 |
Os motores de busca de Datasheet de Componentes eletrônicos |
|
|
Os motores de busca de Datasheet de Componentes eletrônicos |
|
TDA9103 Folha de dados(PDF) 11 Page - STMicroelectronics |
|
||||||||||||||||||||||||||||||
TDA9103 Folha de dados(HTML) 11 Page - STMicroelectronics |
|
|
11 / 27 page  VREF 10k Ω 22k Ω DC Control Voltage 10k Ω Figure 5 : Example of Practical DC Control Voltage Generation Z T Z Figure 6 1.6V HSYNC Figure 7 : Input Structure OPERATING DESCRIPTION GENERAL CONSIDERATIONS Power Supply The typical value of the power supply voltage VCC is 12V. Perfect operation is obtained if VCC is main- tained in the limits : 10.8V → 13.2V. In order to avoid erratic operation of the circuit during the transient phase of VCC switching on, or switching off, the value of VCC is monitored and the outputs of the circuit are inhibited if it is too low. In order to have a very good power supply rejection, the circuit is internally powered by several internal voltage references (The unique typical value of which is 8V). Two of these voltage references are externally accessible, one for the vertical part and one for the horizontal part. These voltage refer- ences can be used for the DC control voltages applied on the concerned pins by the way of poten- tiometers or digital to analog converters (DAC’s). Furthermore it is possible to filter the a.m. voltage references by the use of external capacitor con- nected to ground, in order to minimize the noise and consequently the ”jitter” on vertical and hori- zontal output signals. DC Control Adjustments The circuit has 10 adjustment capabilities : 3 for the horizontal part, 1 for the SMPS part, 2 for the E/W correction, 4 for the vertical part. The corresponding inputs of the circuit has to be driven with a DC voltage typically comprised be- tween 2 and 6V for a value of the internal voltage reference of 8V. More precisely, the control voltages have to be maintained between VREF/4 and 3/4 ⋅ VREF. The application of control voltages outside this range is not dangerousfor the circuit but the good operation is not guaranted (except for Pin 2 : duty cycle adjusment. See outputs inhibition paragraph). The input currents of the DC control inputs are typically very low (about a few µA). Depending on the internal structure of the inputs, the input cur- rents can be positive or negative (sink or source). HORIZONTAL PART Input section The horizontal input is designed to be sensitive to TTL signals typically comprised between 0 and 5V. The typical threshold of this input is 1.6V. This input stage uses an NPN differential stage and the input current is very low. Concerning the duty cycle of the input signal, the following signals may be applied to the circuit. Using internal integration, both signals are recog- nized on condition that Z/T ≤ 25%. Synchronisation occurs on the leading edge of the rectified signal. The minimum value of Z is 0.7 µs. PLL1 The PLL1 is composed of a phase comparator, an external filter and a Voltage Controlled Oscillator (VCO). The phase comparatoris a ”phase frequency” type, designed in CMOS technology. This kind of phase detector avoids locking on false frequencies. It is followed by a ”charge pump”, composed of 2 cur- rent sources sink and source (I = 1mA typ.) TDA9103 11/27 |
Nº de peça semelhante - TDA9103 |
|
Descrição semelhante - TDA9103 |
|
|
Ligação URL |
| Privacy Policy |
| ALLDATASHEETPT.COM |
| ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Portuguese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
