ATR4251-PFQY

Manufacturer Part NumberATR4251-PFQY
DescriptionIC AMP AM/FM ANT HI RANGE 24-QFN
ManufacturerAtmel
ATR4251-PFQY datasheet
 


Specifications of ATR4251-PFQY

Current - Supply11mA ~ 17mAFrequencyAM, FM
Gain6dBNoise Figure2.8dB
Package / Case24-VQFN Exposed Pad, 24-HVQFN, 24-SQFN, 24-DHVQFNRf TypeBroadcast Radio
Voltage - Supply8 V ~ 11 VLead Free Status / RoHS StatusLead free / RoHS Compliant
P1db-Test Frequency-
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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
1. Description
The ATR4251 is an integrated low-noise AM/FM antenna amplifier with integrated
AGC in BiCMOS2S technology. The device is designed in particular for car applica-
tions, and is suitable for windshield and roof antennas.
Figure 1-1.
Block Diagram QFN24 Package
FM
VREF1
IN
24
23
NC*
1
GND
BAND
2
GAP
AGC1
3
AGC2
4
VREF2
5
AM
AMIN
6
7
8
CREG
NC*
* Pin must not be connected to any other pin or supply chain except GND.
FM
FM
AGC
GAIN
GND2
OUT
IN
Paddle = GND
22
21
20
19
FM
NC*
amplifier
18
VS
17
AGC
AGCCONST
16
VREF4
15
AMOUT1
14
AGC
GND1
(AM)
13
9
10
11
12
AGC
AGC
T
NC*
AMIN
AM
CONST
Low-noise,
High-dynamic-
range AM/FM
Antenna
Amplifier IC
ATR4251
4913J–AUDR–10/09

ATR4251-PFQY Summary of contents

  • Page 1

    ... Low Power Consumption • Low Output Impedance AM 1. Description The ATR4251 is an integrated low-noise AM/FM antenna amplifier with integrated AGC in BiCMOS2S technology. The device is designed in particular for car applica- tions, and is suitable for windshield and roof antennas. Figure 1-1. Block Diagram QFN24 Package ...

  • Page 2

    ... Figure 1-2. Block Diagram SSO20 Package FMGAIN AGCAMIN ATR4251 amplifier FMIN 2 VREF1 3 AGC GND 4 AGC1 5 Band gap AGC2 6 VREF2 7 AM AMIN1 8 CREG 9 AGC (AM) 10 SSO20 20 GND2 19 FMOUT 18 AGCIN AGCCONST 15 VREF4 14 AMOUT1 13 GND1 12 TCONST 11 AGCAM 4913J–AUDR–10/09 ...

  • Page 3

    ... 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 Ground 22 FMGAIN FM gain adjustment 23 FMIN FM input 24 VREF1 Reference voltage 2.7V Paddle GND Ground Paddle 4913J–AUDR–10/ GND AGC1 AGCCONST 3 16 AGC2 4 15 VREF4 VREF2 5 14 AMOUT1 AMIN 6 13 GND1 ATR4251 3 ...

  • Page 4

    ... AM AGC constant capacitance 1 13 GND1 AM ground 14 AMOUT1 AM output, impedance matching 15 VREF4 Band gap 6V 16 AGCCONST FM AGC constant 17 VS Supply voltage 18 AGCIN FM AGC input 19 FMOUT FM output 20 GND2 FM ground ATR4251 4 FMGAIN 1 20 GND2 FMIN 2 19 FMOUT VREF1 3 18 AGCIN GND AGC1 5 16 AGCCONST AGC2 6 15 ...

  • Page 5

    ... In order to overcome this problem, ATR4251 provides an AM buffer amplifier with low input capacitance (less than 2.5 pF) and low output impedance (5 ). 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 ...

  • Page 6

    ... 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. ATR4251 6 1. See test circuit (Figure 8-1 on page 2 ...

  • Page 7

    ... T –50 to +150 stg All pins ±2000 All pins ±200 Symbol Value R 92 thJA R 40 thJA Symbol Min. Typ –40 amb T –40 amb ATR4251 Unit V mW °C °C °C ° Unit K/W K/W Max. Unit 11 V +90 °C +105 °C 7 ...

  • Page 8

    ... Type means 100% tested 100% correlation tested Characterized on samples 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 3. Demo board measurements (see ATR4251 8 = 10V 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN S ...

