MAX128BENG - 12-Bit 8Ch 8ksps I2C DAS ADC, DIP-24 | Maxim
部品番号: MAX128BENG ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $14.95 | $14.95 |
| 10 | $13.46 | $134.60 |
| 100 | $11.95 | $1,195.00 |
| 500 | $10.5 | $5,250.00 |
| 1,000 | $9.2 | $9,200.00 |
MAX128BENG 概要
A data acquisition system (DAS) is an integrated analog front end that combines a multi-channel input mux, sample-and-hold amplifier, analog-to-digital converter, voltage reference, and serial interface in a single IC. The MAX128 belongs to the successive-approximation-register (SAR) ADC category, which excels at medium-speed, medium-resolution conversions without the latency of delta-sigma converters. The MAX128 family sits in the IC hierarchy as: SAR ADC -> analog-to-digital converter -> data converter -> mixed-signal IC -> semiconductor.
Key features include eight single-ended or four differential analog input channels, software-configurable input ranges of 0 to +5V, 0 to +10V, ±5V, ±10V, 0 to +15V, and ±15V (a unique bipolar capability in this speed class), a 2-wire I2C-compatible serial interface, hardware SHDN pin plus two software-programmable power-down modes, and an internal 4.096V reference. The +5V single-supply operation simplifies power tree design, and the bipolar input range eliminates the need for negative rail generation in many industrial applications.
The MAX128 uses a classic SAR architecture with a capacitive DAC, providing deterministic latency and no pipeline delay. The 2-wire interface supports up to eight devices on one bus, allowing expansion to 64 channels per I2C bus when all eight address bits are used. The device includes an input protection network on each analog channel to survive ESD and overvoltage events common in industrial environments.
Typical applications include industrial process control and sensor monitoring, multichannel data logging, portable instrumentation, and embedded industrial control boards where through-hole DIP packages simplify rework and field service. The wide bipolar input range is particularly useful for reading 4-20 mA loop-derived signals, strain gauge bridges, and thermocouple-conditioned signals directly.
When designing with the MAX128, place the 0.1uF + 10uF decoupling pair as close to the analog supply pin as possible, and keep digital SDA/SCL traces short and away from analog input traces. The internal reference requires an external 4.7uF bypass; do not use a smaller value or the reference noise will degrade the SNR floor. The I2C address is set by the AD0 pin (low = 0x50, high = 0x52); on the DIP package this pin is accessible and strap-able.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet alone.
ドロップイン代替品: MAX128BENG — 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: MAX128BENG （同一形状・フットプリント） — 相違点: Package, RoHS Status, Supply Voltage, Sampling Rate, Input Voltage Range.
クイック比較ツール — 並列比較する代替部品を選択:
MAX128BCNG
✅ ドロップイン✓ 在庫あり
$10.27 / 個
データシートを見る →MAX127BENG
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1270BENG
✅ ドロップイン✓ 在庫あり
$19.85 / 個
データシートを見る →MAX1274AETC+
✅ ドロップイン✓ 在庫あり
$4.42 / 個
データシートを見る →MAX128BENG 最大定格＆電気的特性
| 分解能 | 12 bits |
| Number of Channels | 8 single-ended / 4 differential |
| サンプリングレート | 8 ksps |
| ADC Architecture | SAR (Successive Approximation Register) |
| 電源電圧 | +5 V (single analog supply) |
| Input Voltage Ranges | 0 to 5V, 0 to 10V, ±5V, ±10V, 0 to 15V, ±15V |
| Digital Interface | 2-wire I2C-compatible (SDA, SCL) |
| Internal Reference Voltage | 4.096 V |
| Shutdown Modes | Hardware SHDN + software standby + full power-down |
| I2C Address Select | AD0 pin (0x50 or 0x52) |
| 動作温度 | -40C to +85C (E suffix) |
| パッケージ | 24-pin PDIP (DIP-24) |
| 実装タイプ | Through-Hole (THT) |
| RoHS ステータス | Compliant (G suffix - lead-free finish) |
| Data Interface | I2C serial, up to 8 devices per bus |
MAX128BENG ピン構成
| ピン 1 | AIN0 — Analog Input Channel 0 |
| ピン 2 | AIN1 — Analog Input Channel 1 |
| ピン 3 | AIN2 — Analog Input Channel 2 |
| ピン 4 | AIN3 — Analog Input Channel 3 |
| ピン 5 | AIN4 — Analog Input Channel 4 |
| ピン 6 | AIN5 — Analog Input Channel 5 |
| ピン 7 | AIN6 — Analog Input Channel 6 |
| ピン 8 | AIN7 — Analog Input Channel 7 |
| ピン 9 | AGND — Analog Ground |
| ピン 10 | REF — Reference Voltage (4.096V internal) |
| ピン 11 | AVDD — Analog +5V Supply |
| ピン 12 | SHDN — Hardware Shutdown (active low) |
| ピン 13 | SDA — I2C Serial Data |
| ピン 14 | SCL — I2C Serial Clock |
| ピン 15 | AD0 — I2C Address Select (0x50 or 0x52) |
| ピン 16 | DGND — Digital Ground |
| ピン 17 | DVDD — Digital +5V Supply |
| ピン 18 | NC — Not connected |
| ピン 19 | NC — Not connected |
| ピン 20 | NC — Not connected |
| ピン 21 | NC — Not connected |
| ピン 22 | NC — Not connected |
| ピン 23 | NC — Not connected |
| ピン 24 | NC — Not connected |
主な用途
MAX128BENG の用途: 6 件s: Industrial Process Control and PLCs, Multichannel Data Logging Systems, Portable Test and Measurement Instruments, Embedded Industrial Sensor Interface Boards, Medical Patient Monitoring Equipment, Automotive Sensor and Telematics Modules.
