AD674BTE/883B - 12-Bit SAR ADC, 28-CDIP | Analog Devices
MPN: AD674BTE/883B ✓ Hoạt độngAD674BTE/883B Tóm tắt
An analog-to-digital converter (ADC) is an electronic component that converts a continuous analog voltage into a discrete digital representation. The AD674BTE/883B is a successive approximation register (SAR) ADC, which uses a binary search algorithm to determine the digital output. SAR ADCs are known for their high speed and moderate resolution, making them ideal for industrial control, instrumentation, and data acquisition. The AD674B family is pin-compatible with the industry-standard AD574A but offers faster conversion time and lower power consumption.
Key features of the AD674BTE/883B include 12-bit resolution, a maximum conversion time of 15 µs, and an internal 10V reference. It accepts bipolar input ranges of ±5V and ±10V, as well as unipolar 0V to 10V and 0V to 20V, selectable via pin strapping. The device includes a three-state output buffer for direct bus interfacing and operates over the extended temperature range of -55°C to +125°C, meeting MIL-STD-883B standards.
Technically, the AD674BTE/883B integrates a precision voltage reference, clock, and comparator on-chip, reducing external component count. The SAR architecture ensures monotonicity and no missing codes over the full temperature range. The device features a 12-bit parallel output with a status pin (STS) that indicates conversion completion, simplifying microprocessor handshaking. The 28-pin CDIP package provides excellent thermal and mechanical stability for harsh environments.
Typical applications include military and aerospace data acquisition, industrial process control, medical instrumentation, and scientific analysis equipment. The device's wide operating temperature range and high reliability make it suitable for mission-critical systems where accuracy and durability are paramount.
When designing with the AD674BTE/883B, ensure proper decoupling of the power supplies and a clean analog ground plane to minimize noise. The internal reference can be overridden by an external reference for improved accuracy, but the internal reference is sufficient for most applications. The conversion start (CE, CS, R/C) control pins allow flexible timing, and the STS pin can be used to trigger interrupts or polling routines.
Bộ thay thế dễ dàng lắp đặt cho AD674BTE/883B — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
AD674BKNZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD774BTH
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD574AJD
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MX574ASE/883B
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC774TH-BI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD674BTE/883B Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit |
| Number of Inputs | 2 |
| Input Type | Single Ended |
| Architecture | SAR |
| Conversion Time | 15 µs (max) |
| Analog Input Ranges | 0V to 10V, 0V to 20V, ±5V, ±10V |
| Reference Type | Internal, External |
| Internal Reference Voltage | 10V |
| Data Interface | Parallel |
| Kiểu đầu ra | Three-state |
| Điện áp cung cấp | +5V, ±12V |
| Khoảng nhiệt độ hoạt động | -55°C to +125°C |
| Hộp | 28-CDIP |
| Kiểu lắp đặt | Through Hole |
| Trạng thái RoHS | Non-compliant |
Cấu hình chân AD674BTE/883B
| Chân 1 | VLOGIC — Logic supply voltage (5V) |
| Chân 2 | 12/8 — Data format select (12-bit or 8-bit) |
| Chân 3 | CS — Chip select (active low) |
| Chân 4 | A0 — Byte select / address input |
| Chân 5 | R/C — Read/Convert select |
| Chân 6 | CE — Chip enable (active high) |
| Chân 7 | VCC — Positive supply (+12V) |
| Chân 8 | REF OUT — Reference output (10V) |
| Chân 9 | AGND — Analog ground |
| Chân 10 | REF IN — Reference input |
| Chân 11 | VEE — Negative supply (-12V) |
| Chân 12 | BIP OFF — Bipolar offset |
| Chân 13 | 10V IN — Analog input (10V range) |
| Chân 14 | 20V IN — Analog input (20V range) |
| Chân 15 | DGND — Digital ground |
| Chân 16 | DB0 — Data bit 0 (LSB) |
| Chân 17 | DB1 — Data bit 1 |
| Chân 18 | DB2 — Data bit 2 |
| Chân 19 | DB3 — Data bit 3 |
| Chân 20 | DB4 — Data bit 4 |
| Chân 21 | DB5 — Data bit 5 |
| Chân 22 | DB6 — Data bit 6 |
| Chân 23 | DB7 — Data bit 7 |
| Chân 24 | DB8 — Data bit 8 |
| Chân 25 | DB9 — Data bit 9 |
| Chân 26 | DB10 — Data bit 10 |
| Chân 27 | DB11 — Data bit 11 (MSB) |
| Chân 28 | STS — Status output (conversion complete) |
Ứng dụng tiêu biểu
AD674BTE/883B phù hợp cho 6 Áp dụngs: Military Data Acquisition, Industrial Process Control, Medical Instrumentation, Scientific Analysis Equipment, Aerospace Test Systems, Automotive Test Equipment.
