note: this is a summary document. the complete document is available under nda. for more information, please contact your local atmel sales office. features ? highly integrated - all- in-one active antenna ic ? operating frequency range: 50 to 900mhz ? main application 76 to 108m hz (broadcast fm worldwide) ? integrated agc ? integrated driver for pin diodes ? integrated power supply regulator ? integrated antenna sensor ? high dynamic range ? excellent noise performance ? high intercept point 3rd order ? rf amplifier adjustable to various cable impedances ? low noise output voltage ? low power consumption 1. description the atmel ? ATR4253 is a highly integrated high-performance ic for active antenna amplification. the device has a built-in agc, antenna detection, a power supply regu- lator and two driver stages for external pin diodes. the atmel ATR4253 is based on bicmos technology. the device is designed in par- ticular for car applications and is suitable for active antennas located in several positions within the car such as bum pers, windscreen, mirrors or windows. figure 1-1. block diagram 12 3 4 ovdet vrego v s ta rt antenna s en s e 1 3 14 15 16 pd1 bia s gnd2 ref 8 7 6 5 det gnd1 v s tc 12 11 10 rfc pd2 rfe rfb 9 fm amplifier volt a ge su pply agc (fm) over volt a ge antenn a detection integrated circuit solution for active antennas atmel ATR4253 summary 9194cs?audr?10/10
2 9194cs?audr?10/10 atmel ATR4253 2. pin configuration figure 2-1. pinning vqfn 3x3 / 16 pins gnd1 v s tc det pd1 ref gnd2 bia s ant s en s e v s ta rt ovdet vrego rfb rfe pd2 rfc 567 8 12 11 10 9 1 2 3 4 16 15 14 1 3 atmel atr425 3 table 2-1. pin description pin symbol function 1 ant sense antenna sense input 2 vstart comparator input of voltage detector 3 ovdet overvoltage detection input 4 vrego voltage regulator output 5 gnd1 ground voltage regulator 6 vs supply voltage 7 tc agc time constant 8 det agc level detector input 9 rfc amplifier collector (npn) 10 pd2 2 nd agc output for pin diode 11 rfe amplifier emitter (npn) 12 rfb amplifier base (npn) 13 bias bias voltage (2.7v) 14 gnd2 ground fm 15 ref reference voltage (6v) 16 pd1 1 st fm agc output for pin diode paddle gnd ground paddle
3 9194cs?audr?10/10 atmel ATR4253 3. functional description the atmel ? ATR4253 is a highly integrated antenna amplifier with a broad range of features and functions. it compensates cable losses between the antenna and the car radio, which is usually placed far away from the antenna. the device can be used in the frequency range of 50 up to 900mhz (i.e. fm, dab (+), dmb, dvb-t, isdb-t, etc.) and has the flexibility to address different antenna types (e.g., glass, windscreen, roof antennas). a separate automatic gain control (agc) function is integrated in order to avoid overdriving the rf amplifier at large signal conditions. the integrated pin diode drivers help to reduce the external component cost and to minimize the board space. the external component cost can be further reduced as the voltage regulation stage is also integrated. this stage provides overvoltage protection and current limitation. an external tran- sistor is used as power driver for this stage. 3.1 rf amplifier stage the rf amplifier is realized with a high-performance npn transistor. this allows the use of an amplifier configuration which is optimized for the individual application requirements. for low-cost applications, the common emitter configuration enables good performance at reason- able bom cost. for high-end applications, a common base configuration with transformer feedback provides high ip3 and low noise figures at reasonable current consumption. in both configurations, gain, input and output impedanc e can be adjusted by modifying the external components. the bias voltage (bias) for the base of the npn transistor is derived from an integrated volt- age reference and has a ptat (proportional to absolute temperature) behavior. the bias current of the rf amplifier is defined by an external resistor and is kept constant over temperature. 3.2 agc the ic is equipped with an agc functionality to prevent overdriving the amplifier in case the amplifier is operated at strong antenna signals, e.g., near transmitters. it is possible to realize an additional antenna amplifier path with integrated agc and external rf transistor. the bandwidth of the integrated agc circuit is 900mhz. the amplifier output (rfc) is connected to a capacitive voltage divider and the divided signal is applied to the agc level detector at pin det. this level detector input is optimized for low distortion. the rectified signal is compared against an internal reference. the divider ratio of the external voltage divider defines the agc?s threshold. if the threshold is reached, pin pd1 drives a positive current through one or two external pin diodes in shunt configuration. in case the limiting range of the shunt configuration is not sufficient, an additional pin diode in serial configuration can be added and controlled via pin pd2. the current from pd2 through the serial pin diode is opposite to the current of pd1. this helps to limit the amplifier input signal and thus to prevent the fm amplifier from signal overdrive. the drivers required for the external pin diode (s) are built-in into the ATR4253 ic, which reduces the bom cost and the application size.
