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 applications, and is suitable for windshield and roof antennas.
Figure 1-1.
Block Diagram QFN24 Package
VREF1
FM
IN
FM
FM
GAIN GND 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
15
5
14
AM
AGC
(AM)
6
7
8
9
13
10
11
Low-noise,
High-dynamicrange AM/FM
Antenna
Amplifier IC
ATR4251
NC*
VS
Preliminary
AGCCONST
VREF4
AMOUT1
GND
12
T
NC*
NC* CREG AGC AGC
AMIN AM CONST
* Pin must not be connected to any other pin or supply chain except GND.
4913E–AUDR–02/07
Figure 1-2.
Block Diagram SSO20 Package
FMGAIN
1
FMIN
2
VREF1
3
GND
4
AGC1
5
AGC2
6
VREF2
7
AMIN1
8
CREG
9
20 GND2
FM
amplifier
19 FMOUT
18 AGCIN
AGC
17 VS
16 AGCCONST
Band
gap
15 VREF4
14 AMOUT1
AM
AGC
(AM)
13 GND1
12 TCONST
11 AGCAM
AGCAMIN 10
SSO20
2
ATR4251 [Preliminary]
4913E–AUDR–02/07
ATR4251 [Preliminary]
2. Pin Configuration
Pinning QFN24
VREF1
FMIN
FMGAIN
GND
FMOUT
AGCIN
Figure 2-1.
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
GND
NC
CREG
AGCAMIN
AGCAM
TCONST
NC
NC
GND
AGC1
AGC2
VREF2
AMIN
Table 2-1.
Pin Description QFN24
Pin
Symbol
Function
1
NC
2
GND
Ground FM
3
AGC1
AGC output for pin diode
Pin must not be connected to any other pin or supply chain except GND.
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
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
GND
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
GND
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
3
4913E–AUDR–02/07
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
GND2
FMOUT
AGCIN
VS
AGCCONST
VREF4
AMOUT1
GND1
TCONST
AGCAM
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
FM input
Reference voltage 2.7V
AM input, AM AGC
11
AGCAM
AM AGC output for PIN diode
12
TCONST
AM AGC constant capacitance 1
13
GND1
14
AMOUT1
AM ground
AM output, impedance matching
15
VREF4
16
AGCCONST
Band gap 6V
17
VS
Supply voltage
18
AGCIN
FM AGC input
19
FMOUT
FM output
20
GND2
FM ground
FM AGC constant
ATR4251 [Preliminary]
4913E–AUDR–02/07
ATR4251 [Preliminary]
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 frequency 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 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
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 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.
5
4913E–AUDR–02/07
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)
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 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
ATR4251 [Preliminary]
4913E–AUDR–02/07
ATR4251 [Preliminary]
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
ESD HMB
All pins
±2000
V
ESD MM
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
Junction temperature
5. Thermal Resistance
Parameters
6. Operating Range
Parameters
Symbol
Min.
Typ.
10
Max.
Unit
VS
8
11
V
Ambient temperature SSO20 package
Tamb
–40
+90
°C
Ambient temperature QFN 24 package
Tamb
–40
+105
°C
Supply voltage
7
4913E–AUDR–02/07
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
1.4
2
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
17 (17)
IS
10
14
17
mA
A
VS = 8V to 11V,
T = 25°C, Ivref1 < 1.4 mA
3 (24)
VRef1
2.7
2.8
2.9
V
A
Reference voltage 2
output
VS = 8V to 11V
7 (5)
VRef2
0.38 VS
0.4 VS
0.42 VS
V
B
Reference voltage 4
output
VS = 8V to 11V,
Ivref4 < 5 mA
15 (15)
VRef4
6.1
6.3
6.5
V
A
2.7
pF
D
40
nA
C
Ω
D
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)
2.2
Input leakage current
Tamb = 85°C
8 (6)
2.3
Output resistance
14 (14)
ROUT
4
5
8
Voltage gain
f = 1 MHz
8/14
(6/14)
A
0.85
0.90
0.96
2.5
Output noise voltage
(rms value)
Pin 14 (14),
R78 = 4.7 MΩ,
B = 9 kHz, CANT = 30 pF
150 kHz
200 kHz
500 kHz
1 MHz
–8
–9
–11
–12
–6
–7
–9
–10
dBµV
dBµV
dBµV
dBµV
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
2.8
2nd harmonic
Vs = 8V, 50Ω load,
fAMIN = 1 MHz, input
voltage = 120 dBµV
AMOUT1
–60
–58
dBc
C
2.9
3rd harmonic
Vs = 8V, 50Ω load,
fAMIN = 1 MHz, input
voltage = 120 dBµV
AMOUT1
–53
–50
dBc
C
kΩ
D
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
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
MHz
D
3.5
Minimal AGCAM output ViHF = 90 dBµV at pin
voltage
10 (9)
V
A
10
10/11
(9/10)
VAGC
VS – 2.1
VS – 1.9
VS – 1.7
*) 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 [Preliminary]
4913E–AUDR–02/07
ATR4251 [Preliminary]
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
3.6
Test Conditions
Pin
Symbol
Min.
