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UC1635
UC2635
UC3635
Phase Locked Frequency Controller
Precision Phase Locked Frequency
Control System
Crystal Oscillator
Programmable Reference Frequency
Dividers
Phase Detector with Absolute Frequency
Steering
Separate Divider Outputs and Phase
Detector Input Pins
Double Edge Option on the Frequency
Feedback Sensing Amplifier
Two High Current Op Amps
5V Reference Output
The UC1635 family of integrated circuits was designed for use in preci-
sion speed control of DC motors. An extension to the UC1633 line of
phase locked controllers, these devices provide access to both of the
digital phase detector's inputs, and include a reference frequency di-
vider output pin. With this added flexibility, this family of controllers can
be used to obtain phase synchronization of multiple motors.
A reference frequency can be generated using the device's crystal oscil-
lator and programmable dividers. The oscillator operates using a broad
range of crystals, or, can function as a buffer stage to an external fre-
quency source.
The phase detector responds proportionally to the phase error between
the detector's minus input pin and the sense amplifier output. This
phase detector includes absolute frequency steering to provide maxi-
mum drive signals when any frequency error exists. This feature allows
optimum start-up and lock times to be realized.
Two op-amps are included that can be configured to provide necessary
loop filtering. The outputs of these op-amps will source or sink in excess
of 16mA, so they can provide a low impedance control signal to driving
circuits.
Additional features include a double edge option on the sense amplifier
that can be used to double the loop reference frequency for increased
loop bandwidths. A 5V reference output can be used to accurately set
DC operating levels.
FEATURES
DESCRIPTION
BLOCK DIAGRAM
UDG-92019
ABSOLUTE MAXIMUM RATINGS
UC1635
UC2635
UC3635
Input Supply Voltage (+V
IN
) . . . . . . . . . . . . . . . . . . . . +20V
Reference Output Current . . . . . . . . . . . . . . . . . . . . . -30mA
Op-Amp Output Currents . . . . . . . . . . . . . . . . . . . .
30mA
Op-Amp Input Voltages . . . . . . . . . . . . . . . . . . -0.3 to +20V
Phase Detector Input Voltage . . . . . . . . . . . . . -0.3V to +5V
Phase Detector Output Current . . . . . . . . . . . . . . . .
10mA
Lock Indicator Output Current . . . . . . . . . . . . . . . . . +15mA
Lock Indicator Output Voltage . . . . . . . . . . . . . . . . . . . +20V
Divide Select Input Voltages . . . . . . . . . . . . -0.3V to +10V
Double Edge Disable Input Voltage . . . . . . . -0.3V to +10V
Oscillator Input Voltage . . . . . . . . . . . . . . . . . . -0.3V to +5V
Sense Amplifier Input Voltage . . . . . . . . . . . . -0.3V to +20V
Power Dissipation at T
A
= 25
C, (Note 2) . . . . . . . 1000mW
Power Dissipation at T
C
= 25
C, (Note 2) . . . . . . . 2000mW
Operating Junction Temperature . . . . . . . . . -55
to 150
C
Storage Temperature . . . . . . . . . . . . . . . . . -65
to +150
C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . 300
C
Note 1: Voltages are referenced to ground, (Pin 16). Currents
are positive into, negative out of, the specified terminals.
Note 2: Consult Unitrode Integrated Circuits databook for in-
formation regarding thermal specifications and limitations of
packages.
CONNECTION DIAGRAMS
ELECTRICAL
CHARACTERISTICS:
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current
+V
IN
= 15V
20
28
mA
Reference
Output Voltage (V
REF
)
4.75
5.0
5.25
V
Load Regulation
I
OUT
= 0 to 7mA
5.0
20
mV
Line Regulation
+V
IN
= 8 to 15V
2.0
20
mV
Short Circuit Current
V
OUT
= 0V
15
35
mA
Unless otherwise stated, specifications hold for T
A
= 0
C to +70
C for the UC3635, -25
C to +85
C for
the UC2635 and -55
C to +125
C for the UC1635, +V
IN
= 12V. T
A
= T
J.
