MAXIM MAX9508 Technical data

General Description

The MAX9508 video filter amplifier with SmartSleep and
bidirectional video support is ideal for set-top boxes
(STBs), portable DVD players, and portable media
players (PMPs). The inputs can be directly connected
to the digital-to-analog converter (DAC) outputs. The
reconstruction filter removes high-frequency signals
above 6.75MHz. The amplifiers have 6dB of gain, and
the outputs can be DC-coupled to a load of 75Ω,
which is equivalent to two video loads, or it can be
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 MAX9508 does not
detect the presence of sync on the input video signal,
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 MAX9508 contains three reconstruction filters, four
video amplifiers, and a pulldown switch at one of the
two CVBS outputs. The MAX9508 has the ability to con­trol the bidirectional video signals at the CVBS video
connections without the need for separate switches or
relays. This feature is particularly useful for portable
DVD players, which often use the same connector to
drive a composite video output and to accept an exter­nal video signal to display on the LCD panel.

The MAX9508 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 DVD Players

Set-Top Boxes (STBs)

Portable Set-Top Boxes/
Personal Video Recorders (PVRs)

Portable Media Players (PMPs)

Portable Applications

Features

♦ SmartSleep Feature Detects Input Signal and

Output Load Status to Reduce Power
Consumption

♦ Triple Standard-Definition Video Reconstruction

Filters with 6.75MHz Passband

♦ Luma, Chroma, and Composite Inputs

♦ Luma, Chroma, and Two Composite Outputs

♦ Integrated Support for a Bidirectional Composite

Video Signal

♦ Supports Two Video Loads at Each Output

(DC-Coupled)

♦ 2.7V to 3.6V Single-Supply Operation

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-0531; Rev 2; 1/09

EVALUATION KIT

AVAILABLE

Block Diagrams

Note: Device is specified over the -40°C to +125°C operating
temperature range.

+

Denotes lead(Pb)-free/RoHS-compliant package.

*

EP = Exposed pad.

Pin Configurations appear at end of data sheet.

Block Diagrams continued at end of data sheet.

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.

PART PIN-PACKAGE TOP MARK

MAX9508ATE+

16 TQFN-EP*

(3mm x 3mm)

AEM

CIN

YIN

INT/EXT

SMARTSLEEP

SHDN

CVBSIN

BUFFER

BUFFER

ACTIVE VIDEO

CONTROL

LOGIC

DETECT

BUFFER

LPF

LPF

MAX9508

6dB

6dB

6dB

LOAD SENSE

COUT

LOAD SENSE

YOUT

LOAD SENSE

CVBSOUT1

LPF

LOAD SENSE

6dB

CVBSOUT2

EXTCVBSIN

CLAMP

MAX9508

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= V

SHDN

= 3.3V, V

SMARTSLEEP

= V

INT/EXT

= V

GND

= 0V, RL= No load. TA= T

MIN

to T

MAX

, unless otherwise noted. Typical val-

ues are at T

A

= +25°C.) (Note 1)

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.

(Voltages with respect to GND.)
V

DD ..........................................................................

-0.3V to +4V

SMARTSLEEP, SHDN, INT/EXT

CIN, YIN, CVBSIN, EXTCVBSIN ..........................-0.3V to +4V

Duration of COUT, YOUT, CVBSOUT1, CVBSOUT2

Short Circuit to VDDor GND ..................................Continuous

Continuous Input Current

CIN, YIN, EXTCVBSIN, CVBSIN,

SMARTSLEEP, SHDN, INT/EXT ....................................±20mA

Continuous Power Dissipation (TA= +70°C)

16-Pin TQFN (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

Supply Voltage Range V

Supply Current I

Shutdown Supply Current I

SMARTSLEEP CHARACTERISTICS

Minimum Line Frequency CVBSIN 14.3 kHz

Sync Slice Level CVBSIN 4.1 5.2 % V

Output Load Detect Threshold Sync pulse present, RL to GND 200 Ω

DC CHARACTERISTICS

Input-Voltage Range V

Input Current I

Input Resistance R

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DD

DD

SHDN

IN

IN

IN

Guaranteed by PSRR 2.7 3.6 V

INT/E X T = G N D ( 4 channel s acti ve) ,
YIN = CVBSIN = 0.3V, CIN = 0.6V

INT/EXT = VDD (1 channel active),
EXTCVBSIN is unconnected

SMARTSLEEP = V
CVBSIN has no active video signal

SMARTSLEEP = VDD, CVBSIN has a black­burst video signal with sync tip at GND
(Note 2)

V

= GND 0.01 10 µA

SHDN

C IN , Y IN , C V BS IN ,
g uar anteed b y outp ut
vol tag e sw i ng

CIN = YIN = CVBSIN = 0V 2 5 µA

CIN, YIN, CVBSIN 20 MΩ

DD,

2.7V < VDD < 3.6V 0 1.05

3.0V < V

< 3.6V 0 1.2

DD

13 16

4.3 6

714

17

mA

µA

DD

V

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= V

SHDN

= 3.3V, V

SMARTSLEEP

= V

INT/EXT

= V

GND

= 0V, RL= No load. TA= T

MIN

to T

MAX

, unless otherwise noted. Typical val-

ues are at T

A

= +25°C.) (Note 1)

