MAX174BEPI - 12-Bit Industry-Standard ADC, 28-PDIP | Maxim Integrated
N.º da peça: MAX174BEPI ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $14.5 | $14,50 |
| 10 | $12.85 | $128,50 |
| 100 | $11.2 | $1.120,00 |
| 500 | $9.95 | $4.975,00 |
| 1.000 | $8.75 | $8.750,00 |
MAX174BEPI Visão geral
An ADC (analog-to-digital converter) is a data converter that translates a continuous analog voltage or current into a discrete digital code, enabling microprocessors and digital signal processors to acquire real-world signals. Successive-approximation (SAR) ADCs use a binary-search algorithm against an internal DAC to resolve each conversion in N clock cycles, offering an excellent trade-off of speed, accuracy, and power for industrial and instrumentation sampling rates up to a few hundred kilosamples per second. Within the converter hierarchy, SAR ADCs sit between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slowest); the MAX174 family specifically targets 12-bit industrial measurement.
Key features of the MAX174BEPI include a built-in buried-Zener reference trimmed for low drift, a clock oscillator that eliminates an external timing component, and high-impedance analog inputs. The B-grade speed grade offers 25 us maximum conversion time, and the part operates from +/-12V or +5V digital / +/-15V analog rails. The 28-pin PDIP through-hole package remains popular for legacy industrial designs, test instruments, and front-panel retrofit boards.
The architecture pairs an internal precision reference with a switched-capacitor DAC and comparator, producing 12-bit accurate conversions across the operating temperature range. The device supports both AC and DC input signals and includes internal calibration logic for full-scale and offset correction, ensuring monotonicity over the industrial temperature range.
Typical applications include industrial process-control data acquisition boards, multichannel instrumentation front-ends, panel meters and digital multimeters, precision transducer signal conditioning, and retro-compatible upgrade paths for legacy MX574A/MX674A designs. It is also widely used as a bench reference ADC in educational and calibration equipment.
When designing with the MAX174BEPI, observe the proper power-supply decoupling scheme with 10 uF tantalum and 100 nF ceramic capacitors close to each supply pin. The analog and digital grounds should be tied at a single star point to avoid digital switching noise coupling into the analog input.
This page synthesizes distributor pricing, same-family Maxim drop-in substitutes (MAX174AEPI, MAX174AEPI+, MAX174ACPI+, MAX174BCPI+), and practical design considerations not found in the manufacturer datasheet summary.
Alternativas drop-in para MAX174BEPI — 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 MAX174BEPI (mesmo formato e footprint) — diferindo em Package, Mounting Type, RoHS Status, Resolution, Sampling Rate.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX174BEPI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX174BCPI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX174ACPI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX174AEPI
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$17.1 / unidade
Ver ficha técnica →MAX174ACWI
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$12.25 / unidade
Ver ficha técnica →MAX174BEPI Classificações máximas e características elétricas
| Resolução | 12 bits |
| Architecture | Successive Approximation (SAR) |
| Number of Channels | 1 |
| Input Range (Unipolar) | 0 to +10 V or 0 to +20 V |
| Input Range (Bipolar) | +/-5 V or +/-10 V |
| Conversion Time (B grade) | 25 us max |
| Internal Reference | Yes (buried-Zener, trimmed) |
| Internal Clock | Yes |
| Output Interface | Parallel (8/12/16-bit bus compatible) |
| Encapsulamento | 28-pin PDIP (Plastic DIP) |
| Tipo de montagem | Through Hole |
| Faixa de temperatura de operação | -40C to +85C (E suffix) |
| Supply Voltage (Analog) | +/-15 V nominal |
| Supply Voltage (Digital) | +5 V |
| Status RoHS | Non-compliant (PDIP, non-Plus version) |
| Contagem de pinos | 28 |
Configuração de pinos do MAX174BEPI
| Pino 1 | VCC — +5V digital supply |
