ATR4253C - Complete

ATR4253C
Integrated Circuit Solution for Active Antennas
DATASHEET
Features
● Highly integrated - All-in-one active antenna IC
● Operating frequency range: 50MHz to 900MHz
● Main application 76MHz to 108MHz (broadcast FM worldwide)
● Integrated AGC
● Integrated driver for PIN diodes
● Integrated power supply regulator
● Integrated antenna sensor
● High dynamic range
● Excellent noise performance
● High intercept point 3rd order
● RF amplifier adjustable to various cable impedances
● Low noise output voltage
● Low power consumption
9265C-AUDR-11/14
1.
Description
The Atmel® ATR4253C is a highly integrated high-performance IC for active antenna amplification. The device has a built-in
AGC, antenna detection, a power supply regulator and two driver stages for external PIN diodes.
The Atmel ATR4253C is based on BICMOS technology. The device is designed in particular for car applications and is
suitable for active antennas located in several positions within the car such as bumpers, windscreen, mirrors or windows.
Figure 1-1. Block Diagram
RFB
RFE
PD2
RFC
12
11
10
9
FM
Amplifier
BIAS
13
GND2
14
REF
15
PD1
16
Voltage
Supply
AGC
(FM)
Antenna
Detection
1
Over
Voltage
2
3
4
ANTENNA VSTART OVDET VREGO
SENSE
2
ATR4253C [DATASHEET]
9265C–AUDR–11/14
8
DET
7
TC
6
VS
5
GND1
Pin Configuration
Table 2-1.
2
OVDET
3
VREGO
4
REF
GND2
BIAS
15
14
13
Atmel
ATR4253C
5
6
7
8
DET
VSTART
16
TC
1
VS
ANT SENSE
PD1
Figure 2-1. Pinning QFN 3x3 / 16 Pins
GND1
2.
12
RFB
11
RFE
10
PD2
9
RFC
Pin Description
Pin
Symbol
Function
1
ANT SENSE
2
VSTART
Comparator input of voltage detector
3
OVDET
Overvoltage detection input
4
VREGO
Voltage regulator output
5
GND1
Ground voltage regulator
6
VS
Supply voltage
7
TC
AGC time constant
8
DET
AGC level detector input
9
RFC
Amplifier collector (NPN)
10
PD2
2nd AGC output for pin diode
Antenna sense input
11
RFE
Amplifier emitter (NPN)
12
RFB
Amplifier base (NPN)
13
BIAS
Bias voltage (2.7V)
14
GND2
Ground FM
15
REF
Reference voltage (6V)
16
PD1
1st FM AGC output for pin diode
Paddle
GND
Ground paddle
ATR4253C [DATASHEET]
9265C–AUDR–11/14
3
3.
Functional Description
The Atmel® ATR4253C is a highly integrated antenna amplifier with a broad range of features and functions. It compensates
cable losses between the antenna and the car radio, which is usually placed far away from the antenna. The device can be
used in the frequency range of 50MHz up to 900MHz (i.e., FM, DAB (+), DMB, DVB-T, ISDB-T, etc.) and has the flexibility to
address different antenna types (e.g., glass, windscreen, roof antennas).
A separate automatic gain control (AGC) function is integrated in order to avoid overdriving the RF amplifier at large signal
conditions.
The integrated PIN diode drivers help to reduce the external component cost and to minimize the board space.
The external component cost can be further reduced as the voltage regulation stage is also integrated. This stage provides
overvoltage protection and current limitation. An external transistor is used as power driver for this stage.
3.1
RF Amplifier Stage
The RF amplifier is realized with a high-performance NPN transistor. This allows the use of an amplifier configuration which
is optimized for the individual application requirements. For low-cost applications, the common emitter configuration enables
good performance at reasonable BOM cost. For high-end applications, a common base configuration with transformer
feedback provides high IP3 and low noise figures at reasonable current consumption. In both configurations, gain, input and
output impedance can be adjusted by modifying the external components.
