ATR4251-TKQY19 [ATMEL]
Consumer IC;
| 型号： | ATR4251-TKQY19 |
| 厂家： | 
ATMEL |
| 描述： | Consumer IC |
| 文件： | 总21页 (文件大小：413K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
Low-noise,
High-dynamic-
range AM/FM
Antenna
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
Amplifier IC
FM
FM
FM
AGC
IN
VREF1 IN GAIN GND2 OUT
Paddle = GND
ATR4251
24
23
22
21
20
19
FM
amplifier
NC*
GND
NC*
1
2
3
4
5
6
18
17
16
15
14
13
VS
BAND
GAP
AGC1
AGC2
VREF2
AMIN
AGC
AGCCONST
VREF4
AMOUT1
GND1
AM
7
AGC
(AM)
8
9
10
11
12
CREG AGC AGC
T
NC*
NC*
AMIN AM CONST
* Pin must not be connected to any other pin or supply chain except GND.
4913J–AUDR–10/09
Figure 1-2. Block Diagram SSO20 Package
FMGAIN
FMIN
1
2
3
4
5
6
7
8
9
20 GND2
FM
amplifier
19 FMOUT
18 AGCIN
17 VS
VREF1
GND
AGC
AGC1
AGC2
VREF2
AMIN1
CREG
16 AGCCONST
15 VREF4
14 AMOUT1
13 GND1
Band
gap
AM
AGC
12 TCONST
11 AGCAM
(AM)
AGCAMIN 10
SSO20
2
ATR4251
4913J–AUDR–10/09
ATR4251
2. Pin Configuration
Figure 2-1. Pinning QFN24
24 23 22 21 20 19
18
NC
GND
NC
1
2
3
4
5
6
17 VS
AGC1
AGC2
VREF2
AMIN
16 AGCCONST
15
14
13
VREF4
AMOUT1
GND1
7
8
9 10 11 12
Table 2-1.
Pin Description QFN24
Pin
1
Symbol
NC
Function
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
AMIN
Reference voltage for pin diode
6
AM input, impedance matching
7
NC
Pin must not be connected to any other pin or supply chain except GND.
8
CREG
AGCAMIN
AGCAM
TCONST
NC
AM - AGC time constant capacitance 2
9
AM - AGC input
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Paddle
AM - AGC output for pin diode
AM - AGC - time constant capacitance 1
Pin must not be connected to any other pin or supply chain except GND.
GND1
AMOUT1
VREF4
AGCCONST
VS
Ground AM
AM output, impedance matching
Bandgap
FM AGC time constant
Supply voltage
NC
Pin must not be connected to any other pin or supply chain except GND.
AGCIN
FMOUT
GND2
FMGAIN
FMIN
FM AGC input
FM output
Ground
FM gain adjustment
FM input
VREF1
GND
Reference voltage 2.7V
Ground Paddle
3
4913J–AUDR–10/09
Figure 2-2. Pinning SSO20
FMGAIN
FMIN
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND2
FMOUT
AGCIN
VS
VREF1
GND
AGC1
AGCCONST
VREF4
AMOUT1
GND1
AGC2
VREF2
AMIN1
CREG
TCONST
AGCAM
AGCAMIN
Table 2-2.
Pin Description SSO20
Pin
1
Symbol
FMGAIN
FMIN
Function
FM gain adjustment
FM input
2
3
VREF1
GND
Reference voltage 2.7V
FM ground
4
5
AGC1
AGC output for PIN diode
AGC output for PIN diode
6
AGC2
7
VREF2
AMIN1
CREG
Reference voltage for PIN diode
AM input, impedance matching
AM AGC constant capacitance 2
AM input, AM AGC
8
9
10
11
12
13
14
15
16
17
18
19
20
AGCAMIN
AGCAM
TCONST
GND1
AM AGC output for PIN diode
AM AGC constant capacitance 1
AM ground
AMOUT1
VREF4
AGCCONST
VS
AM output, impedance matching
Band gap 6V
FM AGC constant
Supply voltage
AGCIN
FMOUT
GND2
FM AGC input
FM output
FM ground
4
ATR4251
4913J–AUDR–10/09
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.
5
4913J–AUDR–10/09
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.
