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L9700D013TRSTN/a2500avaiHEX PRECISION LIMITER


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L9700D013TR
HEX PRECISION LIMITER
L9700
September 2000
HEX PRECISION LIMITER. HIGH PERFORMANCE CLAMPING AT
GROUND AND POSITIVE REFERENCE
VOLTAGE. FAST ACTIVE CLAMPING . OPERATING RANGE 4.75 - 5.25 V. SINGLE VOLTAGE FOR SUPPLY AND POSITI-
VE REFERENCE. LOW QUIESCENT CURRENT. LOW INPUT LEAKAGE CURRENT
DESCRIPTION

The L9700 is a monolithic circuit which is suited for
input protection and voltage clamping purpose.
The limiting function is referred to ground and the
positive supply voltage.
One single element contains six independent chan-
nels.
Very fast speed is achieved by internal feedback
and the application of a new vertical PNP-transistor
with isolated collector.
BLOCK DIAGRAM

PIN CONNECTION
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
ELECTRICAL CHARACTERISTICS (VCC = 5V, TJ = –40 to 125°C unless otherwise specified)

(*) Design limits are guaranteed by statistical control on production samples over the indicated temperature and supply voltage
ranges. These limits are not used to calculate outgoing quality levels.
Note: The circuit is ESD protected according to MIL-STD-883C
L9700

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Figure 1 : DC INPUT CHARACTERISTIC Limit Points of the Characteristic Approximation.
Figure 2 : Dynamical Input Characteristics.
L9700

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Figure 2 : Dynamical Input Characteristics (continued) .
APPLICATION INFORMATION

Most integrated circuits, both HNMOS and bipolar,
are very sensitive to positive and negative overvol-
tages on the supply and at the inputs.
These transients occur in large numbers and with
different magnitudes in the automotive environment,
making adequate protection for devices ai-med at it
indispensible.
Overvoltages on the supply line are faced through
high voltage integration technologies or through ex-
ternal protection (transil, varistor).
Signal inputs are generally protected using clamp
diodes to the supply and ground, and a current limi-
ter resistor. However, such solutions do not always
completely satisfy the protection specifications in
terms of intervention speed, negative clamping and
current leakage high enough to change analog si-
gnals.
The L9700 device combines a high intervention
speed with a high precision positive and negative
clamp and a low current leakage providing the opti-
mal solution to the problems of the automotive en-
vironment.
The high intervention speed, due to the pre-bias of
the limiter stage and internal feedback, limits the
voltage overshoot and avoid the use of external ca-
pacitors for the limitation of the transient rise times.
Figure 3 illustrates a typical automotive application
scheme. The resistor RS limits the input current of
the device and is therefore dimensioned considering
the characteristics of the transients to be eliminated.
Consequently :
Vtransient PeakRS = IIN MAX
The CIN capacitors must be used only on analog in-
puts because they present a low impedance during
the sampling period.
L9700

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Figure 3 : Typical Application.
The minimum value for CIN is determined by the ac-
curacy required, the time taken to sample the input
and the input impedance during that time, while the
maximum value is determined by the required fre-
quency response and the value of RS.
Thus for a resistive input A/D connector where := Sample time (Seconds)= Device input resistance (Ohms)
VIN= Input voltage (Volts) = Required accuracy (%)= Charge on capacitor before sampling= Charge on capacitor after sampling= Device input current (Amps)
Thus :
k ⋅ Q1 Q1– Q2 = 100
but Q1 = CIN VIN
and Q1– Q2 = ID – TS
k ⋅ CIN – VIN so that ID TS = 100
ID ⋅ TS and CIN (min) = Farad VIN ⋅ k
100 ⋅ TS so CIN (min) = Farad k ⋅ RD
The calculation for a sample and hold type convertor
is even simpler : = Required accuracy (%)= Hold capacitor (Farad)
100 ⋅ CH CIN (min) = Farad k
L9700

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L9700
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