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Analog Devices Semiconductor Electronic Components Datasheet

AD1868 Datasheet

Single Supply Dual 18-Bit Audio DAC

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AD1868 pdf
a
Single Supply
Dual 18-Bit Audio DAC
AD1868*
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
PRODUCT DESCRIPTION
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 pro-
cess. The monolithic chip includes CMOS logic elements, bipo-
lar and MOS linear elements, and laser-trimmed thin-film
resistor elements. Careful design and layout techniques have re-
sulted 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 ampli-
fier. 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 volt-
ages 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 for an input clock rate of up to 13.5 MHz. This allows for
operation at 2×, 4×, 8×, or 16× the sampling frequency for each
channel. The digital input pins of the AD1868 are TTL and
+5 V CMOS compatible.
*Protected by U.S. Patent Numbers: 3,961,326; 4,141,004; 4,349,811;
4,857,862; and patents pending.
FUNCTIONAL BLOCK DIAGRAM
VL 1
LL 2
DL 3
CK 4
DR 5
LR 6
DGND 7
VBR 8
18-BIT
DAC
18-BIT
SERIAL
REGISTER
18-BIT
SERIAL
REGISTER
18-BIT
DAC
AD1868
16 VBL
+
VREF
15 VS
14 VOL
13 NRL
VREF
+
12 AGND
11 NRR
10 VOR
9 VS
The AD1868 operates on +5 V power supplies. The digital sup-
ply, 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 reduced
supply voltage. Typically, the AD1868 dissipates 50 mW.
The AD1868 is packaged in either a 16-pin plastic DIP or a 16-
pin plastic SOIC package. Operation is guaranteed over the tem-
perature 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 (typical).
3. THD+N is 0.004% (typical).
4. Signal-to-Noise Ratio is 97.5 dB (typical).
5. 108 dB channel separation (minimum).
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.
REV. A
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


Analog Devices Semiconductor Electronic Components Datasheet

AD1868 Datasheet

Single Supply Dual 18-Bit Audio DAC

No Preview Available !

AD1868 pdf
AD1868–SPECIFICATIONS (typical at TA = +25؇C and +5 V supplies unless otherwise noted)
RESOLUTION
DIGITAL INPUTS VIH
VIL
IIH, VIH = VL
IIL, VIL = DGND
Maximum Clock Input Frequency
ACCURACY
Gain Error
Gain Matching
Midscale Error
Midscale Error Matching
Gain Linearity Error
DRIFT (0°C to +70°C)
Gain Drift
Midscale Drift
TOTAL HARMONIC DISTORTION + NOISE
0 dB, 990.5 Hz AD1868N
AD1868N-J
–20 dB, 990.5 Hz AD1868N
AD1868N-J
–60 dB, 990.5 Hz AD1868N
AD1868N-J
CHANNEL SEPARATION 1 kHz, 0 dB
SIGNAL-TO-NOISE RATIO (with A-Weight Filter)
D-RANGE (with A-Weight Filter)
OUTPUT
Voltage Output Pins (VOL, VOR)
Output Range (± 3%)
Output Impedance
Load Current
Bias Voltage Pins (VBL, VBR)
Output Voltage
Output Impedance
POWER SUPPLY
Specification, VL and VS
Operation, VL and VS
+I, VL and VS = 5 V
POWER DISSIPATION
TEMPERATURE RANGE
Specification
Operation
Storage
*Above 115 dB.
Specifications subject to change without notice.
Min
2.4
13.5
108
95
86
4.75
3.5
0
–35
–60
Typ
18
1.0
1.0
±1
±1
± 15
± 10
±3
± 100
± 100
0.004
0.004
0.020
0.020
2.0
2.0
NIL*
97.5
92
±1
0.1
±1
+2.5
350
5
10
50
25
Max
0.8
0.008
0.006
0.08
0.08
5.0
5.0
5.25
5.25
14
70
70
85
100
Units
Bit
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
°C
ABSOLUTE MAXIMUM RATINGS*
VL to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 6 V
VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 6 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 0.3 V
Digital Inputs to DGND . . . . . . . . . . . . . . . . . . . . . –0.3 to VL
Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C, 10 sec
*Stresses greater than those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD1868 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
–2–
WARNING!
ESD SENSITIVE DEVICE
REV. A


Part Number AD1868
Description Single Supply Dual 18-Bit Audio DAC
Maker Analog Devices
Total Page 12 Pages
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