Overview
The AD538SD, produced by Analog Devices Inc., is a monolithic real-time computational circuit designed for precision analog multiplication, division, and exponentiation. This device is part of the AD538 series and is particularly suited for applications requiring high accuracy and wide dynamic range. The AD538SD features low input and output offset voltages, excellent linearity, and a bandwidth of 400 kHz, making it ideal for real-time analog signal processing. It is available in military-grade packaging, operating over a temperature range of -55°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | 18-Lead Side-Brazed Ceramic DIP | |
| Number of Pins | 18 | |
| Operating Supply Voltage | ±4.5 V to ±18 V | V |
| Operating Supply Current | 7 mA | mA |
| Bandwidth | 400 kHz | kHz |
| Max Input Voltage | 10 V | V |
| Temperature Range | -55°C to +125°C | °C |
| Error (100:1 Range) | ±0.25% of reading | % |
| Output Offset | <100 µV | µV |
| Slew Rate | 1.4 V/μs | V/μs |
Key Features
- Simultaneous multiplication and division capabilities
- Resistor-programmable powers and roots
- No external trims required
- Low input offsets (<100 µV) and low error (±0.25% of reading for 100:1 range)
- On-chip +2 V and +10 V references
- Monolithic construction for high reliability
- Wide power-supply range (±4.5 V to ±18 V)
- Access to multiple summing junctions for increased flexibility
- Exponentiation with an m value from 0.2 to 5 using external resistors
- Direct log ratio computation using log ratio and output sections
Applications
- One- or two-quadrant multiply/divide operations
- Log ratio computation
- Squaring/square rooting
- Trigonometric function approximations
- Linearization via curve fitting
- Precision AGC (Automatic Gain Control)
- RF cable systems
- Micro signal measurement
- Mobile phone and home/commercial audio systems
- Oscilloscopes and high-frequency data acquisition systems
- Cinema or auditorium audio systems
- Thermocouples and television systems
- Professional videography
Q & A
- What is the primary function of the AD538SD?
The AD538SD is a monolithic real-time computational circuit designed for precision analog multiplication, division, and exponentiation.
- What is the operating temperature range of the AD538SD?
The AD538SD operates over a temperature range of -55°C to +125°C.
- What is the bandwidth of the AD538SD?
The bandwidth of the AD538SD is 400 kHz.
- What are the typical output offsets of the AD538SD?
The typical output offsets are less than 100 µV.
- Can the AD538SD perform two-quadrant division?
Yes, two-quadrant division is possible with the use of external level shifting and scaling resistors.
- What are the on-chip voltage references available on the AD538SD?
The AD538SD has on-chip +2 V and +10 V references.
- What is the maximum error for multiplication and division over a 100:1 range?
The maximum error is ±0.25% of reading.
- How is the desired scale factor for multiplication and division set?
The desired scale factor can be set using the on-chip +2 V or +10 V references or controlled externally.
- Can the AD538SD perform exponentiation?
Yes, exponentiation with an m value from 0.2 to 5 can be implemented with the addition of one or two external resistors.
- What are some common applications of the AD538SD?
Common applications include one- or two-quadrant multiply/divide operations, log ratio computation, squaring/square rooting, and precision AGC, among others.
