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ZN409CE
PRECISION SERVO INTEGRATED CIRCUIT
The ZN409CE is a precision monolithic integrated circuit
designed particularly for pulse-width position servo mecha-
nisms used in all types of control applications. The low
number of components required with the ZN409CE, together
with its low power consumption, make this integrated circuit
ideal for use in model aircraft, boats and cars where space,
weight and battery life are at a premium. The amplifier will
operate over a wide range of repitition rates and pulse widths
and is therefore suitable for the majority of systems. The
ZN409CE can also be used in motor speed control circuits.
DS3894 - 2.0
FEATURES
s
Low External Component Count
s
Low Quiescent Current (7mA Typical at 4.8V)
s
Excellent Voltage and Temperature Stability
s
High Output Drive Capability
s
Consistent and Repeatable Performance
s
PrecisionInternal Voltage Stabilisation
s
Time Shared Error Pulse Expansion
s
Balanced Deadband Control
s
Schmitt Trigger Input Shaping
s
Reversing Relay Output (DC Motor Speed Control)
Fig.1 Pin connections - top view
ABSOLUTE MAXIMUM RATINGS
Supply voltage
6.5V
Package dissipation
300mW
Operating Temperature range
-20
C to +65
C
Storage temperature range
-65
C to +150
C
Fig.2 Block diagram for ZN409CE
ZN409CE
2
Pin 14
Pin 14
-10
C to +65
C
-10
C to +65
C, 1.3mA load current
V
S
= 3.5V to 6.5V
dV
IN
RSRR = dV
OUT
45
, R
p
= 1.5k
, R
1
= 12k
Excluding R
T
, C
T
. R
p
= 1.5k
,
R
1
= 12k
(potentiometer slider set
mid-way)
C
E
= 0.47
F
C
E
= 0.47
F, R
E
= 180k
15ms repetition rate
C
E
= 0.47
F, R
E
= 180k
C
D
= 1000pF
T = 25
C
T = 10
C
I
L
= 400mA
Quiescent
V
S
= 3.5V
T = 25
C
T = -10
C
Input threshold (lower)
Input threshold (upper)
Ratio upper/lower threshold
Input resistance
Input current
Regulator voltage
Regulator supply rejection ratio
Monostable Linearity
Monostable period temperature
coefficient
Output Schmitt deadband
Minimum output pulse
Error pulse for full drive
Total deadband
PNP drive
Output saturation voltage
Direction bistable output
Supply voltage range
Supply current
Total external current from regulator
Peak voltage V
C EXT
(with respect to 2V
regulated voltage)
1.35
1.6
1.3
35
650
2.3
-
4.0
-
3
4.5
130
6.5
70
65
400
3.6
6.5
10
-
-
-
1.25
1.5
1.2
27
500
2.2
300
3.5
+0.01
1.5
3.5
100
5
55
50
300
2.8
5
6.7
-
0.7
0.5
1.15
1.4
1.1
20
350
2.1
200
-
-
1
2.5
70
3.5
40
35
-
2
3.5
4.6
1.3
-
-
V
V
k
A
V
%
%/
C
s
ms
s
s
mA
mA
mV
mA
V
mA
mA
V
V
Value
Min.
Typ.
Max.
Units
Characteristics
Test conditions
ELECTRICAL CHARACTERISTICS
Test conditions (unless otherwise stated):
T
amb
= 25
C, V
S
= 5V
CIRCUIT DESCRIPTION
The ZN409CE incorporates a precision dual voltage
source providing 1.5V for internal use and 2.2V for external
circuit requirements.
The input circuit is a Schmitt trigger allowing servo opera-
tion independent of edge speed, as obtained from the re-
ceiver-decoder.
Output from the Schmitt trigger is fed to the deadband and
monostable circuits. The deadband circuit prvides a
prgrammable area of insensitivity to input pulse in order to
eliminate hunting and overshoot. Dynamic feedback can be
used to reduce the width of the deadband to acceptable levels,
and to maintain correct servo operation.
The monostable circuits provide the inputs to the pulse
comparison circuit which determines direction and amount of
drive required to reach the new position. The output drive is
also controlled by the pulse expansion circuit. This circuit
ensures that a stationary motor will start rotating without
drawing full stall current. This gives much improved battery
life.
ZN409CE
3
ZN409CE
4
HEADQUARTERS OPERATIONS
GEC PLESSEY SEMICONDUCTORS
Cheney Manor, Swindon,
Wiltshire SN2 2QW, United Kingdom.
Tel: (0793) 518000
Fax: (0793) 518411
GEC PLESSEY SEMICONDUCTORS
P.O. Box 660017
1500 Green Hills Road,
Scotts Valley, California 95067-0017,
United States of America.
Tel: (408) 438 2900
Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES
FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Fax : (1) 64 46 06 07
GERMANY Munich Tel: (089) 3609 06-0 Fax : (089) 3609 06-55
ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993
JAPAN Tokyo Tel: (03) 5276-5501 Fax: (03) 5276-5510
NORTH AMERICA Integrated Circuits and Microwave Products Scotts Valley, USA
Tel (408) 438 2900 Fax: (408) 438 7023.
Hybrid Products, Farmingdale, USA Tel (516) 293 8686 Fax: (516) 293 0061.
SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872
SWEDEN Stockholm, Tel: 46 8 702 97 70 Fax: 46 8 640 47 36
UK, EIRE, DENMARK, FINLAND & NORWAY
Swindon Tel: (0793) 518510 Fax : (0793) 518582
These are supported by Agents and Distributors in major countries world-wide.
GEC Plessey Semiconductors 1993 Publication No. DS3894 Issue No. 2.0 Octobner 1993
This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded
as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The Company
reserves the right to alter without prior knowledge the specification, design or price of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute
any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and suitability of any equipment using such information
and to ensure that any publication or data used is up to date and has not been superseded. These products are not suitable for use in any medical products whose failure to perform may result in significant injury
or death to the user. All products and materials are sold and services provided subject to the Company's conditions of sale, which are available on request.
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