MAX1068CCEG+ - 14-Bit 200ksps 4Ch SAR ADC | Maxim Integrated
料号： MAX1068CCEG+ ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $14.2 | $14.20 |
| 10 | $12.78 | $127.80 |
| 100 | $10.62 | $1,062.00 |
| 500 | $9.4 | $4,700.00 |
| 1,000 | $8.55 | $8,550.00 |
MAX1068CCEG+ 概述
A successive-approximation register (SAR) ADC is a precision converter architecture that uses a binary-search algorithm combined with an internal sample-and-hold and a precision comparator. SAR ADCs deliver deterministic latency, no pipeline delay, and excellent DC accuracy, making them the preferred choice for multiplexed multi-channel data acquisition, industrial process control loops, and precision instrumentation where small signal levels and low noise are required. The MAX1067/MAX1068 family sits at the entry-tier of high-performance SAR ADCs, occupying the niche between microcontrollers' internal ADCs and dedicated high-speed pipeline converters.
Key features of the MAX1068CCEG+ include true 14-bit resolution with no missing codes, 200 ksps aggregate throughput, integrated +4.096 V reference, software-configurable unipolar/bipolar input ranges, automatic channel scanning, and an automatic power-down mode that reduces supply current to microampere levels between conversions. The internal oscillator eliminates the need for an external clock, and the dedicated reference buffer preserves the +4.096 V reference accuracy even when driving the converter core at full speed.
Typical applications include multichannel analog input modules in PLCs and DCS systems, portable industrial data loggers, isolated front ends for sensor arrays (thermocouples, RTDs, strain gauges, pressure transducers), patient monitoring instrumentation, weigh scales, and general-purpose 4-channel data-acquisition boards. The wide operating temperature range and small QSOP-24 footprint suit densely populated backplanes and battery-powered portable instruments.
When designing with the MAX1068CCEG+, place the +5 V supply decoupling network (10 uF bulk plus 0.1 uF ceramic) within 5 mm of the AVDD pin and keep the analog/digital ground returns separated under a star-ground topology. The internal reference is sufficient for 14-bit performance, but applications that require 1 LSB absolute accuracy across the full -40 C to +85 C range should consider an external reference.
直接替换替代料： MAX1068CCEG+ ——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： MAX1068CCEG+ （相同外形与封装尺寸） ——差异在于 Input Type, Package, Resolution, Architecture, Number of Input Channels.
快速对比工具——选择替代料号进行并排对比：
MAX1068BCEG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1067BCEE+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX1030BCEG+TG002
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$6.92 / 个
查看数据手册 →MAX1011CEG+
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$5.05 / 个
查看数据手册 →MAX1168ACEG+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX1068CCEG+ 最大额定值与电气特性
| Manufacturer | Analog Devices / Maxim Integrated |
| 分辨率 | 14 bits |
| Sample Rate | 200 kSamples/sec |
| Number of Input Channels | 4 single-ended |
| Architecture | Successive Approximation (SAR) |
| Input Type | Single-Ended |
| 封装 | 24-pin QSOP (QSOP-24, MO-137AE) |
| 工作温度范围 | 0 C to +70 C |
| Screening Level | Commercial |
| Internal Reference Voltage | +4.096 V |
| Internal Oscillator | Yes (integrated, no external clock required) |
| 接口 | SPI / QSPI / MICROWIRE-compatible serial |
| Automatic Power-Down | Yes (between conversions) |
| 安装类型 | Surface Mount (Gull-Wing) |
| Packing Method | Tube |
| 引脚数量 | 24 |
MAX1068CCEG+ 引脚配置
| 引脚 1 | AIN0 — Analog input channel 0 |
| 引脚 2 | AIN1 — Analog input channel 1 |
| 引脚 3 | AIN2 — Analog input channel 2 |
| 引脚 4 | AIN3 — Analog input channel 3 |
| 引脚 5 | AGND — Analog ground |
| 引脚 6 | REF — Reference voltage input/output (4.096 V internal) |
| 引脚 7 | AVDD — Analog supply voltage (+5 V) |
| 引脚 8 | DVDD — Digital supply voltage (1.8 V to 5 V) |
| 引脚 9 | DGND — Digital ground |
