LTC2418CGN Linear Technology, LTC2418CGN Datasheet - Page 40

• Manufacturer Part Number: LTC2418CGN
• Description: IC ADC 24BIT DIFF INPUT 28SSOP
• Manufacturer: Linear Technology

Specifications of LTC2418CGN

• Number Of Bits: 24
• Sampling Rate (per Second): 7.5
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 1mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP (0.150", 3.95mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC2414/LTC2418
APPLICATIO S I FOR ATIO
The error associated with the 10V excitation would be
–80ppm. Hence, overall reference error could be as high
as 130ppm, the average of the two.
Figure 47 shows a similar scheme to provide excitation
using resistor arrays to produce precise gain. The circuit
40
BRIDGE
350Ω
2N3904
33Ω
10V
Q1
–15V
15V
U
–10V
33Ω
Q2
2N3906
20Ω
20Ω
1k
1k
U
Figure 46. LTC1043 Provides Precise 4X Reference for Excitation Voltages
6
6
0.1µF
0.1µF
LTC1150
LTC1150
W
–15V
–15V
15V
7
4
15V
7
4
+
–
+
–
3
2
3
2
1µF
U
FILM
10V
1µF
–10V
200Ω
200Ω
14
8
is configured to provide 10V and –5V excitation to the
bridge, producing a common mode voltage at the input to
the LTC2414/LTC2418 of 2.5V, maximizing the AC input
range for applications where induced 60Hz could reach
amplitudes up to 2V
15
14
U1
LTC1043
5
8
11
12
U2
LTC1043
U2
LTC1043
11
12
2
3
*
15V
*
*
–10V
4
17
5V
4
17
7
13
6
18
7
13
47µF
0.1µF
10µF
RMS
*FLYING CAPACITORS ARE
1µF FILM (MKP OR EQUIVALENT)
SEE LTC1043 DATA SHEET FOR
DETAILS ON UNUSED HALF OF U1
+
5V
11
12
21
22
.
REF
REF
CH0
CH1
LT1236-5
LTC2414/
LTC2418
+
–
GND
V
CC
9
15
2410 F52
0.1µF
10V
5V
241418fa