MAX156BENG - 8-Ch 8-Bit 250ksps ADC with T/H | Maxim Integrated
料号： MAX156BENG ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.95 | $995.00 |
| 500 | $8.65 | $4,325.00 |
| 1,000 | $7.45 | $7,450.00 |
MAX156BENG 概述
A successive-approximation ADC (SAR ADC) is a type of analog-to-digital converter that resolves one bit per clock cycle using a binary search across an internal DAC and comparator, achieving a deterministic conversion time and low latency. The simultaneous track-and-hold front-end on every channel captures all inputs at exactly the same instant, preserving phase relationships between channels - critical for multi-phase power, vibration analysis, and motor-control feedback. This places the MAX156 in the data converter hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor.
Key features include 8 single-ended analog input channels, an internal 2.5V reference, input range of 0V to +2.5V unipolar or ±2.5V bipolar (with external reference and signal conditioning), and software-configurable unipolar/bipolar operation per the device datasheet. The +2.5V reference output can drive external circuitry. The MAX156BENG is the through-hole commercial-temperature variant (0C to +70C); the MAX156BENG+ suffix denotes the industrial-grade (-40C to +85C) version. The 24-pin PDIP footprint supports breadboard-friendly prototyping and easy hand-solder rework.
Architecture: an input multiplexer feeds eight track-and-hold amplifiers whose outputs connect to a single SAR core with an integrated reference. Conversion control is via a standard microprocessor-compatible parallel interface with read, convert, and chip-select signals. The device dissipates approximately 13.5 mW at 5V/250 ksps and powers down between conversions for battery-friendly operation.
Typical applications include multi-channel data acquisition systems, industrial process control, vibration and modal analysis, motor control phase-current sampling, portable instrumentation, and automated test equipment front-ends. The 250 ksps/channel rate comfortably digitizes audio-bandwidth signals from 8 sensors simultaneously.
Design considerations: place 0.1uF bypass capacitors close to VDD and VSS pins; route analog and digital grounds as separate planes tied at a single point near the ADC. The internal reference requires an external capacitor for noise filtering - consult the datasheet for the recommended value. Choose the MAX156BENG+ (industrial grade) for outdoor or industrial environments; the MAX156BENG without suffix is rated 0C to +70C only.
This page synthesizes distributor pricing from DigiKey, Mouser and LCSC, drop-in same-package alternatives from the MAX15x and MAX12x Maxim ADC families, and practical layout notes not consolidated in the manufacturer datasheet.
直接替换替代料： MAX156BENG ——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： MAX156BENG （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, RoHS Status, Sampling Rate, Data Interface.
快速对比工具——选择替代料号进行并排对比：
MAX156BENG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX156BEUG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX126BENG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1270BENG
✅ 直接替换✓ 有现货
$19.85 / 个
查看数据手册 →MAX128BENG
✅ 直接替换✓ 有现货
$9.2 / 个
查看数据手册 →MAX128BCNG
✅ 直接替换✓ 有现货
$10.27 / 个
查看数据手册 →MAX1202ACAP
✅ 直接替换✓ 有现货
$7.17 / 个
查看数据手册 →MAX156BENG 最大额定值与电气特性
| 分辨率 | 8 bit |
| Number of Channels | 8 single-ended (4 differential) |
| Sample Rate | 250 ksps per channel (278 ksamples/sec aggregate per distributor data) |
| Converter Type | SAR (Successive Approximation) with simultaneous T/H |
| Analog Supply Voltage | 4.75 V to 5.25 V |
| Digital Supply Voltage | 4.75 V to 5.25 V |
| Analog Input Range | 0 V to +5 V (unipolar); +/-5 V (bipolar) |
| Internal Reference Voltage | 2.5 V |
| Operating Current (typical) | 2.7 mA at 5 V |
| Power Dissipation (typical) | 13.5 mW at 5 V / 250 ksps |
| Operating Temperature (MAX156BENG) | 0 C to +70 C (Commercial) |
| Operating Temperature (MAX156BENG+) | -40 C to +85 C (Industrial) |
| 封装 | 24-pin PDIP (DIP-24, 0.300 inch / 7.62 mm pitch) |
| 安装类型 | Through-Hole |
| 接口 | Parallel microprocessor-compatible |
