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參數(shù)資料
| 型號(hào)： | DC979A |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2442 |
| 軟件下載： | QuikEval System |
| 設(shè)計(jì)資源： | DC979A Design File DC979A 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? |
| 工作溫度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2442 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LTC2442IG#TRPBF-ND - IC ADC 24BIT 250MSPS 36-SSOP LTC2442CG#TRPBF-ND - IC ADC 24BIT 250MSPS 36-SSOP LTC2442IG#PBF-ND - IC ADC 24BIT 4CH 36-SSOP LTC2442CG#PBF-ND - IC ADC 24BIT 4CH 36-SSOP |
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LTC2442
27
2442fa
For more information www.linear.com/LTC2442
Low Power Operation
The integrated buffers have a supply current of 1mA total,
greatly reducing the total power consumption when the
ADC is operated at a low duty cycle. The typical approach
to driving a
DSADC is to use a high bandwidth amplifier
that settles very quickly in response to the sampling pro-
cess at the ADC input. The LTC2442 approach is to use
an accurate, low bandwidth amplifier that requires a load
capacitor for compensation. This capacitor also serves as
a charge reservoir during the sampling process, so the
disturbance at the ADC input is minimal. The amplifier
only supplies the average sampling current that the ADC
draws, which is on the order of 50A.
Scaling for Higher Input Voltages
TheLTC2442isideallysuitedforapplicationswithlow-lev-
el, differential signal with a common mode approximately
equal to mid-supply, such as strain gages and silicon
micromachinedsensors.Otherapplicationsrequirescaling
a high voltage signal to the range of the ADC.
Figure20showshowtoproperlyscaleabipolar,ground-re-
ferred input voltage to drive the LTC2442. First, the input
must be level shifted so that it never exceeds the LTC2442
supply rails. This is commonly done with an instrumenta-
tion amplifier or simple op-amp level shift circuit. Rather
than shift the analog input, the LTC2442 can run on ±2.5V
supplies so that ground is centered in the input range.
This is equivalent to a perfect analog level shift with no
degradation in accuracy. The digital signals are shifted
from 0 to 5V logic to ±2.5V logic by a very inexpensive
74HC4053 analog switch and the data from the LTC2442
is shifted back to 0 to 5V logic by a MMBT3904 transistor.
On both inputs, precision resistor networks scale the
input signal from ±10V to ±2.5V. CH0-1 is driven truly
differentially for maximum linearity, typically better than
3ppm, however 3 resistors and an LTC2050HV autozero
amplifierarerequired.The8.88k
Woutputresistorbalances
the offset associated with the LTC2442’s bias current. The
resistance seen by CH0 is 4.44k and the offset at CH0 is
also inverted and appears at the output of the LTC2050HV.
CH2toCH3isdrivensingle-ended,withCH3tiedtoground.
Thisdegradeslinearityslightly,butitiseasiertoimplement
than a true differential drive. In this case the resistance at
CH3 should be equal to the resistance at CH2 or 7.5k. This
circuit is also suitable for signals that are always positive,
with the LTC2442 operating on a single 5V supply.
applications inForMation
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