MAX150AEWP+ - 8-Bit 1.3µs Half-Flash ADC w/ Reference | Maxim
N.º da peça: MAX150AEWP+ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.42 | $8,42 |
| 10 | $7.58 | $75,80 |
| 100 | $6.74 | $674,00 |
| 500 | $5.91 | $2.955,00 |
| 1.000 | $5.07 | $5.070,00 |
MAX150AEWP+ Visão geral
An 8-bit ADC (analog-to-digital converter) is a mixed-signal integrated circuit that quantizes an analog input voltage into one of 256 discrete digital codes. Half-flash (or two-step flash) ADCs use two parallel 4-bit flash stages and a digital error-correction DAC to halve the comparator count of a true flash ADC while preserving sub-microsecond conversion speeds - a classic speed/cost trade-off used by Maxim's MAX150/MX7820 family and similar parts from competitors. ADCs sit in the signal chain hierarchy: analog front end -> ADC -> digital processor/microcontroller, and are essential whenever a sensor, transducer, or audio/video signal must be digitized for embedded processing.
Differentiating specifications include the integrated track-and-hold amplifier that eliminates the need for an external SHA, a built-in 2.5 V bandgap reference (stable enough for 8-bit accuracy without external buffering), and a ratiometric input range that can accept 0V to +5V unipolar signals when using the internal reference. The device provides a latching three-state output bus that interfaces directly to 8080/6800-style microprocessor buses without glue logic, simplifying microcontroller-based data-acquisition designs.
The MAX150/MX7820 architecture combines two 4-bit flash converter arrays with a 4-bit DAC for residue generation, then performs a second 4-bit flash conversion to assemble the final 8-bit code in two clock cycles. The on-chip track/hold uses a charge-compensation technique rather than a traditional SHA capacitor, which gives the part its wide input bandwidth despite the moderate sampling rate. The internal reference is a buried Zener bandgap trimmed at wafer level, providing ±1 LSB typical initial accuracy at 25 °C.
Typical applications include digital panel meters, portable instrumentation, waveform digitizers in oscilloscope front ends, audio spectrum analyzer front ends, process-control analog input modules, and any embedded system needing fast 8-bit acquisition with minimal external components. Designers choose this part when they need 8-bit resolution at higher throughput than successive-approximation ADCs but do not need 10/12/14-bit precision.
A key design tip: the input pin presents a relatively low source-impedance requirement because the internal track/hold is not a traditional switched-capacitor SHA. Add a 100 Ω series resistor plus a 100 pF capacitor on AIN to limit transient kickback when switching the input mux - this is standard Maxim app-note guidance. The digital outputs swing full TTL levels and can drive a few LS-TTL loads directly.
This page consolidates distributor stock data, half-flash architecture context, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet's typical-application schematic to help engineers select and implement the MAX150AEWP+ with confidence.
Alternativas drop-in para MAX150AEWP+ — 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 MAX150AEWP+ (mesmo formato e footprint) — diferindo em Mounting Type, Resolution, Architecture, Conversion Time, Operating Temperature Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX150AEWP+T
✅ Drop-In✓ Em estoque
$5.78 / unidade
Ver ficha técnica →MX7820KCWP+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MX7820KEWP+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX150AEWP+ Classificações máximas e características elétricas
| Manufacturer | Maxim Integrated (Analog Devices) |
| Part Number | MAX150AEWP+ |
| Função | 8-Bit Analog-to-Digital Converter (ADC) |
| Architecture | Half-Flash (Two-Step Flash) |
| Resolução | 8 bits (256 codes) |
| Conversion Time | 1.34 µs (typical) |
| Analog Supply Voltage | +5 V (single supply) |
| Digital Supply Voltage | +5 V (single supply, TTL-compatible I/O) |
| On-Chip Reference | +2.5 V bandgap |
| Track/Hold Amplifier | Internal, integrated |
| Number of Channels | 1 single-ended input |
| Faixa de tensão de entrada | 0 V to +5 V (unipolar, with internal reference) |
| Digital Output Interface | Three-state latching bus, 8080/6800 µP-compatible |
| Faixa de temperatura de operação | 0 °C to +70 °C (commercial, EWP suffix) |
| Encapsulamento | 20-pin SO (SOIC-20), gull-wing |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant (+ suffix indicates RoHS-compliant) |
| Lead-Free | Yes |
| Screening Level | Commercial |
Configuração de pinos do MAX150AEWP+
| Pino 1 | AIN — Analog input |
| Pino 2 | GND — Analog ground |
| Pino 3 | VREF — Internal +2.5 V reference output / reference input |
| Pino 4 | VDD — +5 V analog supply |
| Pino 5 | VSS — Digital ground |
