LTC2420 Linear Technology, LTC2420 Datasheet - Page 7

• Manufacturer Part Number: LTC2420
• Description: 20-Bit uPower No Latency ADC in SO-8
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
1
2
3
4
Figure 3. Selectable 100 Samples/Second Turbo Mode
Table 2. LTC2420 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 sign bit changes state during the 0 code.
V
V
V
GND
IN
REF
REF
+
IN
CC
REF
IN
/0
LTC2420
> 9/8 • V
< –1/8 • V
–
REF
REF
REF
REF
REF
REF
+ 1LSB
REF
REF
+ 1LSB
+ 1LSB
+ 1LSB
SDO
SCK
SDO
SCK
CS
F
CS
REF
O
INTERNAL 153.6kHz OSCILLATOR
REF
8
7
6
5
U
Hi-Z
SLEEP
Bit 23
EOC
EXTERNAL 2.048MHz CLOCK SOURCE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
U
BIT 23
800Hz NOTCH (100 SAMPLES/SECOND)
60Hz NOTCH (7.5 SAMPLES/SECOND)
EOC
1
Bit 22
DMY
BIT 22
0
0
0
0
0
0
0
0
0
0
0
0
0
0
“0”
W
2
Bit 21
1/0*
SIG
1
1
1
1
1
1
1
1
1
1
0
0
0
BIT 21
SIG
Figure 2. Output Data Timing
3
U
Bit 20
EXR
2420 F03
1
1
1
0
0
0
0
0
0
0
0
1
1
1
BIT 20
EXT
4
DATA OUTPUT
Bit 19
MSB
0
0
0
1
1
1
1
0
0
0
0
1
1
1
BIT 19
MSB
5
Bit 18
0
0
0
1
1
0
0
1
1
0
0
1
1
1
Figure 4. Total Error vs Output Rate (V
128
256
224
192
160
96
64
32
19
0
Bit 17
0
V
0
0
0
1
0
1
0
1
0
1
0
1
1
1
REF
BIT 4
= 5V
OUTPUT RATE (SAMPLES/SEC)
20
Bit 16
50
1
1
0
1
0
1
0
1
0
1
0
1
0
0
LSB
BIT 0
20
24
Bit 15
1
1
0
1
0
1
0
1
0
1
0
1
0
0
100
CONVERSION
12 BITS
13 BITS
14 BITS
16 BITS
…
...
...
...
...
...
...
...
...
...
...
...
...
...
...
2420 F04
2420 F02
LTC2420
REF
150
= 5V)
Bit 0
LSB
1
1
0
1
0
1
0
1
0
1
0
1
0
0
7