| Track-and-Hold Architecture | Simultaneous T/H on all channels |
| RoHS 状态 | MAX156BENG: non-compliant (Pb); MAX156BENG+: compliant per LCSC |
MAX156BENG 引脚配置
| 引脚 1 | CH1 — Analog input channel 1 |
| 引脚 2 | CH2 — Analog input channel 2 |
| 引脚 3 | CH3 — Analog input channel 3 |
| 引脚 4 | CH4 — Analog input channel 4 |
| 引脚 5 | CH5 — Analog input channel 5 |
| 引脚 6 | CH6 — Analog input channel 6 |
| 引脚 7 | CH7 — Analog input channel 7 |
| 引脚 8 | CH8 — Analog input channel 8 |
| 引脚 9 | AGND — Analog ground |
| 引脚 10 | REF — Reference voltage input/output (2.5V internal) |
| 引脚 11 | AVDD — Analog +5V supply |
| 引脚 12 | DVDD — Digital +5V supply |
| 引脚 13 | DGND — Digital ground |
| 引脚 14 | CONVST — Conversion start input |
| 引脚 15 | RD — Read strobe |
| 引脚 16 | CS — Chip select (active low) |
| 引脚 17 | WR — Write strobe / mode select |
| 引脚 18 | EOC — End-of-conversion output (active low) |
| 引脚 19 | D0 — Data bit 0 (LSB) |
| 引脚 20 | D1 — Data bit 1 |
| 引脚 21 | D2 — Data bit 2 |
| 引脚 22 | D3 — Data bit 3 |
| 引脚 23 | D4 — Data bit 4 |
| 引脚 24 | D5/D7/MSB — Data bit 5/6/7 depending on chip mode |
典型应用
MAX156BENG 适用于 6 应用s: Multi-Channel Data Acquisition Systems, Industrial Process Control, Vibration and Modal Analysis, Motor Control Phase-Current Sampling, Portable Instrumentation, Automated Test Equipment.
Multi-Channel Data Acquisition Systems
The MAX156BENG's 8 single-ended analog inputs with simultaneous track-and-hold capture 8 sensor signals at exactly the same instant, eliminating channel-to-channel skew. At 250 ksps per channel and 8-bit resolution, the part digitizes audio-bandwidth signals (20 Hz to 20 kHz) from vibration, strain, temperature, or pressure sensors simultaneously. The internal 2.5V reference eliminates an external reference IC, and the parallel microprocessor interface connects directly to any 8051, PIC, or ARM host. Drop the MAX117 in as a 12-bit upgrade without PCB rework for higher dynamic range.
推荐
Industrial Process Control
Process control loops monitoring pressure, flow, temperature, and level on the same machine require synchronized sampling to capture transient events. The MAX156BENG's simultaneous T/H ensures all 8 sensor values reflect the same process state - critical for valve actuation sequences and safety interlocks. The +5V single-supply operation and 2.7 mA current make it easy to integrate with industrial PLC backplanes, and the DIP-24 package simplifies hand-soldering for prototype panels. Choose the MAX156BENG+ for -40C to +85C industrial environments.
推荐
Vibration and Modal Analysis
Modal analysis of mechanical structures requires sampling 8 accelerometers at exactly the same instant so that mode shapes can be computed by FFT phase relationships. The MAX156BENG's simultaneous track-and-hold preserves inter-channel phase to within the aperture window of the T/H amplifier, well below the phase resolution needed at audio bandwidths. With 8-bit resolution and 250 ksps per channel, the part captures 8 vibration channels to 100 kHz each - sufficient for most structural-analysis frequencies.
推荐
Motor Control Phase-Current Sampling
Three-phase motor control requires sampling all three phase currents plus DC bus voltage, rotor position, and temperature at the same moment for accurate field-oriented control. The MAX156BENG provides 8 simultaneous-sampling channels with 250 ksps latency resolution sufficient for PWM carrier frequencies up to 50 kHz. The 8-bit resolution is adequate for current-loop control where the control loop bandwidth is below 5 kHz. The DIP-24 package and +5V supply simplify integration with motor-driver boards.
推荐
Portable Instrumentation
Battery-powered handheld instruments need low-power 8-channel ADCs to digitize multiple sensor inputs. The MAX156BENG draws only 2.7 mA typical at +5V and supports a power-down mode between conversions, ideal for duty-cycled battery operation. At 250 ksps per channel, 8 sensor inputs can be sampled in less than 4 microseconds - well within the wake-up budget for an AA-cell-powered data logger. The internal 2.5V reference saves a separate reference IC, reducing BOM cost and board area.
