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參數(shù)資料
| 型號： | DC1011A-A |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 7/38頁 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2498 |
| 軟件下載： | QuikEval System |
| 設(shè)計(jì)資源： | DC1011A Schematic DC1011A Design Files |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 7.5 |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 已用 IC / 零件： | LTC2498 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LTC2498HUHF#TRPBF-ND - IC ADC 24BIT 16CH DELTA 38-QFN LTC2498HUHF#PBF-ND - IC ADC 24BIT 16CH DELTA 38-QFN LTC2498IUHF#TRPBF-ND - IC ADC 24BIT 16CH 38-QFN LTC2498CUHF#TRPBF-ND - IC ADC 24BIT 16CH 38-QFN LTC2498IUHF#PBF-ND - IC ADC 24BIT 16CH 38-QFN LTC2498CUHF#PBF-ND - IC ADC 24BIT 16CH 38-QFN |
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LTC2498
15
2498ff
applications inForMation
enables external RC networks and high impedance sen-
sors to directly interface to the LTC2498 without external
amplifiers. The remaining common mode input current
is eliminated by either balancing the differential input
impedances or setting the common mode input equal
to the common mode reference (see the Automatic Dif-
ferential Input Current Cancellation section). This unique
architecture does not require on-chip buffers thereby
enabling signals to swing beyond ground or up to VCC.
Moreover, the cancellation does not interfere with the
transparent offset and full-scale auto-calibration and the
absolute accuracy (full-scale + offset + linearity + drift) is
maintained even with external RC networks.
Power-Up Sequence
The LTC2498 automatically enters an internal reset state
when the power supply voltage VCC drops below ap-
proximately 2V. This feature guarantees the integrity of
the conversion result, input channel selection, and serial
clock mode.
WhenVCCrisesabovethisthreshold,theconvertercreates
an internal power-on reset (POR) signal with a duration
of approximately 4ms. The POR signal clears all internal
registers. The conversion immediately following a POR
cycle is performed on the input channel IN+ = CH0, IN– =
CH1, simultaneous 50Hz/60Hz rejection and 1x output
rate. The first conversion following a POR cycle is accurate
within the specification of the device if the power supply
voltage is restored to (2.7V to 5.5V) before the end of the
POR interval. A new input channel, rejection mode, speed
mode, or temperature selection can be programmed into
the device during this first data input/output cycle.
Reference Voltage Range
Thisconverteracceptsatrulydifferentialexternalreference
voltage. The absolute/common mode voltage range for
REF+ and REF– pins covers the entire operating range of
the device (GND to VCC). For correct converter operation,
VREF must be positive (REF+ > REF–)
The LTC2498 differential reference input range is 0.1V to
VCC. For the simplest operation, REF+ can be shorted to
VCC and REF– can be shorted to GND. The converter out-
put noise is determined by the thermal noise of the front
end circuits, and as such, its value in nanovolts is nearly
constant with reference voltage. A decrease in reference
voltagewillnotsignificantlyimprovetheconverter’seffec-
tive resolution. On the other hand, a decreased reference
will improve the converter’s overall INL performance.
Input Voltage Range
The analog input is truly differential with an absolute, com-
mon mode range for CH0 to CH15 and COM input pins
extending from GND – 0.3V to VCC + 0.3V. Outside these
limits, the ESD projection devices begin to turn on and the
errorsduetoinputleakagecurrentincreaserapidly.Within
these limits, the LTC2498 converts the bipolar differential
input signal VIN = IN+ + IN– (where IN+ and IN– are the
selected input channels), from –FS = –0.5 VREF to +FS =
0.5 VREF where VREF = REF+ – REF–. Outside this range,
the converter indicates the overrange or the underrange
condition using distinct output codes.
Signals applied to the input (CH0 to CH15, COM) may
extend 300mV below ground and above VCC. In order to
limit any fault current, resistors of up to 5k may be added
in series with the input. The effect of series resistance on
the converter accuracy can be evaluated from the curves
presentedintheInputCurrent/ReferenceCurrentsections.
In addition, series resistors will introduce a temperature
dependent error due to input leakage current. A 1nA input
leakage current will develop a 1ppm offset error on a 5k
resistor if VREF = 5V. This error has a very strong tem-
perature dependency.
MUXOUT/ADCIN
The output of the multiplexer (MUXOUT) and the input
to the ADC (ADCIN) can be used to perform input signal
conditioningonanyoftheselectedinputchannelsorsimply
shortedtogetherfordirectdigitization.Ifanexternalampli-
fier is used, the LTC2498 automatically calibrates both the
offset and drift of this circuit and the Easy Drive sampling
scheme enables a wide variety of amplifiers to be used.
In order to achieve optimum performance, if an external
amplifier is not used, short these pins directly together
(ADCINP to MUXOUTP and ADCINN to MUXOUTN) and
minimize their capacitance to ground.
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