a
FEATURES
Dual Serial Input, Voltage Output DACs
Single +5 Volt Supply
0.005% THD+N
Low Power –50 mW
115 dB Channel Separation
Operates at 8؋ Oversampling
16-Pin Plastic DIP or SOIC Package
APPLICATIONS
Multimedia Workstations
PC Audio Add-In Boards
Portable CD and DAT Players
Automotive CD and DAT Players
Noise Cancellation
Single Supply
Dual 16-Bit Audio DAC
AD1866
FUNCTIONAL BLOCK DIAGRAM
16-BIT
V
L
1
LL
2
DL
3
16-BIT
SERIAL
REGISTER
CLK
4
DR
5
LR
6
DGND
7
AD1866
DAC
VBR
16
15
13
NRL
12
VREF
VOL
AGND
11
NRR
10
16-BIT
SERIAL
REGISTER
VS
14
V
REF
VBL
VOR
9
VS
16-BIT
DAC
8
PRODUCT DESCRIPTION
The AD1866 is a complete dual 16-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, thinfilm 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 AD1866 chip employ a partially segmented
architecture. The first three MSBs of each DAC are segmented
into 7 elements. The 13 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 AD1866 requires no deglitcher or trimming circuitry.
The AD1866 operates on +5 V power supplies. The digital
supply, VL, can be separated from the analog supply, VS, for reduced digital feedthrough. Separate analog and digital ground
pins are also provided. In systems employing a single +5 volt
power supply, VL and VS should be connected together. In battery operated systems, operation will continue even with reduced supply voltage. Typically, the AD1866 dissipates 50 mW.
The AD1866 is packaged in either a 16-pin plastic DIP or a
16-pin plastic SOIC package. Operation is guaranteed over the
temperature range of –35°C to +85°C and over the voltage
supply range of 4.75 V to 5.25 V.
PRODUCT HIGHLIGHTS
1. Single supply operation @ +5 V.
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. The 2.5 V reference
voltages eliminate the need for “false ground” networks.
2. 50 mW power dissipation.
A versatile digital interface allows the AD1866 to be directly
connected to all digital filter chips. Fast CMOS logic elements
allow for an input clock rate of up to 16 MHz. This allows for
operation at 2×, 4×, 8×, or 16× the sampling frequency (where
FS = 44.1 kHz) for each channel. The digital input pins of the
AD1866 are TTL and +5 V CMOS compatible.
6. Compatible with all digital filter chips.
3. THD+N is 0.005% (typical).
4. Signal-to-Noise Ratio is 95 dB (typical).
5. 115 dB channel separation (typical).
7. 16-pin DIP and 16-pin SOIC packages.
8. No deglitcher required.
9. No external adjustments required.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
