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 Y Signal Generated From Three Independent Channels • • • • Clamp Pulse-Select Option White-Clip Function for Y Signal Gain Control for R, G, B, and Y Noise Suppression During Video-Blanking Periods 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. RESET ALCDRV ALC– ALC+ GATE GATEOUT GATEIN GND ALCREF AGCSET AGCDET FR PACKAGE (TOP VIEW) 44 43 42 41 40 39 38 37 36 35 34 NC WB CONTB CONTA VCC BIN GIN RIN CLPLVLB CLPLVLG CLPLVLR 1 33 2 32 3 31 4 30 5 29 6 28 7 27 8 26 9 25 10 24 11 23 AGCOUT REF2V AGCCONT AGCLMT BOUT GOUT ROUT YOUT YALC WCPCONT YCLAMP GND SWR SWG SWB PCL1 PBL PCL2 HL YSW YAGCIN YAGC 12 13 14 15 16 17 18 19 20 21 22 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 high-impedance circuits. During storage or handling, the device leads should be shorted together or the device should be placed in 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 Guidelines for Handling Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies available from Texas Instruments. Copyright 1991, Texas Instruments Incorporated 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 – 41 42 44 Reset GATE 40 GATE IN 38 Gate RESET AGCDET AGCSET CONTA CONTB AGCLMT AGCCONT WB 34 35 4 43 ALC AMP 39 GATEOUT 33 AGCOUT AGC AMP 3 3 30 31 2 Y Clamp WCPCONT WCPCONT 24 21 6 9 7 GIN 10 CLPLVLG RIN CLPLVLR 8 11 16 PBL 17 SWR SWG SWB 4-2 26 YOUT 22 YAGC YAGC 3 Blue Blank Blue Clamp White Level Blue AGC 29 2 28 1 Green AGC Red AGC 27 ROUT 25 YALC 36 ALCREF Green Blank Green Clamp 3 Clamp Buffer BOUT GOUT White Level Red Blank Red Clamp 3 PCL1 HL A/D PCL2 YCLAMP 23 BIN CLPLVLB 19 HLMIX AGC CONT 18 YAGCIN ALCDRV ALC REF Blank Buffer 13 YSW 14 15 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 20 YSW TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 Terminal Functions TERMINAL NAME NO. I/O DESCRIPTION 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 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 No internal connection 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 VCC WB 5 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 Power supply voltage 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 L L 2.4 V – 3 dB BLUE – 4 dB L H 2.7 V – 1 dB –1.5 dB H L 3V 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 YAGCIN 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 (YAGCIN) 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 YAGC 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. YALC 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. 4-4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 analog output channels Terminals 27, 28, and 29 (ROUT, GOUT, and BOUT) are the individual analog output signals used in RGB color applications. Their gain can be affected by the control voltage applied to terminal 31 (AGCCONT). AGC section The AGC amplifier is a high-gain amplifier that requires an appropriate feedback network. AGCLMT input (terminal 30): A dc voltage applied to this terminal limits the amount of gain for R, G, B, and Y. AGCCONT input (terminal 31): A dc voltage applied to this terminal sets the gain (see Figure 3). It is also possible to build a feedback network and obtain AGC action. In this case, the video signal is fed back through AGCCONT. REF2V output (terminal 32): This terminal provides a 2-V reference output. AGCOUT output (terminal 33): This is the output from the AGC block. AGCDET input (terminal 34): Video from terminal 26 (YOUT) can be applied to this node to obtain feedback action. AGCSET input (terminal 35): A dc voltage applied to this terminal sets the gain for AGC action. gate section GATEIN input (terminal 38): If a gating function is desired, video from the YOUT output (terminal 26) can be applied to this terminal. GATEOUT output (terminal 39): Video is passed from GATEIN to GATEOUT if GATE (terminal 40) is low. If GATE is high, GATEOUT is in the high-impedance state. GATE input (terminal 40): A TTL signal can be applied to this input to control the active video (see the description of the GATEOUT terminal above). ALC section An amplifier similar to that in the AGC section is available for use as an integrator. If used, a capacitor should be connected from the ALC -input (terminal 42) to the ALCDRV output (terminal 43). A reset switch is available at the RESET input (terminal 44). The ALC amplifier is a high-gain amplifier requiring an appropriate feedback network. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 4-5 TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 V Input voltage range, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 V Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 25°C to 75°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 125°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltage values are with respect to the GND terminal. recommended operating conditions Supply voltage, VCC MIN NOM MAX 4.8 5 5.2 RIN, GIN, BIN 250 WB Input voltage, VI 0 CLPLVLR, CLPLVLG, CLPLVLB WCPCONT, AGCLMT, AGCCONT 0 CONTA, CONTB, SWR, SWG, SWB, PCL1, Low-level input voltage, VIL PCL2, PBL, RESET Operating free-air temperature, TA 3 V mV 5 2 AGCDET, AGCSET High-level input voltage, VIH 3.05 UNIT 5 V 3 3.5 V – 20 0.4 V 45 °C electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) all sections PARAMETER ICC TEST CONDITIONS Supply current MIN VCC = 5 V TYP‡ MAX 40 50 TYP‡ MAX UNIT mA Y-switch section PARAMETER TEST CONDITIONS White-clip level (see Note 2) MIN UNIT 400% Gate-pulse impedance SWB, SWG, Gate-pulse capacitance SWR 5 kΩ 10 pF clamp section PARAMETER TEST CONDITIONS Clamp-pulse current PCL1 Clamp resistance BIN, GIN, RIN Clamp-pulse input capacitance PCL1 Noise rejection PCL1 to YSW POST OFFICE BOX 655303 TYP‡ – 0.2 PCL1 = 1 µs • DALLAS, TEXAS 75265 MAX UNIT 0.2 mA 30 pF Ω 30 30 ‡ All typical values are at TA = 25° C. NOTE 2: 250 mV = 100%. 4-6 MIN dB TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) (continued) blanking section PARAMETER TEST CONDITIONS Blanking-pulse current PBL Blanking-pulse input capacitance PBL Noise rejection PBL to YSW MIN MAX – 0.2 0.2 30 30 UNIT mA pF dB white-balance section PARAMETER TEST CONDITIONS Input current MIN WB Red channel gain RIN WB to YSW RIN, Blue channel gain –10 10 WB = 3.5 V 2.6 3.5 WB = 3 V 0.5 1.5 –1.7 – 0.6 WB = 2.4 V –3.7 – 2.7 WB = 3.5 V – 4.4 – 3.1 WB = 3 V WB = 2.7 V BIN WB to YSW BIN, MAX –1.9 – 0.8 WB = 2.7 V 1 1.9 WB = 2.4 V 3.5 4.5 MIN TYP† MAX UNIT µA dB dB AGC section PARAMETER TEST CONDITIONS Gain delta between R, G, B channels Gain control RIN,, GIN,, BIN to ROUT,, GOUT, BOUT, YAGC AGC limit 1 AGC limit 2 – 0.5 0 0.5 AGCCONT = 1.5 V –1 0 1 AGCCONT = 4.5 V 11.5 12.5 14.5 AGCLMT = 0 0 AGCLMT = 5 V RIN,, GIN,, BIN to ROUT, GOUT, BOUT RGB bandwidth RIN GIN, GIN BIN to YAGC RIN, Output impedance 12.5 AGCCONT = 2.5 V (AGC on) 2.9 3.6 AGCCONT = 0.5 V (AGC off) 3 5.1 AGCCONT = 2.5 V (AGC on) 3.4 4.2 AGCCONT = 0.5 V (AGC off) 5 6.2 ROUT, GOUT, BOUT UNIT dB dB dB MHz 150 Ω MAX UNIT Y-clamp section PARAMETER TEST CONDITIONS Clamp pulse current PCL2 Clamp pulse capacitance PCL2 MIN TYP† – 0.2 0.2 mA 50 pF white-clip section PARAMETER TEST CONDITIONS White-clip point See Note 3 Knee point 1 Knee point 2 YCL to YOUT Knee point 3 WCPCONT open, See Note 3 WCPCONT = 3 V, See Note 3 WCPCONT = 2 V, See Note 3 Knee compression ratio Output impedance † All typical values are at TA = 25° C. NOTE 3: 340 mV = 100%. MIN MAX UNIT 118% 176% 13.5 YOUT POST OFFICE BOX 655303 TYP† 400% • DALLAS, TEXAS 75265 236% 35% 59% 15.5 17.5 dB 100 Ω 4-7 TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) (continued) ALC-clip section PARAMETER ALCREF VO TEST CONDITIONS MIN TYP† MAX VCC = 4.8 V to 5.2 V 2.6 2.8 3 Output voltage YALC 340 Clip level YALC 800 Output impedance ALCREF, YALC UNIT V mV mV 100 Ω MAX UNIT AGCDET section (see Note 4) PARAMETER Gain TEST CONDITIONS MIN AGCDET, AGCOUT 60 