6
ATR4251
4913J–AUDR–10/09
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
VS
Value
12
Unit
V
Supply voltage
Power dissipation, Ptot at Tamb = 90°C
Junction temperature
Ambient temperature SSO20 package
Ambient temperature QFN24 package
Storage temperature
ESD HMB
Ptot
550
mW
°C
°C
°C
°C
V
Tj
150
Tamb
Tamb
Tstg
–40 to +90
–40 to +105
–50 to +150
±2000
All pins
All pins
ESD MM
±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
VS
Min.
8
Typ.
Max.
11
Unit
V
Supply voltage
10
Ambient temperature SSO20 package
Ambient temperature QFN 24 package
Tamb
–40
–40
+90
+105
°C
°C
Tamb
7
4913J–AUDR–10/09
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)
IS
11
14
17
mA
A
Reference voltage 1
output
1.2
Ivref1 = 1 mA
3 (24)
7 (5)
VRef1
VRef2
VRef4
2.65
0.38 VS
6.0
2.8
0.4 VS
6.25
2.95
0.42 VS
6.5
V
V
V
A
B
A
Reference voltage 2
output
1.3
1.4
Reference voltage 4
output
I
vref4 = 3 mA
15 (15)
2
AM Impedance Matching 150 kHz to 30 MHz (The Frequency Response from Pin 8 to Pin 14)
2.1
2.2
2.3
Input capacitance
Input leakage current
Output resistance
f = 1 MHz
8 (6)
8 (6)
CAMIN
2.2
2.45
2.7
40
8
pF
nA
Ω
D
C
D
Tamb = 85°C
14 (14)
ROUT
A
4
5
8/14
(6/14)
2.4
Voltage gain
f = 1 MHz
0.94
0.97
1
A
Pin 14 (14),
R78 = 4.7 MΩ,
B = 9 kHz, CANT = 30 pF
150 kHz
200 kHz
500 kHz
Output noise voltage
(rms value)
2.5
14
VN1
VN2
VN3
VN4
–8
–9
–11
– 12
–6
–7
–9
dBµV
dBµV
dBµV
d B µ V
C
1 MHz
–1 0
Vs = 10V, 50Ω load,
fAMIN = 1 MHz, input
voltage = 120 dBµV
2.6
2.7
2nd harmonic
3rd harmonic
AMOUT1
AMOUT1
–60
–53
–58
–50
dBc
dBc
C
C
Vs = 10V, 50Ω load,
fAMIN = 1 MHz, input
voltage = 120 dBµV
3
AM AGC
3.1
3.2
Input resistance
Input capacitance
10 (9)
10 (9)
RAGCAMIN
CAGCAMIN
40
50
kΩ
D
D
f = 1 MHz
f = 1 MHz
2.6
3.2
3.8
79
pF
AGC input voltage
threshold
3.3
3.4
3.5
3.6
3.7
3.8
10 (9)
VAMth
75
10
77
dBµV
MHz
V
B
D
A
A
C
A
AGC threshold increased
by 3 dB
3 dB corner frequency
Minimal AGCAM output ViHF = 90 dBµV at pin
voltage
10/11
(9/10)
VAGC
VAGC
VAGC
IAMsink
VS – 2.4 VS – 2.1 VS – 1.7
VS – 0.2 VS – 0.1
10 (9)
Maximal AGCAM output
voltage
10/11
(9/10)
ViHF = 0V at pin 10 (9)
V
Maximal AGCAM output ViHF = 0V at pin 10 (9)
10/11
(9/10)
VS – 0.4 VS – 0.3
V
voltage(1)
T = +85°C
Maximum AGC sink
current
ViHF = 0V at pin 10 (9)
U (pin 12 (11)) = 2V
12 (11)
–150
–120
–90
µA
*) 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
ATR4251
4913J–AUDR–10/09
ATR4251
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*
IAM sin k
-------------------
VAMth
Transconductance of
Level detector
10/12
(9/11)
µA
mVrms
----------------
3.9
ViHF = VAMth at pin 10 (9)
20
C
Figure 9-2 on page 13,
1 MHz and 1,1MHz,
120 dBµV
IP3 at level detector
input
3.10
3.11
10 (9)
150
27
170
dBµV
D
d(20 log IPin-diode) / dUPin12
T = 25°C, UPin12 = 2V
PIN diode current
generation
30
35
dB/V
D
D
3.12 Output resistance
9 (8)
ROUT
45
kΩ
4
FM Amplifier
