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PDF ATR2732N1 Data sheet ( Hoja de datos )
| Número de pieza | ATR2732N1 | |
| Descripción | Integrated DAB One-chip Front End | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• ATR2w7w3w2N.D1atiasSaheSept4eUc.icaolmVersion of ATR2732 Recommended for Automotive
Applications
• Highly Integrated DAB Front-end Solution Covering Band III and L-band Reception
• Convenient Internal Clock Generation, Single Reference Clock
• Fractional PLL for VHF
• Fully Integrated VCOs
• High-precision Digitally Tunable Reference Oscillator
• Integrated High-performance LNAs
• Very Flexible Programming of the AGC
• Automatically Aligned External Filter Tuning
• Simple Three-wire Digital Control Interface for Easy Handling
• Single Low Voltage (3.3V) Supply Operation
• Low Current Consumption Due to Several Power-down Options
• Small SMD Package (QFN 9 mm × 9 mm)
Applications
• Commercial DAB Receivers
• DAB Receiver Solutions for Car Radio Applications
• Portable DAB Solutions
Integrated DAB
One-chip Front
End
ATR2732N1
Summary
1. Description
The ATR2732N1 is a front-end monolithic integrated circuit, manufactured using
Atmel®’s silicon-germanium BiCMOS process (SiGMOS).
The ATR2732N1 carries out all functions of RF and IF processing, as well as the
clock-signal generation for these functions. Therefore, there is an integrated fractional
PLL, which, equivalent to most of the other functions, can be controlled via an external
digital bus. The RF functions include LNA, down-conversion mixing, amplifying, detec-
tion, and gain control. An external SAW filter is required in the signal path after the RF
functions. Additional amplifiers with detection and control functions are integrated IF
functions.
The device offers several tuning support functions, and was created to simplify the
design and manufacturing process. To this end, the number of external components
are minimal.
The part fits perfectly to Atmel’s DAB baseband processor ATR2740.
NOTE: This is a summary document.
The complete document is available
under NDA. For more information,
please contact your local Atmel sales
office.
9130AS–DAB–04/08
1 page  
ATR2732N1
3. Functional Description
www.DataSheet4U.com The ATR2732N1 front-end IC was developed as a tuner IC for DAB reception. It was designed
for operation in L-band (1452 MHz to 1492 MHz) and VHF BIII (167 MHz to 240 MHz). The front
end contains gain-controlled LNAs, an L-band mixer with a corresponding PLL, and a VHF-band
mixer with a fractional PLL. The IF path contains three gain-controlled amplifiers. The front-end
IC allows the use of automatic tuning, which contains an adjustable input filter for VHF BIII and
an adjustable preselection filter for L-band and VHF reception.
The high dynamic range of the RF inputs, the use of gain-controlled amplifiers and gain-con-
trolled mixers in the RF and IF path, and an integrated driver for an external PIN diode
attenuator (VHF band) offer the possibility of handling even strong RF input signals.
The RF and IF parts include AGC functional blocks, which are needed for proper operation. The
thresholds are programmable via a simple serial bus.
The SPI bus is used to adjust and control all functional blocks.
The following sections briefly describe the major functions and features.
3.1 Main Functions
The following description gives a short overview of the general signal flow using the ATR2732N1
front-end IC for reception of DAB signals. Numbers in the text refer to the numbers in Figure 3-1
on page 6.
A DAB signal in the L-band frequency range (1452 MHz to 1492 MHz) is received by the L-band
antenna; a separate LNA with a separate input is available for the VHF Band III signals. In both
cases, the signal is band-pass filtered using a filter with low insertion loss. The internal variable
gain LNA (for L-band (1), for Band III (3)) amplifies the signal. For the L-band reception, a sec-
ond band-pass filter is placed between the LNA output and mixer input at (2). This mixer
converts the L-band signal to the VHF BIII frequency range (167 MHz to 240 MHz). The signal
leaves the IC at point (4), followed by an external preselection filter.
This filter has an automatic tuner adjustment; that is, the tuning-voltage-generation block adjusts
the pass band of this filter to the desired frequency. After passing this filter, the RF signal is
down-mixed to a fixed IF frequency of 38.912 MHz. The IF signal is amplified and passed to a
SAW filter (5). The first IF variable-gain amplifier is followed by an IF filter at position (6). This fil-
ter is used as an anti-alias-filter. Finally, the DAB signal is amplified using the 2nd IF amplifier.
The signal leaves the front-end IC at (7), giving the signal to the DAB baseband IC.
9130AS–DAB–04/08
5
5 Page 
ATR2732N1
7. Electrical Characteristics
www.DataSheet4U.com
Test conditions (if not otherwise specified): VCC = +3.3V, Tamb = +25°C, 50Ω input match
No. Parameters
Test Conditions
Pin Symbol Min.
Typ.
Max.
Unit
1 Power Supply
1.1
Supply voltage of front
end ATR2732N1
VCC 3.0
3.5 V
1.2
Supply voltage of
baseband processor
VDi 1.65
VCC
V
1.3 Leakage current, all off
2 Power Control
I leak
3 25 µA
2.1 Power on/off delay
1 µs
2.2 Power off/on delay
5 ms
2.3
Supply current L-band
off
Reception only VHF
150 mA
2.4 Supply current L-band
185 mA
2.5
Power-off tuning
voltage generation
Tuning generation not
active
140 mA
2.6
Average current
consumption
80 mA
3 SPI Bus Interface
3.1 BUS voltage high
3.2 BUS voltage low
3.3 Clock frequency
3.4 Clock high time (SCK)
3.5 Clock low time (SCK)
3.6 Clock enable time
3.7 Data set-up time
3.8 Hold time MOSI
4 Reference Crystal Oscillator
VBUSH
VBUSL
1 / tper
tch
tcl
tcet
tsud
thda
VDi – 0.36
–0.3
0.4 × tper
0.4 × tper
5
0.4 × tper
0.4 × tper
VDi + 0.3
0.25
2
V
V
MHz
µs
4.1 Operating frequency
16 24.576 32
MHz
4.2 Tuning range
120 210
ppm
4.3
Reference clock output
voltage
Sine wave output
0.5 Vpp
5 VHF Fractional PLL
5.1 LO frequency
200 290 MHz
6 L-band PLL
6.1 LO frequency
1.26 1.27 GHz
7 IF Interface
7.1 IF frequency range
30 38.91 50
MHz
7.2
Output impedance
(differential)
46, 47
56 100 Ω
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Type*
A
A
A
C
C
A
A
B
B
A
A
A
C
A
A
A
A
D
D
9130AS–DAB–04/08
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ATR2732N1.PDF ] | |
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