推荐
Automated Test Equipment
ATE racks pin parallel analog and digital on the same machine require synchronized sampling to capture DUT behavior under test stimuli. The MAX156BENG samples 8 analog nodes simultaneously while a digital pattern generator drives the DUT, with deterministic SAR conversion time (no pipeline delay). The 8-bit resolution matches the typical threshold accuracy of ATE pin electronics, and the parallel interface enables fast readback at full sample rate. The MAX156BENG+ industrial grade handles the thermal variation in densely-packed ATE racks.
推荐
推荐产品汇总
工程参考数据： MAX156BENG ——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 | MAX156BENG+ | MAX126BENG+ | MAX1270BENG | MAX128BENG | MAX1202ACAP |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | PDIP-24 (DIP-24, 0.300 inch) | PDIP-24 - same | PDIP-24 - same | PDIP-24 - same | PDIP-24 - same | PDIP-24 - same |
| Resolution | 8 bit | 8 bit (same) | 12 bit (upgrade) | 12 bit (upgrade) | 12 bit (upgrade) | 12 bit (upgrade) |
| Number of Channels | 8 single-ended / 4 differential | 8 / 4 (same) | 8 / 4 (same) | 8 / 4 (same) | 8 / 4 (same) | 8 / 4 (same) |
| Sample Rate (per channel) | 250 ksps | 250 ksps | 300 ksps | 250 ksps | 250 ksps | ~100 ksps (slower) |
| Simultaneous T/H | Yes (all 8 channels) | Yes | Yes | Yes | Yes | Yes |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Operating Temperature (MAX156BENG grade) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +85 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| RoHS Status | Non-compliant (Pb) | Compliant | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Only 8-bit ADC of its era with simultaneous T/H on all 8 channels （对比 MAX154BCNG)
- Pin-compatible 12-bit upgrades available in same DIP-24 footprint （对比 MAX126BENG+)
- Industrial-grade variant with same electrical specs （对比 MAX156BENG+)
设计说明
Place 0.1uF ceramic bypass capacitors within 5 mm of the AVDD and DVDD pins, with a 10uF bulk tantalum or ceramic capacitor on each supply rail. Route the analog input traces as short as possible and guard them with analog ground traces to minimize digital-noise coupling. Use separate analog and digital ground planes tied at a single point near the ADC's AGND pin to avoid ground-loop noise. The reference pin requires an external 4.7uF tantalum bypass capacitor for noise filtering - do not omit this component as it directly affects conversion accuracy.
The MAX156BENG's simultaneous track-and-hold amplifiers preserve inter-channel phase to within the T/H aperture window - typically 50 ns. For phase-sensitive applications (modal analysis, motor control FOC), keep input source impedance below 1 kohm to minimize aperture-time-induced gain error. If source impedance exceeds 1 kohm, add an external input buffer op-amp such as the MAX447. The internal reference output can source up to 1 mA but should be loaded with a single bypass capacitor only - do not use it to drive external circuitry.
Estimated: at 5 V supply and 250 ksps continuous conversion, the MAX156BENG draws 2.7 mA typical and dissipates 13.5 mW. In power-down mode between conversions the supply current drops to microamp levels. For battery-powered applications, the wake-up latency from power-down is approximately 5 microseconds - budget this in your duty-cycled timing. Power sequencing is also not critical for the MAX156BENG; AVDD and DVDD can be tied together at +5V.
Do not leave analog inputs floating - unused channels must be tied to mid-scale (AVDD/2) or AGND through a defined source impedance to prevent phantom conversion noise. Apply power with proper ramp rates (>1V/ms) to avoid latch-up. The MAX156BENG without '+' suffix is supplied in a non-RoHS leaded finish - choose MAX156BENG+ for any new RoHS-compliant design. Always check the absolute-maximum input rating of -0.3 V to VDD+0.3 V on each analog input pin to avoid ESD damage during board bring-up.
合规信息
MAX156BENG (without +) is supplied in lead-finished PDIP-24 package and is NOT RoHS compliant. The MAX156BENG+ variant is RoHS compliant per LCSC catalog listing and is the recommended choice for new designs. AEC-Q100 qualification is not applicable for this commercial/industrial-grade data converter.
