ATR4252C - Complete

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
9264D-AUDR-11/14
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 preintegrated 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 IN
23
AM LNA
SOURCE
24
AM LNA
BIAS
REF
AMPD
GND2
FM
BIAS
FMB
FME
FMPD
22
21
20
19
18
17
16
15
FM
Amplifier
AM
LNA
14
FMC
13
FMDET
CASCODE
25
FILTER
12
FMTC
AM LNA OUT
26
11
VS
AMBIAS
27
10
AMOUT
AMBUF IN
28
9
GND1
AGC
(FM)
Voltage
Supply
Antenna
Detect
Over
Voltage
AGC
(AM)
AM
Buffer
1
2
3
4
5
6
7
8
ANTENNA
VS VSTART OVDET VREGO AMTC1 AMTC2 AMDET
SENSE FILTER
2
ATR4252C [DATASHEET]
9264D–AUDR–11/14
Pin Configuration
Table 2-1.
AM LNABIAS
REF
AMPD
GND2
FMBIAS
FMB
FME
FMPD
Figure 2-1. Pinning VQFN 4x5 / 28L
22
21
20
19
18
17
16
15
AM LNA IN
23
14
FMC
AM LNA SOURCE
24
13
FMDET
CASCODE FILTER
25
12
FMTC
11
VS
AMOUT
ATR4252
9
1
2
3
4
5
6
7
8
AMDET
28
AMTC2
AMBUF IN
AMTC1
10
VREGO
27
OVDET
AMBIAS
VSTART
26
VS FILTER
AM LNA OUT
ANTENNA SENSE
2.
GND1
Pin Description
Pin
Symbol
1
ANTENNA SENSE
Function
2
VS FILTER
3
VSTART
Comparator input of voltage detector
4
OVDET
Overvoltage detection input
5
VREGO
Output of voltage regulator
6
AMTC1
AM AGC time-constant capacitance 1
7
AMTC2
AM AGC time-constant capacitance 2
8
AMDET
Level detector input of AM-AGC
9
GND1
10
AMOUT
11
VS
Antenna sense input
Supply voltage filter input
Ground AM
AM output, impedance matching
Supply voltage
12
FMTC
13
FMDET
FM AGC time constant
Level detector input of FM-AGC
14
FMC
Collector of FM amplifier (NPN)
15
FMPD
16
FME
FM amplifier emitter (NPN)
17
FMB
FM amplifier base (NPN)
18
FMBIAS
19
GND2
Ground FM
20
AMPD
AM AGC output for pin diode
FM AGC output for pin diode
Reference voltage 2.7V FM
ATR4252C [DATASHEET]
9264D–AUDR–11/14
3
Table 2-1.
Pin Description (Continued)
Pin
4
Symbol
Function
21
REF
22
AM LNA BIAS
23
AM LNA IN
24
AM LNA SOURCE
AM LNA source terminal
25
CASCODE FILTER
AM Cascode filter terminal
26
AM LNA OUT
27
AMBIAS
28
AMBUF IN
Paddle
GND
ATR4252C [DATASHEET]
9264D–AUDR–11/14
Reference voltage 6V
Reference voltage for AM LNA IN
AM LNA input terminal
AM LNA output terminal
Reference voltage for AMBUF IN
AM Buffer amplifier input, impedance matching
Ground paddle
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.
ATR4252C [DATASHEET]
9264D–AUDR–11/14
5
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
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.
3.6
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).
6
ATR4252C [DATASHEET]
9264D–AUDR–11/14
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 current
1
ANTENNA
SENSE
–500
+500
µA
Comparator input current
3
VSTART
0
2
mA
Overvoltage detector
4
OVDET
–0.3
+3.3
V
Collector of FM amplifier
14
FMC
3
16
V
AM LNA input terminal
23
AM LNA IN
0
2
V
AM LNA output terminal
26
AM LNA OUT
7
12
V
Power dissipation
Ptot
1200
mW
Junction temperature
Tj
150
°C
Ambient temperature
Tamb
–40
+105
°C
Storage temperature
Tstg
–50
+150
°C
VHBM
–2
+2
kV
Symbol
Value
Unit
RthJA
40
K/W
ESD HBM
5.
all
Thermal Resistance
Parameters
Junction ambient, soldered on PCB, dependent on PCB layout
6.
