MAX1084BESA - 10-Bit 400ksps SAR ADC | Maxim Integrated
料号： MAX1084BESA ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.7 | $2,350.00 |
| 1,000 | $4.25 | $4,250.00 |
MAX1084BESA 概述
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm against an internal DAC to digitize an analog input one bit at a time per clock cycle. The architecture is favored for medium-resolution, medium-speed precision applications because it delivers deterministic latency and excellent DC accuracy without the complexity of pipeline or delta-sigma stages. SAR converters sit within the broader data-converter hierarchy above flash and integrating ADCs but below most delta-sigma and pipelined architectures in conversion speed.
Key features of the MAX1084BESA include 400 ksps sampling rate, an internal +2.5V reference (eliminating an external reference component), single 5V analog supply operation, an SPI-/QSPI-/MICROWIRE-compatible serial interface, and a hardware shutdown pin for power saving. Low power consumption and an 8-pin small-outline package make the device well-suited to space- and energy-constrained designs.
The MAX1084BESA is pin-compatible and a higher-speed functional upgrade to the legacy MAX1242/MAX1243 family, allowing designers to migrate existing boards to faster sampling with no PCB rework. Compared with the slower MAX1085 (300 ksps), it doubles throughput for the same package and pinout, simplifying BOM consolidation across speed variants.
Typical applications include remote-sensor signal acquisition, industrial process control, portable instrumentation, weigh scales, and patient-monitoring front ends. The internal reference and small SO footprint reduce external parts count for handheld and battery-powered systems.
When designing in this part, place the 0.1 µF bypass capacitor as close to the supply pin as the layout allows and keep analog/digital grounds joined at a single star point. Use the SHDN pin in battery-powered designs to idle the converter between conversions and minimize quiescent draw. The serial interface allows galvanic isolation through low-cost digital isolators where patient-safety or industrial isolation is required.
直接替换替代料： MAX1084BESA ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX1084BESA （相同外形与封装尺寸） ——差异在于 Analog Supply Voltage, Digital Supply Voltage, Package, Resolution, Input Type.
快速对比工具——选择替代料号进行并排对比：
MAX1084BESA+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1084BCSA
✅ 直接替换✓ 有现货
$5.18 / 个
查看数据手册 →MAX1084BCSA+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX1242CSA+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX1067BCEE
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$9.4 / 个
查看数据手册 →MAX1084BESA 最大额定值与电气特性
| 分辨率 | 10 bits |
| 采样率 | 400 ksps |
| Number of Input Channels | 1 single-ended |
| Input Type | Single-ended |
| Architecture | SAR (Successive Approximation) |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Configuration | S/H-ADC (1:1) |
| Reference Type | Internal +2.5V |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 5 V |
| 封装 | 8-SOIC (SO-8) |
| 安装类型 | Surface Mount |
| 引脚数量 | 8 |
| Shutdown Pin | Yes (active-low SHDN) |
| RoHS 状态 | RoHS-compliant MAX1084BESA+ variant available |
MAX1084BESA 引脚配置
| 引脚 1 | AIN — Analog input |
| 引脚 2 | REF — Reference bypass / internal +2.5V reference node |
| 引脚 3 | AVDD — Analog +5V supply |
| 引脚 4 | GND — Ground |
| 引脚 5 | SHDN — Active-low shutdown input |
| 引脚 6 | DOUT — Serial data output |
| 引脚 7 | SCLK — Serial clock input |
| 引脚 8 | DVDD — Digital +5V supply |
典型应用
MAX1084BESA 适用于 6 应用s: Remote-Sensor Data Acquisition, Industrial Process Control, Portable Instrumentation, Weigh-Scale Readout, Patient Monitoring, Battery-Powered Data Loggers.
Remote-Sensor Data Acquisition
The MAX1084BESA suits remote-sensor data-acquisition front ends because of its 400 ksps sampling rate, integrated +2.5V reference, and single +5V supply that minimize external part count. With only three or four SPI lines, designers can stream conversion results directly into an MCU or low-power DSP sitting on the same board. The internal SHDN pin drops quiescent draw between conversions, extending battery life in field-deployed sensor nodes. Compared to the slower legacy MAX1242/MAX1243 family, the MAX1084BESA delivers a roughly 5x throughput increase in the same 8-pin SO footprint, easing migration of existing sensor board designs without PCB rework.
推荐
Industrial Process Control
In process-control loops the MAX1084BESA digitizes 4-20 mA-conditioned transducer signals with deterministic SAR latency that simplifies digital compensation. Its 400 ksps rate captures fast loop dynamics while the 10-bit resolution is sufficient for valve-position, level, and pressure readings. The internal +2.5V reference keeps calibration drift within the typical ±50 ppm/°C envelope expected of industrial front ends, reducing the number of reference components on the bill of materials. Galvanic isolation can be added around the SPI bus using common digital isolators, preserving data integrity across hazardous-area boundaries.
