參數(shù)資料
型號(hào)： TEA5766UK
廠(chǎng)商： ST-ERICSSON
元件分類(lèi)： 接收器
英文描述： FM, AUDIO SINGLE CHIP RECEIVER, PBGA25
封裝： 3.30 X 3.25 MM, 0.60 MM HEIGHT, WLCSP-25
文件頁(yè)數(shù)： 4/60頁(yè)
文件大?。?/td> 298K
代理商： TEA5766UK
TEA5766UK_1
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 01 — 22 March 2007
11 of 59
NXP Semiconductors
TEA5766UK
Stereo FM radio + RDS
[1]
This table is valid until 31.25 ms after the tuning cycle has completed. It shows the outcome of the ag
register when a read is done after INTX has gone LOW with the condition that no other mask bits are set
than shown in the table.
7.20.1 Auto high-side and low-side injection stop switch
The channel quality can sometimes be improved in case of image frequency interference.
This can be achieved if the Local Oscillator (LO) injection is positioned at the opposite
side of the wanted channel (see Figure 3). Indication for image frequency interference can
be derived from the IF frequency counter. To enable this feature the AHLSI bit must be set
to logic 1.
The search/preset algorithm will stop and generate an interrupt event after the detection
of a valid RSSI level in combination with a frequency outside the IF frequency window.
The host processor can detect this state by reading the interrupt register. Swap of the LO
injection is achieved by inversion of bit HLSI in combination with a new tuning word for the
changed oscillator frequency (see Section 7.5).
7.20.2 Muting during search or preset
During preset and search the tuner is always muted, which is done by the algorithm itself.
When the AHLSI bit is set and the tuner has stopped during a preset or a search because
of a wrong IF count, the tuner keeps muted and generates an interrupt event. In this way
the host processor can switch the high or low setting quietly and waits for the new result.
All these mute actions are done by blocking the audio signal and the audio output will
keep its DC level and stay in low-impedance state i.e. 50
(see Table 4). A hard mute
with the MU bit will cause a plop.
101a preset or search has been done, but the wanted channel
has a valid RSSI level but fails the IF count; when AHLSI
was set HLSI must be toggled and a new PLL value must be
programmed; FRRMSK set
1
0
not a valid state
1
band limit is reached during search; no valid channel found;
BLMSK or FRRMSK set
Table 5.
Tuner truth table[1] …continued
Bit
Comment
IFFLAG
BLFLAG
FRRFLAG
Fig 3.
Switch LO from high-side injection to low-side injection using the HLSI bit
001aab460
image on high-side
wanted channel
switch LO from high-side to low-side
image on low-side
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