Philips tda8755 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA8755

YUV 8-bit video low-power
analog-to-digital interface

Product specification
Supersedes data of June 1994
File under Integrated Circuits, IC02

Philips Semiconductors

1995 Mar 09

Philips Semiconductors Product specification

YUV 8-bit video low-power
analog-to-digital interface

FEATURES

• 8-bit resolution

• Sampling rate up to 20 MHz

• TTL compatible digital inputs

• 3-state TTL outputs

• U, V two's complement outputs

• Y binary output

• Power dissipation of 550 mW (typical)

• Low analog input capacitance, no buffer amplifier

required

• High signal-to-noise ratio over a large analog input
frequency range

• Track-and-hold included

• Clamp functions included

• UV multiplexed ADC

• 4:1:1 output data encoder

• Stable voltage regulator included.

TDA8755

APPLICATIONS

• High speed analog-to-digital conversion for video signal
digitizing

• 100 Hz improved definition TV (IDTV).

GENERAL DESCRIPTION

The TDA8755 is a bipolar 8-bit video low-power
analog-to-digital conversion (ADC) interface for YUV
signals. The device converts the YUV analog input signal
into 8-bit coded digital words in a 4 : 1 : 1 format at a
sampling rate of 20 MHz. The U/V signals are converted in
a multiplexed manner. All analog signal inputs are digitally
clamped and a fast precharge is provided for start-up.
All digital inputs and outputs are TTL compatible. Frame
synchronization is supported in a multiplexed manner.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CCA

V

CCD

V

CCO

I

CCA

I

CCD

I

CCO

INL DC integral non-linearity f
DNL DC differential non-linearity f

analog supply voltage 4.75 5.0 5.25 V
digital supply voltage 4.75 5.0 5.25 V
output stages supply voltage 4.75 5.0 5.25 V
analog supply current − 46 55 mA
digital supply current − 55 66 mA
output stages supply current − 912mA

= 2 MHz −±0.4 ±1 LSB

clk

= 2 MHz −±0.3 ±0.5 LSB

clk

EB effective bits − 7.1 − bits
f

clk(max)

P

tot

maximum clock frequency 20 −−MHz
total power dissipation − 550 700 mW

ORDERING INFORMATION

PACKAGE

TYPE NUMBER

PINS PIN POSITION MATERIAL CODE

TDA8755T 32 SO32L plastic SOT287-1

1995 Mar 09 2

Philips Semiconductors Product specification

YUV 8-bit video low-power
analog-to-digital interface

BLOCK DIAGRAM

2413

REG1 REG2 REG3

Y

D0

D7

8

24

31

TTL

I / O

8

8-BIT

PIPELINE

8

ADC

8-BIT

CLK

CE

HREF

17

14

16

TIMING GENERATOR

V

D'0

D'1

2

192021

TTL

U AND V

8

8-BIT

U

D'2

D'3

2

22

I / O

DATA

ENCODER

ADC

TDA8755

MLA734 - 1

TDA8755

CCO AGND DGND SDN n.c.

V

CCD

V

6 322310188 1

CCA

V

AND

HOLD

TRACK

Y

CLAMP

VOLTAGE REGULATOR

SUPPLY AND REFERENCE

5

3

16

COMPARATOR

LOGIC

CLAMP

15

TRACK

7

AND

HOLD

AND

HOLD

TRACK

ANALOG

MULTIPLEXER

DIGITAL

MULTIPLEXER

CLAMPUCLAMP

11

V

12

128

COMPARATOR

AND

HOLD

TRACK

9

handbook, full pagewidth

Fig.1 Block diagram.

1995 Mar 09 3

INY

CLPY

CLP

INU

CLPU

CLPV

INV

Philips Semiconductors Product specification

YUV 8-bit video low-power
analog-to-digital interface

PINNING

SYMBOL PIN DESCRIPTION

n.c. 1 not connected
REG1 2 decoupling input (internal

stabilization loop decoupling)
INY 3 Y analog voltage input
REG2 4 decoupling input (internal

stabilization loop decoupling)
CLPY 5 Y clamp capacitor connection
V

CCA

INU 7 U analog voltage input
SDN 8 stabilizer decoupling node and

INV 9 V analog voltage input
AGND 10 analog ground
CLPU 11 U clamp capacitor connection
CLPV 12 V clamp capacitor connection
REG3 13 decoupling input (internal

CE 14 chip enable input (TTL level input

CLP 15 clamp control input
HREF 16 horizontal reference signal
CLK 17 clock input
DGND 18 digital ground
D'0 19 V data output; bit 0 (n−1)
D'1 20 V data output; bit 1 (n)
D'2 21 U data output; bit 0 (n−1)
D'3 22 U data output; bit 1 (n)
V

CCO

D0 24 Y data output; bit 0 (LSB)
D1 25 Y data output; bit 1
D2 26 Y data output; bit 2
D3 27 Y data output; bit 3
D4 28 Y data output; bit 4
D5 29 Y data output; bit 5
D6 30 Y data output; bit 6
D7 31 Y data output; bit 7 (MSB)
V

CCD

6 analog positive supply voltage

(+5 V)

analog reference voltage (+3.35 V)

stabilization loop decoupling)

active LOW)

23 positive supply voltage for output

stages (+5 V)

32 digital positive supply voltage (+5 V)

handbook, halfpage

1

n.c.

