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參數資料
型號: DC1525A-B
廠商: Linear Technology
文件頁數: 14/34頁
文件大小: 0K
描述: BOARD DEMO 105MSPS LTC2174-14
軟件下載: QuikEval II System
設計資源: DC1525A Design Files
標準包裝: 1
系列: *
相關產品: DC1371A-ND - BOARD USB DATA ACQUISITION HS
21
21754314fa
LTC2175-14/
LTC2174-14/LTC2173-14
applicaTions inForMaTion
Figure 8. Reference Circuit
Figure 9. Using an External 1.25V Reference
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
Figure 10. Equivalent Encode Input Circuit for
Differential Encode Mode
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).
VREF
REFH
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO GND FOR 1V RANGE;
RANGE = 1.6 VSENSE FOR
0.65V < VSENSE < 1.300V
1.25V
REFL
0.1F
2.2F
INTERNAL ADC
HIGH REFERENCE
BUFFER
217514 F08
LTC2175-14
5
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1F
0.1F
SENSE
1.25V
EXTERNAL
REFERENCE
1F
VREF
217514 F09
LTC2175-14
VDD
LTC2175-14
217514 F10
ENC
ENC+
15k
VDD
DIFFERENTIAL
COMPARATOR
30k
ENC+
ENC
217514 F11
0V
1.8V TO 3.3V
LTC2175-14
CMOS LOGIC
BUFFER
Figure 11. Equivalent Encode Input Circuit for
Single-Ended Encode Mode
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