Typ.
Maximal AGCAM output
ViHF = 0V at pin 10 (9)
voltage
10/11
(9/10)
VAGC
VS – 0.1
3.7
Maximal AGCAM output ViHF = 0V at pin 10 (9)
T = +85°C
voltage(1)
10/11
(9/10)
VAGC
3.8
Maximum AGC sink
current
ViHF = 0V at pin 10 (9)
U (pin 12 (11)) = 2V
12 (11)
IAMsink
3.9
Transconductance of
Level detector
ViHF = VAMth at pin 10 (9)
10/12
(9/11)
I AM sin k
------------------V AMth
3.10
IP3 at level detector
input
Figure 9-2 on page 13,
1 MHz and 1,1MHz,
120 dBµV
10 (9)
3.11
PIN diode current
generation
d(20 log IPin-diode) / dUPin12
T = 25°C, UPin12 = 2V
3.12
Output resistance
9 (8)
Unit
Type*
VS
V
A
VS – 0.4
VS – 0.3
V
C
–150
–120
µA
A
20
µA ---------------mV rms
C
170
dBµV
D
30
dB/V
D
150
ROUT
Max.
–90
27
35
45
kΩ
D
1 (22)
1.85
1.95
2.05
V
A
1 (22)
1.8
2.0
2.2
V
C
35
mA
D
Vpp
D
4
FM Amplifier
4.1
Emitter voltage
4.2
Emitter voltage
4.3
Supply current limit
4.4
Maximum output
voltage
VS = 10V
19 (20)
4.5
Input resistance
f = 100 MHz
2 (23)
RFMIN
50
Ω
D
4.6
Output resistance
f = 100 MHz
19 (20)
RFMOUT
50
Ω
D
G
5
dB
A
T = –40°C to +85°C
19 (20)
I19
12
4.7
Power gain(2)
f = 100 MHz
FMOUT/
FMIN
4.8
Output noise voltage
(emitter circuit)(2)
f = 100 MHz,
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
6
dB
C
2.8
dB
C
148
dBµV
C
dBµV
dBµV
B
B
4.10
(3)
Gain
(3)
4.11
Noise figure
4.12
(3)
OIP3
f = 98 + 99 MHz
Parameters Dependent of External Components in Application Circuit: RFMIN, RFMOUT, G, VN, IIP3
5
FM AGC
81
83
83
85
85
87
5.1
AGC threshold
f = 100 MHz
f = 900 MHz
18 (19)
Vth1,100
Vthl,900
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
V
C
VS
*) 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
4913E–AUDR–02/07
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
5.4
AGC2 output voltage
AGC2 active,
Vpin16 (16) = 1.7V
6 (4)
VAGC
5.5
AGC2 output voltage
AGC2 inactive,
Vpin16 (16) = 5V
6 (4)
VAGC
5.6
Input resistance
18 (19)
RPin18
17
21
25
kΩ
D
CPin18
1.5
1.75
1.9
pF
D
5.7
Min.
Typ.
Max.
Unit
Type*
VS – 2.1V VS – 1.9V VS – 1.7V
V
C
VS – 0.2V
V
C
VS
Input capacitance
F = 100 MHz
18 (19)
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
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)
16
IPin16
–11
–9
–7
µA
C
dIPin16 /
dUPin18
0.8
1.0
1.3
mA/V
(rms)
C
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 [Preliminary]
4913E–AUDR–02/07
ATR4251 [Preliminary]
8. Test Circuit FM/AM
Figure 8-1.
Common Emitter Configuration
VS
4.7Ω
+
10 µF
100 nF
470 nF
AMOUT1
500 pF
5 kΩ
AGCIN
22Ω
2.2 nF
SO20
220 nF
+
55Ω
10
9
CREG
8
AMIN1
4.7 MΩ
1 µH
11
AGC
(AM)
AM
12
13
14
VREF2
7
Band
gap
6
AGC2
AGCAM
TCONST
+
GND1
AMOUT1
+
VREF4
+
AGC
4
GND
3
VREF1
FMIN
FMGAIN
1
270Ω
2
2.2 nF
17
VS
AGCIN
18
19
FM
amplifier
20
GND2
FMOUT
FMOUT
22 pF
4.7 µF
47Ω1)
AGCAMIN
4.7 µF 2.2 µF
22 pF
15
150 nH
AGCCONST
100 nF
5
10 µF
GND
16
+
AGC1
4.7Ω
1 µF
33 pF
15 nF
2.2 nF
Cant
2.2 nF
FMIN
AMINP1
AMAGCIN
50Ω
50Ω
(1) Output impedance 50Ω adjustment
11
4913E–AUDR–02/07
9. Application Circuit (Demo Board)
Figure 9-1.
