Datasheet
LTC2412
11
2412f
TEST CIRCUITS
FU CTIO AL BLOCK DIAGRA
UU
W
Figure 1. Functional Block Diagram
PI FU CTIO S
UUU
F
O
(Pin 14): Frequency Control Pin. Digital input that
controls the ADC’s notch frequencies and conversion
time. When the F
O
pin is connected to V
CC
(F
O
= V
CC
), the
converter uses its internal oscillator and the digital filter
first null is located at 50Hz. When the F
O
pin is connected
to GND (F
O
= OV), the converter uses its internal oscillator
and the digital filter first null is located at 60Hz. When F
O
is driven by an external clock signal with a frequency f
EOSC
,
the converter uses this signal as its system clock and the
digital filter first null is located at a frequency f
EOSC
/2560.
AUTOCALIBRATION
AND CONTROL
DECIMATING FIR
CH0/CH1
INTERNAL
OSCILLATOR
SERIAL
INTERFACE
PING-PONG
DIFFERENTIAL
3RD ORDER
∆Σ MODULATOR
+–
MUX
GND
REF
+
CH0
+
IN
+
IN
–
CH0
–
CH1
+
CH1
–
REF
–
V
CC
SCK
SDO
CS
F
O
(INT/EXT)
2412 FD
1.69k
SDO
2412 TA03
Hi-Z TO V
OH
V
OL
TO V
OH
V
OH
TO Hi-Z
C
LOAD
= 20pF
1.69k
SDO
2412 TA04
Hi-Z TO V
OL
V
OH
TO V
OL
V
OL
TO Hi-Z
C
LOAD
= 20pF
V
CC