ATR4252C All-in-one IC Solution for Active Antennas DATASHEET Features ● Highly integrated - All-in-one active antenna IC ● Integrated AGC for AM and FM ● Integrated driver for AM and FM pin diodes ● Integrated power supply regulator ● Integrated antenna sensor ● Separated AM LNA, AM buffer and FM amplifier ● High dynamic range for AM and FM ● Excellent noise performance ● High intercept point 3rd order for FM ● FM amplifier adjustable to various cable impedances ● High intercept point 2nd and 3rd order for AM ● Low noise output voltage ● Low power consumption ● Low output impedance AM ● Only small capacitor values necessary at AM AGC ● Large AM frequency range to cover DRM broadcast signals 9264D-AUDR-11/14 1. Description The Atmel® ATR4252C is a highly integrated high performance AM/FM antenna amplification IC with several features. The device has built-in AGC’s for both AM and FM, antenna detection, a power supply regulator as well as additional preintegrated peripherals. The Atmel ATR4252C is based on BICMOS technology. The device is designed in particular for car application and is suitable for active antennas located in several positions on the car such as bumpers, windscreen, mirrors or windows. Figure 1-1. Block Diagram AM LNA IN 23 AM LNA SOURCE 24 AM LNA BIAS REF AMPD GND2 FM BIAS FMB FME FMPD 22 21 20 19 18 17 16 15 FM Amplifier AM LNA 14 FMC 13 FMDET CASCODE 25 FILTER 12 FMTC AM LNA OUT 26 11 VS AMBIAS 27 10 AMOUT AMBUF IN 28 9 GND1 AGC (FM) Voltage Supply Antenna Detect Over Voltage AGC (AM) AM Buffer 1 2 3 4 5 6 7 8 ANTENNA VS VSTART OVDET VREGO AMTC1 AMTC2 AMDET SENSE FILTER 2 ATR4252C [DATASHEET] 9264D–AUDR–11/14 Pin Configuration Table 2-1. AM LNABIAS REF AMPD GND2 FMBIAS FMB FME FMPD Figure 2-1. Pinning VQFN 4x5 / 28L 22 21 20 19 18 17 16 15 AM LNA IN 23 14 FMC AM LNA SOURCE 24 13 FMDET CASCODE FILTER 25 12 FMTC 11 VS AMOUT ATR4252 9 1 2 3 4 5 6 7 8 AMDET 28 AMTC2 AMBUF IN AMTC1 10 VREGO 27 OVDET AMBIAS VSTART 26 VS FILTER AM LNA OUT ANTENNA SENSE 2. GND1 Pin Description Pin Symbol 1 ANTENNA SENSE Function 2 VS FILTER 3 VSTART Comparator input of voltage detector 4 OVDET Overvoltage detection input 5 VREGO Output of voltage regulator 6 AMTC1 AM AGC time-constant capacitance 1 7 AMTC2 AM AGC time-constant capacitance 2 8 AMDET Level detector input of AM-AGC 9 GND1 10 AMOUT 11 VS Antenna sense input Supply voltage filter input Ground AM AM output, impedance matching Supply voltage 12 FMTC 13 FMDET FM AGC time constant Level detector input of FM-AGC 14 FMC Collector of FM amplifier (NPN) 15 FMPD 16 FME FM amplifier emitter (NPN) 17 FMB FM amplifier base (NPN) 18 FMBIAS 19 GND2 Ground FM 20 AMPD AM AGC output for pin diode FM AGC output for pin diode Reference voltage 2.7V FM ATR4252C [DATASHEET] 9264D–AUDR–11/14 3 Table 2-1. Pin Description (Continued) Pin 4 Symbol Function 21 REF 22 AM LNA BIAS 23 AM LNA IN 24 AM LNA SOURCE AM LNA source terminal 25 CASCODE FILTER AM Cascode filter terminal 26 AM LNA OUT 27 AMBIAS 28 AMBUF IN Paddle GND ATR4252C [DATASHEET] 9264D–AUDR–11/14 Reference voltage 6V Reference voltage for AM LNA IN AM LNA input terminal AM LNA output terminal Reference voltage for AMBUF IN AM Buffer amplifier input, impedance matching Ground paddle 3. Functional Description The Atmel® ATR4252C is a highly integrated AM/FM antenna IC with lots of features and functions. In fact the most important feature is the impedance matching on both the antenna input and the cable. The Atmel ATR4252C compensates cable losses between the antenna (for example, windscreen, roof or bumper antennas) and the car radio, which is usually placed far away from the antenna. AM means long wave (LW), medium wave (MW) and short wave (SW) frequency bands (150kHz to 30MHz) that are usually used for AM as well as for DRM transmissions, and FM means any of the world wide used frequency bands for FM radio broadcast (70MHz to 110MHz). Two separate amplifier chains are used for AM and FM due to the different operation frequencies and requirements in the AM and FM band. This allows the use of separate antennas (e.g., windscreen antennas) for AM and FM. Of course, both amplifier chain inputs can also be connected to one antenna (e.g., roof antenna). The AM amplifier chain is separated into two amplifiers. The first one is an LNA that is optimized for low noise figure and low input capacitance. The second amplifier (AM buffer) is optimized to drive a possibly long antenna cable with high parasitic capacitance. Both amplifiers have outstanding large signal performance. All input and output terminals of these two amplifiers are accessible from outside so they can be connected together according to the application needs. Additionally, a filter can be inserted between LNA output and buffer amplifier input. For AM and FM amplifier chain, two separate automatic gain control (AGC) circuits have been integrated in order to avoid overdriving the amplifiers in large signal conditions. The two separate AGC loops prevent strong AM signals from blocking FM stations and vice versa. The integrated PIN diode drivers reduce the external component cost and board space. A voltage regulation stage is integrated in order to further reduce the external component costs. This stage provides overvoltage protection and current limitation. An external transistor is used as power driver for this stage. 3.1 AM Amplifier Due to the long wavelength in AM bands, the antennas used for AM reception in automotive applications are short compared to the wavelength. Therefore, these antennas do not provide 50Ω output impedance, but have an output impedance of some pF. If these (passive) antennas are connected to the car radio by a long cable, the capacitive load of this cable (some 100pF) dramatically reduces the signal level at the tuner input. In order to overcome this problem, Atmel ATR4252C provides two AM amplifiers, one LNA and one AM buffer amplifier. These two amplifiers can be used independently because all input/output terminals and bias inputs are externally accessible for the application. The AM LNA has low input capacitance (12pF typically) to reduce the capacitive load at the antenna and provides a voltage gain of typically 9dB that can be varied from 0 to 15dB depending on external application. The AM buffer amplifier has a very low input capacitance of typically 2.45pF and can also be connected directly to the car antenna if no additional gain is required. Due to the low output impedance of 8Ω, the buffer amplifier is perfectly suited to drive the capacitive load of long antenna cables. The voltage gain of this amplifier is close to 1 (0dB), but the insertion gain that is achieved when the buffer amplifier is inserted between antenna output and antenna cable may be much higher (up to 35dB). The actual value, of course, depends on antenna and cable capacitances. The input of the buffer amplifier is connected by an external 4.7MΩ resistor to the bias voltage in order to maintain high input impedance and low noise voltage. AM tuners in car radios usually use PIN diode attenuators at their input. These PIN diode attenuators attenuate the signal by reducing the input impedance of the tuner. Therefore, a series resistor is used at the AM amplifier output in the standard application. This series resistor guarantees well-defined source