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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

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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

= 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

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

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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

µ

A

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

µ

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

µ

A

Double Edge Disable Input

Input Current

Input = 5V (Disabled)

150

500

µ

A

Input = 0V (Enabled)

-5.0

0.0

5.0

µ

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

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 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

µ

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

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 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

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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

µ

A

Input Offset Current

V

CM

 = 2.5V

.01

0.1

µ

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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©

 1999, Texas Instruments Incorporated