4.1
4.2
4.3
Emitter voltage
Emitter voltage
Supply current limit
1 (22)
1 (22)
1.85
1.8
1.95
2.0
2.05
2.2
37
V
V
A
C
D
T = –40°C to +85°C
R
= 56Ω
19 (20)
I19
mA
ε
Maximum output
voltage
4.4
VS = 10V
19 (20)
12
Vpp
D
4.5
4.6
Input resistance
f = 100 MHz
f = 100 MHz
2 (23)
RFMIN
50
50
Ω
Ω
D
D
Output resistance
19 (20)
RFMOUT
FMOUT/
FMIN
4.7
Power gain(2)
f = 100 MHz
G
5
dB
A
D
Output noise voltage
(emitter circuit)(2)
OIP3 (emitter circuit)(2) f = 98 + 99 MHz
f = 100 MHz,
B = 120 kHz
4.8
4.9
19 (20)
19 (20)
VN
–5.1
dBµV
IIP3
140
6
dBµV
dB
C
C
C
C
4.10 Gain(3)
4.11 Noise figure(3)
4.12 OIP3(3)
2.8
148
dB
f = 98 + 99 MHz
dBµV
Parameters Dependent of External Components in Application Circuit: RFMIN, RFMOUT, G, VN, IIP3
5
FM AGC
f = 100 MHz
f = 900 MHz
Vth1,100
Vthl,900
81
81
83
85
85
87
dBµV
dBµV
B
B
5.1
AGC threshold
18 (19)
5 (24)
5 (24)
6 (4)
AGC1 active,
Vpin16 (16) = 5V
5.2
5.3
5.4
AGC1 output voltage
AGC1 output voltage
AGC2 output voltage
VAGC
VAGC
VAGC
VS – 2.1V VS – 1.9V VS – 1.7V
VS – 0.2V VS
VS – 2.1V VS – 1.9V VS – 1.7V
V
V
V
C
C
C
AGC1 inactive,
Vpin16 (16) = 1.7V
AGC2 active,
Vpin16 (16) = 1.7V
AGC2 inactive,
Vpin16 (16) = 5V
5.5
5.6
AGC2 output voltage
Input resistance
6 (4)
VAGC
VS – 0.2V
17
VS
21
V
C
D
18 (19)
RPin18
25
kΩ
*) 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”)
9
4913J–AUDR–10/09
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*
5.7
1.5
1.75
1.9
pF
D
Input capacitance
F = 100 MHz
18 (19)
CPin18
Figure 9-2 on page 13,
100 MHz and 105 MHz,
VGen = 120 dBµV
5.8
IP3 at AGC input
18 (19)
150
dBµV
D
900 MHz and 920 MHz
5.9
IP3 at AGC input
18 (19)
16
148
–9
dBµV
µA
D
C
C
VGen = 120 dBµV
5.10 Max. AGC sink current ViHF = 0V
IPin16
–11
0.8
–7
ViHF = Vth1,100
,
dIPin16
dUPin18
/
mA/V
(rms)
5.11 Transconductance
1.0
1.3
dIPin16(16) / dUPin18(19)
U
Pin16 = 3V,
dUPin5(3) / dUPin16(16)
–dUPin6(4) / dUPin16(16)
5.12 Gain AGC1, AGC2
,
0.5
0.56
0.6
C
*) 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
ATR4251
4913J–AUDR–10/09
ATR4251
8. Test Circuit FM/AM
Figure 8-1. Common Emitter Configuration
+
4.7Ω
VS
10 µF 100 nF
470 nF 500 pF
AMOUT1
5 kΩ
AGCIN
+
4.7Ω
10 µF 100 nF
GND
150 nH
22 pF 4.7 µF 2.2 µF
1 nF
1)
47Ω
+
+
22 pF
FMOUT
2.2 nF
270Ω
68Ω
4.7 MΩ
1 µH
+
+
22Ω
56Ω
2.2 nF
1 µF
10 µF
220 nF
33 pF
Cant
15 nF
2.2 nF
2.2 nF
FMIN
AMINP1
AMAGCIN
50Ω
50Ω
(1) Output impedance 50Ω adjustment
11
4913J–AUDR–10/09
9. Application Circuit (Demo Board)
Figure 9-1. Common Base Configuration
AM/FM_OUT
C21
+VS
+VS
R23
C30
C26
C23
+
+
4.7Ω
VB+ 10
GND
R11(2)
10 kΩ
R10
100Ω
100 nF 2.2 µF
C17
10 µF 100 nF
180 nH
L3
R24
470 nF
C31
C27
C24
4.7Ω
33 pF
R20
10 µF 100 nF
R21
T2
BC858
100Ω
33Ω(1)
L3
2.2 pF
(4)
C19
C12
1 nF
470 nH
C33
C13
100 nF
C20
+
AM/FM application combined with AM AGC
with the following capability
C18
1 pF(4)
4.7 µF
220 nF
1. Testing FM + FM AGC
connector FM as input
