MAXIM MAX4383EVKIT

19-2792; Rev 0; 3/03
MAX4383 Evaluation Kit
Features
♦ Video Filter Solution for ATSC and HighResolution Graphics Applications
♦ 5-Pole Active Multiple Feedback (Rauch) Video Filter
♦ 30MHz Bandwidth at -3dB (typ)
♦ >40dB Attenuation at 74.25MHz
♦ +5V Single-Supply or ±5V Dual-Supply Operation
♦ Surface-Mount Construction
♦ Fully Assembled and Tested
♦ Eliminates Costly Inductors with More Accurate
R-C Components
Ordering Information
PART
TEMP RANGE
IC PACKAGE
MAX4383EVKIT
0°C to +70°C
14 TSSOP
Simplified Circuit
R13
R12
R2
R7
C1
C4
R11
VCC
R3
R1
INPUT
R14
VCC
U1A
R5
R6
VCC
C2
U1B
VEE
R16
C6
R9
C3
VEE
VCC
U1C
R4
R15
VEE
R10
R8
C5
OUTPUT
U1D
VEE
Typical Application Circuit
LOWPASS FILTER
G = 2V/V
R15
ZO = 75Ω
DAC
MPEG ENCODER
R16
DAC
LOAD
DISPLAY
DOES
VIDE
O
MAX4383 EV Kit
________________________________________________________________ Maxim Integrated Products
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.
1
Evaluates: MAX4383
General Description
The MAX4383 evaluation kit (EV kit) demonstrates the
capability of the high-speed MAX4383 op amp configured in a 5-pole, lowpass, multiple feedback (Rauch)
filter that provides a Butterworth response with a bandwidth of -3dB at 30MHz (typ). This circuit can be used
for video anti-aliasing and reconstruction filtering for
HDTV, Progressive DVD, and XGA resolution graphics
displays. The MAX4383 EV kit is designed to drive a
75Ω back-terminated load, common in video applications, with an overall gain of 1. The MAX4383 EV kit is a
fully assembled and tested surface-mount board that
operates from either a +5V single supply or ±5V dual
supplies.
Evaluates: MAX4383
MAX4383 Evaluation Kit
Component Suppliers
PHONE
FAX
Murata
SUPPLIER
770-436-1300
770-436-3030
www.murata.com
WEBSITE
Taiyo Yuden
800-348-2496
847-925-0899
www.t-yuden.com
TDK
847-803-6100
847-390-4405
www.component.tdk.com
Please indicate that you are using the MAX4383 when contacting these suppliers.
Component List
Required equipment:
• Dual ±5.0V DC power supply
• Signal generation platform (e.g., Tektronix TG 2000)
DESIGNATION
QTY
C1, C4
2
3.3pF ±0.25pF, 50V C0G ceramic
capacitors (0603)
TDK C1608C0G1H3R3CT
1
68pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H680J or
TDK C1608C0G1H680JT
1
27pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H270J or
TDK C1608C0G1H270JT
1) Connect the output from the 75Ω video signal generator to the INPUT BNC connector on the EV kit.
1
33pF ±5%, 50V C0G ceramic
capacitor (0603)
Taiyo Yuden UMK107CG330JZ or
TDK C1608C0G1H330JT
1
100pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101J
TDK C1608C0G1H101JT
3) Connect the +5.0V supply to the VCC pad. Connect
ground to the GND pad.
4) Connect the -5.0V supply to the VEE pad. For singlesupply (+5.0V) operation, connect VEE to ground
and bias the input appropriately.
C7, C9
2
10µF ±20%, 6.3V X5R ceramic
capacitors (0805)
Taiyo Yuden JMK212BJ106MG or
TDK C2012X5R0J106M
C8, C10
2
0.1µF ±10%, 25V X7R ceramic
capacitors (0603)
TDK C1608X7R1E104K
R1, R2, R4, R5,
R7–R13
11
210Ω ±1% resistors (0805)
R3
1
100Ω ±1% resistor (0805)
C2
DESCRIPTION
Quick Start
• Video measurement set (e.g., Tektronix VM 700A)
The MAX4383 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below for board
operation. Do not turn on the power supply until all
connections are completed.
Procedures
C3
C5
C6
R6
1
121Ω ±1% resistor (0805)
R14, R15, R16
3
75Ω ±1% resistors (0805)
R17
0
Not installed, resistor (0805)
U1
1
MAX4383EUD (14-pin TSSOP)
INPUT, OUTPUT
2
BNC connectors
None
1
MAX4383 PC board
2
2) Connect the input of the 75Ω video measurement set
to the OUTPUT BNC connector on the EV kit.
5) Set the signal generator for multiburst sweep.
6) Turn on the ±5.0V DC power supply.
