AD538SD: Real-Time Analog Computational Unit (ACU)
The AD538 is a monolithic real-time computational circuit which provides precision analog multiplication, division, and exponentiation. The combination of low input and output offset voltages and excellent linearity results in accurate computation over an unusually wide input dynamic range. Laser wafer trimming makes multiplication and division with errors as low as 0.25% of reading possible, while typical output offsets of 100 microV or less add to the overall off-the-shelf performance level. Real-time analog signal processing is further enhanced by the device's 400 kHz bandwidth.
The AD538's overall transfer function is Vo=Vy(Vz/Vx)m. Programming a particular function is via pin strapping. No external components are required for one-quadrant (positive input) multiplication and division. Two-quadrant (bipolar numerator) division is possible with the use of external level shifting and scaling resistors. The desired scale factor for both multiplication and division can be set using the on-chip +2 V or +10 V references, or controlled externally to provide simultaneous multiplication and division. Exponentiation with an M value from 0.2 to 5 can be implemented with the addition of one or two external resistors.
Direct log ratio computation is possible by utilizing only the log ratio and output sections of the chip. Access to the multiple summing junctions adds further to the AD538's flexibility. Finally, a wide power-supply range of ±4.5 V to ±18 V allows operation from standard ±5 V, ± 12 V and ± 15 V supplies.
The AD538 is available in two accuracy grades (A and B) over the industrial (-25°C to +85°C) temperature range and one grade (S) over the military (-55°C to +125°C) temperature range. The device is packaged in an 18-pin TO-118 hermetic size-brazed ceramic DIP. A-grade chips are also available.
AD538SD 特点
- VOUT = VY (VZ divided by VX)m Transfer Function
- Wide Dynamic Range (Denominator) -1000:1
- Simultaneous Multiplication and Division
- Resistor-Programmable Powers and Roots
- No External Trims Required
- Low Input Offsets <100 uV
- Low Error ±0.25% of Reading (100:1 Range)
- +2 V and +10 V On-Chip References
- Monolithic Construction
AD538SD 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD538AD | 量产 | 14 ld Bottom-Brazed CerDIP | 18 | 工业 |
| AD538ADZ | 量产 | 18 ld CerDip | 18 | 工业 |
| AD538BD | 量产 | 18 ld CerDip | 18 | 工业 |
| AD538BDZ | 量产 | 18 ld CerDip | 18 | 工业 |
| AD538SD | 量产 | 18 ld Side-Brazed CerDIP | 18 | 军用 |
| AD538SD/883B | 量产 | 18 ld Side-Brazed CerDIP | 18 | 军用 |
AD538SD 应用技术支持与电子电路设计开发资源下载
- AD538 数据手册DataSheet 下载 . PDF
- ADI 模拟器件公司比较器产品选型指南 . PDF
- Analog Devices, Inc. 美国模拟器件公司产品订购手册 .PDF