MAXIM MAX7462UUA

19-3790; Rev 1; 9/05
Single-Channel Video Reconstruction Filters
and Buffers
Features
The MAX7462/MAX7463 single-channel, standard-definition, integrated video reconstruction filters and buffers
are ideal for anti-aliasing and digital-to-analog smoothing
video applications or wherever analog video is reconstructed from digital data (such as cable/satellite/terrestrial set-top boxes and DVRs).
The MAX7462 includes a disable function, which
places the output in a high-impedance state allowing
multiplexing of multiple output signals. It also has an
external gain control that sets the output buffer gain to
either +6dB or +9.5dB. The higher gain setting allows a
lower DAC output signal than the standard 1VP-P signal. The MAX7463 output buffer has a fixed gain of
+6dB.
The MAX7462/MAX7463 operate from a single +5V
supply and have a flat passband out to 5MHz with a
stopband attenuation of -43dB (typ) at 27MHz.
♦ Standard-Definition CVBS Video Reconstruction
Filters and Buffers
♦ Passband: -0.05dB at 5MHz
♦ Stopband: -43dB at 27MHz
♦ Selectable Gain: +6dB and +9.5dB (MAX7462)
♦ Output Disable (MAX7462)
♦ Drives 2VP-P into Two 150Ω Video Loads
♦ Output Black Level < 1V for DC-Coupled Output
♦ Very Small µMAX and SO Packages
Ordering Information
PART
These devices can drive two standard 150Ω AC-coupled or DC-coupled video loads. The output black level
of the MAX7462/MAX7463 is less than 1V for DC-coupled outputs.
The MAX7462 is available in an 8-pin µMAX® package
and an 8-pin SO package. The MAX7463 is available in
an 8-pin SO package. All devices are specified over
the 0°C to +85°C temperature range.
PINPACKAGE
BUFFER GAIN
(dB)
OUTPUT
DISABLE
MAX7462UUA*
8 µMAX
+6/+9.5
selectable
Yes
MAX7462USA
8 SO
+6/+9.5
selectable
Yes
MAX7463USA
8 SO
+6 fixed
No
Note: All parts are specified over the 0°C to +85°C temperature
range.
*Future product—contact factory for availability.
Applications
Cable/Satellite/Terrestrial Set-Top Boxes
Pin Configurations appear at end of data sheet.
DVRs
Hard-Disk Recorders
Functional Diagram
+5V
VCC
MAX7462
0.1µF
DAC
75Ω
*
ZO = 75Ω
220µF
IN
LOWPASS
FILTER
+6dB/+9.5dB
OUT
75Ω
75Ω
*
ZO = 75Ω
220µF
75Ω
GND
GAIN
DISABLE
*OPTIONAL
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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
MAX7462/MAX7463
General Description
MAX7462/MAX7463
Single-Channel Video Reconstruction Filters
and Buffers
ABSOLUTE MAXIMUM RATINGS
VCC to GND ........................................................................+6.0V
All Other Pins to GND ...-0.3V to the lower of (VCC + 0.3V) and +6V
Maximum Current into Any Pin Except VCC and GND .....±50mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) …...... 362mW
8-Pin SO (derate 5.9mW/°C above +70°C) .......... 470.6mW
Operating Temperature Range...............................0°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%, CL = 0 to 20pF, RL = 75Ω, CIN = 0.1µF, gain = +6dB, DISABLE = VCC (MAX7462), TA =TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, and TA = +25°C.)
PARAMETER
CONDITIONS
Passband Response
f = 100kHz to 5MHz, relative to 100kHz
Stopband Attenuation
f ≥ 27MHz
Output Dynamic Swing
Gain = GND (MAX7462)
Output Sync Tip Clamp Level
After termination (Note 1)
MIN
TYP
MAX
UNITS
-0.65
-0.05
+0.65
dB
2.0
2.4
VP-P
0.45
0.55
V
39
0.30
43
dB
Group Delay Deviation
f = 100kHz to 4.2MHz
Differential Gain
Five-step modulated staircase
0.15
11
%
Differential Phase
Five-step modulated staircase
0.15
Degrees
Signal-to-Noise Ratio
Output signal (2VP-P) to RMS noise (100Hz to 5MHz)
Low-Frequency Gain Accuracy
f =100kHz, relative to a gain of +6dB
Line Time Distortion
18µs, 100 IRE bar
0.1
Field Time Distortion
130 lines, 18µs, 100 IRE bar
0.1
%
Power-Supply Rejection Ratio
VIN = 100mVP-P, f = 100kHz
35
dB
Supply Current
No load
25
75
-3
dB
+3
Note 1: Measured after 75Ω back-match resistor. Assume a 75Ω termination resistor.
