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| 型號(hào)： | LTC2488IDE#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 15/30頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT DELTA SIG 14-DFN |
| 標(biāo)準(zhǔn)包裝： | 91 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 6.9 |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 800µW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 14-DFN-EP（4x3） |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 4 個(gè)單端，雙極；2 個(gè)差分，雙極 |
| 產(chǎn)品目錄頁面： | 1348 (CN2011-ZH PDF) |
| 配用： | DC1009A-B-ND - BOARD DELTA SIGMA ADC LTC2488 |
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LTC2488
22
2488fa
CH3, COM), on the other hand, are typically driven from
larger source resistances. Source resistances up to 10k
may interface directly to the LTC2488 and settle completely;
however, the addition of external capacitors at the input
terminals in order to lter unwanted noise (anti-aliasing)
results in incomplete settling.
Automatic Differential Input Current Cancellation
In applications where the sensor output impedance is
low (up to 10kΩ with no external bypass capacitor or up
to 500Ω with 0.001μF bypass), complete settling of the
input occurs. In this case, no errors are introduced and
direct digitization is possible.
For many applications, the sensor output impedance
combined with external input bypass capacitors produces
RC time constants much greater than the 580ns required
for 1ppm accuracy. For example, a 10kΩ bridge driving a
0.1μF capacitor has a time constant an order of magnitude
greater than the required maximum.
The LTC2488 uses a proprietary switching algorithm that
forces the average differential input current to zero indepen-
dent of external settling errors. This allows direct digitization
of high impedance sensors without the need of buffers.
The switching algorithm forces the average input current
on the positive input (IIN+) to be equal to the average input
current on the negative input (IIN–). Over the complete
conversion cycle, the average differential input current
(IIN+ – IIN–) is zero. While the differential input current is
zero, the common mode input current (IIN+ + IIN–)/2 is
proportional to the difference between the common mode
input voltage (VIN(CM)) and the common mode reference
voltage (VREF(CM)).
In applications where the input common mode voltage is
equal to the reference common mode voltage, as in the
case of a balanced bridge, both the differential and com-
mon mode input currents are zero. The accuracy of the
converter is not compromised by settling errors.
In applications where the input common mode voltage is
constant but different from the reference common mode
voltage, the differential input current remains zero while
the common mode input current is proportional to the
difference between VIN(CM) and VREF(CM). For a reference
common mode voltage of 2.5V and an input common mode
of 1.5V, the common mode input current is approximately
0.74μA. This common mode input current does not degrade
the accuracy if the source impedances tied to IN+ and
APPLICATIONS INFORMATION
Figure 10. LTC2488 Equivalent Analog Input Circuit
IN+
IN–
10k
INTERNAL
SWITCH
NETWORK
10k
CEQ
12pF
10k
IIN
–
REF+
IREF
+
IIN
+
IREF
–
2488 F10
SWITCHING FREQUENCY
fSW = 123kHz INTERNAL OSCILLATOR
fSW = 0.4 fEOSC EXTERNAL OSCILLATOR
REF–
10k
100Ω
INPUT
MULTIPLEXER
100Ω
IIN+
()
AVG
= IIN
–
()
AVG
=
VIN(CM) VREF(CM)
0.5REQ
IREF+
()
AVG
1.5VREF + VREF(CM) –VIN(CM)
()
0.5 REQ
–
VIN
2
VREF REQ
where:
VREF =REF
+
REF
VREF(CM) =
REF+ –REF
2
VIN =IN
+ IN ,WHERE IN+ ANDIN ARE THE SELECTEDINPUT CHANNELS
VIN(CM) =
IN+ –IN
2
REQ = 2.98M INTERNAL OSCILLATOR
REQ = 0.83310
12
()/fEOSC EXTERNALOSCILLATOR
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