MAX1068CCEG+ - 14-Bit 200ksps 4Ch SAR ADC | Maxim Integrated
MPN: MAX1068CCEG+ ✗ Cuối đờiMAX1068CCEG+ Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MAX1068CCEG+ — 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 MAX1068CCEG+ (cùng hình factor và footprint) — khác nhau ở Input Type, Package, Resolution, Architecture, Number of Input Channels.
MAX1068BCEG+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1067BCEE+
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX1030BCEG+TG002
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX1011CEG+
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX1168ACEG+
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX1068CCEG+ Tỷ lệ tối đa & tính chất điện
| Manufacturer | Analog Devices / Maxim Integrated |
| Độ phân giải | 14 bits |
| Sample Rate | 200 kSamples/sec |
| Number of Input Channels | 4 single-ended |
| Architecture | Successive Approximation (SAR) |
| Input Type | Single-Ended |
| Hộp | 24-pin QSOP (QSOP-24, MO-137AE) |
| Khoảng nhiệt độ hoạt động | 0 C to +70 C |
| Screening Level | Commercial |
| Internal Reference Voltage | +4.096 V |
| Internal Oscillator | Yes (integrated, no external clock required) |
| Giao diện | SPI / QSPI / MICROWIRE-compatible serial |
| Automatic Power-Down | Yes (between conversions) |
| Kiểu lắp đặt | Surface Mount (Gull-Wing) |
| Packing Method | Tube |
| Số chân | 24 |
Cấu hình chân MAX1068CCEG+
| 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 | AGND — Analog ground |
| Chân 6 | REF — Reference voltage input/output (4.096 V internal) |
| Chân 7 | AVDD — Analog supply voltage (+5 V) |
| Chân 8 | DVDD — Digital supply voltage (1.8 V to 5 V) |
| Chân 9 | DGND — Digital ground |
| Chân 10 | SCLK — Serial clock input |
| Chân 11 | DOUT — Serial data output |
| Chân 12 | DIN — Serial data input |
| Chân 13 | CS — Chip select (active low) |
| Chân 14 | SSTRB — Serial strobe output |
| Chân 15 | RST — Reset (active low) |
| Chân 16 | PD — Power-down input |
| Chân 17 | A0 — Address select / mode pin |
| Chân 18 | A1 — Address select / mode pin |
| Chân 19 | NC — Not connected (per datasheet) |
| Chân 20 | NC — Not connected (per datasheet) |
| Chân 21 | NC — Not connected (per datasheet) |
| Chân 22 | NC — Not connected (per datasheet) |
| Chân 23 | NC — Not connected (per datasheet) |
| Chân 24 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
MAX1068CCEG+ phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX1068CCEG+ — 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 | 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 |
Bảo phân biệt quan trọng
- Drop-in parametric equivalent with broader temperature range (vsMAX1068BCEG+)
- 16-bit resolution upgrade path in the same package (vsMAX1168ACEG+)
- Integrated reference and oscillator minimize BOM (vsDiscrete ADC + external reference designs)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
