ATR4251C Low-noise, High-dynamic-range AM/FM Antenna Amplifier IC DATASHEET Features ● High dynamic range for AM and FM ● Integrated AGC for AM and FM ● 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 9258E-AUDR-11/14 1. Description The Atmel® ATR4251C is an integrated low-noise AM/FM antenna amplifier with integrated AGC in BiCMOS2S technology. The device is designed in particular for car applications, and is suitable for windshield and roof antennas. Figure 1-1. Block Diagram QFN24 Package VREF1 FM IN FM FM GAIN GND2 OUT AGC IN Paddle = GND 24 NC* GND AGC1 AGC2 VREF2 AMIN 23 22 21 20 19 FM amplifier 1 18 BAND GAP 2 17 AGC 3 16 4 5 15 14 AM AGC (AM) 6 7 8 9 13 10 11 NC* VS AGCCONST VREF4 AMOUT1 GND1 12 T NC* NC* CREG AGC AGC AMIN AM CONST * Pin must not be connected to any other pin or supply chain except GND. Figure 1-2. Block Diagram SSO20 Package FMGAIN 20 GND2 1 FMIN 2 VREF1 3 GND 4 AGC1 5 AGC2 6 VREF2 7 AMIN1 8 CREG 9 FM amplifier 18 AGCIN AGC 15 VREF4 14 AMOUT1 AM AGC (AM) 9258E–AUDR–11/14 13 GND1 12 TCONST 11 AGCAM SSO20 ATR4251C [DATASHEET] 17 VS 16 AGCCONST Band gap AGCAMIN 10 2 19 FMOUT Pin Configuration VREF1 FMIN FMGAIN GND2 FMOUT AGCIN Figure 2-1. Pinning QFN24 NC GND AGC1 AGC2 VREF2 AMIN 1 24 23 22 21 20 19 18 2 17 3 16 4 15 5 14 6 7 8 13 9 10 11 12 NC VS AGCCONST VREF4 AMOUT1 GND1 NC CREG AGCAMIN AGCAM TCONST NC 2. Table 2-1. Pin Description QFN24 Pin Symbol 1 NC Function 2 GND Ground FM 3 AGC1 AGC output for pin diode 4 AGC2 AGC output for pin diode 5 VREF2 Reference voltage for pin diode 6 AMIN AM input, impedance matching 7 NC Pin must not be connected to any other pin or supply chain except GND. Pin must not be connected to any other pin or supply chain except GND 8 CREG 9 AGCAMIN AM - AGC time constant capacitance 2 10 AGCAM AM - AGC output for pin diode 11 TCONST AM - AGC - time constant capacitance 1 AM - AGC input 12 NC 13 GND1 Pin must not be connected to any other pin or supply chain except GND 14 AMOUT1 15 VREF4 16 AGCCONST 17 VS Supply voltage 18 NC Pin must not be connected to any other pin or supply chain except GND 19 AGCIN FM AGC input 20 FMOUT FM output 21 GND2 22 FMGAIN 23 FMIN 24 VREF1 Paddle GND Ground AM AM output, impedance matching Bandgap FM AGC time constant Ground FM gain adjustment FM input Reference voltage 2.7V Ground paddle ATR4251C [DATASHEET] 9258E–AUDR–11/14 3 Figure 2-2. Pinning SSO20 FMGAIN FMIN VREF1 GND AGC1 AGC2 VREF2 AMIN1 CREG AGCAMIN Table 2-2. 4 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 Pin Description SSO20 Pin Symbol Function 1 FMGAIN FM gain adjustment 2 FMIN 3 VREF1 4 GND FM ground 5 AGC1 AGC output for PIN diode 6 AGC2 AGC output for PIN diode 7 VREF2 Reference voltage for PIN diode 8 AMIN1 AM input, impedance matching 9 CREG AM AGC constant capacitance 2 10 AGCAMIN 11 AGCAM AM AGC output for PIN diode 12 TCONST AM AGC constant capacitance 1 13 GND1 14 AMOUT1 15 VREF4 16 AGCCONST 17 VS Supply voltage 18 AGCIN FM AGC input 19 FMOUT FM output 20 GND2 FM ground ATR4251C [DATASHEET] 9258E–AUDR–11/14 FM input Reference