MAX1084BCSA - 400ksps Serial 10-Bit ADC | Maxim Integrated
部品番号: MAX1084BCSA ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $9.95 | $9.95 |
| 10 | $8.96 | $89.60 |
| 100 | $7.46 | $746.00 |
| 500 | $6.21 | $3,105.00 |
| 1,000 | $5.18 | $5,180.00 |
MAX1084BCSA 概要
An analog-to-digital converter (ADC) is a data-acquisition component that converts a continuous analog input voltage into a discrete digital code. SAR (Successive Approximation Register) ADCs use a binary-search algorithm against an internal DAC to resolve each conversion in N clock cycles, where N is the bit resolution (10 cycles for a 10-bit ADC). They sit within the data-converter hierarchy: ADC -> data converter -> data acquisition IC -> signal chain -> mixed-signal SoC. Compared with delta-sigma ADCs, SAR converters offer higher sample rates and lower latency, making them ideal for multiplexed multi-channel systems.
Key features include 4.5V to 5.5V single-supply operation, an internal 2.5V reference (MAX1084A/MAX1085A) or external reference option, a high-speed SPI/QSPI/MICROWIRE-compatible serial interface, and low power consumption (typical 1.9mA at 400ksps, dropping to under 10µA in shutdown). The serial-interface daisy-chain capability allows multiple ADCs to share one processor port, reducing board area in multi-channel designs.
The MAX1084BCSA uses a capacitive-charge redistribution SAR architecture with an input track-and-hold capable of handling full-scale inputs up to VREF. Its serial interface outputs MSB-first data with an external SCLK, simplifying connection to microcontrollers and DSPs. The 'BC' speed-grade suffix denotes the 400ksps MAX1084 variant (the 300ksps MAX1085 uses 'AC').
Typical applications include remote-sensor signal acquisition, portable data loggers, battery-powered instrumentation, multi-channel multiplexed data-acquisition systems, and pen-digitizer or touch-screen interfaces. Designers favor this part when serial output, small footprint (SO-8), and low quiescent current matter most.
A practical design consideration: because the part is specified for 4.5V-5.5V analog supply, it is not directly 3.3V-rail compatible without a level shifter or local LDO. Decouple AVDD with a 10µF tantalum in parallel with a 0.1µF ceramic placed within 5mm of the supply pin.
This page synthesizes real distributor pricing, pin-compatible drop-in alternatives from the Maxim MAX108x family, and practical PCB design notes not consolidated on any single distributor or manufacturer page.
ドロップイン代替品: MAX1084BCSA — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: MAX1084BCSA （同一形状・フットプリント） — 相違点: Package, RoHS Status, Architecture, Resolution, Data Interface.
クイック比較ツール — 並列比較する代替部品を選択:
MAX1084BCSA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1084BCSA+T
✅ ドロップイン✓ 在庫あり
$4.9 / 個
データシートを見る →MAX1085BCSA
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1085BCSA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1084ACSA
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1085ACSA
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1084BCSA 最大定格＆電気的特性
| 分解能 | 10 bit |
| Sample Rate | 400 ksps (MAX1084) / 300 ksps (MAX1085) |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended, Pseudo-Differential |
| Analog Supply Voltage | 4.5 V to 5.5 V |
| Digital Supply Voltage | 4.5 V to 5.5 V |
| Internal Reference Voltage | 2.5 V (A-grade only) |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| 動作温度 | 0 C to +70 C (commercial, 'C' suffix) |
| パッケージ | SOIC-8 (CSA) |
| 実装タイプ | Surface Mount |
| Power Consumption | 1.9 mA typical at 400 ksps |
| シャットダウン電流 | < 10 uA |
| RoHS ステータス | Non-RoHS (MAX1084BCSA, no '+' suffix); RoHS on MAX1084BCSA+ |
| Speed Grade Suffix | 'BC' = MAX1084 400ksps, 'AC' = MAX1085 300ksps |
MAX1084BCSA ピン構成
| ピン 1 | AVDD — Analog +5V supply input (4.5V to 5.5V) |
| ピン 2 | AIN — Analog input to the track-and-hold |
| ピン 3 | REF — External reference input (2.5V nominal for B-grade) |
| ピン 4 | AGND — Analog ground return for AVDD |
| ピン 5 | DGND — Digital ground for serial interface |
| ピン 6 | SCLK — Serial clock input (SPI/QSPI/MICROWIRE-compatible) |
| ピン 7 | DOUT — Serial data output, MSB first |
| ピン 8 | CS — Active-low chip-select; tie high for shutdown mode |
主な用途
MAX1084BCSA の用途: 6 件s: Remote-Sensor Signal Acquisition, Portable Battery-Powered Data Loggers, Multi-Channel Multiplexed Data Acquisition Systems, Industrial Process Control Loops, Pen-Digitizer and Touch-Screen Interfaces, Automotive Sensor Interface (Non-Safety).
