MAX154BCAG+T - 8-Bit 4Ch 400ksps 5V Precision ADC | Maxim
N.º de pieza: MAX154BCAG+T ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $9.85 | $9,85 |
| 10 | $8.95 | $89,50 |
| 100 | $7.55 | $755,00 |
| 500 | $6.3 | $3.150,00 |
| 1.000 | $5.2 | $5.200,00 |
MAX154BCAG+T Descripción general
An ADC (Analog-to-Digital Converter) is a data-acquisition IC that translates continuous analog voltages into discrete digital codes, sitting at the boundary between the analog sensor domain and the digital processor domain within the broader signal chain hierarchy of sensor -> analog front end -> ADC -> microcontroller/DSP. The MAX154BCAG+T belongs to the successive-approximation register (SAR) ADC family, the dominant topology for medium-speed, medium-resolution applications up to a few MSPS where deterministic latency and low power consumption matter more than the raw throughput of pipeline ADCs. Its on-chip 2.5 V reference removes the need for an external precision reference IC, simplifying the BOM for cost-sensitive multi-channel systems.
Key features include four single-ended analog inputs with software-configurable channel selection, a 2.5 us successive-approximation conversion engine, on-chip 2.5 V reference (and optional external reference mode), three-state digital outputs for direct microprocessor bus interface, single +5 V supply operation with low CMOS power dissipation, and a half-LSB quantization step of 9.8 mV when using the internal 2.5 V reference across the 0 V to 5 V input span. The internal reference also sources up to 5 mA external current, useful for biasing external signal-conditioning circuitry.
The MAX154 architecture pairs a capacitive-DAC SAR core with an input track-and-hold and a low-drift buried-zener reference, achieving the +/-1 LSB integral nonlinearity specified for the B grade and providing a complete data-acquisition subsystem in a single IC. The four input channels share a single ADC core through an internal analog multiplexer, reducing silicon cost relative to per-channel dedicated converters at the expense of throughput during sequential channel scans.
Typical applications include data-acquisition front ends for industrial process-control PLCs, multi-slot rack-mounted instrumentation, supervisory distribution and data-logging systems, embedded control boards monitoring temperature/pressure/flow sensors, and portable or rack-mount medical-instrument signal chains. The wide supply tolerance and integrated reference also make it attractive for low-cost microcontroller-based measurement nodes.
When designing with this ADC, place the 0.1 uF + 10 uF supply bypass capacitors as close as possible to the +VDD and DGND pins to prevent digital noise from coupling into the analog comparator. Use AGND and DGND star-grounding at the IC reference pin, and verify that the source impedance seen at AIN pins stays below 2.5 kohm to keep track-and-hold settling errors below 0.5 LSB at 400 ksps.
This page synthesizes distributor pricing, drop-in alternatives from the Maxim MAX154/MAX158 family, and practical design notes not collected in the manufacturer datasheet.
Alternativas directas para MAX154BCAG+T — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MAX154BCAG+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX154ACAG+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX154ACAG+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX154AEAG+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX158BCAG+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX154BCAG+T Valores máximos y características eléctricas
| Resolución | 8 bits |
| Number of Analog Input Channels | 4 single-ended |
| Frecuencia de muestreo | 400 ksps |
| Conversion Time | 2.5 us |
| Architecture | SAR (Successive Approximation Register) |
| Integral Nonlinearity (B grade) | +/-1 LSB |
| Rango de tensión de entrada | 0 V to 5 V (with 5 V supply and internal 2.5 V reference, AIN with respect to AGND, full-scale = 2 x VREF) |
| Internal Reference Voltage | 2.5 V |
| Supply Voltage (VDD) | +5 V nominal |
| Digital Interface | Parallel (8-bit) three-state output |
| Rango de temperatura de funcionamiento | 0C to +70C (commercial, C grade) |
| Encapsulado | 24-pin SSOP (CAG), 5.30 mm body width |
| Tipo de montaje | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
Configuración de pines de MAX154BCAG+T
| Pin 1 | AIN1 — Analog Input Channel 1 |
| Pin 2 | AIN2 — Analog Input Channel 2 |
| Pin 3 | AIN3 — Analog Input Channel 3 |
| Pin 4 | AIN4 — Analog Input Channel 4 |
| Pin 5 | AGND — Analog Ground |
| Pin 6 | REF — Reference Voltage Input/Output (2.5 V internal) |
| Pin 7 | VDD — +5 V Power Supply |
| Pin 8 | DGND — Digital Ground |
| Pin 9 | DB0 — Data Bit 0 (LSB) |
| Pin 10 | DB1 — Data Bit 1 |
| Pin 11 | DB2 — Data Bit 2 |
| Pin 12 | DB3 — Data Bit 3 |
| Pin 13 | DB4 — Data Bit 4 |
| Pin 14 | DB5 — Data Bit 5 |
| Pin 15 | DB6 — Data Bit 6 |
| Pin 16 | DB7 — Data Bit 7 (MSB) |
| Pin 17 | RD — Read Strobe (active low) |
| Pin 18 | CS — Chip Select (active low) |
| Pin 19 | WR — Write / Conversion Start |
| Pin 20 | MODE — Mode Select (input channel / read mode) |
| Pin 21 | INT — Interrupt / End-of-Conversion Output |
| Pin 22 | CLK — External Clock Input (or use internal RC) |
| Pin 23 | VSS — Negative Supply / Substrate Connection |
| Pin 24 | NC — Not connected (per datasheet) |
Aplicaciones típicas
MAX154BCAG+T es adecuado para 6 aplicacións: Industrial Process-Control PLC Analog Input Modules, Rack-Mounted Instrumentation and Data-Logging Systems, Embedded Sensor Boards (Temperature/Pressure/Flow), Portable Medical and Clinical Instrumentation Signal Chains, Automotive Sensor Interface and Telematics Modules, Test-and-Measurement Bench Equipment Front Ends.