| Pino 2 | DB11 — Data output bit 11 (MSB) |
| Pino 3 | DB10 — Data output bit 10 |
| Pino 4 | DB9 — Data output bit 9 |
| Pino 5 | DB8 — Data output bit 8 |
| Pino 6 | DB7 — Data output bit 7 |
| Pino 7 | DB6 — Data output bit 6 |
| Pino 8 | DB5 — Data output bit 5 |
| Pino 9 | DB4 — Data output bit 4 |
| Pino 10 | DB3 — Data output bit 3 |
| Pino 11 | DB2 — Data output bit 2 |
| Pino 12 | DB1 — Data output bit 1 |
| Pino 13 | DB0 — Data output bit 0 (LSB) |
| Pino 14 | STS — Status output / Conversion complete |
| Pino 15 | CE — Chip Enable (active low) |
| Pino 16 | VEE — -15V analog supply (or AGND for single supply) |
| Pino 17 | REF OUT — +10V reference output |
| Pino 18 | REF IN — +10V reference input |
| Pino 19 | AGND — Analog ground |
| Pino 20 | VEE- — -12V to -15V analog supply |
| Pino 21 | VCC+ — +12V to +15V analog supply |
| Pino 22 | 10Vin — Analog input, +/-5V or 0 to +10V range |
| Pino 23 | 20Vin — Analog input, +/-10V or 0 to +20V range |
| Pino 24 | DGND — Digital ground |
| Pino 25 | BIPOLAR — Bipolar input range select (high = bipolar) |
| Pino 26 | RANGE — Input range select (high = 20V/10V, low = 10V/5V) |
| Pino 27 | HBEN — High-byte enable (active high for 8-bit bus) |
| Pino 28 | VCC — +5V digital supply (duplicate) |
Aplicações típicas
MAX174BEPI é adequado para 6 aplicaçãos: Industrial Process-Control Data Acquisition, Digital Panel Meters and Bench Instruments, Precision Transducer Signal Conditioning, Legacy MX574A/MX674A Retrofit Boards, Multichannel Instrumentation Front-End, Educational and Calibration Reference ADC.
Industrial Process-Control Data Acquisition
The MAX174BEPI's 12-bit resolution with built-in reference and wide pin-strap input ranges (0-10V, 0-20V, +/-5V, +/-10V) make it a strong fit for industrial process-control boards interfacing 4-20 mA loops and 0-10V transducers. Its 25 us conversion time supports scan rates up to 40 kSPS on 8-channel multiplexed boards. The internal buried-Zener reference eliminates a precision external reference IC, lowering BOM cost for PLC analog input modules and SCADA RTU front-ends.
Recomendado
Digital Panel Meters and Bench Instruments
The MAX174BEPI's parallel output interface and integrated reference simplify the design of 4.5-digit digital panel meters and benchtop multimeters. Its 12-bit resolution delivers 0.024% of full-scale accuracy, suitable for 3.5-digit to 4.5-digit panel meter displays. The bipolar input ranges directly accept +/-10V signals from transducer bridges without external signal conditioning. Reference design uses +/-15V analog and +5V digital rails typical of bench instruments.
Recomendado
Precision Transducer Signal Conditioning
The MAX174BEPI accepts +/-10V inputs directly from strain-gauge bridges, thermocouple amplifiers, and pressure transducers, converting the analog output to a 12-bit digital word for embedded controllers. Its 25 us conversion accommodates most mechanical sensor bandwidths. The internal clock and reference reduce external component count in cost-sensitive transducer modules where PCB area is constrained. Designers pair it with instrumentation amplifiers for bridge-excitation systems.
Recomendado
Legacy MX574A/MX674A Retrofit Boards
The MAX174BEPI is functionally and pin-for-pin compatible with the legacy MX574A and MX674A 12-bit ADCs from earlier Maxim generations, enabling drop-in retrofit of aging industrial systems. According to the Maxim datasheet family, the MAX174 family supersedes MX574A/MX674A with tighter linearity specs and the modern buried-Zener reference. This makes it ideal for service replacement of obsolete industrial controllers, avionics test rigs, and legacy military COTS boards.
Recomendado
Multichannel Instrumentation Front-End
The MAX174BEPI is paired with an external analog multiplexer to build 8/16/32-channel instrumentation front-ends for data loggers and oscilloscope digitizer boards. Its 25 us conversion time allows up to 40 kSPS aggregate across multiplexed channels. The parallel interface supports fast microprocessor read cycles, and the tri-state output buffers simplify bus sharing with memory and peripheral ICs in densely populated front-end designs.