The bias voltage (BIAS) for the base of the NPN transistor is derived from an integrated voltage reference and has a PTAT
(proportional to absolute temperature) behavior. The bias current of the RF amplifier is defined by an external resistor and is
kept constant over temperature.
3.2
AGC
The IC is equipped with an AGC functionality to prevent overdriving 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.
The amplifier output (RFC) is connected to a capacitive voltage divider and the divided signal is applied to the AGC level
detector at pin DET. This level detector input is optimized for low distortion. The rectified signal is compared against an
internal reference. The divider ratio of the external voltage divider defines the AGC’s threshold. If the threshold is reached,
pin PD1 drives a positive current through one or two external pin diodes in shunt configuration. In case the limiting range of
the shunt configuration is not sufficient an additional pin diode in serial configuration can be added and controlled via pin
PD2. The current from PD2 through the serial pin diode is opposite to the current of PD1. This helps to limit the amplifier
input signal and thus to prevent the FM amplifier from signal overdrive.
The drivers required for the external pin diode(s) are built-in into the Atmel ATR4253C IC, which reduces the BOM cost and
the application size.
3.3
Supply Voltage Regulator
The driving voltage for an external power transistor is provided by an integrated regulator circuit.
An overvoltage protection circuit detects overvoltage condition and switches off the amplifier and AGC circuit in order to
reduce current consumption and avoid thermal overload.
3.4
Antenna Sensor
The Atmel ATR4253C provides a built-in antenna sensor that detects if the antenna is properly connected to the amplifier
module. If no antenna is detected, the amplifier and AGC circuit are switched off to signal this error via supply current
reduction to the unit that provides and monitors the supply current for the antenna amplifier (e.g., the car radio).
4
ATR4253C [DATASHEET]
9265C–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.
Parameters
Pin
Symbol
Min.
Max.
Unit
Supply voltage
6
VS
–0.3
+12
V
Antenna sense current
1
ANT SENSE
–500
+500
µA
Comparator input current
2
VSTART
0
2
mA
Overvoltage detector
3
OVDET
–0.3
+3.3
V
Collector of FM amplifier
9
RFC
3
16
V
Power dissipation
Ptot
700
mW
Junction temperature
Tj
150
°C
Ambient temperature
Tamb
–40
+115
°C
Storage temperature
Tstg
–50
+150
°C
VHBM
–2
+2
kV
ESD HBM
5.
All
Thermal Resistance
Parameters
Junction ambient, soldered on PCB, dependent on PCB layout
6.
Symbol
Value
Unit
RthJA
40
K/W
Operating Range
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
Normal operation
6
VS
7.5
10
11
V
Supply voltage
Performance may be reduced,
no malfunction
6
VS
7
11
V
FM emitter current
Thermal condition
11
IRFE
35
mA
ATR4253C [DATASHEET]
9265C–AUDR–11/14
5
7.
Electrical Characteristics
See test circuit (Figure 8-2 on page 9), VS = 10V, Tamb = 25°C, unless otherwise specified.
No.
1.1
Parameters
Supply current
Test Conditions
Pin
Symbol
Unit
Type*
AGC OFF
VS
Is
12
mA
B
AGC ON, includes 7mA
pin diode current
VS
Is
19
mA
B
Antenna sense error
detected
VS
Is
Over voltage
VS
Tamb = –40 to +115°C;
AGC ON; includes 7mA
pin diode current and
31mA RF current
Min.
15
Typ.
Max.