impedance for the radio tuner and protects the output of the AM amplifier from short circuit by the PIN diode attenuator in the car radio. ATR4252C [DATASHEET] 9264D–AUDR–11/14 5 3.2 AM AGC The IC is equipped with an AM AGC capability to prevent overdriving of the amplifier in case the amplifier operates near strong signal sources, e.g., transmitters. The AM amplifier output AMOUT is applied to a resistive voltage divider. This divided signal feeds the AGC level detector input pin AMDET. The rectified signal is compared against an internal reference. The threshold of the AGC can be adjusted by modification of the divider ratio of the external voltage divider. If the threshold is reached ,the pin AMPD opens an internal transistor, which controls the pin diode current and limits the antenna signal to prevent an overdriving of the AM amplifier. As the AM AGC has to react very slowly, large capacitors are usually needed for this time delay. To reduce the cost of the external components, a current control for the time delay is integrated, so that only small external capacitor values are needed. The necessary driver for the external pin diode is already incorporated in the Atmel® ATR4252C IC, which reduces the BOM cost and the application size. 3.3 FM Amplifier The FM amplifier is realized with a high performance single NPN transistor. This allows the use of an amplifier configuration, which is optimized for the desired requirements. For low cost application, the common emitter configuration provides good performance at reasonable BOM cost. For high end application, common base configuration with lossless transformer feedback provides high IP3 and low noise figure at reasonable current consumption. In both configurations, gain, input and output impedance can be adjusted by modification of external components. The temperature compensated bias voltage (FMBIAS) for the base of the NPN transistor is derived from an integrated voltage reference. The bias current of the FM amplifier is defined by an external resistor. 3.4 FM AGC The IC is equipped with an AGC capability to prevent overdriving of 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. FM amplifier output FMC is connected to a capacitive voltage divider and the divided signal is applied to the AGC level detector at pin FMDET. This level detector input is optimized for low distortion. The rectified signal is compared against an internal reference. The threshold of the AGC can be adjusted by tuning the divider ratio of the external voltage divider. If the threshold is reached, pin FMPD opens an internal transistor, which controls the pin-diode current. By these means, the amplifier input signal is limited and therefore the FM amplifier is prevented from signal overdrive. The necessary driver for the external pin diode is already incorporated in the Atmel ATR4252C IC, which reduces the BOM cost and the application size. 3.5 Supply Voltage Regulator The driving voltage for an external power transistor is provided by an integrated regulator circuit. An overvoltage protection circuit recognizes overvoltage condition and switches off the amplifier and AGC circuits in order to reduce current consumption and avoid thermal overload. 3.6 Antenna Sensor In addition, an antenna sensor has been integrated in order to recognize if the antenna is properly connected to the amplifier module. If no antenna is detected, the amplifier and AGC circuits are switched off in order to signal this error via reduction of supply current consumption to the unit that provides and monitors the supply current for the antenna amplifier (e.g., the car radio). 