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AD1868N-J Arkusz danych(PDF) 4 Page - Analog Devices

Numer części AD1868N-J
Szczegółowy opis  Single Supply Dual 18-Bit Audio DAC
Download  12 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD1868N-J Arkusz danych(HTML) 4 Page - Analog Devices

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AD1868
REV. A
–4–
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
12
13
14
15
11
16
LL
DL
CK
DR
LR
DGND
NRL
AGND
NRR
VL
VBR
AD1868
TOP VIEW
(Not To Scale)
VS
VS
VOR
VOL
VBL
DEFINITION OF SPECIFICATIONS
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 am-
plitudes of the harmonics and noise to the amplitude of the fun-
damental input frequency. It is usually expressed in percent (%)
or decibels (dB).
D-Range Distortion
D-range distortion is the ratio of the amplitude of the signal at
an amplitude of –60 dB to the amplitude of the distortion plus
noise. In this case, an A-weight filter is used. The value speci-
fied for D-range performance is the ratio measured plus 60 dB.
Signal-to-Noise Ratio
The signal-to-noise ratio is defined as the ratio of the amplitude
of the output when a full-scale output is present to the ampli-
tude of the output with no signal 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 lower level. A per-
fect D/A converter exhibits no difference between the ideal and
actual amplitudes. Gain linearity is expressed in decibels (dB).
Midscale Error
Midscale error is the difference between the analog output and
the bias when the twos complement input code representing
midscale is loaded in the input register. Midscale error is ex-
pressed in mV.
ORDERING GUIDE
THD + N
Package
Model
@ FS
SNR
Option*
AD1868N
0.008%
95 dB
N-16
AD1868R
0.008%
95 dB
R-16
AD1868N-J
0.006%
95 dB
N-16
AD1868R-J
0.006%
95 dB
R-16
*N = Plastic DIP; R = SOIC.
PIN DESIGNATIONS
11VL
Digital Supply (+5 Volts)
12
LL
Left Channel Latch Enable
13
DL
Left Channel Data Input
14
CK
Clock Input
15
DR
Right Channel Data Input
16
LR
Right Channel Latch Enable
17
DGND
Digital Common
18VBR
Right Channel Bias
19VS
Analog Supply (+5 Volts)
10
VOR
Right Channel Output
11
NRR
Right Channel Noise Reduction
12
AGND
Analog Common
13
NRL
Left Channel Noise Reduction
14
VOL
Left Channel Output
15
VS
Analog Supply (+5 Volts)
16
VBL
Left Channel Bias
FUNCTIONAL DESCRIPTION
The AD1868 is a complete, voltage output dual 18-bit digital
audio DAC which operates with a single +5 volt supply. As
shown in the block diagram, each channel contains a voltage
reference, an 18-bit DAC, an output amplifier, an 18-bit input
latch, and an 18-bit serial-to-parallel input register.
The voltage reference section provides a reference voltage and a
false ground voltage for each channel. The low noise bandgap
circuits produce reference voltages that are unaffected by
changes in temperature, time, and power supply.
The output amplifier uses both MOS and bipolar devices and
incorporates an NPN class-A output stage. It is designed to pro-
duce high slew rate, low noise, low distortion, and optimal fre-
quency response.
Each 18-bit DAC uses a combination of segmented decoder
and R-2R architecture to achieve good integral and differential
linearity. The resistors which form the ladder structure are fab-
ricated with silicon-chromium thin film. Laser trimming of
these resistors further reduces linearity error, resulting in low
output distortion.
The input registers are fabricated with CMOS logic gates.
These gates allow fast switching speeds and low power con-
sumption, contributing to the fast digital timing, low glitch, and
low power dissipation of the AD1868.


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