ELANTEC EL4089CS

EL4089C
EL4089C
DC Restored Video Amplifier
Features
General Description
# Complete video level restoration
system
# 0.02% differential gain and 0.05§
differential phase accuracy at
NTSC
# 60 MHz bandwidth
# 0.1 dB flatness to 10 MHz
# VS e g 5V to g 15V
# TTL/CMOS hold signal
The EL4089C is an 8-pin complete DC-restored monolithic video amplifier sub-system. It contains a high quality video amplifier and a nulling, sample-and-hold amplifier specifically designed to stabilize video performance.
Applications
# Input amplifier in video
equipment
# Restoration amplifier in video
mixers
Ordering Information
Part No.
Temp. Range
EL4089CN 0§ C to a 75§ C
EL4089CS
0§ C to a 75§ C
Package
OutlineÝ
8-Pin P-DIP MDP0031
8-Lead SO
MDP0027
When the HOLD logic input is set to a TTL/CMOS logic 0, the
sample- and-hold amplifier can be used to null the DC offset of
the video amplifer.
When the HOLD input goes to a TTL/CMOS logic l, the correcting voltage is stored on the video amplifier’s input coupling
capacitor. The correction voltage can be further corrected as
need be, on each video line.
The video amplifier is optimized for video performance and low
power. Its current feedback design allows the user to maintain
essentially the same bandwidth over a gain range of nearly 10:1.
The amplifier drives back-terminated 75X lines.
The EL4089C is fabricated in Elantec’s proprietary Complementary Bipolar process which produces NPN and PNP transistors with equivalent AC and DC performance. The EL4089C
is specified for operation over 0§ C to a 75§ C temperature range.
Connection Diagram
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a ‘‘controlled document’’. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 1993 Elantec, Inc.
January 1996 Rev B
4089 – 1
DC restoring amplifier with a gain of 2, restoring to ground.
EL4089C
DC Restored Video Amplifier
Absolute Maximum Ratings (TA e 25§ C)
Voltage between V a and Vb
Voltage between VIN a , S/HIN a ,
and GND pins
VOUT Current
Current into VINb and HOLD Pins
Internal Power Dissipation
33V
(V a ) a 0.5V
to (Vb) b0.5V
60 mA
5 mA
See Curves
Operating Ambient
Temperature Range
Operating Junction Temperature
Plastic DIP or SOL
Storage Temperature Range
0§ C to a 75§ C
150§ C
b 65§ C to a 150§ C
Important Note:
All parameters having Min/Max specifications are guaranteed. The Test Level column indicates the specific device testing actually
performed during production and Quality inspection. Elantec performs most electrical tests using modern high-speed automatic test
equipment, specifically the LTX77 Series system. Unless otherwise noted, all tests are pulsed tests, therefore TJ e TC e TA.
Test Level
I
II
III
IV
V
Test Procedure
100% production tested and QA sample tested per QA test plan QCX0002.
100% production tested at TA e 25§ C and QA sample tested at TA e 25§ C ,
TMAX and TMIN per QA test plan QCX0002.
QA sample tested per QA test plan QCX0002.
Parameter is guaranteed (but not tested) by Design and Characterization Data.
Parameter is typical value at TA e 25§ C for information purposes only.
Open Loop DC Electrical Characteristics
Provisional Supplies at g 15V, Load e 1 kX; TA e a 25§ C
Parameter
Description
Temp
Min
Typ
Max
Test
Level
Units
12
25
II
mV
Amplifier Section (HOLD e 5V)
VOS
Input Offset Voltage
a 25§ C
Ib a
IN a Input Bias Current
a 25§ C
1
5
II
mA
Ibb
INb Input Bias Current
a 25§ C
18
150
II
mA
ROL
Transimpedance (Note 1)
a 25§ C
800
II
kX
RINb
INb Resistance
a 25§ C
20
V
X
CMRR
Common Mode Rejection Ratio
(Note 2)
a 25§ C
44
60
II
dB
VO
Output Voltage Swing
a 25§ C
g 12
g 13
II
V
ISC
Short Circuit Current
(IN a Only Driven to 0.5V)
a 25§ C
45
100
II
mA
Composite Input Offset Voltage
(Note 3)
a 25§ C
Ib a ,r
Restore In a Input Bias Current
a 25§ C
IOUT
Restoring Current Available
a 25§ C
180
300
CMRR
Common Mode Rejection Ratio
(Note 2)
a 25§ C
60
70
180
VOS, Comp
2
3
7
II
mV
3
12
II
mA
II
mA
II
dB
TD is 3.5in
Restore Section
TD is 3.2in
EL4089C
DC Restored Video Amplifier
Open Loop DC Electrical Characteristics Ð Contd.