6 ATR4252C [DATASHEET] 9264D–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. Reference point is ground. Parameters Pin Symbol Min. Max. Unit Supply voltage 11 VS –0.3 +12 V Antenna sense current 1 ANTENNA SENSE –500 +500 µA Comparator input current 3 VSTART 0 2 mA Overvoltage detector 4 OVDET –0.3 +3.3 V Collector of FM amplifier 14 FMC 3 16 V AM LNA input terminal 23 AM LNA IN 0 2 V AM LNA output terminal 26 AM LNA OUT 7 12 V Power dissipation Ptot 1200 mW Junction temperature Tj 150 °C Ambient temperature Tamb –40 +105 °C Storage temperature Tstg –50 +150 °C VHBM –2 +2 kV Symbol Value Unit RthJA 40 K/W ESD HBM 5. all Thermal Resistance Parameters Junction ambient, soldered on PCB, dependent on PCB layout 6. Operating Range Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Supply voltage Normal operation 11 Vs 7.5 10 11 V Supply voltage No malfunction, performance may be reduced 11 Vs 7 11 V ATR4252C [DATASHEET] 9264D–AUDR–11/14 7 7. Electrical Characteristics See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified No. 1.1 Parameters Supply current 1.2 Reference voltage output 1.3 Output current of reference voltage 1.4 1.5 1.6 Reference voltage output Test Conditions Pin Symbol AGC OFF VS, FMC, AM LNA OUT Is 77 FMAGC ON VS, FMC, AM LNA OUT Is 85 Antenna sense error detected VS, FMC, AM LNA OUT Is Over voltage VS, FMC, AM LNA OUT Is Tamb = –40 to +105°C; FMAGC ON VS, FMC, AM LNA OUT Is FM BIAS VFMBIAS 2.2 FM BIAS IFMBIAS 0 AM BIAS VAMBIAS REF VREF AM LNA BIAS VAMLNABIAS 2.8 AM LNA IN CAMLNAIN 12 AM LNA IN IAMLNAIN AM LNA OUT IAMLNAOUT Includes an Ube-Drift 1kΩ load resistor 2 AM LNA+ Buffer(2) 2.1 Input capacitance 2.2 Input leakage current Tamb = 105°C 2.3 Supply current AMLNA 2.4 Voltage gain f = 1 MHz Input noise voltage Buffer OUT, RBIAS = 4.7MΩ, B = 9kHz, f = 500kHz, 2.5 f = 1MHz 2.8 2.9 Maximum operating frequency OIP3(1) OIP2(1) 3dB corner 15 Antenna Dummy Input AM/FM-OUT Typ. Unit Type* mA B 95 mA B 20 25 mA A 12 14.9 mA A 99 mA C 3.2 V A 3 mA B V A V A V A 2.7 Max. 0.32 Vs 5.7 6 6.3 pF C nA C 18 mA A 9 dB B VN1 –9 dBµV C VN2 –12 dBµV C MHz C 40 AM/FM-OUT f = 1MHz 2.7 Min. 30 AM/FM Out; finp = 1MHz + 1.1MHz, Vout = 110dBµV, 1K II 500pF load, Vs = 10V 144 dBµV C Vs = 7.5V 140 dBµV C AM/FM Out; finp = 1MHz + 1.1MHz, Vout = 110dBµV, 1K II 500pF load, Vs = 10V 170 dBµV C Vs = 7.5V 157 dBµV C *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 8 1. AGC loop deactivated (PIN diode removed) 2. Measured with antenna dummy (see Figure 8-3 on page 14). 3. Current defined by R17 = 56Ω ATR4252C [DATASHEET] 9264D–AUDR–11/14 7. Electrical Characteristics (Continued) See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified No. 3 Parameters Test Conditions 3.1 Input capacitance 3.2 Input leakage current Tamb = 85°C 3.3 Output resistance 3.4 Voltage gain 3.5 AMOUT, RBIA S = 4.7MΩ, B = 9kHz, Output noise voltage 150kHz 200kHz 500kHz 1MHz 3.6 3.7 3.8 4 Pin Symbol Min. Typ. Max. Unit Type* AM BUF IN CAMIN 2.2 2.45 2.7 pF C 40 nA C Ω C AM Buffer Amplifier (2) OIP3(1) OIP2(1) Maximum operating frequency f = 1MHz AM BUF IN AM OUT ROUT f = 1MHz AM OUT 6 8 10 0.85 0.90 0.96 –8 –9 –11 –12 –6 –7 –9 –10 VNOISE A dBµV dBµV dBµV dBµV C AM/FM Out; finp = 1MHz + 1.1MHz, Vout = 110dBµV, 1K II 500pF load, Vs = 10V 145 dBµV C Vs = 7.5V 142 dBµV C AM/FM Out; finp = 1MHz + 1.1MHz, Vout = 110dBµV, 1K II 500pF load, Vs = 10V 173 dBµV C Vs = 7.5V 162 dBµV C MHz C 0.5dB corner AM OUT 30 AM AGC 4.1 Input resistance AM DET RAMDET 40 50 kΩ A 4.2 Input capacitance f = 1MHz AM DET CAMDET 2.6 3.2 3.8 pF C 4.3 AGC input voltage threshold f = 1MHz AM DET VAMth 86 89 92 dBµV B 4.4 3dB corner frequency AGC threshold increased by 3dB AM PD MHz C 4.5 