LTC2487 Linear Technology, LTC2487 Datasheet - Page 10

• Manufacturer Part Number: LTC2487
• Description: 16-Bit 2-/4-Channel ADC
• Manufacturer: Linear Technology

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LTC2487
Typical perForMance characTerisTics
pin FuncTions
F
the internal conversion clock rate. When F
to GND, the converter uses its internal oscillator running at
307.2kHz. The conversion clock may also be overridden by
driving the F
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
SCL (Pin 4): Serial Clock Pin of the I
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.
0
O
–100
–120
–140
(Pin 1): Frequency Control Pin. Digital input that controls
–20
–40
–60
–80
0
1
PSRR vs Frequency at V
(2x Speed Mode)
V
REF
REF
IN
IN
F
T
O
A
CC
+
–
= GND
= 25°C
+
–
= GND
= GND
= 4.1V DC ±0.7V
10
= 2.5V
= GND
O
FREQUENCY AT V
pin with an external clock in order to change
100
1k
CC
10k
(Hz)
CC
100k
2487 G36
1M
2
C address.
2
C Interface. The
O
–100
–140
–120
–20
–40
–60
–80
is connected
0
0
PSRR vs Frequency at V
(2x Speed Mode)
V
REF
REF
IN
IN
F
T
O
A
CC
+
–
20
= GND
= 25°C
+
–
= GND
= GND
= 4.1V DC ±1.4V
= 2.5V
= GND
40 60
FREQUENCY AT V
80
100
SDA (Pin 5): Bidirectional Serial Data Line of the I
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
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
Single-Ended Multiplexer Configurations. The voltage
on CH0-CH3 and COM pins can have any value between
GND – 0.3V to V
120
140
CC
(Hz)
160
CC
180
200
2487 G37
220
CC
+ 0.3V. Within these limits, the two
–100
–120
–140
–20
–40
–60
–80
30600
0
PSRR vs Frequency at V
(2x Speed Mode)
V
REF
REF
IN
IN
F
T
O
A
CC
+
–
= GND
= 25°C
+
–
= GND
= GND
= 4.1V DC ±0.7V
= 2.5V
= GND
30650
FREQUENCY AT V
30700
CC
CC
) during the
(Hz)
30750
CC
–
2
) for All
C Inter-
2487 G38
2487fa
30800