MAX128BENG - 12-Bit 8Ch 8ksps I2C DAS ADC, DIP-24 | Maxim
MPN: MAX128BENG ✓ Hoạt độngMAX128BENG Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MAX128BENG — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX128BENG (cùng hình factor và footprint) — khác nhau ở Package, RoHS Status, Supply Voltage, Sampling Rate, Input Voltage Range.
MAX128BCNG
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX127BENG
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1270BENG
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1274AETC+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX128BENG Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Number of Channels | 8 single-ended / 4 differential |
| Tỷ lệ lấy mẫu | 8 ksps |
| ADC Architecture | SAR (Successive Approximation Register) |
| Điện áp cung cấp | +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) |
| Nhiệt độ hoạt động | -40C to +85C (E suffix) |
| Hộp | 24-pin PDIP (DIP-24) |
| Kiểu lắp đặt | Through-Hole (THT) |
| Trạng thái RoHS | Compliant (G suffix - lead-free finish) |
| Data Interface | I2C serial, up to 8 devices per bus |
Cấu hình chân MAX128BENG
| Chân 1 | AIN0 — Analog Input Channel 0 |
| Chân 2 | AIN1 — Analog Input Channel 1 |
| Chân 3 | AIN2 — Analog Input Channel 2 |
| Chân 4 | AIN3 — Analog Input Channel 3 |
| Chân 5 | AIN4 — Analog Input Channel 4 |
| Chân 6 | AIN5 — Analog Input Channel 5 |
| Chân 7 | AIN6 — Analog Input Channel 6 |
| Chân 8 | AIN7 — Analog Input Channel 7 |
| Chân 9 | AGND — Analog Ground |
| Chân 10 | REF — Reference Voltage (4.096V internal) |
| Chân 11 | AVDD — Analog +5V Supply |
| Chân 12 | SHDN — Hardware Shutdown (active low) |
| Chân 13 | SDA — I2C Serial Data |
| Chân 14 | SCL — I2C Serial Clock |
| Chân 15 | AD0 — I2C Address Select (0x50 or 0x52) |
| Chân 16 | DGND — Digital Ground |
| Chân 17 | DVDD — Digital +5V Supply |
| Chân 18 | NC — Not connected |
| Chân 19 | NC — Not connected |
| Chân 20 | NC — Not connected |
| Chân 21 | NC — Not connected |
| Chân 22 | NC — Not connected |
| Chân 23 | NC — Not connected |
| Chân 24 | NC — Not connected |
Ứng dụng tiêu biểu
MAX128BENG phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX128BENG — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Extended industrial temperature range (vsMAX128BCNG)
- I2C address selection capability (vsMAX127BENG)
- Wider input voltage range (vsMAX1270BENG)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
