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| 型號： | TEA5760UK/N1/S21,0 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA25 |
| 封裝： | 3 X 2.80 MM, 0.60 MM HEIGHT, WLCSP-25 |
| 文件頁數(shù)： | 36/37頁 |
| 文件大?。?/td> | 209K |
| 代理商： | TEA5760UK/N1/S21,0 |
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TEA5760UK_1
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 14 December 2006
7 of 36
NXP Semiconductors
TEA5760UK
Single chip FM stereo radio
6.10 IF counter
The received RF signal is converted down to a 225 kHz IF. The IF is measured by means
of a frequency counter. A correct IF frequency measurement result indicates that the radio
is tuned to a valid channel and not to an image or a channel with high interference. The
7-bit IF counter output can be read via the control interface. The IF counter is active when
the tuning algorithm is active (see Figure 3) and the outcome can be read via the control
interface. It activates a ag if the IF count result lies outside a predened window. The IF
count period can be set to 1.953 ms or 15.625 ms with bit IFCTC in register TNCTRL (see
6.11 Level voltage generator and analog-to-digital converter
The level voltage reects the received eld strength at the antenna. The analog level
voltage is digitized to 4 bits by the level Analog-to-Digital Converter (ADC). During a
search or preset tuning cycle the level ADC is activated and the recorded level ADC
information is stored in the registers. The level ADC information is used during search as
well as preset tuning to compare the received signal strength with a search stop level (see
Section 7.1.4.3). A ag will be set to indicate that the level voltage is below the predened
search stop level (see Figure 3). When the tuning algorithm is nished the level ADC is
deactivated.
6.12 Mute
6.12.1 Soft mute
The low-pass ltered level voltage drives the soft mute attenuator. At low RF input levels,
the audio output is faded and hence also the noise. The soft mute function can be
disabled with bit SMUTE in register TNCTRL (see Table 13).
6.12.2 Hard mute
With bit MU in register TNCTRL (see Table 14) the audio outputs VAFL and VAFR can be
hard muted, this means they are put in high ohmic mode. The same can be done by
setting bits LHM (Left Hard Mute) or RHM (Right Hard Mute) in register TESTREG (see
Table 19), which mutes only one output at a time (or both when both set). When one
output is muted, the stereo decoder switches to mono. If the TEA5760UK is in Standby
mode the audio outputs are in high impedance mode, see Table 3.
Table 3.
Specication of mute modes
Type
Description
Left
Right
Impedance
Mode
Impedance
Mode
AFM
Audio Frequency
Mute
350
muted
350
muted
MU
Hard Mute
500 k
muted
500 k
muted
LHM
Left Hard Mute
500 k
muted
350
mono audio
RHM
Right Hard Mute
350
mono audio
500 k
muted
Standby
1 M
muted
1 M
muted
SMUTE
Soft Mute
RF level sensitive audio level. Has no inuence on mute
or pin impedance.
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