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參數(shù)資料
| 型號： | LTC2496IUHF#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT DELTA SIG 38-QFN |
| 標準包裝： | 2,500 |
| 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： | 38-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 38-QFN（5x7） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 16 個單端，雙極；8 個差分，雙極 |
| 配用： | DC1011A-B-ND - BOARD DELTA SIGMA ADC LTC2496 |
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LTC2496
2496fb
applicaTions inForMaTion
frontend.Aproprietaryfrontendpassivesamplingnetwork
transparently removes the differential input current. This
enables external RC networks and high impedance sen-
sors to directly interface to the LTC2496 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 Automatic Differential
Input Current Cancellation Section). This unique archi-
tecture does not require on-chip buffers thereby enabling
signalstoswingbeyondgroundoruptoVCC.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 LTC2496 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.ThefirstconversionfollowingaPORcycleisaccurate
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, 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 LTC2496 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
output noise is determined by the thermal noise of the
front end circuits. Since the transition noise is well below
1LSB (0.02LSB), a decrease in reference voltage will
proportionally improve the converter’s effective resolution
and improve the INL.
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 LTC2496 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 over range or the under range
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
temperature dependency.
MUXOUT/ADCIN
The output of the multiplexer (MUXOUT) and the input
to the ADC (ADCIN) can be used to perform input signal
conditioning on any of the selected input channels or sim-
ply shorted together for direct digitization. If an external
amplifier is used, the LTC2496 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.
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