LTC2421 LINER [Linear Technology], LTC2421 Datasheet - Page 9

• Manufacturer Part Number: LTC2421
• Description: 1-/2-Channel 20-Bit UPower No Latency ADCs in MSOP-10
• Manufacturer: LINER [Linear Technology]

FUNCTIONAL BLOCK DIAGRA
PIN
SCK (Pin 9): Bidirectional Digital Clock Pin. In the Internal
Serial Clock Operation mode, SCK is used as digital output
for the internal serial interface clock during the data output
period. In the External Serial Clock Operation mode, SCK
is used as digital input for the external serial interface. An
internal pull-up current source is automatically activated
in Internal Serial Clock Operation mode. The Serial Clock
mode is determined by the level applied to SCK at power
up and the falling edge of CS.
TEST CIRCUITS
V
GND
U
V
V
REF
U
CC
IN
FUNCTIONS
U
U
SDO
U
Hi-Z TO V
V
V
3.4k
OL
OH
TO V
TO Hi-Z
DAC
OH
OH
C
LOAD
24212 TC01
= 20pF
W
F
controls the ADC’s notch frequencies and conversion
time. When the F
converter uses its internal oscillator and the digital filter’s
first null is located at 50Hz. When the F
to GND (F
and the digital filter’s first null is located at 60Hz. When F
is driven by an external clock signal with a frequency f
the converter uses this signal as its clock and the digital
filter first null is located at a frequency f
O
(Pin 10): Frequency Control Pin. Digital input that
ADC
O
= 0V), the converter uses its internal oscillator
O
pin is connected to V
AUTOCALIBRATION
DECIMATING FIR
SDO
AND CONTROL
LTC2421/LTC2422
Hi-Z TO V
V
V
OH
OL
V
TO Hi-Z
TO V
CC
3.4k
OL
C
OL
LOAD
24212 TC02
= 20pF
OSCILLATOR
INTERFACE
INTERNAL
O
CC
SERIAL
EOSC
pin is connected
(F
O
/2560.
= V
(INT/EXT)
CC
), the
EOSC
24212 FD
F
SDO
SCK
CS
24212f
9
O
O
,