參數(shù)資料
型號(hào)： TEA5777HL/N2,118
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP32
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-358-1, LQFP-32
文件頁數(shù)： 2/47頁
文件大小： 219K
代理商： TEA5777HL/N2,118
TEA5777_1
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 11 April 2006
10 of 47
Philips Semiconductors
TEA5777
Low-power AM/FM stereo radio for handheld applications
Bus communication:
Bus communication takes place via the I2C-bus or the 3-wire bus protocol. Selection
of the bus mode is done by hardware programming via pin BUSMODE
4-bit ADC level information, 1-bit IF counter and mono or stereo indication (in FM
mode) can be read via the bus. Alternatively, the mono or stereo and the IF in-window
indication can be obtained via silent readout via the bus lines CLOCK and DATA
8.1 AM radio part
8.1.1 AM RF amplier
The AM input pin AMRFIN has a (selectable) high-impedance input. The input is intended
to be connected to the top of a tuned circuit. The input impedance is determined by the
LNA gain (bit LNA) and the value of the LNA feedback resistor (bit RFB).
For large RF input signals, the RF AGC reduces the input signal level to the AM front end
in order to prevent overloading. The required AM RF AGC time constant is created by
means of an internal current source and the capacitor connected to pin
PILDET/AMRFAGC. During search operation the response time of this RF AGC circuit
can be speeded up via the bus control by bit AGCRF.
8.1.2 Tuning AM antenna circuit
The tuning capacitor for the AM antenna circuit has been integrated by means of a
capacitor bank (C-bank) and the tuning frequency can be programmed in discrete steps
via the bus. No external varactor diode is required. In order to match the capacitor bank to
the external AM antenna coil, a provision has been made to electronically align the IC to
the AM antenna. For this bit CALLIGN has to be set to logic 1 and the corresponding bits
C[6:0] have to be programmed. After this alignment bit CALLIGN should be set to logic 0
again to freeze the alignment capacitor value and to enable the control over the main
capacitor bank again.
For more details on the alignment, see Section 13.1 and the application note.
For LW mode an external capacitor needs to be added in parallel to the LW coil.
8.1.3 AM I/Q mixer
AM quadrature mixers, in an orthogonal architecture, convert AM RF signals to the
internal fIF = 21 kHz. The mixer architecture provides inherent image rejection.
8.1.4 AM VCO
The fully integrated VCO provides the local oscillator signals for the AM quadrature
mixers. No external components are required.
The internal VCO frequency ranges from 4 MHz to 14 MHz and the proper divider ratio is
chosen by selecting the MW or LW band via the bus control bit MWLW.
Programming of the VCO is done:
For MW: fVCO = 8 × (fRF ± fIF)
For LW: fVCO = 32 × (fRF ± fIF)
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