TEXAS INSTRUMENTS TL1051 Technical data

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TL1051

VIDEO PREPROCESSOR CIRCUIT

SOCS032B – NOVEMBER 1991

• Solid-State Reliability

• Supports Both Color and Monochrome

Applications

• Three Independent Channels Available for

Use With RGB Monitors

• Clamp Pulse-Select Option

• White-Clip Function for Y Signal

• Gain Control for R, G, B, and Y

• Noise Suppression During Video-Blanking

Periods

• Y Signal Generated From Three

Independent Channels

description

The TL1051 is a bipolar monolithic integrated circuit designed for use in preprocessing three channels of TI CCD image sensors. It receives video inputs from the TI TL1593 three-channel sample-and-hold circuit and outputs three processed channel signals and a single multiplexed Y (luminance) signal. Processing functions of the TL1051 include gain, automatic gain control, clamp, white balance, and white clip.

The TL1051 is supplied in a 44-pin surface-mount plastic package and is characterized for operation from –20°C to 45°C.

FR PACKAGE

(TOP VIEW)

GND

ALCREF

AGCSET

RESET

ALCDRV

ALC–

ALC+

GATE

GATEOUT

GATEIN

AGCDET

43 42 41 40 3944 38

CONTB

CONTA

CLPLVLB CLPLVLG CLPLVLR

NC – No internal connection

This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according to MIL-STD-883C, Method 3015; however, precautions should be taken to avoid application of any voltage higher than maximum-rated voltages to these

conductive foam. In a circuit, unused inputs should always be connected to an appropriate logic voltage level, preferably either VCC or ground. Specific guidelines for handling devices of this type are contained in the publication

(ESDS) Devices and Assemblies

high-impedance circuits. During storage or handling, the device leads should be shorted together or the device should be placed in

available from Texas Instruments.

BIN GIN RIN

3 4 5 6 7 8 9 10 11

12 13

GND

14 15 16 17

SWB

SWR

SWG

PBL

PCL1

36 35 3437

18 19 20 21 22

YSW

PCL2

Y AGCIN

Guidelines for Handling Electrostatic-Discharge-Sensitive

33 32 31 30 29 28 27 26 25 24 23

Y AGC

AGCOUT REF2V AGCCONT AGCLMT BOUT GOUT ROUT YOUT Y ALC WCPCONT YCLAMP

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

4-1

TL1051 VIDEO PREPROCESSOR CIRCUIT

SOCS032B – NOVEMBER 1991

functional block diagram

ALC

ALC –

ALC AMP

ALCDRV

RESET

GATE

GATE IN

AGCDET

AGCSET

CONTA CONTB

AGCLMT

AGCCONT

PCL2

YCLAMP

WCPCONT

YAGCIN

BIN

CLPLVLB

GIN

CLPLVLG

RIN

CLPLVLR

PCL1

PBL

44 40

38 34

35 4

3 30 31

2 18

21 6

7 10

8 11

Reset

Gate

AGC AMP

A/D

Blue

Clamp

Green

Clamp

Red

Clamp

Blue

Blank

Green

Blank

Red

Blank

3 3

Clamp Buffer

Blank

Buffer

White

Level

White Level

AGC

CONT

YAGC

Blue AGC

Green

AGC

Red

AGC

GATEOUT

AGCOUT

HLMIX

Clamp

WCP-

CONT

ALC REF

27 25 36

YOUT

YAGC

BOUT

GOUT

ROUT YALC

ALCREF

4-2

SWR SWG SWB

13 14 15

YSW

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

YSW

VIDEO PREPROCESSOR CIRCUIT

I/O

DESCRIPTION

Terminal Functions

TERMINAL

NAME NO.