2
ns
_______________________________________________________________________________________
%
%
35
mA
Single-Channel Video Reconstruction Filters
and Buffers
MAX7462/63 toc02
MAX7462/63 toc01
2.0
1.5
1.0
AMPLITUDE (dB)
AMPLITUDE (dB)
0
-20
-40
0.5
0
-0.5
-1.0
-60
-1.5
NORMALIZED TO 0dB
NORMALIZED TO 0dB
-2.0
-80
0.1
1
10
0.1
100
PHASE RESPONSE
vs. FREQUENCY
GROUP DELAY vs. FREQUENCY
150
90
GROUP DELAY (ns)
100
MAX7462/63 toc04
100
MAX7462/63 toc03
200
PHASE (DEGREES)
10
1
FREQUENCY (MHz)
FREQUENCY (MHz)
50
0
-50
80
70
-100
60
-150
-200
50
0.1
1
10
0.1
FREQUENCY (MHz)
2T RESPONSE
MODULATED 12.5T RESPONSE
MAX7462/63 toc05
MAX7462/63 toc06
OUT
250mV/div
OUT
250mV/div
IN
250mV/div
IN
250mV/div
200ns/div
10
1
FREQUENCY (MHz)
200ns/div
_______________________________________________________________________________________
3
MAX7462/MAX7463
Typical Operating Characteristics
(VCC = +5V ±5%, CL = 0 to 20pF, RL = 75Ω, CIN = 0.1µF, gain = +6dB, DISABLE = VCC (MAX7462), TA =TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, and TA = +25°C.)
PASSBAND AMPLITUDE
vs. FREQUENCY
AMPLITUDE vs. FREQUENCY
Typical Operating Characteristics (continued)
(VCC = +5V ±5%, CL = 0 to 20pF, RL = 75Ω, CIN = 0.1µF, gain = +6dB, DISABLE = VCC (MAX7462), TA =TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, and TA = +25°C.)
SUPPLY CURRENT vs. TEMPERATURE
VIN = +2V
NO LOAD
DIFFERENTIAL PHASE (deg)
30
20
10
0
17
34
51
68
85
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
MAX7462/63 toc08
DIFFERENTIAL GAIN (%)
DIFFERENTIAL GAIN
MAX7462/63 toc07
40
SUPPLY CURRENT (mA)
MAX7462/MAX7463
Single-Channel Video Reconstruction Filters
and Buffers
1
2
3
4
5
6
7
6
7
DIFFERENTIAL PHASE
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
1
2
3
4
5
TEMPERATURE (°C)
OUT RESPONSE TO A FIELD
SQUARE WAVE
MULTIBURST RESPONSE
MAX7462/63 toc10
MAX7462/63 toc09
OUT
250mV/div
OUT
500mV/div
IN
250mV/div
IN
500mV/div
2ms/div
10µs/div
DISABLE TURN-OFF TIME
DISABLE TURN-ON TIME
MAX7462/63 toc12
MAX7462/63 toc11
OUT
1V/div
OUT
1V/div
GND
GND
DISABLE
2V/div
DISABLE
2V/div
GND
GND
100ns/div
4
100ns/div
_______________________________________________________________________________________
Single-Channel Video Reconstruction Filters
and Buffers
PIN
NAME
FUNCTION
MAX7462
MAX7463
1
1
IN
2
—
GAIN
3, 4, 5
3
GND
Ground
—
2, 4, 5, 6
N.C.
No Connection. Not internally connected. Connect to GND for better performance.
6
—
DISABLE
7
7
VCC
+5V Supply Input
8
8
OUT
Buffer Output. This output can be either AC- or DC-coupled. Use at minimum a 220µF
capacitor for AC-coupled loads.
Video Input. AC-couple IN with a series 0.1µF capacitor.
Gain Control Input. Connect GAIN to GND for a gain of +6dB (+2V/V). Connect GAIN to VCC
for a gain of +9.5dB (+3V/V).
Disable Input. Connect to VCC to enable the output buffer (normal operation). Connect to GND
to put the output buffer in a high-impedance state.
Detailed Description
The MAX7462/MAX7463 filters and buffers the analog
CVBS video outputs of DAC video-encoders in applications such as set-top boxes, hard-disk recorders, DVD
players, and digital VCRs. The MAX7462/MAX7463 consist of a lowpass filter and an output video buffer that can
drive two standard 150Ω video loads. These devices
operate from a single +5V supply and have a bandwidth
optimized for interlaced NTSC, PAL, and SDTV.
