AD7890ANZ-10 - 8-Channel 12-Bit Serial DAS | Analog Devices
MPN: AD7890ANZ-10 ✓ نشطAD7890ANZ-10 نظرة عامة
A data acquisition system (DAS) is a complete signal chain that samples multiple analog signals, converts them to digital, and interfaces with a microcontroller or DSP. The AD7890 integrates the multiplexer, track/hold, ADC, and reference into a single IC, simplifying design and reducing board space compared to discrete implementations. It belongs to the family of serial data acquisition systems, which are essential in industrial automation, process control, and instrumentation.
Key features include a fast 12-bit ADC with 5.9 µs conversion time, eight single-ended analog input channels, and a serial interface compatible with SPI. The on-chip track/hold amplifier ensures accurate sampling of dynamic signals, while the internal 2.5 V reference eliminates the need for external reference circuitry. The multiplexer is independently accessible, allowing users to insert antialiasing filters or signal conditioning between the multiplexer and the ADC.
The AD7890 uses LC2MOS technology, combining low power consumption with high-speed performance. The serial interface supports high-speed data transfer, and the device can be configured for various input ranges (0-2.5 V, 0-4.096 V, ±10 V) depending on the variant. The 24-pin PDIP package is suitable for through-hole assembly, providing ease of prototyping and robust mechanical connection.
Typical applications include industrial process control, data logging, and multi-channel sensor monitoring. The AD7890ANZ-10 is ideal for systems requiring simultaneous sampling of multiple analog signals with 12-bit resolution and serial output for easy microcontroller interfacing.
When designing with this device, ensure proper decoupling of the 5 V supply and careful layout of the analog input traces to minimize noise. The independent multiplexer access allows flexible signal conditioning, but the track/hold acquisition time must be considered for accurate sampling of high-frequency signals.
بدائل مباشرة لـ AD7890ANZ-10 — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع AD7890ANZ-10 (نفس عامل الشكل والبصمة) — يختلف في Input Voltage Range, Number of Channels, Package, Reference Type, RoHS Status.
AD7890BNZ-10
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
AD7890AN-10
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
AD7890ANZ-10 الحدود القصوى والخصائص الكهربائية
| الدقة | 12 bits |
| Number of Channels | 8 single-ended |
| معدل أخذ العينات | 117 kSPS |
| Conversion Time | 5.9 µs |
| نطاق جهد الدخل | ±10 V |
| جهد التغذية | 5 V |
| الواجهة | SPI |
| Reference Type | Internal 2.5 V |
| نطاق درجة حرارة التشغيل | -40°C to +85°C |
| العلبة | 24-PDIP |
| نوع التركيب | Through Hole |
| Screening Level | Industrial |
| حالة RoHS | Compliant |
| Technology | LC2MOS |
| Product Category | Data Acquisition ADCs/DACs - Specialized |
تكوين أطراف AD7890ANZ-10
| دبوس 1 | VDD — Positive supply voltage (5 V) |
| دبوس 2 | VIN1 — Analog input channel 1 |
| دبوس 3 | VIN2 — Analog input channel 2 |
| دبوس 4 | VIN3 — Analog input channel 3 |
| دبوس 5 | VIN4 — Analog input channel 4 |
| دبوس 6 | VIN5 — Analog input channel 5 |
| دبوس 7 | VIN6 — Analog input channel 6 |
| دبوس 8 | VIN7 — Analog input channel 7 |
| دبوس 9 | VIN8 — Analog input channel 8 |
| دبوس 10 | AGND — Analog ground |
| دبوس 11 | REF IN/OUT — Reference input/output (2.5 V) |
| دبوس 12 | DGND — Digital ground |
| دبوس 13 | SCLK — Serial clock input |
| دبوس 14 | SDATA — Serial data output |
| دبوس 15 | CS — Chip select (active low) |
| دبوس 16 | CONVST — Conversion start input |
| دبوس 17 | EOC — End of conversion output |
| دبوس 18 | MUXOUT — Multiplexer output (for external conditioning) |
| دبوس 19 | MUXIN — Multiplexer input (from conditioning circuit) |
| دبوس 20 | A0 — Address input bit 0 |
| دبوس 21 | A1 — Address input bit 1 |
| دبوس 22 | A2 — Address input bit 2 |
| دبوس 23 | STBY — Standby control input |
| دبوس 24 | VDD — Positive supply voltage (5 V) |
التطبيقات النموذجية
AD7890ANZ-10 مناسب لـ 6 التطبيقs: Industrial Process Control, Data Logging Systems, Multi-Channel Sensor Monitoring, Test and Measurement Equipment, Automotive Test Systems, Medical Instrumentation.