Common Base Configuration
AM/FM_OUT
+VS
+VS
R23
C21
100 nF
2.2 µF
180 nH
R24
4.7Ω + C27
10 µF
GND
C17
L3
C24
R11(2)
470 nF
C31
33 pF
100 nF
R20
R21
100Ω
T2
BC858
33Ω(1)
2.2 pF
(4)
L3
470 nH
C19
C12
100 nF C20
AM/FM application combined with AM AGC
with the following capability
TCONST
AGC
(AM)
AM
12
13
GND1
AMOUT1
14
VREF4
15
AGCCONST
16
VS
Band
gap
1 pF
220 nF
AGC
FM
amplifier
1 kΩ
17
AGCIN
18
19
20
GND2
FMOUT
1 pF(4)
2. Testing AM + AM AGC
connector AM as input
connector AM/FM_OUT as output
C28
C13
4.7 µF
C18
1. Testing FM + FM AGC
connector FM as input
connector AM/FM_OUT as output
R3
R10
100Ω
SO20
10 µF
C30
100 nF
C23
R12(2)
AGCAM
4.7Ω + C26
11
VB+ 10
D3
BA779-2
BA679
BA679
C1
R7
FM
2.2 pF
L1
120 nH
10
9
8
AMIN1
7
VREF2
6
AGC2
5
R6
R5
C10
100Ω
(2)
C7
220 nF 15 nF
C4
22 pF
R9
1 µF
RS1
2Ω
(2)
10 kΩ(3)
C8
R8
5 kΩ(3)
1 nF
T1
BC858
C6
10 nF
C9
R4
4.7 MΩ
C3
R1
47Ω
R2
51Ω
100 nF
2.2 nF
AGCAMIN
D2
C5
AM
4
+VS
D1
CREG
2.2 nF
AGC1
C2
GND
FMGAIN
TR1
3
3
VREF1
1
2
4
2.2 nF
FMIN
6
1
C29
C11
100 pF
(1) AM Output impedance
(50Ω adjustment)
(2) Leakage current reduction
(3) AM AGC threshold
(4) AM AGC threshold
12
ATR4251 [Preliminary]
4913E–AUDR–02/07
ATR4251 [Preliminary]
Figure 9-2.
Antenna Dummy for Test Purposes
OUTPUT
50Ω
1 nF
50Ω
Gen
AGCIN
13
4913E–AUDR–02/07
10. Internal Circuitry
Table 10-1.
PIN SSO20
Equivalent Pin Circuits (ESD Protection Circuits Not Shown)
PIN QFN24
Symbol
Equivalent Circuit
19
1
2
19
22
23
20
FMGAIN
FMIN
FMOU
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
5
7
ATR4251 [Preliminary]
4913E–AUDR–02/07
ATR4251 [Preliminary]
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
4913E–AUDR–02/07
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
16
ATR4251 [Preliminary]
4913E–AUDR–02/07
ATR4251 [Preliminary]
Table 10-1.
Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20
PIN QFN24
Symbol
18
19
AGCIN
Equivalent Circuit
18
17
4913E–AUDR–02/07
11. Ordering Information
Extended Type Number
Package
Remarks
ATR4251-TKSY
SSO20
Sticks
ATR4251-TKQY
SSO20
Taped and reeled
ATR4251-PFSY
QFN24, 4 mm × 4 mm
Sticks
ATR4251-PFQY
QFN24, 4 mm × 4 mm
Taped and reeled
12. Package Information
Figure 12-1. SSO20
5.4±0.2
1.3±0.05
0.05+0.1
0.25±0.05
6.45±0.15
0.65±0.05
0.15±0.05
4.4±0.1
6.75-0.25
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 [Preliminary]
4913E–AUDR–02/07
ATR4251 [Preliminary]
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
4
0.9±0.1
2.15±0.15
24
19
1
24
18
1
13
0.4±0.1
0.23±0.07
6
6
12
technical drawings
according to DIN
specifications
7
0.5 nom.
Drawing-No.: 6.543-5086.01-4
Issue: 2; 24.01.03
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
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
19
4913E–AUDR–02/07
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