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CS5520-BP 데이터시트(PDF) 11 Page - Cirrus Logic

부품명 CS5520-BP
상세설명  16BIT/20-BIT BRIDGE TRANSDUCER A/D CONVERTER
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5520-BP 데이터시트(HTML) 11 Page - Cirrus Logic

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THEORY OF OPERATION
The front page of this data sheet illustrates the
block diagram of the CS5516 and CS5520 A/D
converter. The device includes an instrumenta-
tion amplifier with a fixed gain of 25. This
chopper-stabilized instrumentation amplifier is
followed by a programmable gain stage with
gain settings of 1, 2, 4, and 8. The sensitivity of
the input is a function of the programmable gain
setting and of the reference voltage connected
between the VREF+ and VREF- pins of the de-
vice. The full scale of the converter is VREF/( G
x 25) in unipolar, or
±VREF/(G x 25) in bipolar,
where VREF is the reference voltage between
the VREF+ and VREF- pins, G is the gain set-
ting of the programmable gain amplifier, and 25
is the gain of the instrumentation amplifier.
After the programmable gain block, the output
of a 4-bit DAC is combined with the input sig-
nal. The DAC can be used to add or subtract
offset from the analog input signal. Offsets as
large as
±200 % of full scale can be trimmed
from the input signal.
The CS5516 and CS5520 are optimized to per-
form ratiometric measurement of bridge-type
transducers. The devices support dc bridge exci-
tation or two modes of ac (switched dc) bridge
excitation. In the switched-dc modes of opera-
tion the converter fully demodulates both the
reference voltage and the analog input signal
from the bridge.
XOUT
VD+
VA+
VREF+
VREF-
DGND
VA-
1
µF
AIN+
AIN-
MDRV-
0.1
µF
SCLK
SOD
SID
SMODE
CS5516
CS5520
XIN
0.1
µF
10
0.1
µF
VD-
AGND2
MDRV+
DRDY
CS
10
+5V
Analog
Supply
-5V
Analog
Supply
0.1
µF
1
µF1 µF
1
µF
1
µF
RST
+
-
1
2
9
10
6
7
5
8
AGND1
320
23
22
16
18
17
24
15
13
14
19
21
4
Unused logic inputs
must be connected
to DGND or VD+
Optional
Clock
Source
Control
Logic
Serial
Data
Interface
Figure 2. System Connection Diagram: DC Excitation Mode (EXC bit = 0), F1 = F0 = 0.
CS5516, CS5520
DS74F1
11
DS74F2
11


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