ATR4252C-RAQW-1 [MICROCHIP]
IC ANTENNA AMP AM/FM 28QFN;
| 型号： | ATR4252C-RAQW-1 |
| 厂家： | 
MICROCHIP |
| 描述： | IC ANTENNA AMP AM/FM 28QFN |
| 文件： | 总20页 (文件大小：1090K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Atmel ATR4252C
All-in-one IC Solution for Active Antennas
DATASHEET
Features
● Highly integrated - All-in-one active antenna IC
● Integrated AGC for AM and FM
● Integrated driver for AM and FM pin diodes
● Integrated power supply regulator
● Integrated antenna sensor
● Separated AM LNA, AM buffer and FM amplifier
● High dynamic range for AM and FM
● Excellent noise performance
● 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
● Only small capacitor values necessary at AM AGC
● Large AM frequency range to cover DRM broadcast signals
9264B–AUDR–01/14
1.
Description
The Atmel® ATR4252C is a highly integrated high performance AM/FM antenna amplification IC with several features. The
device has built-in AGC's for both AM and FM, antenna detection, a power supply regulator as well as additional pre-integrated
peripherals.
The Atmel ATR4252C is based on BICMOS technology. The device is designed in particular for car application and is suitable
for active antennas located in several positions on the car such as bumpers, windscreen, mirrors or windows.
Figure 1-1. Block Diagram
AM LNA
BIAS
FM
REF
21
AMPD GND2 BIAS
FMB
17
FME
16
FMPD
15
22
20
19
18
FM
Amplifier
AM
23
24
25
26
27
28
14
13
12
11
10
9
AM LNA IN
FMC
LNA
AM LNA
SOURCE
Voltage
Supply
AGC
(FM)
FMDET
FMTC
VS
CASCODE
FILTER
AM LNA OUT
AMBIAS
Antenna
Detect
Over
Voltage
AGC
(AM)
AMOUT
GND1
AM
Buffer
AMBUF IN
1
2
3
4
5
6
7
8
ANTENNA
VS VSTART OVDET VREGO AMTC1 AMTC2 AMDET
SENSE FILTER
Atmel ATR4252C [DATASHEET]
2
9264B–AUDR–01/14
2.
Pin Configuration
Figure 2-1. Pinning VQFN 4x5 / 28L
22 21 20 19 18 17 16 15
AM LNA IN
23
24
25
14
13
12
11
10
9
FMC
AM LNA SOURCE
CASCODE FILTER
FMDET
FMTC
VS
ATR4252
AM LNA OUT 26
AMBIAS
27
28
AMOUT
GND1
AMBUF IN
1
2
3
4
5
6
7
8
Table 2-1. Pin Description
Pin
1
Symbol
ANTENNA SENSE
Function
Antenna sense input
Supply voltage filter input
2
VS FILTER
VSTART
OVDET
VREGO
AMTC1
AMTC2
AMDET
GND1
3
Comparator input of voltage detector
Overvoltage detection input
Output of voltage regulator
AM AGC time-constant capacitance 1
AM AGC time-constant capacitance 2
Level detector input of AM-AGC
Ground AM
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
AMOUT
VS
AM output, impedance matching
Supply voltage
FMTC
FM AGC time constant
FMDET
FMC
Level detector input of FM-AGC
Collector of FM amplifier (NPN)
FM AGC output for pin diode
FM amplifier emitter(NPN)
FM amplifier base (NPN)
Reference voltage 2.7V FM
Ground FM
FMPD
FME
FMB
FMBIAS
GND2
AMPD
AM AGC output for pin diode
Atmel ATR4252C [DATASHEET]
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9264B–AUDR–01/14
Table 2-1. Pin Description (Continued)
Pin
21
Symbol
REF
Function
Reference voltage 6V
22
AM LNA BIAS
AM LNA IN
AM LNA SOURCE
CASCODE FILTER
AM LNA OUT
AMBIAS
Reference voltage for AM LNA IN
AM LNA input terminal
23
24
AM LNA source terminal
AM Cascode filter terminal
AM LNA output terminal
Reference voltage for AMBUF IN
AM Buffer amplifier input, impedance matching
Ground paddle
25
26
27
28
AMBUF IN
Paddle
GND
Atmel ATR4252C [DATASHEET]
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9264B–AUDR–01/14
3.
