u4289bm rev. a3, 07-mar-01 1 (9) am / fm - pll description the u4289bm is an integrated circuit in bicmos technology for frequency synthesizers. it performs all the functions of a pll radio tuning system and is controlled by an i 2 c bus. the device is designed for all frequency synthesizer applications in radio receivers, as well as rds ( r adio d ata s ystem ) applications. features reference oscillator up to 15 mhz two programmable 16 bit dividers adjustable from 2 to 65535 high signal/noise ratio fine tuning steps: am 1 khz fm 2 khz few external component required due to integrated loop-push-pull stage for am/fm ordering information extended type number package remarks U4289BM-AFP so16 plastic U4289BM-AFPg3 so16 plastic taping according to iec-286-3 block diagram r-divider n-divider i 2 c bus interface oscillator phase current sources am/fm 14 15 2 3 4 6 8 oscout oscin scl as fmosc amosc sda 5 71 16 swo1 11 12 13 9 10 pdam pdamo va pdfmo pdfm gnd2 gnd1 dd v 95 10822 switch switching output detector figure 1. block diagram
u4289bm rev. a3, 07-mar-01 2 (9) pin description 1 2 3 4 5 6 7 8 13 14 15 16 scl sda as swo1 gnd1 oscout oscin va pdamo pdam pdfm v dd 9 11 12 fmosc gnd 2 pdfmo amosc 10 95 10823 figure 2. pinning pin symbol function 1 v dd supply voltage 2 scl i 2 c bus clock 3 sda i 2 c bus data 4 as address selection 5 swo1 switching output 6 fmosc fm oscillator input 7 gnd 2 ground 2 (analog) 8 amosc am oscillator input 9 pdfm fm current output 10 pdfmo fm analog output 11 pdam am current output 12 pdamo am analog output 13 va analog supply voltage 14 oscin oscillator input 15 oscout oscillator output 16 gnd1 ground 1 (digital) functional description the u4289bm is controlled via the 2-wire i 2 c bus. for programming there are one module address byte, two sub- address bytes and five data bytes. the module address contains a programmable address bit a 1 which with address select input as (pin 4) makes it possible to operate two u4289bm in one system. if bit a 1 is identical with the status of the address select input as, the chip is selected . the subaddress determines which one of the data bytes is transmitted first. if subaddress of r-divider is trans- mitted, the sequence of the next data bytes is db 0 (status), db 1 and db 2. if subaddress of n-divider is transmitted, the sequence of the next data bytes is db 3 and db 4. the bit or ganisation of the module address, subaddress and 5 data bytes are shown in figure 6. each transmission on the i 2 c bus begins with the astarto- condition and has to be ended by the astopo- condition (see figure 7). the integrated circuit u4289bm has two separate inputs for am and fm oscillator. pre-amplified am and fm sig- nals are fed to the 16 bit n-divider via am/fm switch. am/fm switch is controlled by software. tuning steps can be selected by 16 bit r-divider. further there is a digi- tal memory phase detector. there are two separate current sources for am and fm amplifier (charge pump) as given in electrical characterisitics. it allows independent ad- justment of gain, whereby providing high current for high speed tuning and low current for stable tuning.
u4289bm rev. a3, 07-mar-01 3 (9) absolute maximum ratings parameters symbol value unit supply voltage pin 1 v dd 0.3 to +6 v input voltage pins 2, 3, 4, 6, 8, 14 and 15 v i 0.3 to v dd + 0.3 v output current pins 3 and 5 i o 1 to +5 ma output drain voltage pin 5 v od 15 v analog supply voltage pin 13 with 220 seriell resistance 2 minutes 1) v a v a 6 to 15 24 v v output current pins 9 and 12 i ao 1 to +20 ma ambient temperature range t amb 30 to +85 c storage temperature range t stg 40 to +125 c junction temperature t j 125 c electrostatic handling (modified mil std 883 d method 3015.7: all supply pins connected together) v esd 1000 v 1) corresponding our application circuit (page 7) thermal resistance parameters symbol value unit junction ambient r thja 160 k/w
u4289bm rev. a3, 07-mar-01 4 (9) electrical characteristics v dd = 5 v, v a = 10 v, t amb = 25 c, unless otherwise specified parameters test conditions / pin symbol min. typ. max. unit supply voltage pin 1 v dd 4.5 5.0 5.5 v quiescent supply current am-mode pin 1 fm-mode i dd 4.0 4.0 7.0 7.0 ma fm input sensitivity, r g = 50 fmosc f i = 70 to 120 mhz pin 6 v sfm 40 mv rms f i = 160 mhz pin 6 v sfm 150 mv rms am input sensitivity, r g = 50 amosc f i = 0.6 to 35 mhz pin 8 v sam 40 mv rms oscillator input sensitivity, r g = 50 oscin f i = 0.1 to 15 mhz pin 14 v sosc 100 mv rms phase detector pdfm output current 1 output current 2 pin 10 pin 10 i pdfm i pdfm 1600 400 2000 500 2400 600 a a leakage current pin 10 i pdfml 20 na phase detector pdam output current 1 output current 2 pin 11 pin 11 i pdam i pdam 160 40 200 50 240 60 a a leakage current pin 11 i pdaml 20 na analog output pdfmo, pdamo saturation voltage low high pins 9 and 12 i = 15 ma v satl v sath 9.5 200 9.95 400 mv v i 2 c bus scl, sda, as input voltage high low pins 2, 3 and 4 v ibus 3.0 0 v dd 1.5 v v output voltage acknowledge low pin 3 i sda = 3 ma v o 0.4 v clock frequency pin 2 f scl 100 khz rise time sda, scl pins 2 and 3 t r 1 s fall time sda, scl pins 2 and 3 t f 300 ns period of scl high low pin 2 high low t h t l 4.0 4.7 s s setup time start condition data stop condition time space 1) t ssta t sdat t sstop t wsta 4.7 250 4.7 4.7 s ns s s hold time start condition data t hsta t hdat 4.0 0 s s 1) this is a space of time where the bus must be free from data transmission and before a new transmission can be started.
