ATR4253C Integrated Circuit Solution for Active Antennas DATASHEET Features ● Highly integrated - All-in-one active antenna IC ● Operating frequency range: 50MHz to 900MHz ● Main application 76MHz 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 9265C-AUDR-11/14 1. Description The Atmel® ATR4253C 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 ATR4253C 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 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 2 ATR4253C [DATASHEET] 9265C–AUDR–11/14 8 DET 7 TC 6 VS 5 GND1 Pin Configuration Table 2-1. 2 OVDET 3 VREGO 4 REF GND2 BIAS 15 14 13 Atmel ATR4253C 5 6 7 8 DET VSTART 16 TC 1 VS ANT SENSE PD1 Figure 2-1. Pinning QFN 3x3 / 16 Pins GND1 2. 12 RFB 11 RFE 10 PD2 9 RFC Pin Description Pin Symbol Function 1 ANT SENSE 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 2nd AGC output for pin diode Antenna sense input 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 ATR4253C [DATASHEET] 9265C–AUDR–11/14 3 3. Functional Description The Atmel® ATR4253C 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 50MHz 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 Atmel ATR4253C IC, which reduces the BOM cost and the application size. 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 ATR4253C 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 ATR4253C [DATASHEET] 9265C–AUDR–11/14 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 Power dissipation Ptot 700 mW Junction temperature Tj 150 °C Ambient temperature Tamb –40 +115 °C Storage temperature Tstg –50 +150 °C VHBM –2 +2 kV ESD HBM 5. All Thermal Resistance Parameters Junction ambient, soldered on PCB, dependent on PCB layout 6. Symbol Value Unit RthJA 40 K/W 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 ATR4253C [DATASHEET] 9265C–AUDR–11/14 5 7. Electrical Characteristics See test circuit (Figure 8-2 on page 9), VS = 10V, Tamb = 25°C, unless otherwise specified. No. 1.1 Parameters Supply current Test Conditions Pin Symbol Unit Type* AGC OFF VS Is 12 mA B AGC ON, includes 7mA pin diode current VS Is 19 mA B Antenna sense error detected VS Is Over voltage VS Tamb = –40 to +115°C; AGC ON; includes 7mA pin diode current and 31mA RF current Min. 15 Typ. Max. 20 25 mA A Is 10 14.9 mA A VS, RFC Is, IRFC 50 70 mA C 2.8 3.1 V A 3 mA B A 1.2 Bias voltage output BIAS VBIAS 2.5 1.3 Output current of bias voltage BIAS IBIAS 0 1.5 Bias voltage output 1kΩ output resistor REF VREF 5.7 6 6.3 V 2 RF Amplifier 2.1 Emitter voltage T = 25°C RFE 2.0 2.1 2.2 V A 2.2 Emitter voltage T = –40°C to +115°C RFE 1.9 2.1 2.3 V C 2.3 Supply current(1) Common base RFC IRFC 31 mA B 2.4 Supply current (2) Common emitter RFC IRFC 35 mA A 2.5 Maximum output voltage Vs = 10V RFC Vpp C 2.6 Input resistance f = 100MHz RF IN RFMIN 50 Ω C 2.7 Output resistance f = 100MHz RF OUT RFMOUT 50 Ω 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 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 3dB corner, common emitter RF OUT MHz C 87 89 dBµV dBµV B C V B 1 µA B mA D mA A 2.14 3 Maximum operating frequency 12 G 450 AGC 3.1 AGC input voltage threshold FM range: f = 100MHz Extended: f = 900MHz 3.2 Saturation voltage 10mA 3.3 Leakage current 3.4 Maximum pin diode current AGC active, 115°C PD1 12 3.5 Maximum pin diode current AGC not active PD2 12 DET Vth1,100 Vthl,900 83 81 PD1,2 85 85 VS – 2.0 PD1,2 19 *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 6 1. Current defined by R11= 68Ω 2. Current defined by R11= 56Ω ATR4253C [DATASHEET] 9265C–AUDR–11/14 7. Electrical Characteristics (Continued) See test circuit (Figure 8-2 on page 9), VS = 10V, Tamb = 25°C, unless otherwise specified. No. Parameters 3.6 Input resistance 3.7 Input capacitance 3.8 3.9 4 Test Conditions Pin Symbol Min. DET RDET f = 100MHz DET CDET IP3 Pin 8 FM 100MHz + 105MHz, VDET = 120dBµV