ATR4253

Features • Highly Integrated - All-in-one Active Antenna IC • Operating Frequency Range: 50 to 900MHz • • • • • • • • • • – Main Application 76 to 108MHz (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 Integrated Circuit Solution for Active Antennas Atmel ATR4253 Summary 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 regulator and two driver stages for external PIN diodes. The Atmel ATR4253 is based on BICMOS technology. The device is designed in particular for car applications and is suitable for active antennas located in several positions within the car such as bumpers, windscreen, mirrors or windows. Figure 1-1. Block Diagram RFB 12 RFE 11 PD2 10 RFC 9 FM Amplifier BIAS 13 Voltage Supply AGC (FM) 8 DET GND2 14 7 TC REF 15 6 VS PD1 16 Antenna Detection Over Voltage 5 GND1 1 2 3 4 ANTENNA VSTART OVDET VREGO SENSE NOTE: This is a summary document. The complete document is available under NDA. For more information, please contact your local Atmel sales office. 9194CS–AUDR–10/10 2. Pin Configuration Figure 2-1. Pinning VQFN 3x3 / 16 Pins GND2 14 16 15 13 12 ANT SENSE VSTART OVDET VREGO BIAS REF PD1 1 2 3 4 5 6 7 8 RFB RFE PD2 RFC Atmel ATR4253 11 10 9 GND1 TC Table 2-1. Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Paddle Pin Description Symbol ANT SENSE VSTART OVDET VREGO GND1 VS TC DET RFC PD2 RFE RFB BIAS GND2 REF PD1 GND Function Antenna sense input Comparator input of voltage detector Overvoltage detection input Voltage regulator output Ground voltage regulator Supply voltage AGC time constant AGC level detector input Amplifier Collector (NPN) 2nd AGC output for pin diode Amplifier emitter (NPN) Amplifier base (NPN) Bias voltage (2.7V) Ground FM Reference voltage (6V) 1st FM AGC output for pin diode Ground paddle 2 Atmel ATR4253 9194CS–AUDR–10/10 DET VS 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 transistor 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 reasonable 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 impedance can be adjusted by modifying the external components. The bias voltage (BIAS) for the base of the NPN transistor is derived from an integrated voltage 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. 3 9194CS–AUDR–10/10 3.3 Supply Voltage Regulator The driving voltage for an external power transistor 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 current reduction to the unit that provides and monitors the supply current for the antenna amplifier (e.g., the car radio). 4 Atmel ATR4253 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 those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Supply voltage Antenna sense current Comparator input current Overvoltage detector Collector of FM amplifier Power dissipation Junction temperature Ambient temperature Storage temperature ESD HBM All Pin 6 1 2 3 9 Symbol VS ANT SENSE VSTART OVDET RFC Ptot Tj Tamb Tstg VHBM –40 –50 –2 Min. –0.3 –500 0 –0.3 3 Max. +12 +500 2 +3.3 16 700 150 +115 +150 +2 Unit V µA mA V V mW °C °C °C kV 5. Thermal Resistance Parameters Junction ambient, soldered on PCB, dependent on PCB layout Symbol RthJA Value 40 Unit K/W 6. Operating Range Parameters Supply voltage Supply voltage FM emitter current Test Conditions Normal operation Performance may be reduced, no malfunction Thermal condition Pin 6 6 11 Symbol VS VS IRFE Min. 7.5 7 Typ. 10 Max. 11 11 35 Unit V V mA 5 9194CS–AUDR–10/10 7. Electrical Characteristics VS = 10 V, Tamb = 25°C, unless otherwise specified. No. Parameters Test Conditions AGC OFF AGC ON ; includes 7 mA pin diode current 1.1 Supply current Tamb = –40 to +115°C; AGC ON; includes 7mA pin diode current and 31mA RF current Common base Common emitter f = 100MHz f = 100MHz f = 100MHz Common base Common base f = 100MHz, common emitter Common emitter Common emitter 3dB corner, common emitter Pin VS VS Symbol Is Is Min. Typ. 12 19 Max. Unit mA mA Type* B B VS, RFC Is, IRFC 50 70 mA C 2 2.3 2.4 2.6 2.7 2.8 2.9 RF Amplifier Supply current(1) Supply current (2) RFC RFC RF IN RF OUT RF IN, RF OUT RF OUT RF OUT RF OUT RF OUT RF OUT RF OUT IRFC IRFC RFMIN RFMOUT G 31 35 50 50 5.2 146 1.6 mA mA Ω Ω dB dBµV dB dB dBµV dB MHz B A C C C C C B B C C Input resistance Output resistance Power gain OIP3 at FMOUT 2.10 NF 2.11 Power gain 2.12 OIP3 at FMOUT 2.13 NF Maximum operating 2.14 frequency 3 3.4 3.5 3.6 3.7 4 4.1 4.2 AGC Maximum pin diode current Maximum pin diode current Input resistance Input capacitance Output voltage of regulator Ripple rejection of regulator G 13.5 140 3.5 450 AGC active, 115°C AGC not active PD1 PD2 DET RDET CDET 12 12 17 1.5 19 mA mA 25 2.0 kΩ pF D A C C f = 100MHz Battery voltage VB = 14V 100Hz, VB > VS + 1V DET Voltage Regulator / Monitor VS VB, RF OUT 9.5 40 10 50 10.5 V dB A C *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. Current defined by R11= 68Ω 2. Current defined by R11= 56Ω 6 Atmel ATR4253 9194CS–AUDR–10/10 Atmel ATR4253 8. Ordering Information Extended Type Number ATR4253-PVPW ATR4253-PVQW Package VQFN 3x3 / 16L VQFN 3x3 / 16L Remarks Taped on reel, 2k volume Taped on reel, 8k volume 9. Package Information Top View D 16 1 PIN 1 ID E technical drawings according to DIN specifications A1 A3 A Side View Bottom View D2 Symbol A COMMON DIMENSIONS (Unit of Measure = mm) MIN 0.8 0.0 0.15 2.9 1.7 2.9 1.7 0.3 0.18 NOM 0.9 0.02 0.2 3 1.75 3 1.75 0.4 0.25 0.5 BSC MAX 1 0.05 0.25 3.1 1.8 3.1 1.8 0.5 0.32 NOTE 5678 4 3 e A1 A3 2 1 b 9 10 11 12 16 15 14 13 D E2 D2 E E2 L b e L Package Drawing Contact: packagedrawings@atmel.com TITLE Package: VQFN_3x3_16L Exposed pad 1.75 x 1.75 11/11/09 DRAWING NO. REV. 6.543-5164.01-4 1 7 9194CS–AUDR–10/10 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. 9194CS-AUDR-10/10 9194BS-AUDR-09/10 History • Ordering Information table changed • Section 6 “Operating Range” on page 5 changed 8 Atmel ATR4253 9194CS–AUDR–10/10 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: (+1)(408) 441-0311 Fax: (+1)(408) 487-2600 Atmel Asia Limited Unit 01-5 & 16, 19/F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon HONG KONG Tel: (+852) 2245-6100 Fax: (+852) 2722-1369 Atmel Munich GmbH Business Campus Parkring 4 D-85748 Garching b. Munich GERMANY Tel: (+49) 89-31970-0 Fax: (+49) 89-3194621 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 JAPAN Tel: (+81) (3) 3523-3551 Fax: (+81) (3) 3523-7581 © 2010 Atmel Corporation. All rights reserved. / Rev.: 9194CS–AUDR–10/10 Atmel®, Atmel logo and combinations thereof, and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. 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