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TDA8754H Scheda tecnica(PDF) 2 Page - NXP Semiconductors

Il numero della parte TDA8754H
Spiegazioni elettronici  Triple high speed ADC for LCD drive
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Produttore elettronici  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8754H Scheda tecnica(HTML) 2 Page - NXP Semiconductors

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1998 Sep 30
2
Philips Semiconductors
Objective specification
Triple high speed ADC for LCD drive
TDA8754
FEATURES
• Triple 8-bit Analog-to-Digital Converter (ADC)
• Sampling rate up to 170 MHz
• IC controllable via a serial interface, which can be either
I2C-bus or 3-wire, selected via a TTL input pin
• IC analog input 0.5 to 1.1 V (peak-to-peak value) to
have full-scale ADC input
• Clamps for programming a clamp level through a
clamping code between
−63 and +64 by steps of 1 LSB
• Controllable gain stages: gain controlled independently
on the 3 channels via the serial interface to have a
full-scale resolution to 1%
• Low gain variation at different temperatures
• Analog bandwidth of 400 MHz
• Controllable PLL via the serial interface generates the
ADC clock. It can be locked on line frequencies from
15 kHz up to 280 kHz.
• Integrated PLL divider
• Integrated clamp pulse and H and V LCD control pulses
generation (independently adjustable in position and
duration). Also a data enable signal can be generated,
independently adjustable in position and duration with
respect to HSYNC.
• The pixel clock is available at half the clock frequency
• Programmable phase clock adjustment cells
• Internal voltage regulators
• TTL compatible digital inputs
• 3.3 V CMOS compatible digital outputs
• Outputs: one port output up to 140 MHz or 2-port
demultiplexed outputs on the full speed range.
Operating mode selectable through the serial interface.
• Chip enable: high-impedance ADC output
• Power-down mode.
GENERAL DESCRIPTION
The TDA8754 is a triple 8-bit ADC with controllable gain
and clamps for the digitizing of large bandwidth
R, G, B signals. Clamp level, gain, and all the other
settings are controlled via a serial interface (either I2C-bus
or 3-wire, selected through a logic input). The gain is
optimized for stability versus temperature variations.
The IC also includes a PLL that generates the ADC clock
which can be locked to the horizontal line frequency.
The PLL jitter is minimized for high resolution PC graphics
applications. An external clock can also be used to clock
the ADC.
The clamp pulse is generated on-chip, it can be adjusted
in position (with respect to HSYNC) and duration through
the serial interface.
The horizontal and vertical control pulses for the LCD can
be adjusted in duration through the serial interface. Also a
data enable signal can be generated, independently
adjustable in position (with respect to HSYNC) and
duration through the serial interface.
Outputs: one port output up to 140 MHz or demultiplexed
2-port outputs on the full speed range. Operating mode
selectable through the serial interface.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA8754H
LQFP144
plastic low profile quad flat package; 144 leads; body 20
× 20 × 1.4 mm
SOT486-1


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