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
CREG
NC*
NC*
Paddle = GND
AGCCONST
AMOUT1
GND1
VREF4
VS
NC*
AGC1
VREF2
AMIN
AGC2
GND
NC*T
CONST
AGC
AM
AGC
(AM)
AGC
AMIN
VREF1
FM
IN
AGC
IN
FM
GAIN
FM
OUT
GND2
FM
amplifier
81012119
5
3
4
1
2
6
14
16
15
18
17
13
7
23 21 19202224
BAND
GAP
AM
AGC
* Pin must not be connected to any other pin or supply chain except GND.
Low-noise,
High-dynamic-
range AM/FM
Antenna
Amplifier IC
ATR4251
4913J–AUDR–10/09
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ATR4251
Figure 1-2. Block Diagram SSO20 Package
FMIN
VREF1
GND
AGC1
AGC2
AGCAMIN
CREG
AMIN1
VREF2
FMGAIN
2
3
4
5
6
10
9
8
7
1
FMOUT
AGCIN
VS
AGCCONST
VREF4
AGCAM
TCONST
GND1
AMOUT1
GND2
19
18
17
16
AGC
(AM)
Band
gap
AGC
SSO20
FM
amplifier
15
11
12
13
14
20
AM
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ATR4251
2. Pin Configuration
Figure 2-1. Pinning QFN24
NC
GND
AGC1
AGC2
VREF2
AMIN
NC
VS
AGCCONST
VREF4
AMOUT1
GND1
VREF1
FMIN
FMGAIN
GND2
FMOUT
AGCIN
NC
CREG
AGCAMIN
AGCAM
TCONST
NC
24 23 22 21 20 19
7 8 9 10 11 12
18
17
16
15
14
13
1
2
3
4
5
6
Table 2-1. Pin Description QFN24
Pin Symbol Function
1 NC Pin must not be connected to any other pin or supply chain except GND.
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.
8 CREG AM - AGC time constant capacitance 2
9 AGCAMIN AM - AGC input
10 AGCAM AM - AGC output for pin diode
11 TCONST AM - AGC - time constant capacitance 1
12 NC Pin must not be connected to any other pin or supply chain except GND.
13 GND1 Ground AM
14 AMOUT1 AM output, impedance matching
15 VREF4 Bandgap
16 AGCCONST FM AGC time constant
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 Ground
22 FMGAIN FM gain adjustment
23 FMIN FM input
24 VREF1 Reference voltage 2.7V
Paddle GND Ground Paddle
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ATR4251
Figure 2-2. Pinning SSO20
FMGAIN
FMIN
VREF1
GND
AGC1
AGC2
VREF2
AMIN1
CREG
AGCAMIN
GND2
FMOUT
AGCIN
VS
AGCCONS
T
VREF4
AMOUT1
GND1
TCONST
AGCAM
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Table 2-2. Pin Description SSO20
Pin Symbol Function
1 FMGAIN FM gain adjustment
2 FMIN FM input
3 VREF1 Reference voltage 2.7V
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 AM input, AM AGC
11 AGCAM AM AGC output for PIN diode
12 TCONST 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
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ATR4251
3. Functional Description
The ATR4251 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
(150 kHz to 30 MHz) that are usually used for AM transmission, and FM means any of the fre-
quency bands used world-wide for FM radio broadcast (70 MHz to 110 MHz).
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 sig-
nals 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 pro-
vide 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
100 pF) dramatically reduces the signal level at the tuner input.
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 (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 (0 dB), but
the insertion gain that is achieved when the buffer amplifier is inserted between antenna output
and cable may be much higher (35 dB). The actual value depends, of course, on antenna and
cable impedance.
The input of the amplifier is connected by an external 4.7 MΩ 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 atten-
uators 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 guar-
antees 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.
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ATR4251
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 overdriv-
ing the AM amplifier IC.
3.3 FM Amplifier
The FM amplifier is realized with a single NPN transistor. This allows use of an amplifier config-
uration 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)
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 900 MHz.
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 dis-
tortion. 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.
