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 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. Atmel ATR4253 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. Summary Figure 1-1. Block Diagram RFB RFE PD2 RFC 12 11 10 9 FM Amplifier BIAS 13 GND2 14 REF 15 PD1 16 Voltage Supply AGC (FM) Antenna Detection 1 Over Voltage 2 3 4 ANTENNA VSTART OVDET VREGO SENSE 8 DET 7 TC 6 VS 5 GND1 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 Table 2-1. 2 2 OVDET 3 VREGO 4 REF GND2 BIAS 15 14 13 Atmel ATR4253 5 6 7 8 DET VSTART 16 TC 1 VS ANT SENSE PD1 Pinning VQFN 3x3 / 16 Pins GND1 Figure 2-1. 12 RFB 11 RFE 10 PD2 9 RFC Pin Description Pin Symbol 1 ANT SENSE Function 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 Antenna sense input 8 DET AGC level detector input 9 RFC Amplifier Collector (NPN) 10 PD2 2nd 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 1st FM AGC output for pin diode Paddle GND Ground paddle Atmel ATR4253 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 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 Pin Symbol Min. Max. Unit Supply voltage 6 VS –0.3 +12 V Antenna sense current 1 ANT SENSE –500 +500 µA 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 Ptot 700 mW Junction temperature Tj 150 °C Ambient temperature Tamb –40 +115 °C Tstg –50 +150 °C VHBM –2 +2 kV Power dissipation Storage temperature ESD HBM All 5. Thermal Resistance Parameters Junction ambient, soldered on PCB, dependent on PCB layout Symbol Value Unit RthJA 40 K/W 6. Operating Range Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Supply voltage Normal operation 6 VS 7.5 10 11 V Supply voltage Performance may be reduced, no malfunction 6 VS 7 11 V FM emitter current Thermal condition 11 IRFE 35 mA 5 9194CS–AUDR–10/10 7. Electrical Characteristics VS = 10 V, Tamb = 25°C, unless otherwise specified. No. 1.1 2 Parameters Supply current Test Conditions Pin Symbol AGC OFF VS Is AGC ON ; includes 7 mA pin diode current VS Tamb = –40 to +115°C; AGC ON; includes 7mA pin diode current and 31mA RF current Min. Typ. Max. Unit Type* 12 mA B Is 19 mA B VS, RFC Is, IRFC 50 mA C Common base RFC IRFC 31 mA B Common emitter RFC IRFC 35 mA A f = 100MHz RF IN RFMIN 50 Ω C Ω C 70 RF Amplifier 2.3 Supply current(1) 2.4 Supply current (2) 2.6 Input resistance 2.7 Output resistance f = 100MHz RF OUT RFMOUT 50 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 dBµV C 2.10 NF Common base RF OUT 1.6 dB C 2.11 Power gain f = 100MHz, common emitter RF OUT 13.5 dB B 2.12 OIP3 at FMOUT Common emitter RF OUT 140 dBµV B 2.13 NF Common emitter RF OUT 3.5 dB C Maximum operating 2.14 frequency 3dB corner, common emitter RF OUT 450 MHz C mA D mA A 3 G AGC 3.4 Maximum pin diode current AGC active, 115°C PD1 12 3.5 Maximum pin diode current AGC not active PD2 12 3.6 Input resistance 3.7 Input capacitance 4 f = 100MHz 19 DET RDET 17 25 kΩ C DET CDET 1.5 2.0 pF C 10.5 V A dB C Voltage Regulator / Monitor 4.1 Output voltage of regulator Battery voltage VB = 14V 4.2 Ripple rejection of regulator 100Hz, VB > VS + 1V VS 9.5 10 VB, RF OUT 40 50 *) 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 Package Remarks ATR4253-PVPW VQFN 3x3 / 16L Taped on reel, 2k volume ATR4253-PVQW VQFN 3x3 / 16L Taped on reel, 8k volume 9. Package Information Top View D 16 1 E technical drawings according to DIN specifications A A3 Side View A1 PIN 1 ID Bottom View COMMON DIMENSIONS D2 (Unit of Measure = mm) 4 3 9 10 11 12 e 2 E2 5 6 7 8 MIN NOM MAX A 0.8 0.9 1 A1 0.0 0.02 0.05 A3 0.15 0.2 0.25 D 2.9 3 3.1 D2 1.7 1.75 1.8 E 2.9 3 3.1 E2 1.7 1.75 1.8 L 0.3 0.4 0.5 b e 0.18 0.25 0.5 BSC 0.32 NOTE b 1 Symbol L 16 15 14 13 Package Drawing Contact: email@example.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. 8 Revision No. History 9194CS-AUDR-10/10 • Ordering Information table changed 9194BS-AUDR-09/10 • Section 6 “Operating Range” on page 5 changed 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. 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