voltage 2.7V AM input, AM AGC AM ground AM output, impedance matching Band gap 6V FM AGC constant GND2 FMOUT AGCIN VS AGCCONST VREF4 AMOUT1 GND1 TCONST AGCAM 3. Functional Description The Atmel® ATR4251C is an integrated AM/FM antenna impedance matching circuit. It compensates cable losses between the antenna (for example windshield, roof, or bumper antennas) and the car radio which is usually placed far away from the antenna. AM refers to the long wave (LW), medium wave (MW) and short wave (SW) frequency bands (150kHz to 30MHz) that are usually used for AM transmission, and FM means any of the frequency bands used world-wide for FM radio broadcast (70MHz to 110MHz). Two separate amplifiers are used for AM and FM due to the different operating frequencies and requirements in the AM and FM band. This allows the use of separate antennas (for example, windshield antennas) for AM and FM. Of course, both amplifiers can also be connected to one antenna (for example, the roof antenna). Both amplifiers have automatic gain control (AGC) circuits in order to avoid overdriving the amplifiers under large-signal conditions. The two separate AGC circuits prevent strong AM signals from blocking FM stations, and vice versa. 3.1 AM Amplifier Due to the long wavelength in AM bands, the antennas used for AM reception in automotive applications must be 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 ATR4251C provides an AM buffer amplifier with low input capacitance (less than 2.5pF) and low output impedance (5Ω). The low input capacitance of the amplifier reduces the capacitive load at the antenna, and the low impedance output driver is able to drive the capacitive load of the cable. The voltage gain of the amplifier is close to 1 (0dB), but the insertion gain that is achieved when the buffer amplifier is inserted between antenna output and cable may be much higher (35dB). The actual value depends, of course, on antenna and cable impedance. The input of the amplifier is connected by an external 4.7MΩ resistor to the bias voltage (pin 7, SSO20) in order to achieve 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 a 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. 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 antenna signal level, for example, transmitters. The AM amplifier output AMOUT1 is applied to a resistive voltage divider. This divided signal is applied to the AGC level detector input pin AGCAMIN. The rectified signal is compared against an internal reference. The threshold of the AGC can be adjusted by adjusting the divider ratio of the external voltage divider. If the threshold is reached, pin AGCAM opens an external transistor which controls PIN diode currents and limits the antenna signal and thereby prevents overdriving the AM amplifier IC. 3.3 FM Amplifier The FM amplifier is realized with a single NPN transistor. This allows use of an amplifier configuration optimized on the requirements. For low-cost applications, the common emitter configuration provides good performance at reasonable