LTC2487
Typical perForMance characTerisTics
PSRR vs Frequency at V
(2x Speed Mode)
PSRR vs Frequency at V
(2x Speed Mode)
PSRR vs Frequency at V
(2x Speed Mode)
CC
CC
CC
0
–20
0
0
V
= 4.1V DC ±1.4V
V
= 4.1V DC ±0.7V
V
= 4.1V DC ±0.7V
CC
CC
CC
+
+
+
REF = 2.5V
REF = 2.5V
REF = 2.5V
–20
–
–
–20
–
REF = GND
REF = GND
REF = GND
IN = GND
+
–
+
–
+
–
IN = GND
IN = GND
–40
–40
IN = GND
IN = GND
–40 IN = GND
F
= GND
= 25°C
F
= GND
= 25°C
F
= GND
O
A
O
A
O
T
T
T
= 25°C
A
–60
–60
–80
–60
–80
–80
–100
–120
–140
–100
–120
–100
–120
–140
–140
10k
FREQUENCY AT V (Hz)
1M
1
10
100
1k
100k
30650
30700
30800
0
60
30600
30750
20 40
80
100 120 140 160 180 200 220
FREQUENCY AT V (Hz)
FREQUENCY AT V (Hz)
CC
CC
CC
2487 G36
2487 G37
2487 G38
pin FuncTions
O
the internal conversion clock rate. When F is connected
2
F (Pin1):FrequencyControlPin.Digitalinputthatcontrols
SDA (Pin 5): Bidirectional Serial Data Line of the I C Inter-
face.Inthetransmittermode(Read),theconversionresult
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
O
toGND,theconverterusesitsinternaloscillatorrunningat
307.2kHz.Theconversionclockmayalsobeoverriddenby
driving the F pin with an external clock in order to change
O
the output rate and the digital filter rejection null.
(requires an appropriate pull-up device to V ) during the
CC
CA0, CA1 (Pins 2, 3): Chip Address Control Pins. These
data output mode.
pinsareconfiguredasathree-state(LOW, HIGH, Floating)
2
address control bits for the device’s I C address.
GND(Pin6):Ground.Connectthispintoacommonground
plane through a low impedance connection.
2
SCL (Pin 4): Serial Clock Pin of the I 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
pinontherisingedgesoftheSCLclockandoutputthrough
the SDA pin on the falling edges of the SCL clock.
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 + 0.3V. Within these limits, the two
CC
2487fa
ꢀ0
Linear [ Linear ]