Industrial Process Control and PLCs
The MAX128BENG is a strong fit for industrial process control and programmable logic controller (PLC) analog input modules because its ±15V bipolar input range directly accepts 4-20 mA loop-derived 1-5V signals, thermocouple-conditioned millivolt signals through the wide bipolar range, and 0-10V industrial transducers without level shifting. With 8 single-ended / 4 differential channels and 12-bit / 8 ksps performance, one MAX128 handles up to 8 analog inputs per I2C bus address, and two devices (selected via AD0) can expand to 16 channels. The 24-pin PDIP through-hole package simplifies field service and rework in industrial cabinets. The I2C interface is read by an MCU or PLC CPU, while the hardware SHDN pin enables low standby current (<10 uA) between scans, critical for 24/7 plant uptime. Design consideration: decouple AVDD with 0.1uF + 10uF and isolate digital SDA/SCL traces from analog inputs to prevent crosstalk in noisy motor control cabinets.
おすすめ
Multichannel Data Logging Systems
For multichannel data loggers recording temperature, pressure, and flow in remote or battery-powered installations, the MAX128BENG provides 12-bit resolution at 8 ksps across 8 single-ended channels with I2C interface - one IC replaces 8 separate ADC components. The wide ±15V input range allows direct connection to industrial pressure transducers and strain gauge bridges that produce bipolar outputs, eliminating signal conditioning. The hardware SHDN pin and software-programmable standby modes drop supply current to under 10 uA between conversion bursts, extending battery life in remote solar-powered data loggers. The internal 4.096V reference with external 4.7uF bypass maintains conversion accuracy across the -40C to +85C industrial temperature range. Design consideration: enable SHDN between scans to minimize quiescent current, and use the AD0 pin to allow two devices on the same I2C bus for 16-channel logging capacity.
おすすめ
Portable Test and Measurement Instruments
The MAX128BENG fits portable test and measurement instruments (handheld multimeters, oscilloscope front-ends, signal analyzers) because its 8 single-ended or 4 differential channels in a 24-pin PDIP support multi-mode measurements (voltage, current via shunt, temperature via thermocouple) from a single IC. The 12-bit / 8 ksps performance is adequate for measurements up to ~4 kHz bandwidth, and the ±15V input range directly handles high-voltage signals without external dividers. The I2C interface minimizes MCU pin consumption - only 2 wires needed versus 12+ for parallel ADCs - freeing pins for displays and keypads. The 24-pin PDIP through-hole form factor is rugged for field-serviceable portable instruments, and the -40C to +85C extended temperature range handles outdoor industrial inspections. Design consideration: add input protection TVS diodes to the analog inputs to survive accidental overvoltage events in field use.
おすすめ
Embedded Industrial Sensor Interface Boards
For embedded industrial sensor interface boards used in motor drives, HVAC controllers, and SCADA remote terminal units, the MAX128BENG provides a compact 8-channel analog input front end with I2C interface that offloads ADC complexity from the host MCU/DSP. The wide bipolar ±15V input range accepts AC-coupled industrial signals (current transformers, line voltage monitors) directly, while the 12-bit resolution provides 0.4% full-scale accuracy suitable for closed-loop feedback control. The 8 ksps sampling rate tracks motor speed, temperature, and vibration signals in real time. The hardware SHDN pin enables sequenced power-up coordinated with the host processor, and the 24-pin PDIP package supports both prototyping and production volumes. Design consideration: use differential input mode for noisy industrial environments to reject common-mode noise picked up on long sensor cables.
