ATR4253 [ATMEL]
Highly Integrated - All-in-one Active Antenna IC Integrated AGC; 高度集成 - 所有功能于一身的有源天线IC集成AGC
| 型号： | ATR4253 |
| 厂家： | 
ATMEL |
| 描述： | Highly Integrated - All-in-one Active Antenna IC Integrated AGC |
| 文件： | 总9页 (文件大小：315K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
• Highly Integrated - All-in-one Active Antenna IC
• Operating Frequency Range: 50 to 900MHz
– Main Application 76 to 108MHz (Broadcast FM Worldwide)
• Integrated AGC
• Integrated Driver for PIN Diodes
• Integrated Power Supply Regulator
• Integrated Antenna Sensor
• High Dynamic Range
Integrated
Circuit Solution
for Active
• Excellent Noise Performance
• High Intercept Point 3rd Order
• RF Amplifier Adjustable to Various Cable Impedances
• Low Noise Output Voltage
• Low Power Consumption
Antennas
1. Description
The Atmel® ATR4253 is a highly integrated high-performance IC for active antenna
amplification. The device has a built-in AGC, antenna detection, a power supply regu-
lator and two driver stages for external PIN diodes.
Atmel ATR4253
Summary
The Atmel ATR4253 is based on BICMOS technology. The device is designed in par-
ticular 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
NOTE: This is a summary document.
The complete document is available
under NDA. For more information,
please contact your local Atmel sales
office.
ANTENNA VSTART OVDET VREGO
SENSE
9194CS–AUDR–10/10
2. Pin Configuration
Figure 2-1. Pinning VQFN 3x3 / 16 Pins
16 15 14 13
ANT SENSE
VSTART
OVDET
1
2
3
4
12
11
10
9
RFB
RFE
PD2
RFC
Atmel
ATR4253
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
9
RFC
Amplifier Collector (NPN)
10
11
12
13
14
15
16
Paddle
PD2
2
nd AGC output for pin diode
RFE
Amplifier emitter (NPN)
Amplifier base (NPN)
Bias voltage (2.7V)
Ground FM
RFB
BIAS
GND2
REF
Reference voltage (6V)
1st FM AGC output for pin diode
Ground paddle
PD1
GND
2
Atmel ATR4253
9194CS–AUDR–10/10
Atmel ATR4253
3. Functional Description
The Atmel® ATR4253 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
50 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 tran-
sistor 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 reason-
able 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 volt-
age 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 ATR4253 IC, which
reduces the BOM cost and the application size.
3
9194CS–AUDR–10/10
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® ATR4253 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 moni-
tors the supply current for the antenna amplifier (e.g., the car radio).
4
Atmel ATR4253
9194CS–AUDR–10/10
Atmel ATR4253
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
Normal operation
6
VS
7.5
10
11
V
Performance may be reduced, no
malfunction
Supply voltage
6
VS
7
11
35
V
FM emitter current
Thermal condition
11
IRFE
mA
5
9194CS–AUDR–10/10
7. Electrical Characteristics
VS = 10 V, 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 7 mA
pin diode current
VS
Is
19
50
mA
mA
B
C
1.1 Supply current
Tamb = –40 to +115°C;
AGC ON; includes 7mA
pin diode current and
31mA RF current
VS, RFC
Is, IRFC
70
2
RF Amplifier
2.3 Supply current(1)
2.4 Supply current(2)
2.6 Input resistance
2.7 Output resistance
2.8 Power gain
Common base
Common emitter
f = 100MHz
RFC
RFC
IRFC
IRFC
31
35
mA
mA
Ω
B
A
C
C
C
C
C
RF IN
RFMIN
RFMOUT
G
50
f = 100MHz
RF OUT
RF IN, RF OUT
RF OUT
RF OUT
50
Ω
f = 100MHz
5.2
146
1.6
dB
2.9 OIP3 at FMOUT
2.10 NF
Common base
Common base
dBµV
dB
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
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
3.6 Input resistance
3.7 Input capacitance
DET
DET
RDET
CDET
17
25
kΩ
C
C
f = 100MHz
1.5
2.0
pF
4
Voltage Regulator / Monitor
Output voltage of
regulator
Battery voltage
VB = 14V
4.1
VS
9.5
40
10
50
10.5
V
A
C
Ripple rejection of
regulator
4.2
100Hz, VB > VS + 1V
VB, RF OUT
dB
*) 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
6
Atmel ATR4253
9194CS–AUDR–10/10
Atmel ATR4253
8. Ordering Information
Extended Type Number
Package
Remarks
ATR4253-PVPW
VQFN 3x3 / 16L
VQFN 3x3 / 16L
Taped on reel, 2k volume
Taped on reel, 8k volume
ATR4253-PVQW
9. 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
7
9194CS–AUDR–10/10
10. 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
9194CS-AUDR-10/10
9194BS-AUDR-09/10
• Ordering Information table changed
• Section 6 “Operating Range” on page 5 changed
8
Atmel ATR4253
9194CS–AUDR–10/10
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