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UC3704J датащи(PDF) 3 Page - Texas Instruments

номер детали UC3704J
подробное описание детали  Bridge Transducer Switch
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC3704J датащи(HTML) 3 Page - Texas Instruments

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UC3704
ELECTRICAL CHARACTERISTICS:
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Comparator Two (QOUT and QOUT)
Threshold Voltage
2.2
3.0
3.8
V
Threshold Resistance
To Ground
14
20
24
k
Input Bias Current
VIN (Pin 12) = 5V
1
3
µA
Remote Activate Current
Pin 14 = 0V
0.2
0.5
mA
Reset Current
Pin 13 = 0V
0.2
0.5
mA
Remote Activate Threshold
TA = 25°C
0.8
1.2
V
Reset Threshold
TA = 25°C
0.8
1.2
V
Output Saturation
IOUT = 16mA
0.2
0.5
V
IOUT = 50mA
0.7
2.0
V
Output Leakage
VOUT = 40V
0.2
10
µA
Output Response
Comp. Overdrive = 1V
RL = 5k to VIN
Turn-on
0.4
µs
Turn-off
1.0
µs
Buffer
Set Voltage (VIN -VS)TJ = 25°C, IS = 100mA
1.9
2.1
2.3
V
Drive Current
TJ = 25°C, RS = 200
Ω, VD = 0V
90
100
120
mA
Note 1: Parameter guaranteed by design, not tested in production.
Note 2: Collector output current =
VIN
− VREF − VBE
RE
1.5
V
RE
APPLICATIONS INFORMATION
Sensor Section
The input portion of the UC3704 provides both excitation
and
sensing
for
a
low-level,
variable
impedance
transducer. This circuitry consists of a pair of highly
matched PNP transistors biased for operation as constant
current sources followed by a high gain precision compa-
rator.
The reference voltage at the bases of the PNP transistors
has a TC to offset the base-emitter voltage variation of
these transistors resulting in a constant voltage across
the external emitter resistors and correspondingly con-
stant collector currents for balancing, offsetting, or to pro-
vide unique temperature characteristic.
With the PNP transistor’s optimum current ranging from
10 to 200
µA, and the common-mode input voltage of the
comparator usable from ground to (VIN - 3V), a wide
range of transducer impedance levels is possible.
The sensor comparator has a current source pull-up at
the output so that an external capacitor from this point to
ground can be used to provide a programmable delay be-
fore reaching the second comparator’s threshold. The
low-impedance on-state of Comp 1’s output provides
quick reset of this capacitor. This programmable delay
function is useful for providing transient protection by re-
quiring that Comp 1 remain activated for a finite period of
time before Comp 2 triggers. Another application is in
counting repetitive pulses where a missing pulse will al-
low Comp 1’s output to rise to Comp 2’s threshold. This
time delay function is:
Delay
=
Comp2 Threshold
Delay Current
X CD
≈ 175ms
⁄ µF
If hysteresis is desired for Comparator 1, it may be ac-
commodated by applying positive feedback from the de-
lay terminal to the non-inverting input on Pin 7. This will
aid in providing oscillation-free transitions for very slowly
changing inputs.
Unless otherwise stated, these specifications apply for TA = 0°C to +70°C for the
UC3704: VIH = 15V, TA =TJ.
3


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