R12(2)
connector AM/FM_OUT as output
2.2 kΩ
2. Testing AM + AM AGC
connector AM as input
connector AM/FM_OUT as output
D3
R3
C28
1 pF
1 kΩ
BA779-2
C29
6
1
4
3
TR1
2.2 nF
C2
2.2 nF
D1
R25
68Ω
+VS
R4
D2
4.7 MΩ
R6 R5
+
C7
BA679
C5
2.2 nF
BA679
C3
C32
10 µF
R2
51Ω
R1
47Ω
1 µF
100 nF
(2)
100Ω
C10
C1
2.2 pF
C4
RS1
2Ω
L1
120 nH
R7
220 nF 15 nF
R9
10 kΩ(3)
22 pF
FM
AM
(2)
C8
T1
R8
3 kΩ(3)
BC858
1 nF
C6
10 nF
C11
100 pF
(1) AM Output impedance
(50Ω adjustment)
(2) Leakage current reduction
(3) AM AGC threshold
(4) AM AGC threshold
12
ATR4251
4913J–AUDR–10/09
ATR4251
Figure 9-2. Antenna Dummy for Test Purposes
OUTPUT
50Ω
1 nF
50Ω
Gen
AGCIN
13
4913J–AUDR–10/09
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
GND
3
4, 13, 20
2, 13, 21
VS
5
6
3
4
AGC1
AGC2
5
1, 7, 12, 18
NC
7
5
VREF2
7
14
ATR4251
4913J–AUDR–10/09
ATR4251
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
15
4913J–AUDR–10/09
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20
PIN QFN24
Symbol
Equivalent Circuit
12
11
TCONS
12
14
14
AMOUT1
14
15
15
15
VREF4
16
16
16
AGCCONST
17
17
VS
16
ATR4251
4913J–AUDR–10/09
ATR4251
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20
PIN QFN24
Symbol
Equivalent Circuit
18
18
19
AGCIN
17
4913J–AUDR–10/09
11. Ordering Information
Extended Type Number
Package
Remarks
MOQ
ATR4251-TKSY
SSO20
Sticks
830 pieces
4000 pieces
6000 pieces
1500 pieces
ATR4251-TKQY
SSO20
Taped and reeled
Taped and reeled
Taped and reeled
ATR4251-PFQY
QFN24, 4 mm × 4 mm
QFN24, 4 mm × 4 mm
ATR4251-PFPY
12. Package Information
Figure 12-1. SSO20
5.4±0.2
4.4±0.1
6.75-0.25
6.45±0.15
0.25±0.05
0.65±0.05
5.85±0.05
20
11
Package: SSO20
Dimensions in mm
technical drawings
according to DIN
specifications
1
10
Drawing-No.: 6.543-5056.01-4
Issue: 1; 10.03.04
18
ATR4251
4913J–AUDR–10/09
ATR4251
Figure 12-2. QFN24
Package: QFN 24 - 4 x 4
Exposed pad 2.15 x 2.15
(acc. JEDEC OUTLINE No. MO-220)
Dimensions in mm
0.9±0.1
4
2.15±0.15
24
1
19
24
18
13
1
technical drawings
according to DIN
specifications
6
6
12
7
0.5 nom.
Drawing-No.: 6.543-5086.01-4
Issue: 2; 24.01.03
19
4913J–AUDR–10/09
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
• 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
4913I-AUDR-03/08
4913H-AUDR-10/07
• Table 10-1 “Equivalent Pin Circuits (ESD Protection Circuits Not Shown)
on page 14 changed
• Section 11 “Ordering Information” on page 18 changed
• 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
• Figure 8-1 “Common Emitter Configuration” on page 11 changed
• Figure 9-1 “Common Base Configuration” on page 12 changed
4913G-AUDR-07/07
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
• 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
4913E-AUDR-02/07
• 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
20
ATR4251
4913J–AUDR–10/09
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