Overview
The AD538BDZ is a monolithic real-time analog computational unit (ACU) produced by Analog Devices Inc. This device is designed to provide precision analog multiplication, division, and exponentiation. It features low input and output offset voltages and excellent linearity, enabling accurate computation over a wide input dynamic range. The AD538BDZ is particularly notable for its ability to perform these computations in real-time, enhanced by a 400 kHz bandwidth.
The device is available in various accuracy grades, including A and B for industrial temperature ranges (-25°C to +85°C) and S for military temperature ranges (-55°C to +125°C). It is packaged in an 18-lead TO-118 hermetic side-brazed ceramic DIP.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Bandwidth | Frequency response | 400 kHz |
| Input Offset Voltage | Typical output offsets | < 100 μV |
| Error Specification | For multiplication and division (100:1 range) | ±0.25% of reading |
| On-Chip References | Voltage values | +2 V, +10 V |
| Power Supply Range | Operating voltage range | ±4.5 V to ±18 V |
| Temperature Range | Industrial and military grades | -25°C to +85°C (A, B grades), -55°C to +125°C (S grade) |
| Package Type | Physical packaging | 18-lead TO-118 hermetic side-brazed ceramic DIP |
Key Features
- Precision Analog Computation: Provides accurate analog multiplication, division, and exponentiation.
- Low Input and Output Offsets: Typical output offsets of less than 100 μV.
- Wide Dynamic Range: Supports a dynamic range of up to 1000:1.
- No External Trims Required: For one-quadrant multiplication and division.
- On-Chip References: +2 V and +10 V references available.
- Resistor-Programmable Powers and Roots: Allows for exponentiation with external resistors.
- Multiple Summing Junctions: Adds to the device's flexibility.
Applications
- One- or Two-Quadrant Multiply/Divide: Supports both positive and bipolar inputs.
- Log Ratio Computation: Direct log ratio computation possible using the log ratio and output sections.
- Squaring/Square Rooting: Can be implemented using the device's computational capabilities.
- Trigonometric Function Approximations: Enables the approximation of trigonometric functions.
- Linearization via Curve Fitting: Useful for linearizing non-linear relationships.
- Precision AGC (Automatic Gain Control): Suitable for precision gain control applications.
- Power Functions: Supports various power functions with the use of external resistors.
Q & A
- What is the primary function of the AD538BDZ?
The AD538BDZ is a real-time analog computational unit that provides precision analog multiplication, division, and exponentiation.
- What is the bandwidth of the AD538BDZ?
The device has a bandwidth of 400 kHz.
- What are the typical output offsets of the AD538BDZ?
The typical output offsets are less than 100 μV.
- What is the error specification for multiplication and division over a 100:1 range?
The error specification is ±0.25% of reading.
- What on-chip references are available on the AD538BDZ?
The device includes +2 V and +10 V on-chip references.
- What is the power supply range for the AD538BDZ?
The device operates from ±4.5 V to ±18 V.
- What are the temperature ranges for the different accuracy grades of the AD538BDZ?
The industrial grades (A and B) operate from -25°C to +85°C, while the military grade (S) operates from -55°C to +125°C.
- What type of package does the AD538BDZ come in?
The device is packaged in an 18-lead TO-118 hermetic side-brazed ceramic DIP.
- Can the AD538BDZ perform log ratio computations?
Yes, direct log ratio computation is possible using the log ratio and output sections of the chip.
- What are some common applications of the AD538BDZ?
Common applications include one- or two-quadrant multiply/divide, log ratio computation, squaring/square rooting, trigonometric function approximations, linearization via curve fitting, precision AGC, and power functions.
