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PDF AD1862 Data sheet ( Hoja de datos )
| Número de pieza | AD1862 | |
| Descripción | Ultralow Noise 20-Bit Audio DAC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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
1 page  
AD1862
TOTAL HARMONIC DISTORTION + NOISE
Total Harmonic Distortion plus Noise (THD+N) is defined as
the ratio of the square root of the sum of the squares of the val-
ues of the harmonics and noise to the value of the fundamental
input frequency. It is usually expressed in percent (%) or deci-
bels (dB).
D-RANGE DISTORTION
D-Range Distortion is the ratio of the signal amplitude to the
distortion plus noise at –60 dB. In this case, an A-Weight filter
is used. The value specified for D-Range performance is the ra-
tio measured plus 60 dB.
SETTLING TIME
Settling Time is the time required for the output to reach and
remain within ± 1/2 LSB about its final value, measured from
the digital input transition. It is a primary measure of dynamic
performance and is usually expressed in nanoseconds (ns).
SIGNAL-TO-NOISE RATIO
The Signal-to-Noise Ratio is defined as the ratio of the ampli-
tude of the output with full-scale present to the amplitude of the
output when no signal is present. It is expressed in decibels (dB)
and measured using an A-Weight filter.
GAIN LINEARITY
Gain Linearity is a measure of the deviation of the actual output
amplitude from the ideal output amplitude. It is determined by
measuring the amplitude of the output signal as the amplitude
of that output signal is digitally reduced to a low level. A perfect
D/A converter exhibits no difference between the ideal and ac-
tual amplitudes. Gain linearity is expressed in decibels (dB).
MIDSCALE ERROR
Midscale Error, or bipolar zero error, is the deviation of the ac-
tual analog output from the ideal output when the 2s comple-
ment input code representing midscale is loaded in the input
register. The AD1862 is a current output D/A converter. There-
fore, this error is expressed in µA.
NR1
TRIM
ADJ
VS
VREF
AGND
NR2
LATCH
ENABLE
20-BIT DAC
LATCH
– VL
CLOCK
DATA
DGND
DECODER AND
DIGITAL OFFSET
SERIAL INPUT
REGISTER
AD1862 Block Diagram
FEEDBACK
REGISTER
CURRENT
OUTPUT
+ VL
FUNCTIONAL DESCRIPTION
The AD1862 is a high performance, monolithic 20-bit audio
DAC. Each device includes a voltage reference, a 20-bit DAC,
20-bit input latch and a 20-bit serial-to-parallel input register. A
special digital offset circuit, combined with segmentation cir-
cuitry, produces excellent THD+N and D-range performance.
Extensive noise-reduction features are utilized to make the noise
performance of the AD1862 as high as possible. For example,
the voltage reference circuit is a low-noise, 9 volt bandgap cell.
This cell supplies the reference voltage to the bipolar offset cir-
cuit and the DAC. An external noise-reduction capacitor is con-
nected to NR1 to form a low-pass filter network.
Additional noise-reduction techniques are used in the control
amplifier of the DAC. By connecting an external noise-reduction
capacitor to NR2 output noise contributions from the control
portion of the DAC are similarly reduced. The noise-reduction
efforts result in a signal-to-noise ratio of 120 dB.
The design of the AD1862 uses a combination of segmented de-
coder, R-2R topology and digital offset to produce low distor-
tion at all signal amplitudes. The digital offset technique shifts
the midscale output voltage (0 V) away from the MSB transition
of the device. Therefore, small amplitude signals are not af-
fected by an MSB change. An extra DAC cell is included to
avoid clipping the output at full scale.
The DAC supplies a ± 1 mA output current to an external
I-to-V converter. An on-board 3 kΩ feedback resistor is also
supplied. Both the output current and feedback resistor are
laser-trimmed to ± 2% tolerance, simplifying the selection of
external filter and/or deemphasis network components. The in-
put register and serial-to-parallel converter are fabricated with
CMOS logic gates. These gates allow the achievement of fast
switching speeds and low power consumption. Internal TTL-
to-CMOS converters are used to insure TTL and 5 V CMOS
compatibility.
REV. A
–5–
5 Page 
OTHER DIGITAL AUDIO COMPONENTS AVAILABLE
FROM ANALOG DEVICES
AD1862
–VS 1
DGND 2
+VL 3
NC 4
16-BIT
LATCH
SERIAL
INPUT
REGISTER
CLK 5
LE 6
CONTROL
LOGIC
DATA 7
–VL 8 AD1856
NC= NO CONNECT
16-BIT
DAC
IOUT
16 +VS
15 TRIM
14 MSB ADJ
13 IOUT
12 AGND
11 SJ
10 RF
9 VOUT
–VS 1
DGND 2
+VL 3
NC 4
18-BIT
LATCH
SERIAL
INPUT
REGISTER
CLK 5
LE 6
CONTROL
LOGIC
DATA 7
–VL 8 AD1860
NC= NO CONNECT
18-BIT
DAC
IOUT
16 +VS
15 TRIM
14 MSB ADJ
13 IOUT
12 AGND
11 SJ
10 RF
9 VOUT
AD1856 16-Bit Audio DAC
Complete, No External Components Required
0.0025% THD
Low Cost
16-Pin DIP or SOIC Package
Standard Pinout
AD1860 18-Bit Audio DAC
Complete, No External Components Required
0.002% THD+N
108 dB Signal-to-Noise Ratio
16-Pin DIP or SOIC Package
–VS 1
TRIM 2
MSB 3
IOUT 4
AGND 5
SJ 6
RF 7
VOUT 8
+VL 9
DR 10
LR 11
CK 12
AD1864
REFERENCE
REFERENCE
18-BIT
LATCH
18-BIT
DAC
18-BIT
DAC
18-BIT
LATCH
24 +VS
23 TRIM
22 MSB
21 IOUT
20 AGND
19 SJ
18 RF
17 VOUT
16 –VL
15 DL
14 LL
13 DGND
AD1864 Dual 18-Bit Audio DAC
Complete, No External Components
0.002% THD+N
115 dB Channel Separation
24-Pin DIP
REV. A
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD1862.PDF ] | |
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