參數(shù)資料
型號(hào): LTC2480
廠(chǎng)商: Linear Technology Corporation
英文描述: 16-Bit ADC with Easy Drive
中文描述: 16位ADC的易道
文件頁(yè)數(shù): 11/40頁(yè)
文件大小: 535K
代理商: LTC2480
11
LTC2480
2480f
PIU
as CS is HIGH. A LOW-to-HIGH transition on CS during the
Data Output transfer aborts the data transfer and starts a
new conversion.
SDO (Pin 7):
Three-State Digital Output. During the Data
Output period, this pin is used as the serial data output.
When the chip select CS is HIGH (CS = V
CC
), the SDO pin
is in a high impedance state. During the Conversion and
Sleep periods, this pin is used as the conversion status
output. The conversion status can be observed by pulling
CS LOW.
GND (Pin 8):
Ground. Shared pin for analog ground,
digital ground and reference ground. Should be connected
directly to a ground plane through a minimum impedance.
SCK (Pin 9):
Bidirectional Digital Clock Pin. In Internal
Serial Clock Operation mode, SCK is used as the digital
output for the internal serial interface clock during the Data
Input/Output period. In External Serial Clock Operation
mode, SCK is used as the digital input for the external
serial interface clock during the Data Output period. A weak
internal pull-up is automatically activated in Internal Serial
Clock Operation mode. The Serial Clock Operation mode is
determined by the logic level applied to the SCK pin at
power up or during the most recent falling edge of CS.
F
O
(Pin 10):
Frequency Control Pin. Digital input that
controls the conversion clock. When F
O
is connected to
GND the converter uses its internal oscillator running at
307.2kHz. The conversion clock may also be overridden
by driving the F
O
pin with an external clock in order to
change the output rate or the digital filter rejection null.
Exposed Pad (Pin 11):
This pin is ground and should be
soldered to the PCB ground plane. For prototyping pur-
poses, this pin may remain floating.
W
FU
TEST CIRCUITS
1
9
4
5
7
6
10
3RD ORDER
Σ
ADC
REF
+
IN
+
IN
+
3
V
REF
IN
IN
REF
(1-256)
GAIN
SERIAL
INTERFACE
TEMP
SENSOR
MUX
SDI
2
V
CC
8
GND
CS
F
O
2480 FD
SCK
SD0
AUTOCALIBRATION
AND CONTROL
INTERNAL
OSCILLATOR
1.69k
SDO
2480 TA02
Hi-Z TO V
OH
V
OL
TO V
V
OH
TO Hi-Z
C
LOAD
= 20pF
1.69k
SDO
2480 TA03
Hi-Z TO V
OL
V
OH
TO V
OL
V
OL
TO Hi-Z
C
LOAD
= 20pF
V
CC
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