bills of materials (BOM) cost(1). For high-end applications, common base configuration with lossless transformer feedback provides a high IP3 and a low noise figure at reasonable current consumption(2). In both configurations, gain, input, and output impedance can be adjusted by modification of external components. The temperature compensated bias voltage (VREF1) for the base of the NPN transistor is derived from an integrated band gap reference. The bias current of the FM amplifier is defined by an external resistor. Notes: 1. See test circuit (Figure 8-1 on page 11) 2. See application circuit (Figure 9-1 on page 12) ATR4251C [DATASHEET] 9258E–AUDR–11/14 5 3.4 FM/TV AGC The IC is equipped with an AGC capability to prevent overdriving the amplifier in cases when the amplifier is operated with strong antenna signals (for example, near transmitters). It is possible to realize an external TV antenna amplifier with integrated AGC and external RF transistor. The bandwidth of the integrated AGC circuit is 900MHz. FM amplifier output FMOUT is connected to a capacitive voltage divider and the divided signal is applied to the AGC level detector at pin AGCIN. 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 adjusting the divider ratio of the external voltage divider. If the threshold is reached, pin AGC1 opens an external transistor which controls the PIN diode current, this limits the amplifier input signal level and prevents overdriving the FM amplifier. 6 ATR4251C [DATASHEET] 9258E–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 (pins 4 and 13 for SSO20 and pins 2, 13, 21 and Paddle for QFN24 package). Parameters Symbol Value Unit Supply voltage VS 12 V Power dissipation, Ptot at Tamb = 90°C Ptot 550 mW Tj 150 °C Ambient temperature SSO20 package Tamb –40 to +90 °C Ambient temperature QFN24 package Tamb –40 to +105 °C Storage temperature Tstg –50 to +150 °C Pins 1 to 19, 21 and 24 ±2000 V Pins 20, 22 and 23 ±1500 V Junction temperature ESD HMB QFN24 Pins 2 to 18 ±2000 V Pins 1, 19 and 20 ±1500 V All pins ±200 V Symbol Value Unit Junction ambient, soldered on PCB, dependent on PCB Layout for SSO 20 package RthJA 92 K/W Junction ambient, soldered on PCB, dependent on PCB Layout for QFN package RthJA 40 K/W ESD HMB SSO20 ESD MM 5. Thermal Resistance Parameters 6. Operating Range Parameters Symbol Min. Typ. Max. Unit VS 8 10 11 V Ambient temperature SSO20 package Tamb –40 +90 °C Ambient temperature QFN 24 package Tamb –40 +105 °C Supply voltage ATR4251C [DATASHEET] 9258E–AUDR–11/14 7 7. Electrical Characteristics See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN package. No. Parameters 1.1 Supply currents 1.2 Reference voltage 1 output 1.3 Reference voltage 2 output 1.4 Reference voltage 4 output 2 Test Conditions Ivref1 = 1mA Ivref4 = 3mA Pin Symbol Min. Typ. Max. Unit Type* 17 (17) IS 11 14 17 mA A 3 (24) VRef1 2.65 2.8 2.95 V A 7 (5) VRef2 0.38VS 0.4VS 0.42VS V B 15 (15) VRef4 6.0 6.35 6.7 V A 2.7 pF D 40 nA C Ω D AM Impedance Matching 150kHz to 30MHz (The Frequency Response from Pin 