telefunken semiconductors U2780B-AFP preliminary information rev. a1: 07.08.1995 1 (9) frequency synthesizer for uhf telecommunication systems, e.g. cellular radio and cordless telephone description / technology the programmable frequency synthesizer ic u2780b for m p controlled application is realized with a high speed bi- polar technology which is very suitable for combinations of fast ecl logic and low current i 2 c logic. the benefits are high input sensitivity in connection with low power consumption and therefore small packages (sso-20). this feature makes the device very suitable for cordless phones and handheld cellular radio sets up to 1.1 ghz. the ic is controlled by a 3-wire-bus with the inputs for clock, data and enable for programming the scaling fac- tors of the programmable counter, the reference counter and the prescaler. a tcxo can be connected to the oscillator input (oscin) as an alternative solution to the common crystal reference oscillator. in that case the oscillator output (oscout) should be left open. the charge pump output operates as a switch with limited max. current. the requirements of the pll loop can be determinated by the external low pass filter. the phase characteristic of the phase detector is convert- ible and so matchable to different frequency / tuning voltage characteristics. features very low current consumption (typ. 3 v/7.5 ma) supply voltage range 2.7 v 5.5 v max. input frequency 1.1 ghz programmable prescaler 64/65 or 128/129 controlled by 3-wire-bus with f clock up to 500 khz status output for pll lock/unlock condition very fast phase detector so-16 as well as sso-20 package esd protection in accordance with mil-std. 883 method 3015 class 2 block diagram / applications charge pump prescaler 64/65 128/129 v v s 18 bit shift register phase detector oscillator 14 bit reference scaler data clock osc gnd 1 bit latch load control ps cp ld mo rf enable 7 bit swallow counter 15 bit latch 11 bit main 18 bit latch counter cp 93 7785 e
telefunken semiconductors U2780B-AFP preliminary information rev. a1: 07.08.1995 2 (9) pin description so-16 pin symbol function 1 osc in n.c. oscillator input not connected 2 osc out oscillator output 3 vcp charge pump supply voltage 4 v s supply voltage 5 cp charge pump output 6 gnd ground 7 ld n.c. lock-detector output not connected 8 rf in vco input 9 clock n.c. 3-wire-bus clock not connected 10 data 3-wire-bus data 11 enable 3-wire-bus enable 12 ps phase inverting input 13 n.c. not connected 14 m out monitor output for f p and f r 15 n.c. (pcp) n.c. not connected not connected 16 n.c. (pcr) not connected pin description sso-20 pin symbol function 1 2 osc in n.c. oscillator input not connected 3 osc out oscillator output 4 vcp charge pump supply voltage 5 v s supply voltage 6 cp charge pump output 7 gnd ground 8 9 ld n.c. lock-detector output not connected 10 rf in vco input 11 12 clock n.c. 3-wire-bus clock not connected 13 data 3-wire-bus data 14 enable 3-wire-bus enable 15 ps phase inverting input 16 n.c. not connected 17 m out monitor output for f p and f r 18 19 n.c. (pcp) n.c. not connected not connected 20 n.c. (pcr) not connected absolute maximum ratings parameters symbol value unit supply voltage v s 0.3 to 6 v rf input v rf v s v oscillator input voltage v osci 1 v oscillator output voltage v osco 1.5 v bus input voltage v bus 6 v phase select input voltage v ps 6 v charge pump input voltage v cp 6 v ambient temperature t amb 40 to 85 c storage temperature t stg 40 to 125 c thermal resistance so-16 junction-ambient sso-20 r thja 110 140 k/w operating range supply voltage v s 2.7 to 5.5 v ambient temperature t amb 40 to 80 c
telefunken semiconductors U2780B-AFP preliminary information rev. a1: 07.08.1995 3 (9) electrical characteristics t amb = 25 c, v s = 2.7 to 5.5 v, unless otherwise specified. parameters test conditions / pins symbol min. typ. max. unit dc supply supply voltage 1 v s 2.7 5.5 v supply current v s = 3 v i s 7.5 ma supply voltage cp v cp v s 5.5 v supply current cp v cp = 5 v, pll i cp 1 a rf input input voltage f i = 200 to 1100 mhz r s = 50 w *) r s = 50 w *) v imin v imax 20 200 mv rm mv rmss frequency range f imin f imax 1100 50 1250 mhz mhz scaling factor prescaler s psc 64/128 scaling factors main counter s m 2 2047 scaling factors swallow counter s s 0 127 reference oscillator input voltage r s = 50 w *) r s = 50 w *) v imin v imax 20 200 mv rms mv rms frequency range f imin f imax 0,1 16 mhz mhz scaling factor reference counter s r 4 16383 3-wire bus (clock, data, enable) and ps high-input voltage v ih 1.5 0.9 v low-input voltage v il 0 0.4 v high-input current i ih 5 a low-input current i il 5 a monitor output (emitter follower) high-output voltage v s = 3 v v ih 2.1 2.2 v low-output voltage i mo = 0.5 ma v il 1.8 1.9 v charge pump output source current v cp = 5 v i source 1 ma sink current i sink 1 ma leakage current v cp = 5 v i leak 5 na lock detector output (open collector) saturation voltage i ld = 1 ma v sat 0.2 0.4 v cut-off current v ld = 5 v i cut 1 a *) rms voltage at 50
