Window Discriminator
TCA 965 B
Preliminary
Features
q
Bipolar IC
q
q
q
Two window settings
– direct setting of lower and upper edge
voltage (window edges)
– indirect setting by window center
voltage and half window width
Adjustable hysteresis
Digital outputs with open collectors
for currents up to 50 mA
Adjustable reference voltage
V
Stab
P-DIP-14-1
Type
s
TCA 965 B
s
Not for new design
Ordering Code
Q67000-A8338
Package
P-DIP-14-1
The window discriminator compares an input voltage to a defined voltage window. The
digital outputs show whether the input voltage is below, within or above this window.
The TCA 965 B window discriminator is especially suitable as a tracking or
compensating controller with a dead band in control engineering and for the selection of
DC voltages within a certain tolerance of the required setpoint value in measurement
engineering. When it is used as a Schmitt trigger, switching frequencies up to a typical
value of 50 kHz are possible.
Semiconductor Group
1
1998-02-10
TCA 965 B
Functional Description
Amplifier Amp 3 increases the voltage of the reference source
R
to
V
Stab
= 2 x
V
REF
. The
amplification factor can be altered by external wiring. With direct setting of the window,
the input voltage appears on amplifier Amp 1 (
V
8
), the upper edge voltage on
comparator K2 (
V
6
) and the lower edge voltage on comparator K1 (
V
7
).
With indirect setting of the window, the input voltage appears on inputs
V
6
and
V
7
, while
the center voltage is connected to amplifier A1 (
V
8
).
The voltage applied to the input (
V
9
) of amplifier Amp 2 is subtracted symmetrically from
the output voltage of amplifier Amp 1 and added. The comparators switch with
hysteresis. The logic gates have open-collector outputs.
If the inhibit input A or B is connected to ground, output A or B will always be high.
+
V
S
11
1
V
REF
5
20 k
Ω
20 k
Ω
R
Amp 3
10
V
7
7
_
+
+
_
K1
Amp 1
V
8
8
1
V=1
12
Amp 2
_
V
9
V
6
9
6
V=1
+
_
K2
Outputs A, B, C, D are open-collector
Block Diagram
Semiconductor Group
2
1998-02-10
+
_
V
Stab
1
2
A
4
_
<
1
Inhibit A
13
C
3
D
Inhibit B
+
1
14
B
IEB00091
TCA 965 B
Pin Configuration
(top view)
TCA 965 B
GND
A
D
Inhibit A
1
2
3
4
5
6
7
14
13
12
11
10
9
8
IEP00292
B
C
Inhibit B
+
V
S
V
REF
V
6
V
7
V
Stab
V
9
V
8
Pin Definitions and Functions
Pin
Symbol
Direct Setting
of Window
1
2
3
4
5
6
7
8
9
10
11
12
13
14
GND
A
D
Inhibit A
GND
Logic output A
Logic output D = A @ B (AND)
Connected to GND: logic output A = HIGH
Internal
V
REF
= 3 V
Upper edge voltage
Lower edge voltage
Input voltage
GND
Input voltage
V
6/7
Input voltage
V
6/7
Center voltage
Half window width
Pin Function in
Indirect Setting
V
REF
V
6
V
7
V
8
V
9
V
Stab
+
V
S
Inhibit B
C
B
Internal
V
Stab
= 6 V
Supply voltage
Connected to GND: logic output B = HIGH
Logic output C = A @ B (NAND)
Logic output B
3
1998-02-10
Semiconductor Group
TCA 965 B
Absolute Maximum Ratings
Maximum ratings for ambient temperature
T
A
= – 25 to 85
°C
Parameter
Symbol
Limit Values
min.
Supply voltage (pin 11)
Difference in input voltage between pins 6, 7, 8
Input voltage (pins 6, 7, 8, 9)
Output current (pins 2, 3, 13, 14)
Output voltage (pins 2, 3, 13, 14)
independent of
V
S
Voltage on
V
REF
(pin 5)
Output current of stabilized voltage (pin 10)
Inhibit input voltage (pins 4, 12)
Junction temperature
Storage temperature
Thermal resistance system - air
Operating Range
Supply voltage
Ambient temperature
P-DIP-14-1
max.
30
15
30
50
30
8
10
7
150
125
80
V
V
V
mA
V
V
mA
V
°C
°C
K/W
Unit
V
S
V
I
V
I
I
Q
V
Q
V
R
I
10
V
IH
T
j
T
stg
R
th SA
–
–
–
–
–
–
–
–
–
– 55
–
V
S
T
A
4.5
– 25
30
85
V
°C
Semiconductor Group
4
1998-02-10
TCA 965 B
Characteristics
V
S
= 10 V;
T
A
= 25
°C
Parameter
Symbol
Limit Values
min. typ. max.
Current consumption
Input current
(pins 6, 7, 8)
Input current, pin 9
Input offset voltage in
direct setting of window
Input offset voltage in
indirect setting of window
Input-voltage range on
pins 6, 7, 8
Input-voltage range on
pin 9
Differential input voltage
Unit
Test
Condition
Test
Circuit
1
1
1
1
2
∆
V
I
< 13 V
1
2
I
S
I
I
–
I
I
–
–
–
– 20
– 50
1.5
50
5
7
mA
V
2
,
V
13
=
V
QH
nA
50
20
400 3000 nA
20
50
mV
mV
V
IO
V
IO
V
I
V
I
V
6
– (
V
8
–
V
9
)
(
V
8
+
V
9
) –
V
7
V
S
– 1 V
V
S
/2
13
13
mV
V
V
V
Reference voltage
Stabilized voltage on
pin 10
TC of reference voltage
Sensitivity of reference
voltage to supply-voltage
variation
Output reverse current
V
5
V
10
α
V
5
∆
V
5
/∆
V
S
2.8
5.5
3
6
0.4
3.2
6.5
I
REF
= 0
V
V
S
> 7.9 V
mV/K
2
–
–
10
mV/V
µA
mV
mV
mV
V
µA
kHz
kHz
–
–
–
–
1
2
–
–
I
QH
Output saturation voltage
V
QL
Hysteresis of window
edges
Inhibit threshold
Inhibit current
Switching frequency
100 200
500 800
18
1
–
–
–
22
35
1.8
I
Q
= 10 mA 1
I
Q
= 50 mA
V
U
–
V
L
V
4, 12
I
4, 12
f
dir
f
ind
– 100 –
20
50
–
–
Semiconductor Group
5
1998-02-10
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