8 to Pin 14) 2.1 Input capacitance f = 1MHz 8 (6) 2.2 Input leakage current Tamb = 85°C 8 (6) 2.3 Output resistance 14 (14) ROUT 4 5 8 Voltage gain f = 1MHz 8/14 (6/14) A 0.94 0.97 1 2.5 Output noise voltage (rms value) Pin 14 (14), R78 = 4.7MΩ, B = 9kHz, CANT = 30pF 150kHz 200kHz 500kHz 1MHz –8 –9 –11 –12 –6 –7 –9 –10 dBµV dBµV dBµV dBµV 2.6 2nd harmonic Vs = 10V, 50Ω load, fAMIN = 1MHz, input voltage = 120dBµV AMOUT1 –60 –58 dBc C 2.7 3rd harmonic Vs = 10V, 50Ω load, fAMIN = 1MHz, input voltage = 120dBµV AMOUT1 –53 –50 dBc C 2.4 3 14 CAMIN 2.2 VN1 VN2 VN3 VN4 2.45 A AM AGC 3.1 Input resistance 10 (9) RAGCAMIN 40 50 kΩ D 3.2 Input capacitance f = 1MHz 10 (9) CAGCAMIN 2.6 3.2 3.8 pF D 3.3 AGC input voltage threshold f = 1MHz 10 (9) VAMth 75 77 79 dBµV B 3.4 3 dB corner frequency AGC threshold increased by 3dB MHz D 3.5 Minimal AGCAM output voltage ViHF = 90dBµV at pin 10 (9) 10/11 (9/10) VAGC VS – 2.4 VS – 2.1 VS – 1.7 V A 3.6 Maximal AGCAM output voltage ViHF = 0V at pin 10 (9) 10/11 (9/10) VAGC VS – 0.2 VS – 0.1 V A 3.7 Maximal AGCAM output voltage(1) ViHF = 0V at pin 10 (9) T = +85°C 10/11 (9/10) VAGC VS – 0.4 VS – 0.3 V C 3.8 Maximum AGC sink current ViHF = 0V at pin 10 (9) U (pin 12 (11)) = 2V 12 (11) IAMsink µA A 10 –150 –120 –90 *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS 2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”) 3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”) 8 C ATR4251C [DATASHEET] 9258E–AUDR–11/14 7. Electrical Characteristics (Continued) See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN package. No. Parameters Test Conditions Pin Symbol I AM sin k ------------------V AMth 3.9 Transconductance of Level detector ViHF = VAMth at pin 10 (9) 10/12 (9/11) 3.10 IP3 at level detector input Figure 9-2 on page 13, 1MHz and 1.1MHz, 120dBµV 10 (9) 3.11 PIN diode current generation d(20 log IPin-diode) / dUPin12 T = 25°C, UPin12 = 2V 3.12 Output resistance 4 9 (8) Min. 150 ROUT Typ. Max. Unit Type* 20 µA --------------mV rms C 170 dBµV D 30 dB/V D 27 35 45 kΩ D 1 (22) 1.85 1.95 2.05 V A 1.8 2.0 2.2 V C 37 mA D Vpp D FM Amplifier 4.1 Emitter voltage 4.2 Emitter voltage T = –40°C to +85°C 1 (22) 4.3 Supply current limit Rε = 56Ω 19 (20) 4.4 Maximum output voltage VS = 10V 19 (20) 4.5 Input resistance f = 100MHz 2 (23) RFMIN 50 Ω D 4.6 Output resistance f = 100MHz 19 (20) RFMOUT 50 Ω D FMOUT/ FMIN G 5 dB A 19 (20) VN –5.1 dBµV D 19 (20) IIP3 140 dBµV C 6 dB C 2.8 dB C 148 dBµV C 4.7 Power gain(2) f = 100MHz 4.8 Output noise voltage (emitter circuit)(2) f = 100MHz, B = 120kHz 4.9 OIP3 (emitter circuit)(2) f = 98 + 99MHz I19 12 (3) 4.10 Gain 4.11 Noise figure (3) (3) 4.12 OIP3 f = 98 + 99MHz Parameters Dependent of External Components in Application Circuit: RFMIN, RFMOUT, G, VN, IIP3 5 FM AGC 5.1 AGC threshold f = 100MHz f = 900MHz 18 (19) Vth1,100 Vthl,900 81 81 83 85 85 87 dBµV dBµV B B 5.2 AGC1 output voltage AGC1 active, Vpin16 (16) = 5V 5 (24) VAGC VS – 2.1V VS – 1.9V VS – 1.7V V C 5.3 AGC1 output voltage AGC1 inactive, Vpin16 (16) = 1.7V 5 (24) VAGC VS – 