  • Page 9

    ... V V – 2.1V V – 1.9V V – 1.7V AGC – 0.2V V AGC – 2.1V V – 1.9V V – 1.7V AGC – 0.2V V AGC Pin18 ATR4251 Unit Type* µA ---------------- - C mV rms dBµ dBµV D dBµ dBµV C dBµV B dBµ ...

  • Page 10

    ... Type means 100% tested 100% correlation tested Characterized on samples 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 3. Demo board measurements (see ATR4251 10 = 10V 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN S ...

  • Page 11

    ... Common Emitter Configuration + 4 µF + 4.7 10 µF GND 22 pF FMOUT 2.2 nF 270 2.2 nF FMIN (1) Output impedance 50 4913J–AUDR–10/09 100 nF AGCIN 100 nF 150 4.7 µF 2.2 µF 1 µ 2.2 nF 2.2 nF adjustment 470 nF 500 4 µF 10 µF 220 Cant AMINP1 50 50 ATR4251 AMOUT1 AMAGCIN 11 ...

  • Page 12

    ... Testing AGC connector FM as input connector AM/FM_OUT as output 2. Testing AGC connector AM as input connector AM/FM_OUT as output R3 C28 C29 6 4 TR1 2 2 BA679 BA679 2 ATR4251 12 + R21 100 2.2 pF (4) C19 100 nF C18 ( + 100 nF (2) 100 C1 C4 RS1 L1 2 120 BC858 C11 ...

  • Page 13

    ... Figure 9-2. 4913J–AUDR–10/09 Antenna Dummy for Test Purposes Gen AGCIN ATR4251 OUTPUT 50 13 ...

  • Page 14

    ... Internal Circuitry Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) PIN SSO20 PIN QFN24 ATR4251 14 Symbol Equivalent Circuit FMGAIN FMIN FMOUT VREF1 GND AGC1 AGC2 NC VREF2 4913J–AUDR–10/09 ...

  • Page 15

    ... Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued) PIN SSO20 PIN QFN24 4913J–AUDR–10/09 Symbol Equivalent Circuit AMIN1 CREG AGCAMIN AGCAM ATR4251 15 ...

  • Page 16

    ... Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued) PIN SSO20 PIN QFN24 ATR4251 16 Symbol Equivalent Circuit TCONS AMOUT1 VREF4 AGCCONST 4913J–AUDR–10/09 ...

  • Page 17

    ... Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued) PIN SSO20 PIN QFN24 18 19 4913J–AUDR–10/09 Symbol Equivalent Circuit AGCIN ATR4251 18 17 ...

  • Page 18

    ... Ordering Information Extended Type Number ATR4251-TKSY ATR4251-TKQY ATR4251-PFQY ATR4251-PFPY 12. Package Information Figure 12-1. SSO20 0.25 ±0. Drawing-No.: 6.543-5056.01-4 Issue: 1; 10.03.04 ATR4251 18 Package SSO20 SSO20 QFN24 QFN24 6.75 -0.25 0.65 ±0.05 5.85 ±0. Remarks MOQ Sticks 830 pieces Taped and reeled 4000 pieces ...

  • Page 19

    ... Figure 12-2. QFN24 Package: QFN Exposed pad 2.15 x 2.15 (acc. JEDEC OUTLINE No. MO-220) Dimensions 4913J–AUDR–10/09 4 0.9 ±0 Drawing-No.: 6.543-5086.01-4 Issue: 2; 24.01.03 ATR4251 2.15 ±0. technical drawings according to DIN 6 specifications 7 0.5 nom. 19 ...

  • Page 20

    ... Revision No. 4913J-AUDR-10/09 4913I-AUDR-03/08 4913H-AUDR-10/07 4913G-AUDR-07/07 4913F-AUDR-06/07 4913E-AUDR-02/07 ATR4251 20 History Section 11 “Ordering Information” on page 18 changed Figure 1-1 “Block Diagram QFN24 Package” on page 1 changed Figure 2-1 “Pinning QFN24” on page 3 changed Table 2-1 “Pin Description QFN24” on page 3 changed Table 10-1 “Equivalent Pin Circuits (ESD Protection Circuits Not Shown) on page 14 changed Section 11 “ ...

  • Page 21

    ... Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDI- TIONS OF SALE LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ...