ATR4253C-PVQW [ATMEL]
Telecom Circuit, 1-Func, BICMOS, 3 X 3 MM, VQFN-16;型号: | ATR4253C-PVQW |
厂家: | ATMEL |
描述: | Telecom Circuit, 1-Func, BICMOS, 3 X 3 MM, VQFN-16 电信 信息通信管理 电信集成电路 |
文件: | 总14页 (文件大小:1350K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Atmel 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
9265A–AUDR–08/12
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
12
RFE
11
PD2
10
RFC
9
FM
Amplifier
13
14
15
16
8
7
6
5
BIAS
GND2
REF
DET
TC
Voltage
Supply
AGC
(FM)
VS
Antenna
Detection
Over
Voltage
PD1
GND1
1
2
3
4
ANTENNA VSTART OVDET VREGO
SENSE
Atmel ATR4253C [DATASHEET]
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9265A–AUDR–08/12
2.
Pin Configuration
Figure 2-1. Pinning QFN 3x3 / 16 Pins
16 15 14 13
ANT SENSE
VSTART
OVDET
1
2
3
4
12
11
10
9
RFB
RFE
PD2
RFC
Atmel
ATR4253C
VREGO
5
6
7
8
Table 2-1.
Pin Description
Symbol
Pin
Function
Antenna sense input
1
2
ANT SENSE
VSTART
OVDET
VREGO
GND1
VS
Comparator input of voltage detector
Overvoltage detection input
Voltage regulator output
Ground voltage regulator
Supply voltage
3
4
5
6
7
TC
AGC time constant
8
DET
AGC level detector input
Amplifier Collector (NPN)
2nd AGC output for pin diode
Amplifier emitter (NPN)
Amplifier base (NPN)
Bias voltage (2.7V)
9
RFC
10
11
12
13
14
15
16
Paddle
PD2
RFE
RFB
BIAS
GND2
REF
Ground FM
Reference voltage (6V)
1st FM AGC output for pin diode
Ground paddle
PD1
GND
Atmel ATR4253C [DATASHEET]
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9265A–AUDR–08/12
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
3.4
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.
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).
Atmel ATR4253C [DATASHEET]
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9265A–AUDR–08/12
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
6
Symbol
VS
Min.
–0.3
–500
0
Max.
+12
+500
2
Unit
V
Supply voltage
Antenna sense current
Comparator input current
Overvoltage detector
Collector of FM amplifier
Power dissipation
Junction temperature
Ambient temperature
Storage temperature
ESD HBM
1
ANT SENSE
VSTART
OVDET
RFC
µA
mA
V
2
3
–0.3
3
+3.3
16
9
V
Ptot
700
150
+115
+150
+2
mW
°C
°C
°C
kV
Tj
Tamb
–40
–50
–2
Tstg
All
VHBM
5.
Thermal Resistance
Parameters
Symbol
RthJA
Value
Unit
Junction ambient, soldered on PCB, dependent on PCB layout
40
K/W
6.
Operating Range
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
Supply voltage
FM emitter current
Normal operation
6
VS
7.5
10
11
V
Performance may be reduced, no
malfunction
6
VS
7
11
35
V
Thermal condition
11
IRFE
mA
Atmel ATR4253C [DATASHEET]
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9265A–AUDR–08/12
7.
Electrical Characteristics
See test circuit (Figure 8-2 on page 9), VS = 10V, Tamb = 25°C, unless otherwise specified.
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
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
VS
Is
Is
15
20
10
25
mA
mA
A
A
1.1 Supply current
Over voltage
14.9
Tamb = –40 to +115°C;
AGC ON; includes 7mA
pin diode current and
31mA RF current
VS, RFC
Is, IRFC
50
70
mA
C
1.2 Bias voltage output
BIAS
BIAS
REF
VBIAS
IBIAS
2.5
0
2.8
3.1
3
V
mA
V
A
B
A
Output current of bias
voltage
1.3
1.5 Bias voltage output
1kΩ output resistor
VREF
5.7
6
6.3
2
RF Amplifier
2.1 Emitter voltage
2.2 Emitter voltage
2.3 Supply current(1)
2.4 Supply current(2)
T = 25°C
RFE
RFE
RFC
RFC
2.0
1.9
2.1
2.1
31
2.2
2.3
V
V
A
C
B
A
T = –40°C to +115°C
Common base
Common emitter
IRFC
IRFC
mA
mA
35
Maximum output
voltage
2.5
Vs = 10V
RFC
12
Vpp
C
2.6 Input resistance
2.7 Output resistance
2.8 Power gain
f = 100MHz
RF IN
RF OUT
RFMIN
RFMOUT
G
50
50
Ω
Ω
C
C
C
C
C
f = 100MHz
f = 100MHz
Common base
Common base
RF IN, RF OUT
RF OUT
5.2
146
1.6
dB
2.9 OIP3 at FMOUT
2.10 NF
dBµV
dB
RF OUT
f = 100MHz, common
emitter
2.11 Power gain
RF OUT
G
13.5
dB
B
2.12 OIP3 at FMOUT
2.13 NF
Common emitter
Common emitter
RF OUT
RF OUT
140
3.5
dBµV
dB
B
C
Maximum operating 3dB corner, common
2.14
3
RF OUT
450
MHz
C
frequency
emitter
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
3.1
DET
3.2 Saturation voltage
3.3 Leakage current
10mA
PD1,2
PD1,2
VS – 2.0
V
B
B
1
µA
Maximum pin diode
current
3.4
AGC active, 115°C
AGC not active
PD1
PD2
12
12
19
mA
mA
D
A
Maximum pin diode
current
3.5
*) 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
Atmel ATR4253C [DATASHEET]
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9265A–AUDR–08/12
7.
