NXP Semiconductors TDA8752B Manual de usuario descargar pdf

TDA8752B

Triple high-speed Analog-to-Digital Converter 110 Msps

Rev. 03 — 21 July 2000 Product speciﬁcation

1. General description

The TDA8752B is a triple 8-bit ADC with controllable ampliﬁers and clamps for the

digitizing of large bandwidth RGB signals.

The clamp level, the gain and all other settings are controlled via a serial interface

(either I

C-bus or 3-wire serial bus, selected via a logic input).

The IC also includes a PLL that can be locked to the horizontal line frequency and

generates the ADC clock. The PLL jitter is minimized for high resolution PC graphics

applications. An external clock can also be input to the ADC.

It is possible to set the TDA8752B serial bus address to four different values, when

several TDA8752B ICs are used in a system, by means of the I

C-bus interface (for

example, two ICs used in an odd/even conﬁguration).

2. Features

■ Triple 8-bit ADC

■ Sampling rate up to 110 Msps

■ IC controllable via a serial interface, which can be either I

C-bus or 3-wire serial

bus, selected via a TTL input pin

■ IC analog voltage input from 0.4 to 1.2 V (p-p) to produce a full-scale ADC input of

1 V (p-p)

■ Three clamps for programming a clamping code between −63.5 and +64 in steps

⁄

LSB for RGB signals, and from +120 to +136 in steps of

⁄

LSB for YUV

signals

■ Three controllable ampliﬁers: gain controlled via the serial interface to produce a

full-scale resolution of

⁄

LSB peak-to-peak

■ Ampliﬁer bandwidth of 250 MHz

■ Low gain variation with temperature

■ PLL controllable via the serial interface to generate the ADC clock which can be

locked to a line frequency of 15 to 280 kHz

■ Integrated PLL divider

■ Programmable phase clock adjustment cells

■ Internal voltage regulators

■ TTL compatible digital inputs and outputs

■ Chip enable high-impedance ADC output

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