|
|
PDF JRC2267 Data sheet ( Hoja de datos )
| Número de pieza | JRC2267 | |
| Descripción | NJM2267 | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de JRC2267 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
|
No Preview Available !
NJM2267
DUAL VIDEO 6dB AMPLIFIER WITH 75Ω DRIVER
■ GENERAL DESCRIPTION
NJM2267 is a dual video 6dB amplifier with 75Ω drivers for S-VHS
VCRs, HI-BAND VCRs, etc..Each channel has clamp function that
fixes DC level of video signal and 75Ω drivers to be connected to TV
monitors directly. Further more it has sag corrective circuits that
prevent the generation of sag with smaller capacitance than ever.
Its operating supply voltage is 4.85 to 9V and bandwidth is 7MHz.
■ FEATURES
● Wide Operating Voltage (4.85V to 9.0V)
● Dual Channel
● Internal Clamp Function
● Internal Driver Circuit For 75Ω Load
● SAG Corrective Function
● Wide Frequency Range (7MHz)
● Low Operating Current 14.0mA (Dual)
● Package Outline DIP8, DMP8, SSOP8
● Bipolar Technology
■ APPLICATIONS
●VCR, Video Camera, TV, Video Disc Player.
■ BLOCK DIAGRAM
■ PACKAGE OUTLINE
NJM2267D
NJM2267M
NJM2267V
Ver.2012-01-16
-1-
1 page  
NJM2267
♦Clamp circuit
1. Operation of Sync-tip-clamp
Input circuit will be explained. Sync-tip clamp circuit (below the clamp circuit) operates to keep a sync tip of the minimum
potential of the video signal. Clamp circuit is a circuit of the capacitor charging and discharging of the external input Cin. It is
charged to the capacitor to the external input Cin at sync tip of the video signal. Therefore, the potential of the sync tip is fixed.
And it is discharged charge by capacitor Cin at period other than the video signal sync tip. This is due to a small discharge
current to the IC.
In this way, this clamp circuit is fixed sync tip of video signal to a constant potential from charging of Cin and discharging of
Cin at every one horizontal period of the video signal.
The minute current be discharged an electrical charge from the input capacitor at the period other than the sync tip of video
signals. Decrease of voltage on discharge is dependent on the size of the input capacitor Cin.
If you decrease the value of the input capacitor, will cause distortion, called the H sag. Therefore, the input capacitor
recommend on more than 0.1uF.
signal input
charge
Cin current
Vin
diccharge
current
< Clamp circuit >
Clamp circuit
A. Cin is large
B. Cin is small (H sag experience)
clamp potential
charge period
discharge period
charge period charge period
clamp potential
discharge period
charge period
< Waveform of input terminal >
2. Input impedance
The input impedance of the clamp circuit is different at the capacitor discharge period and the charge period.
The input impedance of the charging period is a few kΩ. On the other hand, the input impedance of the discharge period is
several MΩ. Because is a small discharge-current through to the IC.
Thus the input impedance will vary depending on the operating state of the clamp circuit.
3. Impedance of signal source
Source impedance to the input terminal, please lower than 200Ω. A high source impedance, the signal may be distorted. If
so, please to connect a buffer for impedance conversion.
Ver.2012-01-16
-5-
5 Page 
NJM2267
< Using SAG correction circuit >
Csag=10uF, Input signal: Black to White100%, resistance150Ω
Waveform: yellow: input signal, green: Vout signal, purple: Vout1signal, red: clip length of waveform
Vcc=5.0V
Vcc=7.0V
Vcc=9.0V
Ver.2012-01-16
- 11 -
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet JRC2267.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| JRC2267 | NJM2267 | New Japan Radio |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |