參數(shù)資料
型號(hào)： DC846A
廠商： Linear Technology
文件頁(yè)數(shù)： 18/28頁(yè)
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2447
軟件下載： QuikEval System
設(shè)計(jì)資源： DC846A Design File
DC846A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 8k
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
已用 IC / 零件： LTC2447
已供物品： 板
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LTC2446/LTC2447
25
24467fa
Automatic Offset Calibration of External
Buffers/Amplifiers
The LTC2447 enables an external amplifier to be inserted
between the multiplexer output and the ADC input. This
enables one external buffer/amplifier circuit to be shared
between all nine analog inputs (eight single-ended or four
differential). The LTC2447 performs an internal offset
calibration 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
processing. Since the external amplifier is placed between
the multiplexer and the ADC, it is inside the correction
loop. This results in automatic offset correction and offset
drift removal of the external amplifier.
The LT1368 is an excellent amplifier for this function.
It has rail-to-rail inputs and outputs, and it operates on a
single 5V supply. Its open-loop gain is 1M and its input
bias current is 10nA. It also requires at least a 0.1
F load
capacitor for compensation. It is this feature that sets
it apart from other amplifiers—the load capacitor
APPLICATIO S I FOR ATIO
WU
U
–
+
–
+
5V
0V
1/2 LT1368
1
2
3
4
5
6
7
8
*LT1368 REQUIRES 0.1
F
OUTPUT COMPENSATION
CAPACITOR
MUX
MUXOUTN
MUXOUTP
ADCINP
ADCINN
9
24467 F17
(EXTERNAL AMPLIFIERS)
LTC2447
CH0-CH6/
COM
MUX
10
FIVE
DIFFERENTIAL
REFERENCE
INPUTS
SDI
SCK
SDO
CS
0.1
F*
OFFSETS AND 1/f NOISE
OF EXTERNAL SIGNAL
CONDITIONING CIRCUITS
ARE AUTOMATICALLY
CANCELLED
0.1
F*
HIGH
SPEED
Σ ADC
REF+
REF–
Figure 17. External Buffers Provide High Impedance Inputs and Amplifier Offsets are Cancelled
attenuates sampling glitches from the LTC2447 ADCIN
terminal, allowing it to achieve full performance of the
ADC with high impedance at the multiplexer inputs.
Another benefit of the LT1368 is that it can be powered
from supplies equal to or greater than that of the ADC.
This can allow the inputs to span the entire absolute
maximum of GND – 0.3V to VCC + 0.3V. Using a positive
supply of 7.5V to 10V and a negative supply of –2.5 to
–5V gives the amplifier plenty of headroom over the
LTC2447 input range.
Interfacing Sensors to the LTC2447
Figure 18 shows a few of the ways that the multiple
reference inputs of the LTC2447 greatly simplify sensor
interfacing. Each of the four references is fully differential
and has a differential range of 100mV to 5V. This opens up
many possibilities for sensing voltages and currents,
eliminating much of the analog signal conditioning cir-
cuitry required for interfacing to conventional ADCs.
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