Filter
The reconstruction filter is a 4th-order Butterworth-type
response that features a maximally flat passband for
NTSC and PAL bandwidths. The stopband attenuation
is optimized for a video-encoder DAC sampling frequency of 27MHz (see the Typical Operating
Characteristics).
Output Buffer
The output buffer can drive two 150Ω video loads with
a 2VP-P signal. For the MAX7462, the output buffer gain
is selectable between +6dB and +9.5dB by using GAIN
(see Table 1). The MAX7463 has a fixed gain of +6dB.
The MAX7462/MAX7463 can drive an AC load or drive
the video load directly without using a large output
Table 1. Gain Setting Control (MAX7462)
GAIN
BUFFER GAIN (dB)
GND
+6
VCC
+9.5
capacitor. The output buffer can drive DC loads while
maintaining an output blanking level of less than 1V. The
blanking level allows the MAX7462/MAX7463 to meet the
digital TV interface specifications for DC coupling.
Applications Information
Input Considerations
Use a 0.1µF ceramic capacitor to AC-couple the input.
The input capacitor stores a DC voltage so that the output is clamped to the appropriate DC voltage level.
Output Considerations
The outputs are typically connected to a 75Ω series
back-match resistor followed by the video cable.
Because of the inherent divide-by-two of this configuration, the blanking level on the video cable is always
less than 1V, complying with industry-standard video
requirements such as the digital TV standard (which
allows up to 1VDC on the video cable) and the
European SCART standard (which allows up to 2VDC
on the video cable). The video buffer can also drive an
AC-coupled video load. Good video performance is
achieved with an output capacitor as low as 220µF.
Power-Supply Bypassing and Layout
The MAX7462/MAX7463 operate from a single +5V
supply. Bypass VCC to GND with a 0.1µF capacitor. In
addition, it is sometimes advantageous to connect a
10µF capacitor within the general vicinity of the video
circuitry. Place all other external components as close
to the device as possible.
_______________________________________________________________________________________
5
MAX7462/MAX7463
Pin Description
Single-Channel Video Reconstruction Filters
and Buffers
MAX7462/MAX7463
Pin Configurations
Chip Information
PROCESS: BiCMOS
TOP VIEW
IN 1
8
OUT
7
VCC
3
6
DISABLE
GND 4
5
GND
8
OUT
7
VCC
3
6
N.C.
N.C. 4
5
N.C.
GAIN 2
MAX7462
GND
µMAX/SO
IN 1
N.C. 2
MAX7463
GND
SO
6
_______________________________________________________________________________________
Single-Channel Video Reconstruction Filters
and Buffers
E
Ø0.50±0.1
8
INCHES
DIM
A
A1
A2
b
H
c
D
e
E
H
0.6±0.1
1
L
1
α
0.6±0.1
S
BOTTOM VIEW
D
MIN
0.002
0.030
MAX
0.043
0.006
0.037
0.014
0.010
0.007
0.005
0.120
0.116
0.0256 BSC
0.120
0.116
0.198
0.188
0.026
0.016
6°
0°
0.0207 BSC
8LUMAXD.EPS
4X S
8
MILLIMETERS
MAX
MIN
0.05
0.75
1.10
0.15
0.95
0.25
0.36
0.13
0.18
2.95
3.05
0.65 BSC
2.95
3.05
4.78
5.03
0.41
0.66
0°
6°
0.5250 BSC
TOP VIEW
A1
A2
A
α
c
e
b
FRONT VIEW
L
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
21-0036
REV.
J
1
1
_______________________________________________________________________________________
7
MAX7462/MAX7463
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
DIM
A
A1
B
C
e
E
H
L
N
E
H
INCHES
MILLIMETERS
MAX
MIN
0.069
0.053
0.010
0.004
0.014
0.019
0.007
0.010
0.050 BSC
0.150
0.157
0.228
0.244
0.016
0.050
MAX
MIN
1.35
1.75
0.10
0.25
0.35
0.49
0.19
0.25
1.27 BSC
3.80
4.00
5.80
6.20
0.40
SOICN .EPS
MAX7462/MAX7463
Single-Channel Video Reconstruction Filters
and Buffers
1.27
VARIATIONS:
1
INCHES
TOP VIEW
DIM
D
D
D
MIN
0.189
0.337
0.386
MAX
0.197
0.344
0.394
MILLIMETERS
MIN
4.80
8.55
9.80
MAX
5.00
8.75
10.00
N MS012
8
AA
14
AB
16
AC
D
C
A
B
e
0∞-8∞
A1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL
DOCUMENT CONTROL NO.
21-0041
REV.
B
1
1
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.
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© 2005 Maxim Integrated Products
Boblet
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.