Functional Description
The Atmel® ATR4252C is a highly integrated AM/FM antenna IC with lots of features and functions. In fact the most important
feature is the impedance matching on both the antenna input and the cable. The Atmel ATR4252C compensates cable losses
between the antenna (for example, windscreen, roof or bumper antennas) and the car radio, which is usually placed far away
from the antenna.
AM means long wave (LW), medium wave (MW) and short wave (SW) frequency bands (150kHz to 30MHz) that are usually
used for AM as well as for DRM transmissions, and FM means any of the world wide used frequency bands for FM radio
broadcast (70MHz to 110MHz).
Two separate amplifier chains are used for AM and FM due to the different operation frequencies and requirements in the AM
and FM band. This allows the use of separate antennas (e.g., windscreen antennas) for AM and FM. Of course, both amplifier
chain inputs can also be connected to one antenna (e.g., roof antenna).
The AM amplifier chain is separated into two amplifiers. The first one is an LNA that is optimized for low noise figure and low
input capacitance. The second amplifier (AM buffer) is optimized to drive a possibly long antenna cable with high parasitic
capacitance. Both amplifiers have outstanding large signal performance. All input and output terminals of these two amplifiers
are accessible from outside so they can be connected together according to the application needs. Additionally, a filter can be
inserted between LNA output and buffer amplifier input.
For AM and FM amplifier chain, two separate automatic gain control (AGC) circuits have been integrated in order to avoid
overdriving the amplifiers in large signal conditions. The two separate AGC loops prevent strong AM signals from blocking FM
stations and vice versa.
The integrated PIN diode drivers reduce the external component cost and board space.
A voltage regulation stage is integrated in order to further reduce the external component costs. This stage provides
overvoltage protection and current limitation. An external transistor is used as power driver for this stage.
3.1
AM Amplifier
Due to the long wavelength in AM bands, the antennas used for AM reception in automotive applications are 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 ATR4252C provides two AM amplifiers, one LNA and one AM buffer amplifier. These
two amplifiers can be used independently because all input/output terminals and bias inputs are externally accessible for the
application.
The AM LNA has low input capacitance (12pF typically) to reduce the capacitive load at the antenna and provides a voltage
gain of typically 9dB that can be varied from 0 to 15dB depending on external application.
The AM buffer amplifier has a very low input capacitance of typically 2.45pF and can also be connected directly to the car
antenna if no additional gain is required. Due to the low output impedance of 8Ω, the buffer amplifier is perfectly suited to drive
the capacitive load of long antenna cables. The voltage gain of this amplifier is close to 1 (0dB), but the insertion gain that is
achieved when the buffer amplifier is inserted between antenna output and antenna cable may be much higher (up to 35dB).
The actual value, of course, depends on antenna and cable capacitances.
The input of the buffer amplifier is connected by an external 4.7MΩ resistor to the bias voltage in order to maintain 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 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.
Atmel ATR4252C [DATASHEET]
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9264B–AUDR–01/14
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
signal sources, e.g., transmitters.
The AM amplifier output AMOUT is applied to a resistive voltage divider. This divided signal feeds the AGC level detector input
pin AMDET. The rectified signal is compared against an internal reference. The threshold of the AGC can be adjusted by
modification of the divider ratio of the external voltage divider. If the threshold is reached ,the pin AMPD opens an internal
transistor, which controls the pin diode current and limits the antenna signal to prevent an overdriving of the AM amplifier.
