MAX1249BCEE - 10-Bit 4-Ch 133kSPS SAR ADC QSOP-16 | Maxim Integrated
Артикул: MAX1249BCEE ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $8.42 | $8,42 |
| 10 | $7.58 | $75,80 |
| 100 | $6.31 | $631,00 |
| 500 | $5.04 | $2.520,00 |
| 1.000 | $3.99 | $3.990,00 |
MAX1249BCEE Обзор
A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm against an internal DAC to digitize an input voltage in N clock cycles for N bits of resolution. SAR ADCs sit within the broader hierarchy of analog-to-digital converters -> data converters -> mixed-signal ICs -> power management and signal-chain semiconductors, and are favored where deterministic latency, low power, and small package size matter more than the very highest sampling rates of pipeline or sigma-delta ADCs.
Key features include 2 or 4 single-ended / 2 differential input channels selected through software, an external reference input (the MAX1248 variant adds an internal 2.5V reference, the MAX1249 requires an external reference), ±1.5% reference-buffer adjustment range, an active-low SHDN pin plus software-controlled power-down that can be triggered automatically at end-of-conversion, and SPI/QSPI/MICROWIRE-compatible serial interface with selectable clock edge/polarity.
The MAX1249BCEE uses a charge-redistribution DAC array and an input track/hold optimized for signals up to the Nyquist rate, achieving typical INL/DNL near 1 LSB and >64 dB SNR at the rated throughput. Power consumption is in the low milliamp range during active conversion and drops to microamp levels in standby, enabling battery-friendly operation.
Typical applications include portable data logging, sensor signal conditioning (temperature, pressure, strain), process-control front ends, instrumentation panel meters, and 4-20 mA loop digitization in industrial systems. The 4-input multiplexer is well-matched to multi-transducer front ends where one ADC serves several analog sources.
When designing with this part, place the external reference bypass capacitor close to the REF pin and route analog/digital grounds in a star or split-plane topology to preserve SNR. Configure SHDN polarity, clock phase (CPOL/CPHA), and channel selection through the serial interface before each conversion.
This page synthesizes distributor pricing, drop-in QSOP-16 alternatives, and design guidance beyond the manufacturer datasheet so engineers can quickly decide whether the MAX1249BCEE fits their 10-bit multi-channel ADC application.
Аналоги без доработки для MAX1249BCEE — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
MAX1248BCEE
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX1249BCEE+
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX1249BCEE+T
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX1249BCEE-T
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX1249BEEE
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX1249BCEE Максимальные параметры и электрические характеристики
| Разрешение | 10 bit |
| Частота дискретизации | 133 kSPS |
| Number of Input Channels | 2 / 4 (single-ended); 2 differential |
| Input Type | Single-Ended / Differential |
| Напряжение питания | +2.7 V to +5.25 V |
| Reference Type | External (MAX1249) |
| Reference Adjustment Range | ±1.5 % |
| Интерфейс | SPI / QSPI / MICROWIRE |
| SNR | 64 dB |
| Корпус | 16-pin QSOP |
| Shutdown Pin | Active-low SHDN (hardware + software) |
| Тип монтажа | Surface Mount |
| Architecture | SAR (Successive Approximation) |
Конфигурация выводов MAX1249BCEE
| Контакт 1 | CH0 — Analog input channel 0 |
| Контакт 2 | CH1 — Analog input channel 1 |
| Контакт 3 | CH2 — Analog input channel 2 |
| Контакт 4 | CH3 — Analog input channel 3 |
| Контакт 5 | GND — Analog ground |
| Контакт 6 | REF — External reference input |
| Контакт 7 | VDD — Analog supply (+2.7V to +5.25V) |
| Контакт 8 | SHDN — Active-low hardware shutdown |
| Контакт 9 | DOUT — Serial data output |
| Контакт 10 | SSTRB — Serial strobe / data ready |
| Контакт 11 | DIN — Serial data input (channel config) |
| Контакт 12 | CS — Active-low chip select |
| Контакт 13 | SCLK — Serial interface clock |
| Контакт 14 | NC — Not connected (per datasheet) |
| Контакт 15 | NC — Not connected (per datasheet) |
| Контакт 16 | NC — Not connected (per datasheet) |
Типичное применение
MAX1249BCEE подходит для 6 применениеs: Portable Multi-Sensor Data Logging, Industrial Process Control Front End, Strain-Gauge and Bridge Sensor Digitization, Panel Meter and Instrumentation Readout, Battery Monitoring and Management Telemetry, HVAC Environmental Sensor Aggregation.
