MAX1284BCSA - 12-Bit 400ksps SAR ADC | Maxim Integrated
料号： MAX1284BCSA ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $14.55 | $14.55 |
| 10 | $13.4 | $134.00 |
| 100 | $12.2 | $1,220.00 |
| 500 | $11.05 | $5,525.00 |
| 1,000 | $9.95 | $9,950.00 |
MAX1284BCSA 概述
A SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm against an internal DAC to convert an analog input to a digital code one bit at a time over a fixed number of clock cycles. SAR ADCs occupy the position between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slower) in the converter hierarchy, and are the workhorse choice for general-purpose data acquisition, industrial control, and instrumentation where a balance of speed, resolution, and deterministic latency is required. Within the Maxim ADC portfolio, the MAX1284 belongs to the low-power serial-interface family and offers the highest sampling rate of the MAX1240/MAX1241 generation.
Key features include 400 ksps throughput, single +4.5 V to +5.5 V supply operation, an internal +2.5 V reference (eliminating the need for an external precision reference), low power consumption (typically under 5 mW at full speed), SPI/QSPI/MICROWIRE-compatible serial interface, and a 0 to +5 V unipolar analog input range when using the internal reference. The 8-pin SOIC narrow-body package minimises board area while providing commercial-grade temperature performance.
The MAX1284 uses a charge-redistribution SAR architecture with an input track/hold and on-chip +2.5 V bandgap reference. The 4.5 V minimum supply and internal reference architecture make it well suited to +5 V-rail systems; for 3.3 V-rail designs the pin-compatible MAX1285 offers the same 12-bit 300 ksps performance from +2.7 V to +3.6 V.
Typical applications include portable data logging, data acquisition systems, medical instruments, battery-powered instruments, pen digitizers, and process control. When designing with this device, ensure the analog input is within the 0 to VREF range (or 0 to 2xVREF with external reference), place a 0.1 uF decoupling capacitor close to VDD, and observe proper SPI mode timing (CPOL=0, CPHA=0) for reliable serial communication. The MAX1284 is the drop-in higher-speed alternative to the MAX1240/MAX1241 with identical pinout.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： MAX1284BCSA ——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： MAX1284BCSA （相同外形与封装尺寸） ——差异在于 Package, Input Type, Number of Channels, Resolution, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
MAX1284BCSA+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX1284BESA+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1285BCSA+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1284AESA+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1284ACSA+T
✅ 直接替换✓ 有现货
$6.45 / 个
查看数据手册 →MAX1284BCSA 最大额定值与电气特性
| 分辨率 | 12 bit |
| 采样率 | 400 ksps |
| Number of Input Channels | 1 (single-ended) |
| Architecture | SAR (Successive Approximation) |
| 电源电压 | 4.5 V to 5.5 V (single supply) |
| Internal Reference | +2.5 V |
| Analog Input Range | 0 to VREF (unipolar, single-ended) |
| Serial Interface | SPI / QSPI / MICROWIRE-compatible |
| 封装 | 8-pin SOIC (narrow-body, 150 mil) |
| 工作温度 | 0 C to +70 C (commercial) |
| Pinout Compatibility | Pin-compatible with MAX1240/MAX1241 family |
| Input Type | Single-ended, unipolar |
| Track/Hold | Yes, on-chip high-bandwidth T/H |
| RoHS 状态 | Compliant |
| 安装类型 | Surface Mount |
MAX1284BCSA 引脚配置
| 引脚 1 | VDD — Power supply input, +4.5 V to +5.5 V |
| 引脚 2 | REF — Internal +2.5 V reference output / external reference input |
| 引脚 3 | AIN — Analog input (single-ended, 0 to VREF unipolar) |
| 引脚 4 | GND — Ground |
| 引脚 5 | DOUT — Serial data output (SPI/MICROWIRE) |
| 引脚 6 | SSTRB — Serial strobe / conversion status output |
| 引脚 7 | CS — Active-low chip select input |
| 引脚 8 | SCLK — Serial clock input |
典型应用
MAX1284BCSA 适用于 6 应用s: Portable Data Logging, Data Acquisition Systems, Medical Instruments, Pen Digitizers, Process Control, Battery-Powered Instruments.
Portable Data Logging
The MAX1284BCSA suits battery-powered data loggers needing 12-bit resolution at up to 400 ksps with minimal external parts. The internal +2.5 V reference eliminates an external precision reference IC, the single +4.5 V to +5.5 V supply simplifies power-tree design, and 8-SOIC footprint minimises PCB area. Typical power consumption stays under 5 mW at full speed per the Maxim datasheet, extending battery life. Pair the MAX1284BCSA with a low-power MCU such as a MAX32625 or PIC for USB-tethered or wireless data loggers in field-deployed sensors and condition-monitoring equipment.
推荐
Data Acquisition Systems
The MAX1284BCSA fits 12-bit multi-channel data acquisition front-ends when paired with an external MUX or instrumentation front end. The 400 ksps throughput, single-ended input, and SPI-compatible serial interface make it easy to read through an MCU or FPGA at high burst rates. The internal +2.5 V reference supports a 0-2.5 V input range, and the 8-SOIC narrow-body keeps the analog front end compact. Per the Maxim datasheet, the track/hold bandwidth supports AC inputs up to several hundred kHz without significant attenuation.