u4289bm rev. a3, 07-mar-01 5 (9) 0 2 4 6 8 10 12 14 20 40 60 80 100 120 v ( mv ) f ifm ( mhz ) 13354 sfm v dd = 5.5 v 5.0 v 4.5 v t = 85 c 0 2 4 6 8 10 12 14 20 40 60 80 100 120 v ( mv ) f ifm ( mhz ) 13355 sfm v dd = 5.5 v 5.0 v 4.5 v t = 30 c figure 3. fm input sensitivity 1 10 100 0.1 1.0 10.0 100.0 v ( mv ) f iam ( mhz ) 13353 sam v dd = 5.5 v 5.0 v 4.5 v t = 85 c 1 10 100 0.1 1.0 10.0 100.0 v ( mv ) f iam ( mhz ) 13356 sam v dd = 5.5 v 5.0 v 4.5 v t = 30 c figure 4. am input sensitivity bus timing t wsta ps t hsta t l t r sda scl t hdat p t hsta t f t h t ssta t sstop 95 10122 p = stop, s = start t hdat figure 5. bus timing
u4289bm rev. a3, 07-mar-01 6 (9) bit organization msb lsb module address 1 1 0 0 1 0 0/1 0 a7 a6 a5 a4 a3 a2 a1 a0 subaddress (r-divider) x x x 0 0 1 x x subaddress (n-divider) x x x x 1 1 x x msb lsb data byte 0 (status) swo1 am/ fm pd ana pd pol pd cur d7 d6 d5 d4 d3 d2 d1 d0 data byte 1 2 15 r-divider 2 8 data byte 2 2 7 r-divider 2 0 data byte 3 2 15 n-divider 2 8 data byte 4 2 7 n-divider 2 0 low high am/fm fm-operation am-operation pd ana pd analog test pd pol negative polarity positive polarity pd cur output current 2 output current 1 figure 6.
u4289bm rev. a3, 07-mar-01 7 (9) transmission protocol msb lsb s address a7 a0 a subaddress r-divider a data 0 a data 1 a data 2 a p msb lsb s address a7 a0 a subaddress ndivider a data 3 a data 4 a a p s = start p = stop a = acknowledge figure 7. application circuit 16 123 4 u4289bm 56 7 8 15 14 13 12 11 10 9 4 mhz 27 pf 27 pf amosc fmosc 12k w 12k w 5v 100 nf 6...15 v 95 10824 110 w 110 w 100 m f 16 v c 1 *) c 5 *) r 1 *) r 2 *) c 2 *) 3 k w c 6 *) c 3 100 m f 6.3 v 27 w c 4 2.2 nf 100 nf 1 nf *) values depend on the step frequency and used varicaps figure 8. application circuit
u4289bm rev. a3, 07-mar-01 8 (9) recommendations for applications c 3 = 100 nf should be very close to pin 1 (v dd ) and pin 16 (gnd 1) gnd 2 (pin 7 analog ground) and gnd 1 (pin 16 digital ground) must be connected according to figure 8 4 mhz crystal must be very close to pin 14 and pin 15 components of the charge pump (c 1 /r 1 for am and c 2 /r 2 for fm) should be very close to pin 11 with respect to pin 10. pcb-layout 16 123 4 56 7 8 15 14 13 12 11 10 9 95 10825 c 1 c 3 c 4 v dd gnd c 2 figure 9. pcb layout package information 13036 technical drawings according to din specifications package so16 dimensions in mm 10.0 9.85 8.89 0.4 1.27 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2 16 9 18
u4289bm rev. a3, 07-mar-01 9 (9) ozone depleting substances policy statement it is the policy of atmel germany 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. atmel germany gmbh 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. atmel germany gmbh 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 atmel wireless & microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify atmel wireless & microcontrollers 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. data sheets can also be retrieved from the internet: http://www.atmelwm.com atmel germany gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 (0)7131 67 2594, fax number: 49 (0)7131 67 2423
|