Military Data Acquisition
The AD674BTE/883B is ideal for military data acquisition systems due to its 12-bit resolution, 15 µs conversion time, and extended temperature range of -55°C to +125°C. Its ceramic CDIP package ensures reliability in harsh environments, and the internal reference simplifies design. The parallel interface allows direct connection to microprocessors, enabling rapid data logging in avionics and radar systems. The device's MIL-STD-883B compliance guarantees performance under extreme conditions, making it a trusted choice for defense applications.
Được đề xuất
Industrial Process Control
In industrial process control, the AD674BTE/883B provides accurate 12-bit conversion of sensor signals such as temperature, pressure, and flow. Its unipolar and bipolar input ranges (0-10V, ±5V, etc.) accommodate various transducer outputs. The 15 µs conversion time enables real-time monitoring and control loops. The device's robust design and wide temperature range make it suitable for factory automation and power plant monitoring, where reliability is critical. The parallel output simplifies interfacing with PLCs and microcontrollers.
Được đề xuất
Medical Instrumentation
The AD674BTE/883B is used in medical instrumentation such as patient monitors and diagnostic equipment, where accurate analog-to-digital conversion is essential. Its 12-bit resolution provides sufficient precision for vital sign monitoring, and the fast conversion time supports real-time data acquisition. The device's wide temperature range ensures stable operation in clinical environments. The internal reference reduces external component count, saving board space in compact medical devices. The parallel interface allows easy integration with digital signal processors.
Được đề xuất
Scientific Analysis Equipment
In scientific analysis equipment like spectrometers and chromatographs, the AD674BTE/883B delivers reliable 12-bit conversion of analog signals. Its low noise and monotonicity ensure accurate measurements, while the 15 µs conversion time allows high-throughput data collection. The device's military-grade temperature range makes it suitable for laboratory environments with varying conditions. The internal reference provides a stable voltage for consistent results. The parallel output facilitates high-speed data transfer to analysis software.
Được đề xuất
Aerospace Test Systems
The AD674BTE/883B is employed in aerospace test systems for monitoring and recording flight data. Its 12-bit resolution and 15 µs conversion time capture dynamic signals accurately. The device operates over -55°C to +125°C, withstanding the extreme temperatures of aerospace environments. The ceramic package provides mechanical robustness against vibration and shock. The parallel interface enables direct connection to flight computers, and the internal reference ensures stable operation without external components, reducing system complexity.
Được đề xuất
Automotive Test Equipment
In automotive test equipment, the AD674BTE/883B is used for engine control unit (ECU) testing and sensor validation. Its 12-bit resolution and fast conversion time allow accurate measurement of voltage and current signals. The device's wide temperature range (-55°C to +125°C) suits under-hood and test chamber environments. The parallel interface simplifies integration with test benches, and the internal reference reduces external parts. The device's reliability ensures consistent performance in demanding automotive testing applications.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD674BTE/883B — 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 | AD674BKNZ | AD774BTH | MX574ASE/883B |
|---|---|---|---|---|
| Package | 28-CDIP | 28-PDIP | 28-CDIP | 28-CDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Maxim Integrated |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit |
| Conversion Time | 15 µs | 15 µs | 8 µs | 15 µs |
| Temperature Range | -55°C to +125°C | 0°C to +70°C | -55°C to +125°C | -55°C to +125°C |
| RoHS | Non-compliant | Compliant | Non-compliant | Non-compliant |
| Internal Reference | Yes (10V) | Yes (10V) | Yes (10V) | Yes (10V) |
| Input Ranges | 0-10V, 0-20V, ±5V, ±10V | 0-10V, 0-20V, ±5V, ±10V | 0-10V, 0-20V, ±5V, ±10V | 0-10V, 0-20V, ±5V, ±10V |
Bảo phân biệt quan trọng
- Military-grade temperature range (vsAD674BKNZ)
- Faster conversion than industry standard (vsAD574AJD)
- Ceramic package for harsh environments (vsAD674BKNZ)
Ghi chú thiết kế
The AD674BTE/883B requires three power supplies: +5V for logic, +12V for analog positive, and -12V for analog negative. Decouple each supply with 10 µF tantalum and 0.1 µF ceramic capacitors placed close to the device pins. The analog and digital grounds should be connected at a single point to minimize noise coupling. Ensure the +5V logic supply is stable, as it powers the output buffers.
For optimal performance, use a ground plane and separate analog and digital ground areas, connecting them at the ADC. Place the input signal source close to the analog input pins to reduce parasitic capacitance. Keep the reference output (REF OUT) and reference input (REF IN) traces short and shielded to avoid noise pickup. Bypass the reference pins with 0.1 µF ceramic capacitors.
A common mistake is leaving the BIP OFF pin unconnected when using unipolar input ranges. For unipolar operation, connect BIP OFF to AGND; for bipolar, leave it open. Also, ensure the 12/8 pin is set correctly for the desired data format (12-bit or 8-bit). Incorrect setting can cause data misalignment. Always verify the conversion status via the STS pin before reading data to avoid reading invalid outputs.
Thông tin tuân thủ
Military-grade device, not RoHS compliant due to lead-based solder in ceramic package.
