Overview
The DAC908E/2K5 is a high-speed, 8-bit Digital-to-Analog Converter (DAC) from Texas Instruments, part of the SpeedPlus family of high-performance converters. This DAC is designed to operate at high update rates, making it suitable for a variety of demanding applications. It features a single +5V or +3V operation, low power consumption, and an internal reference option. The DAC908E/2K5 is available in a TSSOP-28 package and is optimized for excellent dynamic performance, including high Spurious-Free Dynamic Range (SFDR) and low glitch energy.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Resolution | 8 | Bits | |||
| Output Update Rate | 2.7V to 3.3V | 125 | 165 | MSPS | |
| Output Update Rate | 4.5V to 5.5V | 165 | 200 | MSPS | |
| Static Accuracy | TA = +25°C | %FSR | |||
| Output Settling Time | to 0.1% | 30 | ns | ||
| Output Rise Time | 10% to 90% | 2 | ns | ||
| Output Fall Time | 10% to 90% | 2 | ns | ||
| Glitch Impulse | 3 | pV-s | |||
| Full-Scale Output Range | All Bits High, IOUT | 2.0 | 20.0 | mA | |
| Output Compliance Range | -1.0 | +1.25 | V | ||
| Reference Voltage | +1.24 | V | |||
| Reference Tolerance | ±5 | % |
Key Features
- High-speed operation with update rates up to 165 MSPS
- Single +5V or +3V supply operation
- Low power consumption: 170mW at +5V and 45mW in power-down mode
- Internal 1.24V bandgap reference with optional external reference
- Adjustable full-scale output current from 2mA to 20mA
- High impedance current output (200kΩ) with output compliance up to 1.25V
- Differential outputs for improved dynamic performance
- Low glitch energy (3 pV-s) and high SFDR (up to 67dBc at 100MSPS)
- Edge-triggered input latches and compatibility with +3V and +5V CMOS logic families
Applications
- Medical Instrumentation: Ultrasound (DBF)
- Video and Digital TV
- Waveform Generation: Direct Digital Synthesis (DDS) and Arbitrary Waveform Generation (ARB)
- Test Instrumentation
- Communications: Transmit signal path in communication systems
Q & A
- What is the resolution of the DAC908E/2K5?
The DAC908E/2K5 has an 8-bit resolution.
- What are the typical output update rates for the DAC908E/2K5?
The typical output update rates are 165 MSPS for a 2.7V to 3.3V supply and up to 200 MSPS for a 4.5V to 5.5V supply.
- What is the power consumption of the DAC908E/2K5?
The power consumption is 170mW at +5V and 45mW in power-down mode.
- Can the DAC908E/2K5 use an external reference voltage?
Yes, the DAC908E/2K5 allows for both internal and external reference voltage options.
- What is the output compliance range of the DAC908E/2K5?
The output compliance range is from -1.0V to +1.25V.
- How is the full-scale output current adjusted?
The full-scale output current can be adjusted from 2mA to 20mA using an external resistor (RSET).
- What are the typical applications of the DAC908E/2K5?
Typical applications include medical instrumentation, video and digital TV, waveform generation, test instrumentation, and communications.
- What is the glitch impulse of the DAC908E/2K5?
The glitch impulse is 3 pV-s.
- What is the SFDR of the DAC908E/2K5 at 100MSPS?
The SFDR is up to 67dBc at 100MSPS.
- What package types are available for the DAC908E/2K5?
The DAC908E/2K5 is available in a TSSOP-28 package.
