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參數(shù)資料
| 型號： | LTC2487 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2-/4-Channel ADC with PGA, Easy Drive and I2C Interface |
| 中文描述： | 16位2-/4-Channel型ADC PGA巡回賽，輕松驅動和I2C接口 |
| 文件頁數(shù)： | 10/32頁 |
| 文件大小： | 612K |
| 代理商： | LTC2487 |
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LTC2487
0
2487fa
FREQUENCY AT V
CC
(Hz)
1
0
–20
–40
–60
–80
–100
–120
–140
1k
100k
2487 G36
10
100
10k
1M
R
V
= 4.1V DC
±
0.7V
REF
+
= 2.5V
REF
–
= GND
IN
+
= GND
IN
–
= GND
F
O
= GND
T
A
= 25
°
C
FREQUENCY AT V
CC
(Hz)
0
–140
R
–120
–80
–60
–40
0
20
100
140
2487 G37
–100
–20
80
180
220
200
40 60
120
160
V
CC
= 4.1V DC
±
1.4V
REF
+
= 2.5V
REF
–
= GND
IN
+
= GND
IN
–
= GND
F
O
= GND
T
A
= 25
°
C
FREQUENCY AT V
CC
(Hz)
30600
–60
–40
0
30750
2487 G38
–80
–100
30650
30700
30800
–120
–140
–20
R
V
= 4.1V DC
±
0.7V
REF
+
= 2.5V
REF
–
= GND
IN
+
= GND
IN
–
= GND
F
O
= GND
T
A
= 25
°
C
F
O
(Pin 1):
Frequency Control Pin. Digital input that controls
the internal conversion clock rate. 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 and the digital filter rejection null.
CA0, CA1 (Pins 2, 3):
Chip Address Control Pins. These
pins are configured as a three-state (LOW, HIGH, Floating)
address control bits for the device’s I
2
C address.
SCL (Pin 4):
Serial Clock Pin of the I
2
C Interface. The
LTC2487 can only act as a slave and the SCL pin only ac-
cepts an external serial clock. Data is shifted into the SDA
pin on the rising edges of the SCL clock and output through
the SDA pin on the falling edges of the SCL clock.
SDA (Pin 5):
Bidirectional Serial Data Line of the I
2
C Inter-
face. In the transmitter mode (Read), the conversion result
is output through the SDA pin, while in the receiver mode
(Write), the device channel select and configuration bits
are input through the SDA pin. The pin is high impedance
during the data input mode and is an open drain output
(requires an appropriate pull-up device to V
CC
) during the
data output mode.
GND (Pin 6):
Ground. Connect this pin to a common ground
plane through a low impedance connection.
COM (Pin 7):
The Common Negative Input (IN
–
) for All
Single-Ended Multiplexer Configurations. The voltage
on CH0-CH3 and COM pins can have any value between
GND – 0.3V to V
CC
+ 0.3V. Within these limits, the two
Typical perForMance characTerisTics
PSRR vs Frequency at V
CC
(2x Speed Mode)
PSRR vs Frequency at V
CC
(2x Speed Mode)
pin FuncTions
PSRR vs Frequency at V
CC
(2x Speed Mode)
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