The EL4102C VFE (Vi deo Front End) is de signed to perform all of the
input processing functions in an analog video system as well as provide
analog input processing for digital video systems. The EL4102C VFE
contains a 4:1 MUX input, a DC-restore amplifier and a variable gain
amplifier. The MUX input can be used to select which input to use. In a
digital system, the DC-restore and variable gain amplifiers allow the
input signal to be positioned and scaled to give optimum A-to-D conversions results. In an analog system these perform the brightnes s and
contrast operations. A buffered output of the MUX selection is also
available for use as a monitor output.
With a 500MHz bandwi dth and only 50mA supply cur rent, the
EL4102C is ideal for use in portable and fixed projectors, as well as
HDTV, DTV and other high performance vid e o ap plications.
A 3-wire digital interface enables full control of the input selection, as
well as 0 to -18dB of gain and blanking operations.
The EL4102C is availabl e in t he QSOP24 pac kage a nd is spec ified for
operation over the -40°C to +85°C temperature ran ge.
onnection Diagram
SAMPLE PULSE
V
I/P0
V
I/P1
V
I/P2
V
I/P3
+5V
1
HOLD
2
GNDL2
3
IN0
4
VS1+
5
IN1
6
0V
GNDI
7
IN2
8
-5V
VS-
9
IN3
CAP
DCREF
DCFDBK
VFDBK
VOUT
VS2+
VS-
MOUT
MFDBK
24
23
DCV
22
21
20
19
+5V
18
-5V
17
16
C
H
0.33nF
R
GV
R
FV
Video Out
RL=150Ω
Monitor Out
R
RL=150Ω
FM
R
GM
August 30, 2001
10
ENB
SDI
SCLK
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 . W e recommend checking the revision level befo re finalization of your design documentation.
Values beyond absolute maximum ratings can cause the device to be prematurely damaged. Absolute maximum ratings are stress ratings only
and functional device operation is not implied.
Supply Voltage (V
EL4102C - Preliminary
Input VoltageV
to VS-)11V
S+
= 25°C)
A
- - 0.3V, VS+ +0.3V
S
Storage Temperature Range-65°C to +150°C
Ambient operating Temperature-40°C to +85°C
Operating Junction Temperature125°C
Power DissipationSee Curves
Important Note:
All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the
specified temperature and are pulsed tests, therefore: T
+Positive Supply Current 1 in StandbyStandby3.857.3mA
S1S
I
-Negative Supply Current in StandbyStandby0.5711.3mA
SS
I
+Positive Supply Current 2 in StandbyStandby-10-10µ A
S2S
V
+, VS2+ Positive Supply Voltage4.55.05.5V
S1
V
-Negative Supply Voltage-4.5-5.0-5.5V
S
Input
IbInput Bias CurrentV
IboInput Bias Current Drift with Temp.V
V
IH
V
IL
V
IP
V
IN
I
IDL
I
IDH
I
IL
I
IH
Input High Voltage2V
Input Low Voltage0.8V
Input V oltage Swing, Pos.Saturated Input, Att. code = 010103.353.5V
Input V oltage Swing, Neg.Saturated Input, Att. code = 01010-3.5-3.39V
Low Input Current for SCLK and ENBVIN = 0V5085150µA
High Input Current for SCLK and ENBVIN =5V00.110µ A
Low Input Current for SDI, PDWN, HOLDVIN = 0V154875µA
High Input Current for SDI, PDWN, HOLDVIN =5V00.110µ A
tshSample and Hold Delay Time15ns
tsuData Set Up TimeTBD10TBDns
thData Hold TimeTBD10TBDns
fclkSerial Clock RateTBD5MHz
tsueEnable Set Up TimeTBD10ns
theEnable Hold TimeTBD10ns
tpdClock to Data Output DelayC
Output
V
OSM
V
OS
T
CVOS
V
