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Electronics
Semiconductor Division
RC6704
Triple Fixed Gain Video Amplifier
with Separate Enable Inputs Features
* Triple video amplifier with internal resistors to set gains to +2, +1, and -1 * Independently enabled amplifiers * 60 MHz -3 dB Bandwidth (AV = 2) * 20 MHz 0.1 dB gain flatness * 0.06% differential gain (AV = 2, RL = 150) * 0.06 differential phase (AV = 2, RL = 150) * High CMRR (75 dB), High PSRR (70 dB) * Dual 5V power supply * Low offset 2.0 mV * 16-pin narrow SOIC package * 300 V/s slew rate * Fast settling time: 0.1% in 35 ns * Voltage gain accuracy better than 0.5% * TTL or CMOS compatible enable inputs
Description
The RC6704 consists of three low power, wide band voltage feedback operational amplifiers. Internal thin-film gain setting resistors provide gains of +2, +1 and -1. Each channel is capable of delivering a load current of at least 35mA. Each amplifier can be independently enabled or disabled with a TTL or CMOS signal. When disabled, the amplifier is in a high impedance output state, presenting a very high input to output isolation. The layout is optimized for low channel to channel crosstalk. The amplifiers are optimized for video applications where low differential gain and low phase distortion are significant requirements.
Applications
* * * * * * * RGB amplifier 3:1 crosspoint switch RGB switch Video instrumentation amplifier Selectable gain amplifier Programmable filter Active filter
Block Diagram
R R/2 OUT1 EN1 R R/2 R OUT2 EN2 OUT3 R IN3- R/2 IN3+ VEEO R EN3 R VCCO
IN1- IN1+ VCC IN2- IN2+ VEE
R = 500
65-7450
Rev. 1.0.1
RC6704
PRODUCT SPECIFICATION
Pin Assignments
IN1- IN1+ VCC IN2- IN2+ VEE IN3- IN3+
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
65-3399-03
Pin Definitions
VCCO OUT1 EN1 OUT2 EN2 OUT3 EN3 VEEO
Pin Name EN1 EN2 EN3 IN1- IN1+ IN2- IN2+ IN3- IN3+ OUT1 OUT2 OUT3 VCC VCCO VEE VEEO
Pin Number 14 12 10 1 2 4 5 7 8 15 13 11 3 16 6 9
Pin Function Description Enables amplifier 1 when low Enables amplifier 2 when low Enables amplifier 3 when low Amplifier 1 inverting input Amplifier 1 non-inverting input Amplifier 2 inverting input Amplifier 2 non-inverting input Amplifier 3 inverting input Amplifier 3 non-inverting input Amplifier 1 output Amplifier 2 output Amplifier 3 output Analog positive supply Positive supply for output stages Analog negative supply Negative supply for output stages
Absolute Maximum Ratings
(beyond which the device may be damaged)1 Parameter Positive power supply, VCC Negative power supply, VEE Differential input voltage Operating Temperature Storage Temperature Junction Temperature Lead Soldering Temperature (10 seconds) Operating Temperature 0 Short circuit tolerance: No more than one output can be shorted to ground.
Note: 1. Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if Operating Conditions are not exceeded.
Min.
Max. 7 -7
Units V V V C C C C C
VEE + 2.0 0 -40
VCC - 2.0 +70 +125 150 300 +70
Operating Conditions
Parameter VCC VEE JA Power Supply Voltage Negative Supply Voltage SO16 thermal resistance Min. 4.75 -4.75 Typ. 5.0 -5.0 105 Max. 5.25 -5.25 Units V V C/W
2
PRODUCT SPECIFICATION
RC6704
DC Characteristics
VCC = 5V, VEE = -5V, AV = 2, RLOAD = 150, TA = 0C to 70C, unless otherwise specified. Parameter VOS IB IB/T Rin Cin CMIR CMRR PSRR Is Isd ROUT COUT IOUT VOUT AV AV/T Venh Venl Ien toff ton Input Offset Voltage
1
Conditions No Load
Min.