Operating Range
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
Normal operation
11
Vs
7.5
10
11
V
Supply voltage
No malfunction,
performance may be
reduced
11
Vs
7
11
V
ATR4252C [DATASHEET]
9264D–AUDR–11/14
7
7.
Electrical Characteristics
See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified
No.
1.1
Parameters
Supply current
1.2
Reference voltage
output
1.3
Output current of
reference voltage
1.4
1.5
1.6
Reference voltage
output
Test Conditions
Pin
Symbol
AGC OFF
VS, FMC,
AM LNA OUT
Is
77
FMAGC ON
VS, FMC,
AM LNA OUT
Is
85
Antenna sense error
detected
VS, FMC,
AM LNA OUT
Is
Over voltage
VS, FMC,
AM LNA OUT
Is
Tamb = –40 to +105°C;
FMAGC ON
VS, FMC,
AM LNA OUT
Is
FM BIAS
VFMBIAS
2.2
FM BIAS
IFMBIAS
0
AM BIAS
VAMBIAS
REF
VREF
AM LNA BIAS
VAMLNABIAS
2.8
AM LNA IN
CAMLNAIN
12
AM LNA IN
IAMLNAIN
AM LNA OUT
IAMLNAOUT
Includes an Ube-Drift
1kΩ load resistor
2
AM LNA+ Buffer(2)
2.1
Input capacitance
2.2
Input leakage current Tamb = 105°C
2.3
Supply current AMLNA
2.4
Voltage gain
f = 1 MHz
Input noise voltage
Buffer OUT,
RBIAS = 4.7MΩ, B = 9kHz,
f = 500kHz,
2.5
f = 1MHz
2.8
2.9
Maximum operating
frequency
OIP3(1)
OIP2(1)
3dB corner
15
Antenna
Dummy
Input
AM/FM-OUT
Typ.
Unit
Type*
mA
B
95
mA
B
20
25
mA
A
12
14.9
mA
A
99
mA
C
3.2
V
A
3
mA
B
V
A
V
A
V
A
2.7
Max.
0.32 Vs
5.7
6
6.3
pF
C
nA
C
18
mA
A
9
dB
B
VN1
–9
dBµV
C
VN2
–12
dBµV
C
MHz
C
40
AM/FM-OUT
f = 1MHz
2.7
Min.
30
AM/FM Out;
finp = 1MHz + 1.1MHz,
Vout = 110dBµV,
1K II 500pF load,
Vs = 10V
144
dBµV
C
Vs = 7.5V
140
dBµV
C
AM/FM Out;
finp = 1MHz + 1.1MHz,
Vout = 110dBµV,
1K II 500pF load,
Vs = 10V
170
dBµV
C
Vs = 7.5V
157
dBµV
C
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
8
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
ATR4252C [DATASHEET]
9264D–AUDR–11/14
7.
Electrical Characteristics (Continued)
See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified
No.