20
25
mA
A
Is
10
14.9
mA
A
VS, RFC
Is, IRFC
50
70
mA
C
2.8
3.1
V
A
3
mA
B
A
1.2
Bias voltage output
BIAS
VBIAS
2.5
1.3
Output current of
bias voltage
BIAS
IBIAS
0
1.5
Bias voltage output
1kΩ output resistor
REF
VREF
5.7
6
6.3
V
2
RF Amplifier
2.1
Emitter voltage
T = 25°C
RFE
2.0
2.1
2.2
V
A
2.2
Emitter voltage
T = –40°C to +115°C
RFE
1.9
2.1
2.3
V
C
2.3
Supply current(1)
Common base
RFC
IRFC
31
mA
B
2.4
Supply current
(2)
Common emitter
RFC
IRFC
35
mA
A
2.5
Maximum output
voltage
Vs = 10V
RFC
Vpp
C
2.6
Input resistance
f = 100MHz
RF IN
RFMIN
50
Ω
C
2.7
Output resistance
f = 100MHz
RF OUT
RFMOUT
50
Ω
C
2.8
Power gain
f = 100MHz
RF IN, RF OUT
G
5.2
dB
C
2.9
OIP3 at FMOUT
Common base
RF OUT
146
dBµV
C
2.10 NF
Common base
RF OUT
1.6
dB
C
2.11 Power gain
f = 100MHz, common
emitter
RF OUT
13.5
dB
B
2.12 OIP3 at FMOUT
Common emitter
RF OUT
140
dBµV
B
2.13 NF
Common emitter
RF OUT
3.5
dB
C
3dB corner, common
emitter
RF OUT
MHz
C
87
89
dBµV
dBµV
B
C
V
B
1
µA
B
mA
D
mA
A
2.14
3
Maximum operating
frequency
12
G
450
AGC
3.1
AGC input voltage
threshold
FM range: f = 100MHz
Extended: f = 900MHz
3.2
Saturation voltage
10mA
3.3
Leakage current
3.4
Maximum pin diode
current
AGC active, 115°C
PD1
12
3.5
Maximum pin diode
current
AGC not active
PD2
12
DET
Vth1,100
Vthl,900
83
81
PD1,2
85
85
VS – 2.0
PD1,2
19
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
6
1.
Current defined by R11= 68Ω
2.
Current defined by R11= 56Ω
ATR4253C [DATASHEET]
9265C–AUDR–11/14
7.
Electrical Characteristics (Continued)
See test circuit (Figure 8-2 on page 9), VS = 10V, Tamb = 25°C, unless otherwise specified.
No.
Parameters
3.6
Input resistance
3.7
Input capacitance
3.8
3.9
4
Test Conditions
Pin
Symbol
Min.
DET
RDET
f = 100MHz
DET
CDET
IP3 Pin 8 FM
100MHz + 105MHz,
VDET = 120dBµV
DET
Transconductance
dIFMTC / dVFMDET
TC
DET
Typ.
Max.
Unit
Type*
17
25
kΩ
C
1.5
2.0
pF
C
dBµV
C
150
0.35
0.5
0.8
mA/V
(rms)
B
VS
9.5
10
10.5
V
A
VB, RF OUT
40
50
dB
C
1.6
V
A
%
C
V
C
dITC / dVDET
Voltage Regulator / Monitor
4.1
Output voltage of
regulator
Battery voltage
VB = 14V
4.2
Ripple rejection of
regulator
100Hz, VB > VS + 1V
4.3
Threshold for overvoltage detection
OVDET
4.4
Hysteresis of
overvoltage detection
OVDET
5
Antenna Sensor
5.1
Antenna monitor
range
RSENSE = 22kΩ,
antenna detected
ANT SENS
1.8
5
0 to 3
6 to 16
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
1.
Current defined by R11= 68Ω
2.
Current defined by R11= 56Ω
ATR4253C [DATASHEET]
9265C–AUDR–11/14
7
8.