Industrial Process-Control PLC Analog Input Modules
The MAX154BCAG+T fits PLC analog input modules that need to digitize 4 process variables per module slot. Its 8-bit resolution and 400 ksps sampling rate match typical 4-20 mA loop and 0-10 V sensor signal chains monitoring temperature, pressure, and flow. The integrated 2.5 V reference establishes a stable full-scale range across module-to-module calibration, and the parallel 8-bit bus plugs directly into a microcontroller or backplane ASIC without glue logic. The MAX154's 2.5 us conversion time allows 4 channels to be scanned in roughly 10 us, well below the 1 ms loop time used by most PLC scan engines, leaving headroom for additional filtering or alarm checks. Designers should pay attention to input-source impedance, which must remain below 2.5 kohm to keep settling error under 0.5 LSB at full speed.
Recomendado
Rack-Mounted Instrumentation and Data-Logging Systems
The MAX154BCAG+T is a strong fit for rack-mounted data loggers and instrumentation front ends that aggregate 4 analog channels per acquisition card. The 400 ksps throughput supports vibration, strain-gauge and thermocouple-conditioned signals after low-pass filtering and instrumentation-amp scaling. With +/-1 LSB B-grade linearity, the ADC delivers reliable measurements for trend logging where 8-bit dynamic range maps cleanly to the 0-5 V sensor span. The CMOS low-power dissipation keeps thermal rise manageable inside sealed rack chassis with many parallel acquisition cards. For multi-card systems, the MAX154's three-state parallel outputs can share a backplane data line, allowing a single microcontroller to multiplex many MAX154s across a single 8-bit bus.
Recomendado
Embedded Sensor Boards (Temperature/Pressure/Flow)
Embedded sensor boards monitoring multiple physical variables benefit from the MAX154BCAG+T's integrated 4-channel mux, eliminating the need for an external analog switch. The 5 V single-supply operation aligns with common industrial and HVAC bus rails, and the on-chip 2.5 V reference can drive external RTD excitation resistors for ratiometric temperature measurement. With 400 ksps throughput, the MAX154 supports sampling rates up to 100 kHz per channel in 4-channel sequential scan mode - enough for most mechanical vibration and flow-turbulence spectra. The commercial 0C to 70C operating range covers most factory-floor enclosures; for outdoor or cold-chain applications, the MAX154AEAG+ extended-temperature variant is the recommended upgrade.
Recomendado
Portable Medical and Clinical Instrumentation Signal Chains
The MAX154BCAG+T serves as the front-end ADC for portable medical instruments such as bedside patient monitors, infusion-pump controllers and pulse-oximetry front ends. Its 8-bit resolution digitizes waveform envelopes after analog conditioning, and the 400 ksps rate is sufficient for pulse-rate and respiration envelopes rather than raw ECG. The CMOS low-power dissipation extends battery runtime on portable carts and wearables, while the integrated 2.5 V reference simplifies factory calibration of multiple units. Designers should pair the MAX154 with a low-leakage input mux and ESD protection to meet IEC 60601-1 patient-leakage requirements. The MAX154ACAG+ variant offers lower linearity tolerance at slightly lower cost for non-critical channels.
Recomendado
Automotive Sensor Interface and Telematics Modules
Inside automotive telematics and body-control modules, the MAX154BCAG+T digitizes 4 sensor inputs such as battery current, cabin temperature, fuel-level, and door-switch multiplexed signals. The 5 V supply operation is well-suited to 12 V automotive rails regulated down through an LDO. While the commercial C grade (0C to 70C) does not cover the full automotive -40C to +125C range, the MAX154AEAG+ extended-temperature variant (-40C to +85C) bridges the gap for cabin and under-hood-near applications. Designers should add reverse-battery and load-dump protection upstream, and use the MAX154's three-state parallel bus to share a microcontroller data bus across multiple sensor nodes.