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ATR4251
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 VS12 V
Power dissipation, Ptot at Tamb = 90°C Ptot 550 mW
Junction temperature Tj150 °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
ESD HMB All pins ±2000 V
ESD MM All pins ±200 V
5. Thermal Resistance
Parameters 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
6. Operating Range
Parameters Symbol Min. Typ. Max. Unit
Supply voltage VS81011 V
Ambient temperature SSO20 package Tamb –40 +90 °C
Ambient temperature QFN 24 package Tamb –40 +105 °C
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ATR4251
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 Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
1.1 Supply currents 17 (17) IS11 14 17 mA A
1.2 Reference voltage 1
output Ivref1 = 1 mA 3 (24) VRef1 2.65 2.8 2.95 V A
1.3 Reference voltage 2
output 7 (5) VRef2 0.38 VS0.4 VS0.42 VSVB
1.4 Reference voltage 4
output Ivref4 = 3 mA 15 (15) VRef4 6.06.256.5 V A
2 AM Impedance Matching 150 kHz to 30 MHz (The Frequency Response from Pin 8 to Pin 14)
2.1 Input capacitance f = 1 MHz 8 (6) CAMIN 2.22.452.7 pF D
2.2 Input leakage current Tamb = 85°C 8 (6) 40 nA C
2.3 Output resistance 14 (14) ROUT 458ΩD
2.4 Voltage gain f = 1 MHz 8/14
(6/14) A 0.94 0.97 1 A
2.5 Output noise voltage
(rms value)
Pin 14 (14),
R78 =4.7MΩ,
B=9kHz, C
ANT =30pF
150 kHz
200 kHz
500 kHz
1 MHz
14 VN1
VN 2
VN3
VN4
–8
–9
–11
– 1 2
–6
–7
–9
– 1 0
dBµV
dBµV
dBµV
d B µ V
C
2.6 2nd harmonic
Vs=10V, 50Ω load,
fAMIN = 1 MHz, input
voltage = 120 dBµV
AMOUT1 –60 –58 dBc C
2.7 3rd harmonic
Vs=10V, 50Ω load,
fAMIN = 1 MHz, input
voltage = 120 dBµV
AMOUT1 –53 –50 dBc C
3AM AGC
3.1 Input resistance 10 (9) RAGCAMIN 40 50 kΩD
3.2 Input capacitance f = 1 MHz 10 (9) CAGCAMIN 2.6 3.2 3.8 pF D
3.3 AGC input voltage
threshold f = 1 MHz 10 (9) VAMth 75 77 79 dBµV B
3.4 3 dB corner frequency AGC threshold increased
by 3 dB 10 MHz D
3.5 Minimal AGCAM output
voltage
ViHF = 90 dBµV at pin
10 (9)
10/11
(9/10) VAGC VS–2.4 V
S–2.1 V
S–1.7 V A
3.6 Maximal AGCAM output
voltage ViHF = 0V at pin 10 (9) 10/11
(9/10) VAGC VS–0.2 V
S–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 V
S–0.3 V C
3.8 Maximum AGC sink
current
ViHF = 0V at pin 10 (9)
U (pin 12 (11)) = 2V 12 (11) IAMsink –150 –120 –90 µA A
*) 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”)
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ATR4251
3.9 Transconductance of
Level detector ViHF = VAMth at pin 10 (9) 10/12
(9/11) 20 C
3.10 IP3 at level detector
input
Figure 9-2 on page 13,
1MHzand1,1MHz,
120 dBµV
10 (9) 150 170 dBµV D
3.11 PIN diode current
generation
d(20 log IPin-diode)/dU
Pin12
T = 25°C, UPin12 =2V 30 dB/V D
3.12 Output resistance 9 (8) ROUT 27 35 45 kΩD
4 FM Amplifier
4.1 Emitter voltage 1 (22) 1.85 1.95 2.05 V A
4.2 Emitter voltage T = –40°C to +85°C 1 (22) 1.8 2.0 2.2 V C
4.3 Supply current limit Rε = 56Ω19 (20) I19 37 mA D
4.4 Maximum output
voltage VS = 10V 19 (20) 12 Vpp D
4.5 Input resistance f = 100 MHz 2 (23) RFMIN 50 ΩD
4.6 Output resistance f = 100 MHz 19 (20) RFMOUT 50 ΩD
4.7 Power gain(2) f=100MHz FMOUT/
FMIN G5dBA
4.8 Output noise voltage
(emitter circuit)(2) f=100MHz,
B = 120 kHz 19 (20) VN–5.1 dBµV D
4.9 OIP3 (emitter circuit)(2) f = 98 + 99 MHz 19 (20) IIP3 140 dBµV C
4.10 Gain(3) 6dBC
4.11 Noise figure(3) 2.8 dB C