Industrial Process Control
The AD7890ANZ-10 is ideal for industrial process control systems that monitor multiple analog signals such as temperature, pressure, and flow. Its 8-channel multiplexer allows sampling of up to eight sensors with a single ADC, reducing component count. The ±10 V input range accommodates standard industrial sensor outputs, and the 12-bit resolution provides adequate precision for control loops. The serial SPI interface simplifies connection to microcontrollers, enabling fast data transfer for real-time monitoring and control. The industrial temperature range (-40°C to +85°C) ensures reliable operation in harsh factory environments.
موصى به
Data Logging Systems
In data logging applications, the AD7890ANZ-10 captures multiple analog channels sequentially and converts them to digital for storage. Its 117 kSPS sampling rate allows logging of dynamic signals with reasonable fidelity. The on-chip track/hold amplifier ensures accurate sampling of varying inputs. The internal 2.5 V reference provides a stable conversion reference, eliminating external components. The serial interface enables easy interfacing with SD cards or wireless modules for remote logging. The low power consumption of LC2MOS technology is beneficial for battery-powered loggers, though the 5 V supply may require a regulator.
موصى به
Multi-Channel Sensor Monitoring
The AD7890ANZ-10 is well-suited for multi-channel sensor monitoring in applications like environmental monitoring or equipment health tracking. Its 8 single-ended inputs can connect to various sensors, including temperature, humidity, and vibration sensors. The ±10 V range supports sensors with bipolar outputs, such as accelerometers. The independent multiplexer access allows insertion of signal conditioning circuits, like filters or amplifiers, between the multiplexer and ADC. This flexibility enables tailored signal processing for each channel. The SPI interface allows a single microcontroller to read all channels sequentially, simplifying system design.
موصى به
Test and Measurement Equipment
The AD7890ANZ-10 is used in test and measurement equipment such as data acquisition cards and portable instruments. Its 12-bit resolution and 117 kSPS sampling rate provide adequate performance for many measurement tasks. The serial interface reduces pin count, allowing compact PCB designs. The ±10 V input range is compatible with common test signals. The industrial temperature range ensures stability in lab and field environments. The on-chip reference simplifies calibration, and the track/hold amplifier ensures accurate sampling of transient signals. This makes it a cost-effective choice for multi-channel measurement systems.
موصى به
Automotive Test Systems
In automotive test systems, the AD7890ANZ-10 can monitor multiple sensors such as throttle position, temperature, and pressure. Its 8-channel input allows simultaneous sampling of various engine parameters. The ±10 V range is compatible with many automotive sensors. The industrial temperature range (-40°C to +85°C) covers under-hood environments. The serial interface enables connection to automotive microcontrollers. However, for AEC-Q100 qualified parts, consider the AD7890-10Q variant if available. The through-hole PDIP package is suitable for prototyping and low-volume production.
موصى به
Medical Instrumentation
The AD7890ANZ-10 can be used in medical instrumentation for monitoring physiological signals such as ECG, EEG, and temperature. Its 8-channel input allows multiple biosignals to be digitized with a single ADC. The 12-bit resolution is sufficient for many diagnostic applications. The ±10 V input range may require signal conditioning to match biosignal amplitudes. The serial interface simplifies isolation barriers. The low power consumption is beneficial for portable devices. However, for medical-grade compliance, additional certifications may be required. The through-hole package is suitable for prototyping medical devices.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ AD7890ANZ-10 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | AD7890BNZ-10 | AD7890ARZ-10 | AD7890AN-10 |
|---|---|---|---|---|
| Package | 24-PDIP | 24-PDIP | 24-SOIC | 24-PDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 117 kSPS | 117 kSPS | 117 kSPS | 117 kSPS |
| Input Voltage Range | ±10 V | ±10 V | ±10 V | ±10 V |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
| Interface | SPI | SPI | SPI | SPI |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
أبرز الفروقات
- Independent multiplexer access (مقابلAD7890BNZ-10)
- Through-hole PDIP package (مقابلAD7890ARZ-10)
- Wide ±10 V input range (مقابلAD7890AN-10)
ملاحظات التصميم
The AD7890ANZ-10 requires a single 5 V supply. Decouple the VDD pin with a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor placed as close to the pin as possible. The analog and digital grounds should be connected at a single point to minimize noise. Ensure the supply is clean and stable, as noise on VDD can affect conversion accuracy.
For optimal performance, route analog input traces away from digital signals and keep them short. Use a ground plane to provide a low-impedance return path. Place the reference decoupling capacitor (0.1 µF) close to the REF IN/OUT pin. If using the independent multiplexer access, ensure the signal conditioning circuit is properly shielded to avoid crosstalk.
Do not exceed the absolute maximum ratings for input voltage, which are typically ±15 V for the analog inputs. Ensure the CONVST signal is properly timed to meet the acquisition time requirements. The track/hold amplifier requires a minimum acquisition time; if the input signal changes rapidly, the conversion may be inaccurate. Also, avoid floating unused analog inputs; tie them to AGND or a known potential.
معلومات الامتثال
RoHS compliance confirmed by distributor listings. AEC-Q100 not applicable as this is not an automotive-grade part.
