Single Supply
Dual 16-Bit Audio DAC
a
AD1866*
FUNCTIO NAL BLO CK D IAGRAM
FEATURES
Dual Serial Input, Voltage Output DACs
Single +5 Volt Supply
0.005% THD+N
AD1866
16-BIT
DAC
V
1
2
V
L
16
B
L
Low Pow er –50 m W
115 dB Channel Separation
Operates at 8؋
Oversam pling
16-Pin Plastic DIP or SOIC Package
V
V
LL
15
14
13
12
11
10
16-BIT
SERIAL
REGISTER
S
L
DL
3
4
O
CLK
V
V
NRL
APPLICATIONS
REF
Multim edia Workstations
PC Audio Add-In Boards
Portable CD and DAT Players
Autom otive CD and DAT Players
Noise Cancellation
AGND
NRR
5
6
7
8
DR
LR
16-BIT
SERIAL
REGISTER
REF
DGND
V
R
O
16-BIT
DAC
V
R
V
B
9
S
P RO D UCT D ESCRIP TIO N
T he AD1866 operates on +5 V power supplies. T he digital
supply, VL, can be separated from the analog supply, VS, for re-
duced 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 bat-
tery operated systems, operation will continue even with re-
duced supply voltage. Typically, the AD1866 dissipates 50 mW.
T he 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. T he 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 separa-
tion and low power dissipation.
T he 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.
T he DACs on the AD1866 chip employ a partially segmented
architecture. T he first three MSBs of each DAC are segmented
into 7 elements. T he 13 LSBs are produced using standard
R-2R techniques. T he segments and R-2R resistors are laser
trimmed to provide extremely low total harmonic distortion.
T he AD1866 requires no deglitcher or trimming circuitry.
P RO D UCT H IGH LIGH TS
1. Single supply operation @ +5 V.
2. 50 mW power dissipation.
Each DAC is equipped with a high performance output ampli-
fier. T hese amplifiers achieve fast settling and high slew rate,
producing ±1 V signals at load currents up to ±1 mA. T he buff-
ered output signal range is 1.5 V to 3.5 V. T he 2.5 V reference
voltages eliminate the need for “false ground” networks.
3. T HD+N is 0.005% (typical).
4. Signal-to-Noise Ratio is 95 dB (typical).
5. 115 dB channel separation (typical).
6. Compatible with all digital filter chips.
7. 16-pin DIP and 16-pin SOIC packages.
8. No deglitcher required.
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. T his allows for
operation at 2×, 4×, 8×, or 16× the sampling frequency (where
FS = 44.1 kHz) for each channel. T he digital input pins of the
AD1866 are T T L and +5 V CMOS compatible.
9. No external adjustments required.
*P r otected by U.S. P atent Nos: 3,961,326; 4,141,004; 4,349,811; 4,857,862;
and patents pending.
REV. 0
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 617/ 329-4700
Fax: 617/ 326-8703
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