Saturation voltage 10mA AM PD V B 4.6 Leakage current AM PD µA B 4.7 Maximum PIN Diode AGC active current AM PD mA A 4.8 Maximum AGC sink current AM PD IAMsink µA A 4.9 Transconductance of diamtc1 / duamdet level detector am det, am tc1 diamtc / duamdet 60 µA---------V rms B 4.10 IP3 at level detector input AM DET 170 dBµV C V(AMTC1) = 2V Rfoff 1MHz + 1.1MHz, 120dBµV 30 VS – 1.9 4 22 35 –2.0 –1.7 150 –1.4 *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. AGC loop deactivated (PIN diode removed) 2. Measured with antenna dummy (see Figure 8-3 on page 14). 3. Current defined by R17 = 56Ω ATR4252C [DATASHEET] 9264D–AUDR–11/14 9 7. Electrical Characteristics (Continued) See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified No. 5 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* 1.95 2.3 V A 2.3 V C FM Amplifier (see Figure 8-1 on page 12) 5.1 Emitter voltage T = 25°C FME 1.85 5.2 Emitter voltage T = –40°C to +105°C FME 1.7 5.3 Supply current Common base FMC IFMC 29 mA B 5.4 Supply current (3) Common emitter FMC IFMC 35 mA A 5.5 Maximum output voltage Vs = 10V FMC Vpp C 5.6 Input resistance f = 100MHz FM IN Ω C 5.7 Maximum operating frequency 3dB corner, common emitter FM OUT MHz C 5.8 Output resistance f = 100MHz FM OUT Power gain f = 100MHz, common base circuit (see Figure 8-2 on page 13) 5.9 12 RFMIN 50 450 RFMOUT 50 Ω C G 5.2 dB C 145 dBµV C 1.9 dB C 13.5 dB B 5.10 OIP3 at FMOUT Common base circuit 5.11 NF Common base circuit 5.12 Power gain f = 100MHz, common emitter circuit (see Figure 8-1 on page 12) 5.13 OIP3 at FMOUT Common emitter circuit FM OUT 140 dBµV B 5.14 NF Common emitter circuit FM OUT 3.5 dB C FM DET dBµV dBµV B C V B µA B mA A 6 FM OUT G FM AGC 6.1 AGC input voltage threshold FM range: f = 100MHz Extended: f = 900MHz 6.2 Saturation voltage 10mA 6.3 Leakage current FMPD 6.4 Maximum PIN Diode AGC active current FMPD 6.5 Input resistance 6.6 Input capacitance 6.7 6.8 6.9 Vth1,100 Vthl,900 83 81 FMPD 85 85 87 89 VS – 1.9 1 12 14 FM DET RFMDET 17 21 25 kΩ C f = 100MHz FM DET CFMDET 1.5 1.75 2.0 pF C IP3 Pin 13 FM 100MHz + 105MHz, VFMDET = 120dBµV FM DET dBµV C Current Pin FMTC RFoff –7.2 µA C 0.8 mA/V (rms) B Transconductance dIFMTC / dUFMDET 150 FMTC IFMTC FMTC FM DET dIFMTC / dUFMDET –13 0.35 –9 0.5 *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 10 1. AGC loop deactivated (PIN diode removed) 2. Measured with antenna dummy (see Figure 8-3 on page 14). 3. Current defined by R17 = 56Ω ATR4252C [DATASHEET] 9264D–AUDR–11/14 7. Electrical Characteristics (Continued) See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified No. 7 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* VS 9.5 10 10.5 V A VB, AM/FM-Out 40 50 dB C 1.6 V A % C V C Voltage Regulator / Monitor 7.1 Output voltage of regulator Battery voltage VB = 14V 7.2 Ripple rejection of regulator 100Hz, VB > VS + 1V 7.3 Threshold for overvoltage detection OVDET 7.4 Hysteresis of over voltage detection OVDET 8 Antenna Sensor 8.1 Antenna monitor range Rsense = 22kΩ, antenna detected ANT SENS 1.8 4 0 to 3 6 to 16 *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. AGC loop deactivated (PIN diode removed) 2. Measured with antenna dummy (see Figure 8-3 on page 14). 