0.2V VS V C 5.4 AGC2 output voltage AGC2 active, Vpin16 (16) = 1.7V 6 (4) VAGC VS – 2.1V VS – 1.9V V C 5.5 AGC2 output voltage AGC2 inactive, Vpin16 (16) = 5V 6 (4) VAGC VS – 0.2V VS V C 5.6 Input resistance 18 (19) RPin18 17 21 25 kΩ D 5.7 Input capacitance 18 (19) CPin18 1.5 1.75 1.9 pF D F = 100MHz VS – 1.7V *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS 2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”) 3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”) ATR4251C [DATASHEET] 9258E–AUDR–11/14 9 7. Electrical Characteristics (Continued) See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN package. No. Parameters Test Conditions 5.8 IP3 at AGC input Figure 9-2 on page 13, 100MHz and 105MHz, VGen = 120dBµV 18 (19) 5.9 IP3 at AGC input 900MHz and 920MHz VGen = 120dBµV 18 (19) 5.10 Max. AGC sink current ViHF = 0V 5.11 Transconductance ViHF = Vth1,100, dIPin16(16) / dUPin18(19) 5.12 Gain AGC1, AGC2 UPin16 = 3V, dUPin5(3) / dUPin16(16), –dUPin6(4) / dUPin16(16) Pin 16 Symbol Min. Typ. Max. Unit Type* 150 dBµV D 148 dBµV D IPin16 –11 –9 –7 µA C dIPin16 / dUPin18 0.8 1.0 1.3 mA/V (rms) C 0.5 0.56 0.6 *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS 2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”) 3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”) 10 ATR4251C [DATASHEET] 9258E–AUDR–11/14 C Test Circuit FM/AM Figure 8-1. Common Emitter Configuration + 10µF 470nF AMOUT1 5kΩ 1nF AGCAM 22Ω + + 56Ω 2.2nF AGCAMIN 68Ω 4.7MΩ 1µH SSO20 11 10 9 CREG 8 AMIN1 7 VREF2 6 4 GND VREF1 3 Band gap AGC (AM) AM 12 13 GND1 TCONST 47Ω1) + AMOUT1 + AGC FM amplifier FMIN 1 270Ω 2 2.2nF 17 VS AGCIN 18 19 20 GND2 FMOUT FMOUT 22pF 2.2µF 14 4.7µF VREF4 22pF 15 150nH AGC2 100nF AGCCONST 10µF GND 500pF AGCIN + 16 4.7Ω 100nF 5 4.7Ω AGC1 VS FMGAIN 8. 1µF 10µF 33pF 2.2nF 15nF Cant 2.2nF FMIN 220nF AMINP1 50Ω 50Ω AMAGCIN (1) Output impedance 50Ω adjustment ATR4251C [DATASHEET] 9258E–AUDR–11/14 11 9. Application Circuit (Demo Board) Figure 9-1. Common Base Configuration AM/FM_OUT +VS +VS R23 100nF 180nH R24 4.7Ω + C27 10µF GND R11(2) 10kΩ 2.2µF C17 L3 C24 C21 100nF 470nF C31 33pF 100nF R20 R21 100Ω T2 BC858 33Ω(1) 2.2pF (4) L3 470nH C19 C12 100nF C20 AM/FM application combined with AM AGC with the following capability 4.7µF TCONST AM 12 R12(2) 2.2kΩ AGC (AM) 13 GND1 AMOUT1 14 VREF4 15 AGCCONST 16 VS Band gap 1pF + 220nF AGC FM amplifier 1kΩ 17 AGCIN 18 19 20 GND2 FMOUT 1pF(4) 2. Testing AM + AM AGC connector AM as input connector AM/FM_OUT as output C28 C33 C13 1nF C18 1. Testing FM + FM AGC connector FM as input connector AM/FM_OUT as output R3 R10 100Ω SSO20 10µF C30 C23 AGCAM 4.7Ω + C26 11 VB+ 10 D3 BA779-2 D1 D2 BA679 BA679 R1 47Ω R2 51Ω 100nF C1 R7 FM 10 9 CREG 8 R25 68Ω R4 4.7MΩ C3 C5 2.2nF AMIN1 7 VREF2 6 AGC2 5 4 +VS AGCAMIN 2.2nF AGC1 C2 GND FMGAIN TR1 3 3 VREF1 1 2 4 2.2nF FMIN 6 1 C29 2.2pF L1 120nH (2) C4 22pF R6 R5 100Ω (2) 10nF AM C32 10µF 1µF C10 RS1 2Ω 220nF 15nF R9 C8 T1 10kΩ(3) BC858 C6 + C7 1nF R8 3kΩ(3) C11 100pF (1) AM Output impedance (50Ω adjustment) (2) Leakage current