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UC1635
UC2635
UC3635
Phase Locked Frequency Co ntroller
•
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 fa mily of in tegra ted circui ts was designed for use in precision speed c ontrol 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 divider 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 oscillator and pro grammabl e divide rs. The osc illator operates using a broad
range of cr ystals, or, can functi on as a buffer stage to an external frequency source.
The phase dete ctor responds proportional ly 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 maximum drive sign als 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 confi gured to provi de necessary
loop filtering. The outputs of these op-amps will source or sink in excess
of 16mA, so they c an prov ide a low i mpedan ce cont rol signal to driving
circuits.
Additional features include a double edge option on the sense ampli fier
that can be used to double the loop r eference frequency for increased
loop bandwi dths. 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 (+VIN) . . . . . . . . . . . . . . . . . . . . +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 TA = 25°C, (Note 2) . . . . . . . 1000mW
Power Dissipation at TC = 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 gro un d, (Pin 16 ). C urre nt s
are positive into, negative out of, the specified terminals.
Note 2: Consult Unitrode Integrated Circu it s da ta bo ok for in formation regarding thermal specifications and limitations of
packages.
CONNECTION DIAGRAMS
ELECTRICAL
CHARACTERISTICS:
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Supply Current +VIN = 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. TA = 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
DIL–16 (Top View)
J & N Packages
SOIC–16 (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, TJ = 25°C 1.15 1.3 1.45 V
Input Impedance (Not e 2) V
IN
= VIB ±0.5V, TJ = 25°C 1.3 1 .6 1.9 kΩ
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 µA
Input = 0V (Div. by 4) -5.0 0.0 5.0
µ
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 µA
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 µA
Double Edge Disable Input
Input Current Input = 5V (Disabled) 150 500
µ
A
Input = 0V (Enabled) -5.0 0.0 5.0 µA
Threshold Voltage 0.5 1.6 2.2 V
Phase Detector
-Input Thresh old Detector Responds to Falling Edge 0.5 1.6 2.2 V
-Input Current Input = 2.2V 100 250
µ
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 Maxi mum 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 Outpu t Im pedance
(Note 3)
I
OUT
= -200 to +200µA, TJ = 25°C 4.5 6.0 7.5 k
Ω
Loop Amplifier
Non-Inv Reference Voltage Percent of V
REF
47 50 53 %
Input Bias Current Input = 2.5V -0.8 -0.2
µ
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 TJ at about 1700ppm/ °C.
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, specifications hold for TA = 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 CORPORATI ON
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424- 24 10 • 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 r efer to DIL and SOIC pa ckages)
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 µA
Input Offset Current V
CM
= 2.5V .01 0.1 µA
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 st ated, specificat io ns hol d fo r TA = 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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