參數(shù)資料
型號(hào)： ADC16071CIN
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： ADC
英文描述： 16-Bit Delta-Sigma 192 ks/s Analog-to-Digital Converters
中文描述： 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDIP24
封裝： 0.300 INCH, PLASTIC, DIP-24
文件頁(yè)數(shù)： 16/20頁(yè)
文件大小： 355K
代理商： ADC16071CIN
Applications Information
(Continued)
ANALOG SIGNAL CONDITIONING
The ADC16071/ADC16471’s digital comb and FIR filter
combine to create the band-limiting anti-aliasing filter, gen-
erating a steep cutoff at the upper range of the sampled
baseband. Additional external filtering is needed to ensure
that the best conversion performance is maintained. The
external filtering uses a simple R-C lowpass filter. A sug-
gested circuit is shown inFigure 9. The values of R
1
, R
2
, C
1
,
C
2
, and C
3
are found using the following equation:
f
c (
b
3 dB)
e
1
6
q
RC
where R
e
R
1
e
R
2
and C
e
C
1
e
C
2
e
C
3
.
The effects of the external filter are minimized by choosing
a minimum cutoff frequency equal to f
CLK
/32. As an exam-
ple, for f
CLK
equal to 6.144 MHz, set R
1
e
R
2
e
82.5
X
and
C
1
e
C
2
e
C
3
e
3300 pF. This sets the input network’s
cutoff frequency at 194 kHz. For f
CLK
equal to 24.576 MHz,
set R
1
e
R
2
e
20
X
and C
1
e
C
2
e
C
3
e
3300 pF. This
sets the input network’s cutoff frequency at 803 kHz.
RELATION BETWEEN CAPACITOR DIELECTRIC AND
SIGNAL DISTORTION
For
ADC16471’s analog inputs, the dielectric plays an important
role in determining the amount of distortion generated in the
input signal. The capacitors used must have low dielectric
absorption. This requirement is fulfilled using capacitors that
any
capacitors
connected
to
the
ADC16071/
have film dielectrics. Of these, polypropylene and polysty-
rene are the best. These are followed by polycarbonate and
mylar. If ceramic capacitors are chosen, use only capacitors
with NPO dielectrics.
INTERNAL DIFFERENTIAL BANDGAP REFERENCE
A fully differential bandgap reference generates local feed-
back voltages, V
REF
a
and V
REF
b
, for the analog modula-
tor. The outputs of this reference are trimmed to be equal to
V
MID
plus or minus 1.25V. This gives a differential reference
voltage of 2.5V which results in a
g
2.5V differential input
range. The ADC16071 does not have the internal differen-
tial bandgap reference, allowing the user the flexibility to
determine the full scale range by using an external voltage
reference.
EXTERNAL VOLTAGE REFERENCE FOR THE
ADC16071
Figure 10 shows the suggested connection diagram for the
ADC16071. The LM4041-ADJ is set to 2.0V and is applied
to the ADC16071’s V
REF
a
input.
The reference voltage must be free of noise. This is accom-
plished using the same capacitor combination used with the
ADC16471’s reference pins with the exception of V
REF
b
,
which is connected to analog ground.
Figures 11 and 12 show the suggested circuits for ac-cou-
pled applications.
TL/H/11454–15
Suggested values:
R
1
e
R
2
e
20
X
, 5%, metal film
C
1
e
C
2
e
C
3
e
3300 pF, 5%,
polypropylene
*
Parallel combination of 10
m
F tan-
talum and a 0.1
m
F monolithic ce-
ramic capacitors.
FIGURE 9. Typical Connection Diagram for the ADC16471
16
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