reduction (3) AM AGC threshold (4) AM AGC threshold 12 ATR4251C [DATASHEET] 9258E–AUDR–11/14 Figure 9-2. Antenna Dummy for Test Purposes OUTPUT 50Ω 1nF 50Ω Gen AGCIN ATR4251C [DATASHEET] 9258E–AUDR–11/14 13 10. Internal Circuitry Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) PIN SSO20 PIN QFN24 Symbol Equivalent Circuit 19 1 2 19 22 23 20 FMGAIN FMIN FMOUT 1 2 3 24 VREF1 3 4, 13, 20 2, 13, 21 GND VS 5 6 7 14 3 4 AGC1 AGC2 1, 7, 12, 18 NC 5 VREF2 ATR4251C [DATASHEET] 9258E–AUDR–11/14 5 7 Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued) PIN SSO20 PIN QFN24 Symbol Equivalent Circuit VS 8 6 AMIN1 8 9 8 CREG 9 10 10 9 AGCAMIN 11 10 AGCAM 11 ATR4251C [DATASHEET] 9258E–AUDR–11/14 15 Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued) PIN SSO20 PIN QFN24 Symbol 12 11 TCONS Equivalent Circuit 12 14 14 AMOUT1 15 15 VREF4 16 16 AGCCONST 17 17 VS 14 15 16 ATR4251C [DATASHEET] 9258E–AUDR–11/14 16 Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued) PIN SSO20 PIN QFN24 Symbol 18 19 AGCIN Equivalent Circuit 18 ATR4251C [DATASHEET] 9258E–AUDR–11/14 17 11. Ordering Information Extended Type Number Package Remarks MOQ ATR4251C-TKQW SSO20 Taped and reeled 4000 pieces ATR4251C-PFQW QFN24, 4mm × 4mm Taped and reeled 6000 pieces 12. Package Information Figure 12-1. SSO20 E1 A L C b A2 A1 D E e 20 11 technical drawings according to DIN specifications Dimensions in mm 1 10 COMMON DIMENSIONS (Unit of Measure = mm) Symbol MIN NOM MAX A 0.9 1.0 1.1 A1 A2 0.05 0.85 0.1 0.9 0.15 0.95 D 6.4 6.5 6.6 E 6.3 6.4 6.5 E1 4.3 4.4 4.5 L 0.5 0.6 0.7 C 0.1 0.15 0.2 b e 0.2 0.25 0.65 BSC 0.3 NOTE 04/16/14 TITLE Package Drawing Contact: [email protected] 18 ATR4251C [DATASHEET] 9258E–AUDR–11/14 Package: SSO20 4.4mm GPC DRAWING NO. REV. 6.543-5182.01-4 1 Figure 12-2. VQFN 4x4 24L Top View D 24 1 technical drawings according to DIN specifications E PIN 1 ID 6 A Side View A3 A1 Dimensions in mm Bottom View D2 12 7 13 E2 6 1 COMMON DIMENSIONS (Unit of Measure = mm) 18 24 Z 19 e L Z 10:1 b 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 3.9 4 4.1 E2 2.5 2.6 2.7 L 0.35 0.4 0.45 b e 0.2 0.25 0.5 0.3 NOTE 05/19/14 TITLE Package Drawing Contact: [email protected] Package: QFN_4x4_24L Exposed pad 2.6x2.6 GPC DRAWING NO. REV. 6.543-5202.01-4 1 ATR4251C [DATASHEET] 9258E–AUDR–11/14 19 13. 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. 9258E-AUDR-11/14 9258D-AUDR-08/14 History • Section 11 “Ordering Information” on page 18 updated • Section 12 “Package Information” on pages 18 to 19 updated • Put datasheet in the latest template • Section 7 “Electrical Characteristics” number 1.1 min. values on page 8 updated 20 9258C-AUDR-01/14 • Section 7 “Electrical Characteristics” numbers 1.2, 1.4, 2.4 min., typ. and max.values on page 8 updated 9258B-AUDR-07/13 • Section 4 “Absolute Maximum Ratings” on page 7 updated ATR4251C [DATASHEET] 9258E–AUDR–11/14 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.: 9258E–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. 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