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LTC2435IGN Scheda tecnica(PDF) 15 Page - Linear Technology

Il numero della parte LTC2435IGN
Spiegazioni elettronici  20-Bit No Latency ADCs with Differential Input and Differential Reference
PDF  40 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LTC2435IGN Scheda tecnica(HTML) 15 Page - Linear Technology

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LTC2435/LTC2435-1
15
24351fa
Table 2. LTC2435/LTC2435-1 Output Data Format
Differential Input Voltage
Bit 23
Bit 22
Bit 21
Bit 20
Bit 19
Bit 18
Bit 17
…
Bit 0
VIN*
EOC
DMY
SIG
MSB
VIN* ≥ 0.5 • VREF**
0
0110
0
0
…
0
0.5 • VREF** – 1LSB
0
0101
1
1
…
1
0.25 • VREF**
0
0101
0
0
…
0
0.25 • VREF** – 1LSB
0
0100
1
1
…
1
0
0
0100
0
0
…
0
–1LSB
0
0011
1
1
…
1
– 0.25 • VREF**
0
0011
0
0
…
0
– 0.25 • VREF** – 1LSB
0
0010
1
1
…
1
– 0.5 • VREF**
0
0010
0
0
…
0
VIN* < –0.5 • VREF**
0
0001
1
1
…
1
*The differential input voltage VIN = IN
+ – IN–.
**The differential reference voltage VREF = REF
+ – REF–.
Figure 3. Output Data Timing
APPLICATIO S I FOR ATIO
MSB
SIG
“0”
BIT 0
BIT 19
BIT 5
LSB
BIT 20
BIT 21
BIT 22
SDO
SCK
CS
EOC
BIT 23
SLEEP
DATA OUTPUT
CONVERSION
2435 F03
Hi-Z
Figure 4. Offset vs VCC
Figure 5. Offset vs Temperature
Figure 6. Offset vs VCC (VREF = VCC)
tional to VCC (see Figure 4), several characteristics of this
variation can be used to eliminate the effects. First, the
variation with respect to supply voltage is linear. Second,
the magnitude of the offset error decreases with de-
creased supply voltage. Third, the offset error in micro-
volts is almost independent with reference and therefore
the offset in ppm is inverse proportional to reference
voltage. As a result, by tying VCC to VREF, the variation with
supply can be reduced, see Figure 6. The variation with
supply is less than 15ppm over the entire 2.7V to 5.5V
supply range.
Frequency Rejection Selection LTC2435 (FO)
VCC (V)
2.5
3.0
3.5
4.5
4.0
5.0
5.5
2435 F04
–350
–400
–450
–500
–550
–600
–650
–700
–750
REF+ = 2.5V
REF– = GND
VIN = 0V
VINCM = GND
FO = GND
TA = 25°C
TEMPERATURE (°C)
–45 –30
0
–15
15
30
90
2435 F05
45
60
75
–324
–325
–326
–327
–328
–329
–330
VCC = 5V
VREF = 5V
VIN = 0V
VINCM = GND
FO = GND
VCC and VREF (V)
2.5
3.0
3.5
4.5
4.0
5.0
5.5
2435 F06
–300
–305
–310
–315
–320
–325
–330
–335
–340
–345
–350
REF+ = VCC
REF– = GND
VIN = 0V
VINCM = GND
FO = GND
TA = 25°C
–



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