MAX7452ESA-T [MAXIM]
Consumer Circuit, BICMOS, PDSO8, 0.150 INCH, SOIC-8;
| 型号： | MAX7452ESA-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Consumer Circuit, BICMOS, PDSO8, 0.150 INCH, SOIC-8 |
| 文件： | 总4页 (文件大小：97K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3429; Rev 0; 9/04
MAX7452 Evaluation Kit
General Description
Features
♦ Single +5V Supply Operation
The MAX7452 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains
the MAX7452. The MAX7452 is a low-cost, high-perfor-
mance, complete front-end video-signal conditioner
with automatic gain control (AGC) and a user-
adjustable back-porch clamp. The device includes an
out-of-band noise filter, back-porch clamp, loss-of-sync
(LOS) detector, ±±dꢀ of AGC, and an output buffer
capable of driving either a 150Ω video load or a high-
impedance load. These features optimize the video
signal quality for further video processing through a
crosspoint device or video decoder. The EV kit oper-
ates from a single +5V power supply.
♦ Adjustable Back-Porch Clamp
♦ Output Buffer Drives Standard Video Load
♦ Jumper-Selectable Output Buffer Gain of 0dB or
+6dB
♦ Input Fault Detection with LOS Output
♦ AGC (±6dB Range)
♦ Jumper-Selectable AGC Enable/Disable
♦ Standard 75Ω Input/Output Termination
♦ Jumper-Selectable Input/Output Termination
♦ Surface-Mount Components
♦ Fully Assembled and Tested
Component List
Ordering Information
DESIGNATION QTY
DESCRIPTION
PART
TEMP RANGE
IC PACKAGE
MAX7452EVKIT
0°C to +70°C
8 SO-EP*
1µF ±10%, 10V X5R ceramic
capacitor (0±03)
C1
1
*EP = Exposed paddle.
TDK C1±08X5R1A105K
Quick Start
Recommended Equipment
0.1µF ±10%, 25V X7R ceramic
capacitors (0±03)
TDK C1±08X7R1E104K
C2, C3
2
2
• +5VDC power supply
• Adjustable reference voltage (1V to 3V) or power sup-
ply
75Ω PC board mount ꢀNC
connectors
IN, OUT
• Video-signal generator (e.g., Tektronix TG-2000)
JU1, JU2
JU3, JU4
R1, R2
U1
2
2
2
1
4
1
2-pin headers
• Video measurement equipment (e.g., Tektronix VM-
700A)
3-pin headers
75Ω ±1% resistors (0805)
MAX7452ESA (8-pin SO-EP)
Shunts
Procedure
The MAX7452 EV kit is fully assembled and tested.
Follow these steps to verify board operation. Do not
turn on the power supply until all connections are
completed:
—
—
MAX7452 PC board
1) Verify that a shunt is installed across jumper JU1
Component Suppliers
(75Ω input termination).
2) Verify that a shunt is not installed across jumper
SUPPLIER
PHONE
FAX
WEBSITE
JU2 (75Ω output series termination).
www.component
.tdk.com
TDK
847-803-±100 847-390-4405
3) Verify that a shunt is installed across pins 1 and 2 of
jumper JU3 (gain = 2).
Note: Indicate that you are using the MAX7452 EV kit when
contacting this supplier.
4) Verify that a shunt is installed across pins 2 and 3 of
jumper JU4 (AGC enabled).
5) Connect the output of the video-signal generator to
the IN ꢀNC connector on the MAX7452 EV kit.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX7452 Evaluation Kit
±) Connect the OUT ꢀNC connector on the EV kit to
the input of the video measurement equipment.
provided to apply a DC voltage that is used to set the
back-porch level. The back-porch clamp output level is
defined by the following equations:
7) Connect the power-supply ground to the GND pad.
GSET = 1 (gain = 2V/V)
ꢀACKPORCHLEVEL
8) Connect the +5V supply to the V pad on the EV kit.
CC
V
= V
ꢀPLVL
9) Connect the negative terminal of the adjustable ref-
erence voltage to the GND pad.
GSET = 0 (gain = 1V/V)
V
= V
/ 1.5
ꢀACKPORCHLEVEL
ꢀPLVL
10) Connect the positive terminal of the adjustable ref-
erence voltage to the ꢀPLVL pad.