Typ. 2 12 2 10
Max. 5 50 10 50 2
Units mV V/C A nA/C M pF V dB dB
VOS/T Offset Voltage Drift Input Bias Current
Input Bias Current Drift1 Input Resistance1 Input Capacitance
1
1 0.5 2.5 60 60 75 70 25 3 Enabled, at DC
1
Common Mode Input Range Common Mode Rejection Ratio No Load Power Supply Rejection Ratio Quiescent Supply Current Supply Current Disabled Output Impedance Output Current Output Voltage Swing Closed-loop Gain Closed-loop Gain Drift Enable High Voltage Enable Low Voltage Enable Input Current Disable Time Enable Time
1 1 1 1
No Load No Load, Whole IC
35 4
mA mA pF mA V V
0.2 0.5 35 2.5 2.5 1.99 25 2.4 0.8 3 1.0 10 3.0 3.0 2.0 2.01
Output Capacitance
Disabled No Load RL = 150
dB ppm/C V V A ns ns
Settling to 1%
200
Note: 1. Guaranteed by design.
3
RC6704
PRODUCT SPECIFICATION
AC Characteristics
VCC = 5V, VEE = -5V, AV = 2, TA = 0 to 70C, RLOAD = 150, CL = 10 pF unless otherwise specified. Parameter Frequency Response BW Flat Peak ISO XTALK tr1, tf1 ts OS US SR HD2 HD3 -3 dB Bandwidth (AV = 2)1 0.1 dB Bandwidth1 Maximum Small Signal AC Peaking1 Off Isolation1 Crosstalk Isolation1 @ 5 MHz @ 5 MHz, RIN = 50 2V Output Step 2V Output Step 2V Output Step 2V Output Step VOUT = 2.0V VOUT = 0.8 Vpp, @ FO = 20 MHz VOUT = 0.8 Vpp, @ FO = 20 MHz 200 VOUT = 0.4 Vpp VOUT = 0.8 Vpp 15 60 55 20 0.4 90 70 7 35 6 1.5 300 -50 -50 10 0.7 MHz MHz MHz dB dB dB ns ns % % V/s dB dB Conditions Min. Typ. Max. Units
Time Domain Response Rise and Fall Time 10% to 90%1 Settling time to 0.1 % Overshoot
1 1
Undershoot1 Slew Rate1 2nd Harmonic Distortion1 3nd Harmonic Distortion1
Distortion
Equivalent Input Noise NF SND DG DP Noise Floor > 100 KHz1 Spectral Noise Density1 100 kHz to 200 MHz RL = 150, VOUT = 1.5V RL = 150, VOUT = 1.5V -140 10 0.06 0.06 dBm nV/Hz % Deg.
Video Performance Diff. Gain (p-p), NTSC & PAL1 Diff. Phase (p-p), NTSC & PAL1
Note: 1. Guaranteed by design.
Test Circuits
AV = +2 Video Input RS 75 Video Input AV = +1 RS 75 Video Input AV = -1 RS 75
1/3 RC6704
Video Output 10 pF CL
1/3 RC6704
Video Output 10 pF CL
1/3 RC6704
Video Output 10 pF CL
65-7479
RL 75 RLOAD = RL + RS
RL 75 RLOAD = RL + RS
RL 75 RLOAD = RL + RS
Note: 1. When driving a 75 cable, the source terminator resistor must be placed as close as possible to the output of the device.
4
PRODUCT SPECIFICATION
RC6704
Applications Discussion
Each of the three sections of the RC6704 is provided with an Enable input, thus the part is useful for selecting and multiplexing. It is suitable for selectable gain and programmable filter applications. A three-channel video multiplexer can be built with just one RC6704 and a decoder, as shown in Figure 1. Note that RC6704 enable time is shorter than its disable time, hence a make-before-break action is provided, minimizing switching transients on the signal output. An RGB switch is shown in Figure 2.
