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| 型號： | TEA5764HN |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | FM radio + RDS |
| 中文描述： | FM, AUDIO SINGLE CHIP RECEIVER, PQCC40 |
| 封裝： | 6 X 6 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT-618-1, HVQFN-40 |
| 文件頁數(shù)： | 13/64頁 |
| 文件大小： | 287K |
| 代理商： | TEA5764HN |
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TEA5764HN_2
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 9 August 2005
13 of 64
Philips Semiconductors
TEA5764HN
FM radio + RDS
8.21.1
Search mode
Search mode is initiated by setting bit SM in byte FRQSETMSB to logic 1. The search
direction is set by bit SUD; SUD = 0 (search down), bit SUD = 1 (search up). The tuner
starts searching at the frequency set in bytes FRQSETLSB and FRQSETMSB. The
Search Stop Level (SSL) bits define the field strength level at which a desired channel is
detected. The tuner will stop on a channel with a field strength equal to or higher than this
reference level and then checks the IF frequency; when both are valid, the search stops
(Note that this depends on bit AHLSI described in
Figure 3
). If the level check or the IF
count fails, the search continues. If no channels are found, the TEA5764HN stops
searching when it has reached the band limit, setting the BLFLAG HIGH. A search always
stops when the FRRFLAG is set and on the occurrence of a hardware interrupt, this
procedure is shown in
Figure 3
.
The search algorithm can stop at a frequency that is offset from the IF by up to a
maximum of 12 kHz. The maximum offset can be limited to 8 kHz by applying a preset.
For optimum tuning, it is recommended that a preset is applied after a search and when
the found frequency has an offset that is above 8 kHz.
After this interrupt the TEA5764HN will not update the tuner registers for a period of 15
ms. The state of the TEA5764HN can be checked by reading the bytes of INTFLAG,
FRQCHKMSB, FRQCHKLSB, TNCTRL1 and TNCTRL2.
Table 4
shows the possible
states of these registers after an auto search.
[1]
This table is valid until 30.6 ms after the tuning cycle has completed. It shows the outcome of the flag
register when a read is done after pin INTX goes LOW on condition that no mask bit other than FRRMSK is
set.
8.21.2
Preset mode
A preset occurs by setting bit SM to logic 0 and writing a frequency to byte FRQSETMSB.
The tuner jumps to the selected frequency and sets the FRRFLAG when it is ready.
After this interrupt the TEA5764HN will not update the tuner registers for a period of
15 ms. The state of the TEA5764HN can be checked by reading registers: INTFLAG,
FRQCHKLSB, FRQCHKMSB, TNCTRL1 and TNCTRL2.
Table 4
shows the possible
states after a preset.
Table 4:
IFFLAG BLFLAG
0
Tuner truth table
[1]
FRRFLAG Comment
0
0
if pin INTX has gone LOW and only IFMSK, FRRMSK and
BLMSK were set then this cannot occur
channel found during search / preset; FRRMSK set
not a valid state
a valid channel found and the band limit has been reached
during a search; BLMSK or FRRMSK set
not a valid state
a preset or search has occurred but the wanted channel has a
valid RSSI level but fails the IF count when AHLSI was set to
logic 1; HLSI must be toggled and a new PLL value must be
programmed; FRRMSK set
not a valid state
band limit is reached during search; no valid channel found;
BLMSK or FRRMSK set
0
0
0
0
1
1
1
0
1
1
1
0
0
0
1
1
1
1
1
0
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA5764HN2GE | 制造商:STMicroelectronics 功能描述: |
| TEA5764UK | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FM radio + RDS |
| TEA5764UK/N2,027 | 功能描述:調(diào)諧器 FM RADIO WITH RDS RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| TEA5764UK-G | 功能描述:調(diào)諧器 FM RADIO WITH RDS RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| TEA5766UK/N1,023 | 功能描述:調(diào)節(jié)器/解調(diào)器 FM RADIO + RDS RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
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