Electrical Characteristics (Continued)
See test circuit (Figure 8-2 on page 9), VS = 10V, Tamb = 25°C, unless otherwise specified.
No. Parameters
Test Conditions
Pin
DET
DET
Symbol
RDET
Min.
17
Typ.
Max.
25
Unit
kΩ
Type*
3.6 Input resistance
3.7 Input capacitance
C
C
f = 100MHz
CDET
1.5
2.0
pF
100MHz + 105MHz,
VDET = 120dBµV
3.8 IP3 Pin 8 FM
DET
150
0.5
dBµV
C
B
TC
DET
mA/V
(rms)
3.9 Transconductance
dIFMTC / dVFMDET
dITC / dVDET
0.35
0.8
4
Voltage Regulator / Monitor
Output voltage of
regulator
Battery voltage
VB = 14V
4.1
VS
9.5
40
10
50
10.5
V
dB
V
A
C
A
C
Ripple rejection of
regulator
4.2
4.3
100Hz, VB > VS + 1V
VB, RF OUT
OVDET
Threshold for over-
voltage detection
1.6
1.8
Hysteresis of
overvoltage detection
4.4
5
OVDET
5
%
Antenna Sensor
Antenna monitor
range
RSENSE = 22kΩ,
antenna detected
5.1
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. Current defined by R11= 68Ω
2. Current defined by R11= 56Ω
Atmel ATR4253C [DATASHEET]
7
9265A–AUDR–08/12
8.
Application Circuits
Figure 8-1. Common Emitter Configuration
L4*
1SV264
D1
*optional
820nH
FMIN
C10*
C9
2.2nF
2.2nF
D2*
C17
2.2nF
C11
C8
R9
FM-OUT
C7
560Ω
2.2nF
10nF
27pF
2
1
R12
1kΩ
R14
0Ω
Jumper2
J2
R13
15Ω
R11
56Ω
R8
100Ω
C13
100nF
C12
1nF
C18
C16
L1
120nH
L3
560nH
C6
1.2pF
2.2nF 22pF
12 11 10
9
4
C5
2.2pF
13
8
7
6
5
IC1
Atmel
ATR4253C
14
15
16
C4
100nF
+VS
1
2
3
C15
C3
1nF
220nF
R4
R1
R2
2
1
Jumper2
J1
R3
C14
R5
5.1kΩ
R7
100Ω
R6
220nF
VB
GND
T1
2SB1122
2.2Ω
C1
C2
100nF
+
10µF
Atmel ATR4253C [DATASHEET]
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9265A–AUDR–08/12
Figure 8-2. Common Base Configuration
C8
1SV264
D1
2.2nF
FMIN
C10
2.2nF
C9
2.2nF
T3
1
3
6
4
L2
120nH
C16
C11
22pF
FM-OUT
C7
10nF
27pF
L1
R11
68Ω
2
1
R12
1kΩ
Jumper2
J2
120nH
R9
10Ω
R8
100Ω
C13
100nF
C12
1nF
C6
1.2pF
L1
120nH
12 11 10
9
C5
2.2pF
13
14
15
16
8
7
6
5
IC1
Atmel
ATR4253C
C4
100nF
+VS
1
2
3
4
C15
C3
1nF
220nF
R4
R1
R2
2
1
Jumper2
J1
R3
C14
R5
5.1kΩ
R7
100Ω
220nF
R6
2.2Ω
VB
GND
T1
2SB1122
C1
C2
100nF
+
10µF
Atmel ATR4253C [DATASHEET]
9
9265A–AUDR–08/12
Figure 8-3. Recommended Footprint
3.2
9 x Ø 0.3
1.75
1.425
0.875
0.325
0.225
1.0
All dimensions in mm
0.25
0.5
Atmel ATR4253C [DATASHEET]
10
9265A–AUDR–08/12
9.
Internal Circuitry
Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown)
Pin
Symbol
Function
1
1
ANT SENSE
2
2
VSTART
3
3
4
OVDET
VREGO
4
5, 14
5, 14
GND1, GND2
6
VS
6
VS
7
7
TC
Atmel ATR4253C [DATASHEET]
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9265A–AUDR–08/12
Table 9-1. Equivalent Pin Circuits (ESD Protection Circuits not Shown) (Continued)
Pin
Symbol
Function
8
8
DET
9
9
RFC
10, 16
PD1, PD2
10, 16
11, 13
RFE, BIAS
11, 13
12
12
RFB
15
REF
15
Atmel ATR4253C [DATASHEET]
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9265A–AUDR–08/12
10. Ordering Information
Extended Type Number
ATR4253C-PVPW
Package
Remarks
VQFN 3x3 / 16L
VQFN 3x3 / 16L
Taped on reel, 2k volume
Taped on reel, 8k volume
ATR4253C-PVQW
11. Package Information
Top View
D
16
1
technical drawings
according to DIN
specifications
PIN 1 ID
Side View
Bottom View
COMMON DIMENSIONS
(Unit of Measure = mm)
D2
Symbol MIN
NOM
0.9
MAX NOTE
A
A1
A3
D
0.8
0.0
1
5
6 7 8
0.02
0.2
0.05
0.25
3.1
0.15
2.9
4
3
9
3
2
1
D2
E
1.7
1.75
3
1.8
10
11
12
2.9
3.1
E2
L
1.7
1.75
0.4
1.8
0.3
0.5
b
0.18
0.25
0.5 BSC
0.32
16 15 14 13
L
e
11/11/09
DRAWING NO.
TITLE
REV.
Package Drawing Contact:
packagedrawings@atmel.com
Package: VQFN_3x3_16L
Exposed pad 1.75 x 1.75
6.543-5164.01-4
1
Atmel ATR4253C [DATASHEET]
13
9265A–AUDR–08/12
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