AGCCONT 31 I AGC control AGCDET 34 I AGC detect AGCLMT 30 I AGC limit AGCOUT 33 O AGC out AGCSET 35 I AGC set ALCDRV 43 O ALC drive ALCREF 36 O ALC reference ALC+ 41 I ALC noninverting input ALC– 42 I ALC inverting input BIN 6 I Blue channel in BOUT 29 O Blue channel out CLPLVLB 9 I DC clamp level – blue CLPLVLG 10 I DC clamp level – green CLPLVLR 11 I DC clamp level – red CONTA 4 I White balance digital control – A CONTB 3 I White balance digital control – B GATE 40 I Video gate control switch GATEIN 38 I Video gate in GATEOUT 39 O Video gate out GIN 7 I Green channel in GND 12, 37 Ground GOUT 28 O Green channel out HL 19 O Highlight suppression (not used) NC 1 No internal connection PBL 17 I Process blanking PCL1 16 I Clamp signal 1 PCL2 18 I Clamp signal 2 REF2V 32 O 2-V reference RESET 44 I Reset RIN 8 I Red channel in ROUT 27 O Red channel out SWB 15 I Multiplex switch – blue SWG 14 I Multiplex switch – green SWR 13 I Multiplex switch – red V

WB 2 I White balance analog control WCPCONT 24 I White clip control YAGC 22 O YAGC out YAGCIN 21 I Y AGC in YALC 25 O Y automatic level control YCLAMP 23 I Y clamp YOUT 26 O Y signal out YSW 20 O Multiplexed Y out

5 Power supply voltage

TL1051

SOCS032B – NOVEMBER 1991

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

4-3

TL1051 VIDEO PREPROCESSOR CIRCUIT

SOCS032B – NOVEMBER 1991

detailed description

white-balance control

White balance in the monochrome mode can be adjusted with either terminal 2 (white-balance analog control) or with terminals 3 and 4 (white-balance digital controls B and A, respectively). If analog control is selected, terminals 3 and 4 should be left open and terminal 2 adjusted appropriately (see Figure 1 and Figure 2 for control characteristics). The white balance is controlled per the following table:

CONTB CONTA VOLTAGE LEVEL ON WB RED BLUE

L L 2.4 V –3 dB –4 dB

L H 2.7 V –1 dB –1.5 dB H L 3 V 1 dB 1.5 dB H H 3.5 V 3 dB 4 dB

analog inputs RIN, GIN, BIN

The TI TL1593 sample-and-hold circuit is normally the source for these inputs. The source signals should be ac coupled into the TL1051. Gain control should be used on at least two of the three channels in order to obtain an optimum balance.

clamp level

Input terminals 9, 10, and 11 (CLPLVLB, CLPLVLG, and CLPLVLR, respectively) should initially be set at approximately 2 V dc. The levels should then be balanced so that clock feedthrough on terminal 20 (YSW) is minimized under dark conditions.

multiplexed switching

Input terminals 13, 14, and 15 (SWR, SWG, and SWB, respectively) are the TTL-level signals used to multiplex the three channels.

clamping and process blanking

Input terminals 16, 17, and 18 (PCL1, PBL, and PCL2) are used for TTL clamp and blank signals. The dark references are clamped by the PCL1 signal. Unwanted noise in the video signal is eliminated by the PBL signal. The Y signal can then be reclamped with the PCL2 signal.

Depending on the application, gain and automatic gain control (AGC) may or may not be selected. The following descriptions cover both selections.

YSW

YSW output (terminal 20): Fast sampling of the video input signals with the TTL multiplex signals generates this high-bandwidth output without adjustable gain or AGC.

gain and AGC selected

Y AGCIN input (terminal 21): If gain or AGC operation is selected, the YSW output (terminal 20) should be directly connected to YAGCIN.

YAGC output (terminal 22): The multiplexed signal with controllable gain (controlled by the AGCCONT input) is available at this terminal if terminals 20 (YSW) and 21 (Y AGCIN) are connected. If further signal processing is desired, this terminal should be ac coupled to terminal 23 (YCLAMP).

YCLAMP input (terminal 23): The Y signal from Y AGC can be reclamped at this point by applying a wider clamp pulse to terminal 18 (PCL2).

WCPCONT input (terminal 24): A dc voltage applied to this white clip control input causes the white clip function to be performed on the Y signal. See Figure 4 for the clip control characteristics.

Y ALC output (terminal 25): If either AGC or automatic level control (ALC) is selected, the Y signal at this point should be fed back to either the ALC or AGC block.

YOUT output (terminal 26): The white-clipped Y signal is available at this output.

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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