Maxim MAX9512 Video filter amplifier with smartsleep and y/c mixer circuit Datasheet

19-0535; Rev 2; 2/09
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
The MAX9512 video filter amplifier with SmartSleep and
Y/C mixer is ideal for portable media players (PMPs),
portable DVD players, and set-top boxes (STBs). The
inputs can be directly connected to the digital-to-analog
converter (DAC) outputs. The dual reconstruction filters
remove high-frequency signals above 6.75MHz. The
Y/C-to-CVBS mixer creates a composite video signal
from luma and chroma. The four amplifiers each have
6dB of gain. The outputs can be DC-coupled to a load of
75Ω, which is equivalent to two video loads, or AC-coupled to a load of 150Ω.
The SmartSleep circuitry intelligently reduces power
consumption based on the presence of the input signal
and the output loads. When the MAX9512 does not
detect the presence of sync on luma, the supply current is reduced to less than 7µA. The device only
enables a video amplifier when there is an active video
input signal and an attached load. The video amplifier
remains on while a load is connected. If the load is disconnected, the video amplifier is turned off.
The MAX9512 operates from a 2.7V to 3.6V single supply and is offered in a small, 16-pin TQFN (3mm x
3mm) package. The device is specified over the -40°C
to +125°C automotive temperature range.
Applications
Portable Media Players
(PMPs)
Features
♦ SmartSleep Feature Detects Input Signal and
Output Load Status to Reduce Power
Consumption
♦ Dual Standard-Definition Video Reconstruction
Filters with 6.75MHz Passband
♦ Luma and Chroma Inputs
♦ Y/C-to-CVBS Mixer
♦ Luma, Chroma, and Two Composite Outputs
♦ Supports Two Video Loads at Each Output
(DC-Coupled)
♦ 2.7V to 3.6V Single-Supply Operation
Ordering Information
PART
MAX9512ATE+
PIN-PACKAGE
TOP MARK
16 TQFN-EP*
(3mm x 3mm)
AEN
Note: All devices specified over the -40°C to +125°C operating
temperature range.
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Set-Top Boxes (STBs)
Portable Applications
Block Diagrams
Portable DVD Players
LOAD SENSE
Pin Configuration
BUFFER
COUT
YOUT
CVBSOUT1
CVBSOUT2
CIN
12
11
10
9
TOP VIEW
VDD 13
N.C. 14
MAX9512
SMARTSLEEP 15
LOAD SENSE
YIN
8
GND
7
N.C.
6
SHDN
5
+
COUT
6dB
BUFFER
SMARTSLEEP
SHDN
CIN 16
LPF
N.C.
LPF
LOAD SENSE
ACTIVE VIDEO
DETECT
CONTROL
LOGIC
YOUT
6dB
CVBSOUT1
6dB
2
3
4
VDD
YIN
GND
N.C.
LOAD SENSE
1
THIN QFN
(3mm x 3mm)
MAX9512
6dB
CVBSOUT2
Block Diagrams continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
MAX9512
General Description
MAX9512
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND)
VDD ...........................................................................-0.3V to +4V
CIN, YIN, SMARTSLEEP, SHDN...............................-0.3V to +4V
Duration of COUT, YOUT, CVBSOUT1, CVBSOUT2
Short Circuit to VDD or GND....................................Continuous
Continuous Input Current
CIN, YIN, SMARTSLEEP, SHDN ....................................±20mA
Continuous Power Dissipation (TA = +70°C)