Provisional Supplies at g 15V, Load e 1 kX; TA e a 25§ C
Parameter
Max
Test
Level
Units
II
dB
Description
Temp
Min
Typ
Power Supply Rejection Ratio (Note 4)
a 25§ C
60
90
VTHRESHOLD
HOLD Logic Threshold
a 25§ C
0.8
2.0
II
V
IIH, Hold
HOLD Input Current
@
Logic High
a 25§ C
1
5
II
mA
IIL, Hold
HOLD Input Current
@
Logic Low
a 25§ C
5
15
II
mA
Restore Section ÐContd.
PSRR
Supply Current
Isy, Hold
Supply Current (HOLD e 5V)
a 25§ C
4.8
6.0
9.0
II
mA
Isy, Sampling
Supply Current (HOLD e 0V)
a 25§ C
5.0
6.5
11.0
II
mA
Closed Loop AC Electrical Characteristics
Provisional Supplies at g 15V, Load e 150X and 15 pF. Rf and Rg e 300X; AV e 2, TA e 25§ C. (See Note 7 about Test Fixture)
Parameter
Description
Min
Typ
Max
Test
Level
Units
Amplifier Section
SR
Slew Rate (Note 5)
500
V
V/ms
SR
Slew Rate with g 5V Supplies
(Note 5)
275
V
V/ms
BW
Bandwidth
g 5V Supplies
b 3 dB
b 3 dB
60
55
V
V
MHz
MHz
BW
Bandwidth
g 5V Supplies
g 0.1 dB
g 0.1 dB
25
23
V
V
MHz
MHz
dG
Differential Gain
at 3.58 MHz (Note 6)
VS e g 15V
VS e g 5V
0.02
0.03
V
V
%
%
dPh
Differential Phase
at 3.58 MHz (Note 6)
VS e g 15V
VS e g 5V
0.05
0.06
V
V
§
§
25
V
V/ms
SR
Restore Amplifier Slew Rate
(Test Circuit) 20%–80%
THE
Time to Enable Hold
25
V
ns
THD
Time to Disable Hold
40
V
ns
Note
Note
Note
Note
Note
Note
Note
1: For current feedback amplifiers, AVOL e ROL/RINb.
2: VCM e g 10V for VS e g 15V.
3: Measured from S/H Input to amplifier output, while restoring.
4: VOS is measured at VS e g 4.5V and VS e g 16V, both supplies are changed simultaneously.
5: SR measured at 20% to 80% of a 4V pk-pk square wave.
6: DC offset from b0.714V through a 0.714V, ac amplitude is 286 mVp-p, equivalent to 40 ire.
7: Test fixture was designed to minimize capacitance at the IN b input. A ‘‘good’’ fixture should have less than 2 pF of stray
capacitance to ground at this very sensitive pin. See application notes for further details.
3
TD is 3.2in
Restore Section
EL4089C
DC Restored Video Amplifier
Typical Performance Curves
Supply Current vs Temperature
VS e g 15V
Supply Current
vs Supply Voltage
4089 – 2
4089 – 3
Restoring Current
vs Temperature
Amplifier Input Current
vs Die Temperature
4089 – 4
4089 – 5
Amplifier Output Voltage
vs Die Temperature;
VS e g 15V
Amplifier Offset Voltage
vs Die Temperature
4089 – 6
4089 – 7
4
EL4089C
DC Restored Video Amplifier
Typical Performance Curves Ð Contd.