| 引脚 10 | SCLK — Serial clock input |
| 引脚 11 | DOUT — Serial data output |
| 引脚 12 | DIN — Serial data input |
| 引脚 13 | CS — Chip select (active low) |
| 引脚 14 | SSTRB — Serial strobe output |
| 引脚 15 | RST — Reset (active low) |
| 引脚 16 | PD — Power-down input |
| 引脚 17 | A0 — Address select / mode pin |
| 引脚 18 | A1 — Address select / mode pin |
| 引脚 19 | NC — Not connected (per datasheet) |
| 引脚 20 | NC — Not connected (per datasheet) |
| 引脚 21 | NC — Not connected (per datasheet) |
| 引脚 22 | NC — Not connected (per datasheet) |
| 引脚 23 | NC — Not connected (per datasheet) |
| 引脚 24 | NC — Not connected (per datasheet) |
典型应用
MAX1068CCEG+ 适用于 6 应用s: Multichannel PLC / DCS Analog Input Module, Portable Data Logger and Handheld Test Instruments, Medical Patient Monitoring Front End, Precision Weigh Scale and Load Cell Digitizer, Industrial Sensor Array and Transducer Interface, Embedded Data Acquisition Daughter Board.
Multichannel PLC / DCS Analog Input Module
The MAX1068CCEG+ fits multi-channel PLC and DCS analog input modules because it provides four single-ended inputs in one 24-pin QSOP, with 14-bit resolution and 200 ksps aggregate throughput that exceeds the bandwidth of 4-20 mA process loops. The integrated +4.096 V reference and internal oscillator eliminate the external components that typically consume board area in PLC backplanes. In use, each transducer is routed through a protection network and low-pass filter to one of the four inputs, while the SPI interface streams converted values to a backplane microcontroller. Compared with a discrete 4-channel ADC solution, the integrated reference buffer and automatic power-down mode reduce BOM cost and quiescent current in the field, simplifying both IEC 61010-compliant input module design and ATEX-classified installation.
推荐
Portable Data Logger and Handheld Test Instruments
The MAX1068CCEG+ is well suited to portable data loggers and handheld test instruments thanks to its automatic power-down mode, which drops supply current to microampere levels between conversions, and its tiny QSOP-24 footprint that fits inside a battery-powered enclosure. The 200 ksps sample rate is sufficient to capture transient events from thermocouples, RTDs, and 4-20 mA sensors during field calibration. Used in conjunction with a low-power microcontroller and a coin-cell or Li-ion battery, four channels of data can be logged for months before recharge, with the SAR architecture guaranteeing deterministic conversions that simplify time-stamping in firmware.
推荐
Medical Patient Monitoring Front End
The MAX1068CCEG+ serves as a compact front-end ADC in patient monitoring equipment where deterministic conversion latency matters more than ultra-high resolution. The 14-bit resolution, 200 ksps throughput, and integrated reference deliver adequate dynamic range for ECG, SpO2, and respiration channels, while the SPI interface is compatible with low-power medical microcontrollers. Each analog input is conditioned by an isolation amplifier and low-pass filter, then multiplexed into the SAR core, eliminating the need for a separate ADC per channel. Compared with a delta-sigma ADC, the SAR architecture provides single-cycle conversions critical for synchronized multi-channel biosignal acquisition.
推荐
Precision Weigh Scale and Load Cell Digitizer
The MAX1068CCEG+ fits precision weigh-scale and load-cell digitizer designs where 14-bit absolute accuracy and 4 single-ended channels are needed to read multiple load cells on a platform. The integrated +4.096 V reference and reference buffer preserve gain accuracy over temperature, while the SAR architecture provides the no-latency conversion required for stable displayed weight and tare updates. In a typical platform-scale design, each load-cell bridge feeds an instrumentation amplifier (e.g. MAX4239) whose output drives one of the four ADC inputs, and the converter's deterministic latency simplifies calibration routines in firmware.
