ltc2440cgn-trpbf Linear Technology Corporation, ltc2440cgn-trpbf Datasheet - Page 14

• Manufacturer Part Number: ltc2440cgn-trpbf
• Description: 24-bit High Speed Differential Delta Sigma Adc With Selectable Speed/resolution
• Manufacturer: Linear Technology Corporation

LTC2440
APPLICATIONS INFORMATION
Table 4. LTC2440 Interface Timing Modes
Confi guration
External SCK, Single Cycle Conversion
External SCK, 2-Wire I/O
Internal SCK, Single Cycle Conversion
Internal SCK, 2-Wire I/O, Continuous Conversion
14
Table 3. SDI Speed/Resolution Programming
**Address allows tying SDI HIGH *Additional address to allow tying SDI LOW
OSR4
BUSY
X
X
X
X
X
X
X
X
X
X
SDO
0
SCK
SDI
CS
*OSR4 BIT MUST BE AT FIRST SCK RISING EDGE DURING SERIAL DATA OUT CYCLE
OSR3
Hi-Z
0
0
0
0
0
0
0
0
1
1
1
OSR2
0
0
0
0
1
1
1
1
0
0
1
BIT 31
OSR4*
EOC
OSR1
0
1
0
1
0
0
1
1
0
0
1
BIT 30
OSR3
“0”
Figure 4. SDI Speed/Resolution Programming
OSR0
1
0
0
1
0
1
0
1
0
1
1
OSR2
BIT 29
SIG
External
External
Internal
Internal
Source
SCK
9MHz CLOCK
BIT 28
OSR1
MSB
INTERNAL
13.75Hz
6.875Hz
3.52kHz
1.76kHz
27.5Hz
880Hz
880Hz
440Hz
220Hz
110Hz
55Hz
CONVERSION RATE
BIT 27
OSR0
CS and SCK
Conversion
Continuous
BIT 26
Control
Cycle
10.24MHz CLOCK
SCK
CS
EXTERNAL
15.625Hz
7.8125Hz
31.25Hz
↑
62.5Hz
500Hz
250Hz
125Hz
4kHz
2kHz
1kHz
1kHz
BIT 25
BIT 1
NOISE
750nV
510nV
375nV
250nV
200nV
3.5μV
1.4μV
CS and SCK
23μV
RMS
2μV
2μV
1μV
Control
Internal
Output
Data
SCK
CS
BIT 0
LSB
↑
ENOB
21.3
21.3
21.8
22.4
22.9
23.4
24.4
24.6
17
20
24
2440 F04
Hi-Z
32768**
16384
256*
1024
2048
4096
8192
OSR
128
256
512
64
Waveforms
Figures 5, 6
Figures 8, 9
Connection
Figure 10
Figure 7
and
2440fc