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TDA6650TT 数据表(PDF) 2 Page - NXP Semiconductors |
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TDA6650TT 数据表(HTML) 2 Page - NXP Semiconductors |
2 / 54 page TDA6650TT_6651TT_5 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 05 — 10 January 2007 2 of 54 NXP Semiconductors TDA6650TT; TDA6651TT 5 V mixer/oscillator and low noise PLL synthesizer Five open-drain PMOS ports are included on the IC. Two of them, BS1 and BS2, are also dedicated to the selection of the low, mid and high bands. PMOS port BS5 pin is shared with the ADC. The AGC detector provides a control that can be used in a tuner to set the gain of the RF stage. Six AGC take-over points are available by software. Two programmable AGC time constants are available for search tuning and normal tuner operation. The local oscillator signal is fed to the fractional-N divider. The divided frequency is compared to the comparison frequency into the fast phase detector which drives the charge pump. The loop amplifier is also on-chip, including the high-voltage transistor to drive directly the 33 V tuning voltage without the need to add an external transistor. The comparison frequency is obtained from an on-chip crystal oscillator. The crystal frequency can be output to the XTOUT pin to drive the clock input of a digital demodulation IC. Control data is entered via the I2C-bus; six serial bytes are required to address the device, select the Local Oscillator (LO) frequency, select the step frequency, program the output ports and set the charge pump current or select the ALBC mode, enable or disable the crystal output buffer, select the AGC take-over point and time constant and/or select a specific test mode. A status byte concerning the AGC level detector and the ADC voltage can be read out on the SDA line during a read operation. During a read operation, the loop ‘in-lock’ flag, the power-on reset flag and the automatic loop bandwidth control flag are read. The device has 4 programmable addresses. Each address can be selected by applying a specific voltage to pin AS, enabling the use of multiple devices in the same system. The I2C-bus is fast mode compatible, except for the timing as described in the functional description and is compatible with 5 V, 3.3 V and 2.5 V microcontrollers depending on the voltage applied to pin BVS. 2. Features I Single-chip 5 V mixer/oscillator and low phase noise PLL synthesizer for TV and VCR tuners, dedicated to hybrid (digital and analog) as well as pure digital applications (DVB-T) I Five possible step frequencies to cope with different digital terrestrial TV and analog TV standards I Eight charge pump currents between 40 µA and 600 µA to reach the optimum phase noise performance over the bands I Automatic Loop Bandwidth Control (ALBC) sets the optimum phase noise performance for DVB-T channels I I2C-bus protocol compatible with 2.5 V, 3.3 V and 5 V microcontrollers: N Address + 5 data bytes transmission (I2C-bus write mode) N Address + 1 status byte (I2C-bus read mode) N Four independent I2C-bus addresses. I Five PMOS open-drain ports with 15 mA source capability for band switching and general purpose; one of these ports is combined with a 5-step ADC I Wideband AGC detector for internal tuner AGC: |
类似零件编号 - TDA6650TT |
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类似说明 - TDA6650TT |
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