TDA8787 datasheet(2/20 Pages) PHILIPS

2 / 20 page

1998 Oct 15

Philips Semiconductors

Preliminary speciﬁcation

10-bit, 3.0 V analog-to-digital interface for

CCD cameras

TDA8787

FEATURES

• Correlated Double Sampling (CDS), Automatic Gain

Control (AGC), 10-bit Analog-to-Digital Converter (ADC)

and reference regulator included

• Fully programmable via a 3-wire serial interface

• Sampling frequency up to 18 MHz

• AGC gain range of 36 dB (in steps of 0.1 dB)

• Low power consumption of only 190 mW (typ.)

• Power consumption in standby mode of 4.5 mW (typ.)

• 3.0 V operation and 2.5 to 3.6 V operation for the digital

outputs

• Active control pulses polarity selectable via serial

interface

• 8-bit DAC included for analog settings

• TTL compatible inputs, CMOS compatible outputs.

APPLICATIONS

• Low-power, low-voltage CCD camera systems.

GENERAL DESCRIPTION

The TDA8787 is a 10-bit analog-to-digital interface for

CCD cameras. The device includes a correlated double

sampling circuit, AGC and a low-power 10-bit ADC

together with its reference voltage regulator.

AGC gain is controlled via the serial interface.

The ADC input clamp level is controlled via the serial

interface.

An additional DAC is provided for additional system

controls; its output voltage range is 1.0 V (p-p) which is

available at pin OFDOUT.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

VCCA

analog supply voltage

2.7

3.0

3.6

VCCD

digital supply voltage

2.7

3.0

3.6

VCCO

digital outputs supply voltage

2.5

2.6

3.6

ICCA

analog supply current

all clamps active

−

ICCD

digital supply current

−

811

ICCO

digital outputs supply current

fpix = 18 MHz; CL =20pF;

input ramp response time is 800

µs

−

12mA

ADCres

ADC resolution

−

bits

Vi(CDS)(p-p)

maximum CDS input voltage

(peak-to-peak value)

VCC = 2.85 V

650

−−

VCC ≥ 3.0 V

800

−−

fpix(max)

maximum pixel rate

−−

MHz

fpix(min)

minimum pixel rate

−−

MHz

DRAGC

AGC dynamic range

−

Ntot(rms)

total noise from CDS input to

ADC output

AGC gain = 0 dB; see Fig.8

−

0.25

−

LSB

Ptot

total power consumption

VCCA =VCCD =VCCO =3V

−

190

−

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TDA8787HL

LQFP48

plastic low proﬁle quad ﬂat package; 48 leads; body 7

× 7 × 1.4 mm

SOT313-2

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