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LTC2421IMS Datasheet(PDF) 9 Page - Linear Technology

Part # LTC2421IMS
Description  1-/2-Channel 20-Bit UPower No Latency ADCs in MSOP-10
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2421IMS Datasheet(HTML) 9 Page - Linear Technology

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9
LTC2421/LTC2422
24212f
PIN FUNCTIONS
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.
FO (Pin 10): Frequency Control Pin. Digital input that
controls the ADC’s notch frequencies and conversion
time. When the FO pin is connected to VCC (FO = VCC), the
converter uses its internal oscillator and the digital filter’s
first null is located at 50Hz. When the FO pin is connected
to GND (FO = 0V), the converter uses its internal oscillator
and the digital filter’s first null is located at 60Hz. When FO
is driven by an external clock signal with a frequency fEOSC,
the converter uses this signal as its clock and the digital
filter first null is located at a frequency fEOSC/2560.
FUNCTIONAL BLOCK DIAGRA
TEST CIRCUITS
3.4k
SDO
24212 TC01
Hi-Z TO VOH
VOL TO VOH
VOH TO Hi-Z
CLOAD = 20pF
3.4k
SDO
24212 TC02
Hi-Z TO VOL
VOH TO VOL
VOL TO Hi-Z
CLOAD = 20pF
VCC
AUTOCALIBRATION
AND CONTROL
DAC
DECIMATING FIR
INTERNAL
OSCILLATOR
SERIAL
INTERFACE
ADC
∑
∫
∫
∫
GND
VCC
VIN
SDO
SCK
VREF
CS
FO
(INT/EXT)
24212 FD


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