參數(shù)資料
型號(hào): LTC2435-1
廠商: Linear Technology Corporation
英文描述: 20-Bit No Latency ADCs with Differential Input and Differential Reference
中文描述: 20位無(wú)與差分輸入和差分ADC的參考延遲
文件頁(yè)數(shù): 15/40頁(yè)
文件大小: 463K
代理商: LTC2435-1
LTC2435/LTC2435-1
15
24351fa
Table 2. LTC2435/LTC2435-1 Output Data Format
Differential Input Voltage
V
IN
*
V
IN
*
0.5 V
REF
**
0.5 V
REF
** – 1LSB
0.25 V
REF
**
0.25 V
REF
** – 1LSB
0
–1LSB
Bit 23
EOC
0
0
Bit 22
DMY
0
0
Bit 21
SIG
1
1
Bit 20
MSB
1
0
Bit 19
Bit 18
Bit 17
Bit 0
0
1
0
1
0
1
0
1
0
0
0
0
1
1
0
0
1
0
0
1
0
1
0
1
0
0
0
0
1
0
0
1
0
1
0
1
0
1
0
1
–0.25 V
REF
**
–0.25 V
REF
** – 1LSB
–0.5 V
REF
**
V
IN
* < –0.5 V
REF
**
*The differential input voltage V
IN
= IN
+
– IN
.
0
0
0
0
0
0
1
1
1
0
0
1
0
1
0
1
0
0
0
0
0
0
1
0
0
1
0
1
0
1
0
1
**The differential reference voltage V
REF
= REF
+
– REF
.
Figure 3. Output Data Timing
APPLICATIU
tional to V
CC
(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
W
U
U
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 V
CC
Figure 5. Offset vs Temperature
Figure 6. Offset vs V
CC
(V
REF
= V
CC
the offset in ppm is inverse proportional to reference
voltage. As a result, by tying V
CC
to V
REF
, 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 (F
O
)
V
CC
(V)
2.5
3.0
O
R
)
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
V
IN
= 0V
V
INCM
= GND
F
O
T
A
= 25
°
C
TEMPERATURE (
°
C)
–45 –30
0
O
R
)
–15
15
30
90
2435 F05
45
60
75
–324
–325
–326
–327
–328
–329
–330
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
V
INCM
= GND
F
O
V
CC
and V
REF
(V)
2.5
3.0
O
R
)
3.5
4.5
4.0
5.0
5.5
2435 F06
–300
–305
–310
–315
–320
–325
–330
–335
–340
–345
–350
REF
+
= V
CC
REF
= GND
V
IN
= 0V
V
INCM
= GND
F
O
= GND
T
A
= 25
°
C
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