參數(shù)資料
型號(hào)： 2486
廠商： Linear Technology Corporation
英文描述： 16-Bit 2-/4-Channel ツヒ ADC with PGA and Easy Drive Input Current Cancellation
中文描述： 16位2-/4-ChannelツヒADC，帶PGA和簡(jiǎn)易輸入電流驅(qū)動(dòng)取消
文件頁(yè)數(shù)： 15/36頁(yè)
文件大?。?/td> 596K
代理商： 2486
LTC2486
15
2486f
APPLICATIONS INFORMATION
Easy Drive Input Current Cancellation
The LTC2486 combines a high precision, delta-sigma ADC
with an automatic, differential, input current cancellation
front end. A proprietary front end passive sampling network
transparently removes the differential input current. This
enables external RC networks and high impedance sen-
sors to directly interface to the LTC2486 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 architec-
ture does not require on-chip buffers, thereby enabling
signals to swing beyond ground and V
CC
. 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 LTC2486 automatically enters an internal reset state
when the power supply voltage, V
CC
, drops below ap-
proximately 2V. This feature guarantees the integrity of
the conversion result, input channel selection, and serial
clock mode.
When V
CC
rises above this threshold, the converter creates
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 and
IN
–
= CH1 with simultaneous 50Hz/60Hz rejection, 1x
output rate, and gain = 1. 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, temperature selection or
gain can be programmed into the device during this first
data input/output cycle.
Reference Voltage Range
This converter accepts a truly differential external reference
voltage. The absolute/common mode voltage range for the
REF
+
and REF
–
pins covers the entire operating range of
the device (GND to V
CC
). For correct converter operation,
V
REF
must be positive (REF
+
> REF
–
).
The LTC2486 differential reference input range is 0.1V to
V
CC
. For the simplest operation, REF
+
can be shorted to
V
CC
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
voltage will not significantly improve the converter’s effec-
tive resolution. On the other hand, a decreased reference
will improve the converter’s overall INL performance.
Input Voltage Range
The analog inputs are truly differential with an absolute,
common mode range for the CH0 to CH3 and COM input
pins extending from GND – 0.3V to V
CC
+ 0.3V. Outside
these limits, the ESD protection devices begin to turn
on and the errors due to input leakage current increase
rapidly. Within these limits, the LTC2486 converts the
bipolar differential input signal V
IN
= IN
+
– IN
–
(where
IN
+
and IN
–
are the selected input channels), from –FS =
–0.5 V
REF
/Gain to +FS = 0.5 V
REF
/Gain where V
REF
=
REF
+
– REF
–
. Outside this range, the converter indicates
the overrange or the underrange condition using distinct
output codes (see Table 1).
Signals applied to the input (CH0 to CH3, COM) may
extend 300mV below ground and above V
CC
. 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
presented in the Input Current/Reference Current sections.
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 V
REF
= 5V. This error has a very strong tem-
perature dependency.
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