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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： | 3/47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
11 of 47
Philips Semiconductors
TEA5777
Low-power AM/FM stereo radio for handheld applications
High-side injection or low-side injection of the VCO can be chosen:
High-side injection: local oscillator frequency at mixer input is higher than RF input
signal frequency.
Low-side injection: local oscillator frequency at mixer input is lower than RF input
signal frequency.
8.1.5 AM IF lter
The AM circuit incorporates an I and Q orthogonal channel path with fully integrated
polyphase IF lter. All AM IF ltering is done inside the IC, therefore no external lter
components are required. The center frequency of the lter is 21 kHz and the
3dB
bandwidth amounts to 8 kHz.
8.1.6 AM IF amplication and AM detection
The IF AGC controls the IF amplication and a fully integrated AM detector converts the
AM IF signal into audio. In AM mode the capacitor connected to pin AGC2CAP is used for
IF AGC ltering. The value of this capacitor is a compromise between AGC speed and
THD. In order to achieve an acceptable THD in normal mode and an acceptable AGC
response during e.g. a search action, the time constant can be switched to a value
15 times lower by means of bit AGCIF. In autonomous search mode (bit SEARCH = 1) the
time constant is switched automatically to the lowest value.
8.2 FM radio part
8.2.1 Low noise RF amplier
The FM circuit incorporates a wideband input. The LNA input impedance together with the
LC RF input circuit denes a low Q, FM band-pass lter. The input lter is also used for
impedance matching between the source impedance and the 300
LNA input
impedance between pins RFIN1 and RFIN2. An RF AGC circuit prevents the mixer and IF
lter from overdrive conditions.
8.2.2 FM I/Q mixer
FM quadrature mixers, in an orthogonal I/Q architecture, convert FM RF signals to the
internal fIF = 133.333 kHz or 150 kHz. The mixer architecture provides inherent image
rejection. Whether fIF = 133.333 kHz or 150 kHz is chosen depends on bits FREF[1:0].
For choosing the best signal conditions with respect to the inuence of the image signals,
high-side or low-side injection can be selected:
High-side injection: local oscillator frequency at mixer input is higher than RF input
signal frequency.
Low-side injection: local oscillator frequency at mixer input is lower than RF input
signal frequency.
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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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