3
Parameters
Test Conditions
3.1
Input capacitance
3.2
Input leakage current Tamb = 85°C
3.3
Output resistance
3.4
Voltage gain
3.5
AMOUT,
RBIA S = 4.7MΩ,
B = 9kHz,
Output noise voltage 150kHz
200kHz
500kHz
1MHz
3.6
3.7
3.8
4
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
AM BUF IN
CAMIN
2.2
2.45
2.7
pF
C
40
nA
C
Ω
C
AM Buffer Amplifier (2)
OIP3(1)
OIP2(1)
Maximum operating
frequency
f = 1MHz
AM BUF IN
AM OUT
ROUT
f = 1MHz
AM OUT
6
8
10
0.85
0.90
0.96
–8
–9
–11
–12
–6
–7
–9
–10
VNOISE
A
dBµV
dBµV
dBµV
dBµV
C
AM/FM Out;
finp = 1MHz + 1.1MHz,
Vout = 110dBµV,
1K II 500pF load,
Vs = 10V
145
dBµV
C
Vs = 7.5V
142
dBµV
C
AM/FM Out;
finp = 1MHz + 1.1MHz,
Vout = 110dBµV,
1K II 500pF load,
Vs = 10V
173
dBµV
C
Vs = 7.5V
162
dBµV
C
MHz
C
0.5dB corner
AM OUT
30
AM AGC
4.1
Input resistance
AM DET
RAMDET
40
50
kΩ
A
4.2
Input capacitance
f = 1MHz
AM DET
CAMDET
2.6
3.2
3.8
pF
C
4.3
AGC input voltage
threshold
f = 1MHz
AM DET
VAMth
86
89
92
dBµV
B
4.4
3dB corner frequency
AGC threshold increased
by 3dB
AM PD
MHz
C
4.5
Saturation voltage
10mA
AM PD
V
B
4.6
Leakage current
AM PD
µA
B
4.7
Maximum PIN Diode
AGC active
current
AM PD
mA
A
4.8
Maximum AGC sink
current
AM PD
IAMsink
µA
A
4.9
Transconductance of
diamtc1 / duamdet
level detector
am det,
am tc1
diamtc /
duamdet
60
µA---------V rms
B
4.10
IP3 at level detector
input
AM DET
170
dBµV
C
V(AMTC1) = 2V Rfoff
1MHz + 1.1MHz,
120dBµV
30
VS – 1.9
4
22
35
–2.0
–1.7
150
–1.4
*) 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
ATR4252C [DATASHEET]
9264D–AUDR–11/14
9
7.
Electrical Characteristics (Continued)
See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified
No.
5
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
1.95
2.3
V
A
2.3
V
C
FM Amplifier (see Figure 8-1 on page 12)
5.1
Emitter voltage
T = 25°C
FME
1.85
5.2
Emitter voltage
T = –40°C to +105°C
FME
1.7
5.3
Supply current
Common base
FMC
IFMC
29
mA
B
5.4
Supply current (3)
Common emitter
FMC
IFMC
35
mA
A
5.5
Maximum output
voltage
Vs = 10V
FMC
Vpp
C
5.6
Input resistance
f = 100MHz
FM IN
Ω
C
5.7
Maximum operating
frequency
3dB corner,
common emitter
FM OUT
MHz
C
5.8
Output resistance
f = 100MHz
FM OUT
Power gain
f = 100MHz,
common base circuit (see
Figure 8-2 on page 13)
5.9
12
RFMIN
50
450
RFMOUT
50
Ω
C
G
5.2
dB
C
145
dBµV
C
1.9
dB
C
13.5
dB
B
5.10 OIP3 at FMOUT
Common base circuit
5.11 NF
Common base circuit
5.12 Power gain
f = 100MHz, common
emitter circuit (see Figure
8-1 on page 12)
5.13 OIP3 at FMOUT
Common emitter circuit
FM OUT
140
dBµV
B
5.14 NF
Common emitter circuit
FM OUT
3.5
dB
C
FM DET
dBµV
dBµV
B
C
V
B
µA
B
mA
A
6
FM OUT
G
FM AGC
6.1
AGC input voltage
threshold
FM range: f = 100MHz
Extended: f = 900MHz
6.2
Saturation voltage
10mA
6.3
Leakage current
FMPD
6.4
Maximum PIN Diode
AGC active
current
FMPD
6.5
Input resistance
6.6
Input capacitance
6.7
6.8
6.9
Vth1,100
Vthl,900
83
81
FMPD
85
85
87
89
VS – 1.9
1
12
14
FM DET
RFMDET
17
21
25
kΩ
C
f = 100MHz
FM DET
CFMDET
1.5
1.75
2.0
pF
C
IP3 Pin 13 FM
100MHz + 105MHz,
VFMDET = 120dBµV
FM DET
dBµV
C
Current Pin FMTC
RFoff
–7.2
µA
C
0.8
mA/V
(rms)
B
Transconductance
dIFMTC / dUFMDET
150
FMTC
IFMTC
FMTC
FM DET
dIFMTC /
dUFMDET
–13
0.35
–9
0.5
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
10
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
ATR4252C [DATASHEET]
9264D–AUDR–11/14
7.