推荐
Medical Instruments
The MAX1284BCSA is recommended by Maxim for medical instrument applications including patient monitors, diagnostic equipment, and handheld medical devices. The 12-bit resolution and 400 ksps speed are sufficient for ECG, pulse oximetry front ends, and other low-frequency physiological signals. The 5 V single-supply operation simplifies medical-grade isolation power designs, and the 8-SOIC package aids miniaturisation. The internal reference improves measurement repeatability, which is critical for clinical-grade accuracy. Consider the MAX1284BESA+ (-40 C to +85 C) for environments with temperature variation.
推荐
Pen Digitizers
The MAX1284BCSA is well matched to pen-digitiser and stylus input circuits that need fast, low-latency sampling of position-sensing analog signals. The 400 ksps SAR conversion provides deterministic latency (no pipeline delay) which is critical for real-time position tracking. The 12-bit resolution is sufficient to capture the analog signal from the digitiser coil with 0.6 mV LSB precision (at +2.5 V reference). The 8-SOIC package fits inside slim stylus hardware, and the SPI/QSPI/MICROWIRE interface allows fast sample streaming to the host MCU.
推荐
Process Control
The MAX1284BCSA fits industrial process-control modules measuring 4-20 mA or 0-10 V analog process variables where 12-bit resolution is sufficient. The 400 ksps throughput handles multi-channel scanned inputs faster than typical loop rates (1 kHz). The internal +2.5 V reference can be overdriven by an external precision reference for higher-accuracy process measurements. The 8-SOIC package and 5 V supply integrate well with industrial 24 V-to-5 V backplane power designs. Use the MAX1284BESA+ for outdoor or unconditioned plant environments.
推荐
Battery-Powered Instruments
The MAX1284BCSA is specified by Maxim for battery-powered instruments requiring low quiescent power and minimal external components. At under 5 mW typical operating power, the part preserves battery life in handheld multimeters, portable calibrators, and field service tools. The internal +2.5 V reference removes the need for an external reference IC, reducing BOM cost and quiescent current. The 8-SOIC narrow package fits inside compact handheld enclosures. For 3.3 V battery systems, drop in the pin-compatible MAX1285BCSA+ at 300 ksps with the same low-power profile.
推荐
推荐产品汇总
工程参考数据： MAX1284BCSA ——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 | MAX1284BCSA+T | MAX1284BESA+ | MAX1285BCSA+ | MAX1284AESA+ | MAX1284ACSA+T |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) |
| Package | 8-SOIC (narrow) | 8-SOIC (narrow) - same | 8-SOIC (narrow) - same | 8-SOIC (narrow) - same | 8-SOIC (narrow) - same | 8-SOIC (narrow) - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 400 ksps | 400 ksps | 400 ksps | 300 ksps | 400 ksps | 400 ksps |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 3.6 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C | -40 C to +85 C |
| Internal Reference | +2.5 V | +2.5 V | +2.5 V | +2.5 V | +2.5 V | +2.5 V |
| Pinout Compatibility | MAX1240/MAX1241 family | Pin-to-pin identical | Pin-to-pin identical | Pin-to-pin identical | Pin-to-pin identical | Pin-to-pin identical |
关键差异点
- Highest 12-bit speed in MAX1240/MAX1241 pin-compatible family （对比 MAX1285BCSA+)
- Industrial-temperature grade option with identical pinout （对比 MAX1284BESA+)
- Automotive AEC-Q100 grade option for harsh environments （对比 MAX1284AESA+)
设计说明
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin (pin 1) to suppress high-frequency noise on the +5 V supply. Per the Maxim datasheet, a bulk 10 uF tantalum or ceramic capacitor on the VDD rail is also recommended. The internal +2.5 V reference on pin 2 should be bypassed with a 1 uF to 10 uF capacitor to minimise reference noise during conversion. Poor power decoupling is the most common cause of degraded ADC SNR in 12-bit systems.
Route the analog input (AIN, pin 3) and ground (GND, pin 4) traces as a differential pair with a ground guard to minimise coupled noise. Keep the analog input trace away from digital lines (SCLK, DOUT, CS, SSTRB) to avoid digital switching noise coupling into the analog front end. The 8-SOIC narrow-body package simplifies layout, but place a small ground pour under the IC to shield the analog input from the digital output lines on the other side of the package.
Do not exceed the +5.5 V absolute maximum on VDD, as this can permanently damage the device. The analog input AIN must remain within the 0 to VREF range when using the internal reference; signals outside this range will saturate the ADC and may damage the input stage. When using an external reference, the reference must be capable of driving the REF pin decoupling capacitor without oscillation. Per the Maxim datasheet, the CS pin must stay high (or held inactive) during power-up to avoid false conversions.
合规信息
RoHS and REACH compliance per Maxim Integrated/Analog Devices product page. The MAX1284BCSA+ (with + suffix) is the RoHS-compliant version; the MAX1284BCSA (without +) may not be RoHS compliant. AEC-Q100 not qualified for the base MAX1284BCSA - choose MAX1284AESA+ for automotive-grade.
