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| 型号： | TEA5777HL/N2,118 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP32 |
| 封装： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-358-1, LQFP-32 |
| 文件页数： | 5/47页 |
| 文件大小： | 219K |
| 代理商： | TEA5777HL/N2,118 |
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TEA5777_1
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 11 April 2006
13 of 47
Philips Semiconductors
TEA5777
Low-power AM/FM stereo radio for handheld applications
8.4.1 Reference frequency generation
The internally required reference frequency can be obtained from the integrated crystal
oscillator or from an externally applied reference signal of 13 MHz. Selection of the
reference signal (internal or external) takes place via the bus control.
The reference frequency signals are used for:
Reference frequency divider for the PLL synthesizer
Center frequency adjustment of the IF lters
Free running frequency adjustment of the stereo decoder VCO
Clocking the stereo decoder state machine
Timing of the IF counter
Sampling the RF level for the level ADC
8.4.2 Crystal oscillator
The symmetrical crystal oscillator can operate with a 4 MHz clock crystal. An amplitude
control function is implemented in order to minimize the higher harmonic component
signal levels.
8.4.3 IF counter
An IF counter has been added for search-stop detection (optional, i.e. can be enabled or
disabled via bit IFCE). The IF counter result is a 1-bit output and in-window yes or no and
available via bus control. In order to minimize the interference, the IF counter can be
disabled via the bus control bit IFCE. In both AM and FM modes, two IF window settings
can be chosen by bit IFW.
When Dbus mode is activated and bit IFCE = 1, the IF counter result is available at pin
DATA (see Table 8). In this mode, the IF counter ready ag (bit IFCRDY) is put on pin
DATA. Disabling bit IFCE, while Dbus mode is active, puts the mono or stereo indication
information on pin DATA. In this case no bus actions are required to read the status of the
IF counter (silent readout).
Remark: For updating the IF counter information a short pulse on pin WRITE_READ
should be generated.
8.4.4 Automatic search operation
The IC can be programmed to an autonomous search mode operation. In this mode, the
IC will search for a new station without the need of communication to the microcontroller.
To enable this mode, bit SEARCH has to be set. Under control of bit UPDWN, search stop
level bits SLEV[1:0] and search step control bits STEP[1:0], various search modes can be
selected (see Section 9).
Before this mode can be activated, rst the upper and lower band limits have to be
programmed. Bit PROGBLIM = 1 and bit UPDWN = 1 programs the upper band limit,
while bit PROGBLIM = 1 and bit UPDWN = 0 programs the lower band limit. Bit SFOUND
signals whether a new station is found. Bit BLIM signals whether a band limit is reached.
In AM mode, bit AMDELAY selects either a 40 ms or 80 ms delay time. The best value to
be selected depends on the realized AM IF AGC response (see Section 8.1.6).
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相关代理商/技术参数 |
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| TEA5777HL-T | 功能描述:调谐器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪声系数: 工作电源电压: 最小工作温度: 最大工作温度: |
| TEA5777HN | 功能描述:调谐器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪声系数: 工作电源电压: 最小工作温度: 最大工作温度: |
| TEA5777HN/N2,518 | 功能描述:调谐器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪声系数: 工作电源电压: 最小工作温度: 最大工作温度: |
| TEA5777HN/N2,557 | 功能描述:调谐器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪声系数: 工作电源电压: 最小工作温度: 最大工作温度: |
| TEA5777HN-T | 功能描述:调谐器 AM/FM STEREO RoHS:否 制造商:NXP Semiconductors 功能: 噪声系数: 工作电源电压: 最小工作温度: 最大工作温度: |
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