourcing and design-in decisions.
Alternativas directas para MAX174BCPI — 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 MAX174BCPI (mismo factor de forma y huella) — difiere en RoHS Status, Mounting Type, Architecture, Data Interface, Operating Temperature Range.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MAX174BEPI+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX174BCPI+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX174AEPI
✅ Sustitución directa✓ En stock
$17.1 / unidad
Ver hoja de datos →MAX674ACPI
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD574AJNZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX174BCPI Valores máximos y características eléctricas
| Resolución | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 |
| Maximum Conversion Time | 8 µs |
| Integral Non-Linearity (INL) | ±0.5 LSB (max) |
| Analog Input Range | ±5V, ±10V, 0-10V, 0-15V (unipolar or bipolar, jumper-selectable) |
| Tensión de alimentación | ±12V or ±15V dual supply |
| Power Consumption (active) | 80 mW (typical) |
| Internal Reference | 10V buried-zener, laser-trimmed |
| Internal Clock | Yes |
| Digital Interface | 12-bit parallel, microprocessor-compatible |
| Encapsulado | 28-pin PDIP (N-28) |
| Rango de temperatura de funcionamiento | 0°C to +70°C (commercial grade, 'C' suffix) |
| Tipo de montaje | Through-Hole (PDIP) |
| Estado RoHS | Non-Compliant (PDIP with SnPb finish) |
Configuración de pines de MAX174BCPI
| Pin 1 | VSS (-15V) — Negative analog supply (-12V to -15V) |
| Pin 2 | VLOGIC (+5V) — Logic supply (+5V) for digital interface |
| Pin 3 | /CS — Chip select (active low) |
| Pin 4 | /RD — Read input (active low) |
| Pin 5 | /BUSY — Busy/status output (active low during conversion) |
| Pin 6 | 1.2V — Reference-decoupling node, bypass with 0.1µF capacitor |
| Pin 7 | GND — Analog ground |
| Pin 8 | REF OUT — +10V reference output (internal buried-zener) |
| Pin 9 | REF ADJ — Reference-trim input (use 100kΩ pot for fine trim) |
| Pin 10 | REF IN — Reference voltage input (normally tied to REF OUT) |
| Pin 11 | BIP OFF — Bipolar offset (jumper-selectable for ±10V, ±5V, 0-10V, 0-15V modes) |
| Pin 12 | 10VIN/AIN — Analog input (full-scale set by input-range jumper) |
| Pin 13 | AGND — Analog ground return for input signal |
| Pin 14 | SENSE — Analog-range-select jumper terminal |
| Pin 15 | DB11 (MSB) — Parallel data bit 11 (MSB) |
| Pin 16 | DB10 — Parallel data bit 10 |
| Pin 17 | DB9 — Parallel data bit 9 |
| Pin 18 | DB8 — Parallel data bit 8 |
| Pin 19 | DB7 — Parallel data bit 7 |
| Pin 20 | DB6 — Parallel data bit 6 |
| Pin 21 | DB5 — Parallel data bit 5 |
| Pin 22 | DB4 — Parallel data bit 4 |
| Pin 23 | DB3 — Parallel data bit 3 |
| Pin 24 | DB2 — Parallel data bit 2 |
| Pin 25 | DB1 — Parallel data bit 1 |
| Pin 26 | DB0 (LSB) — Parallel data bit 0 (LSB) |
| Pin 27 | DGND — Digital ground |
| Pin 28 | VDD (+15V) — Positive analog supply (+12V to +15V) |
Aplicaciones típicas
MAX174BCPI es adecuado para 6 aplicacións: Industrial Process-Control Data Acquisition, Digital Panel Meters and Bench Instruments, Strain-Gauge and Bridge Sensor Digitization, Multiplexed Data-Logging Systems, Legacy Test and Measurement Equipment, Audio Signal Analysis and RF Power Metering.
Industrial Process-Control Data Acquisition
The MAX174BCPI suits 12-bit industrial data-acquisition boards because its bipolar ±10V and 0-15V input ranges directly accept the output of 4-20 mA current-loop receivers and strain-gauge bridges without external signal conditioning. Its integrated 10V buried-zener reference and 8µs conversion deliver a complete 125 kSPS SAR signal chain in one IC, reducing BOM cost versus multi-chip ADC designs. Operated on ±15V supplies, the device handles the ±10V common-mode range found in factory-floor analog I/O modules. The 28-pin PDIP form factor remains popular in legacy PLC analog input cards where through-hole replacement simplifies service and firmware qualification. A typical circuit uses an AD620 instrumentation amp upstream, the MAX174 on the ADC slot, and a 74HC573 latch for bus sharing with the host microcontroller.