+Output Voltage Swing, Pos.Attenuator = 0dB, Monitor & Video Outputs3.443.5V
O
V
-Output Voltage Swing, Neg.Attenuator = 0dB, Monitor & Video Outputs-3.5-3.43V
O
V
SDO
V
SDO
Output Offset Voltage - MonitorVIN = 0V-40030420mV
DC-restore Offset Voltageauto-zero on, DC
Output Offset Voltage Drift - Videoauto-zero on15µV/°C
highSerial Data Output HighIL = +1mA4.7V
lowSerial Data Output LowIL = -1mA0.25V
SRSlew Rate - Video Out (20%-80%)V
SRMSlew Rate - Monitor Out (20%-80%)V
OSOutput Overshoot, VideoV
OSMOutput Overshoot, MonitorV
tsSettling Time to 1%, VideoHold ModeTBDns
tsmSettling Time to 1%, MonitorTBDns
V
REF
tsdDC-restore - Settling Time to 1%Sample Mode On1.2µS
V
OHS
V
OSB
I
CCL
I
DC
BW3dB Bandwidth, Video OutAttenuator = 00000TBDMHz
BWM3dB Bandwidth, Monitor OutTBDMHz
0.1BW±0.1dB Flat Bandwidth, Video OutAttenuator = 00000TBDMHz
0.1BWM±0.1dB Flat Bandwidth, Monitor OutTBDMHz
VpPeaking, VideoTBDdB
VpmPeaking, MonitorTBDdB
dPDiff. Phase @3.58MHz, VideoTBD°
dGDiff. Gain @3.58MHz, VideoTBD%
dPMDiff. Phase @3.58MHz, MonitorTBD°
dPGDiff. Gain @3.58MHz, MonitorTBD%
e
n
e
nm
1. Total unwanted output normalized by wanted (or expected) output; add -10dB to get channel-to-channel isolation
Output Short Circuit CurrentRL = 10Ω, Source or Sink65100mA
= 4V
OUT
P-P
= 4V
OUT
P-P
= 1V
OUT
P-P
= 1V
OUT
P-P
DC-restore Reference Voltage RangeVIN = -2V to +2V-2-2V
DC-restore - Video Output Hold StepS - H Transition-1.1mV
DC-restore - Offset vs. Black LevelSample Mode On-1-0.61mV/V
DC-restore - Charge Current Limit, I
DC-restore - Droop Current, I
Noise Voltage at Input for V
Noise Voltage at Input for M
B7Standby - Power Down
B6Gain Bit 4
B5Gain Bit 3
B4Gain Bit 2
B3Gain Bit 1
B2Gain Bit 0
B1Input Select Bit 1
B0Input Select Bit 0
Serial Timing Diagram
ENB
t
t
HE
SE
EL4102C - Preliminary
500MHz Video Front End: 4-1 MUX, VGA & DC-Restore
Tt
r
t
t
f
t
HE
SE
EL4102C - Preliminary
SCLK
SDI
t
SD
t
HD
B7B6B5B4-B2B1B0
MSBLSB
Load MSB first, LSB last
Serial Timing Parameters
ParameterExampleDescription
T≥100 nsClock Period
t
r/tf
t
HE
t
SE
t
HD
t
SD
t
w
t
w
0.05 x TClock Rise/Fall Time
≥40nsENB Hold Time
≥40nsENB Setup Time
≥40nsData Hold Time
≥40nsData Setup Time
0.50 x TClock Pulse Width
t
5
Page 6
EL4102C - Preliminary
500MHz Video Front End: 4-1 MUX, VGA & DC-Restore
Pin Descriptions
Pin NumberPin NamePin TypePin Description
1HOLDLo gic InputHold pulse for DC-restore function
EL4102C - Preliminary
2GNDL2Logic GroundLogic ground for “hold” buffer
3IN0High Frequency Signal Video input #0
4V
5IN1High Frequency Signal Video input #1
6GNDIAnalog SignalIntermediate reference for attenuation function
7IN2High Frequency Signal Video input #2
8V
0IN3High Frequency Signal Video input #3
10ENB
11SDILogic InputSerial input data stream
12SCLKLogic InputSerial data stream clock
13SDOLogic OutputSerial output data stream for connection to cascaded chip
14P
15GNDLLogic GroundLogic ground for logic buffers
16M
17M
18V
19V
20V
21V
22DC
23DC
24CAPAnalog SignalSample storage capacitor for DC-restore circuit
+PowerPositive power pin for quiet supply currents
S1
-PowerNegative power pin
S
Logic InputEnable (negative true) input for loading serial data stream
DWN
FDBK
OUT
-PowerNegative power pin