As the AM AGC has to react very slowly, large capacitors are usually needed for this time delay. To reduce the cost of the
external components, a current control for the time delay is integrated, so that only small external capacitor values are needed.
The necessary driver for the external pin diode is already incorporated in the Atmel® ATR4252C IC, which reduces the BOM
cost and the application size.
3.3
FM Amplifier
The FM amplifier is realized with a high performance single NPN transistor. This allows the use of an amplifier configuration,
which is optimized for the desired requirements. For low cost application, the common emitter configuration provides good
performance at reasonable BOM cost. For high end application, common base configuration with lossless transformer feedback
provides high IP3 and low noise figure at reasonable current consumption. In both configurations, gain, input and output
impedance can be adjusted by modification of external components.
The temperature compensated bias voltage (FMBIAS) for the base of the NPN transistor is derived from an integrated voltage
reference. The bias current of the FM amplifier is defined by an external resistor.
3.4
FM AGC
The IC is equipped with an AGC capability to prevent overdriving of the amplifier in case the amplifier is operated at strong
antenna signals, e.g., near transmitters. It is possible to realize an additional antenna amplifier path with integrated AGC and
external RF transistor. The bandwidth of the integrated AGC circuit is 900MHz.
FM amplifier output FMC is connected to a capacitive voltage divider and the divided signal is applied to the AGC level detector
at pin FMDET. 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 tuning the divider ratio of the external voltage divider. If the threshold is
reached, pin FMPD opens an internal transistor, which controls the pin-diode current. By these means, the amplifier input signal
is limited and therefore the FM amplifier is prevented from signal overdrive.
The necessary driver for the external pin diode is already incorporated in the Atmel ATR4252C IC, which reduces the BOM cost
and the application size.
3.5
3.6
Supply Voltage Regulator
The driving voltage for an external power transistor is provided by an integrated regulator circuit.
An overvoltage protection circuit recognizes overvoltage condition and switches off the amplifier and AGC circuits in order to
reduce current consumption and avoid thermal overload.
Antenna Sensor
In addition, an antenna sensor has been integrated in order to recognize if the antenna is properly connected to the amplifier
module. If no antenna is detected, the amplifier and AGC circuits are switched off in order to signal this error via reduction of
supply current consumption to the unit that provides and monitors the supply current for the antenna amplifier (e.g., the car
radio).
Atmel ATR4252C [DATASHEET]
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9264B–AUDR–01/14
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.
Parameters
Pin
Symbol
Min.
Max.
Unit
Supply voltage
11
VS
–0.3
+12
V
ANTENNA
SENSE
Antenna sense current
1
–500
+500
µA
Comparator input current
Overvoltage detector
Collector of FM amplifier
AM LNA input terminal
AM LNA output terminal
Power dissipation
3
VSTART
OVDET
FMC
0
–0.3
3
2
mA
V
4
+3.3
16
14
23
26
V
AM LNA IN
AM LNA OUT
Ptot
0
2
V
7
12
V
1200
150
+105
+150
+2
mW
°C
°C
°C
kV
Junction temperature
Ambient temperature
Storage temperature
ESD HBM
Tj
Tamb
–40
–50
–2
Tstg
all
VHBM
5.
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient, soldered on PCB, dependent on PCB layout
RthJA
40
K/W
6.
Operating Range
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
10
Max.
Unit
Supply voltage
Supply voltage
Normal operation
11
Vs
7.5
11
V
No malfunction,
performance may be
reduced
11
Vs
7
11
V
Atmel ATR4252C [DATASHEET]
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9264B–AUDR–01/14
7.
