DAC0800 8-Bit High-Speed Digital-to-Analog Converter (DAC)

Overview

The DAC0800 series are monolithic 8-bit high-speed current-output digital-to-analog converters (DAC) featuring typical settling times of 100 ns. These devices are designed for applications requiring fast conversion speeds and high accuracy. The DAC0800 can operate as a multiplying DAC with excellent monotonic performance over a wide 40:1 reference current range.

The converter provides high compliance complementary current outputs that enable differential output voltages up to 20 V peak-to-peak when used with simple resistor loads. The device eliminates the need for full-scale trims in most applications due to its excellent reference-to-full-scale current matching of better than ±1 LSB.

Key Features

• Fast settling time: 100 ns typical
• 8-bit resolution
• High compliance complementary current outputs
• Differential output voltage capability: 20 Vp-p
• Excellent linearity: better than ±0.1% over temperature
• Reference-to-full-scale current matching: better than ±1 LSB
• Monotonic performance over 40:1 reference current range
• Wide power supply range: ±4.5V to ±18V
• Low power consumption: 33 mW typical at ±5V supplies
• Fully compatible with TTL, DTL, and CMOS logic

Applications

The DAC0800 is suitable for a wide range of applications including:

• Waveform generation
• Programmable power supplies
• Automatic test equipment
• Process control systems
• Digital offset and gain adjustment
• Analog multiplexing
• Precision motor control
• Data acquisition systems
• Audio processing equipment

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V+ to V-): 36V
• Digital Input Voltage: -0.3V to +18V
• Reference Input Voltage: -25V to +25V
• Output Compliance Voltage: -10V to +18V
• Power Dissipation: 500 mW
• Operating Temperature Range: -55°C to +125°C
• Storage Temperature Range: -65°C to +150°C

DC Characteristics (TA = 25°C, V+ = +5V, V- = -5V unless otherwise specified)

• Resolution: 8 bits
• Integral Nonlinearity: ±0.1% FSR max
• Differential Nonlinearity: ±0.1% FSR max
• Full-Scale Current: 2 mA nominal
• Reference Input Resistance: 5 kΩ nominal
• Logic Input High Voltage: 2.0V min
• Logic Input Low Voltage: 0.8V max
• Logic Input Current: ±10 μA max
• Power Supply Rejection Ratio: ±0.05%/%ΔV

AC Characteristics

• Settling Time to ±0.1%: 100 ns typical
• Output Current Rise Time: 40 ns typical
• Output Current Fall Time: 40 ns typical
• Glitch Energy: 15 nV-s typical
• Digital Feedthrough: ±0.1% FSR max

Functional Description

The DAC0800 is a current-output digital-to-analog converter that converts an 8-bit digital input word into an equivalent analog output current. The device uses an R-2R ladder network to achieve high accuracy and fast settling times. The complementary current outputs (IOUT and IOUT) allow for differential voltage outputs when connected to external resistors.

The reference current (IREF) determines the full-scale output current and can be varied over a 40:1 range while maintaining monotonicity. The digital inputs are fully compatible with TTL, DTL, and CMOS logic levels, making the device easy to interface with most digital systems.

Package Information

Available Packages

• 16-pin Ceramic DIP (DAC0800LCN)
• 16-pin Plastic DIP (DAC0800LCN)
• 16-pin SOIC (DAC0800LCM)

Pin Configuration (16-pin DIP/SOIC)

• Pin 1: VLC (Logic Common)
• Pin 2: Bit 1 (LSB)
• Pin 3: Bit 2
• Pin 4: Bit 3
• Pin 5: Bit 4
• Pin 6: Bit 5
• Pin 7: Bit 6
• Pin 8: Bit 7
• Pin 9: Bit 8 (MSB)
• Pin 10: IOUT (Current Output)
• Pin 11: IOUT (Complementary Current Output)
• Pin 12: V- (Negative Supply)
• Pin 13: VREF (Reference Input)
• Pin 14: V+ (Positive Supply)
• Pin 15: Compensation
• Pin 16: RFB (Feedback Resistor)

Typical Application Circuit

A basic application circuit for the DAC0800 includes:

• ±5V to ±15V power supplies
• Reference voltage source (can be fixed or variable)
• Output resistor network to convert current to voltage
• Optional output amplifier for buffering

The device can be configured for unipolar or bipolar output operation depending on the application requirements. For best performance, proper bypass capacitors should be used at the power supply pins, and the compensation pin should be connected as recommended in the datasheet.

Performance Considerations

To achieve optimal performance with the DAC0800, consider the following:

• Use high-quality, low-noise power supplies with proper bypassing
• Keep digital and analog grounds separate and connect at a single point
• Use short, direct traces for high-speed digital inputs
• Select appropriate output resistors for desired voltage range
• Consider temperature effects in precision applications
• Use the compensation pin to optimize settling time if needed