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.
Type
Ordering Code
Package
s
TCA 965 B
Q67000-A8338
P-DIP-14-1
s
Not for new design
Window Discriminator
Preliminary
Bipolar IC
P-DIP-14-1
Features
q
Two window settings
direct setting of lower and upper edge
voltage (window edges)
indirect setting by window center
voltage and half window width
q
Adjustable hysteresis
q
Digital outputs with open collectors
for currents up to 50 mA
q
Adjustable reference voltage
V
Stab
Semiconductor Group
1
1998-02-10
TCA 965 B
TCA 965 B
Semiconductor Group
2
1998-02-10
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.
Block Diagram
Outputs A, B, C, D are open-collector
IEB00091
20 k
20 k
_
+
Amp 3
R
_
+
_
+
+
_
+
_
K1
K2
Amp 1
Amp 2
1
1
1
1
V = 1
V = 1
11
1
5
S
+
V
V
REF
2
10
4
13
3
12
14
V
Stab
A
Inhibit A
C
D
Inhibit B
B
7
8
9
6
V
7
V
8
V
9
V
6
_
<
TCA 965 B
Semiconductor Group
3
1998-02-10
Pin Configuration
(top view)
Pin Definitions and Functions
Pin
Symbol
Pin Function in
Direct Setting
Indirect Setting
of Window
1
2
3
4
5
GND
A
D
Inhibit A
V
REF
GND
Logic output A
Logic output D = A @ B (AND)
Connected to GND: logic output A = HIGH
Internal
V
REF
= 3 V
6
7
8
9
V
6
V
7
V
8
V
9
Upper edge voltage
Lower edge voltage
Input voltage
GND
Input voltage
V
6/7
Input voltage
V
6/7
Center voltage
Half window width
10
11
12
13
14
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
TCA 965 B
IEP00292
C
D
A
GND
7
8
6
9
5
10
4
11
3
12
2
13
1
14
B
7
V
Inhibit A
6
V
REF
V
Inhibit B
V
9
V
S
V
Stab
V
8
+
TCA 965 B
Semiconductor Group
4
1998-02-10
Absolute Maximum Ratings
Maximum ratings for ambient temperature
T
A
= 25 to 85
C
Parameter
Symbol
Limit Values
Unit
min.
max.
Supply voltage (pin 11)
Difference in input voltage between pins 6, 7, 8
Input voltage (pins 6, 7, 8, 9)
V
S
V
I
V
I
30
15
30
V
V
V
Output current (pins 2, 3, 13, 14)
I
Q
50
mA
Output voltage (pins 2, 3, 13, 14)
independent of
V
S
Voltage on
V
REF
(pin 5)
V
Q
V
R
30
8
V
V
Output current of stabilized voltage (pin 10)
I
10
10
mA
Inhibit input voltage (pins 4, 12)
V
IH
7
V
Junction temperature
Storage temperature
T
j
T
stg
55
150
125
C
C
Thermal resistance system - air
P-DIP-14-1
R
th SA
80
K/W
Operating Range
Supply voltage
V
S
4.5
30
V
Ambient temperature
T
A
25
85
C
TCA 965 B
Semiconductor Group
5
1998-02-10
Characteristics
V
S
= 10 V;
T
A
= 25
C
Parameter
Symbol
Limit Values
Unit
Test
Condition
Test
Circuit
min. typ. max.
Current consumption
Input current
(pins 6, 7, 8)
Input current, pin 9
I
S
I
I
I
I
5
20
400
7
50
3000
mA
nA
nA
V
2
,
V
13
=
V
QH
1
1
1
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
Reference voltage
Stabilized voltage on
pin 10
TC of reference voltage
Sensitivity of reference
voltage to supply-voltage
variation
V
IO
V
IO
V
I
V
I
V
6
(
V
8
V
9
)
(
V
8
+
V
9
)
V
7
V
5
V
10
V
5
V
5
/
V
S
20
50
1.5
50
2.8
5.5
3
6
0.4
2
20
50
V
S
1
V
S
/2
13
13
3.2
6.5
mV
mV
V
mV
V
V
V
V
mV/K
mV/V
V
I
< 13 V
I
REF
= 0
V
S
> 7.9 V
1
2
1
2
Output reverse current
I
QH
10
A
Output saturation voltage
Hysteresis of window
edges
Inhibit threshold
V
QL
V
U
V
L
V
4, 12
18
1
100
500
22
200
800
35
1.8
mV
mV
mV
V
I
Q
= 10 mA
I
Q
= 50 mA
1
Inhibit current
I
4, 12
100
A
Switching frequency
f
dir
f
ind
20
50
kHz
kHz
1
2
PDF 
ZIP