CMRR for Amplifier and
Restore Section
vs Die Temperature
Transimpedance (ROL)
vs Die Temperature
4089 – 8
4089 – 9
Relative Frequency Response
for Various Gains, RF e 300X
Frequency Response vs Supply
AV e 2; RF e 300
4089 – 10
4089 – 11
Frequency Response Flatness for Various
Load and Supply Conditions
AV e 2; RF e 300
Frequency Response Flatness vs Supply
AV e 2; RF e 300
4089 – 12
4089 – 13
5
EL4089C
DC Restored Video Amplifier
Typical Performance Curves Ð Contd.
Differential Gain vs DC Input
Offset; AV e 2, FO e 3.58 MHz,
RL e 150X
Frequency Response Flatness
vs CIN b ; AV e 2; RF e 300
4089 – 14
4089 – 15
Differential Phase vs DC Input
Offset; AV e 2; FO e 3.58 MHz;
RL e 150X
4089 – 16
8-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
8-Lead SO
Maximum Power Dissipation
vs Ambient Temperature
4089 – 17
4089 – 18
6
EL4089C
DC Restored Video Amplifier
The RX1 resistor is in the circuit purely to simulate some external source impedance, and is not
needed as a real component. Likewise for RX2.
The 75X back terminating resistor RXT is recommended when driving 75X cables.
Typical Application
The EL4089 can be used to DC-restore a video
waveform (see Fig. 1). The above circuit forces
the cable driving video amplifier’s output to
ground when the HOLD pin is at a logic low.
The board layout should have a ground plane underneath the EL4089, with the ground plane cut
away from the vicinity of the VIN b pin, (pin 1).
This helps to minimize the stray capacitance on
pin 1.
The ‘‘correction voltage’’ is stored on capacitor
CX1, an external ceramic capacitor. The capacitor value is chosen from the system requirements. The typical input bias current to the video amplifier is 1 mA, so for a 62 ms hold time, and
a 0.01 mF capacitor, the output voltage drift is
6.2 mV in one line.
Power supply bypassing is important, and a
0.1 mF ceramic capacitor, from each power pin to
ground, placed very close to the power pins, together with a 4.7 mF tantalum bead capacitor, is
recommended.
The S/H amplifier can provide a typical current
of 300 mA to charge capacitor CX1, so with a
1.2 ms sampling time, the output can be corrected
by 36 mV in each line.
When both digital and Analog grounds are on the
same board, the EL4089 should be on the Analog
ground. The digital ground can be connected to
the Analog ground through a 100X –300X resistor, near the EL4089. This allows the digital signal a return path, while preventing the digital
noise from corrupting the analog ground.
Using a smaller value of CX1 increases both the
voltage that can be corrected, and the drift while
being held, likewise, using a larger value of CX1,
reduces the voltages.
4089 – 19
Figure 1
7
EL4089C
EL4089C
DC Restored Video Amplifier
Table of Charge Storage Capacitor vs Droop Charging Rates
Cap Value
nF
Droop in 60 ms
mV
Charge in 1.2 ms
mV
Charge in 4 ms
mV
10
33
100
6
1.8
0.6
36
11
3.6
120
36
12
Basic formulae are:
V (droop) e Ib a * (Line time b Sample time) / Capacitor
and V (charge) e IOUT * Sample time / Capacitor
For best results the source impedance should be
kept low, using a buffer for example.
pled during active video. Typically the sample is
made during the back porch period of horizontal
blanking. For this reason color composite signals,
which have color burst on the back porch, can
not be passed. See EL2090 or EL4093 for this application.
Because the S/H effectively shorts the input signal during Sample, the input should not be sam-
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes
in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any
circuits described herein and makes no representations that they are free from patent infringement.
January 1996 Rev B
WARNING Ð Life Support Policy
Elantec, Inc. products are not authorized for and should not be
used within Life Support Systems without the specific written
consent of Elantec, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform
when properly used in accordance with instructions provided can
be reasonably expected to result in significant personal injury or
death. Users contemplating application of Elantec, Inc. products
in Life Support Systems are requested to contact Elantec, Inc.
factory headquarters to establish suitable terms & conditions for
these applications. Elantec, Inc.’s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages.
Elantec, Inc.
1996 Tarob Court
Milpitas, CA 95035
Telephone: (408) 945-1323
(800) 333-6314
Fax: (408) 945-9305
European Office: 44-71-482-4596
8
Printed in U.S.A.