おすすめ
Medical Patient Monitoring Equipment
The MAX128BENG is used in medical patient monitoring equipment (bedside monitors, ambulatory recorders) where its 8 single-ended channels read multiple vital signs - ECG, respiration, SpO2, temperature - from a single IC. The 12-bit / 8 ksps performance is sufficient for ECG sampling (typically 500 Hz per channel) and respiration waveforms. The wide ±15V input range accommodates direct connection to instrumentation amplifier outputs without signal scaling, and the I2C interface keeps the medical device's MCU pin count low - critical for compact, lightweight wearable designs. The -40C to +85C temperature range supports the IEC 60601-1 medical environmental test standards. The 24-pin PDIP package is well suited to through-hole medical device assembly for serviceability. Design consideration: provide input ESD protection to meet IEC 60601-1 patient-safety requirements.
おすすめ
Automotive Sensor and Telematics Modules
For automotive sensor and telematics modules (OBD-II data loggers, fleet management devices, EV battery management secondary sensors), the MAX128BENG provides 8 channels of 12-bit / 8 ksps conversion with the -40C to +85C extended temperature range required for under-hood and cabin-mounted automotive environments. The wide ±15V input range directly reads 12V automotive battery voltage, alternator output, and various 0-12V automotive sensor signals without external dividers. The I2C interface integrates with automotive-grade MCUs over a 2-wire bus shared with other peripherals. The hardware SHDN pin enables low-quiescent-current sleep mode during vehicle parking, important for telematics battery drain budgets. Design consideration: add load-dump and reverse-battery protection at the supply input to survive ISO 7637 automotive transient events.
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: MAX128BENG — 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 | MAX128BCNG | MAX127BENG | MAX1270BENG | MAX1274AETC+ |
|---|---|---|---|---|---|
| Brand | Analog Devices (formerly Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | PDIP-24 (DIP-24) | PDIP-24 - same | PDIP-24 - same | PDIP-24 - same | PDIP-24 - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 8 ksps | 8 ksps | 8 ksps | 225 ksps (28x faster) | 225 ksps (28x faster) |
| Number of Channels | 8 single-ended / 4 differential | 8 SE / 4 diff | 8 SE / 4 diff | 8 SE / 4 diff | 4 SE / 2 diff (50% reduction) |
| Input Voltage Range | 0-5V to ±15V (6 ranges) | 0-5V to ±15V | 0-5V to ±15V | ±5V only (narrower) | ±5V only (narrower) |
| Operating Temperature | -40C to +85C | 0C to +70C (commercial, narrower) | -40C to +85C | -40C to +85C | -40C to +85C |
| I2C Address Select | AD0 pin (2 addresses) | AD0 pin (2 addresses) | No (2 hardwired addresses only) | AD0 + AD1 (4 addresses) | AD0 pin (2 addresses) |
主な差別化要因
- Extended industrial temperature range （vs MAX128BCNG)
- I2C address selection capability （vs MAX127BENG)
- Wider input voltage range （vs MAX1270BENG)
設計ノート
The MAX128BENG requires a clean +5V analog supply on AVDD (pin 11) and a separate +5V digital supply on DVDD (pin 17). Place a 0.1uF ceramic + 10uF tantalum or ceramic bypass pair as close as possible to AVDD, and a 0.1uF ceramic on DVDD. The internal 4.096V reference at the REF pin (pin 10) requires a dedicated 4.7uF external bypass capacitor to AGND - using a smaller value (e.g. 0.1uF) will cause reference noise to degrade SNR and introduce gain error. If powering from a switching regulator, add a ferrite bead or LC filter between the switcher output and AVDD to prevent switching noise from coupling into conversions.
Route SDA and SCL traces short and keep them away from analog input traces to prevent digital switching noise from coupling into analog channels via capacitive crosstalk. Use a ground plane under the IC and route AGND and DGND to a single-point star ground at the PCB's analog ground return. For long analog input cables (sensor wires), use shielded cable and connect the shield to AGND at the MAX128 end only. In noisy industrial environments, configure unused analog inputs to differential mode and tie the inactive pin to a quiet reference to minimize common-mode noise pickup.
Do not apply signals beyond ±15V to the analog input pins - the absolute maximum is ±16.5V. Forgetting the 4.7uF bypass on the REF pin is a common mistake that causes erratic conversion results. The I2C address depends on the AD0 pin state at power-up - ensure AD0 is tied cleanly to either GND (0x50) or VDD (0x52) with a short trace, not left floating. The SHDN pin is active low - leave it floating for always-on operation, or drive high through a 10k-ohm pull-up. Note: 24-pin DIP pin 18-24 are listed as NC in some datasheet revisions - verify against the latest datasheet revision for your specific lot.
コンプライアンス情報
RoHS compliant per G suffix (lead-free finish) on BENG. Not AEC-Q100 qualified - automotive applications requiring AEC-Q100 should consider automotive-qualified Maxim ADCs. REACH compliance per Maxim/Analog Devices product declaration.
