MAX7439ETP+ [MAXIM]
Continuous Time Filter, 3 Func, Butterworth, Lowpass, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, TQFN-20;
| 型号： | MAX7439ETP+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Continuous Time Filter, 3 Func, Butterworth, Lowpass, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, TQFN-20 LTE 信息通信管理 有源滤波器 |
| 文件： | 总10页 (文件大小：387K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2857; Rev 0; 4/03
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
General Description
Features
The MAX7438/MAX7439 three-channel standard defini-
tion video reconstruction filters include a back-porch
clamp that sets the output blanking level of the video
signal to ground. Each channel of the MAX7438/
MAX7439 combines a lowpass filter with adjustable
high-frequency boost levels and an output buffer capa-
ble of driving two standard 150 video loads. The
blanking level of the output video signal on each chan-
nel is clamped to ground, eliminating the need for large
AC-coupling output capacitors. Direct input coupling
circuitry eliminates the need for AC-coupling input
capacitors. This DC-in/DC-out architecture results in
extremely low line-time distortion. The MAX7438/
MAX7439 are ideal for antialiasing and DAC smoothing
in digital video devices such as STBs, DVDs, PVRs,
and hard disk recorders. The MAX7438/MAX7439 oper-
ate from 5V dual supplies.
o Back-Porch of Video Output Signal Clamped to
Ground
o Eliminates Input/Output AC-Coupling Capacitors
o 0.1% Line-Time Distortion
o Stopband: 55dB at 27MHz
o Passband: 0.ꢀdB out to 5MHz
o Diff Gain = 0.05%, Diff Phase = 0.05 Degrees
o Output Clamped to Ground with Loss of Input
o Each Output Drives Two 150 Video Loads
o Up to 2dB of High-Frequency Boost Control
o Ideal for CVBS, Y/C (S-Video), and RGB (Y, P P )
b,
r
Outputs for NTSC, PAL, and SDTV
o Filter Bypass Mode
The three-channel MAX7438/MAX7439 are ideal for Y,
o Small 20-Pin 5mm ✕ 5mm Thin QFN Package
P , P , and RGB component video signals, three com-
b
r
posite video signals, and also Y/C plus CVBS video sig-
nals. Each filter channel achieves 60dB of attenuation at
27MHz and a maximally flat passband from DC to 5MHz.
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Thin QFN-EP*
20 Thin QFN-EP*
The MAX7438 offers an internal gain of +2V/V, while the
MAX7439 offers a gain of +3V/V.
MAX743ꢀETP
MAX7439ETP
*EP = Exposed paddle
Applications
Set-Top Boxes/HDR/DVD Composite, Component,
Pin Configuration appears at end of data sheet.
