FAIRCHILD RC6704

Electronics
Semiconductor Division
RC6704
Triple Fixed Gain Video Amplifier
with Separate Enable Inputs
Features
Description
• 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 = 150Ω)
• 0.06° differential phase (AV = 2, RL = 150Ω)
• High CMRR (75 dB), High PSRR (70 dB)
• Dual ±5V power supply
• Low offset 2.0 mV
• 16-pin narrow SOIC package
• 300 V/µs slew rate
• Fast settling time: 0.1% in 35 ns
• Voltage gain accuracy better than 0.5%
• TTL or CMOS compatible enable inputs
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
IN1–
IN1+
R
R
VCCO
R/2
OUT1
EN1
VCC
IN2–
IN2+
R
R
OUT2
R/2
EN2
VEE
OUT3
R
R
EN3
IN3–
R/2
IN3+
VEEO
R = 500Ω
65-7450
Rev. 1.0.1
RC6704
PRODUCT SPECIFICATION
Pin Assignments
Pin Definitions
IN1–
1
16
VCCO
Pin
Name
IN1+
2
15
OUT1
EN1
14
Enables amplifier 1 when low
VCC
3
14
EN1
EN2
12
Enables amplifier 2 when low
IN2–
4
13
OUT2
EN3
10
Enables amplifier 3 when low
IN2+
5
12
EN2
IN1–
1
Amplifier 1 inverting input
2
Amplifier 1 non-inverting input
6
11
OUT3
IN1+
VEE
IN2–
4
Amplifier 2 inverting input
IN3–
7
10
EN3
IN2+
5
Amplifier 2 non-inverting input
IN3+
8
9
IN3–
7
Amplifier 3 inverting input
IN3+
8
Amplifier 3 non-inverting input
VEEO
65-3399-03
Pin
Number
Pin Function Description
OUT1
15
Amplifier 1 output
OUT2
13
Amplifier 2 output
OUT3
11
Amplifier 3 output
VCC
3
Analog positive supply
VCCO
16
Positive supply for output
stages
VEE
6
Analog negative supply
VEEO
9
Negative supply for output
stages
Absolute Maximum Ratings
(beyond which the device may be damaged)1
Parameter
Max.
Units
Positive power supply, VCC
7
V
Negative power supply, VEE
-7
V
VCC – 2.0
V
0
+70
°C
-40
+125
°C
Junction Temperature
150
°C
Lead Soldering Temperature (10 seconds)
300
°C
+70
°C
Differential input voltage
Operating Temperature
Storage Temperature
Operating Temperature
Min.
VEE + 2.0
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.
Operating Conditions
Parameter
2
Min.
Typ.
Max.
Units
VCC
Power Supply Voltage
4.75
5.0
5.25
V
VEE
Negative Supply Voltage
-4.75
-5.0
-5.25
V
θJA
SO16 thermal resistance
105
°C/W
PRODUCT SPECIFICATION
RC6704
DC Characteristics
VCC = 5V, VEE = -5V, AV = 2, RLOAD = 150Ω, TA = 0°C to 70°C, unless otherwise specified.
Parameter
VOS
Conditions
Input Offset Voltage
Min.
No Load
∆VOS/∆T Offset Voltage Drift
1
Typ.
Max.
Units
±2
±5
mV
± 12
± 50
µV/°C
IB
Input Bias Current
±2
± 10
µA
∆IB/∆T
Input Bias Current Drift1
± 10
± 50
nA/°C
Rin
Input Resistance1
MΩ
1
1
Cin
Input Capacitance
CMIR
Common Mode Input Range
CMRR
Common Mode Rejection Ratio No Load
60
75
dB
PSRR
Power Supply Rejection Ratio
No Load
60
70
dB
Is
Quiescent Supply Current
No Load, Whole IC
Isd
Supply Current Disabled
ROUT
0.5
1
Output Impedance
COUT
Output Capacitance
IOUT
Output Current
VOUT
Output Voltage Swing
AV
± 2.5
Enabled, at DC
1
2
V
25
35
mA
3
4
mA
Ω
0.2
Disabled
pF
0.5
pF
35
mA
No Load
± 2.5
± 3.0
V
RL = 150Ω
± 2.5
± 3.0
V
1.99
2.0
Closed-loop Gain
2.01
dB
∆AV/∆T
Closed-loop Gain Drift
25
ppm/°C
Venh
Enable High Voltage
2.4
V
Venl
Enable Low Voltage
Ien
Enable Input Current
toff
ton
1
Disable Time
1
Enable Time
1
3
Settling to 1%
0.8
V
10
µA
1.0
ns
200
ns
Note:
1. Guaranteed by design.
3
RC6704
PRODUCT SPECIFICATION
AC Characteristics
VCC = 5V, VEE = -5V, AV = 2, TA = 0 to 70°C, RLOAD = 150Ω, CL = 10 pF unless otherwise specified.
