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PDF NJW1508 Data sheet ( Hoja de datos )
| Número de pieza | NJW1508 | |
| Descripción | (NJW1504 / NJW1508) Others / SSOP16 | |
| Fabricantes | JRC | |
| Logotipo |  |
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NJW1504/1508
www.DataSheet4U.com
PLL Synthesizer with I2C Bus for TV Tuner
n DESCRIPTION
The NJW1504/1508 are a PLL frequency synthesizer especially
designed for TV and VCR tuning systems and consists of PLL circuit
and a prescaler which operates up to 1.0GHz, built into one chip.
The NJW1504/1508 are controlled through an I2C-bus.
n FEATURES
• Operating Voltage 5V
• Low Operating Current : 15mA typ. @Vcc=5V
• Prescaler accepts frequencies up to 1GHz on chip
• Reference Signal :
NJW1504: Reference Signal Oscillator with peripheral of Xtal on chip
NJW1508: Buffer Amplifier for External Reference Signal on chip
• 34V max. tuning voltage output
• Package Outline: SSOP16
n PACKAGE OUTLINE
NJW1504V/NJW1508V
n BLOCK DIAGRAM
BS0-BS3
VCC3
VCC1
5V GND
BAND SW
4bit
4bit
Latch
I2C
BRuesceive
r
HF IN
CP
VCC2
PreAMP
1/8
Programmable
Divider 15bit
AMPOUT
AMP
Phase
OUT
Phase
Comp.
15bit
Latch
8bit
Latch
1/1024
1/512
(1/640)
Ref.
Divider
X’tal
OSC
ADRS
SDA
SCL
OSCOUT
XTAL
(Note)
Purchase of I2C components of New Japan RadioCo.,Ltd or one of its sublicensed Associated Companies conveys a license
under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C
standard specification as definedby by Philips.
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NJW1504/1508
n I2C bus Protocols
The input information, which consists of chip address and next two or four byte data, is received by I2C bus
receiver. The allowable I2C bus protocols are as follows.
(1) STA CA CB BB STO
(2) STA CA D1 D2 STO
(3) STA CA CB BB D1 D2 STO
(4) STA CA D1 D2 CB BB STO
STA: Start Condition
STO: Stop Condition
CA: Chip Address
CB: Control Byte
BB: Band switch Byte
D1: Divider Byte 1
D2: Divider Byte 2
For suitable circuit operation,5-byte data should have chip address, 2-byte control data, band data, and 2-byte
divider byte. Following chip address. 2-byte data is received. For distinction of each data, first and third data
byte has a function bit. As function bit, divider byte has “1”and control/band data has “0”.
SDA
SCL
STA
1-7 8
A D D R E S S R/W
9
ACK
1 -7
DATA
8
9
ACK
9
ACK
STO
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5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet NJW1508.PDF ] | |
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