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參數(shù)資料
| 型號： | TC90A58F |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件頁數(shù)： | 33/36頁 |
| 文件大?。?/td> | 439K |
| 代理商： | TC90A58F |
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TC90A58F
2002-02-06
6
No.
Pin Name
I/O
Function
Notes
72
CKSEL3
I
Clock select
73
CKSEL2
I
Clock select
74
CKSEL1
I
Clock select
75
CKSEL0
I
Clock select
Sets relationship between input H frequency and HPLL oscillation
frequency.
Also switches between internal oscillation frequency and external
clock input. When selecting clock using I
2
C bus register, set
CKSEL to all L.
76
RESN
I
Reset pin
H for normal operation, L for reset
77
CLAMP
I
Clamp pin
Input for ADC clamp signal. Polarity can be changed using I
2
C
bus register. By default, clamp is applied by H.
Switches between external input / internal generation of clamp
signal according to I
2
C Bus Register setting.
78
TES2
I
For testing purposes
Set to L.
79
TES1
I
For testing purposes
80
TES0
I
For testing purposes
TES1 and TES0 determine 2 least significant bits of I
2
C bus
control slave address (details are given later).
Functions
1.
Low-Pass Filter (LPF)
TC90A58F incorporates a low-pass filter (
3dB) for Y and C signals.
When the system clock is 27 MHz, cut-off frequency is 6 MHz for Y signal and 2.8 MHz for C signal.
When the system clock frequency is higher than 27 MHz, cut-off frequencies are determined as follows:
Example:
System clock frequency
= 29.82 MHz
Y signal cut-off frequency: 6 (MHz)
× (29.82 (MHz) ÷ 27 (MHz)) = approx. 6.63 MHz
Cb, Cr cut-off frequency: 2.8 (MHz)
× (29.82 (MHz) ÷ 27 (MHz)) = approx. 3.09 MHz
Low-pass filter characteristic for Y and C signals is shown below:
Y (RGB) Signal Cut-off Frequency
==== 6 MHz
Figure 1
Y Signal LPF Characteristic (system clock
==== 27 MHz)
5
0
75
70
65
60
35
30
50
55
45
40
5
0
20
25
15
10
2M
4M
6M
8M
10M
12M
(DC offset:
0.26)
[amp: dB]
CONV. TIM
May 10 1999
WAFP for DOS/V V1.3
*** copyright 1993, 94 by TOSHIBA [AVL] ***
[freq: Hz]
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