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| 型號(hào)： | 935205860118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1400 MHz, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, SSOP-20 |
| 文件頁(yè)數(shù)： | 14/23頁(yè) |
| 文件大?。?/td> | 257K |
| 代理商： | 935205860118 |
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TSA5523M
Information as of 2000-08-19
TSA5523M; 1.4 GHz I2 C-bus controlled multimedia synthesizer
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, a
phase/frequency detector combined with a charge-pump which drives the tuning amplifier, including 33 V output. Three NPN open-collector
outputs are provided for band switching together with five open-collector NPN outputs. Four of these ports can also be used as input ports
(one ADC and three general purpose I/O ports).
An output is provided to control a Philips mixer/oscillator IC controlled by bits P7, P5 and P4. Depending on the reference divider ratio (512,
640 or 1024), the phase comparator operates at 3.90625, 6.25 or 7.8125 kHz with a 4 MHz crystal.
The lock detector bit FL is set to logic 1 when the loop is locked and is read on the SDA line (status byte) during a read operation. The ADC
is available for digital AFC control. The ADC code is read during a read operation on the I2C-bus. The ADC input is combined with the port
P6. In the test mode, this port is also used as a test output for fref and fdiv/2 .In addition, the circuit includes a DC/DC converter driver
connected to the IDC pin to control the amplitude of an external oscillator followed by a voltage rectifier.
The voltage rectifier is used to generate the correct tuning supply voltage to maintain a constant current into the tuning amplifier. The
DC/DC converter driver can be disabled by setting the IDC pin to V
CC1 in this event the tuning supply voltage is delivered by a fixed 33 V
supply.
Five serial bytes (including address byte) are required to address the device, select the VCO frequency, program the ports, set the charge-
pump current and set the reference divider ratio. The device has four independent I2C-bus addresses which can be selected by applying a
specific voltage on the AS input .
l
Complete 1.4 GHz single-chip system
l
Adaptive DC/DC converter driver output
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