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


Application

Multichannel Audio Applications:
Compact Disc Players
Multivoice Keyboard Instruments
DAT Players and Recorders
Digital Mixing Consoles
Multimedia Workstations


Pinout




Specifications

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


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.