7/97 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 detectors 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 devices 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 detectors 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 dilC16 (top view) j & n packages soicC16 (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 w 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 m a input = 0v (div. by 4) -5.0 0.0 5.0 m 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 m 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 m a double edge disable input input current input = 5v (disabled) 150 500 m a input = 0v (enabled) -5.0 0.0 5.0 m 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 m 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 m a, t j = 25 c 4.5 6.0 7.5 k w loop amplifier non-inv reference voltage percent of v ref 47 50 53 % input bias current input = 2.5v -0.8 -0.2 m 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 m a input offset current v cm = 2.5v .01 0.1 m 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
important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage (acritical applicationso). ti semiconductor products are not designed, authorized, or warranted to be suitable for use in life-support devices or systems or other critical applications. inclusion of ti products in such applications is understood to be fully at the customer's risk. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 1999, texas instruments incorporated
|