An LOS test point is also provided on the EV kit. The
LOS output is logic high when the sync signal is not
present, indicating a loss of signal on the input for
approximately 15 horizontal lines.
11) Set the adjustable reference voltage to 1.8V.
12) Set the video-signal generator for the desired video
input signal, such as multiburst sweep. This signal
must contain sync information (i.e., CVꢀS or Y).
The video input channel on the MAX7452 EV kit is AC-
coupled, while the video output channel is DC-coupled.
ꢀoth the input termination and output series termination
can be configured with jumpers. The MAX7452 EV kit
operates from a single +5V power supply.
13) Turn on the power supply and the adjustable refer-
ence voltage and enable the video-signal generator.
14) Analyze the video output signal with the VM-700A
video measurement equipment.
Jumper Selection
Input Termination
The MAX7452 EV kit features an option to terminate the
video input channel to 75Ω or unterminated. Jumper
JU1 selects the input termination on the MAX7452 EV
kit. Table 1 lists the selectable jumper options.
Detailed Description
The MAX7452 EV kit is a fully assembled and tested
surface-mount circuit board that contains a MAX7452.
The MAX7452 provides complete front-end video-signal
conditioning and is designed to improve the quality of
standard-definition video signals. The MAX7452 also
provides out-of-band noise filtering, LOS detection,
user-adjustable back-porch clamp, AGC, and an output
buffer with selectable gains of 0dꢀ or +±dꢀ.
Table 1. JU1 Jumper Selection
VIDEO INPUT SIGNAL
SHUNT POSITION
TERMINATION
The MAX7452 EV kit features an option to disable the
AGC by setting the logic level at the AGCD pin of the
MAX7452. The AGC adjusts the overall amplitude of the
output signal until the sync amplitude equals the stan-
dard level. When the AGC is enabled (AGCD = logic
Installed (default)
Not installed
75Ω
Unterminated
Output Termination
The MAX7452 EV kit features an option to series terminate
the video output channel to 75Ω or unterminated. Jumper
JU2 selects the output termination on the MAX7452 EV
kit. Table 2 lists the selectable jumper options.
low), the video input signal is set to 1V
and then fed
P-P
into the output buffer. When the AGC is disabled
(AGCD = logic high), the video input signal is fed into
the output buffer without any adjustment of the gain.
The output buffer amplifies the video signal with a gain
of 1V/V or 2V/V, according to the logic level at the GSET
pin of the MAX7452.
Table 2. JU2 Jumper Selection
VIDEO OUTPUT SIGNAL
SHUNT POSITION
The MAX7452 EV kit has a feature to adjust the back-
porch level at the output. A ꢀPLVL PC board pad is
TERMINATION
Installed
Unterminated
Not installed (default)
75Ω
2
_______________________________________________________________________________________
MAX7452 Evaluation Kit
AGC and Output Buffer Gain Selection
The MAX7452 EV kit features an option to select the
AGC and output buffer gain. Jumper JU4 (AGCD) con-
trols the AGC enable and disable, while jumper JU3
(GSET) sets the output buffer gain. Table 3 lists the
selectable jumper options.
Table 3. JU3 and JU4 Jumper Selection
SHUNT POSITION
V
OUT
JU3 (GSET)
2 and 3 (low)
1 and 2 (high)
2 and 3 (low)
1 and 2 (high)
JU4 (AGCD)
2 and 3 (low)
2 and 3 (low)
1 and 2 (high)
1 and 2 (high)
1V
2V
fixed
P-P
P-P
fixed (default)
V
V
= V
IN
OUT
OUT
= 2V
IN
VCC
VCC
LOS
1
8
LOS
V
CC
C1
1µF
C2
0.1µF
GND
IN
VCC
1
GSET
JU3
2
2
3
7
6
GSET
OUT
IN
U1
C3
0.1µF
3
JU1
R2
75Ω
1%
MAX7452
OUT
R1
75Ω
1%
GND
VCC
JU2
1
BPLVL
AGCD
JU4
5
4
AGCD
BPLVL
2
3
Figure 1. MAX7452 EV Kit Schematic
_______________________________________________________________________________________
3
MAX7452 Evaluation Kit
Figure 2. MAX7452 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX7452 EV Kit PC Board Layout—Component Side
Figure 4. MAX7452 EV Kit PC Board Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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