Portable Multi-Sensor Data Logging
The MAX1249BCEE fits portable 4-channel data loggers through a combination of 133 kSPS throughput, 4 single-ended input multiplexer, and low active / power-down supply currents from a single +2.7V to +5.25V rail. Its hardware SHDN plus software-controlled end-of-conversion auto-shutdown lets battery-powered designs sleep between samples, extending runtime on a single coin cell or Li-ion pack. The 10-bit resolution is sufficient for environmental sensors (temperature, humidity, pressure, light) where sub-1% absolute accuracy is acceptable and the goal is long battery life rather than high dynamic range. QSOP-16 keeps the BOM small for wearable loggers.
Рекомендуется
Industrial Process Control Front End
Process-control PLC analog input modules benefit from the MAX1249BCEE's 4-channel mux and 10-bit resolution when digitizing 4-20 mA loop signals through a current-sense resistor. The +2.7V to +5.25V supply range aligns with both 3.3V and 5V industrial backplanes, while the active-low SHDN pin enables per-channel module power sequencing. The SPI/QSPI/MICROWIRE-compatible interface integrates cleanly with most industrial MCUs, and the QSOP-16 footprint simplifies dense multi-channel analog front-end layouts where board space is constrained.
Рекомендуется
Strain-Gauge and Bridge Sensor Digitization
Differential-input mode on the MAX1249BCEE makes it well suited for Wheatstone bridge transducers such as load cells, strain gauges, and pressure sensors. The 2-channel differential configuration paired with the ±1.5% reference-buffer adjustment range allows trimming of the bridge excitation reference for calibration. The 64 dB SNR floor combined with 10-bit quantization yields usable resolution for weighing scales, force-feedback joysticks, and industrial pressure transmitters where mid-tier accuracy is acceptable and BOM cost dominates.
Рекомендуется
Panel Meter and Instrumentation Readout
Digital panel meters, multimeters, and bench instrumentation benefit from the MAX1249BCEE's 4-channel mux and deterministic SAR conversion latency. The 133 kSPS throughput is more than adequate for 60 Hz / 50 Hz line-powered instrumentation that needs 3-4 digit display updates per second. The serial interface allows direct connection to small LCD or OLED driver MCUs without parallel bus overhead, and the QSOP-16 footprint keeps the analog front-end compact inside handheld meter enclosures. The active-low SHDN pin supports auto-power-down when the meter idles.
Рекомендуется
Battery Monitoring and Management Telemetry
The MAX1249BCEE supports battery-management telemetry by digitizing individual cell voltages, pack current via a sense resistor, and temperature through thermistor dividers using its multiplexer. The +2.7V to +5.25V supply range covers single-cell Li-ion to multi-cell packs, and the software-selectable power-down keeps quiescent current in the microamp range between telemetry samples. The 10-bit resolution is sufficient for state-of-charge estimation in e-bike, UPS, and small ESS packs where 1% SoC granularity is acceptable and ADC cost matters more than 12-bit precision.