Recomendado
Digital Panel Meters and Bench Instruments
The MAX174BCPI delivers the resolution, bipolar input range, and integrated reference required by 4½-digit digital panel meters (DPMs) and bench instruments. Its 12-bit resolution with no missing codes offers >99.97% theoretical DNL, which translates to stable readings without flicker at the lowest digit, and the on-chip 10V reference allows direct calibration against external standards. The 8µs conversion rate supports update rates above 10 Hz typical for DPM readouts, while the 12-bit parallel interface is easily read by 8051, PIC, and PIC32 microcontrollers. The ±15V supply connects directly to the analog front end of typical bench instruments, eliminating the boost-stage typically required for ±15V rail generation. The 28-pin PDIP is well-suited to mains-powered bench instruments that use through-hole components for serviceability.
Recomendado
Strain-Gauge and Bridge Sensor Digitization
Bridge-transducer signal chains digitize microvolt-level outputs from load cells, pressure sensors, and strain gauges, and the MAX174BCPI's 12-bit resolution with a bipolar ±10V input range accommodates ratiometric excitation at 10V and full-scale outputs of up to ±30 mV after INA128 amplification. The internal 10V reference can be re-routed to drive the bridge excitation, eliminating the need for an external ratiometric reference and saving roughly $1 in BOM cost. The 8µs conversion enables oversampling and averaging with simple first-order FIR filters without missing real-time events. The parallel digital interface supports direct connection to FPGAs implementing digital filters that further improve effective resolution. The standard 28-pin PDIP package simplifies hand prototyping of load-cell and pressure-sensor instrumentation for OEM test fixtures.
Recomendado
Multiplexed Data-Logging Systems
Multi-channel data-logging designs pair the MAX174BCPI with an 8 or 16-channel analog multiplexer (CD4051, ADG608) to scan thermocouples, RTDs, and process currents at aggregate throughputs above 100 kSPS. The MAX174's 8µs conversion time provides ample settling margin for 8-channel scanning at typical 100 Hz per channel update rates, and its 12-bit resolution with no missing codes avoids channel-to-channel noise-spike errors. The internal clock eliminates the need for an external timing source, simplifying the BOM, while the digital /CS /RD /BUSY handshake remains compatible with simple 8051 or PIC16F I/O bit-banging. The 28-pin PDIP through-hole package suits industrial data loggers using legacy through-hole manufacturing. Designers often use two MAX174BCPI chips in parallel on the same bus for higher channel count where budget constraints preclude more-expensive 16-bit SAR ADCs.
Recomendado
Legacy Test and Measurement Equipment
The MAX174BCPI remains a staple in legacy ATE and bench-test designs because its 12-bit resolution and 8µs conversion form the building block of many 1980s- and 1990s-era data-acquisition cards still in service today. The bipolar ±10V input accepts most transducer outputs and audio test points directly, and its 12-bit parallel interface is straightforward to integrate into legacy VMEbus, ISA-bus, and GPIB-instrument architectures. The integrated 10V reference supports the 5-10V signal ranges typical of legacy ATE, while the +5V logic interface ensures compatibility with bipolar logic families (74LS, 74HC) still common in test instrumentation. Service and repair of legacy equipment is supported by the through-hole PDIP package and the long-term availability of the MAX174 family on the distributor secondary market.
