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Part No.	AD9767
Manufacturer	AD
Size	469 Kbytes
Pages	27 pages
Description	14-Bit, 125 MSPS Dual TxDAC+ D/A Converter

Datasheet Summary with AI

1. Overview & Purpose

️· The AD9767 is a dual, 14-bit current output Digital-to-Analog Converter (DAC).
️· It's designed for applications requiring high accuracy, low noise, and flexibility. These include: portable audio, industrial control, data acquisition, and test equipment.

2. Key Features

️· Dual 14-bit DACs: Two independent DACs in a single chip.
️· High Accuracy: Focuses on linearity and minimal error.
️· Current Output: Outputs current, allowing for flexible gain and impedance matching.
️· Flexible Configuration: Supports dual-port or interleaved operation.
️· Adjustable Full-Scale Range: FSADJ1 and FSADJ2 pins allow adjustment of the output current range.
️· GAINCTRL: Provides a selectable gain.
️· Low Noise: Designed for low-noise performance.
️· Power Supply Flexibility: Operates with various power supply voltages.

3. Specifications

️· Resolution: 14 bits
️· Temperature Range: -40°C to +85°C
️· Power Supply Voltages: Specified voltage ranges (See datasheet for details)
️· Output Compliance: Ranges for acceptable voltage at output.
️· Linearity Error: Defined and targeted for high accuracy.
️· Differential Nonlinearity (DNL): Measures variation in output with code changes.
️· Offset Error: Deviation from zero output.
️· Gain Error: Difference between ideal and actual output span.
️· Power Supply Rejection: Measures performance under supply voltage changes.
️· Settling Time: Time for output to stabilize.
️· Glitch Impulse: Area of undesired output transients.
️· Spurious-Free Dynamic Range: Measurement of signal quality.
️· Total Harmonic Distortion (THD): A measure of signal distortion.

4. Pin Descriptions

️· PORT1 & PORT2: Data input bits (DB13-P1 to DB0-P1 and DB13-P2 to DB0-P2).
️· DCOM1 & DCOM2: Digital Common.
️· DVDD1 & DVDD2: Digital Supply Voltage.
️· WRT1/IQWRT, WRT2/IQSEL: Write signals for data input.
️· CLK1/IQCLK, CLK2/IQRESET: Clock input.
️· SLEEP: Power-down control.
️· ACOM: Analog Common.
️· IOUTA2, IOUTB2 & IOUTA1, IOUTB1: Differential current outputs.
️· FSADJ2 & FSADJ1: Full-scale adjustment.
️· REFIO: Reference input/output.
️· GAINCTRL: Mode selection for gain.
️· MODE: Mode selection (dual port or interleaved)

5. Operational Configurations

️· Dual-Port Mode: Each DAC operates independently.
️· Interleaved Mode: Data is sent to both DACs simultaneously, useful for higher data rates.

6. Test Setup Diagram

️· Figure 2 shows a basic setup for characterizing the AC performance of Port 1 in dual port mode.

7. Important Notes

️· ESD Sensitivity: The AD9767 is sensitive to Electrostatic Discharge (ESD) and requires handling precautions.
️· Thermal Resistance: Specifications are provided for thermal management.