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| 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)： | 35/47頁 |
| 文件大?。?/td> | 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
40 of 47
Philips Semiconductors
TEA5777
Low-power AM/FM stereo radio for handheld applications
13. Application information
13.1 AM coil requirements and alignment
The AM receiver is a magnetic eld receiver. It can be used with a ferroceptor or an
antenna. In both cases, the antenna can be seen as an inductor that should be in
resonance with the on-chip C-bank at the frequency of interest. The C-bank values are
such that a nominal device and nominal antenna inductor value result in the correct tuning
grid depending upon bit STEP0; see Table 16 and Table 27.This puts requirements on the
nominal value and tuning range of the AM antenna. Due to spread an alignment is
needed.
13.1.1 AM coil requirements
In order to align the antenna C-bank the antenna coil must meet the requirements of
[1]
Optimal means that the LC product (L of AM coil and C of C-bank) has zero TC1, since
TC1(C-bank) = +50 ppm/K. Having TC1(L of AM coil) equal to
50 ppm/K is not a hard requirement.
However, it is advisable to keep the TC1(LC product) < 350 ppm/K.
13.1.2 AM coil alignment
Alignment is setting the right C-align value and tuning the AM coil. This is done as follows:
1. Set C-align = 0
2. Measure the resonance frequency 1 (frsn1) with C-bank = 0
3. Measure the resonance frequency 2 (frsn2) with C-bank = 122
4. Set C-bank = 0:
– Tune C-align until the resonance frequency 3 becomes frsn3
– Tune AM coil until the resonance frequency 4 becomes frsn4
The frsn3 and frsn4 values can be calculated based upon frsn1 and frsn2.
This procedure only has to be done once in order to t the AM coil and device together.
The C-align data has to be stored in the microcontroller and should be written every time
the device is powered up.
For C-align the internal digital controlled capacitor is used in principle. It is also possible to
use an external trim capacitor (0 pF to 17 pF) instead. This has the advantage that no
alignment data has to be stored in the microcontroller at the cost of one trim capacitor.
Table 47.
AM coil requirements
Parameter
Value
Nominal value
203
H
Tuning range needed for alignment
(excluding own tolerance)
± 16 %
Optimal TC1[1]
50 ppm/K
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