7) Analyze the filtered output signal with the VM700
video measurement set.
Note: The generator (signal source) and the video test
set (load) must be 75Ω terminated, and the signal
source must also provide a DC return to ground. This is
the function of R16 and R15, respectively. These resistors are set to 75W in the MAX4383 EV kit. If a 50Ω system is used, R16 must be changed to 50Ω. If a 50Ω
analyzer is used, R15 must be 50Ω. The DAC must supply a DC voltage to bias the input of the MAX4383. If
your DAC has insufficient bias to do this, add a 5.6kΩ
resistor between VCC and the junction of R16 and R14.
_______________________________________________________________________________________
MAX4383 Evaluation Kit
The MAX4383 EV kit is a fully assembled and tested
surface-mount circuit board that demonstrates the
capability of the high-speed MAX4383 op amp configured in a 5-pole, active lowpass multiple feedback filter
circuit. The filter can be used for video anti-aliasing or
as a reconstruction filter for ATSC (HDTV) or high-resolution (XGA) graphics. The circuit has a 75Ω DAC load
(R16), a gain of 2V/V, and a 75Ω source (R15) for driving a 75Ω back-terminated load to an overall gain of 1.
The board operates from either a +5V single supply or
±5V dual supplies.
GAIN vs. FREQUENCY
MAX4383EV fig01
5
0
-5
GAIN (dB)
-10
-15
-20
-25
-30
-35
-40
-45
1
10
100
FREQUENCY (MHz)
Figure 1. Gain vs. Frequency Response of the EV Kit Filter
The MAX4383 EV kit demonstrates a lower cost, but
more accurate way to design video filters. Using R-C,
rather than L-C components, it provides a 30MHz, -3dB
bandwidth with >40dB rejection at 74.25MHz (Figure 1),
as well as group-delay compensation and buffering
using a single MAX4383 quad op amp. The improved
tolerance of R-C, versus L-C components, removes the
need for production tuning. Some initial tuning may be
required to account for the variation in the DAC load
and parasitic components due to PC board layout differences. The MAX4383 EV kit uses dual supplies, but the
MAX4383 can be run from a single supply.
The MAX4383 EV kit is a Rauch, or multiple feedback
realization of a 5-pole modified Legendre characteristic
using one 1st-order +6dB gain stage and two 2nd-order
unity-gain stages. The final stage is a 1st-order group
delay compensator, which drives the back-terminated
75Ω load to an overall unity gain. There are three sensitive points in the circuit; R14, which controls the real
pole, C1 and C4, that control the high-frequency poles,
and C5 that sets the group delay compensation.
The MAX4383 EV kit comes with a 75Ω termination (R16)
and a BNC connector (INPUT) in place of the DAC normally found at the input for measurement purposes, and
this reduces the gain to -6dB overall. The values of R14
and R16 are based on the DAC with a typical load resistance of 25Ω to 35Ω. To accommodate different load
resistors, adjust the value of the R14 and the C6 product
accordingly. The values of C1 and C4 reflect a two-sided
PC board with minimal ground plane around the op
amps pins. C5 adjusts the group delay compensation.
Adjust the value of C1 and C4 for bandwidth before
adjusting C5 for group-delay variation compensation.
_______________________________________________________________________________________
3
Evaluates: MAX4383
Detailed Description
Evaluates: MAX4383
MAX4383 Evaluation Kit
VCC
R14
75Ω
INPUT
3
BNC
GND
C7
10µF
C9
10µF
C8
0.1µF
C10
0.1µF
11
4
INA+
VEE
VEE OUTD
VCC
C6
100pF
R16
75Ω
R15
75Ω
14
OUTPUT
BNC
R11
210Ω
R13
210Ω
R17
OPEN
U1
2
INA-
MAX4383
IND-
13
R12
210Ω
1 OUTA
R1
210Ω
C2
68pF
IND+
12
C5
33pF
R3
100Ω
R2
210Ω
6
INB-
OUTC
INB+
INC+
R10
210Ω
R9
210Ω
C4
3.3pF
R7
210Ω
8
C1
3.3pF
5
10
R4
210Ω
R8
210Ω
7
R5
210Ω
OUTB
INC-
9
R6
121Ω
C3
27pF
ALL RESISTORS ARE ±1%.
Figure 2. MAX4383 EV Kit Schematic
4
_______________________________________________________________________________________
MAX4383 Evaluation Kit
Evaluates: MAX4383
Figure 3. MAX4383 EV Kit Component Placement Guide—
Component Side
Figure 4. MAX4383 EV Kit PC Board Layout—Component Side
Figure 5. MAX4383 EV Kit PC Board Layout—Solder Side
Figure 6. MAX4383 EV Kit Component Placement Guide—
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.