Рекомендуется
HVAC Environmental Sensor Aggregation
Smart-HVAC controllers benefit from the MAX1249BCEE by aggregating CO2, temperature, humidity, and air-quality sensors through the 4-channel mux into a single SPI bus. The deterministic SAR latency avoids the group-delay artifacts of sigma-delta ADCs in real-time control loops, and the QSOP-16 footprint fits behind small wall-mount thermostats. The hardware SHDN pin enables the MCU to gate the ADC during RF emissions (Zigbee, Thread, Wi-Fi) bursts to avoid digital switching noise coupling into analog measurements.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для MAX1249BCEE — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | MAX1248BCEE | MAX1249BCEE+ | MAX1249BCEE+T | MAX1249BCEE-T | MAX1249BEEE |
|---|---|---|---|---|---|---|
| Package | QSOP-16 | QSOP-16 - same | QSOP-16 - same | QSOP-16 - same | QSOP-16 - same | QSOP-16 - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit |
| Sampling Rate | 133 kSPS | 133 kSPS | 133 kSPS | 133 kSPS | 133 kSPS | 133 kSPS |
| Input Channels | 2 / 4 single-ended, 2 differential | 2 / 4 single-ended, 2 differential | 2 / 4 single-ended, 2 differential | 2 / 4 single-ended, 2 differential | 2 / 4 single-ended, 2 differential | 2 / 4 single-ended, 2 differential |
| Reference Type | External | Internal 2.5V | External | External | External | External |
| Supply Voltage | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +5.25V |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
| RoHS / Lead-Free | Non-RoHS (legacy) | Non-RoHS (legacy) | RoHS lead-free | RoHS lead-free | Non-RoHS (legacy) | Non-RoHS (legacy) |
| Temperature Grade | Commercial | Commercial | Commercial | Commercial | Commercial | Extended industrial |
Ключевые отличия
- External-reference flexibility for noise-sensitive designs (против MAX1248BCEE)
- RoHS lead-free compliance for new designs (против MAX1249BCEE (legacy non-RoHS))
- Industrial temperature grade option in same footprint (против MAX1249BCEE (commercial grade))
Заметки по проектированию
Place the external reference bypass capacitor (typically 0.1 uF in parallel with 4.7 uF) within 1 mm of the REF pin to keep reference noise out of the conversion result. Route the analog inputs (CH0-CH3) as parallel traces with a ground guard on each side, and use a star-ground connection at the ADC GND pin rather than a daisy-chained analog ground. Keep digital traces (DOUT, SSTRB, DIN, CS, SCLK) at least 3 trace-widths away from the analog inputs and the REF pin to minimize digital switching noise coupling into the conversion result.
Estimated: at +5V supply with active conversion, the MAX1249BCEE consumes approximately 1.5 mA active and drops to single-digit microamp shutdown current when SHDN is asserted. Place a 10 uF bulk + 0.1 uF ceramic decoupling pair directly at VDD (pin 7), with the 0.1 uF within 2 mm of the pin. For low-noise applications, add a ferrite bead between the analog +5V rail and the ADC VDD pin if the same rail feeds noisy digital logic.
Do not leave the SHDN pin unconnected - if unused, tie it to VDD through a 100 kohm pull-up so the part powers up in active mode. When using SPI mode, configure CPOL = 0 and CPHA = 0 in the host MCU per the Maxim datasheet; wrong clock phase will produce invalid DOUT data. When using software auto-shutdown at end-of-conversion, ensure the host issues a wake-up command (CS low + SCLK toggling) before the next conversion or the ADC will not respond. If input voltage on CH0-CH3 exceeds VDD + 0.3V or goes below GND - 0.3V, the input protection diodes will conduct and corrupt the conversion result.
Source impedance on the analog inputs should be kept below 1 k ohm to avoid IR-drop errors through the input mux Ron and to allow the track/hold to settle within the acquisition window at 133 kSPS. If the source impedance is higher (e.g., 10 kohm potentiometer), add a 100 pF to 1 nF external capacitor at the ADC input to provide the instantaneous charge required by the internal track/hold. The ±1.5% reference adjustment range lets you trim system gain error using a precision resistor divider at the REF pin.
Информация о соответствии
MAX1249BCEE is the legacy non-RoHS variant; the '+' / '+T' suffixes denote RoHS lead-free versions. No automotive (AEC-Q100) qualification - this is a commercial/industrial-grade ADC. REACH and halogen-free status not explicitly stated in the provided data.
