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參數(shù)資料
| 型號： | LTC2494IUHF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 16-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC38 |
| 封裝： | 5 X 7 MM, PLASTIC, MO-220WKHD, QFN-38 |
| 文件頁數(shù)： | 3/36頁 |
| 文件大?。?/td> | 675K |
| 代理商： | LTC2494IUHF |
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LTC2494
2494fa
FuncTional block Diagram
Figure 1. Functional Block Diagram
pin FuncTions
FO (Pin 35): Frequency Control Pin. Digital input that
controls the internal conversion clock rate. When FO is
connected to GND, the converter uses its internal oscil-
lator running at 307.2kHz. The conversion clock may
also be overridden by driving the FO pin with an external
clock in order to change the output rate and the digital
filter rejection null.
CS (Pin 36): Active LOW Chip Select. A LOW on this pin
enables the digital input/output and wakes up the ADC.
Following each conversion, the ADC automatically enters
the Sleep mode and remains in this low power state as
long as CS is HIGH. A LOW-to-HIGH transition on CS
during the Data Output aborts the data transfer and starts
a new conversion.
SDO (Pin 37): Three-State Digital Output. During the data
output period, this pin is used as the serial data output.
When the chip select pin is HIGH, the SDO pin is in a high
impedancestate.Duringtheconversionandsleepperiods,
this pin is used as the conversion status output. When
the conversion is in progress this pin is HIGH; once the
conversion is complete SDO goes low. The conversion
status is monitored by pulling CS LOW.
SCK(Pin38):Bidirectional,DigitalI/O,ClockPin.InInternal
Serial Clock Operation mode, SCk is generated internally
and is seen as an output on the SCk pin . In External Serial
Clock Operation mode, the digital I/O clock is externally
applied to the SCk pin. The Serial Clock operation mode
is determined by the logic level applied to the SCk pin at
power up and during the most recent falling edge of CS.
Exposed Pad (Pin 39): Ground. This pin is ground and
mustbesolderedtothePCBgroundplane.Forprototyping
purposes, this pin may remain floating.
AUTOCALIBRATION
AND CONTROL
DIFFERENTIAL
3RD ORDER
Σ MODULATOR
DECIMATING FIR
ADDRESS
INTERNAL
OSCILLATOR
SERIAL
INTERFACE
GND
VCC
CH0
CH1
CH15
COM
MUX
MUXOUTP
MUXOUTN
ADCINP
ADCINN
SDO
SCK
REF+
REF–
CS
SDI
FO
(INT/EXT)
2494 BD
+
–
TEMP
SENSOR
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