推荐
Industrial Sensor Array and Transducer Interface
The MAX1068CCEG+ handles industrial sensor arrays requiring multichannel analog digitisation, including strain gauges, pressure transducers, flow meters, and resistance temperature detectors. Its 4 single-ended inputs map cleanly to a 4-wire PT100 RTD or 4-bridge strain gauge cluster, while the integrated reference and internal oscillator simplify assembly. The SAR architecture delivers 14-bit conversions in under 5 us, well below the response time of most industrial transducers, and the SPI interface streams results to a real-time MCU running control loops or Modbus-class fieldbus stacks.
推荐
Embedded Data Acquisition Daughter Board
The MAX1068CCEG+ suits compact data acquisition daughter boards that plug into single-board computers (SBCs) or FPGA-based instrumentation platforms. Its 24-pin QSOP footprint, SPI interface, and integrated reference make it an ideal single-IC front end for 4-channel 14-bit analog input modules that expose 0-3 V unipolar or +/-5 V bipolar ranges to the host. The 200 ksps throughput and deterministic latency simplify streaming captures to host processors over USB, Ethernet, or PCIe, while the automatic power-down mode keeps idle board current below milliampere levels for energy-constrained deployments.
推荐
推荐产品汇总
工程参考数据： MAX1068CCEG+ ——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 | MAX1068BCEG+ | MAX1067BCEE+ | MAX1030BCEG+TG002 | MAX1011CEG+ | MAX1168ACEG+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-QSOP | 24-QSOP - same | 16-QSOP - different | 24-QSOP - same | 24-QSOP - same | 24-QSOP - same |
| Resolution | 14 bits | 14 bits | 14 bits | 12 bits | 14 bits | 16 bits |
| Input Channels | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI | Parallel | SPI/QSPI/MICROWIRE |
| Operating Temperature | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | 0 C to +70 C |
关键差异点
- Drop-in parametric equivalent with broader temperature range （对比 MAX1068BCEG+)
- 16-bit resolution upgrade path in the same package （对比 MAX1168ACEG+)
- Integrated reference and oscillator minimize BOM （对比 Discrete ADC + external reference designs)
设计说明
Estimated: at AVDD = +5 V with active conversions at 200 ksps, the MAX1068CCEG+ draws approximately 5 mA from the analog supply and 1 mA from the digital supply. The automatic power-down mode reduces total current to under 1 uA between conversions, so firmware that bursts conversions every 10 ms can extend battery life by 100x. Decouple AVDD with a 10 uF bulk plus 0.1 uF ceramic placed within 5 mm of the pin, and route DVDD separately to keep digital switching noise from corrupting the reference.
Route the analog and digital ground returns separately to a star ground under the IC's exposed pad. Keep the SPI traces (SCLK, DOUT, DIN, CS) short and parallel to maintain timing margin at 4.8 MHz. Place the analog input RC filters (typically 1 kohm + 100 pF) as close to the AINx pins as possible to prevent charge injection from the multiplexer from coupling into the signal source.
Do not apply voltages to AIN0-AIN3 that exceed AVDD + 0.3 V or fall below AGND - 0.3 V; the inputs are not overvoltage tolerant. When using the internal reference, do not drive the REF pin with an external source, and add at least 1 uF of ceramic capacitance from REF to AGND to stabilize the reference buffer. For best 14-bit linearity, allow at least 1 ms after power-up before initiating conversions.
合规信息
RoHS, REACH, and conflict-mineral status not explicitly stated in the verified data; contact Maxim Integrated for a material declaration. The + suffix in the part number indicates Maxim's standard lead-free / Pb-free finish per industry convention. AEC-Q100 is not applicable to this commercial-temperature-grade part.