3. Current defined by R17 = 56Ω ATR4252C [DATASHEET] 9264D–AUDR–11/14 11 8. Test Circuits Figure 8-1. Common Emitter Configuration AMIN L5 3.3µH C20 220nF C23 2.2nF +VS R25 39kΩ C30 220nF R24 0Ω R13 15Ω C18 C16 100nF 2.2nF R20 1.8kΩ C22 220nF R19 L2 C21 220nF 4.7MΩ R21 180Ω R14 10kΩ C25 220Ω 22 21 20 18 19 17 16 15 13 C19 R10 1.2pF 100Ω 100nF 26 11 27 10 28 9 1 R23 0Ω 2 3 C31 1nF 4 5 6 8 R2 slug C8 C9 33pF R9 L3 33Ω 470nH R8 3.3kΩ 2.7kΩ 2 1 Jumper2 J1 0Ω GND ATR4252C [DATASHEET] R7 560Ω R3 R5 R26 C29 22kΩ 10Ω 220nF R28 VB 10nF C7 100nF C6 4.7µF C2 18kΩ 22kΩ C26 9264D–AUDR–11/14 7 R6 T1 2SB1122 +VS 4.7Ω + C1 10µF C11 100nF 2.2nF AM/FM_OUT L1 120nH C10 FMIN 2.2nF R4 R1 220nF C4 560Ω 470 nF R27 4.7MΩ R18 470Ω 12 C12 12 ATR4252 R11 2.2pF 14 27 kW C28 2.2nF R12 10kΩ D1 C14 C13 25 220nF C27 R15 C5 2.2nF 24 220nF 56Ω 1SV262 R22 0Ω 220nF D52FU 2.2mH R16 C15 10nF 1kΩ 23 L4 R17 560nH BA779-2 C24 470pF Figure 8-2. Common Base Configuration AMIN L5 3.3µH BA779-2 C24 C20 470pF 220nF C23 2.2nF +VS R25 39kΩ C15 L2 R17 120nH 68Ω R15 120nH L7 C18 3 1 4 6 1nF C30 220nF R21 180Ω R22 0Ω 21 20 18 19 17 16 15 220Ω nc 220nF C27 26 11 27 10 28 9 1 R23 0Ω 2 3 4 5 C19 R10 1.2pF 100Ω L1 120nH 100nF 6 7 C31 C14 R11 1pF 1kΩ D1 C5B 2.2nF C4 6 8 slug 1SV264 C3 2.2nF 4 C9A 27pF 3 C9B 15pF T2 1 1 nF C9C nc L8 nc FMIN 2.2nF C9D nc L9 nc C9E AM/FM_OUT nc L10 nc R9 R9 33Ω C10 470nF L3 470nH R8 3.3kΩ R4 R1 22kΩ C26 220nF R2 C2 C8 C6 2 1 Jumper2 J1 22kΩ R28 0Ω GND R7 560Ω R3 R5 VB 10nF C7 4.7µF R18 470Ω 100nF R27 4.7MΩ C12 12 ATR4252 2.7kΩ C28 2.2nF 25 18kΩ R29 220nF 13 27kΩ C25 24 R24 10Ω 2.2pF 14 220nF L4 2.2mH 23 R16 C5A 2.2nF T3 C13 22 R12 10kΩ 10nF 1kΩ C21 220nF 4.7MΩ nc C32 100nF 220nF R19 C16 L6 nc R20 1.8kΩ C22 C17 22pF R13 nc R14 10kΩ R26 10Ω C29 + 220nF R6 T1 2SB1122 +VS 4.7W + C1 10µF C11 100nF ATR4252C [DATASHEET] 9264D–AUDR–11/14 13 Figure 8-3. Antenna Dummy for Test Purposes Antenna Dummy Input Capacitor (Representing Antenna Capacitance) Connect directly to Amplifier (no Cable!) 56pF 50Ω Signal Source Termination (50Ω) Coaxial Connector Figure 8-4. Recommended Footprint 0.5 1.0 0.3 2.7 4.4 14 ATR4252C [DATASHEET] 9264D–AUDR–11/14 5.4 3.7 PIN 1 9. Internal Cicuitry Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown) Pin Symbol 1 ANTENNA SENSE 2, 13 VSFILTER; FMDET Function 1 2, 13 3 3 VSTART 4 OVDET 4 5 5 VREGO 6, 12 AMTC1; FMTC 6, 12 ATR4252C [DATASHEET] 9264D–AUDR–11/14 15 Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown) (Continued) Pin Symbol 7 AMTC2 Function 7 8 8 AMDET 9, 19 GND1, GND2 10 AMOUT 11 VS 9, 19 10 11 VS 14, 26 14, 26 FMC, AMLNAOUT 15, 20 FMPD, AMPD 15, 20 16 ATR4252C [DATASHEET] 9264D–AUDR–11/14 Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown) (Continued) Pin Symbol 16, 18 FME, FMBIAS Function 16, 18 17 FMB 21 REF 17 21 22, 27 AMLNABIAS; AMBIAS 23, 24, 28 AMLNAIN, AMLNASOURCE, AMBUFIN 25 CASCODEFILTER 22, 27 23, 24, 28 25 ATR4252C [DATASHEET] 9264D–AUDR–11/14 17 10. Ordering Information Extended Type Number Package Remarks MOQ ATR4252C-RAQW-1 VQFN 4x5 / 28L Taped and reeled 6000 pieces 11. Package Information Top View D 28 1 PIN 1 ID E technical drawings according to DIN specifications 8 A Side View A3 A1 Dimensions in mm Bottom View D2 9 14 15 8 COMMON DIMENSIONS E2 (Unit of Measure = mm) 1 28 23 e Z 10:1 L Z 22 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 3.9 4 4.1 D2 2.5 2.6 2.7 E 4.9 5 5.1 E2 3.5 3.6 3.7 L 0.35 0.4 0.45 b e 0.2 0.25 0.5 0.3 NOTE b 10/18/13 TITLE Package Drawing Contact: firstname.lastname@example.org 18 ATR4252C [DATASHEET] 9264D–AUDR–11/14 Package: VQFN_4x5_28L Exposed pad 2.6x3.6 GPC DRAWING NO. REV. 6.543-5143.02-4 1 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. History 9264D-AUDR-11/14 • Section 10 “Ordering Information” on page 18 updated 9264C-AUDR-08/14 • Section 11 “Package Information” on page 18 updated 9264B-AUDR-01/14 • Section 11 “Package Information” on page 18 updated ATR4252C [DATASHEET] 9264D–AUDR–11/14 19 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.: 9264D–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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