PACKAGE PIN FUNCTION
FUNCTION
PIN
N/C
1
Div 2/4
2
Phase Detector Input
3
Divider Output
4
Phase Detector Output
5
N/C
6
Dbl Edge Disable Input
7
Sense Amp Input
8
5V Ref Output
9
Loop Amp Inv Input
10
N/C
11
Loop Amp Output
12
Aux Amp Non-Inv Input
13
Aux Amp Inv Input
14
Aux Amp Output
15
N/C
16
+V
IN
17
OSC Output
18
OSC Input
19
Ground
20
PLCC-20 & LCC-20
(Top View)
Q & L Packages
DIL16 (Top View)
J & N Packages
SOIC16 (Top View)
DW Package
2
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator
DC Voltage Gain
Oscillator Input to Oscillator Output
12
16
20
dB
Input DC Level
(VIB)
Oscillator Input Pin Open, T
J
= 25
C
1.15
1.3
1.45 V
Input Impedance (Note 2)
V
IN
= V
IB
0.5V, T
J
= 25
C
1.3
1.6
1.9
k
Output DC Level
Oscillator Input Pin Open, T
J
= 25
C
1.2
1.4
1.6
V
Maximum Operating Frequency
10
MHz
Dividers
Maximum Input Frequency
Input = 1Vpp at Oscillator Input
10
MHz
Div 2/4 Input Current
Input = 5V (Div. by 2)
150
500
A
Input = 0V (Div. by 4)
-5.0
0.0
5.0
A
Div 2/4 Threshold
0.5
1.6
2.2
V
Divider Output
High Level (w/6.8k Load to GND)
4.0
4.5
V
Low Level (Open Collector Leakage)
10
A
Sense Amplifier
Threshold Voltage
Percent of V
REF
27
30
33
%
Threshold Hysteresis
10
mV
Input Bias Current
Input = 1.5V
-1.0
-0.2
A
Double Edge Disable Input
Input Current
Input = 5V (Disabled)
150
500
A
Input = 0V (Enabled)
-5.0
0.0
5.0
A
Threshold Voltage
0.5
1.6
2.2
V
Phase Detector
-Input Threshold
Detector Responds to Falling Edge
0.5
1.6
2.2
V
-Input Current
Input = 2.2V
100
250
A
High Output Level
Positive Phase/Freq. Error, Volts Below V
REF
0.2
0.5 V
Low Output Level
Negative Phase/Freq. Error
0.2
0.5
V
Mid Output Level
Zero Phase/Freq. Error, Percent of V
REF
47
50
53
%
High Level Maximum Source
Current
V
OUT
= 4.3V
2.0
8.0
mA
Low Level Maximum Sink Current
V
OUT
0.7V
2.0
5.0
mA
Mid Level Output Impedance
(Note 3)
I
OUT
= -200 to +200
A, T
J
= 25
C
4.5 6.0
7.5
k
Loop Amplifier
Non-Inv Reference Voltage
Percent of V
REF
47
50
53
%
Input Bias Current
Input = 2.5V
-0.8
-0.2
A
AVOL
60
75
dB
PSRR
+V
IN
= 8 to 15V
70
100
dB
Short Circuit Current
Source, V
OUT
= 0V
16
35
mA
Sink, V
OUT
= 5V
16
30
mA
UC1635
UC2635
UC3635
Note 3: These impedance levels will vary with T
J
at about 1700ppm/
C.
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, specifications hold for T
A
= 0
C to +70
C for the UC3635,
-25
C to +85
C for the UC2635 and -55
C to +125
C for the UC1635, +Vin = 12V. T
A
= T
J.
3
UC1635
UC2635
UC3635
UNITRODE CORPORATION
7 CONTINENTAL BLVD.
MERRIMACK, NH 03054
TEL. (603) 424-2410
FAX (603) 424-3460
Reference Divider Output Detail
Phase Detector Input Detail
Application and Operation Information
(For Additional Application Information see the UC1633 Data Sheet)
(Pin numbers refer to DIL and SOIC packages)
UDG-92012
UDG-92011-1
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Auxiliary Op-Amp
Input Offset Voltage
V
CM
= 2.5V
8
mV
Input Bias Current
V
CM
= 2.5V
-0.8
-0.2
A
Input Offset Current
V
CM
= 2.5V
.01
0.1
A
AVOL
70
120
dB
PSRR
+V
IN
= 8 to 15V
70
100
dB
CMRR
V
CM
= 0 to 10V
70
100
dB
Short Circuit Current
Source, V
OUT
= 0V
16
35
mA
Sink, V
OUT
= 5V
16
30
mA
ELECTRICAL CHARACTERISTICS (cont.):
Unless otherwise stated, specifications hold for T
A
= 0
C to +70
C for the
UC3635, -25
C to +85
C for the UC2635 and -55
C to +125
C for the UC1635, +Vin = 12V. T
A
= T
J.
4
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