16-Pin TQFN-EP (derate 15.6mW/°C above +70°C)...1250mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°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
(VDD = VSHDN = 3.3V, VSMARTSLEEP = GND = 0V. RL = No load. TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
Supply Voltage Range
Supply Current
VDD
IDD
CONDITIONS
Guaranteed by PSRR
MIN
TYP
2.7
MAX
UNITS
3.6
V
mA
YIN = 0.3V, CIN = 0.6V
13
16
SMARTSLEEP = VDD, YIN has no active
video signal
7
14
µA
SMARTSLEEP = VDD, YIN has a black-burst
video signal with sync tip at GND (Note 2)
Shutdown Supply Current
ISHDN
17
VSHDN = GND
0.01
10
µA
5.2
% VDD
200
Ω
SMARTSLEEP CHARACTERISTICS
Minimum Line Frequency
YIN
14.3
Sync Slice Level
YIN
4.1
Output Load Detect Threshold
RL to GND, sync pulse present
kHz
DC CHARACTERISTICS
Input-Voltage Range
VIN
CIN, YIN,
guaranteed by
output voltage
swing
2.7V < VDD < 3.6V
0
1.05
3.0V < VDD < 3.6V
0
1.2
V
Input Current
IIN
CIN = YIN = 0V
2
Input Resistance
RIN
CIN, YIN
20
DC Voltage Gain
2
AV
RL = 150Ω to
VDD / 2
TA = -40°C to
0V ≤ VIN ≤ +85°C
1.05V, VDD
TA = -40°C to
= 2.7V
+125°C
0V ≤ VIN ≤
1.2V, VDD
= 3.0V
5.7
6
5.6
5
µA
MΩ
6.3
6.3
dB
TA = -40°C to
+85°C
5.7
TA = -40°C to
+125°C
5.6
6
_______________________________________________________________________________________
6.3
6.3
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
(VDD = VSHDN = 3.3V, VSMARTSLEEP = GND = 0V. RL = No load. TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
0V ≤ VIN ≤ 1.05V, VDD = 2.7V
-0.2
0
+0.2
0V ≤ VIN ≤ 1.2V, VDD = 3.0V
-0.2
0
+0.2
0.188
0.3
0.400
TA = -40°C to
+85°C
2.027
2.1
2.163
TA = -40°C to
+125°C
2.006
DC Gain Matching
UNITS
dB
Output Level
CIN = YIN = 0V, RL = 150Ω to GND
Measured at output, VDD
= 2.7V, 0V ≤ VIN ≤ 1.05V,
RL = 150Ω to -0.2V
Measured at output,
VDD = 2.7V, 0V ≤ VIN ≤ 1.05V,
RL = 150Ω to VDD / 2
Output Voltage Swing
Measured at output, VDD
= 3V, 0V ≤ VIN ≤ 1.2V, RL
= 150Ω to -0.2V
2.163
2.027
2.1
2.163
TA = -40°C to
+85°C
2.316
2.4
2.472
TA = -40°C to
+125°C
2.292
2.316
2.4
2.472
Measured at output, VDD = 3.135V,
0V ≤ VIN ≤ 1.05V, RL = 75Ω to -0.2V
2.027
2.1
2.163
ROUT
VOUT = 1.3V, -5mA ≤ ILOAD ≤ +5mA
Power-Supply Rejection Ratio
PSRR
2.7V ≤ VDD ≤ 3.6V, input referred,
RL = 150Ω to GND
Ω
0.47
48
Output Shutdown Impedance
VP-P
2.472
Measured at output, VDD = 3V,
0V ≤ VIN ≤ 1.2V, RL = 150Ω to VDD / 2
Output Resistance
V
dB
28
kΩ
LOGIC INPUTS (SMARTSLEEP, SHDN)
Logic-Low Threshold
Logic-High Threshold
Logic Input Current
VIL
0.3 x VDD
VIH
IIL/IIH
0.7 x VDD
VI = 0V or VDD
V
V
0.01
10
µA
_______________________________________________________________________________________
3
MAX9512
ELECTRICAL CHARACTERISTICS (continued)
MAX9512
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
AC CHARACTERISTICS
(VDD = VSHDN = +3.3V, VSMARTSLEEP = GND = 0V, RL = 150Ω to GND. TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
Color Subcarrier Output Voltage
Swing
CONDITIONS
MIN
VDD = 2.7V, YIN = 0.65V, CIN = 0.7VP-P
1.4
VDD = 3.0V, YIN = 0.75V, CIN = 0.9VP-P
1.8
300
f = 5.5MHz
Inputs are 1VP-P,