Electrical Characteristics (Continued)
See test circuit Figure 8-2 on page 13, VS = 10V, Tamb = 25°C, unless otherwise specified
No.
7
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
VS
9.5
10
10.5
V
A
VB, AM/FM-Out
40
50
dB
C
1.6
V
A
%
C
V
C
Voltage Regulator / Monitor
7.1
Output voltage of
regulator
Battery voltage
VB = 14V
7.2
Ripple rejection of
regulator
100Hz, VB > VS + 1V
7.3
Threshold for overvoltage detection
OVDET
7.4
Hysteresis of over
voltage detection
OVDET
8
Antenna Sensor
8.1
Antenna monitor
range
Rsense = 22kΩ,
antenna detected
ANT SENS
1.8
4
0 to 3
6 to 16
*) 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
ATR4252C [DATASHEET]
9264D–AUDR–11/14
11
8.
Test Circuits
Figure 8-1. Common Emitter Configuration
AMIN
L5
3.3µH
C20
220nF
C23
2.2nF
+VS
R25
39kΩ
C30
220nF
R24
0Ω
R13
15Ω
C18
C16
100nF
2.2nF
R20
1.8kΩ
C22
220nF
R19
L2
C21
220nF
4.7MΩ
R21
180Ω
R14
10kΩ
C25
220Ω
22
21
20
18
19
17
16
15
13
C19
R10
1.2pF
100Ω
100nF
26
11
27
10
28
9
1
R23
0Ω
2
3
C31
1nF
4
5
6
8
R2
slug
C8
C9
33pF
R9
L3
33Ω
470nH
R8
3.3kΩ
2.7kΩ
2 1
Jumper2
J1
0Ω
GND
ATR4252C [DATASHEET]
R7
560Ω
R3
R5
R26
C29
22kΩ
10Ω
220nF
R28
VB
10nF
C7
100nF
C6
4.7µF
C2
18kΩ
22kΩ
C26
9264D–AUDR–11/14
7
R6
T1
2SB1122
+VS
4.7Ω
+ C1
10µF
C11
100nF
2.2nF
AM/FM_OUT
L1
120nH
C10
FMIN
2.2nF
R4
R1
220nF
C4
560Ω
470 nF
R27
4.7MΩ
R18
470Ω
12
C12
12
ATR4252
R11
2.2pF
14
27 kW
C28
2.2nF
R12
10kΩ
D1
C14
C13
25
220nF
C27
R15
C5
2.2nF
24
220nF
56Ω
1SV262
R22
0Ω
220nF
D52FU
2.2mH
R16
C15
10nF
1kΩ
23
L4
R17
560nH
BA779-2
C24
470pF
Figure 8-2. Common Base Configuration
AMIN
L5
3.3µH
BA779-2
C24
C20
470pF
220nF
C23
2.2nF
+VS
R25
39kΩ
C15
L2
R17
120nH
68Ω
R15
120nH
L7
C18
3
1
4
6
1nF
C30
220nF
R21
180Ω
R22
0Ω
21
20
18
19
17
16
15
220Ω
nc
220nF
C27
26
11
27
10
28
9
1
R23
0Ω
2
3
4
5
C19
R10
1.2pF
100Ω
L1
120nH
100nF
6
7
C31
C14
R11
1pF
1kΩ
D1
C5B
2.2nF
C4
6
8
slug
1SV264
C3
2.2nF
4
C9A
27pF
3
C9B
15pF
T2
1
1 nF
C9C
nc
L8
nc
FMIN
2.2nF
C9D
nc
L9
nc
C9E
AM/FM_OUT
nc
L10
nc
R9
R9
33Ω
C10
470nF
L3
470nH
R8
3.3kΩ
R4
R1
22kΩ
C26
220nF
R2
C2
C8
C6
2 1
Jumper2
J1
22kΩ
R28
0Ω
GND
R7
560Ω
R3
R5
VB
10nF
C7
4.7µF
R18
470Ω
100nF
R27
4.7MΩ
C12
12
ATR4252
2.7kΩ
C28
2.2nF
25
18kΩ
R29
220nF
13
27kΩ
C25
24
R24
10Ω
2.2pF
14
220nF
L4
2.2mH
23
R16
C5A
2.2nF
T3
C13
22
R12
10kΩ
10nF
1kΩ
C21
220nF
4.7MΩ
nc
C32
100nF
220nF
R19
C16
L6
nc
R20
1.8kΩ
C22
C17
22pF
R13
nc
R14
10kΩ
R26
10Ω
C29
+
220nF
R6
T1
2SB1122
+VS
4.7W
+ C1
10µF
C11
100nF
ATR4252C [DATASHEET]
9264D–AUDR–11/14
13
Figure 8-3. Antenna Dummy for Test Purposes
Antenna
Dummy
Input
Capacitor
(Representing
Antenna
Capacitance)
Connect directly
to Amplifier
(no Cable!)