S-Video Output for
NTSC, PAL, SDTV
Game Consoles
Camcorders
Functional Diagram
ENCODER
DAC1
75
OUT1
IN1
LOWPASS
FILTER
GAIN/LEVEL
SHIFT
Z
= 75
0
75
75
75
Z
= 75
0
BACK-PORCH
DETECTOR
75
75
75
OUT2
OUT3
IN2
IN3
LOWPASS
FILTER
GAIN/LEVEL
SHIFT
Z
= 75
DAC2
DAC3
0
Z
= 75
0
MAX7438
MAX7439
75
75
75
LOWPASS
FILTER
GAIN/LEVEL
SHIFT
Z
= 75
0
Z
0
= 75
HFB1
HFB2
HFB3
HIGH-FREQUENCY
BOOST CONTROL/
BYPASS
75
75
BIAS
GENERATOR
GND
EXT
10k
V
= +5V
V
= -5V
SS
CC
________________________________________________________________ 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.
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
ABSOLUTE MAXIMUM RATINGS
V
V
to GND..............................................................-0.3V to +6V
to GND...............................................................-6V to +0.3V
OUT_ to GND ........................................................-2.5V to +3.5V
All Other Pins to GND ......................(V - 0.3V) to (V + 0.3V)
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
SS
SS
CC
Maximum Current into Any Pin ......................................... 50mA
Continuous Power Dissipation (T = +70°C)
A
20-Pin 5mm x 5mm Thin QFN (derate 20.8mW/°C
above +70°C)...........................................................1666.7mW
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
(V
= +5V 5ꢀ, V
= -5V 5ꢀ, R
= 10k
1ꢀ, R
= 15k
1ꢀ, R
= 1k
1ꢀ, no boost, R
OUT
= 75 ,
CC
SS
EXT
HFB_-1
HFB_-2
C
OUT
= 0 to 20pF, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
-0.6
-0.8
40
TYP
MAX
+0.6
+0.8
UNITS
f = 100kHz to 4.2MHz, no HF boost
Passband Response
dB
f = 100kHz to 5MHz, no HF boost
Stopband Attenuation
HF Boost Step Size
A
SB
f = 27MHz, relative to 100kHz
60
dB
dB
f = 4.2MHz
Bypass
0.45
0
50
No boost
Boost 1
Boost 2
Boost 3
Boost 4
280
360
670
850
HFB_ Voltage Range
V
mV
%
HFB_
1360
2250
3500
1700
2750
V
CC
MAX7438,
= 1V
0.05
0.05
0.05
0.05
0.2
0.5
0.5
0.5
0.5
0.5
0.5
V
IN
P-P
5-step modulated
staircase
Differential Gain
Differential Phase
dG
d
MAX7439,
= 670mV
V
IN
P-P
MAX7438,
= 1V
V
IN
P-P
5-step modulated
staircase
Degrees
MAX7439,
= 670mV
V
IN
P-P
P-P
P-P
MAX7438,
= 700mV
V
IN
f = 100kHz to 5MHz,
Total Harmonic Distortion
Signal-to-Noise Ratio
THD
SNR
%
V
= 0.7V
P-P
IN
MAX7439,
= 460mV
0.2
V
IN
Output signal (2V ) to P-P noise,
P-P
f = 100Hz to 5MHz
68
75
dB
Group Delay Deviation
Group Delay Matching
Line-Time Distortion
Field-Time Distortion
t
Deviation from 100kHz to 3.58(4.43)MHz
f = 100kHz
12
2
30
ns
ns
%
%
G
t
G(MATCH)
H
18µs, 100 IRE bar
0.1
0.2
DIST
DIST
V
130 lines, 18µs, 100 IRE bar
2
_______________________________________________________________________________________
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
ELECTRICAL CHARACTERISTICS (continued)
(V
= +5V 5%, V
= -5V 5%, R
= 10k
1%, R
= 15k
1%, R
= 1k
1%, no boost, R
OUT
= 75 ,
CC
SS
EXT
HFB_-1
HFB_-2
C
OUT
= 0 to 20pF, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Clamp Accuracy
Output blanking level relative to GND
-55
+55
mV
Back porch within the specified clamp
accuracy
Clamp Settling Time
50
Lines
dB
MAX7438
Gain at 100kHz
5.5
9
6
6.5
10
Low-Frequency Gain
MAX7439
9.54
Channel-to-channel gain matching,
f = 100kHz
Low-Frequency Gain Matching
t
+5
%
G
Input Voltage Range
THD < 0.5%
-0.5
-0.8
+1.8
+1.8
V
Output Voltage Range
V
f = 5MHz
V
OUT
Channel-to-Channel Crosstalk
Output Short-Circuit Current
Input Leakage Current at IN_
X
Channel-to-channel crosstalk, f = 5MHz
-60
50
1
dB
mA
µA
TALK
I
OUT_ shorted to GND or V
CC
SC
I
5
0.2
30
IN_
Bypass mode, boost 1 to boost 3
Boost 4
Input Leakage Current at HFB_
Input Resistance
I
µA
k
HFB_
500
4.75
-4.75
V
5.25
-5.25
160
CC
Supply Voltage Range
V
V
SS
I
V
V
V
= +5.25V, no load
= -5.25V, no load
110
110
30
CC
CC
SS
Supply Current
mA
dB
I
SS
160
Power-Supply Rejection Ratio
PSRR
= 100mV , f = 0 to 3.5MHz
IN P-P
Typical Operating Characteristics
(V
= +5V, V = -5V, R
= 150 , R
= 10k , no boost, T = +25°C, unless otherwise noted.)
