參數(shù)資料
型號(hào)： DC575A
廠商： Linear Technology
文件頁(yè)數(shù)： 16/48頁(yè)
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2410
軟件下載： QuikEval System
設(shè)計(jì)資源： DC575A Design File
DC575A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 2
位數(shù)： 24
采樣率（每秒）： 7.5
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2410
已供物品： 板
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LTC2410IGN#PBF-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410CGN#TRPBF-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410IGN#TRPBF-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410CGN#PBF-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410CGN#TR-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410IGN#TR-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
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LTC2410CGN-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410
23
APPLICATIO S I FOR ATIO
WU
U
CS is discharging; therefore, the internal serial clock
timing mode is automatically selected if SCK is floating. It
is important to ensure there are no external drivers pulling
SCK LOW while CS is discharging.
PRESERVING THE CONVERTER ACCURACY
The LTC2410 is designed to reduce as much as possible
the conversion result sensitivity to device decoupling,
PCB layout, antialiasing circuits, line frequency perturba-
tions and so on. Nevertheless, in order to preserve the
extreme accuracy capability of this part, some simple
precautions are desirable.
Digital Signal Levels
The LTC2410’s digital interface is easy to use. Its digital
inputs (FO, CS and SCK in External SCK mode of operation)
accept standard TTL/CMOS logic levels and the internal
hysteresis receivers can tolerate edge rates as slow as
100
s.However,someconsiderationsarerequiredtotake
advantage of the exceptional accuracy and low supply
current of this converter.
The digital output signals (SDO and SCK in Internal SCK
mode of operation) are less of a concern because they are
not generally active during the conversion state.
While a digital input signal is in the range 0.5V to
(VCC – 0.5V), the CMOS input receiver draws additional
current from the power supply. It should be noted that,
when any one of the digital input signals (FO, CS and SCK
in External SCK mode of operation) is within this range, the
LTC2410 power supply current may increase even if the
signal in question is at a valid logic level. For micropower
operation, it is recommended to drive all digital input
signals to full CMOS levels [VIL < 0.4V and VOH >
(VCC – 0.4V)].
During the conversion period, the undershoot and/or
overshoot of a fast digital signal connected to the LTC2410
pins may severely disturb the analog to digital conversion
process. Undershoot and overshoot can occur because of
the impedance mismatch at the converter pin when the
transition time of an external control signal is less than
twice the propagation delay from the driver to LTC2410.
For reference, on a regular FR-4 board, signal propagation
Figure 12. CS Capacitance vs tSAMPLE
Figure 13. CS Capacitance vs Output Rate
Figure 14. CS Capacitance vs Supply Current
CAPACITANCE ON CS (pF)
1
5
6
7
1000
10000
2400 F12
4
3
10
100
100000
2
1
0
t SAMPLE
(SEC)
VCC = 5V
VCC = 3V
CAPACITANCE ON CS (pF)
0
SAMPLE
RATE
(Hz)
3
4
5
1000
100000
2400 F13
2
1
0
10
100
10000
6
7
8
VCC = 5V
VCC = 3V
CAPACITANCE ON CS (pF)
1
0
SUPPLY
CURRENT
(
A
RMS
)
50
100
150
200
250
300
10
100
1000
10000
2400 F14
100000
VCC = 5V
VCC = 3V
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