LTC2446 LINER [Linear Technology], LTC2446 Datasheet - Page 23
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LTC2446
Manufacturer Part Number
LTC2446
Description
24-Bit High Speed 8-Channel ?? ADCs with Selectable Multiple Reference Inputs
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC2446.pdf
(28 pages)
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APPLICATIO S I FOR ATIO
V
V
I
V
V
I
REF
REF
REF
I
I
REF
IN
IN
IN
IN
+
+
–
–
+
+
–
–
V
V
CC
CC
Figure 16. LTC2446 Input Structure
V
I
I
V
I
I
LEAK
LEAK
LEAK
LEAK
CC
CC
I
I
LEAK
LEAK
I
I
LEAK
LEAK
U
RATIOMETRIC
Figure 15. Versatile 4-Way Multiplexer Measures Multiple Ratiometric/Absolute Sensors
ABSOLUTE
MUX
MUX
vs V
SWITCHING FREQUENCY
f
f
SW
SW
R
R
R
R
U
REFG
SW
SW
SW
SW
500Ω
500Ω
500Ω
500Ω
= 1.8MHz INTERNAL OSCILLATOR
= f
(TYP)
(TYP)
(TYP)
(TYP)
EOSC
BRIDGE
/5 EXTERNAL OSCILLATOR
W
RTD
RTD
24467 F16
C
5pF
(TYP)
(C
SAMPLE CAP
+ PARASITICS)
EQ
EQ
V
REF
= 2pF
U
V
V
V
CH0
CH1
V
V
CH2
CH3
CH4
V
CH5
V
CH6
CH7
COM
V
REFG
REFO1
REFO1
REF23
REF23
REF45
REF45
REFG
+
+
–
+
–
+
–
REF
IN
IN
REF
When using the internal oscillator, f
equivalent resistance is approximately 110kΩ.
Input Bandwidth and Frequency Rejection
The combined effect of the internal SINC
the digital and analog autocalibration circuits determines
the LTC2446/LTC2447 input bandwidth and rejection
characteristics. The digital filter’s response can be ad-
justed by setting the oversample ratio (OSR) through the
SPI interface or by supplying an external conversion clock
to the f
Table 7 lists the properties of the LTC2446/LTC2447 with
various combinations of oversample ratio and clock fre-
quency. Understanding these properties is the key to fine
tuning the characteristics of the LTC2446/LTC2447 to the
application.
+
–
+
–
o
+
–
V
pin.
CC
VARIABLE SPEED
24-BIT ∆Σ ADC
RESOLUTION
10µF
LTC2446/LTC2447
LTC2446
24467 F15
CS
SDI
SDO
SCK
SW
is 1.8MHz and the
4
digital filter and
23
24467fa