Electrical Characteristics
See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
VS, FMC,
AM LNA OUT
AGC OFF
Is
77
mA
B
VS, FMC,
AM LNA OUT
FMAGC ON
Is
Is
85
20
12
95
25
mA
mA
mA
mA
V
B
A
A
C
A
B
Antenna sense error
detected
VS, FMC,
AM LNA OUT
1.1 Supply current
15
VS, FMC,
AM LNA OUT
Over voltage
Is
14.9
99
Tamb = –40 to +105°C;
FMAGC ON
VS, FMC,
AM LNA OUT
Is
Reference voltage
output
1.2
Includes an Ube-Drift
FM BIAS
FM BIAS
VFMBIAS
IFMBIAS
2.2
0
2.7
3.2
3
Output current of
1.3
mA
reference voltage
1.4
AM BIAS
REF
VAMBIAS
VREF
0.32 Vs
V
V
V
A
A
A
Reference voltage
output
1.5
1kΩ load resistor
5.7
6
6.3
40
1.6
AM LNA BIAS
VAMLNABIAS
2.8
2
AM LNA+ Buffer(2)
2.1 Input capacitance
f = 1MHz
AM LNA IN
AM LNA IN
CAMLNAIN
IAMLNAIN
12
pF
nA
C
C
2.2 Input leakage current Tamb = 105°C
Supply current AM-
LNA
2.3
AM LNA OUT
AM/FM-OUT
IAMLNAOUT
18
9
mA
dB
A
B
2.4 Voltage gain
f = 1 MHz
Buffer OUT,
RBIAS = 4.7MΩ, B = 9kHz,
f = 500kHz,
Antenna
Dummy
Input
2.5 Input noise voltage
VN1
VN2
–9
dBµV
dBµV
C
C
f = 1MHz
–12
Maximum operating
frequency
2.7
3dB corner
AM/FM-OUT
30
MHz
C
AM/FM Out;
finp = 1MHz + 1.1MHz,
Vout = 110dBµV,
1K II 500pF load,
Vs = 10V
2.8 OIP3(1)
144
140
dBµV
dBµV
C
C
Vs = 7.5V
AM/FM Out;
finp = 1MHz + 1.1MHz,
Vout = 110dBµV,
1K II 500pF load,
Vs = 10V
2.9 OIP2(1)
170
157
dBµV
dBµV
C
C
Vs = 7.5V
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. AGC Loop deactivated (PIN Diode removed)
2. Measured with antenna dummy (see Figure 8-3 on page 14).
3. Current defined by R17 = 56Ω
Atmel ATR4252C [DATASHEET]
8
9264B–AUDR–01/14
7.
Electrical Characteristics (Continued)
See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
3
AM Buffer Amplifier (2)
3.1 Input capacitance
f = 1MHz
AM BUF IN
AM BUF IN
AM OUT
CAMIN
2.2
2.45
2.7
40
pF
nA
Ω
C
C
C
A
3.2 Input leakage current Tamb = 85°C
3.3 Output resistance
ROUT
6
8
10
3.4 Voltage gain
f = 1MHz
0.85
0.90
0.96
AMOUT,
RBIA S = 4.7MΩ,
B = 9kHz,
3.5 Output noise voltage 150kHz
AM OUT
VNOISE
–8
–9
–11
–12
–6
–7
–9
dBµV
d B µ V
dBµV
dBµV
200kHz
500kHz
1MHz
C
–10
AM/FM Out;
inp = 1MHz + 1.1MHz,
f
Vout = 110dBµV,
1K II 500pF load,
Vs = 10V
3.6 OIP3(1)
145
142
dBµV
dBµV
C
C
Vs = 7.5V
AM/FM Out;
finp = 1MHz + 1.1MHz,
Vout = 110dBµV,
1K II 500pF load,
Vs = 10V
3.7 OIP2(1)
173
162
dBµV
dBµV
C
C
Vs = 7.5V
Maximum operating
frequency
3.8
4
0.5dB corner
AM OUT
30
MHz
C
AM AGC
4.1 Input resistance
4.2 Input capacitance
AM DET
AM DET
RAMDET
CAMDET
40
50
kΩ
A
C
f = 1MHz
f = 1MHz
2.6
3.2
3.8
92
pF
AGC input voltage
threshold
4.3
AM DET
AM PD
VAMth
86
30
89
dBµV
MHz
B
C
AGC threshold increased
by 3dB
4.4 3dB corner frequency
4.5 Saturation voltage
4.6 Leakage current
10mA
AM PD
AM PD
VS – 1.9
V
B
B
4
µA
Maximum PIN Diode
current
4.7
AGC active
AM PD
AM PD
22
35
–1.7
60
mA
µA
A
A
B
C
Maximum AGC sink
current
4.8
V(AMTC1) = 2V Rfoff
diamtc1 / duamdet
IAMsink
–2.0
–1.4
Transconductance of
level detector
am det,
am tc1
µA
----------
4.9
diamtc / duamdet
Vrms
IP3 at level detector 1MHz + 1.1MHz,
input
4.10
AM DET
150
170
dBµV
120dBµV
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. AGC Loop deactivated (PIN Diode removed)