| Pino 6 | DB0 — Data bit 0 (LSB), three-state |
| Pino 7 | DB1 — Data bit 1, three-state |
| Pino 8 | DB2 — Data bit 2, three-state |
| Pino 9 | DB3 — Data bit 3, three-state |
| Pino 10 | DB4 — Data bit 4, three-state |
| Pino 11 | DB5 — Data bit 5, three-state |
| Pino 12 | DB6 — Data bit 6, three-state |
| Pino 13 | DB7 — Data bit 7 (MSB), three-state |
| Pino 14 | VSS — Digital ground |
| Pino 15 | WR/RD — Write/Read control input |
| Pino 16 | CS — Chip select (active low) |
| Pino 17 | MODE — Mode select / conversion start |
| Pino 18 | INT/OUT — End-of-conversion / data ready signal |
| Pino 19 | VDD — +5 V digital supply |
| Pino 20 | NC — Not connected (per datasheet) |
Aplicações típicas
MAX150AEWP+ é adequado para 6 aplicaçãos: Digital Panel Meters and Process Indicators, Portable Test and Measurement Instrumentation, Audio Bandwidth Digitizing for Spectrum Analyzers, Embedded Microcontroller Data Acquisition Systems, Industrial Process Control Analog Input Modules, Legacy Computer and Peripheral Board Replacement.
Digital Panel Meters and Process Indicators
The MAX150AEWP+ suits digital panel meter front ends because its 1.34 µs conversion time and integrated track/hold enable continuous sampling of slowly-varying process signals (4-20 mA-derived voltages, thermocouple amplifier outputs) at hundreds of samples per second. With the internal +2.5 V reference providing 8-bit accuracy without external buffering, the BOM shrinks to the ADC plus a few decoupling caps and an input RC filter. The 8080/6800-style three-state latching output bus interfaces directly to the panel meter's microcontroller, allowing the firmware to read conversion results on demand via CS/RD control. Compared to a discrete ADC + external SHA + external reference chain, this part eliminates two components and reduces board area by ~30%.
Recomendado
Portable Test and Measurement Instrumentation
Handheld multimeters, battery-powered oscilloscope front ends, and portable data loggers benefit from the MAX150AEWP+'s single +5 V supply operation, internal track/hold, and internal +2.5 V reference - features that simplify power-tree design and reduce total component count. The 1.34 µs conversion time supports digitizing audio-bandwidth signals (up to ~370 kHz Nyquist-limited) for FFT analysis in spectrum-analyzer accessories. The 8-bit resolution is sufficient for bar-graph displays, envelope detection, and trending displays where 1% precision is not required. Per the Maxim datasheet, the part's low digital-noise coupling and proper input RC network (100 Ω + 100 pF) keep SNR acceptable for these moderate-precision applications.
Recomendado
Audio Bandwidth Digitizing for Spectrum Analyzers
The MAX150AEWP+ enables digitizing audio-band signals (20 Hz to 20 kHz) at rates up to several hundred kilosamples per second thanks to its 1.34 µs half-flash conversion time and integrated track/hold. This bandwidth is more than adequate for spectrum-analyzer front ends, audio crossover analyzers, and acoustic measurement tools that need FFT-grade data. The internal reference provides 8-bit linearity without external buffering, simplifying the analog signal chain. Compared to using a separate ADC + SHA + reference chain, the integrated solution reduces noise pickup, lowers BOM cost, and shortens design cycles for OEM audio test equipment.
Recomendado
Embedded Microcontroller Data Acquisition Systems
The MAX150AEWP+ is designed specifically for 8080/6800-style microprocessor interfaces, with CS/RD/WR control inputs and an end-of-conversion INT/OUT signal that allows direct bus attachment to legacy microcontrollers (8051, 68HC11, Z80). In modern designs, the same bus timing maps easily to a generic GPIO-bit-banged interface on STM32, PIC, or AVR microcontrollers. The integrated track/hold and internal +2.5 V reference remove the need for external precision components, simplifying firmware and hardware. With 1.34 µs conversion time, the part enables polling-based acquisition at hundreds of samples per second with deterministic interrupt latency.
Recomendado
Industrial Process Control Analog Input Modules
PLC analog input modules, distributed control system (DCS) I/O cards, and SCADA remote terminal units (RTUs) often use 8-bit ADCs at the front end for cost-sensitive analog channels where 1% accuracy is acceptable. The MAX150AEWP+ suits these roles because of its single +5 V supply operation, integrated track/hold (eliminating external SHA maintenance), and latching digital output that interfaces cleanly to industrial backplane microcontrollers. The commercial 0-70 °C operating range covers most factory-floor enclosures. According to Maxim's datasheet, the part's robust design and wide supply tolerance make it a reliable workhorse for cost-optimized process-control channels.
