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LTC1609ACSW 数据表(PDF) 12 Page - Linear Technology

部件名 LTC1609ACSW
功能描述  16-Bit, 200ksps, Serial ADC with Multiple Input Ranges
PDF  24 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1609ACSW 数据表(HTML) 12 Page - Linear Technology

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LTC1609
1609fa
APPLICATIO S I FOR ATIO
Table 1c. LTC1609 Output Codes for Ideal Input Voltages
TWO’S COMPLEMENT
STRAIGHT BINARY
DESCRIPTION
ANALOG INPUT
(SB/BTC LOW)
(SB/BTC HIGH)
Full-Scale Range
±10V
±5V
±3.34
0V to 10V
0V to 5V
0V to 4V
Least Significant Bit
305
µV
153
µV
102
µV
153
µV76µV61µV
+Full Scale (FS – 1LSB) 9.999695V 4.999847V
3.339898V
9.999847V 4.999924V 3.999939V
0111 1111 1111 1111
1111 1111 1111 1111
Midscale
0V
0V
0V
5V
2.5V
2V
0000 0000 0000 0000
1000 0000 0000 0000
1LSB Below Midscale
– 305
µV
–153
µV
–102
µV
4.999847V 2.499924V 1.999939V
1111 1111 1111 1111
0111 1111 1111 1111
– Full Scale
–10V
– 5V
– 3.340000V
0V
0V
0V
1000 0000 0000 0000
0000 0000 0000 0000
INPUT VOLTAGE (V)
0V
–1
LSB
1609 F04a
011...111
011...110
000...001
000...000
100...000
100...001
111...110
1
LSB
BIPOLAR
ZERO
111...111
FSR/2 – 1LSB
–FSR/2
FSR = +FS – –FS
1LSB = FSR/65536
INPUT VOLTAGE (V)
1609 F04b
111...111
111...110
100...001
100...000
000...000
000...001
011...110
011...111
FS – 1LSB
0V
1LSB = FS/65536
Figure 4a. LTC1609 Bipolar Transfer Characteristics
Figure 4b. LTC1609 Unipolar Transfer Characteristics
The ideal
±FSvalueforthe±3.3Vrangeis3.340000V–1LSB
and – 3.340000V, respectively. The external 33.2k resistor
that is connected between the CAP pin and the R2IN pin,
slightly attenuates the input signal applied to R2IN. With-
out the 33.2k resistor the
±FS value would be 3.333333V
– 1LSB and – 3.333333V (zero volt offset), respectively.
DC Performance
One way of measuring the transition noise associated with
a high resolution ADC is to use a technique where a DC
signal is applied to the input of the ADC and the resulting
output codes are collected over a large number of conver-
sions. For example in Figure 5 the distribution of output
code is shown for a DC input that has been digitized 4096
times. The distribution is Gaussian and the RMS code
transition is about 0.9LSB.
Figure 5. Histogram for 4096 Conversions
CODE
–3
0
500
1000
1500
2000
–2
–1
0
1
1609 F05
23



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