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参数资料
| 型号： | TEA5760UK/N1/S21,1 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA25 |
| 封装： | 3 X 2.80 MM, 0.60 MM HEIGHT, WLCSP-25 |
| 文件页数： | 4/37页 |
| 文件大小： | 209K |
| 代理商： | TEA5760UK/N1/S21,1 |
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TEA5760UK_1
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 14 December 2006
11 of 36
NXP Semiconductors
TEA5760UK
Single chip FM stereo radio
6.19.3 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 LO injection is positioned at the opposite side of the wanted
channel (see Figure 4). Indication for image frequency interference can be derived from
the IF frequency counter. To enable this feature bit AHLSI has to be set to logic 1.
The search/preset algorithm will stop and generate an interrupt event after 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 6.5).
Table 4.
Tuner truth table
Bit
Comment
IFFLAG
BLFLAG
FRRFLAG
0
if INTX has gone low and IFMSK, LEVMSK,
FRRMSK and BLMSK were set then this cannot
occur
0
1
channel found during search, BLMSK and
FRRMSK set
0
1
0
not a valid combination
0
1
no channel found and the band limit has been
reached during a search, BLMSK and FRRMSK
set
1
0
not possible during a preset or a search
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.
1
0
not a valid combination
1
band limit is reached during search, no valid
channel found
Fig 4.
Switch from high-side injection of LO 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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