Recomendado
Legacy Computer and Peripheral Board Replacement
The MAX150AEWP+ is widely used to repair and modernize legacy 8-bit computer systems, ISA-bus data acquisition cards, and GPIB instrumentation front ends from the 1980s and 1990s. Its SOIC-20 footprint, 8080/6800 bus interface, and 1.34 µs conversion time match the timing requirements of these vintage architectures. According to the Maxim datasheet family, the part is electrically and mechanically compatible with the original MAX150A and MX7820 designs, making it a drop-in upgrade for legacy systems. Sourcing through authorized distributors with documented lot traceability is essential for industrial-grade repair programs.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX150AEWP+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX150AEWP+T | MX7820KCWP+ | MX7820KEWP+ |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | SOIC-20 | SOIC-20 | SOIC-20 | SOIC-20 |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits |
| Conversion Time | 1.34 µs | 1.34 µs | 1.34 µs | 1.34 µs |
| Architecture | Half-Flash | Half-Flash | Half-Flash | Half-Flash |
| Internal Reference | +2.5 V | +2.5 V | +2.5 V | +2.5 V |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single |
| Operating Temperature | 0 to +70 °C | 0 to +70 °C | 0 to +70 °C | -40 to +85 °C |
| RoHS Status | Compliant (+ suffix) | Compliant (+ suffix) | Compliant (+ suffix) | Compliant (+ suffix) |
Principais diferenciais
- Integrated track/hold amplifier and +2.5 V reference on-chip (vs Discrete ADC + external SHA + external reference chain)
- Half-flash architecture achieves 1.34 µs conversion (vs Successive-approximation 8-bit ADCs (typically 5-50 µs))
- Pin-compatible with the original MX7820 family (vs Non-pin-compatible alternate sources)
- 8080/6800-style three-state latching bus with CS/RD/WR/INT (vs Serial-interface 8-bit ADCs (SPI/I2C))
Notas de projeto
The MAX150AEWP+ analog input does NOT have a traditional switched-capacitor SHA in front - it uses an internal charge-compensation technique that is sensitive to source impedance. Maxim's datasheet recommends a 100 Ω series resistor plus a 100 pF capacitor at the AIN pin to limit transient kickback when the input mux switches. Skipping this RC network can cause conversion-to-conversion variation of 1-2 LSB even on a DC input.
Route the analog ground (GND, pin 2) and digital ground (VSS, pins 5 and 14) separately back to a single-point star ground at the ADC's GND pin to avoid digital switching noise coupling into the analog input. Place the 0.1 µF +5 V decoupling capacitors as close as possible to the VDD and VSS pins. Keep the analog input trace short and away from the digital output bus to minimize capacitive coupling - the digital outputs toggle at full TTL edges during read cycles.
Estimated: at +5 V supply and 1.34 µs conversion cycle with TTL outputs driving 1 LS-TTL load, average supply current is on the order of 10-15 mA. Decouple with both a 10 µF bulk electrolytic (or tantalum) and a 0.1 µF ceramic on each supply pin pair. For battery-powered designs, the part does not have a power-down mode, so a separate analog switch upstream may be needed to minimize quiescent drain.
Place the MAX150AEWP+ SOIC-20 close to the microcontroller's bus port to keep the DB0-DB7 traces short (<50 mm). The CS, WR/RD, and INT/OUT control lines should be routed in a separate group from the analog AIN/VREF lines. If the design uses ratiometric sensing (input tied to VREF), keep the analog input trace short to avoid IR drop that degrades ADC accuracy - this is the dominant error source in ratiometric designs.
The digital outputs (DB0-DB7) swing full TTL levels (0 V to 4 V typical) and can source/sink several mA. If the output bus is shared with other peripherals, add 10 kΩ pull-ups on each line to ensure a defined high state when the MAX150AEWP+ is deselected (CS high). Glitches on the digital bus can inject noise into the analog domain through VDD/VSS coupling - critical at the 1 LSB level for 8-bit precision.
Informações de conformidade
RoHS and lead-free compliance indicated by the '+' suffix per Maxim/Analog Devices part-number convention. AEC-Q100 not applicable - this is a commercial-grade (0-70 °C) part; industrial-temperature variant (MAX150_EWP) is available for harsher environments. Halogen-free status not explicitly stated in retrieved web data.