Reference frequency is
1MHz
Standard-Definition
Reconstruction Filter
f = 6.75MHz
-0.3
kHz
+1
dB
-3
-33
-41
f = 3.58MHz or
4.43MHz
AC-coupled output, 5-step
modulated staircase
f = 3.58MHz or
4.43MHz
0.4
f = 3.58MHz
0.62
f = 4.43MHz
0.75
f = 3.58MHz
0.78
f = 4.43MHz
1.01
0.2
DG
%
DP
degrees
AC-coupled output, 5-step
modulated staircase
4
-1
DC-coupled output, 5-step
modulated staircase
DC-coupled output, 5-step
modulated staircase
2T Pulse Response
UNITS
-0.1
f = 11MHz
f = 27MHz
Differential Phase
MAX
VP-P
Mixer HPF -3dB Frequency
Differential Gain
TYP
2T = 200ns or 250ns
0.2
_______________________________________________________________________________________
K%
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
(VDD = VSHDN = +3.3V, VSMARTSLEEP = GND = 0V, RL = 150Ω to GND. TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2T Bar Response
Bar time is 18µs, the beginning 2.5% and
the ending 2.5% of the bar time are ignored,
2T = 200ns or 250ns
0.2
K%
2T Pulse-to-Bar K Rating
Bar time is 18µs, the beginning 2.5% and
the ending 2.5% of the bar time are ignored,
2T = 200ns or 250ns
0.3
K%
Nonlinearity
5-step staircase
0.1
%
Interchannel Timing Error
Difference in time between the 50% point of
the output signals, YOUT to COUT
0.2
ns
Group Delay Distortion
100kHz ≤ f ≤ 5MHz, inputs are 1VP-P
10
ns
Interchannel Group Delay
Distortion Error
Outputs are 2VP-P
2
ns
Peak Signal to RMS Noise
100kHz ≤ f ≤ 5MHz, inputs are 1VP-P
67
dB
Power-Supply Rejection Ratio
f = 100kHz, 200mVP-P, input referred
43
dB
Output Impedance
f = 5MHz
6
Ω
Enable Time
YIN = 1V, output settled to within 1% of the
final voltage, RL = 150Ω to GND
13
µs
Disable Time
YIN = 1V, output settled to within 1% of the
final voltage, RL = 150Ω to GND
1.1
µs
All Hostile Output Crosstalk
f = 4.43MHz
-71
dB
All Hostile Input Crosstalk
f = 4.43MHz, SHDN = GND,
input termination resistors are 75Ω
-106
dB
CROSSTALK
Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design.
Note 2: Specified current is an average over time.
_______________________________________________________________________________________
5
MAX9512
AC CHARACTERISTICS (continued)
Typical Operating Characteristics
(VDD = V SHDN = +3.3V, VSMARTSLEEP = GND = 0V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.)
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
-10
-20
-30
-40
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-50
-1.0
100k
1M
10M
-20
-30
-40
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
GROUP DELAY
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0.6
VOUT = 2VP-P
0
125
-10
-20
DELAY (ns)
0.2
0
-0.2
PSRR (dB)
100
0.4
MAX9512 toc06
VOUT = 2VP-P
NORMALIZED TO 1MHz
MAX9512 toc05
150
MAX9512 toc04
1.0
75
50
-30
-40
-50
-0.4
25
-60
-0.6
-0.8
-1.0
100k
1M
-70
-25
-80
1M
100k
100M
10M
0
10M
100M
10k
13.0
12.5
12.0
11.5
MAX9512 toc08
2.02
2.01
VOLTAGE GAIN (V/V)
13.5
10M
VOLTAGE GAIN
vs. TEMPERATURE
MAX9512 toc07
14.0
1M
FREQUENCY (Hz)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT (mA)
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
