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AD1868

Analog Devices
Part Number AD1868
Manufacturer Analog Devices
Description Single Supply Dual 18-Bit Audio DAC
Published Mar 23, 2005
Detailed Description a FEATURES Dual Serial Input, Voltage Output DACs Single +5 V Supply 0.004% THD+N (typ) Low Power: 50 mW (typ) 108 dB Ch...
Datasheet PDF File AD1868 PDF File

AD1868
AD1868

Overview
a FEATURES Dual Serial Input, Voltage Output DACs Single +5 V Supply 0.
004% THD+N (typ) Low Power: 50 mW (typ) 108 dB Channel Separation (min) Operates at 8؋ Oversampling 16-Pin Plastic DIP or SOIC Package APPLICATIONS Portable Compact Disc Players Portable DAT Players and Recorders Automotive Compact Disc Players Automotive DAT Players Multimedia Workstations VL 1 LL 2 Single Supply Dual 18-Bit Audio DAC AD1868* FUNCTIONAL BLOCK DIAGRAM 18-BIT DAC AD1868 16 VBL – + 14 VOL VREF 15 VS 18-BIT SERIAL REGISTER DL 3 CK 4 13 NRL DR 5 LR 6 18-BIT SERIAL REGISTER 12 AGND VREF + 11 NRR DGND 7 18-BIT DAC – 10 VOR VS PRODUCT DESCRIPTION VBR 8 9 The AD1868 is a complete dual 18-bit DAC offering excellent performance while requiring a single +5 V power supply.
It is fabricated on Analog Devices’ ABCMOS wafer fabrication process.
The monolithic chip includes CMOS logic elements, bipolar and MOS linear elements, and laser-trimmed thin-film resistor elements.
Careful design and layout techniques have resulted in low distortion, low noise, high channel separation, and low power dissipation.
The DACs on the AD1868 chip employ a partially segmented architecture.
The first three MSBs of each DAC are segmented into seven elements.
The 15 LSBs are produced using standard R-2R techniques.
The segments and R-2R resistors are laser trimmed to provide extremely low total harmonic distortion.
The AD1868 requires no deglitcher or trimming circuitry.
Low noise is achieved through the use of two noise-reduction capacitors.
Each DAC is equipped with a high performance output amplifier.
These amplifiers achieve fast settling and high slew rate, producing ± 1 V signals at load currents up to ± 1 mA.
The buffered output signal range is 1.
5 V to 3.
5 V.
Reference voltages of 2.
5 V are provided, eliminating the need for “False Ground” networks.
A versatile digital interface allows the AD1868 to be directly connected to all digital filter chips.
Fast CMOS logic elements allow f...


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