Os motores de busca de Datasheet de Componentes eletrônicos |
|
TSA5521T Folha de dados(PDF) 4 Page - NXP Semiconductors |
|
TSA5521T Folha de dados(HTML) 4 Page - NXP Semiconductors |
4 / 24 page 1996 Oct 10 4 Philips Semiconductors Product specification 1.3 GHz universal bus-controlled TV synthesizer TSA5520; TSA5521 Table 1 Differences between TSA5520 and TSA5521 Notes 1. The selection of the reference divider is given by an automatic identification of the data word length. 2. The reference divider is set to 640 at power-on reset. TYPE NUMBER DATA WORD REFERENCE DIVIDER FREQUENCY STEP (kHz) TSA5520 18-bit 512(1) 62.5 TSA5520 19-bit 1024(1) 31.25 TSA5521 18-bit or 19-bit 640(2) 50 The device has three independent I2C-bus addresses which can be selected by applying a specific voltage on the CE input (see Table 5). The general address C2 is always valid. When the I2C-bus format is fully used, TSA5520 and TSA5521 are equal. 3-wire bus format (SW = VCC1 or open-circuit) Data is transmitted to the device during a HIGH level on the CE input (enable line pin 15). The device is compatible with 18-bit and 19-bit data formats. The first four bits are used to program the PNP band switch buffers and the remaining bits are used to control the programmable divider. A 27-bit data format may also be used to set the charge-pump current, the reference divider ratio and for test purposes. The difference between TSA5520 and TSA5521 are given in Table 1. When the 27-bit format is used, the TSA5520 and TSA5521 are equal and the reference divider is controlled by the RSA and RSB bits (see Table 7). More details are given in Chapter “Functional description” Section “3-wire bus mode (SW = open-circuit or VCC1); see Figs 3, 4 and 5”. GENERAL DESCRIPTION The device is a single-chip PLL frequency synthesizer designed for TV and VCR tuning systems. The circuit consists of a divide-by-eight prescaler with its own preamplifier, a 15-bit programmable divider, a crystal oscillator and its programmable reference divider and a phase/frequency detector combined with a charge-pump which drives the tuning amplifier and the 33 V output. Four high-current PNP band switch buffers are provided for band switching. Two PNP buffers can be switched on simultaneously. The sum of the collector currents is limited to 50 mA. Depending on the reference divider ratio (512, 640 or 1024), the phase comparator operates at 3.90625 kHz, 6.25 kHz or 7.8125 kHz using a 4 MHz crystal. The lock detector output is LOW when the PLL loop is locked. In the test mode, this output is used as a test output for fref and 1/2fdiv (see Table 6). The device can be controlled in accordance with the I2C-bus format or the 3-wire bus format depending on the voltage applied to the SW input (see Table 2). I2C-bus format (SW = LOW) Five serial bytes (including address byte) are required to address the device, select the VCO frequency, program the four PNP band switch buffers, set the charge-pump current and the reference divider ratio. |
Nº de peça semelhante - TSA5521T |
|
Descrição semelhante - TSA5521T |
|
|
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 |