2.00
1.99
1.98
1.97
1.96
1.95
11.0
-50
-25
0
25
50
75
TEMPERATURE (°C)
6
-10
-60
1M
100k
100M
0
-50
-0.8
-60
VOUT = 2VP-P
NORMALIZED TO 1MHz
10
OUTPUT AMPLITUDE (dB)
0
0.8
VOUT = 100mVP-P
NORMALIZED TO 1MHz
0.8
20
MAX9512 toc02
VOUT = 100mVP-P
NORMALIZED TO 1MHz
OUTPUT AMPLITUDE (dB)
OUTPUT AMPLITUDE (dB)
10
1.0
MAX9512 toc01
20
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX9512 toc03
SMALL-SIGNAL GAIN
vs. FREQUENCY
OUTPUT AMPLITUDE (dB)
MAX9512
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
100
125
-50
-25
0
25
50
75
100
TEMPERATURE (°C)
_______________________________________________________________________________________
125
100M
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
2.5
2.0
1.5
DIFFERENTIAL PHASE
(DEG)
OUTPUT VOLTAGE (V)
3.0
1.0
0.5
0
MAX9512 toc11
MAX9512 toc10
YIN, CIN
INPUTS ONLY
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
DIFFERENTIAL GAIN
(%)
3.5
2T RESPONSE
DIFFERENTIAL GAIN AND PHASE
MAX9512 toc09
4.0
VIN
200mV/div
1
2
3
4
5
6
7
0.8
0.4
VOUT
400mV/div
0
-0.4
-0.5
-0.8
-0.5
0
0.5
1.0
1.5
2.0
INPUT VOLTAGE (V)
4
STEP
12.5T RESPONSE
NTC-7 VIDEO TEST SIGNAL GENERATED
FROM LUMA AND CHROMA INPUTS
1
2
3
5
6
100ns/div
7
PAL MULTIBURST RESPONSE
MAX9512 toc13
MAX9512 toc12
MAX9512 toc14
YIN
500mV/div
YIN
200mV/div
CVBSIN
500mV/div
CIN
500mV/div
CVBSOUT1
1V/div
CVBOUT1
1V/div
YOUT
400mV/div
10μs/div
400ns/div
10μs/div
FIELD SQUARE-WAVE RESPONSE
PAL COLOR BARS
MAX9512 toc16
MAX9512 toc15
CVBSIN
500mV/div
CVBSIN
500mV/div
CVBSOUT1
1V/div
10μs/div
CVBSOUT1
1V/div
2ms/div
_______________________________________________________________________________________
7
MAX9512
Typical Operating Characteristics (continued)
(VDD = V SHDN = +3.3V, VSMARTSLEEP = GND = 0V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VDD = V SHDN = +3.3V, VSMARTSLEEP = GND = 0V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.)
ENABLE TIME
FREQUENCY RESPONSE
AT 6.75MHz DISTRIBUTION
DISABLE TIME
MAX9512 toc17
MAX9512 toc19
MAX9512 toc18
INPUT VOLTAGE = 1V
INPUT VOLTAGE = 1V
OUTPUT
1V/div
SHDN
1V/div
SHDN
1V/div
PROBABILITY
OUTPUT
1V/div
2μs/div
-0.6
200ns/div
-0.5
-0.4
-0.3
-0.2
ATTENUATION (dB)
INPUT-TO-INPUT CROSSTALK
vs. FREQUENCY
FREQUENCY RESPONSE
AT 27MHz DISTRIBUTION
-20
CROSSTALK (dB)
PROBABILITY
MAX9512 toc21
MAX9512 toc20
0
-40
-60
-80
-100
-120
-52 -50 -48 -46 -44 -42 -40 -38 -36 -34 -32
100k
1M
10M
ATTENUATION (dB)
FREQUENCY (Hz)
OUTPUT-TO-OUTPUT CROSSTALK
vs. FREQUENCY
OUTPUT IMPEDANCE
vs. FREQUENCY
OUTPUT IMPEDANCE (Ω)
-20
-40
-60
-80
100M
MAX9512 toc23
100
MAX9512 toc22
0
CROSSTALK (dB)
MAX9512
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
10
1
-100
-120
0.1
100k
1M
10M
FREQUENCY (Hz)
8
100M
100k
1M
10M
FREQUENCY (Hz)
_______________________________________________________________________________________
100M
-0.1
0
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
PIN
NAME
TQFN-EP
1, 13
VDD
FUNCTION
Power Supply. Bypass with a 0.1µF capacitor to GND.
2
YIN
3, 8
GND
Ground
Luma Video Input. Directly connect this input to the video DAC output.
