ATR2732-PBPW Atmel, ATR2732-PBPW Datasheet - Page 4

• Manufacturer Part Number: ATR2732-PBPW
• Description: IC INT ONE-CHIP FRONT END 64QFN
• Manufacturer: Atmel

Specifications of ATR2732-PBPW

• Rf Type: DAB, Broadcast Radio
• Frequency: 1.452GHz ~ 1.492GHz, 167MHz ~ 240GHz
• Features: Fractional PLL for VHF
• Package / Case: 64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 2-1.
3. Functional Description
3.1
4
Paddle
Pin
55
56
57
58
59
60
61
62
63
64
Main Functions
ATR2732 [Preliminary]
PFDOUTL Output of phase comparator for VCO for L-band (connected to PLL loop filter)
Pin Description (Continued)
GDMIXL
Symbol
MILIN+
MILIN
XTALA
XTALB
XOUT
MISO
GND
VDD
VDI
–
Function
Inputs and outputs of serial bus (refer to serial bus protocol)
Crystal oscillator clock output to baseband
If used: AC-couple to baseband (single VCXO concept)
If not used: short-circuit to GND
Supply voltage from baseband (1.65V to 3.6V) to adaptation interface to baseband
Connection for reference clock crystal
Connection for reference clock crystal
Supply for digital circuits
Ground (L-band mixer)
(Differential) Input of L-band mixer
(Differential) Input of L-band mixer
Ground
The ATR2732 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 (174 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.
The following description gives a short overview of the general signal flow using the ATR2732
front-end IC for reception of DAB signals. Numbers in the text refer to the numbers in
on page
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 (174 MHz to 240 MHz). The signal
leaves the IC at point (4), followed by an external preselection filter.
5.
4918AS–DAB–03/06
Figure 3-1