2. Measured with antenna dummy (see Figure 8-3 on page 14).
3. Current defined by R17 = 56Ω
Atmel ATR4252C [DATASHEET]
9
9264B–AUDR–01/14
7.
Electrical Characteristics (Continued)
See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
5
FM Amplifier (see Figure 8-1 on page 12)
5.1 Emitter voltage
5.2 Emitter voltage
5.3 Supply current
5.4 Supply current (3)
T = 25°C
FME
FME
FMC
FMC
1.85
1.7
1.95
2.3
2.3
V
V
A
C
B
A
T = –40°C to +105°C
Common base
Common emitter
IFMC
IFMC
29
35
mA
mA
Maximum output
voltage
5.5
Vs = 10V
FMC
12
Vpp
Ω
C
C
C
C
5.6 Input resistance
f = 100MHz
FM IN
RFMIN
50
Maximum operating 3dB corner,
frequency
5.7
FM OUT
FM OUT
450
MHz
Ω
common emitter
5.8 Output resistance
5.9 Power gain
f = 100MHz
RFMOUT
G
50
f = 100MHz,
common base circuit (see
Figure 8-2 on page 13)
5.2
dB
C
5.10 OIP3 at FMOUT
5.11 NF
Common base circuit
Common base circuit
FM OUT
145
1.9
dBµV
dB
C
C
f = 100MHz, common
emitter circuit (see Figure
8-1 on page 12)
5.12 Power gain
G
13.5
dB
B
5.13 OIP3 at FMOUT
5.14 NF
Common emitter circuit
Common emitter circuit
FM OUT
FM OUT
140
3.5
dBµV
dB
B
C
6
FM AGC
AGC input voltage
threshold
FM range: f = 100MHz
Extended: f = 900MHz
Vth1,100
Vthl,900
83
81
85
85
87
89
dBµV
dBµV
B
C
6.1
FM DET
6.2 Saturation voltage
6.3 Leakage current
10mA
FMPD
FMPD
VS – 1.9
V
B
B
1
µA
Maximum PIN Diode
current
6.4
AGC active
f = 100MHz
FMPD
12
14
mA
A
6.5 Input resistance
6.6 Input capacitance
FM DET
FM DET
RFMDET
CFMDET
17
21
25
kΩ
C
C
1.5
1.75
2.0
pF
100MHz + 105MHz,
VFMDET = 120dBµV
6.7 IP3 Pin 13 FM
FM DET
150
–9
dBµV
C
C
B
6.8 Current Pin FMTC
6.9 Transconductance
RFoff
FMTC
IFMTC
–13
–7.2
0.8
µA
FMTC
FM DET
dIFMTC
dUFMDET
/
mA/V
(rms)
dIFMTC / dUFMDET
0.35
0.5
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. AGC Loop deactivated (PIN Diode removed)
2. Measured with antenna dummy (see Figure 8-3 on page 14).
3. Current defined by R17 = 56Ω
Atmel ATR4252C [DATASHEET]
10
9264B–AUDR–01/14
7.