DET Transconductance dIFMTC / dVFMDET TC DET Typ. Max. Unit Type* 17 25 kΩ C 1.5 2.0 pF C dBµV C 150 0.35 0.5 0.8 mA/V (rms) B VS 9.5 10 10.5 V A VB, RF OUT 40 50 dB C 1.6 V A % C V C dITC / dVDET Voltage Regulator / Monitor 4.1 Output voltage of regulator Battery voltage VB = 14V 4.2 Ripple rejection of regulator 100Hz, VB > VS + 1V 4.3 Threshold for overvoltage detection OVDET 4.4 Hysteresis of overvoltage detection OVDET 5 Antenna Sensor 5.1 Antenna monitor range RSENSE = 22kΩ, antenna detected ANT SENS 1.8 5 0 to 3 6 to 16 *) 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 ATR4253C [DATASHEET] 9265C–AUDR–11/14 7 8. Application Circuits Figure 8-1. Common Emitter Configuration 1SV264 D1 FMIN L4* 820nH C10* C9 2.2nF 2.2nF *optional D2* C17 2.2nF C11 C8 R9 10nF 2.2nF 560Ω FM-OUT C7 27pF C13 C12 100nF 1nF L3 R11 56Ω C18 C16 2.2nF 22pF 560nH R8 100Ω L2 R13 15Ω 120nH R14 0Ω 1 kΩ R12 1kΩ R10* 2 1 Jumper2 J2 L1 120nH C6 1.2pF 12 11 10 9 IC1 Atmel ATR4253C 14 15 7 C4 100nF 6 16 +VS 5 1 C15 C5 2.2pF 8 13 2 3 4 220nF C3 1nF R4 R2 2 1 Jumper2 J1 27kΩ 2.7kΩ 18kΩ 22kΩ R1 R3 R5 R7 5.1kΩ 100Ω C14 220nF R6 VB GND 8 ATR4253C [DATASHEET] 9265C–AUDR–11/14 T1 2SB1122 2.2Ω + C1 10µF C2 100nF Figure 8-2. Common Base Configuration C8 1SV264 D1 FMIN 2.2nF C10 C9 2.2nF 2.2nF T3 L2 120nH C11 1 6 3 4 C16 22pF FM-OUT C7 10nF R12 1kΩ L1 120nH C13 C12 100nF 1nF R8 100Ω R9 10Ω L1 120nH C6 1.2pF 12 11 10 9 13 IC1 Atmel ATR4253C 14 15 16 7 C4 100nF 6 +VS 5 1 C15 C5 2.2pF 8 2 3 4 220nF C3 1nF R4 R2 2.7kΩ 18kΩ R1 2 1 Jumper2 J1 27kΩ Jumper2 J2 27pF R11 68Ω 22kΩ 2 1 R3 R5 R7 C14 5.1kΩ 100Ω 220nF R6 VB GND T1 2SB1122 2.2Ω + C1 C2 10µF 100nF ATR4253C [DATASHEET] 9265C–AUDR–11/14 9 Figure 8-3. Recommended Footprint 3.2 9 x Ø 0.3 1.75 1.425 0.875 0.325 Pin 1 0.225 1.0 All dimensions in mm 0.25 0.5 10 ATR4253C [DATASHEET] 9265C–AUDR–11/14 9. Internal Circuitry Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown) Pin Symbol 1 ANT SENSE Function 1 2 2 VSTART 3 OVDET 3 4 4 VREGO 5, 14 GND1, GND2 6 VS 5, 14 6 VS 7 TC 7 ATR4253C [DATASHEET] 9265C–AUDR–11/14 11 Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown) (Continued) Pin Symbol 8 DET Function 8 9 9 RFC 10, 16 PD1, PD2 10, 16 11, 13 RFE, BIAS 11, 13 12 RFB 15 REF 12 15 12 ATR4253C [DATASHEET] 9265C–AUDR–11/14 10. Ordering Information Extended Type Number Package Remarks MOQ ATR4253C-PVQW-1 VQFN 3x3 / 16L Taped and reeled 8000 pieces Package Information Top View D 16 E 1 PIN 1 ID technical drawings according to DIN specifications A A3 Side View A1 Dimensions in mm Bottom View D2 5 6 7 8 COMMON DIMENSIONS 4 3 9 10 11 12 2 E2 (Unit of Measure = mm) e 1 b 11. L 16 15 14 13 Symbol MIN NOM MAX A 0.8 0.85 0.9 A1 A3 0 0.16 0.035 0.21 0.05 0.26 D 2.9 3 3.1 D2 1.6 1.7 1.8 E 2.9 3 3.1 E2 1.6 1.7 1.8 L 0.35 0.4 0.45 b e 0.2 0.25 0.5 0.3 NOTE 05/20/14 TITLE Package Drawing Contact: firstname.lastname@example.org Package: QFN_3x3_16L Exposed pad 1.7x1.7 GPC DRAWING NO. REV. 6.543-5186.01-4 1 ATR4253C [DATASHEET] 9265C–AUDR–11/14 13 12. 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. 9265C-AUDR-11/14 9265B-AUDR-08/14 14 ATR4253C [DATASHEET] 9265C–AUDR–11/14 History • Section 10 “Ordering Information” on page 13 updated • Section 11 “Package Information” on page 13 updated • Put datasheet in the latest template XXXXXX Atmel Corporation 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 | www.atmel.com © 2014 Atmel Corporation. / Rev.: 9265C–AUDR–11/14 Atmel®, Atmel logo and combinations thereof, Enabling Unlimited Possibilities®, and others are registered trademarks or trademarks of Atmel Corporation in U.S. and other countries. Other terms and product names may be trademarks of others. DISCLAIMER: The information in this document is provided in connection with Atmel products. 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