LTC2400CS8 Linear Technology, LTC2400CS8 Datasheet - Page 27

• Manufacturer Part Number: LTC2400CS8
• Description: IC A/D CONV 24BIT MICRPWR 8-SOIC
• Manufacturer: Linear Technology

Specifications of LTC2400CS8

• Mfg Application Notes: Application Note
• 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: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TYPICAL APPLICATIONS
Differential to Single-Ended
Analog Conditioning
The circuits in Figures 29 and 30 use the LTC1043 dual
precision, switched capacitor building block. Each circuit
uses one-half of an LTC1043 to perform a differential to
single-ended conversion over an input common mode
range that includes the power supplies. The LTC1043
samples a differential input voltage, holds it on C
transfers it to a ground-referenced capacitor C
voltage on C
converted to a digital value.
The LTC1043 achieves its best differential to single-ended
conversion when its internal switching frequency oper-
ates at a nominal 300Hz, as set by the 0.01 F capacitor C1,
and when 1 F capacitors are used for C
C
polypropylene.
H
should be a film-type capacitor such as mylar or
SDO
SCK
CS1
CS2
CS3
CS4
H
CONTROLLER
is applied to the LTC2400’s input and
SDO
SCK
CS1
CS2
CS3
CS4
V
V
V
GND
CC
REF
IN
31 OR LESS
CLOCK PULSES
LTC2400
#1
U
SDO
SCK
CS
F
O
Figure 28. 4 Output Rate LTC2400 System
S
and C
H
V
V
V
GND
CC
REF
IN
. C
LTC2400
H
#2
S
. The
S
SDO
SCK
and
and
CS
F
O
Simple Differential Front-End
for the LTC2400
The circuit in Figure 29 is ideal for wide dynamic range
differential signals in applications where absolute accu-
racy is secondary to high resolution, have large signal
swings, source impedances under 500 and use a 5V or
The circuit achieves a nonlinearity of 35ppm (a linearity
accuracy of 14.5 bits), noise of 1.5 V
resolution. The circuit exhibits a typical 2.75mV zero
offset. However, this is not an offset that simply shifts the
output code by a constant value. It is a gain error that alters
the transfer function’s slope. The gain error revolves
around midscale (V
in software by measuring the error at 0V input and using
the result to create a correction factor.
5V supply.
V
V
V
GND
CC
REF
IN
LTC2400
#3
SDO
SCK
CS
F
O
REF
V
V
V
GND
CC
REF
IN
LTC2400
/2). This gain error can be corrected
#4
SDO
SCK
CS
F
O
EXTERNAL OSCILLATOR
(153,600HZ)
V
(0.1V TO V
REF
CC
RMS
LTC2400
)
2400 F28
and 21-bit
27