Overview
The AD7845JN, produced by Analog Devices Inc., is a 12-bit multiplying digital-to-analog converter (DAC) that features a unique 4-quadrant multiplication capability and an integrated output amplifier. This device is fabricated using the LC2MOS process, allowing for the integration of precision linear components and digital circuitry on the same chip. The AD7845JN is designed to simplify microprocessor interfacing with its standard CS and WR signals controlling the latches, and it supports TTL and 5 V CMOS compatibility for digital inputs. The integrated output amplifier can supply ±10 V into a 2 kΩ load and is internally compensated, ensuring high accuracy and fast settling times.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 12 bits |
| Output Range | ±10 V into a 2 kΩ load |
| Supply Voltage | VDD: +12 V to +15 V, VSS: -12 V to +15 V |
| Application Resistors | RA = 4 RFB, RB = 2 RFB, RC = 2 RFB |
| Settling Time | |
| Slew Rate | |
| Input Offset Voltage | |
| Package Options | 24-lead DIP, 28-terminal LCC and PLCC, 24-terminal SOIC |
Key Features
- 4-quadrant multiplying capability
- Integrated output amplifier
- Matched application resistors for gain ranging and voltage offsetting
- Space-saving design with reduced chip count
- TTL and 5 V CMOS compatible digital inputs
- Internally compensated output amplifier
- Fast settling time and high slew rate
- Laser-trimmed input offset voltage for high accuracy
Applications
The AD7845JN is suitable for various applications requiring precise analog output control, such as industrial process control, medical devices, and automotive systems. Its 4-quadrant multiplication capability makes it particularly useful in scenarios where both positive and negative output voltages are necessary. Additionally, its integrated output amplifier and matched application resistors simplify the design and implementation of analog output stages.
Q & A
- What is the resolution of the AD7845JN DAC?
The AD7845JN has a resolution of 12 bits. - What is the output voltage range of the AD7845JN?
The output voltage range is ±10 V into a 2 kΩ load. - What are the supply voltage requirements for the AD7845JN?
The supply voltage requirements are VDD: +12 V to +15 V and VSS: -12 V to +15 V. - What are the application resistors provided on the AD7845JN?
The application resistors are RA = 4 RFB, RB = 2 RFB, and RC = 2 RFB. - How long does the AD7845JN take to settle to 0.01% FSR?
The settling time is less than 5 µs to 0.01% FSR (1/2 LSB). - What is the slew rate of the output amplifier in the AD7845JN?
The slew rate is typically 11 V/µs. - How is the input offset voltage of the AD7845JN adjusted?
The input offset voltage is laser trimmed at wafer level. - What package options are available for the AD7845JN?
The package options include 24-lead DIP, 28-terminal LCC and PLCC, and 24-terminal SOIC. - Is the AD7845JN compatible with TTL and CMOS digital inputs?
Yes, the AD7845JN is compatible with TTL and 5 V CMOS digital inputs. - What are some typical applications of the AD7845JN?
The AD7845JN is typically used in industrial process control, medical devices, and automotive systems.