4, 5, 7, 14
N.C.
No Connection. Connect to GND.
6
SHDN
9
CVBSOUT2
CVBS Output 2
10
CVBSOUT1
CVBS Output 1
11
YOUT
Luma Video Output
12
COUT
Chroma Video Output
15
SMARTSLEEP
16
CIN
Chroma Video Input. Directly connect this input to the video DAC output.
—
EP
Exposed Pad. Connect EP to GND. EP is also internally connected to GND.
Active-Low Shutdown Logic Input. Connect to logic low to place device in shutdown. Connect to
logic high for normal operation.
SmartSleep Logic Input. Connect to logic high to activate SmartSleep operation.
+3.3V
0.1μF
VDD
VIDEO ENCODER
LOAD SENSE
BUFFER
CIN
CURRENT
DAC
75Ω
CHROMA
LOAD SENSE
BUFFER
YIN
CURRENT
DAC
COUT
6dB
LPF
YOUT
6dB
LPF
LUMA
LOAD SENSE
MAX9512
ACTIVE VIDEO
DETECT
75Ω
CVBSOUT1
6dB
75Ω
CVBS1
SMARTSLEEP
+3.3V
SHDN
CONTROL
LOGIC
LOAD SENSE
6dB
CVBSOUT2
75Ω
CVBS2
GND
Figure 1. Typical Application Circuit for Portable Media Players
_______________________________________________________________________________________
9
MAX9512
Pin Description
MAX9512
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
Detailed Description
loads attached to the outputs. If the SmartSleep feature
is not activated and the part is not in shutdown, the filters
and output amplifiers completely turn on, regardless of
whether there is a video signal at the YIN input and
whether there are loads connected at the outputs.
SmartSleep only works with DC-coupled loads.
In the Typical Application Circuit (Figure 1), the current
DACs on a video encoder generate luma and chroma
video signals. The MAX9512 filters those signals and
then adds them together to create the composite video
signal. The output amplifiers drive the video connectors
through a 75Ω back termination resistor.
Standby Mode
In standby mode, the filters and output amplifiers are
off and only the active video detect circuit is operational. Quiescent current consumption is approximately
7µA (Figure 2). The active video detect circuit checks if
sync is present on the YIN signal. If no sync is detected
the device remains in standby mode.
SmartSleep Feature
The SmartSleep feature is activated when the
SMARTSLEEP input is connected to logic high. The
SmartSleep feature provides intelligent power management by selectively disabling the filters and output amplifiers based on the presence of a luma video signal or
+3.3V
7μA
NO VIDEO
SIGNAL
VDD
VIDEO ENCODER
LOAD SENSE
BUFFER
OFF
CIN
CURRENT
DAC
6dB
LPF
OFF
COUT
75Ω
CHROMA
OFF
OFF
OFF
LOAD SENSE
BUFFER
OFF
YIN
CURRENT
DAC
6dB
LPF
OFF
YOUT
75Ω
LUMA
OFF
OFF
LOAD SENSE
OFF
6dB
ACTIVE VIDEO
DETECT
CVBSOUT1
75Ω
CVBS1
OFF
SMARTSLEEP
+3.3V
SHDN
CONTROL
LOGIC
LOAD SENSE
OFF
6dB
CVBSOUT2
75Ω
OFF
MAX9512
GND
Figure 2. Standby Mode Operation
10
______________________________________________________________________________________
CVBS2
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
based on the input signal presence and output loading.
Figures 4 and 5 show which portions of the MAX9512
turn on and which remain off with different load configurations. In Figure 4, both filters and the Y/C mixer turn
on to generate the composite video signal for the amplifier connected to CVBSOUT1. In Figure 5, only the luma
filter turns on, and the Y/C mixer stays off.
When an amplifier is on, it continually checks if the load
has been disconnected by detecting if the amplifier
output is sourcing current during a horizontal line time.
If no sourcing current is detected within one horizontal
line time (approximately 64µs), the load has been disconnected and the amplifier returns to active-detect
mode. If, at any time, the input video signal is removed,
the MAX9512 returns to standby mode.
