Overview
The AD7845KR-REEL, produced by Analog Devices Inc., is a 12-bit multiplying Digital-to-Analog Converter (DAC) that features an integrated output amplifier. This device is notable for its 4-quadrant multiplying capability, making it versatile for various applications. Fabricated using the LC2MOS process, it combines precision linear components and digital circuitry on a single chip. The AD7845KR-REEL is housed in a 24-lead SOIC package, which helps in reducing the overall chip count and saving space in designs.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Number of Bits | 12 | Resolution of the DAC |
| Number of D/A Converters | 1 | Single DAC |
| Settling Time | 5 µs | Time for the output to settle to within 0.01% FSR (1/2 LSB) |
| Output Type | Voltage - Buffered | Type of output signal |
| Differential Output | No | No differential output available |
| Data Interface | Parallel | Method of data input |
| Reference Type | External | Requires an external reference voltage |
| Voltage - Supply, Analog | ±14.25 V ~ 15.75 V | Analog supply voltage range |
| INL/DNL (LSB) | ±0.75 (Max), ±1 (Max) | Integral and Differential Non-Linearity |
| Architecture | R-2R | Resistor ladder architecture |
| Operating Temperature | 0°C ~ 70°C | Temperature range for operation |
| Package | 24-SOIC (0.295", 7.50mm Width) | Package type and dimensions |
Key Features
- 4-Quadrant Multiplying Capability: The AD7845KR-REEL features full 4-quadrant multiplying, allowing it to handle both positive and negative reference voltages and output voltages.
- Integrated Output Amplifier: The on-chip amplifier reduces the need for external components, saving space and simplifying the design.
- Matched Application Resistors: Three application resistors (RA, RB, RC) are provided for gain ranging and voltage offsetting.
- Low Power LC2MOS Process: Fabricated using the LC2MOS process, which allows for precision linear components and digital circuitry on the same chip.
- TTL and 5 V CMOS Compatible Digital Inputs: Easy interfacing with microprocessors due to standard CS and WR signals and TTL/CMOS compatibility.
- Internally Compensated Amplifier: The output amplifier is internally compensated with a low input offset voltage due to laser trimming at wafer level.
Applications
- Automatic Test Equipment: Used in test and measurement equipment for precise voltage generation.
- Digital Attenuators: Employed in signal processing applications requiring adjustable attenuation.
- Programmable Power Supplies: Utilized in power supply systems that require programmable output voltages.
- Programmable Gain Amplifiers: Used in amplifier circuits where the gain needs to be programmatically adjusted.
- mA Converters: Applied in current-to-voltage conversion applications.
Q & A
- What is the resolution of the AD7845KR-REEL DAC?
The AD7845KR-REEL has a 12-bit resolution.
- What is the settling time of the AD7845KR-REEL?
The settling time is 5 µs to within 0.01% FSR (1/2 LSB).
- What type of output does the AD7845KR-REEL provide?
The output is a buffered voltage.
- Is the AD7845KR-REEL compatible with TTL and CMOS digital inputs?
Yes, it is compatible with both TTL and 5 V CMOS digital inputs.
- What is the operating temperature range of the AD7845KR-REEL?
The operating temperature range is from 0°C to 70°C.
- What is the package type of the AD7845KR-REEL?
The package type is 24-SOIC (0.295", 7.50mm Width).
- Does the AD7845KR-REEL have an integrated output amplifier?
Yes, it has an integrated output amplifier.
- What is the architecture of the AD7845KR-REEL DAC?
The architecture is R-2R resistor ladder.
- What are some common applications of the AD7845KR-REEL?
Common applications include automatic test equipment, digital attenuators, programmable power supplies, programmable gain amplifiers, and mA converters.
- How does the AD7845KR-REEL support gain ranging and voltage offsetting?
It supports gain ranging and voltage offsetting through three matched application resistors (RA, RB, RC).