Remote-Sensor Signal Acquisition
The MAX1084BCSA fits remote-sensor signal acquisition thanks to its single-supply 4.5V-5.5V operation, sub-10µA shutdown current, and small SOIC-8 footprint. Place the ADC between a sensor bridge (load cell, strain gauge, or thermocouple amplifier) and a microcontroller; the SAR architecture resolves 10-bit conversions in 10 clock cycles for low-latency updates. Compared to a delta-sigma ADC, the MAX1084 adds negligible latency, which is critical when sampling at 400ksps. Use the 2.5V external reference for stable ratiometric measurements across temperature.
おすすめ
Portable Battery-Powered Data Loggers
Portable data loggers benefit from the MAX1084BCSA's 1.9mA active supply current and under-10µA shutdown mode, which directly extend battery life on a 4 x AA or lithium coin cell boosted to 5V. The serial interface draws no extra I/O current because data clocks out only on SCLK edges. At 400ksps, the ADC can digitize fast transients from accelerometers or peak-detect circuits while idle most of the time in shutdown. Tie CS high during sleep windows to keep the data logger in microamp quiescent state.
おすすめ
Multi-Channel Multiplexed Data Acquisition Systems
Multi-channel data-acquisition systems leverage the MAX1084BCSA's SPI/QSPI/MICROWIRE-compatible serial daisy-chain mode, which lets multiple ADCs share one microcontroller SPI port. Place one MAX1084BCSA per channel on the PCB and wire the DOUT of one chip to the DIN of the next, clocked by a single SCLK. This arrangement reduces host-pin count from N CS lines to 1, saving GPIO on small MCUs. Each SO-8 ADC measures only 5x6mm, enabling 8 channels in less than 4 cm² of board area.
おすすめ
Industrial Process Control Loops
Industrial 4-20mA loop monitoring and 0-10V process-control acquisition are well served by the MAX1084BCSA's 10-bit resolution and 400ksps throughput. Use an external op-amp front-end (e.g. MAX9910) to level-shift and filter the loop current before the ADC's AIN pin, and digitize at 400ksps to capture step responses on solenoid valves. The commercial 0°C to +70°C grade suits panel-mounted controllers; for harsher environments, choose the industrial-grade MAX1084BESA counterpart.
おすすめ
Pen-Digitizer and Touch-Screen Interfaces
Touch-screen and pen-digitizer front-ends use the MAX1084BCSA to digitize the X/Y position signals from a resistive touch panel. The 400ksps sample rate captures pen-lift events at 4ms resolution - well below human perception - while the SOIC-8 package fits next to the touch connector on compact handheld boards. Route AVDD and AGND with a star ground to keep ADC noise out of the position calculation. Pair with a microcontroller that generates SCLK from a hardware SPI peripheral for tight timing.
おすすめ
Automotive Sensor Interface (Non-Safety)
Non-safety automotive subsystems - infotainment HMI controls, HVAC panel sensors, seat-position potentiometers - can use the MAX1084BCSA to digitize analog signals behind the head unit. The 10-bit resolution over a 0-5V analog supply matches typical 5V-referenced sensor outputs. Because the part is specified only for 0°C to +70°C commercial temperature, place it inside the cabin module rather than in an under-hood environment; pair with an external 2.5V reference for ratiometric wiper-position sensing. The SOIC-8 footprint is friendly to wave-solder automotive assembly lines.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX1084BCSA — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MAX1084BCSA+ | MAX1084BCSA+T | MAX1085BCSA | MAX1085BCSA+ | MAX1084ACSA | MAX1085ACSA |
|---|---|---|---|---|---|---|---|
| Package | SOIC-8 (CSA) | SOIC-8 (CSA) - same | SOIC-8 (CSA) - same | SOIC-8 (CSA) - same | SOIC-8 (CSA) - same | SOIC-8 (CSA) - same | SOIC-8 (CSA) - same |
| Brand | Maxim Integrated | Maxim Integrated - same | Maxim Integrated - same | Maxim Integrated - same | Maxim Integrated - same | Maxim Integrated - same | Maxim Integrated - same |
| Sample Rate | 400 ksps | 400 ksps | 400 ksps | 300 ksps (-25%) | 300 ksps (-25%) | 400 ksps | 300 ksps (-25%) |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit |
| Internal Reference | No (external required) | No (external required) | No (external required) | No (external required) | No (external required) | Yes (2.5V internal) | Yes (2.5V internal) |
| RoHS Compliance | Non-RoHS | RoHS compliant | RoHS compliant | Non-RoHS | RoHS compliant | Non-RoHS | Non-RoHS |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| Supply Current (typ at full speed) | 1.9 mA at 400 ksps | 1.9 mA at 400 ksps | 1.9 mA at 400 ksps | ~1.5 mA at 300 ksps | ~1.5 mA at 300 ksps | 1.9 mA at 400 ksps | ~1.5 mA at 300 ksps |
主な差別化要因
- Pin-compatible RoHS upgrade path on the same die （vs MAX1084BCSA)
- Lower-speed variant preserves 100% pinout （vs MAX1085BCSA)
- Internal reference option eliminates external reference network （vs MAX1084ACSA)
設計ノート
Decouple AVDD (pin 1) with a 10µF tantalum in parallel with a 0.1µF ceramic placed within 5mm of the supply pin; an additional ferrite bead between AVDD and the digital 5V rail prevents digital switching noise from coupling into the analog reference. Tie CS high between conversions to enter shutdown mode and drop the supply current to under 10µA - critical for battery-powered data loggers.
Route the AGND (pin 4) and DGND (pin 5) grounds as a star connection to a single low-impedance ground plane node to avoid digital return currents flowing through the analog ground reference. Place the external reference decoupling capacitor (typically 0.1µF) directly across REF (pin 3) and AGND (pin 4). Keep the AIN trace short and surrounded by AGND to minimize coupled noise pickup at full 400ksps conversion rate.
The MAX1084BCSA's serial interface (SCLK/DOUT) operates from the digital 5V supply; if the host microcontroller runs on 3.3V logic, insert a 74LVC125 or similar level translator to avoid exceeding the absolute-maximum DVDD rating. Drive SCLK with a clean 50%-duty-cycle clock up to the maximum specified by the datasheet timing diagram; do not gate SCLK with software loops because jitter directly degrades effective resolution at 400ksps.
Do not assume the MAX1084 family works at 3.3V - the datasheet specifies 4.5V-5.5V only. Also confirm the speed grade before PCB layout: 'BC' = MAX1084 (400ksps), 'AC' = MAX1085 (300ksps). Pulling CS high before the conversion completes leaves DOUT in an indeterminate state - always wait for the full 10 SCLK pulses or for the next CS edge to clean up the interface.
コンプライアンス情報
MAX1084BCSA (no '+' suffix) is non-RoHS; the '+' variant MAX1084BCSA+ is RoHS compliant. Part is NRND (Not Recommended for New Designs) per Maxim/ADI status; AEC-Q100 not applicable for commercial grade.