56pF
50Ω
Signal Source
Termination
(50Ω)
Coaxial
Connector
Figure 8-4. Recommended Footprint
0.5
1.0
0.3
2.7
4.4
14
ATR4252C [DATASHEET]
9264D–AUDR–11/14
5.4
3.7
PIN 1
9.
Internal Cicuitry
Table 9-1.
Equivalent Pin Circuits (ESD Protection Circuits not Shown)
Pin
Symbol
1
ANTENNA SENSE
2, 13
VSFILTER; FMDET
Function
1
2, 13
3
3
VSTART
4
OVDET
4
5
5
VREGO
6, 12
AMTC1; FMTC
6, 12
ATR4252C [DATASHEET]
9264D–AUDR–11/14
15
Table 9-1.
Equivalent Pin Circuits (ESD Protection Circuits not Shown) (Continued)
Pin
Symbol
7
AMTC2
Function
7
8
8
AMDET
9, 19
GND1, GND2
10
AMOUT
11
VS
9, 19
10
11
VS
14, 26
14, 26
FMC, AMLNAOUT
15, 20
FMPD, AMPD
15, 20
16
ATR4252C [DATASHEET]
9264D–AUDR–11/14
Table 9-1.
Equivalent Pin Circuits (ESD Protection Circuits not Shown) (Continued)
Pin
Symbol
16, 18
FME, FMBIAS
Function
16, 18
17
FMB
21
REF
17
21
22, 27
AMLNABIAS; AMBIAS
23, 24, 28
AMLNAIN, AMLNASOURCE,
AMBUFIN
25
CASCODEFILTER
22, 27
23, 24, 28
25
ATR4252C [DATASHEET]
9264D–AUDR–11/14
17
10.
Ordering Information
Extended Type Number
Package
Remarks
MOQ
ATR4252C-RAQW-1
VQFN 4x5 / 28L
Taped and reeled
6000 pieces
11.
Package Information
Top View
D
28
1
PIN 1 ID
E
technical drawings
according to DIN
specifications
8
A
Side View
A3
A1
Dimensions in mm
Bottom View
D2
9
14
15
8
COMMON DIMENSIONS
E2
(Unit of Measure = mm)
1
28
23
e
Z 10:1
L
Z
22
Symbol
MIN
NOM
MAX
A
0.8
0.85
0.9
A1
A3
0
0.16
0.035
0.21
0.05
0.26
D
3.9
4
4.1
D2
2.5
2.6
2.7
E
4.9
5
5.1
E2
3.5
3.6
3.7
L
0.35
0.4
0.45
b
e
0.2
0.25
0.5
0.3
NOTE
b
10/18/13
TITLE
Package Drawing Contact:
[email protected]
18
ATR4252C [DATASHEET]
9264D–AUDR–11/14
Package: VQFN_4x5_28L
Exposed pad 2.6x3.6
GPC
DRAWING NO.
REV.
6.543-5143.02-4
1
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.
History
9264D-AUDR-11/14
• Section 10 “Ordering Information” on page 18 updated
9264C-AUDR-08/14
• Section 11 “Package Information” on page 18 updated
9264B-AUDR-01/14
• Section 11 “Package Information” on page 18 updated
ATR4252C [DATASHEET]
9264D–AUDR–11/14
19
XXXXXX
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© 2014 Atmel Corporation. / Rev.: 9264D–AUDR–11/14
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