DS3894 Zarlink Semiconductor Inc, DS3894 Datasheet - Page 3

• Manufacturer Part Number: DS3894
• Description: PRECISION SERVO INTEGRATED CIRCUIT
• Manufacturer: Zarlink Semiconductor Inc

ZN409CE
2
CIRCUIT DESCRIPTION
source providing 1.5V for internal use and 2.2V for external
circuit requirements.
tion independent of edge speed, as obtained from the re-
ceiver-decoder.
monostable circuits.
prgrammable area of insensitivity to input pulse in order to
eliminate hunting and overshoot. Dynamic feedback can be
ELECTRICAL CHARACTERISTICS
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
regulated voltage)
Test conditions (unless otherwise stated):
The ZN409CE incorporates a precision dual voltage
The input circuit is a Schmitt trigger allowing servo opera-
Output from the Schmitt trigger is fed to the deadband and
T
amb
= 25 C, V
Characteristics
C EXT
S
= 5V
(with respect to 2V
The deadband circuit prvides a
Min.
1.15
350
200
1.4
1.1
2.1
2.5
3.5
4.6
1.3
20
70
40
35
3.5
2
-
-
-
-
-
1
+0.01
Value
1.25
500
300
100
300
Typ.
1.5
1.2
2.2
3.5
3.5
2.8
6.7
0.7
0.5
27
55
50
1.5
5
-
5
used to reduce the width of the deadband to acceptable levels,
and to maintain correct servo operation.
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.
1.35
650
130
400
Max.
1.6
1.3
2.3
4.0
4.5
3.6
6.5
35
70
65
10
6.5
-
-
-
-
-
3
The monostable circuits provide the inputs to the pulse
%/ C
Units
mA
mA
mV
mA
mA
mA
ms
k
%
V
V
V
V
V
V
A
s
s
s
Pin 14
Pin 14
-10 C to +65 C
-10 C to +65 C, 1.3mA load current
V
RSRR =
Excluding R
R
mid-way)
C
C
15ms repetition rate
C
C
T = 25 C
T = 10 C
I
Quiescent
V
T = 25 C
T = -10 C
L
S
S
1
E
E
E
D
45 , R
= 400mA
= 3.5V to 6.5V
= 12k (potentiometer slider set
= 0.47 F, R
= 3.5V
= 0.47 F
= 0.47 F, R
= 1000pF
p
Test conditions
= 1.5k , R
dV
dV
T
, C
IN
OUT
E
E
T
= 180k
. R
= 180k
p
1
= 1.5k ,
= 12k