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VFC320 Datasheet(PDF) 5 Page - Texas Instruments

Part # VFC320
Description  Voltage-to-Frequency and Frequency-to-Voltage CONVERTER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

VFC320 Datasheet(HTML) 5 Page - Texas Instruments

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VFC320
5
SBVS017A
(8)
In the time t1 + t2 the integrator capacitor C2 charges and
discharges but the net voltage change is zero.
Thus
∆Q = 0 = I
IN t1 + (IIN – IA) t2
So that IIN (t1 + t2) = IA t2
But since t1 + t2 =
and IIN =
fOUT =
In the time t1, IB charges the one-shot capacitor C1 until its
voltage reaches –7.5V and trips comparator B.
Thus t2 =
Using
in
yield f
V
RC
I
I
OUT
IN
B
A
()
()
.
76
75
11
=•
Since IA = IB the result is
fOUT =
Since the integrating capacitor, C2, affects both the rising
and falling segments of the ramp voltage, its tolerance and
temperature coefficient do not affect the output frequency. It
should, however, have a leakage current that is small com-
pared to IIN, since this parameter will add directly to the gain
error of the VFC. C1, which controls the one-shot period,
should be very precise since its tolerance and temperature
coefficient add directly to the errors in the transfer function.
begins to ramp down again before the input amplifier has a
chance to saturate. In effect the comparators and flip-flop
form a one-shot whose period is determined by the internal
reference and a 1mA current sink plus the external capacitor,
C1. After the one-shot resets, fOUT changes back to logic 0
and the cycle begins again.
The transfer function for the VFC320 is derived for the
circuit shown in Figure 4. Detailed waveforms are shown in
Figure 5.
fOUT =
1
t
1 + t2
0V
–7.5V
∆V
OUT
t
1
t
2
FIGURE 5. Integrator and VFC Output Timing.
(1)
FIGURE 4. Functional Block Diagram of the VFC320.
f
OUT
V
IN
1
R
1
I
A R2 R2
V
IN
C
IN 7.5
I
B
7.5 R
1 C1
V
IN
(3)
(2)
(4), (5)
(6)
(7)
(9)
Comparators
Flip-
flop
Common
f
OUT
f
IN
One-shot
V
OUT
1
5
411
I
A
I
IN
e
1
e
2
Switch
C
1
One-shot
Capacitor
–V
CC
12
+V
CC
7
Pull-up
Resitor
R
2
10
13
Input
Amp
Constant
Current Sinks
(1mA)
–7.5V
Ref
B
Integrating
Capacitor
R
1
Input Resistor
Q
1
C
2
I
B
A
For Postive Input Voltages use e
1, short e2.
For Negative Input Voltages use e
2, short e1.
For Differental Input Voltages use e
1 and e2.
V
IN:
f
OUT =
V
IN
7.5 R
1 C1
+V
PULL-UP (VPU)
(5V to 15V Typically)
14


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