LTC2447IUHF#PBF Linear Technology, LTC2447IUHF#PBF Datasheet - Page 23

• Manufacturer Part Number: LTC2447IUHF#PBF
• Description: IC ADC 24BIT 8CH HI SPEED 38QFN
• Manufacturer: Linear Technology

Specifications of LTC2447IUHF#PBF

• Number Of Bits: 24
• Sampling Rate (per Second): 8k
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 40mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 38-WFQFN, Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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