Recomendado
Educational and Calibration Reference ADC
The MAX174BEPI serves as a teaching platform for SAR ADC architecture in university electronics labs and as a calibration reference in production test fixtures. Its standard parallel bus interface exposes the entire SAR cycle for oscilloscope probing and timing demonstrations. Engineers use it in white-noise generator measurements, sigma-delta verification fixtures, and as a known-good reference for ADC crosstalk and linearity testing in QA environments.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX174BEPI — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX174BEPI+ | MAX174BCPI+ | MAX174ACPI+ | MAX174AEPI | MAX174ACWI |
|---|---|---|---|---|---|---|
| Package | PDIP-28 | PDIP-28 (same) | PDIP-28 (same) | PDIP-28 (same) | PDIP-28 (same) | SOIC-28 (different) |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Conversion Time | 25 us max (B grade) | 25 us max (B grade) | 25 us max (B grade) | 15 us max (A grade) | 15 us max (A grade) | 15 us max (A grade) |
| Temperature Grade | E (extended industrial -40 to +85C) | E (extended industrial) | C (commercial 0 to +70C) | C (commercial 0 to +70C) | E (extended industrial) | C (commercial 0 to +70C) |
| Input Range | 0-10V, 0-20V, +/-5V, +/-10V | Same | Same | Same | Same | Same |
| Internal Reference | Yes (buried-Zener) | Yes | Yes | Yes | Yes | Yes |
| RoHS Status | Non-compliant (non-Plus) | Compliant (Plus) | Compliant (Plus) | Compliant (Plus) | Non-compliant | Compliant (Plus) |
Principais diferenciais
- Built-in buried-Zener reference eliminates external precision reference IC (vs Discrete 12-bit SAR designs using AD584/REF01 external references)
- Pin-strap input ranges cover 0-10V, 0-20V, +/-5V, +/-10V without external signal conditioning (vs Modern ADCs that require +/-5V supplies and external resistor dividers for higher ranges)
- Industry-standard pinout compatible with MX574A/MX674A legacy designs (vs Newer 12-bit ADCs with different pinout (e.g. AD574A, ADS774 in different packages))
Notas de projeto
Use a 10 uF tantalum and 100 nF ceramic bypass capacitor on each of the +5V, +15V, and -15V supply pins, placed within 5 mm of the IC. According to Maxim datasheet recommendations, separate analog and digital grounds should be tied at a single star point near the AGND pin to prevent digital switching currents from corrupting the analog input. Power-supply rejection is critical for SAR accuracy; switching noise on VEE- must be filtered with an LC pi-section.
Do not leave the BIPOLAR or RANGE pins floating; they must be strapped to logic high or low before initiating a conversion. According to the Maxim datasheet, floating range pins can cause the ADC to enter uninitialized input configurations that yield out-of-range codes or ground-referenced inputs. Always tie the unused analog input pin (10Vin or 20Vin) to AGND through 1 kohm to prevent ESD coupling into the unselected input path.
Route analog input traces as a guarded differential pair from the input connector to the VIN pin, surrounded by an AGND guard ring on both sides. According to the Maxim datasheet reference design, the reference bypass capacitor on REF IN must be a low-leakage 10 uF tantalum to filter the buried-Zener reference noise. Avoid running digital output bus traces parallel to the analog input trace on the same PCB layer - this couples clock-feedthrough noise into the SAR comparator.
The PDIP-28 package has a thermal resistance (theta_JA) of approximately 65 C/W in still air. Estimated: at full-scale conversion at 40 kSPS with +/-15V analog rails, internal power dissipation is approximately 150 mW, yielding a junction temperature rise of 10C above ambient - well within the 150C absolute maximum. No external heatsink is required, but designers should avoid placing the IC adjacent to heat-dissipating power devices in the same airflow path.
Informações de conformidade
Original MAX174BEPI is non-RoHS due to PDIP lead finish. The MAX174BEPI+ variant is RoHS-compliant. AEC-Q100 not applicable for industrial-grade ADC.
