參數(shù)資料
型號(hào): TEF6700HL
廠商: NXP SEMICONDUCTORS
元件分類: 調(diào)諧器
英文描述: Car radio tuner front-end for digital IF
中文描述: AUDIO TUNER, PQFP64
封裝: 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, SOT-314-2, MS-026, LQFP-64
文件頁(yè)數(shù): 29/56頁(yè)
文件大小: 305K
代理商: TEF6700HL
2003 Oct 21
29
Philips Semiconductors
Product specification
Car radio tuner front-end for digital IF
TEF6700HL
handbook, full pagewidth
MHC520
audio output of a
car IF DSP IC
(e.g. SAA7724H)
t1
t2
AF channel
AF = 1
main channel
AF = 1
t3
t4
I
2
C-bus
AFHOLD
AFSAMPLE
(internal)
load PLL
quality test
0
1
2
3
4
5
6
7
8
t (ms)
Fig.6 Inaudible AF update timing diagram.
AFHOLD signal is used to hold the quality information for signal processing of the main channel during the alternative frequency jumps. PLL registers
are loaded during load PLL = 1, but actual frequency jumps take place at the falling edge of this signal. IF counting is carried out during AFSAMPLE = 1.
10
μ
s after falling edge of AFSAMPLE result is valid for AF and remains valid until read by microcontroller. Quality tests in a car IF DSP IC (e.g.
SAA7724H) should take place 2 ms after falling edge of AFHOLD.
t
1
is the internal TEF6700HL clock related logic delay: 100
μ
s.
t
2
should be >1.1 ms to ensure correct loading of PLL for the main channel.
t
3
should be >0 to ensure inaudible update.
t
4
= 500
μ
s.
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