Datasheet

38
LTC2400
TYPICAL APPLICATIONS
U
The performance of the LTC2400 can be verified using the
demonstration board DC228, see Figure 42 for the sche-
matic. This circuit uses the computer’s serial port to
generate power and the SPI digital signals necessary for
starting a conversion and reading the result. It includes a
Labview application software program (see Figure 43)
which graphically captures the conversion results. It can
be used to determine noise performance, stability, and
with an external source, linearity. As exemplified in the
schematic, the LTC2400 is extremely easy to use. This
demonstration board and associated software is available
by contacting Linear Technology.
1
J5
DB9
6
9
2
7
3
8
4
5
+
U3-6
74HC14
U3-5
74HC14
R2
51k
CSRTS
2400 F42
NOTES: UNLESS OTHERWISE SPECIFIED
INSTALL SHUNTS ON PIN 2 AND 3 OF JP1 AND JP2
U3-2
74HC14
U3-1
74HC14
R1
51k
R3
100Ω
J6
EXT V
+
8V TO 15V
D1
BAV74LT1
C4
0.1µF
JP1
8
7
6
5
1
2
3
4
C5
100µF
16V
C6
22µF
C3
10µF
C1
10µF
C2
10µF
J4
GROUND
J3
INPUT
J1
V
REFIN
J2
V
REFOUT
SCLKDTR
U3-4
74HC14
U3-3
74HC14
DOUTCTS
OUT IN
GND
U2
LT1236ACS8-5
5V
V
CC
V
REF
V
IN
GND
F
O
SCK
SDO
CS
U1
LTC2400
231 2 3 60Hz50Hz
62
4
43
98
12 13 10 11
56
21
1
JP2 ONBOARD
REF
EXTERNAL
REF
Figure 42. 24-Bit A/D Demo Board Schematic
Figure 43. Display Graphic