AGC setpoint 1 AGCDET, AGCSET, AGCOUT AGC setpoint 2 TYP† AGC setpoint 3 AGCSET = 3.5 V 41% AGCSET = 1.5 V 12% AGCSET open 24% dB ALC-amplifier section PARAMETER TEST CONDITIONS Maximum output voltage ALCDRV Minimum output voltage ALCDRV VIO IIB Input offset voltage ALC+, ALC – Input bias current ALC+, ALC – II Input current RESET MIN TYP† MAX 3.5 V 0.5 –8 0 – 0.5 Gain ALC+, ALC –, ALCDRV † All typical values are at TA = 25° C. NOTE 4: The YAGC output is 100% when the YAGCIN input = 250 mV. UNIT 8 V mV 200 nA 0.5 mA 60 dB operating characteristics over recommended operating temperature range (unless otherwise noted) Y-switch section PARAMETER TEST CONDITIONS Switching frequency, RIN, GIN, BIN to YSW tpd WB = 0 V to VCC MIN TYP 8 10 MAX UNIT MHz RIN or BIN to YSW 20 30 GIN to YSW 10 20 ns 20 ns SWR, SWG, or SWB to YSW 5 SWR, SWG, SWB acquisition time YSW output settling time 30 ns clamp section PARAMETER tpd TEST CONDITIONS MIN PCL1 to YSW MAX UNIT 100 ns MAX UNIT 150 ns blanking section PARAMETER tpd 4-8 TEST CONDITIONS PBL to YSW POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MIN TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 operating characteristics over recommended operating temperature range (unless otherwise noted) (continued) Y-clamp section PARAMETER tpd TEST CONDITIONS MIN PCL2 to YOUT MAX UNIT 500 ns white-clip section PARAMETER TEST CONDITIONS Switching frequency, YCL to YOUT WCPCONT open MIN TYP 6 8 MAX UNIT MHz ALC-clip section PARAMETER TEST CONDITIONS Switching frequency, YCL to YALC MIN 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MAX UNIT MHz 4-9 TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 TYPICAL CHARACTERISTICS 4 BLUE-CHANNEL GAIN CHANGE vs WHITE-BALANCE CONTROL VOLTAGE Blue-Channel Gain Change – dB Red-Channel Gain Change – dB RED-CHANNEL GAIN CHANGE vs WHITE-BALANCE CONTROL VOLTAGE 2 0 –2 –4 0 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 4 2 0 –2 –4 0 5 2.5 White-Balance Control Voltage – V 2.6 2.7 2.8 2.9 3 3.1 3.2 Figure 1 Figure 2 AGC GAIN CHANGE vs AGC CONTROL VOLTAGE Y-SIGNAL OUTPUT VOLTAGE vs WHITE-CLIP CONTROL INPUT VOLTAGE 18 14 YOUT Voltage – V AGC Gain Change – dB 16 12 10 8 6 4 2 Knee Voltage 0 0 1 2 3 4 5 WCPCONT Voltage – V AGC Control Voltage – V Figure 3 4-10 5 White-Balance Control Voltage – V Figure 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 APPLICATION INFORMATION 5V C10 0.1 µF 5V 5V 5V 10 11 AGCSET AGCDET GND GATEIN GATE GATEOUT ALC– ALCREF ROUT RIN YOUT CLPLVLB YALC CLPLVLG WCPCONT CLPLVLR YCLAMP GND C7 0.1 µF 32 31 R8 100 Ω R4 10 kΩ R5 10 kΩ R12 1 kΩ 29 28 5V 27 26 C12 0.1 µF 25 24 23 GT2 From Timing Generator (see Note A) Q3 2N390 4 ROUT R13 1 kΩ 5V C8 0.1 µF GT1 GOUT 30 12 13 14 15 16 17 18 19 20 21 22 R3 10 kΩ Q2 2N3904 33 R9 100 Ω YAGC 9 GIN GOUT YAGCIN 8 TL1051 Video Preprocessor BIN YSW 0.1 µF BOUT HL C6 VCC PCL2 0.1 µF 7 AGCLMT CONTA PBL C5 6 AGCCONT CONTB PCL1 0.1 µF REF2V SWB 5 C11 0.1 µF AGCOUT WB SWG C4 4 ALC+ RESET 3 NC SWR 2 ALCDRV 44 43 42 41 40 39 38 37 36 35 34 1 C3 0.1 µF R11 1 kΩ 5V R2 33 kΩ 5V BOUT R6 10 kΩ R1 22 kΩ C2 0.1 µF R7 100 Ω C9 0.1 µF C1 0.1 µF 5V Q1 2N3904 C13 0.1 µF GT3 BCP1 CP2 BCP2 R10 100 Ω Q4 2N3904 YOUT R14 1 kΩ NOTE A: This application circuit shows TTL signals originating from the TI SN28835 1/2-Inch NTSC Timer. However, the TL1051 video preprocessor interfaces equally well with a TI TMS3471C 2/3-Inch NTSC timer, a TI SN28837 1/2-Inch PAL timer, or a user-defined timing generator. Figure 5. Typical Application Circuit POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 4-11 TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 MECHANICAL DATA FR/S-PDFP-G44 PLASTIC QUAD FLATPACK 33 23 22 34 0,80 TYP 0,40 0,20 12 44 1 0,20 0,10 11 8,00 TYP 10,20 SQ 9,80 12,80 SQ 12,00 0,10 MIN Seating Plane 0°– 10° 0,80 0,30 2,25 MAX 0,10 4040159/A–10/93 NOTES: A. All linear dimensions are in millimeters. B. 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