Parameter
Conditions
Min.
Typ.
Max.
Units
Frequency Response
BW
-3 dB Bandwidth (AV = 2)1
Flat
±0.1 dB Bandwidth1
Peak
Maximum Small Signal AC
Peaking1
ISO
Off Isolation1
VOUT = 0.4 Vpp
60
VOUT = 0.8 Vpp
XTALK
15
MHz
55
MHz
20
MHz
0.4
0.7
dB
@ 5 MHz
90
dB
@ 5 MHz, RIN = 50Ω
70
dB
2V Output Step
7
Settling time to 0.1 %
2V Output Step
35
ns
1
6
%
Crosstalk
Isolation1
Time Domain Response
tr1, tf1
ts
Rise and Fall Time 10% to 90%1
1
OS
Overshoot
2V Output Step
US
Undershoot1
2V Output Step
SR
Slew Rate1
VOUT = ±2.0V
200
10
ns
1.5
%
300
V/µs
Distortion
HD2
2nd Harmonic Distortion1
VOUT = 0.8 Vpp, @ FO = 20
MHz
-50
dB
HD3
3nd Harmonic Distortion1
VOUT = 0.8 Vpp, @ FO = 20
MHz
-50
dB
-140
dBm
10
nV/√Hz
Equivalent Input Noise
NF
SND
Noise Floor > 100 KHz1
Spectral Noise
Density1
100 kHz to 200 MHz
Video Performance
DG
Diff. Gain (p-p), NTSC & PAL1
RL = 150Ω, VOUT = ±1.5V
0.06
%
DP
Diff. Phase (p-p), NTSC & PAL1
RL = 150Ω, VOUT = ±1.5V
0.06
Deg.
Note:
1. Guaranteed by design.
Test Circuits
AV = +2
Video
Input
1/3
RC6704
AV = +1
RS
75Ω
RL
75Ω
RLOAD = RL + RS
Video
Output
10 pF
CL
Video
Input
1/3
RC6704
AV = -1
RS
75Ω
RL
75Ω
RLOAD = RL + RS
Video
Output
10 pF
CL
Video
Input
1/3
RC6704
RS
75Ω
RL
75Ω
Video
Output
10 pF
CL
RLOAD = RL + RS
65-7479
Note:
1. When driving a 75Ω cable, the source terminator resistor must be placed as close as possible to the output of the device.
4
PRODUCT SPECIFICATION
RC6704
Applications Discussion
Circuit Board
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.
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.
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.
+
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.
R
G
Output
–
Channel 3
Input
+
B
Decoder
65-7460
Figure 1.
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.
+
–
Channel 2
Input
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 75Ω cable, place the 75Ω source
termination resistor as close to the amplifier output as possible.
–
Channel 1
Input
Video Busses
R G B
Channel a
Red Input
Channel
Select
–
R
+
–
G
+
Channel a
Green Input
Channel a
Blue Input
–
R
+
Channel b
Red Input
–
G
+
–
B
+
Channel b
Green Input
–
B
+
74LS04
Channel b
Blue Input
65-7461
Figure 2.
5
RC6704
Notes
6
PRODUCT SPECIFICATION
RC6704
PRODUCT SPECIFICATION
Mechanical DImensions – 16-Lead SOIC Package
Inches
Symbol
Min.
A
A1
B
C
D
E
e
H
h
L
N
α
ccc
Millimeters
Max.
Min.
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
.228
.010
.016
5.80
0.25
0.40
16
6.20
0.50
1.27
16
0°
8°
0°
8°
—
.004
—
0.10
16
1. Dimensioning and tolerancing per ANSI Y14.5M-1982.
Max.
.053
.069
.004
.010
.013
.020
.008
.010
.386
.394
.150
.158
.050 BSC
.244
.020
.050
Notes:
Notes
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.
3
6
9
E
1
H
8
h x 45°
D
C
A1
A
α
e
B
SEATING
PLANE
–C–
LEAD COPLANARITY
ccc C
7
L
RC6704
PRODUCT SPECIFICATION
Ordering Information
Product Number
Temperature Range
Screening
Package
Package Marking
0° to 70°C
Commercial
16 Pin Narrow SOIC
RC6704M
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
© 1997 Raytheon Company