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Analog Devices Semiconductor Electronic Components Datasheet



AD1866

Single Supply Dual 16-Bit Audio DAC



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AD1866 pdf
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
VL 1
LL 2
DL 3
CLK 4
DR 5
LR 6
DGND 7
VBR 8
16-BIT
DAC
16-BIT
SERIAL
REGISTER
16-BIT
SERIAL
REGISTER
16-BIT
DAC
AD1866
16 VBL
15 VS
14 VOL
VREF
13 NRL
12 AGND
VREF
11 NRR
10 VOR
9 VS
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, thin-
film resistor elements. Careful design and layout techniques
have resulted in low distortion, low noise, high channel separa-
tion 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.
Each DAC is equipped with a high performance output ampli-
fier. These amplifiers achieve fast settling and high slew rate,
producing ± 1 V signals at load currents up to ± 1 mA. The buff-
ered output signal range is 1.5 V to 3.5 V. The 2.5 V reference
voltages eliminate the need for “false ground” networks.
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.
The AD1866 operates on +5 V power supplies. The 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.
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.
2. 50 mW power dissipation.
3. THD+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.
9. No external adjustments required.
*Protected by U.S. Patent Nos: 3,961,326; 4,141,004; 4,349,811; 4,857,862;
and patents pending.
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



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AD1866 pdf
AD1866–SPECIFICATIONS (TA = +25؇C and +5 V supplies unless otherwise noted)
Min Typ
Max
RESOLUTION
16
DIGITAL INPUTS VIH
VIL
IIH, VIH = VL
IIL, VIL = DGND
Maximum Clock Input Frequency
2.4
0.8
1.0
–10.0
13.5
ACCURACY
Gain Error
Gain Matching
Midscale Error
Midscale Error Matching
Gain Linearity Error
±3
±3
± 30
± 10
±3
DRIFT (0°C to +70°C)
Gain Drift
Midscale Drift
± 100
–130
TOTAL HARMONIC DISTORTION + NOISE
0 dB, 990.5 Hz AD1866N
AD1866R
–20 dB, 990.5 Hz AD1866N
AD1866R
–60 dB, 990.5 Hz AD1866N
AD1866R
0.005
0.005
0.02
0.02
2.0
2.0
0.01
0.01
CHANNEL SEPARATION (1 kHz, 0 dB)
108 115
SIGNAL-TO-NOISE RATIO (With A-Weight Filter)
95
D-RANGE (With A-Weight Filter)
90
OUTPUT
Voltage Output Pins (VOL, VOR)
Output Range (± 3%)
Output Impedance
Load Current
Bias Voltage Pins (VBL, VBR)
Output Range
Output Impedance
±1
0.1
±1
+2.5
350
POWER SUPPLY
Specification, VL and VS
Operation, VL and VS
+I, VL and VS = 5 V
POWER DISSIPATION
4.75 5
3.5
10
50
5.25
5.25
14
70
TEMPERATURE RANGE
Operation
Storage
–35 85
–60 100
Specifications subject to change without notice.
Specifications in boldface are tested on all production units at final electrical
Unit
Bits
V
V
µA
µA
MHz
% of FSR
% of FSR
mV
mV
dB
ppm/°C
µV/°C
%
%
%
%
%
%
dB
dB
dB
V
mA
V
V
V
mA
mW
°C
°C
–2– REV. 0



Part Number AD1866
Description Single Supply Dual 16-Bit Audio DAC
Maker Analog Devices - Analog Devices
Total Page 12 Pages
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