CC
SS
OUT_
EXT
A
MAX7438
AMPLITUDE vs. FREQUENCY
MAX7439
AMPLITUDE vs. FREQUENCY
MAX7438
PASSBAND AMPLITUDE vs. FREQUENCY
10
0
10
0
2.5
2.0
1.5
1.0
0.5
0
BOOST 4
BOOST 3
BOOST 2
-10
-20
-30
-40
-50
-60
-70
-80
-10
-20
-30
-40
-50
-60
-70
-80
BOOST 1
-0.5
-1.0
-1.5
-2.0
NO BOOST
NORMALIZED TO 0dB
NORMALIZED TO 0dB
0.1
NORMALIZED TO 0dB
0.1
-2.5
1
10
100
1
10
100
0.1
1
10
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
_______________________________________________________________________________________
3
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
Typical Operating Characteristics (continued)
(V
= +5V, V = -5V, R
= 150 , R
= 10k , no boost, T = +25°C, unless otherwise noted.)
CC
SS
OUT_
EXT
A
MAX7438
CHANNEL RESPONSE (BYPASS MODE)
MAX7439
CHANNEL RESPONSE (BYPASS MODE)
MAX7439
PASSBAND AMPLITUDE vs. FREQUENCY
10
10
2.5
2.0
1.5
1.0
0.5
0
BOOST 4
BOOST 3
BOOST 2
0
-10
-20
-30
0
-10
-20
-30
BOOST 1
-0.5
-1.0
-1.5
-2.0
NO BOOST
-40
-50
-40
-50
NORMALIZED TO 0dB
NORMALIZED TO 0dB
NORMALIZED TO 0dB
-2.5
0.1
1
10
0.1
1
10
100
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX7438
GROUP DELAY vs. FREQUENCY
MAX7439
GROUP DELAY vs. FREQUENCY
DIFFERENTIAL GAIN
0.3
0.2
140
120
140
120
0.00 -0.04 0.01 -0.02 -0.04 -0.01
100
80
100
80
0.1
0.0
60
40
20
0
60
40
20
0
-0.1
-0.2
-0.3
0.1
1
10
1ST 2ND 3RD 4TH 5TH 6TH
0.1
1
10
FREQUENCY (MHz)
FREQUENCY (MHz)
DIFFERENTIAL PHASE
2T RESPONSE
12.5T RESPONSE
0.3
0.2
0.00 0.03 0.03 -0.02 -0.01 -0.02
0.1
IN_
200mv/div
IN_
200mv/div
0.0
-0.1
-0.2
-0.3
OUT_
200mv/div
OUT_
200mv/div
1ST 2ND 3RD 4TH 5TH 6TH
200ns/div
400ns/div
4
_______________________________________________________________________________________
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
Typical Operating Characteristics (continued)
(V
= +5V, V = -5V, R
= 150 , R
= 10k , no boost, T = +25°C, unless otherwise noted.)
CC
SS
OUT_
EXT
A
PASSBAND CHANNEL-TO-CHANNEL
CROSSTALK vs. FREQUENCY
SUPPLY CURRENT VS. TEMPERATURE
OUTPUT SOURCE IMPEDANCE vs. FREQUENCY
0
-20
140
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
105
70
I
CC
V
V
= +5V
= -5V
CC
SS
35
-40
0
-60
-35
-70
-105
-140
I
SS
-80
-100
0.1
1
10
-40
-15
10
35
60
85
0.1
1
10
FREQUENCY (MHz)
TEMPERATURE ( C)
FREQUENCY (MHz)
BACK-PORCH LEVEL OUTPUT VOLTAGE
vs. INPUT VOLTAGE
BACK-PORCH CLAMP VOLTAGE
vs. TEMPERATURE
100
75
50
50
25
0
25
0
-25
-50
-75
-100
-25
-50
-0.2
0.1
0.4
0.7
1.0
1.3
1.6
-40
-15
10
35
60
85
INPUT VOLTAGE (V)
TEMPERATURE ( C)
_______________________________________________________________________________________
5
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
Pin Description
PIN
NAME
GND
IN1
FUNCTION
1, 4, 7, 10,
11, 13, 15, 19
Ground
2
Channel 1 Video Input
Channel 1 High-Frequency Boost and Filter Bypass Control Input. Connect external resistors to HFB1
for high-frequency boost and filter bypass control. See Table 1.