If the SmartSleep feature is not activated and the part is
not in shutdown, then the filters and amplifiers completely turn on, regardless of whether there is a video
signal at the CVBSIN input and whether there are loads
connected at the outputs.
Full-Operation Mode
If a load is connected to an output, the corresponding
filter and amplifier turn on and remain on until the output load is disconnected. In full-operation mode,
SmartSleep intelligently reduces the supply current
+3.3V
0
TO
50mV
17μA
VDD
VIDEO SIGNAL
PRESENT
VIDEO ENCODER
LOAD SENSE
BUFFER
CIN
CURRENT
DAC
LPF
OFF
OFF
YOUT
6dB
LPF
OFF
CHROMA
LOAD SENSE
YIN
CURRENT
DAC
75Ω
OFF
OFF
BUFFER
COUT
6dB
75Ω
LUMA
NO
LOADS
OFF
OFF
LOAD SENSE
ACTIVE VIDEO
DETECT
SMARTSLEEP
+3.3V
CVBSOUT1
6dB
75Ω
CVBS1
OFF
CONTROL
LOGIC
SHDN
LOAD SENSE
6dB
CVBSOUT2
75Ω
CVBS2
OFF
MAX9512
GND
Figure 3. Active-Detect Mode with No Output Loads
______________________________________________________________________________________
11
MAX9512
Active-Detect Mode
The active video detect circuit slices the YIN signal at
4.7% of the power supply (155mV for a 3.3V supply). If
the transitions occur at a rate of 14.3kHz or higher,
then a video signal is present. When the MAX9512
detects a video signal with sync at the YIN input, the
control logic enters the active-detect mode and
enables the load sense circuitry (Figure 3). The supply
current is typically 17µA.
If an output load is not connected to any amplifier, the
MAX9512 remains in active-detect mode. Eight times per
second, each load-sense circuit checks for a load by
connecting an internal 15kΩ pullup resistor to the output
for 1ms. If the output is pulled up, then no load is present. If the output stays low, a load is connected.
MAX9512
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
0
TO
50mV
+3.3V
5mA QUIESCENT
SUPPLY CURRENT
PLUS
OUTPUT LOAD CURRENT
VDD
VIDEO SIGNAL
PRESENT
VIDEO ENCODER
LOAD SENSE
BUFFER
CIN
CURRENT
DAC
COUT
6dB
LPF
75Ω
CHROMA
OFF
LOAD SENSE
BUFFER
YIN
CURRENT
DAC
YOUT
6dB
LPF
75Ω
LUMA
OFF
LOAD SENSE
ACTIVE VIDEO
DETECT
CVBSOUT1
6dB
75Ω
CVBS1
SMARTSLEEP
+3.3V
SHDN
CONTROL
LOGIC
75Ω
LOAD SENSE
6dB
CVBSOUT2
75Ω
MAX9512
OFF
GND
Figure 4. Full Operation Mode with CVBSOUT1 Loaded
12
______________________________________________________________________________________
CVBS 2
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
MAX9512
0
TO
50mV
+3.3V
2.9mA QUIESCENT
SUPPLY CURRENT
PLUS
OUTPUT LOAD CURRENT
VDD
VIDEO SIGNAL
PRESENT
VIDEO ENCODER
LOAD SENSE
BUFFER
CIN
CURRENT
DAC
LPF
OFF
75Ω
CHROMA
OFF
OFF
OFF
LOAD SENSE
BUFFER
YIN
CURRENT
DAC
COUT
6dB
YOUT
6dB
LPF
75Ω
LUMA
75Ω
LOAD SENSE
ACTIVE VIDEO
DETECT
CVBSOUT1
6dB
75Ω
CVBS1
SMARTSLEEP
+3.3V
OFF
CONTROL
LOGIC
SHDN
LOAD SENSE
6dB
CVBSOUT2
75Ω
CVBS2
MAX9512
OFF
GND
Figure 5. Full Operation Mode with YOUT Loaded
______________________________________________________________________________________
13
MAX9512
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
Inputs
The MAX9512 video inputs YIN and CIN should be
directly connected to the output of the video current
DAC. DC-coupling ensures that the input signals are
ground referenced such that the sync tip of the luma
signal is within 50mV of ground and the blank level of
the chroma signal is between 0.5V and 0.65V.