推荐
Portable Instrumentation
Portable test instruments benefit from the MAX1084BESA's small 8-SOIC footprint and low power consumption, which together extend handheld-device runtime and shrink enclosure size. The internal +2.5V reference eliminates the need for a bulky external reference, while the SHDN pin powers down the converter between measurements, cutting quiescent current dramatically. The 400 ksps rate comfortably handles bandwidths from sensor front ends to mid-speed audio-band signal analysis in multimeters and handheld oscilloscope probes.
推荐
Weigh-Scale Readout
Weigh-scale designs use the MAX1084BESA to digitize load-cell bridge outputs after instrumentation-amplifier conditioning, where the SAR architecture's excellent linearity and low group-delay variation preserve scale accuracy. The 400 ksps throughput captures transient shocks during weighing events, while the internal +2.5V reference anchors the ADC's full-scale calibration across the operating temperature range. Using the SHDN pin to idle the ADC between operator-triggered readings keeps battery drain on retail-bench scales extremely low, supporting long coin-cell or USB-bus-powered operation.
推荐
Patient Monitoring
Patient-monitoring equipment such as pulse-oximeter and ECG front ends pairs the MAX1084BESA with low-noise analog signal conditioning, where the ADC's 400 ksps rate oversamples the physiological signal chain to enable digital filtering on the host MCU or DSP. The internal +2.5V reference reduces per-board component cost, helping OEMs meet tight BOM targets on high-volume medical disposables. SPI isolation between the analog front end and the host processor preserves patient-safety creepage and clearance requirements. Designers should pair the MAX1084BESA with appropriate IEC 60601-rated isolation and supply architecture for clinical equipment.
推荐
Battery-Powered Data Loggers
Battery-powered data loggers rely on the MAX1084BESA's combination of single +5V supply, internal reference, and hardware shutdown to minimize idle drain between scheduled samples. The 400 ksps throughput captures fast transient events (e.g., vibration or shock) for later post-processing, while the small 8-SOIC package keeps the board compact inside sealed logging enclosures. Using the SHDN pin under MCU control cycles the ADC on only when needed, often reducing average supply current to under 1 mA across a typical logging duty cycle.
推荐
推荐产品汇总
工程参考数据： MAX1084BESA ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX1084BESA+ | MAX1084BCSA | MAX1242CSA+ | MAX1067BCEE |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC narrow body - same family | 8-SOIC - same | 16-QSOP (different) |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 10 bits | 10 bits | 10 bits | 10 bits | 12/14 bits |
| Sampling Rate | 400 ksps | 400 ksps | 400 ksps | 73 ksps (approx.) | Up to 200 ksps (approx.) |
| Number of Channels | 1 single-ended | 1 single-ended | 1 single-ended | 1 single-ended | Up to 8 single-ended |
| Reference | Internal +2.5V | Internal +2.5V | Internal +2.5V | Internal +2.5V | External reference |
| Supply Voltage | +5 V | +5 V | +5 V | +2.7 V to +5.25 V | +5 V |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI serial | SPI/QSPI/MICROWIRE |
关键差异点
- Higher throughput in the same 8-pin SO footprint （对比 MAX1242CSA+)
- RoHS-compliant lead-free + variant available （对比 MAX1084BESA (obsolete, lead-containing))
- Single +5V supply with internal +2.5V reference （对比 MAX1067BCEE)
设计说明
Estimated: at AVDD=DVDD=5V with 400 ksps continuous sampling, the MAX1084BESA typical supply current is in the low-mA range per the Maxim datasheet. Use the SHDN pin to reduce quiescent draw between conversions when the host MCU is idle, which can drop total system current below 100 µA in battery-powered designs.
Place the 0.1 µF supply-decoupling capacitor as close as possible to the AVDD and DVDD pins, with a short, low-impedance ground return to the GND pin. Keep the analog (AIN, REF) traces short and away from the SCLK/DOUT digital lines to limit digital-to-analog crosstalk on this 10-bit ADC.
Do not share AVDD and DVDD via a single ferrite-bead filter without adequate local bypassing, or the 5V rail noise may couple into the reference and degrade ADC linearity. Always tie SHDN high through a pull-up or drive it from the MCU; leaving SHDN floating can put the part into an undefined shutdown state and prevent conversions.
合规信息
MAX1084BESA+ is RoHS-compliant and lead-free per Maxim product information. Legacy MAX1084BESA is obsolete; transition to the + variant for new designs.
