參數(shù)資料
型號(hào)： LTC2497CUHF#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT W/PGA 38-QFN
標(biāo)準(zhǔn)包裝： 52
位數(shù)： 16
采樣率（每秒）： 7.5
數(shù)據(jù)接口： I²C，串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 480µW
電壓電源： 單電源
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 38-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 38-QFN（5x7）
包裝： 管件
輸入數(shù)目和類型： 16 個(gè)單端，雙極；8 個(gè)差分，雙極
產(chǎn)品目錄頁(yè)面： 1348 (CN2011-ZH PDF)
配用： DC1012A-B-ND - BOARD DELTA SIGMA ADC LTC2497
LTC2497
2497fa
source impedances are not possible. One pair of external
buffers/amplifiers can be shared between all 17 analog
inputs.TheLTC2497performsaninternaloffsetcalibration
every conversion cycle in order to remove the offset and
drift of the ADC. This calibration is performed through a
combination of front end switching and digital process-
ing. Since the external amplifier is placed between the
multiplexer and the ADC, it is inside this correction loop.
This results in automatic offset correction and offset drift
removal of the external amplifier.
The LTC6078 is an excellent amplifier for this function.
It operates with supply voltages as low as 2.7V and its
noise level is 18nV/√Hz. The Easy Drive input technology
of the LTC2497 enables an RC network to be added directly
to the output of the LTC6078. The capacitor reduces the
magnitude of the current spikes seen at the input to the
ADC and the resistor isolates the capacitor load from the
op-amp output enabling stable operation. The LTC6078
can also be biased at supply rails beyond those used by
the LTC2497. This allows the external sensor to swing rail-
to-rail (–0.3V to VCC + 0.3V) without the need of external
level shift circuitry.
Reference Current
Similar to the analog inputs, the LTC2497 samples the
differential reference pins (REF+ and REF–) transferring
small amounts of charge to and from these pins, thus
producing a dynamic reference current. If incomplete set-
tling occurs (as a function the reference source resistance
andreferencebypasscapacitance)linearityandgainerrors
are introduced.
Forrelativelysmallvaluesofexternalreferencecapacitance
(CREF< 1nF), the voltage on the sampling capacitor settles
for reference impedances of many k
W (if CREF = 100pF up
to 10k
W will not degrade the performance) (see Figures
11 and 12).
Figure 11. +FS Error vs RSOURCE at VREF (Small CREF)
Figure 12. –FS Error vs RSOURCE at VREF (Small CREF)
applicaTions inForMaTion
RSOURCE ( )
0
+FS
ERROR
(ppm)
50
70
90
10k
2497 F11
30
10
40
60
80
20
0
–10
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN+ = 3.75V
VIN– = 1.25V
fO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
RSOURCE ( )
0
–FS
ERROR
(ppm) –30
–10
10
10k
2497 F12
–50
–70
–40
–20
0
–60
–80
–90
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN+ = 1.25V
VIN– = 3.75V
fO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
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