3
HFB1
OUT1
5
6
Channel 1 Video Output
+5V Power Input
V
CC
8
OUT2
Channel 2 Video Output
9
V
-5V Power Input. Connect the backside exposed pad to V
Channel 3 Video Output
.
SS
SS
12
OUT3
HFB3
IN3
Channel 3 High-Frequency Boost and Filter Bypass Control Input. Connect external resistors to HFB3
for high-frequency boost and filter bypass control. See Table 1.
14
16
17
Channel 3 Video Input
Channel 2 High-Frequency Boost and Filter Bypass Control Input. Connect external resistors to HFB2
for high-frequency boost and filter bypass control. See Table 1.
HFB2
18
20
—
IN2
EXT
EP
Channel 2 Video Input
External Bias Resistor. Connect a 10k resistor from EXT to GND.
Exposed Paddle. Connect to V . Do not connect to GND.
SS
Table 1. External Resistor Values for Bypass Mode and High-Frequency Boost Control
NOMINAL BOOST (dB)/
BYPASS
NOMINAL BOOST (dB)/
BYPASS
R
R
V (V)
HFB_
HFB_-1
(kΩ)
HFB_-2
(kΩ)
MODE
(V
CC
= 5V)
(MAX743ꢀ)
(MAX7439)
Bypass
No boost
Boost 1
Boost 2
Boost 3
Boost 4
Open
15
0
1
0
Bypass
0
Bypass
0
0.318
0.758
1.53
11.3
16.5
11.3
4.42
2
0.5
0.75
1.5
7.32
11.3
18.2
1.0
2.5
1.5
2.25
3.0
4.027
2.0
The autotrimming circuit digitally controls the corner fre-
quency to maintain the frequency characteristics over
process and temperature.
Detailed Description
Filter
Filter Response
High-Frequency Boost
The high-frequency boost compensates for signal
degradation and roll-off in the signal path prior to the
MAX7438/MAX7439 to increase image sharpness.
Program the level of high-frequency boost for each
channel by selecting the corresponding external resis-
The MAX7438/MAX7439 reconstruction filters consist of
three separate lowpass filters with Butterworth-type
response. The filter features a maximally flat passband
for NTSC and PAL bandwidths, while maintaining good
group delay characteristics. The stopband offers excel-
lent attenuation at frequencies of 27MHz and above
(see the Typical Operating Characteristics section).
tor values (R
and R
, as shown in the
HFB_-2
HFB_-1
Typical Operating Circuit section) given in Table 1. The
6
_______________________________________________________________________________________
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
ACTIVE VIDEO
BACK
PORCH
FRONT
PORCH
BLACK LEVEL (SETUP)
BLANK LEVEL
COLOR BURST
H-SYNC TIP
Figure 1. Standard Video Signal
external resistors form a voltage-divider between V
system that provides the appropriate DC-level shift in
the filter channel to clamp the output to ground. The
back-porch clamp to ground eliminates the need for
large output-coupling capacitors that can introduce
unwanted line-time distortion (tilt), cost, and board
space. This feedback network and the on-chip capaci-
tors introduce a finite settling time (50 lines max) after
power-up or any dramatic shift in input voltage (see the
Electrical Characteristics section).
CC
(V))
and GND. The values in the fourth column (V
are calculated using the following equation:
HFB_
V
HFB_
= V
x R
/ (R
+ R
)
CC
HFB_-2
HFB_-1
HFB_-2
where V
= 5V.
CC
Apply an external voltage to HFB_ in place of R
HFB_-1
and R
as an alternative. See the Electrical
HFB_-2
Characteristics section. Filter boost modes can also be
controlled from a microprocessor. See the Applications
Information section.
Channel 1 requires a video signal with sync information
(CVBS, Y, or G), since the other two channels are
clamped from channel 1. In the absence of a sync on
channel 1, the circuit forces all outputs actively and
continuously to ground.
