AD8628ARZ-REEL7 - 2.5MHz Zero-Drift Op Amp | Analog Devices
MPN: AD8628ARZ-REEL7 ✓ Hoạt độngAD8628ARZ-REEL7 Tóm tắt
A zero-drift (auto-zero/chopper) amplifier is an op amp that continuously corrects its input offset voltage using an internal switching technique. In the broader hierarchy, the AD8628 is an auto-zero amplifier, which is a subset of zero-drift amplifiers, which are a class of precision operational amplifiers inside the larger analog amplifier ecosystem. This topology achieves offset voltages in the microvolt range without external nulling components.
Key features include a maximum input offset voltage of 1µV, maximum input bias current of 30pA, and rail-to-rail input/output behavior. The 2.5MHz bandwidth and 1V/µs slew rate support data acquisition and sensor signals while the ultra-low offset removes the need for system calibration in many dc-accurate circuits. The AD8628 also greatly reduces the digital switching noise found in many chopper-stabilized designs, according to the Analog Devices datasheet.
The architecture uses a charge-balancing auto-zero principle. Analog Devices states that the amplifier provides benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. No external capacitor is required for the nulling function. This simplifies PCB layout and reduces BOM cost. The 2.7V to 5V supply range makes it compatible with 3.3V and 5V ADCs, microcontrollers, and sensor front ends.
Typical applications include industrial sensor signal conditioning, load cell and weighing scale front ends, medical instrumentation like ECG and glucose monitors, battery-powered portable devices, and ADC driver stages for high-resolution SAR or delta-sigma converters. The AD8628ARZ-REEL7 is the 7-inch tape-and-reel version of the AD8628ARZ for high-volume assembly.
Designers should ensure clean supply bypassing and, because auto-zero amplifiers use an internal clock, keep high-impedance input traces away from digital noise sources. The rail-to-rail output allows direct interface to many ADCs without an additional level-shifting stage.
Bộ thay thế dễ dàng lắp đặt cho AD8628ARZ-REEL7 — 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 AD8628ARZ-REEL7 (cùng hình factor và footprint) — khác nhau ở Supply Voltage Range, Number of Channels, Amplifier Type, Gain Bandwidth Product, Input Bias Current.
AD8628WARZ-R7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADA4522-1ARZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →OPA388AIDR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MCP6V11-E/SN
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX4238ASA+T
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD8628ARZ-REEL7 Tỷ lệ tối đa & tính chất điện
| Amplifier Type | Zero-Drift / Auto-Zero / Chopper |
| Number of Channels | 1 |
| Gain Bandwidth Product | 2.5 MHz |
| Slew Rate | 1 V/µs |
| Input Offset Voltage (max) | 1 µV |
| Input Bias Current (max) | 30 pA |
| Supply Voltage Range | 2.7 V to 5 V |
| Input Type | Rail-to-Rail |
| Kiểu đầu ra | Rail-to-Rail |
| Hộp / Vỏ | 8-SOIC (SOIC-8) |
| Kiểu lắp đặt | Surface Mount |
Hướng dẫn cấu hình chân AD8628ARZ-REEL7 8-soic (soic-8)
Cấu hình chân cho AD8628ARZ-REEL7 (8-soic (soic-8) gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho AD8628ARZ-REEL7.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
AD8628ARZ-REEL7 phù hợp cho 6 Áp dụngs: Industrial Sensor Signal Conditioning, Weight Scale and Load Cell Front End, Medical and Biomedical Amplification, Battery-Powered Portable Instrumentation, ADC Driver for High-Resolution Data Acquisition, Portable Temperature Transmitter / IoT Sensor.
Industrial Sensor Signal Conditioning
The AD8628ARZ-REEL7 is ideal for pressure, strain, and thermocouple signal conditioning because of its 1µV offset and 30pA input bias current. In a typical bridge amplifier, the rail-to-rail output can swing close to the ADC full-scale range. Placed between a sensor bridge and a 24-bit delta-sigma ADC, the amplifier provides dc-accurate gain without adding input offset errors or requiring an external nulling capacitor. The 2.7V to 5V supply range is compatible with both 3.3V and 5V industrial sensor modules.
Được đề xuất
Weight Scale and Load Cell Front End
A load cell outputs millivolt-level signals that demand low offset and low drift over temperature. The AD8628's maximum 1µV offset voltage and auto-zero architecture keep the amplified bridge signal stable, while the 2.5MHz gain-bandwidth product is more than sufficient for dc load-cell measurements. The rail-to-rail output allows a direct interface to a high-resolution ADC such as the AD7799BRUZ without extra gain stages. This makes the AD8628ARZ-REEL7 a dependable building block for bench scales, platform scales, and force measurement systems.