Application Circuits
Figure 8-1. Common Emitter Configuration
1SV264
D1
FMIN
L4*
820nH
C10*
C9
2.2nF
2.2nF
*optional
D2*
C17
2.2nF
C11
C8
R9
10nF
2.2nF
560Ω
FM-OUT
C7
27pF
C13
C12
100nF
1nF
L3
R11
56Ω
C18
C16
2.2nF
22pF
560nH
R8
100Ω
L2
R13
15Ω
120nH
R14
0Ω
1 kΩ
R12
1kΩ
R10*
2 1
Jumper2
J2
L1
120nH
C6
1.2pF
12
11
10
9
IC1
Atmel
ATR4253C
14
15
7
C4
100nF
6
16
+VS
5
1
C15
C5
2.2pF
8
13
2
3
4
220nF
C3
1nF
R4
R2
2 1
Jumper2
J1
27kΩ
2.7kΩ
18kΩ
22kΩ
R1
R3
R5
R7
5.1kΩ
100Ω
C14
220nF
R6
VB
GND
8
ATR4253C [DATASHEET]
9265C–AUDR–11/14
T1
2SB1122
2.2Ω
+ C1
10µF
C2
100nF
Figure 8-2. Common Base Configuration
C8
1SV264
D1
FMIN
2.2nF
C10
C9
2.2nF
2.2nF
T3
L2
120nH
C11
1
6
3
4
C16
22pF
FM-OUT
C7
10nF
R12
1kΩ
L1
120nH
C13
C12
100nF
1nF
R8
100Ω
R9
10Ω
L1
120nH
C6
1.2pF
12
11
10
9
13
IC1
Atmel
ATR4253C
14
15
16
7
C4
100nF
6
+VS
5
1
C15
C5
2.2pF
8
2
3
4
220nF
C3
1nF
R4
R2
2.7kΩ
18kΩ
R1
2 1
Jumper2
J1
27kΩ
Jumper2
J2
27pF
R11
68Ω
22kΩ
2 1
R3
R5
R7
C14
5.1kΩ
100Ω
220nF
R6
VB
GND
T1
2SB1122
2.2Ω
+ C1
C2
10µF
100nF
ATR4253C [DATASHEET]
9265C–AUDR–11/14
9
Figure 8-3. Recommended Footprint
3.2
9 x Ø 0.3
1.75
1.425
0.875
0.325
Pin 1
0.225
1.0
All dimensions in mm
0.25
0.5
10
ATR4253C [DATASHEET]
9265C–AUDR–11/14
9.
Internal Circuitry
Table 9-1.
Equivalent Pin Circuits (ESD Protection Circuits not Shown)
Pin
Symbol
1
ANT SENSE
Function
1
2
2
VSTART
3
OVDET
3
4
4
VREGO
5, 14
GND1, GND2
6
VS
5, 14
6
VS
7
TC
7
ATR4253C [DATASHEET]
9265C–AUDR–11/14
11
Table 9-1.
Equivalent Pin Circuits (ESD Protection Circuits not Shown) (Continued)
Pin
Symbol
8
DET
Function
8
9
9
RFC
10, 16
PD1, PD2
10, 16
11, 13
RFE, BIAS
11, 13
12
RFB
15
REF
12
15
12
ATR4253C [DATASHEET]
9265C–AUDR–11/14
10.
Ordering Information
Extended Type Number
Package
Remarks
MOQ
ATR4253C-PVQW-1
VQFN 3x3 / 16L
Taped and reeled
8000 pieces
Package Information
Top View
D
16
E
1
PIN 1 ID
technical drawings
according to DIN
specifications
A
A3
Side View
A1
Dimensions in mm
Bottom View
D2
5 6 7 8
COMMON DIMENSIONS
4
3
9
10
11
12
2
E2
(Unit of Measure = mm)
e
1
b
11.
L
16 15 14 13
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
2.9
3
3.1
D2
1.6
1.7
1.8
E
2.9
3
3.1
E2
1.6
1.7
1.8
L
0.35
0.4
0.45
b
e
0.2
0.25
0.5
0.3
NOTE
05/20/14
TITLE
Package Drawing Contact:
[email protected]
Package: QFN_3x3_16L
Exposed pad 1.7x1.7
GPC
DRAWING NO.
REV.
6.543-5186.01-4
1
ATR4253C [DATASHEET]
9265C–AUDR–11/14
13
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.
9265C-AUDR-11/14
9265B-AUDR-08/14
14
ATR4253C [DATASHEET]
9265C–AUDR–11/14
History
• Section 10 “Ordering Information” on page 13 updated
• Section 11 “Package Information” on page 13 updated
• Put datasheet in the latest template
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© 2014 Atmel Corporation. / Rev.: 9265C–AUDR–11/14
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