Filter Bypass
The MAX7438/MAX7439 offer selectable filter bypass-
ing that allows any of the video inputs to be filtered or
unfiltered. Select the filter bypass mode for a given
channel by setting the corresponding values for
Applications Information
R
and R
according to Table 1.
Power-Supply Bypassing and Layout
HFB_-1
HFB_-2
The MAX7438/MAX7439 operate from dual 5V sup-
Output Buffer
The output buffer is able to drive two standard 150
video loads with a 2V signal. The MAX7438 output
plies. Bypass V
and V to GND with 0.1µF capaci-
SS
CC
tors in parallel with 1µF capacitors. Place the 0.1µF
capacitors as close to the power inputs as possible.
P-P
buffer has a preset gain of 2V/V, and the MAX7439 out-
put buffer has a gain of 3V/V. The MAX7439 is ideal for
a DAC output whose voltage range is between 0.67V
and 1V. Set the DAC output to 0.67V to achieve a 2V/V
signal on OUT_.
Since EXT is a sensitive input, place R
close to the
EXT
device to avoid signals coupling into EXT. Do not route
any input, output, or dynamic signal near this pin and
the accompanying trace.
Note: The exposed paddle is electrically connected to
VSS.
Back-Porch Clamp
The MAX7438/MAX7439 feature a back-porch clamp to
set the output blanking level. This clamp shifts the DC
level of the video signal so that the back-porch level is
close to ground (see Figure 1). The devices sense the
voltage during back porch and feed back into a control
Do not connect the exposed paddle to ground. Refer to
the MAX7438 EV kit for layout examples, as well as a
proven PC board layout example.
_______________________________________________________________________________________
7
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
Typical Operating Circuit
ENCODER
DAC3
V
CC
R
T
R
R
HFB2-1
HFB2-2
DAC2
DAC1
R
T
10k
V
CC
EXT IN2
HFB2 IN3
R
R
HFB3-1
HFB3-2
R
T
HFB3
IN1
V
CC
R
R
HFB1-1
HFB1-2
MAX7438
MAX7439
HFB1
Z = 75
OUT3
GND
0
75
75
Z = 75
0
75
75
8
Z = 75
0
OUT1
V
75
V
OUT2
75
CC
SS
Z = 75
0
75
75
1 F
0.1 F
0.1 F
1 F
V
= +5V
V
SS
= -5V
CC
Z = 75
0
75
75
Z = 75
0
75
75
Microprocessor Control of High-Frequency
Boost and Bypass
Use a DAC output to control the bypass and high-fre-
quency boost levels on each channel (see Figure 2).
Set the DAC output voltage to the corresponding
bypass or boost levels desired (see Table 1).
MAX7438
MAX7439
HFB_
DAC
Figure 2. DAC Control of High-Frequency Boost and Bypass
_______________________________________________________________________________________
ꢀ
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
Pin Configuration
Chip Information
TRANSISTOR COUNT: 6418
TOP VIEW
PROCESS: BiCMOS
GND
IN1
1
2
3
4
5
15 GND
14 HFB3
MAX7438
MAX7439
13 GND
12 OUT3
HFB1
GND
OUT1
*CONNECT EXPOSED
PADDLE TO V
SS
11
GND
5mm ✕ 5mm THIN QFN
_______________________________________________________________________________________
9
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
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.)
D2
0.15
C A
D
b
0.10 M
C A B
C
L
D2/2
D/2
k
PIN # 1
I.D.
0.15
C
B
PIN # 1 I.D.
0.35x45
E/2
E2/2
C
(NE-1) X
e
L
E2
E
k
L
DETAIL A
e
(ND-1) X
e
C
C
L
L
L
L
e
e
0.10
C
A
0.08
C
C
A3
A1
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0140
C
2
COMMON DIMENSIONS
EXPOSED PAD VARIATIONS
NOTES:
1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
3. N IS THE TOTAL NUMBER OF TERMINALS.
4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1
SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE
ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.
5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm
FROM TERMINAL TIP.
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.
9. DRAWING CONFORMS TO JEDEC MO220.
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE
10. WARPAGE SHALL NOT EXCEED 0.10 mm.
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
APPROVAL
DOCUMENT CONTROL NO.
REV.
2
21-0140
C
2
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