4 9194cs?audr?10/10 atmel ATR4253 3.3 supply voltage regulator the driving voltage for an external power tran sistor is provided by an integrated regulator circuit. an overvoltage protection circuit detects overvoltage condition and switches off the amplifier and agc circuit in order to reduce current consumption and avoid thermal overload. 3.4 antenna sensor the atmel ? ATR4253 provides a built-in antenna sensor that detects if the antenna is properly connected to the amplifier module. if no antenna is detected, the amplifier and agc circuit are switched off to signal this error via supply curr ent reduction to the unit that provides and moni- tors the supply current for the antenna amplifier (e.g., the car radio).
5 9194cs?audr?10/10 atmel ATR4253 4. absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng conditions for extended periods may affect device reliability . parameters pin symbol min. max. unit supply voltage 6 v s ?0.3 +12 v antenna sense current 1 ant sense ?500 +500 a comparator input current 2 vstart 0 2 ma overvoltage detector 3 ovdet ?0.3 +3.3 v collector of fm amplifier 9 rfc 3 16 v power dissipation p tot 700 mw junction temperature t j 150 c ambient temperature t amb ?40 +115 c storage temperature t stg ?50 +150 c esd hbm all v hbm ?2 +2 kv 5. thermal resistance parameters symbol value unit junction ambient, soldered on pcb, dependent on pcb layout r thja 40 k/w 6. operating range parameters test conditions pin symbol min. typ. max. unit supply voltage normal operation 6 v s 7.5 10 11 v supply voltage performance may be reduced, no malfunction 6v s 711v fm emitter current thermal condition 11 i rfe 35 ma
6 9194cs?audr?10/10 atmel ATR4253 7. electrical characteristics v s = 10 v, t amb = 25c, unless otherwise specified. no. parameters test conditions pi n symbol min. typ. max. unit type* 1.1 supply current agc off vs is 12 ma b agc on ; includes 7 ma pin diode current vs is 19 ma b t amb = ?40 to +115c; agc on; includes 7ma pin diode current and 31ma rf current vs, rfc is, i rfc 50 70 ma c 2 rf amplifier 2.3 supply current (1) common base rfc i rfc 31 ma b 2.4 supply current (2) common emitter rfc i rfc 35 ma a 2.6 input resistance f = 100mhz rf in r fmin 50 c 2.7 output resistance f = 100mhz rf out r fmout 50 c 2.8 power gain f = 100mhz rf in, rf out g 5.2 db c 2.9 oip3 at fmout common base rf out 146 dbv c 2.10 nf common base rf out 1.6 db c 2.11 power gain f = 100mhz, common emitter rf out g 13.5 db b 2.12 oip3 at fmout common emitter rf out 140 dbv b 2.13 nf common emitter rf out 3.5 db c 2.14 maximum operating frequency 3db corner, common emitter rf out 450 mhz c 3agc 3.4 maximum pin diode current agc active, 115c pd1 12 19 ma d 3.5 maximum pin diode current agc not active pd2 12 ma a 3.6 input resistance det r det 17 25 k c 3.7 input capacitance f = 100mhz det c det 1.5 2.0 pf c 4 voltage regulator / monitor 4.1 output voltage of regulator battery voltage v b = 14v vs 9.5 10 10.5 v a 4.2 ripple rejection of regulator 100hz, v b > v s + 1v vb, rf out 40 50 db c *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter notes: 1. current defined by r11= 68 2. current defined by r11= 56
7 9194cs?audr?10/10 atmel ATR4253 9. package information 8. ordering information extended type number package remarks ATR4253-pvpw vqfn 3x3 / 16l taped on reel, 2k volume ATR4253-pvqw vqfn 3x3 / 16l taped on reel, 8k volume title drawing no. rev. packa g e drawin g contact: p a ck a gedr a wing s @ a tmel.com 6.54 3 -5164.01-4 common dimen s ion s (unit of me asu re = mm) min nom note max s ymbol 1 expo s ed p a d 1.75 x 1.75 packa g e: vqfn_ 3 x 3 _16l 11/11/09 s pecific a tion s a ccording to din technic a l dr a wing s top view d 1 16 pin 1 id e e b 0.02 0.05 0.0 a1 33 .1 2.9 e 0.25 0. 3 2 0.1 8 b 0.5 b s c e 0.4 0.5 0. 3 l 1.75 1. 8 1.7 e2 1.75 1. 8 1.7 d2 33 .1 2.9 d 0.2 0.25 0.15 a 3 0.9 1 0. 8 a s ide view a 3 a a1 e2 bottom view d2 l 9 4 3 2 1 10 11 12 567 8 16 15 14 1 3
8 9194cs?audr?10/10 atmel ATR4253 10. revision history please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. revision no. history 9194cs-audr-10/10 ? ordering information table changed 9194bs-audr-09/10 ? section 6 ?operating range? on page 5 changed
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