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Analog Devices Semiconductor Electronic Components Datasheet



AD1862

Ultralow Noise 20-Bit Audio DAC


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AD1862 pdf
a
FEATURES
120 dB Signal-to-Noise Ratio
102 dB D-Range Performance
؎1 dB Gain Linearity
؎1 mA Output Current
16-Pin DIP Package
0.0012% THD + N
APPLICATIONS
High Performance Compact Disc Players
Digital Audio Amplifiers
Synthesizer Keyboards
Digital Mixing Consoles
High Resolution Signal Processing
Ultralow Noise
20-Bit Audio DAC
AD1862*
FUNCTIONAL BLOCK DIAGRAM
–VS 1
–VS 2
TRIM 3
+VL 4
CLK 5
LE 6
DATA 7
–VL 8
VOLTAGE
REFERENCE
INPUT
&
DIGITAL
OFFSET
20-BIT
DAC
AD1862
16 +VS
15 NR2
14 ADJ
13 NR1
12 AGND
11 IOUT
10 RF
9 DGND
PRODUCT DESCRIPTION
The AD1862 is a monolithic 20-bit digital audio DAC. Each
device provides a 20-bit DAC, 20-bit serial-to-parallel input
register and voltage reference. The digital portion of the
AD1862 is fabricated with CMOS logic elements that are pro-
vided by Analog Devices’ BiMOS II process. The analog por-
tion of the AD1862 is fabricated with bipolar and MOS devices
as well as thin-film resistors.
New design, layout and packaging techniques all combine to
produce extremely high performance audio playback. The de-
sign of the AD1862 incorporates a digital offset circuit which
improves low-level distortion performance. Low stress packag-
ing techniques are used to minimize stress-induced parametric
shifts. Stress-sensitive circuit elements are located in die areas
which are least affected by packaging stress. Laser-trimming of
initial linearity error affords extremely low total harmonic
distortion. Output glitch is also small, contributing to the over-
all high level of performance.
The noise performance of the AD1862 is excellent. When used
with the recommended two external noise-reduction capacitors,
it achieves 120 dB signal-to-noise ratio.
The serial input port consists of the clock, data and latch enable
pins. A serial 20-bit, 2s complement data word is clocked into
the DAC, MSB first, by the external data clock. A latch-enable
signal transfers the input word from the internal serial input
register to the DAC input register. The data clock can function
at 17 MHz, allowing 16 × FS operation. The serial input port is
compatible with second-generation digital filter chips for con-
sumer audio products such as the NPC SM5813 and SM5818.
The AD1862 operates with ± 5 V to ± 12 V supplies for the dig-
ital power supplies and ± 12 V supplies for the analog supplies.
The digital and analog supplies can be separated for reduced
digital crosstalk. Separate analog and digital common pins are
also provided. The AD1862 typically dissipates less than
300 mW.
The AD1862 is packaged in a 16-pin plastic DIP. The operating
range is guaranteed to be –25°C to +70°C.
PRODUCT HIGHLIGHTS
1. 120 dB signal-to-noise ratio. (typical)
2. 102 dB D-Range performance. (minimum)
3. ± 1 dB gain linearity @ –90 dB amplitude.
4. 20-bit resolution provides 120 dB of dynamic range.
5. 16 × FS operation.
6. 0.0016% THD+N @ 0 dB signal amplitude. (typical)
7. Space saving 16-pin DIP package.
8. ± 1 mA output current.
*Protected by U.S. Patent Numbers: 4,349,811; 4,857,862; 4,855,618;
3,961,326; 4,141,004; 4,902,959.
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



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AD1862 pdf
AD1862–SPECIFICATIONS (TA at +25؇C and ؎12 V supplies, see Figure 10 for test circuit schematic)
Min Typ
Max
Units
RESOLUTION
20 Bits
DIGITAL INPUTS VIH
VIL
IIH @ VIH = 4.0 V
IIL @ VIL = 0.4 V
Maximum Clock Input Frequency
2.0 4.0
0.4
17
0.8
1.0
–10
V
V
µA
µA
MHz
ACCURACY
Gain Error
Midscale Output Error
TOTAL HARMONIC DISTORTION + NOISE (EIAJ)1
0 dB, 990.5 Hz AD1862N-J
AD1862N
–20 dB, 990.5 Hz AD1862N, N-J
–60 dB, 990.5 Hz AD1862N, N-J
D-Range, –60 dB, A-Weight Filter
SIGNAL-TO-NOISE RATIO2: (EIAJ)1
A-Weight Filter AD1862N-J
AD1862N
±2
±2 ±5
%
µA
–98 (0.0012)
–96 (0.0016)
dB (%)
–94 (0.0019)
–92 (0.0025)
dB (%)
–84 (0.0063)
–80 (0.01)
dB (%)
–45 (0.56)
–42 (0.8)
dB (%)
102 dB
113 119
110 119
dB
dB
GAIN LINEARITY
@ –90 dB
AD1862N-J
AD1862N
± 1 dB
± 1 dB
OUTPUT CURRENT
Bipolar Range
Tolerance
Output Impedance (± 30%)
Settling Time
±1
± 1 ؎2
2.1
350
mA
%
k
ns
FEEDBACK RESISTOR
Value
Tolerance
3
± 1 ؎2
k
%
POWER SUPPLY
Voltage
Voltage
Current
VL and –VL
VS and –VS
+I, VL and VS = 12 V, 17 MHz Clock
–I, –VL and –VS = –12 V, 17 MHz Clock
POWER DISSIPATION
VL and VS = 12 V, –VL and –VS = –12 V, 17 MHz Clock
TEMPERATURE RANGE
Specification
Operation
Storage
4.75
10.8
–25
–60
12.0
12.0
11
13
288
+25
13.2
13.2
15
16
372
+70
+100
±V
±V
mA
mA
mW
°C
°C
°C
NOTES
1Test Method complies with EIAJ Standard CP-307.
2The signal-to-noise measurement includes noise contributed by the SE5534A op amp used in the test fixture but does not include the noise contributed by the low
pass filter used in the test fixture.
Specifications in boldface are tested on all production units at final electrical test.
Specifications subject to change without notice.
–2– REV. A



Part Number AD1862
Description Ultralow Noise 20-Bit Audio DAC
Maker Analog Devices - Analog Devices
Total Page 12 Pages
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