參數(shù)資料
型號： 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)： 4/47頁
文件大?。?/td> 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
12 of 47
Philips Semiconductors
TEA5777
Low-power AM/FM stereo radio for handheld applications
8.2.3 FM VCO
The symmetrical LC, varactor tuned VCO provides the oscillator signals for the FM
quadrature mixers (pins VCOTANK1 and VCOTANK2). The VCO operates at double the
RF frequency fVCO =2 × (fRF ± fIF) and has an internal AGC control circuit in order to
guarantee good start-up behavior and carrier-to-noise ratio (C/N) even with low Q coils
(Q > 40). High-side injection (+fIF) or low-side injection (fIF) of the VCO can be chosen
via the bus control.
8.2.4 FM IF lter
The FM signal path incorporates an I and Q orthogonal FM channel with fully integrated
polyphase IF lter. All FM IF ltering is done inside the IC, therefore no external lter
components are required. The center frequency of the lter matches the chosen IF
(fIF = 133.333 kHz or 150 kHz) and has a 3 dB bandwidth of approximately 110 kHz.
8.2.5 FM demodulator
The FM demodulator is fully integrated and needs no external components. In order to
remove undesired IF and or RF input related components, a 80 kHz low-pass lter has
been integrated.
8.3 Stereo decoder
8.3.1 MPX decoder
The PLL stereo decoder is alignment free and incorporates a fully integrated PLL loop
lter. The stereo decoder can be switched to forced mono via bus control bit FOMO.
8.3.2 Signal strength depending mono/stereo blend
When decreasing the RF input level, the MPX decoder blends from stereo to mono to limit
the output noise. The control signal is obtained from the low-pass ltered level information
at pin TMUTE. This blend function, called SDS, can also be switched off via bus control bit
SDSOFF and a RF level related sudden change from stereo to mono transition will result.
8.3.3 Pilot detector
A pilot detector, with external lter capacitor at pin PILDET/AMRFAGC, is used to detect
the presence of a stereo signal. Mono or stereo reception can be read via the bus control,
but can also be passed to pin DATA in the Dbus mode (see Section 9). For this option, bit
DBUS has to be programmed. In this case, no bus action is required (silent readout) to
read the status of the pilot detector and the information is continuously available.
8.3.4 De-emphasis
In FM mode, the de-emphasis is switchable between 50
s and 75 s (bit DEEM). In AM
mode, bit DEEM selects a low-pass lter with the time constant 50
sor75 s in order to
limit the noise bandwidth.
8.4 Tuning function
The tuning concept of the TEA5777 is based on a PLL and programming of the required
frequency takes place via the bus control.
相關PDF資料
PDF描述
TEA5777HN/N2,518 AM/FM, AUDIO SINGLE CHIP RECEIVER, PQCC48
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TEA6300TD-T 2 CHANNEL(S), SOUND FADER CONTROL CIRCUIT, PDSO28
TEA6300TD 2 CHANNEL(S), SOUND FADER CONTROL CIRCUIT, PDSO28
TEA6300T 2 CHANNEL(S), SOUND FADER CONTROL CIRCUIT, PDSO28
相關代理商/技術參數(shù)
參數(shù)描述
TEA5777HL-T 功能描述:調諧器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TEA5777HN 功能描述:調諧器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TEA5777HN/N2,518 功能描述:調諧器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TEA5777HN/N2,557 功能描述:調諧器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TEA5777HN-T 功能描述:調諧器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
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