LTC2400 Linear Technology, LTC2400 Datasheet - Page 12

• Manufacturer Part Number: LTC2400
• Description: 24-Bit uPower No Latency ADC in SO-8
• Manufacturer: Linear Technology

APPLICATIONS
LTC2400
out on the falling edge of the 31st SCK and may be latched
on the rising edge of the 32nd SCK pulse. On the falling
edge of the 32nd SCK pulse, SDO goes HIGH indicating a
new conversion cycle has been initiated. This bit serves as
EOC (Bit 31) for the next conversion cycle. Table 2 sum-
marizes the output data format.
As long as the voltage on the V
the – 0.3V to (V
range, a conversion result is generated for any input value
from – 0.125 • V
greater than 1.125 • V
Table 2. LTC2400 Output Data Format
Input Voltage
V
9/8 • V
V
V
3/4V
3/4V
1/2V
1/2V
1/4V
1/4V
0
–1LSB
–1/8 • V
V
*The sub LSBs are valid conversion results beyond the 24-bit level that may be included in averaging or discarded without loss of resolution.
**The sign bit changes state during the 0 code.
12
+
IN
REF
REF
IN
/0
> 9/8 • V
< –1/8 • V
–
REF
REF
REF
REF
REF
REF
+ 1LSB
REF
REF
+ 1LSB
+ 1LSB
+ 1LSB
REF
REF
SDO
SCK
CS
CC
REF
+ 0.3V) absolute maximum operating
Bit 31
U
Hi-Z
EOC
SLEEP
0
0
0
0
0
0
0
0
0
0
0
0
0
0
REF
to 1.125 • V
, the conversion result is clamped
INFORMATION
U
BIT 31
EOC
Bit 30
DMY
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
IN
pin is maintained within
REF
BIT 30
“0”
W
Bit 29
1/0**
SIG
. For input voltages
1
1
1
1
1
1
1
1
1
1
0
0
0
2
BIT 29
Bit 28
SIG
EXR
1
1
1
0
0
0
0
0
0
0
0
1
1
1
Figure 3. Output Data Timing
U
3
BIT 28
Bit 27
EXT
MSB
0
0
0
1
1
1
1
0
0
0
0
1
1
1
4
DATA OUTPUT
BIT 27
MSB
Bit 26
to the value corresponding to 1.125 • V
voltages below – 0.125 • V
clamped to the value corresponding to – 0.125 • V
Frequency Rejection Selection (F
The LTC2400 internal oscillator provides better than 110dB
normal mode rejection at the line frequency and all its
harmonics for 50Hz 2% or 60Hz 2%. For 60Hz rejec-
tion, F
for 50Hz rejection the F
(Pin 1).
0
0
0
1
1
0
0
1
1
0
0
1
1
1
5
O
Bit 25
(Pin 8) should be connected to GND (Pin 4) while
0
0
0
1
0
1
0
1
0
1
0
1
1
1
27
LSB
Bit 24
BIT 4
1
1
0
1
0
1
0
1
0
1
0
1
0
0
24
28
O
Bit 23
BIT 0
pin should be connected to V
1
1
0
1
0
1
0
1
0
1
0
1
0
0
32
REF
, the conversion result is
CONVERSION
…
...
...
...
...
...
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...
...
...
...
...
...
...
O
Pin Connection)
2400 F03
Bit 4
LSB
REF
1
1
0
1
0
1
0
1
0
1
0
1
0
0
. For input
SUB LSBs*
Bit 3-0
REF
X
X
X
X
X
X
X
X
X
X
X
X
X
X
.
CC