2

REG1

INY

3

REG2

4
5

CLPY

V

CCA

6

INU

7

SDN

8

INV

AGND

CLPU
CLPV
REG3

CE

CLP

HREF CLK

TDA8755

9
10
11
12

13
14
15
16

MLA728 - 1

V

32
31

D7
D6

30

D5

29
28

D4
D3

27

D2

26

D1

25

D0

24

V

23

D'3

22

D'2

21

D'1

20
19

D'0

18

DGND

17

Fig.2 Pin configuration.

TDA8755

CCD

CCO

1995 Mar 09 4

Philips Semiconductors Product specification

YUV 8-bit video low-power

TDA8755

analog-to-digital interface

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CCA

V

CCD

V

CCO

∆V

V

I

V

clk(p-p)

I

O

T

stg

T

amb

T

j

CC

analog supply voltage −0.3 +7.0 V
digital supply voltage −0.3 +7.0 V
output stages supply voltage −0.3 +7.0 V
supply voltage difference between V
supply voltage difference between V
supply voltage difference between V

CCA
CCO
CCA

and V

and V

and V

CCD

CCD

CCO

−1.0 +1.0 V

−1.0 +1.0 V

−1.0 +1.0 V

input voltage referenced to AGND − +5.0 V
AC input voltage for switching (peak-to-peak value) referenced to DGND − V

CCD

V
output current − +6 mA
storage temperature −55 +150 °C
operating ambient temperature 0 +70 °C
junction temperature − +150 °C

HANDLING

Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling integrated circuits.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

R

th j-a

thermal resistance from junction to ambient in free air 70 K/W

1995 Mar 09 5

Philips Semiconductors Product specification

YUV 8-bit video low-power

TDA8755

analog-to-digital interface

CHARACTERISTICS

V

CCA=V6

AGND and DGND shorted together; V
V

CCA

T

amb

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

CCA

V

CCD

V

CCO

I

CCA

I

CCD

I

CCO

Inputs

CLK (
V

IL

V

IH

I

IL

I

IH

Z

I

C

I

CE, CLP AND HREF (PINS 14 TO 16)
V

IL

V

IH

I

IL

I

IH

CLPY (PIN 5)
V

5

I

5

CLPU AND CLPV (PINS 11 AND 12)
V

11, 12

I

11, 12

INY (PIN 3)
V

I(p-p)

Z

I

C

I

to V10= 4.75 to 5.25 V; V

to V

= −0.25 to +0.25 V; T

CCO

CCD=V32

CCA

= 0 to +70 °C; typical values measured at V

amb

=25°C; unless otherwise specified.

analog supply voltage 4.75 5.0 5.25 V
digital supply voltage 4.75 5.0 5.25 V
output stages supply voltage 4.75 5.0 5.25 V
analog supply current − 46 55 mA
digital supply current − 55 66 mA
output stages supply current − 912mA

PIN 17)

LOW level input voltage 0 − 0.8 V
HIGH level input voltage 2.0 − V
LOW level input current V
HIGH level input current V
input impedance f
input capacitance f

LOW level input voltage 0 − 0.8 V
HIGH level input voltage 2.0 − V
LOW level input current V
HIGH level input current V

clamp voltage for 16 output code − 3.725 − V
clamp output current −±50 −µA

clamp voltage for 128 output code − 3.30 − V
clamp output current −±50 −µA

input voltage, full range
(peak-to-peak value)

input impedance fi= 6 MHz − 30 − kΩ
input capacitance fi= 6 MHz − 1 − pF

to V18= 4.75 to 5.25 V; V

to V

= −0.25 to +0.25 V; V

CCD

= 0.4 V −400 −−µA

clk

= 2.7 V −−100 µA

clk

=20MHz − 4 − kΩ

clk

=20MHz − 4.5 − pF

clk

= 0.4 V −400 −−µA

clk

= 2.7 V −−100 µA

clk

fi= 4.43 MHz 0.93 1.0 1.07 V

CCO=V23

to V

CCO

to V18= 4.75 to 5.25 V;

= −0.25 to +0.25 V;

CCD

CCA=VCCD=VCCO

= 5 V and

CCD

CCD

V

V

1995 Mar 09 6