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參數(shù)資料
| 型號： | VTSH6UZ60 |
| 廠商： | Sharp Corporation |
| 英文描述： | Internal-PLL Electronic Tuners(內部鎖相環(huán)電子調諧器) |
| 中文描述： | 內部鎖相環(huán)電子調諧器（內部鎖相環(huán)電子調諧器） |
| 文件頁數(shù)： | 1/2頁 |
| 文件大?。?/td> | 30K |
| 代理商： | VTSH6UZ60 |
VTSH Series
RF Application Note
Internal-PLL Electronic Tuners
Tuners Using the Motorola
MC44817D Phase-Locked Loop
SHARP Electronics Corporation, Microelectronics Group, RF Products Marketing Group, 360-834-2500
OVERVIEW
This Application Note covers VTSH-series tuners
which utilize the Motorola
MC44817D Phase-Locked-
Loop (PLL) Integrated Circuits (ICs). All of the Sharp
products covered here are useful for Television, Video
Cassette Recorders, Multimedia, or other similar
applications that require a first-conversion stage.
INTRODUCTION
SHARP’s VTSH series of tuners use the same
Motorola PLL IC for a variety of tuner application
types. These tuners operate in similar manner, with
variations dependent on the destination country. All the
PLL devices are programmed in a similar manner, with
the frequency step dependent on the application.
VTSH Series
Table 1. PLL Specifications
TUNER PART
NUMBER
TYPE
CRYSTAL
REFERENCE
FREQUENCY
4 MHz
4 MHz
3.2 MHz
4 MHz
STEP SIZE
VTSH6UZ60
VTSH7UZ50
VTSH6HZF1
VTSH7UF56
NTSC
NTSC
PAL 5.5
NTSC
62.5 kHz
62.5 kHz
50 kHz
62.5 kHz
The VTSH series of tuners are PLL-tuned and cover
the VHF and UHF frequency bands. A total of 181
standard North American NTSC-M channels are within
the 55.25 MHz to 801.25 MHz tune range of the
VTSH6UZ60, VTSH7UZ50, and VTSH7UF56 models.
The VTSH7UF56 has an F-connector input instead of
the standard RCA connector. Channels in the Stand-
ard, HRC, and IRC frequency plans can be tuned with
these products. The VTSH6HZF1 has an RCA input
and is appropriate for reception of signals modulated
in the PAL formats that use a 5.5 MHz intercarrier. It
covers the 48.25 MHz to 855.25 MHz range. Other
variations of PLL tuners and off-air non-PLL tuners are
available for a variety of destination countries.
MC44817D
The MC44817D is a surface mount version of the
MC44807P (DIP) PLL IC. It uses an 18-bit serial data
string for configuring the PLL. The specification de-
fines a variety of possible operating configurations;
however, the specific conditions for these tuners will
be discussed.
The computation for the required N-count to load
the PLL is very simple.
N = F
OSC
/ Step Size (1)
As indicated in Table 1, the step size is predeter-
mined for each application and is a constant in the
equation. The (1) indicates that it is equation 1 in this
document. The Voltage Controlled Oscillator (VCO)
output frequency term F
OSC
is determined by the output
from the PLL IC. F
OSC
is determined by:
F
OSC
= F
CHANNEL
+ F
IF
(2)
where F
CHANNEL
is the channel to which you want to
tune, and F
IF
is the standard 45.75 MHz inverted IF as
referenced to the video carrier. As an example of the
above expression, we will tune to Channel 2, with the
video carrier at 55.25 MHz.
F
OSC
= 55.25 MHz + 45.75 MHz = 101 MHz (3)
The required VCO frequency to tune NTSC-M
Channel 2, which is at 55.25 MHz, referenced to the
video carrier, is 101 MHz. The Intermediate Frequency
(IF) output for the NTSC tuners is 45.75 MHz. As part
of the conversion process, the VCO is the conversion
Local Oscillator (LO), and is tuned above the desired
frequency by an amount equal to the IF. Thus 101 MHz
– 55.25 MHz = 45.75 MHz produces the desired IF
output frequency. For a given channel frequency, add
45.75 MHz, and the required VCO frequency will re-
sult.
Determine the N-count for the above channel by:
N = F
OSC
/ Step Size (1)
N = 101 MHz / 62.5 kHz = 1616 (4)
The derived value of 1616 is the decimal value that
will be loaded into the PLL to set F
OSC
at 101 MHz. The
maximum N-count allowed is 16,363 and a minimum
count of 17.
RF Application Note
Page 1
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