Recomendado
Test-and-Measurement Bench Equipment Front Ends
Bench-top test equipment such as handheld oscilloscope front ends, programmable signal generators and bench multimeters use the MAX154BCAG+T as a low-cost auxiliary ADC for panel-meter and status-monitoring channels. The parallel bus interface simplifies integration with legacy 8051-class and microcontrollers commonly used in test gear, and the 400 ksps rate exceeds the update-rate needs of slow analog meters. The integrated 2.5 V reference is stable enough for panel-meter accuracy without an external precision reference, and the 24-SSOP package is easy to hand-solder or rework on prototype bench boards. When higher resolution is required for the measurement path itself, designers can pair the MAX154 with a separate precision 16-bit ADC on the critical measurement channels.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX154BCAG+T — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX154BCAG+ | MAX154ACAG+T | MAX154ACAG+ | MAX154AEAG+ | MAX158BCAG+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-SSOP (CAG) | 24-SSOP (CAG) - same | 24-SSOP (CAG) - same | 24-SSOP (CAG) - same | 24-SSOP (CAG) - same | 24-SSOP (CAG) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Number of Analog Input Channels | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended | 8 single-ended |
| Sampling Rate | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 400 ksps |
| INL (Linearity Grade) | +/-1 LSB (B grade) | +/-1 LSB (B grade) | +/-2 LSB (A grade) | +/-2 LSB (A grade) | +/-2 LSB (A grade) | +/-1 LSB (B grade) |
| Operating Temperature Range | 0C to +70C (commercial) | 0C to +70C | 0C to +70C | 0C to +70C | -40C to +85C (extended) | 0C to +70C |
| Packaging Form | Tape & Reel (+T) | Tube | Tape & Reel | Tube | Tube | Tube |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
Diferenciadores clave
- Best-in-class 8-bit linearity (+/-1 LSB B grade) at 400 ksps (frente a MAX154ACAG+T (A grade))
- Extended temperature support (-40C to +85C) (frente a MAX154AEAG+ (E grade))
- Doubled channel count in same footprint (frente a MAX158BCAG+)
Notas de diseño
Place a 0.1 uF ceramic bypass capacitor as close as possible to the +VDD pin (pin 7) with the ground return tied directly to the DGND pin (pin 8). Add a 10 uF tantalum or low-ESR ceramic bulk capacitor on the same supply node to handle the ADC's transient current draw during conversion. Per Maxim datasheet recommendations, separate analog and digital supplies with a small ferrite bead or filter resistor if the system uses a common 5 V rail, preventing digital switching noise from coupling into the SAR comparator.
Use a star-ground topology with AGND (pin 5) and DGND (pin 8) tied together at a single point near the IC. Route the parallel 8-bit digital bus (DB0-DB7) away from the analog input traces to minimize digital-to-analog crosstalk. The AIN traces should be guarded by AGND traces on the same side and a continuous ground plane on the opposite layer. Per the Maxim reference design, a 2.5 kohm maximum source impedance at the AIN pins is required to keep track-and-hold settling error under 0.5 LSB at 400 ksps; add a buffer amplifier if the sensor source impedance exceeds this limit.
The MAX154BCAG+T's parallel digital outputs (DB0-DB7) produce fast 5 V transitions that can inject switching noise into the analog section if the output traces are routed back toward the ADC. To minimize digital-to-analog coupling, route the DB0-DB7 bus away from AIN1-AIN4 traces, place the MCU on the opposite side of the PCB, and add a 100 ohm series resistor on each DB line near the ADC if the bus length exceeds 50 mm. The three-state output buffers can be disabled by de-asserting RD (pin 17) to allow bus sharing between multiple MAX154s.
Do not exceed the absolute maximum rating of +6 V on the +VDD pin or apply signals to AIN inputs before VDD is powered up - latch-up or input overvoltage damage may result. The internal 2.5 V reference requires a 10 uF bypass on the REF pin (pin 6) for stability when using the internal reference; do not load the REF pin beyond its 5 mA source capability. When selecting the operating mode via the MODE pin (pin 20), verify the timing relationship between WR, RD and CS per the datasheet timing diagram before connecting to a microcontroller - violating the t_DS setup or t_DH hold timing produces bit errors that look like linearity problems.
Información de cumplimiento
RoHS, REACH, MSL, and conflict_minerology data not present in the verified web data for the MAX154BCAG+T; values marked unknown. The MAX154 family dates from the late 1990s and Maxim's standard product page lists the part as Pb-free (lead-free) per industry-standard lead-free matte-tin finish.
