Datasheet

LTC2415/LTC2415-1
11
sn2415 24151fs
FU CTIO AL BLOCK DIAGRA
UU
W
Figure 1. Functional Block Diagram
AUTOCALIBRATION
AND CONTROL
DAC
DECIMATING FIR
INTERNAL
OSCILLATOR
SERIAL
INTERFACE
ADC
∑
∫∫∫
GND
V
CC
IN
+
IN
–
SDO
SCK
REF
+
REF
–
CS
F
O
(INT/EXT)
2415 FD
–+
+
–
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
(LTC2415 only),
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
(LTC2415) or simultaneous 50Hz/60Hz (LTC2415-1).
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.
PI FU CTIO S
UUU
TEST CIRCUITS
1.69k
SDO
2415 TA03
Hi-Z TO V
OH
V
OL
TO V
OH
V
OH
TO Hi-Z
C
LOAD
= 20pF
1.69k
SDO
2415 TA04
Hi-Z TO V
OL
V
OH
TO V
OL
V
OL
TO Hi-Z
C
LOAD
= 20pF
V
CC