telefunken semiconductors U2780B-AFP preliminary information rev. a1: 07.08.1995 4 (9) functional description reference and programmable counter can be pro- grammed by the 3-wire bus (clock, data and enable). the data signal is transferred bit by bit during the rising edge into the shift register, starting with the msb-bit. as soon as the enable signal is in high condition the contents of the shift register will be taken over either into the 15 bit reference counter latch (c = h) or into the 18 bit latch of the programmable counter (c = l). reference counter (15-bit shift register) lsb msb c r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 psc c: control bit high psc: prescaler scaling factor bit: high 64/65 low 128/129 s psc = 64 or 128 r 0 to r 13 : these bits are setting the reference counter s r s r = r 0 * 2 0 + r 1 * 2 1 + to + r 12 * 2 12 + r 13 * 2 13 allowed scaling factors for s r : 2 to 16383 programmable counter (18bit shift register) lsb msb c s0 s1 s2 s3 s4 s5 s6 m0 m1 m2 m3 m4 m5 m6 m7 m8 m9 m10 c: control bit low s 0 to s 6 : these bits are setting the swallow counter s s . s s = s 0 * 2 0 + s 1 * 2 1 + ... + s 5 * 2 5 + s 6 * 2 6 allowed scaling factors for s s : 0 to 127, s s < s m m0 to m10: these bits are setting the main counter s m . s m = m 0 * 2 0 + m 1 * 2 1 + ... + m 9 * 2 9 + m 10 * 2 10 allowed scaling factors for s m : 2 to 2047 total scaling factor s p of the programmable counter s p = (s psc * s m ) + s s condition: s s < s m vco-frequency f vco = ((s psc * s m ) + s s ) * f refosc / s r
telefunken semiconductors U2780B-AFP preliminary information rev. a1: 07.08.1995 5 (9) timing 3-wire-bus c = 1 : reference scaler date 93 7787 e msb t 5 t 4 t 3 t 2 t 1 lsb c = 0 : prog. scaler data r 0 p 0 r 6 p 8 r 7 p 9 r 13 p 16 psc p 17 enable clock data all times t1 ... t5 > = 1 phase detector polarity the polarity of the phase detector can be changed with the ps input. depending on the ps input level the charge pump current will also be inverted. the monitor output signal mo (emitter follower output with ecl level) will be switched over from f p to f r simultaneously. ps = high or open ps = low cp mo cp mo f r > f p i sink f r i source f p f r < f p i source f r i sink f p f r = f p 0 f r 0 f p depending on the vco frequency versus tuning voltage characteristic the ps input has to be programmed as follows: for increasing tuning voltage and increasing frequency: ps = high or open decreasing frequency: ps = low. pulse diagram phase and lock detector v ld fp (fvco/tp) 93 7786 e cp fr (fosc/tr) the ld output is in unlocked condition at low level and the pulse width is in reference to the phase respectively frequency difference at the phase detector. if the phase de- tector output pulses are smaller than 100 ns the ld output goes high and indicates alocko condition.
telefunken semiconductors U2780B-AFP preliminary information rev. a1: 07.08.1995 6 (9) test circuit input sensitivity 93 7788 e 1 v = 3 v s monitor frequency counter rf test generator data clock enable 10 k u 2780 b 1n 10 n typical input sensitivity 93 7789 e rms mv 65 60 55 50 45 40 35 30 +10 + 5 25 20 15 10 5 frequency ( mhz ) dbm ( 50 ohm) 0 200 400 600 800 1000 0 1600 1400 1200 .1 .2 1 2 5 10 20 50 100 200 500 1000 .5 ( 50 ohm)
telefunken semiconductors U2780B-AFP preliminary information rev. a1: 07.08.1995 7 (9) application circuit 93 7790 e loop filter 1 1 alternatively to extern tcxo tuning voltage 10n 10n 2*10p ld vco vco u 2780 b 1n 10k 10n enable clock data v = 3 to 6 v s v = 3 v s
telefunken semiconductors U2780B-AFP preliminary information rev. a1: 07.08.1995 8 (9) dimensions in mm package: so-16 (u 2780 b-afp) package: sso-20 (u 2780 b-afs)
telefunken semiconductors U2780B-AFP preliminary information rev. a1: 07.08.1995 9 (9) ozone depleting substances policy statement it is the policy of temic telefunken microelectronic gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( odss). the montreal protocol ( 1987) and its london amendments ( 1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. temic telefunken microelectronic gmbh semiconductor division has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2 . class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency ( epa ) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c ( transitional substances ) respectively. temic can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. we reserve the right to make changes to improve technical design and may do so without further notice . parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use temic products for any unintended or unauthorized application, the buyer shall indemnify temic against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. temic telefunken microelectronic gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 ( 0 ) 7131 67 2831, fax number: 49 ( 0 ) 7131 67 2423
|