Circuit Board
High-frequency applications require good grounding, power supply decoupling, low parasitic capacitance and inductance, and good isolation between the inputs to minimize crosstalk. Avoid coupling from output to input to prevent positive feedback.
Channel 1 Input
- + R
Channel 2 Input
- + G Output
Capacitive Load
The RC6704 can drive a capacitive load from 10 to over 100 pF. In back terminated video applications, bandwidth will only be limited by the RC time constants of the external output components. A minimum 10 pF capacitive load is required. When driving a 75 cable, place the 75 source termination resistor as close to the amplifier output as possible.
Channel 3 Input - + B
Decoder
65-7460
Enable/Disable
The enable pins (10, 12, 14), when pulled to a TTL or CMOS logic low or when tied to ground, activate each amplifier individually. When pulled to a TTL or CMOS logic high, the amplifier is tri-stated and presents a high impedance at its output. When disabled the amplifier's power consumption drops, and the non-inverting input signal is isolated from its respective output.
Figure 1.
Video Busses RGB Channel a Red Input - R + - G + - B + - R + Channel b Red Input
DC Accuracy
The RC6704 is a voltage-feedback amplifier; the inverting and non-inverting inputs have similar impedances and bias currents. To minimize offset voltage, the resistances seen by inverting and non-inverting inputs must be equal.
Channel a Green Input
- G +
Channel b Green Input
Channel a Blue Input Channel Select
- B +
Channel b Blue Input
74LS04
65-7461
Figure 2.
5
RC6704
PRODUCT SPECIFICATION
Notes
6
RC6704
PRODUCT SPECIFICATION
Mechanical DImensions - 16-Lead SOIC Package
Symbol A A1 B C D E e H h L N ccc Inches Min. Max. Millimeters Min. Max. Notes: Notes 1. Dimensioning and tolerancing per ANSI Y14.5M-1982. 2. "D" and "E" do not include mold flash. Mold flash or protrusions shall not exceed .010 inch (0.25mm). 3. "L" is the length of terminal for soldering to a substrate. 4. Terminal numbers are shown for reference only. 5 2 2 5. "C" dimension does not include solder finish thickness. 6. Symbol "N" is the maximum number of terminals.
.053 .069 .004 .010 .013 .020 .008 .010 .386 .394 .150 .158 .050 BSC .228 .010 .016 16 0 -- 8 .004 .244 .020 .050
1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 9.80 10.00 3.81 4.00 1.27 BSC 5.80 0.25 0.40 16 0 -- 8 0.10 6.20 0.50 1.27
3 6
16
9
E
H
1
8
D A1 A SEATING PLANE -C- LEAD COPLANARITY ccc C e B
h x 45 C
L
7
RC6704
PRODUCT SPECIFICATION
Ordering Information
Product Number RC6704M Temperature Range 0 to 70C Screening Commercial Package 16 Pin Narrow SOIC Package Marking RC6704M
The information contained in this data sheet has been carefully compiled; however, it shall not by implication or otherwise become part of the terms and conditions of any subsequent sale. Raytheon's liability shall be determined solely by its standard terms and conditions of sale. No representation as to application or use or that the circuits are either licensed or free from patent infringement is intended or implied. Raytheon reserves the right to change the circuitry and any other data at any time without notice and assumes no liability for errors.
LIFE SUPPORT POLICY:
Raytheon's products are not designed for use in life support applications, wherein a failure or malfunction of the component can reasonably be expected to result in personal injury. The user of Raytheon components in life support applications assumes all risk of such use and indemnifies Raytheon Company against all damages. Raytheon Electronics Semiconductor Division 350 Ellis Street Mountain View CA 94043 415 968 9211 FAX 415 966 7742
5/97 0.0m Stock#DS20006704 (c) 1997 Raytheon Company

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