參數(shù)資料
型號(hào)： 2495
廠商： Linear Technology Corporation
英文描述： 16-Bit 8-/16-Channel ツヒ ADC with PGA, Easy Drive and I2C Interface
中文描述： 16位8-/16-ChannelツヒADC，帶PGA巡回賽，輕松驅(qū)動(dòng)和I2C接口
文件頁(yè)數(shù)： 10/32頁(yè)
文件大小： 558K
代理商： 2495
LTC2495
10
2495f
GND (Pins 1, 4, 6, 31, 32, 33, 34):
Ground. Multiple
ground pins internally connected for optimum ground cur-
rent flow and V
CC
decoupling. Connect each one of these
pins to a common ground plane through a low impedance
connection. All seven pins must be connected to ground
for proper operation.
SCL (Pin 2):
Serial Clock Pin of the I
2
C Interface. The
LTC2495 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 3):
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.
NC (Pin 5):
No Connect. This pin can be left floating or
tied to GND.
COM (Pin 7):
The Common Negative Input (IN
–
) for All
Single-Ended Multiplexer Configurations. The voltage on
CH0-CH15 and COM pins can have any value between
GND – 0.3V to V
CC
+ 0.3V. Within these limits, the two
selected inputs (IN
+
and IN
–
) provide a bipolar input range
V
IN
= (IN
+
– IN
–
) from –0.5 V
REF
/Gain to 0.5 V
REF
/Gain.
Outside this input range, the converter produces unique
over-range and under-range output codes.
CH0 to CH15 (Pin 8-Pin 23):
Analog Inputs. May be pro-
grammed for single-ended or differential mode.
MUXOUTP (Pin 24):
Positive Multiplexer Output. Connect
to the input of external buffer/amplifier or short directly
to ADCINP.
ADCINP (Pin 25):
Positive ADC Input. Connect to the
output of a buffer/amplifier driven by MUXOUTP or short
directly to MUXOUTP.
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)
FREQUENCY AT V
CC
(Hz)
1
0
–20
–40
–60
–80
–100
–120
–140
1k
100k
2495 G36
10
100
10k
1M
R
V
= 4.1V DC
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
2495 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
2495 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
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