Overview
The AD7111KNZ, produced by Analog Devices Inc., is a monolithic multiplying Digital-to-Analog Converter (DAC) known as the LOGDAC™. This component is part of the AD7111 and AD7111A series, which are renowned for their wide dynamic range and fine step resolution. The AD7111KNZ is fabricated using Linear Compatible CMOS (LC2MOS), an advanced mixed technology process that combines precision bipolar circuits with low power CMOS logic. This DAC is designed to attenuate an analog input signal over a range of 0 dB to 88.5 dB in 0.375 dB steps, making it highly versatile for various applications requiring precise signal control.
Key Specifications
| Parameter | Conditions/Comments | Units | Typical/Maximum Values |
|---|---|---|---|
| Nominal Resolution | - | dB | 0.375 |
| Accuracy Relative to 0 dB Attenuation | 0 to 36 dB range | dB | ≤ ±0.17 |
| Power Supply Voltage (VDD) | - | V | +5 |
| Input Leakage Current | Digital Inputs = VDD | µA | ±1 (max) |
| Write Pulse Width (tWR) | - | ns | 57 (min) |
| Data Valid to Write Setup Time (tDS) | - | ns | 25 (min) |
| Data Valid to Write Hold Time (tDH) | - | ns | 10 (min) |
| Current Consumption (IDD) | CS = WR = 0 V | mA | 1 (max) |
Key Features
- Wide Dynamic Range: Attenuation range from 0 dB to 88.5 dB in 0.375 dB steps.
- Small Package: Available in 16-pin DIPs, SOIC packages, and a 20-terminal LCCC package.
- Transparent Latch Operation: The AD7111A allows transparent operation of the latches by tying the CS and WR inputs low.
- Fast Microprocessor Interface: Compatible with modern microprocessors due to fast data setup times and write pulse widths.
- Pin and Function Compatibility: The AD7111A is pin and function-compatible with the AD7524, an industry standard 8-bit multiplying DAC.
Applications
The AD7111KNZ is suitable for various applications requiring precise analog signal attenuation, such as:
- Audio and video signal processing systems.
- Industrial control systems where fine-tuned signal control is necessary.
- Medical equipment that requires high precision in signal attenuation.
- Telecommunication systems for signal level adjustment.
Q & A
- What is the dynamic range of the AD7111KNZ?
The AD7111KNZ can attenuate an analog input signal over a range of 0 dB to 88.5 dB in 0.375 dB steps.
- What are the available package types for the AD7111KNZ?
The AD7111KNZ is available in 16-pin DIPs, SOIC packages, and a 20-terminal LCCC package.
- How does the AD7111A differ from the AD7111 in terms of latch operation?
The AD7111A allows transparent operation of the latches by tying the CS and WR inputs low, whereas the AD7111 requires a rising edge on the WR input to load new data.
- Is the AD7111KNZ compatible with modern microprocessors?
- Can the AD7111A replace the AD7524 in existing designs?
- What is the power supply voltage requirement for the AD7111KNZ?
The AD7111KNZ requires a power supply voltage (VDD) of +5 V.
- What is the typical current consumption of the AD7111KNZ?
The typical current consumption (IDD) of the AD7111KNZ is 1 mA when CS = WR = 0 V.
- What is the minimum write pulse width (tWR) for the AD7111KNZ?
The minimum write pulse width (tWR) for the AD7111KNZ is 57 ns.
- What is the minimum data valid to write setup time (tDS) for the AD7111KNZ?
The minimum data valid to write setup time (tDS) for the AD7111KNZ is 25 ns.
- Is the AD7111KNZ still in production?
No, the AD7111KNZ is obsolete and no longer manufactured.