4.12 OIP3(3) f = 98 + 99 MHz 148 dBµV C
Parameters Dependent of External Components in Application Circuit: RFMIN, RFMOUT, G, VN, IIP3
5FM 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 VSVC
5.4 AGC2 output voltage AGC2 active,
Vpin16 (16) = 1.7V 6 (4) VAGC VS – 2.1V VS – 1.9V VS – 1.7V V C
5.5 AGC2 output voltage AGC2 inactive,
Vpin16 (16) = 5V 6 (4) VAGC VS – 0.2V VS VC
5.6 Input resistance 18 (19) RPin18 17 21 25 kΩD
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 Min. Typ. Max. Unit Type*
*) 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”)
IAM sin k
VAMth
-------------------
µA
mVrms
-----------------
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4913J–AUDR–10/09
ATR4251
5.7 Input capacitance F = 100 MHz 18 (19) CPin18 1.51.751.9 pF D
5.8 IP3 at AGC input
Figure 9-2 on page 13,
100 MHz and 105 MHz,
VGen = 120 dBµV
18 (19) 150 dBµV D
5.9 IP3 at AGC input 900 MHz and 920 MHz
VGen = 120 dBµV 18 (19) 148 dBµV D
5.10 Max. AGC sink current ViHF =0V 16 I
Pin16 –11 –9 –7 µA C
5.11 Transconductance ViHF = Vth1,100,
dIPin16(16) /dU
Pin18(19)
dIPin16 /
dUPin18 0.8 1.0 1.3 mA/V
(rms) C
5.12 Gain AGC1, AGC2
UPin16 = 3V,
dUPin5(3) /dU
Pin16(16),
–dUPin6(4) /dU
Pin16(16)
0.50.560.6 C
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 Min. Typ. Max. Unit Type*
*) 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”)
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ATR4251
8. Test Circuit FM/AM
Figure 8-1. Common Emitter Configuration
FMIN
VREF1
GND
AGC1
AGC2
AGCAMIN
CREG
AMIN1
VREF2
FMGAIN
2
3
4
5
6
10
9
8
7
1
FMOUT
AGCIN
VS
AGCCONST
VREF4
AGCAM
TCONST
GND1
AMOUT1
GND2
19
18
17
16
AGC
(AM)
Band
gap
AGC
SSO20
FM
amplifier
15
11
12
13
14
20
1 nF
AM
+
++
+
+
22 pF
150 nH
100 nF
2.2 nF
2.2 nF
2.2 nF
220 nF
33 pF 15 nF
Cant
1 µF
1 µH
10 µF
10 µF
AGCIN
AMOUT1
AMINP1 AMAGCIN
GND
FMOUT
FMIN
VS
47Ω1)
4.7Ω
270Ω
56Ω
50Ω
68Ω
4.7 MΩ
22Ω
5 kΩ
4.7 µF 2.2 µF
+
100 nF
22 pF
2.2 nF
10 µF
4.7Ω
470 nF 500 pF
50Ω
(1) Output impedance 50Ω adjustment
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ATR4251
9. Application Circuit (Demo Board)
Figure 9-1. Common Base Configuration
FMIN
VREF1
GND
AGC1
AGC2
AGCAMIN
CREG
AMIN1
VREF2
FMGAIN
2
3
4
5
6
10
9
8
7
1
FMOUT
AGCIN
VS
AGCCONST
VREF4
AGCAM
TCONST
GND1
AMOUT1
GND2
19
18
17
16
AGC
(AM)
Band
gap
AGC
SSO20
FM
amplifier
15
11
12
13
14
20
1 nF
2.2 µF
AM
+
1 pF(4)
1 pF
10 nF
R11(2)
(2)
(2)
R12(2)
2.2 pF
(4)
C18
C28
C1
C6
C20
C19
C17
33 pF C31
C13
C21
100 nF
C30
C26 C23
C27 C24
D3
BA779-2
R21
R7
R3
1 kΩ
R23
R9
R24
470 nH
470 nF
220 nF
L3
120 nH
L1
BC858
T2
180 nH
L3
100 nF
2.2 pF
C2
C29
2.2 nF
2.2 nF
C5
2.2 nF C4
22 pF
C3 C7
C10
15 nF
C32
100 nF
TR1
T1
BC858
64
13
220 nF
1 µF
C8
1 nF
10 µF
GND
2. Testing AM + AM AGC
connector AM as input
connector AM/FM_OUT as output
1. Testing FM + FM AGC
connector FM as input
connector AM/FM_OUT as output
(2) Leakage current reduction
(3) AM AGC threshold
(4) AM AGC threshold
(1) AM Output impedance
(50Ω adjustment)
AM/FM application combined with AM AGC
with the following capability
AM
FM
AM/FM_OUT
VB+ 10
+VS
+VS
+VS
4.7Ω
4.7 MΩ
51Ω
R2
D1
BA679BA679
D2
100Ω
68Ω
R5
R4
R25
R8
R6
2Ω
RS1
47Ω
R1
100Ω
R10
100Ω
10 kΩ
2.2 kΩ
R20
33Ω(1)
3 kΩ(3)
10 kΩ(3)
+
+
+
100 nF
100 pF
C11
10 µF
10 µF
4.7 µF
4.7Ω
100 nF
C12
C33
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ATR4251
Figure 9-2. Antenna Dummy for Test Purposes