Video Reconstruction Filter
The MAX9512 filter passband is 6.75MHz, which makes
the device suitable for the higher bandwidth video signals from a DVD chip. Broadcast video signals actually
require less bandwidth because of channel limitations:
NTSC signals have 4.2MHz bandwidth, and PAL signals
have 5MHz bandwidth. Video signals from a DVD player
are not channel limited; therefore, the bandwidth of DVD
video signals can push right against the Nyquist limit of
6.75MHz. (Recommendation ITU-R BT.601-5 specifies
13.5MHz as the sampling rate for standard-definition
video). Therefore, the maximum bandwidth of the signal
is 6.75MHz. To ease the filtering requirements, most
modern video systems oversample by two times, clocking the video current DAC at 27MHz.
Y/C Mixer
The Y/C mixer adds the luma and chroma signals
together to create a composite video signal. Since
chroma is a phase modulated carrier at 3.58MHz for
NTSC and 4.43MHz for PAL, the chroma signal is ACcoupled into the Y/C mixer so that the variation in blank
level from one video source to another video source
does not affect the DC bias of the composite video signal. The highpass corner frequency of the chroma ACcoupling circuit is 300kHz.
Outputs
The video output amplifiers can both source and sink
load current, allowing output loads to be DC- or ACcoupled. The amplifier output stage needs about
300mV of headroom from either supply rail. The
MAX9512 has an internal level shift circuit that positions
the sync tip at approximately 300mV at the output. The
14
blank level of the chroma output is positioned at
approximately 1.3V if the blank level of the chroma
input signal is 0.5V. The blank level of the chroma output is positioned at approximately 1.5V if the blank level
of the chroma input signal is 0.6V.
If the supply voltage is greater than 3.135V (5% below
a 3.3V supply), each amplifier can drive two DC-coupled video loads to ground. If the supply is less than
3.135V, each amplifier can drive only one DC-coupled
or AC-coupled video load.
Shutdown
When SHDN is low, the MAX9512 draws less than 1µA
supply current. All the amplifier outputs become high
impedance. The effective output resistance at the video
outputs is 28kΩ, due to the internal feedback resistors
to ground.
Applications Information
Reducing Power Consumption in
the Video DACs
YIN and CIN have high-impedance input buffers and
can work with source resistances as high as 300Ω. To
reduce power dissipation in the video DACs, the DAC
output resistor can be scaled up in value. The reference resistor that sets the reference current inside the
video DACs must also be similarly scaled up. For
instance, if the output resistor is 37.5Ω, the DAC must
source 26.7mA when the output is 1V. If the output
resistor is increased to 300Ω, the DAC only needs to
source 3.33mA when the output is 1V.
There is parasitic capacitance from the DAC output to
ground. That capacitance in parallel with the DAC output resistor forms a pole that can potentially roll off the
frequency response of the video signal. For example,
300Ω in parallel with 50pF creates a pole at 10.6MHz.
To minimize this capacitance, reduce the area of the
signal trace attached to the DAC output as much as
possible, and place the MAX9512 as close to the video
DAC outputs as possible.
______________________________________________________________________________________
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
Power-Supply Bypassing and Ground
The MAX9512 operates from a single-supply voltage
down to 2.7V, allowing for low-power operation. Bypass
VDD to GND with a 0.1µF capacitor. Place all external
components as close to the device as possible.
+3.3V
0.1μF
VDD
VIDEO ENCODER
LOAD SENSE
BUFFER
CIN
CURRENT
DAC
LPF
75Ω
YIN
YOUT
6dB
LPF
CHROMA
75Ω
ACTIVE VIDEO
DETECT
+3.3V
220μF
LUMA
LOAD SENSE
0V
220μF
LOAD SENSE
BUFFER
CURRENT
DAC
COUT
6dB
CVBSOUT1
6dB
75Ω
220μF
CVBS1
SMARTSLEEP
SHDN
CONTROL
LOGIC
LOAD SENSE
6dB
CVBSOUT2
75Ω
220μF
CVBS2
MAX9512
GND
Figure 6. AC-Coupling at the Outputs
______________________________________________________________________________________
15
MAX9512
AC-Coupling the Outputs
The outputs can be AC-coupled since the output stage
can source and sink current as shown in Figure 6.
Coupling capacitors should be 220µF or greater to keep
the highpass filter formed by the 150Ω equivalent resistance of the video transmission line to a corner frequency of 4.8Hz or below. The frame rate of PAL systems is
25Hz, and the frame rate of NTSC systems is 30Hz. The
corner frequency should be well below the frame rate.
Smartsleep only works with DC-coupled loads.
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
MAX9512
Block Diagrams (continued)
LOAD SENSE
BUFFER
CIN
LPF
0
TO
50mV
COUT
6dB
LOAD SENSE
BUFFER
YIN
LPF
YOUT
6dB
ACTIVE VIDEO
DETECT
300mV
TO
400mV
LOAD SENSE
SMARTSLEEP
SHDN
CONTROL
LOGIC
CVBSOUT1
6dB
LOAD SENSE
MAX9512
6dB
CVBSOUT2
Chip Information
PROCESS: BiCMOS
16
______________________________________________________________________________________
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
PACKAGE CODE
DOCUMENT NO.
16 TQFN-EP
T1633-4
21-0136
(NE - 1) X e
E
MARKING
12x16L QFN THIN.EPS
PACKAGE TYPE
E/2
D2/2
(ND - 1) X e
D/2
AAAA
e
CL
D
D2
k
CL
b
0.10 M C A B
E2/2
L
E2
0.10 C
C
L
C
L
0.08 C
A
A2
A1
L
L
e
e
PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
I
1
2
______________________________________________________________________________________
17
MAX9512
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9512
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PKG
8L 3x3
12L 3x3
16L 3x3
REF.
MIN. NOM. MAX.
MIN. NOM. MAX.
MIN. NOM. MAX.
A
0.70
0.75
0.80
0.70
0.75
0.80
0.70
0.75
0.80
b
0.25
0.30
0.35
0.20
0.25
0.30
0.20
0.25
0.30
D
2.90
3.00
3.10
2.90
3.00
3.10
2.90
3.00
3.10
E
2.90
3.00
3.10
2.90
3.00
3.10
2.90
3.00
3.10
e
L
0.65 BSC.
0.35
0.55
0.50 BSC.
0.75
0.45
0.55
0.50 BSC.
0.65
0.30
0.40
N
8
12
16
ND
2
3
4
NE
2
3
4
0
A1
A2
k
0.02
0.05
0
0.25
-
0.02
0.05
0
-
0.25
-
0.02
0.50
0.05
0.20 REF
0.20 REF
0.20 REF
EXPOSED PAD VARIATIONS
-
0.25
-
PKG.
CODES
TQ833-1
E2
D2
PIN ID
JEDEC
MIN.
NOM.
MAX.
MIN.
NOM.
MAX.
0.25
0.70
1.25
0.25
0.70
1.25
0.35 x 45°
WEEC
WEED-1
T1233-1
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
T1233-3
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-1
T1233-4
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-1
T1633-2
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-2
T1633F-3
0.65
0.80
0.95
0.65
0.80
0.95
0.225 x 45°
WEED-2
T1633FH-3
0.65
0.80
0.95
0.65
0.80
0.95
0.225 x 45°
WEED-2
T1633-4
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-2
T1633-5
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-2
-
NOTES:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
N IS THE TOTAL NUMBER OF TERMINALS.
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.
DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm
FROM TERMINAL TIP.
ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS
.
DRAWING CONFORMS TO JEDEC MO220 REVISION C.
MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.
WARPAGE NOT TO EXCEED 0.10mm.
PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
18
______________________________________________________________________________________
I
2
2
Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
REVISION
NUMBER
REVISION
DATE
1
5/1/06
2
2/09
DESCRIPTION
Initial release
Removed QSOP package
PAGES
CHANGED
—
1, 2, 3, 16, 17, 18
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 ____________________ 19
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX9512
Revision History