Được đề xuất
Medical and Biomedical Amplification
For ECG, glucose monitors, and other biomedical front ends, the AD8628ARZ-REEL7 provides the low bias current, low offset, and rail-to-rail performance needed to preserve weak biological signals. The 30pA input bias current minimizes loading on high-impedance electrodes, and the 2.7V minimum supply accommodates 3V battery-powered medical devices. When used ahead of a precision ADC, the amplifier reduces baseline wander and calibration overhead. The auto-zero topology also lowers 1/f noise, which is critical for low-frequency biomedical measurements.
Được đề xuất
Battery-Powered Portable Instrumentation
The AD8628ARZ-REEL7 operates from a 2.7V to 5V supply, making it well suited for 3V lithium and 5V USB-powered portable instruments. Its rail-to-rail input/output maximizes dynamic range while the 1µV offset and 30pA bias preserve measurement accuracy without frequent calibration. Because no external nulling capacitor is required, the bill of materials stays low and the PCB layout is simplified. The 2.5MHz bandwidth also supports moderate-speed sensor sampling in handheld data loggers and field calibrators.
Được đề xuất
ADC Driver for High-Resolution Data Acquisition
Precision SAR and delta-sigma ADCs require low-offset, low-drift drivers to avoid degrading converter accuracy. The AD8628ARZ-REEL7's 1µV offset and 30pA bias are negligible at 16- to 24-bit resolution, while the rail-to-rail output can drive the ADC input without clipping near the supply rails. The 2.5MHz gain-bandwidth product supports sampling rates up to tens of kilo-samples per second when used as a unity-gain buffer. Placing a small RC filter between the op amp and ADC input reduces sampled noise and improves overall ENOB.
Được đề xuất
Portable Temperature Transmitter / IoT Sensor
In IoT temperature transmitters, the AD8628ARZ-REEL7 provides stable amplification for thermocouples, RTDs, or diode temperature sensors. Its zero-drift performance reduces measurement error across the -40°C to +125°C operating range, and the rail-to-rail output directly feeds typical microcontroller ADCs. Combined with a low-power temperature sensor and a precision ADC, this op amp can form a highly accurate, battery-friendly sensing node. The small SOIC-8 package also makes it practical for compact wireless sensor modules.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD8628ARZ-REEL7 — 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 | AD8628WARZ-R7 | ADA4522-1ARZ | OPA388AIDR | MCP6V11-E/SN |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Microchip Technology |
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Amplifier Type | Zero-Drift / Auto-Zero | Zero-Drift / Auto-Zero | Zero-Drift / Auto-Zero | Zero-Drift / Auto-Zero | Zero-Drift / Auto-Zero |
| Number of Channels | 1 | 1 | 1 | 1 | 1 |
| AEC-Q100 Qualification | No | Yes | No | No | No |
Bảo phân biệt quan trọng
- AEC-Q100 grade is available without a footprint change (vsAD8628WARZ-R7)
- Low 2.7V minimum supply and 30pA bias (vsOPA388AIDR)
- Auto-zero topology with no external nulling capacitor (vsMCP6V11-E/SN)
Ghi chú thiết kế
Place 0.1µF and 10µF bypass capacitors close to the V+ and V- supply pins. Keep feedback resistor traces short and route high-impedance input traces away from the internal auto-zero clock and digital logic. A small RC filter at the output can reduce chopper residue when driving an ADC.
Because this is an auto-zero/chopper amplifier, the internal switching clock can couple into high-impedance nodes. Do not run noisy digital traces beneath the input pins. If the application is dc or low-frequency, add a low-pass filter at the output to suppress chopper artifacts.
The AD8628ARZ-REEL7 is specified for 2.7V to 5V supply. Thermal stress is usually not critical for low quiescent current, but when driving a 30mA load from the 5V rail, calculate power dissipation using (V+ - Vout) * Iload. Keep the junction temperature within the datasheet limit by providing adequate copper area on the SOIC-8 PCB footprint.
Thông tin tuân thủ
RoHS/AEC-Q100 status was not explicitly confirmed in the verified web snippets. The Z suffix in the part number typically indicates a lead-free/RoHS version, but this should be verified against the manufacturer datasheet before compliance certification.