Recomendado
Audio Signal Analysis and RF Power Metering
Audio-frequency analyzer and RF-power-meter front ends require signal-to-noise ratios that the MAX174BCPI's 12-bit dynamic range and integrated low-noise reference easily meet. With a unipolar 0-10V input range, the MAX174 can digitize buffered microphone preamp outputs or RF-detector voltages directly, and its 8µs conversion rate captures audio-bandwidth signals up to its Nyquist frequency. The internal 10V reference sets the full-scale calibration point precisely, and the parallel interface integrates with audio DSPs and microcontroller-based metering displays. The MAX174BCPI is often paired with a log detector (AD8307) or RMS-to-DC converter (AD736) for RF-power meters, where the ADC's bipolar ±10V input handles the wide dynamic range of detector outputs. The 28-pin PDIP is well-suited to audio- and RF-analog front-end boards that prefer through-hole parts for serviceability.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX174BCPI — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX174BEPI+ | MAX174BCPI+ | MAX174AEPI | MAX674ACPI | AD574AJNZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | PDIP-28 | PDIP-28 (same) | PDIP-28 (same) | PDIP-28 (same) | PDIP-28 (same) | PDIP-28 (same) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Conversion Time | 8 µs | 8 µs | 8 µs | 8 µs | 15 µs | 25 µs |
| Input Range | ±5/±10/0-10/0-15V bipolar | ±5/±10/0-10/0-15V | ±5/±10/0-10/0-15V | ±5/±10/0-10/0-15V | ±5/±10/0-10/0-15V | ±5/±10/0-10/0-15V |
| INL (max) | ±0.5 LSB | ±0.5 LSB (trim options) | ±0.5 LSB | ±0.5 LSB | ±0.5 LSB | ±1 LSB |
| Internal Reference | 10V buried-zener | 10V | 10V | 10V | 10V | 10V |
| Power Consumption | 80 mW (typical) | 80 mW | 80 mW | 80 mW | 115 mW | 120 mW |
| RoHS Compliance | Non-compliant (SnPb) | RoHS compliant | RoHS compliant | Non-compliant (SnPb) | Non-compliant (SnPb) | RoHS compliant |
| Lifecycle Status | Obsolete (no longer manufactured) | Limited / Last time buy | Obsolete | Limited | Obsolete | Active |
Diferenciadores clave
- Faster 8µs conversion in the same PDIP-28 family (frente a MAX674ACPI)
- Industrial ±15V bipolar operation in legacy through-hole form (frente a MAX176ACPA+)
- Complete ADC with integrated 10V reference and clock (frente a AD574AJNZ)
Notas de diseño
Estimated: at ±15V dual supplies the MAX174BCPI draws approximately 80 mW quiescent (3 mA from each rail), which means each ±15V pin requires a local 10 µF tantalum + 0.1 µF ceramic bypass network for clean reference voltage. Failure to provide adequate decoupling introduces 5-10 mV of reference noise that will visibly degrade INL. Designers should also decouple the +5V logic supply at pin 2 with a separate 0.1 µF ceramic capacitor to prevent digital switching noise from coupling into the analog reference. A common-mode choke between analog and digital supplies further reduces noise injection by 6-10 dB in industrial environments.
The MAX174BCPI's analog ground (pin 7, 13) and digital ground (pin 27) MUST join at a single star-point ground located directly under the IC, with the analog ground return path undisturbed by digital return currents. This single-point grounding scheme is the manufacturer's recommended pattern; splitting grounds elsewhere causes ground-loop errors of 1-3 LSB and produces 'noisy bottom bits' visible in the parallel data output. The analog input pin (pin 12) should be guarded on both sides of the PCB with low-impedance ground traces to minimize leakage and capacitive pickup of nearby digital signals.
The MAX174BCPI's input sample-and-hold has a 50-100 pF equivalent input capacitance at the start of each conversion, causing 'kick-back' current transients to the driving op-amp. Source impedance above 1 kΩ requires a wideband op-amp buffer (such as the AD845) with adequate slew rate (40 V/µs+) to settle within 1 µs after sampling. Lower-speed op-amps (e.g., OP07) introduce 2-3 LSB settling errors at the rated 8 µs conversion time. For applications sampling dynamic signals, place a 1 nF NP0 capacitor close to pin 12 to provide instantaneous charge for the sample-and-hold and reduce kick-back by 50%.
Do not exceed the supply sequence: apply analog supplies (±15V) BEFORE the +5V logic supply. Reversing this sequence can latch the device into a state where the parallel outputs drive the bus, potentially damaging host microcontroller I/O pins. When entering power-down (CS high, RD high), allow at least 5 µs for full output high-impedance release before driving the bus from another source. Finally, the /BUSY signal is open-collector in some revisions and push-pull in others; consult your specific datasheet revision before sizing the pull-up resistor at the MCU input.
Información de cumplimiento
MAX174BCPI uses tin-lead (SnPb) finish and is non-RoHS. The MAX174BCPI+ variant is RoHS-compliant with matte-tin finish. AEC-Q100 not applicable (consumer/industrial part, 0-70°C). REACH compliance inferred from distributor declaration.
