AD1864 General Description
The AD1864 is a complete dual 18-bit DAC offering excellentTHD+N, while requiring no external components. Two complete signal channels are included. This results in cophasedvoltage or current output signals and eliminates the need foroutput demultiplexing circuitry. The monolithic AD1864 chipincludes CMOS logic elements, bipolar and MOS linearelements and laser-trimmed thin-film resistor elements, allfabricated on Analog Devices BiMOS II process.
The DACs on the AD1864 chip employ a partially-segmentedarchitecture. The first four MSBs of each DAC are segmentedinto 15 elements. The 14 LSBs are produced using standardR-2R techniques. Segment and R-2R resistors are laser-trimmed to provide extremely low total harmonic distortion.This architecture minimizes errors at major code transitionsresulting in low output glitch and eliminating the need for anexternal deglitcher. When used in the current output mode, theAD1864 provides two cophased ±1 mA output signals.
AD1864 Maximum Ratings
VL to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 13.2 V
VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 13.2 V
VL to DGND . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 V to 0 V
VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 V to 0 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V
Digital Inputs to DGND . . . . . . . . . . . . . . . . . . . 0.3 V to VL
Short-Circuit Protection . . . . . . . .Indefinite Short to Ground
Soldering (10 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . .+300°C
AD1864 Features
Dual Serial Input, Voltage Output DACs
No External Components Required
Operates at 8 Oversampling per Channel5 V to 12 V Operation
Cophased Outputs
115 dB Channel Separation0.3% Interchannel Gain Matching
0.0017% THD+N
AD1864 Typical Application
Multichannel Audio Applications:
Compact Disc Players
Multivoice Keyboard Instruments
DAT Players and Recorders
Digital Mixing Consoles
Multimedia Workstations
AD1864 Connection Diagram
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