S
+PowerPositive power pin for heavy, pulsatile supply currents
S2
OUT
FDBK
FDBK
REF
Logic InputPower down input to put chip in low current standby mode
High Frequency Signal Monitor amplifier feedback
High Frequency Signal Monitor amplifier output
High Frequency Signal Video amplifier output
High Frequency Signal Video amplifier feedback
Analog SignalInput to sample circuit
Analog SignalReference DC voltage representing black level
6
Page 7
Block Diagram (Gain of 1)
Input Video
Input Video
Input Video
IN0
IN1
IN2
EL4102C - Preliminary
EL4102C - Preliminary
500MHz Video Front End: 4-1 MUX, VGA & DC-Restore
+
V
S
M
FDBK
+
X
M
OUT
+
V
-
OUT
750
V
FDBK
DC
FDBK
+
-
DC
REF
750
Input Video
IN3
ENB
SDI
SCLK
GNDLGNDIGNDL2VS-P
7
DWN
HOLD
CAP
SD0
C
H
Page 8
EL4102C - Preliminary
500MHz Video Front End: 4-1 MUX, VGA & DC-Restore
Applications Information
Using the Serial Data Output Connection for a
Multi-chip Design
EL4102C - Preliminary
In a system design that uses three chips, (i.e. RGB,
YUV, YPrPb systems) the control signal may be "daisy
chained" through the three chips. This gives an advantage in that the control wil l be updated simult aneously
on the three channels.
Figure xx shows the control signal waveforms when
using this configur ation. Note, that the last data bit
clocked into the three chips occurs on the last positive
clock edge that is within the enabled period . This will be
D0 in the first chip, D8 and D16 on the second two
chips. The rising edge of /ENB will then simultaneously
The serial data out (SDO) of chip one is con nected to th e
serial data in (SDI) of chip two, similarly, chip two SDO
is connected to SDI on chip three. The clock (SCLK)
and enable (/ENB) signals are connected in parallel to all
three chips. See figure yy for suggested interconnect of
the control signals.
transfer the data internally to th e chip. Typicall y the data
for each chip is held as an image in the micro-co ntro ller
system; the load operati on would prepare the up date
information as a 24-bit word ready for shifting into the
three chips.
8
Page 9
EL4102C - Preliminary
500MHz Video Front End: 4-1 MUX, VGA & DC-Restore
EL4102C - Preliminary
General Disclaimer
Specifications contained in this data sheet are in effect as of the publicat ion date shown. Elantec, Inc. re serves the r ight to make changes in th e circuitry or specifications cont ained herein at a ny time without notice. Elantec , Inc. assumes no res ponsibili ty for t he us e of an y circuits descr ibed
herein and makes no representations that they are free from patent infringement.
WARNING - 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 intend ed to sup-
Elantec Semiconductor, Inc.
675 Trade Zone Blvd.
Milpitas, CA 95035
Telephone: (408) 945-1323
(888) ELANTEC
Fax:(408) 945-9305
European Office: 44-118-977-6020
Japan Technical Center: 81-45-682-5820
port 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 applicatio n of Elantec, Inc. P roducts in Li fe 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 cov er injury to persons or prop erty or
other consequential damages.
August 30, 2001
9
Printed in U.S.A.
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