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參數(shù)資料
| 型號： | DC1525A-F |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 15/34頁 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO 25MSPS LTC2170-14 |
| 軟件下載： | QuikEval II System |
| 設(shè)計資源： | DC1525A Design Files |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
| 相關(guān)產(chǎn)品： | DC1371A-ND - BOARD USB DATA ACQUISITION HS |
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LTC2172-14/
LTC2171-14/LTC2170-14
22
21721014fb
applicaTions inForMaTion
Reference
TheLTC2172-14/LTC2171-14/LTC2170-14hasaninternal
1.25V voltage reference. For a 2V input range using the
internal reference, connect SENSE to VDD. For a 1V input
range using the internal reference, connect SENSE to
ground. For a 2V input range with an external reference,
apply a 1.25V reference voltage to SENSE (Figure 9).
The input range can be adjusted by applying a voltage to
SENSE that is between 0.625V and 1.30V. The input range
will then be 1.6 VSENSE.
The reference is shared by all four ADC channels, so it is
not possible to independently adjust the input range of
individual channels.
The VREF, REFH and REFL pins should be bypassed, as
shown in Figure 8. The 0.1F capacitor between REFH and
REFL should be as close to the pins as possible (not on
the backside of the circuit board).
Encode Input
The signal quality of the encode inputs strongly affects
the A/D noise performance. The encode inputs should
be treated as analog signals—do not route them next to
digital traces on the circuit board. There are two modes
of operation for the encode inputs: the differential encode
mode (Figure 10), and the single-ended encode mode
(Figure 11).
Figure 8. Reference Circuit
Figure 9. Using an External 1.25V Reference
Figure 10. Equivalent Encode Input Circuit
for Differential Encode Mode
Figure 11. Equivalent Encode Input Circuit
for Single-Ended Encode Mode
VREF
REFH
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO GND FOR 1V RANGE;
RANGE = 1.6 VSENSE FOR
0.625V < VSENSE < 1.300V
1.25V
REFL
0.1F
2.2F
INTERNAL ADC
HIGH REFERENCE
BUFFER
5
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1F
0.1F
LTC2172-14
217214 F08
SENSE
1.25V
EXTERNAL
REFERENCE
1F
VREF
217214 F09
LTC2172-14
VDD
LTC2172-14
217214 F10
ENC–
ENC+
15k
VDD
DIFFERENTIAL
COMPARATOR
30k
ENC+
ENC–
217214 F11
0V
1.8V TO 3.3V
LTC2172-14
CMOS LOGIC
BUFFER
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