Electrical Characteristics (Continued)
See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
7
Voltage Regulator / Monitor
Output voltage of
regulator
Battery voltage
VB = 14V
7.1
VS
VB, AM/FM-Out
OVDET
9.5
40
10
50
10.5
V
dB
V
A
C
A
C
Ripple rejection of
regulator
7.2
7.3
100Hz, VB > VS + 1V
Threshold for over-
voltage detection
1.6
1.8
Hysteresis of over
voltage detection
7.4
8
OVDET
4
%
Antenna Sensor
Antenna monitor
range
Rsense = 22kΩ,
antenna detected
8.1
ANT SENS
0 to 3
6 to 16
V
C
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. AGC Loop deactivated (PIN Diode removed)
2. Measured with antenna dummy (see Figure 8-3 on page 14).
3. Current defined by R17 = 56Ω
Atmel ATR4252C [DATASHEET]
11
9264B–AUDR–01/14
8.
Test Circuits
Figure 8-1. Common Emitter Configuration
AMIN
L5
3.3µH
C24
C20
R14
10kΩ
R24
R13
0Ω
15Ω
470pF
220nF
BA779-2
C18
C16
100nF
2.2nF
C15
R12
10kΩ
R17
R20
1.8kΩ
C23
C22
10nF
56Ω
R15
2.2nF
220nF
R19
+VS
1kΩ
L2
R25
39kΩ
C21
220nF
D1
C5
4.7MΩ
FMIN
2.2nF
C4
2.2nF
1SV262
R22
0Ω
C13
C14
2.2nF
C30
220nF
R21
180Ω
22 21 20 19 18 17 16 15
R11
2.2pF
23
24
25
26
27
28
14
13
12
11
10
9
AM/FM_OUT
C19
560Ω
R10
R16
220Ω
L4
C12
100Ω
1.2pF
C9
33pF
L1
120nH
ATR4252
C25
220nF
100nF
C31 1nF
C10
L3
470nH
R9
220nF
C27
33Ω
470 nF
C28
2.2nF
R27
4.7MΩ
1
2
3
4
5
6
7
8
R23
0Ω
R8
3.3kΩ
slug
R18
470Ω
R4
R1
R2
C26
C8 10nF
C2
C6 C7
220nF
R7
560Ω
2
1
R3
Jumper2
J1
C29
220nF
R5
22kΩ
R26
10Ω
R28
R6
4.7Ω
VB
GND
+VS
T1
2SB1122
0Ω
C1
C11
+
10µF
100nF
Atmel ATR4252C [DATASHEET]
12
9264B–AUDR–01/14
Figure 8-2. Common Base Configuration
AMIN
L5
3.3µH
C24
C20
C17
22pF
R13
nc
R14
10kΩ
470pF
220nF
BA779-2
C16
nc
L6
nc
C15
L2
R12
10kΩ
R20
1.8kΩ
R17
10nF
C23
C22
120nH
R15
68Ω
C32
100nF
2.2nF
220nF
120nH
R19
1kΩ
+VS
R25
D1
C21
L7
1
C5A
C5B
2.2nF
C18
1nF
39kΩ
4.7MΩ
FMIN
220nF
2.2nF
C4
3
4
T3
6
2.2nF
R22
C13
1SV264
C30
R24
R21
180Ω
0Ω
220nF
22 21 20 19 18 17 16 15
10Ω
C3
2.2nF
C9A
27pF
R11
1kΩ
2.2pF
C14
1pF
23
24
25
26
27
28
14
AM/FM_OUT
C9C
nc
C9D
nc
C9E
C19
R10
R16
R29
220Ω
C25
nc
13
12
11
10
9
6
4
3
C12
100Ω
L1
120nH
nc
L10
nc
1.2pF
220nF
T2
C9B
15pF
ATR4252
L8
nc
L9
nc
100nF
1
C31 1 nF
R9
220nF
C27
L3
470nH
R9
33Ω
C10
C28
470nF
2.2nF
R27
4.7MΩ
1
2
3
4
5
6
7
8
R23
0Ω
R8
3.3kΩ
slug
R4
R18
470Ω
R1
R2
C8 10nF
C2
C6 C7
C26
R7
560Ω
220nF
2
1
R3
Jumper2
J1
C29
R5
22kΩ
R26
+
10Ω
R6
220nF
R28
VB
+VS
T1
2SB1122
0Ω
4.7W
C1
C11
100nF
+
GND
10µF
Atmel ATR4252C [DATASHEET]
13
9264B–AUDR–01/14
Figure 8-3. Antenna Dummy for Test Purposes
Antenna
Dummy
Input
Capacitor
(Representing
Antenna
Connect directly
to Amplifier
(no Cable!)