OUTPUT
AGCIN
Gen
1 nF
50Ω
50Ω
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ATR4251
10. Internal Circuitry
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown)
PIN SSO20 PIN QFN24 Symbol Equivalent Circuit
1
2
19
22
23
20
FMGAIN
FMIN
FMOUT
324 VREF1
4, 13, 20 2, 13, 21 GND
5
6
3
4
AGC1
AGC2
1, 7, 12, 18 NC
7 5 VREF2
19
1
2
3
5
VS
7
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86 AMIN1
9 8 CREG
10 9 AGCAMIN
11 10 AGCAM
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20 PIN QFN24 Symbol Equivalent Circuit
8
VS
9
10
11
16
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ATR4251
12 11 TCONS
14 14 AMOUT1
15 15 VREF4
16 16 AGCCONST
17 17 VS
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20 PIN QFN24 Symbol Equivalent Circuit
12
14
15
16
17
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ATR4251
18 19 AGCIN
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20 PIN QFN24 Symbol Equivalent Circuit
18
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ATR4251
12. Package Information
Figure 12-1. SSO20
11. Ordering Information
Extended Type Number Package Remarks MOQ
ATR4251-TKSY SSO20 Sticks 830 pieces
ATR4251-TKQY SSO20 Taped and reeled 4000 pieces
ATR4251-PFQY QFN24, 4 mm ×4 mm Taped and reeled 6000 pieces
ATR4251-PFPY QFN24, 4 mm ×4 mm Taped and reeled 1500 pieces
Package: SSO20
Dimensions in mm
specifications
according to DIN
technical drawings
6.75-0.25
1120
101
Issue: 1; 10.03.04
Drawing-No.: 6.543-5056.01-4
5.85±0.05
1.3±0.05
0.15±0.05
0.65±0.05
5.4±0.2
4.4±0.1
6.45±0.15
0.25±0.05
0.05+0.1
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ATR4251
Figure 12-2. QFN24
0.23±0.07
0.4±0.1
0.9±0.1 2.15±0.15
712
2419
13
18
6
1
24
6
1
4
0.5 nom.
Package: QFN 24 - 4 x 4
Exposed pad 2.15 x 2.15
(acc. JEDEC OUTLINE No. MO-220)
Dimensions in mm
specifications
according to DIN
technical drawings
Issue: 2; 24.01.03
Drawing-No.: 6.543-5086.01-4
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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. History
4913J-AUDR-10/09 • Section 11 “Ordering Information” on page 18 changed
4913I-AUDR-03/08
• 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 “Ordering Information” on page 18 changed
4913H-AUDR-10/07
• Section 7 “Electrical Characteristics” numbers 1.1, 1.2, 1.3, 1.4, 2.4, 3.5,
3.6, 4.3 and 5.1 on pages 8 to 9 changed
• Section 7 “Electrical Characteristics” numbers 2.8 and 2.9 deleted
• Figure 8-1 “Common Emitter Configuration” on page 11 changed
4913G-AUDR-07/07 • Figure 8-1 “Common Emitter Configuration” on page 11 changed
• Figure 9-1 “Common Base Configuration” on page 12 changed
4913F-AUDR-06/07
• Put datasheet in a new template
• Figure 8-1 “Common Emitter Configuration” on page 11 changed
• Figure 8-1 “Common Base Configuration” on page 12 changed
4913E-AUDR-02/07
• Put datasheet in a new template
• Figure 1-1 exchanged with figure 1-2 on pages 1 to 2
• Figure 2-1 exchanged with figure 2-2 on pages 3 to 4
• Table 2-1 exchanged with table 2-2 on pages 3 to 4
• Section 3.1 “AM Amplifier” on page 5 changed
• Section 3.4 “FM AGC” on page 6 renamed in “FM/TV AGC” and changed
• Section 7 “Electrical Characteristics” on pages 8 to 10 changed
• Figure 9-1 “Common Base Configuration” on page 12 changed
4913J–AUDR–10/09
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