MAX145BEPA - 12-Bit 108ksps 2-Ch Serial ADC | Maxim Integrated
部品番号: MAX145BEPA ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $9.88 | $9.88 |
| 10 | $8.95 | $89.50 |
| 100 | $7.42 | $742.00 |
| 500 | $6.18 | $3,090.00 |
| 1,000 | $5.29 | $5,290.00 |
MAX145BEPA 概要
A SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm through an internal DAC to digitize an analog input one bit at a time per clock cycle. SAR ADCs are prized for low latency (deterministic acquisition time), high accuracy at moderate sample rates, and the absence of pipeline delay, making them well-suited to multiplexed multi-channel data-acquisition systems, instrumentation, and process control.
Key features include two single-ended analog input channels (CH0, CH1) selected via software, an analog supply range of +2.7V to +5.25V, an external reference input (REF), and a low supply current that drops to microamp levels in power-down mode. The MAX145BEPA industrial-grade (-40C to +85C) PDIP package supports through-hole assembly and is fully RoHS compliant in the + variant (MAX145BEPA+).
Architecturally, the MAX145BEPA integrates an input sample-and-hold, an internal 12-bit DAC, a comparator, a successive-approximation register, and SPI-compatible digital I/O on a single CMOS die. The automatic power-down function between conversions reduces average supply current to a fraction of the active value, which is critical for battery-powered or energy-harvesting applications.
Typical applications include portable data loggers, industrial process-control front-ends, battery-powered instrumentation, sensor signal conditioning read-out, and handheld metering equipment where 12-bit resolution at up to 108 kilosamples per second is sufficient. When laying out a PCB, keep analog and digital grounds joined at a single point near the ADC GND pin to preserve the 12-bit accuracy across the full sample rate.
ドロップイン代替品: MAX145BEPA — 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: MAX145BEPA （同一形状・フットプリント） — 相違点: Conversion Time, Input Type, Number of Channels, Operating Temperature Range, RoHS Status.
クイック比較ツール — 並列比較する代替部品を選択:
MAX145AEPA
✅ ドロップイン✓ 在庫あり
$5.2 / 個
データシートを見る →MAX145BEPA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX144BEPA
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX145BEPA 最大定格＆電気的特性
| 分解能 | 12 bits |
| Number of Channels | 2 (single-ended) |
| Sample Rate | 108 ksps |
| Conversion Time | 7.4 us (successive approximation) |
| Wake-Up Time from Power-Down | 2.5 us |
| Analog Supply Voltage | +2.7 V to +5.25 V |
| Digital Logic Supply | Same as analog supply (single supply) |
| Input Type | Single-ended, CH0 / CH1 |
| Reference Input | External (REF pin) |
| Serial Interface | 3-wire SPI / QSPI / MICROWIRE-compatible |
| Built-in Clock | Yes (internal) |
| Automatic Power-Down | Yes (between conversions) |
| パッケージ | 8-pin PDIP (through-hole) |
| 動作温度範囲 | -40 C to +85 C (industrial) |
| 実装タイプ | Through-Hole |
| RoHS ステータス | Compliant (MAX145BEPA+ variant) |
MAX145BEPA ピン構成
| ピン 1 | VDD — Power supply (+2.7V to +5.25V) |
| ピン 2 | CH0 — Analog input channel 0 |
| ピン 3 | CH1 — Analog input channel 1 (MAX145 only) |
| ピン 4 | GND — Ground |
| ピン 5 | REF — External reference voltage input |
| ピン 6 | DOUT — Serial data output (SPI) |
| ピン 7 | CS — Chip select (active low) |
| ピン 8 | DIN/SCLK — Serial data in / serial clock (shared SPI input) |
主な用途
MAX145BEPA の用途: 6 件s: Battery-Powered Data Logger, Industrial Process-Control Front-End, Handheld Metering & Test Equipment, Sensor Signal Conditioning Read-Out, Portable Medical Monitoring Devices, Automotive Sensor Read-Out (Non-Safety).
Battery-Powered Data Logger
The MAX145BEPA's 12-bit resolution and 108 ksps sample rate allow accurate digitization of slow analog sensor channels such as temperature, pressure and battery voltage in portable data-logging equipment. According to the MAX144/MAX145 datasheet, automatic power-down reduces active current to a few microamps between conversions, enabling months of operation from a single Li-ion or AA battery pack. With 2 multiplexed channels (CH0/CH1) and an external reference, the MAX145BEPA delivers sufficient dynamic range for sensor signal conditioning while keeping the BOM small.
おすすめ
Industrial Process-Control Front-End
In PLC analog input modules and process-control instrumentation, the MAX145BEPA digitizes 4-20 mA current-loop or 0-10V transducer signals with 12-bit accuracy at up to 108 ksps aggregate throughput. Its +2.7V to +5.25V single-supply operation tolerates 24V industrial rails after external signal conditioning, and its -40C to +85C industrial temperature grade covers factory-floor environments. The 3-wire SPI interface connects directly to host microcontrollers and PLC communication ASICs without external glue logic.
おすすめ
Handheld Metering & Test Equipment
The MAX145BEPA's small 8-pin PDIP footprint and low average supply current make it ideal for handheld multimeters, insulation testers and portable calibration instruments. According to the MAX144/MAX145 datasheet, the 2.5 microsecond wake-up from power-down enables continuous on-demand conversions triggered by the host microcontroller, while preserving battery life between measurement cycles. The 7.4 microsecond acquisition-to-conversion latency is fast enough to capture transient signals during automated test sequences.
おすすめ
Sensor Signal Conditioning Read-Out
For strain-gauge bridges, thermocouple amplifiers and other low-bandwidth sensor front-ends, the MAX145BEPA provides 12-bit resolution with low integral nonlinearity suitable for capturing sensor output voltages in the millivolt-to-5V range. Its external reference input allows scaling the ADC full-scale range to the sensor output swing, maximizing effective resolution. The 3-wire SPI/QSPI/MICROWIRE-compatible interface simplifies integration with common low-power MCUs and DSPs in embedded sensor nodes.
おすすめ
Portable Medical Monitoring Devices
The MAX145BEPA's combination of 12-bit resolution, 108 ksps capability, low power consumption and -40C to +85C temperature range suits battery-powered medical monitoring peripherals such as pulse-oximeter front-ends, blood-pressure monitor signal read-out, and bedside patient monitors requiring 1-2 analog channels. According to the datasheet, automatic power-down and 2.5 microsecond wake-up minimize average current draw, while the SPI interface enables direct connection to low-power MCUs typically used in medical device designs.
おすすめ
Automotive Sensor Read-Out (Non-Safety)
While the MAX145BEPA is not AEC-Q100 qualified, its -40C to +85C industrial temperature range and 5V supply tolerance suit non-safety automotive applications such as cabin climate sensor read-out, body-comfort modules and infotainment analog audio level sensing. The 8-pin PDIP package is preferred for prototyping and through-hole production runs in aftermarket automotive electronics. For safety-critical powertrain or ADAS applications requiring AEC-Q100, choose a qualified alternative.
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: MAX145BEPA — 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 | MAX145AEPA | MAX145BEPA+ | MAX144BEPA |
|---|---|---|---|---|
| Package | PDIP-8 | PDIP-8 - same | PDIP-8 - same | PDIP-8 - same |
| Brand | Maxim Integrated | Maxim Integrated - same | Maxim Integrated - same | Maxim Integrated - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Channels | 2 (CH0, CH1) | 2 (CH0, CH1) | 2 (CH0, CH1) | 1 (CH0 only) |
| Sample Rate | 108 ksps | 108 ksps | 108 ksps | 108 ksps |
| Supply Voltage | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +5.25V |
| INL/DNL Grade | Standard (B-grade) | A-grade (tighter linearity) | Standard (B-grade), RoHS | Standard (B-grade) |
| RoHS Compliance | Non-compliant (no + suffix) | Non-compliant (no + suffix) | RoHS-compliant (+ suffix) | Non-compliant (no + suffix) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
主な差別化要因
- Same-die A-grade with tighter linearity, drop-in compatible （vs MAX145AEPA)
- RoHS-compliant variant of the same die （vs MAX145BEPA+)
- Compatible 1-channel variant when CH1 is not used （vs MAX144BEPA)
設計ノート
Route analog (CH0, CH1, REF) and digital (DOUT, DIN/SCLK, CS) traces separately, and join analog and digital grounds at a single point - typically at the ADC GND pin or at the decoupling-capacitor ground. According to the MAX144/MAX145 datasheet reference layout, this star-ground topology preserves 12-bit accuracy at full 108 ksps by preventing digital switching currents from corrupting the analog input and reference voltages.
Place a 0.1 microfarate ceramic decoupling capacitor as close as possible to the VDD pin and a 10 microfarate bulk bypass capacitor at the board supply entry. According to the MAX144/MAX145 datasheet, the internal reference/sample-and-hold settling is sensitive to high-frequency VDD ripple - good bypassing ensures specified INL/DNL is achieved. For systems operating above 50 ksps continuous, add an additional 1 microfarate capacitor in parallel with the 0.1 microfarate.
Do not leave any unused analog input (e.g. CH1 on MAX145) floating - tie unused inputs to midscale or ground to prevent charge-injection crosstalk into the active channel. The REF pin must be driven by a low-impedance reference (or a 10 microfarate + 0.1 microfarate RC network) - never leave REF floating or the conversions will be invalid. The CS pin must be held low during the entire conversion to avoid losing synchronization.
コンプライアンス情報
Non-compliant for RoHS as the legacy MAX145BEPA lacks the + suffix. The MAX145BEPA+ variant is RoHS compliant and lead-free. Not AEC-Q100 qualified - not suitable for automotive safety-critical applications. Choose qualified parts (e.g. MAX11120ATI+T) for AEC-Q100 designs.