Capacitance)
56pF
50Ω
Signal Source
Termination
Coaxial
Connector
(50Ω)
Figure 8-4. Recommended Footprint
0.3
0.5
PIN 1
2.7
4.4
Atmel ATR4252C [DATASHEET]
14
9264B–AUDR–01/14
9.
Internal Cicuitry
Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown)
Pin
Symbol
Function
1
1
ANTENNA SENSE
2, 13
2, 13
VSFILTER; FMDET
3
3
VSTART
4
4
5
OVDET
VREGO
5
6, 12
6, 12
AMTC1; FMTC
Atmel ATR4252C [DATASHEET]
15
9264B–AUDR–01/14
Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown) (Continued)
Pin
Symbol
Function
7
AMTC2
7
8
8
AMDET
9, 19
9, 19
GND1, GND2
10
10
AMOUT
11
VS
11
VS
14, 26
14, 26
FMC, AMLNAOUT
15, 20
16, 18
FMPD, AMPD
FME, FMBIAS
15, 20
16, 18
Atmel ATR4252C [DATASHEET]
16
9264B–AUDR–01/14
Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown) (Continued)
Pin
Symbol
Function
17
17
FMB
21
REF
21
22, 27
22, 27
AMLNABIAS; AMBIAS
AMLNAIN, AMLNASOURCE,
AMBUFIN
23, 24, 28
23, 24, 28
25
CASCODEFILTER
25
Atmel ATR4252C [DATASHEET]
17
9264B–AUDR–01/14
10. Ordering Information
Extended Type Number
ATR4252C-RAPW
Package
Remarks
VQFN 4x5 / 28L
VQFN 4x5 / 28L
Taped on reel, 1.5k volume
Taped on reel, 6k volume
ATR4252C-RAQW
11. Package Information
Top View
D
28
1
PIN 1 ID
technical drawings
according to DIN
specifications
8
Dimensions in mm
Side View
Bottom View
D2
9
14
15
22
8
1
COMMON DIMENSIONS
(Unit of Measure = mm)
Symbol MIN
NOM
0.85
0.035
0.21
4
MAX NOTE
A
A1
A3
D
0.8
0.9
0.05
0.26
4.1
0
0.16
3.9
2.5
4.9
3.5
0.35
0.2
28
23
Z
e
D2
E
2.6
2.7
5
5.1
E2
L
3.6
3.7
Z 10:1
0.4
0.45
0.3
b
e
0.25
0.5
b
10/18/13
TITLE
DRAWING NO.
REV.
GPC
Package Drawing Contact:
packagedrawings@atmel.com
Package: VQFN_4x5_28L
Exposed pad 2.6x3.6
6.543-5143.02-4
1
Atmel ATR4252C [DATASHEET]
18
9264B–AUDR–01/14
12. 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.
9264B-AUDR-01/14
History
• Section 11 “Package Information” on page 18 updated
Atmel ATR4252C [DATASHEET]
19
9264B–AUDR–01/14
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