Sync-Tip Clamp Level V

Inp ut C l am p i ng C ur r ent EXTCVBSIN = 500mV + V

EXTCVBSIN Input Voltage Range

Sync Crush

Maximum Input Source
Resistance

DC Voltage Gain A

DC Gain Matching

Output Level

Output Voltage Swing

Output Resistance R

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CLP

EXTCVBSIN 0.25 0.37 V

Guaranteed by

2.7V < VDD < 3.6V 1.05

output voltage
swing

3.0V < V

EXTCVBSIN, percentage reduction in sync
pulse (0.3V

), guaranteed by input

P-P

clamping current measurement, measured
at input

EXTCVBSIN 300 Ω

RL = 150Ω to VDD/2, 0V ≤ VIN ≤ 1.05V,

V

= 2.7V

V

DD

R

= 150Ω to VDD/2, 0V ≤ VIN ≤ 1.05V,

L

= 2.7V

V

DD

YIN = CVBSIN = CIN = 0V,
INT/EXT = GND, R

C

EXTCVBSIN

INT/EXT = V

= 150Ω to GND

L

= 0.1µF to GND,

= 150Ω to GND

DD, RL

Measured at output,
V

= 2.7V,

DD

0V ≤ V
R

≤ 1.05V,

IN

= 150Ω to -0.2V

L

Measured at output, VDD = 2.7V,
0V ≤ V

≤ 1.05V, RL = 150Ω to VDD / 2

IN

Measured at output,

= 3V,

V

DD

0V ≤ V
R

≤ 1.2V,

IN

= 150Ω to -0.2V

L

Measured at output, VDD = 3V,
0V ≤ V

≤ 1.2V, RL = 150Ω to VDD / 2

IN

Measured at output, V

≤ 1.05V, RL = 75Ω to -0.2V

IN

= 1.3V, -5mA ≤ I

OUT

OUT

0V ≤ V

V

CLP

< 3.6V 1.2

DD

0.5 1 1.5 µA

5.7 6 6.3 dB

-0.2 0 +0.2 dB

0.21 0.3 0.38

0.21 0.27 0.38

TA = -40°C to
+85°C

T

= -40°C to

A

+125°C

2.027 2.1 2.163

2.006 2.163

2.027 2.1 2.163

TA = -40°C to
+85°C

= -40°C to

T

A

+125°C

2.316 2.4 2.472

2.292 2.472

2.316 2.4 2.472

= 3.135V,

DD

≤ +5mA 0.47 Ω

LOAD

2.027 2.1 2.163

V

P-P

2%

V

V

P-P

MAX9508

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= V

SHDN

= 3.3V, V

SMARTSLEEP

= V

INT/EXT

= V

GND

= 0V, RL= No load. TA= T

MIN

to T

MAX

, unless otherwise noted. Typical val-

ues are at T

A

= +25°C.) (Note 1)

AC ELECTRICAL CHARACTERISTICS

(VDD= V

SHDN

= 3.3V, V

SMARTSLEEP

= V

INT/EXT

= V

GND

= 0V, RL= 150Ω to GND. TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

A

= +25°C.) (Note 1)

Power-Supply Rejection Ratio PSRR

Output Pulldown Resistance R

Output Shutdown Impedance 28 kΩ

LOGIC INPUTS (SMARTSLEEP, SHDN, INT/EXT)

Logic-Low Threshold V

Logic-High Threshold V

Logic Input Current IIL / I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Standard-Definition
Reconstruction Filter

Differential Gain DG

Differential Phase DP

2T Pulse Response 2T = 200ns or 250ns 0.2 K%

2T Bar Response

2T Pulse-to-Bar K
Rating

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Inputs are 1V
frequency is 1MHz.

DC-coupled output,
5-step modulated staircase

AC-coupled output,
5-step modulated staircase

DC-coupled output,
5-step modulated staircase

AC-coupled output,
5-step modulated staircase

Bar time is 18µs, the beginning 2.5% and the ending 2.5%
of the bar time are ignored, 2T = 200ns or 250ns

Bar time is 18µs, the beginning 2.5% and the ending 2.5%
of the bar time are ignored, 2T = 200ns or 250ns

PD

IL

IH

IH

2.7V ≤ V
R

= 150Ω to GND

L

INT/EXT = VDD, CVBSOUT1 3.7 Ω

VI = 0V or V

P-P

≤ 3.6V, input referred,

DD

DD

f = 5.5MHz -0.1

, reference

f = 6.75MHz -1 -0.3 +1

f = 11MHz -3

f = 27MHz -33 -41

f = 3.58MHz or

4.43MHz

f = 3.58MHz or

4.43MHz

f = 3.58MHz 0.62

f = 4.43MHz 0.75

f = 3.58MHz 0.78

f = 4.43MHz 1.01

48 dB

0.7 x
V

DD

0.01 10 µA

0.2

0.4

0.2 K%

0.3 K%

0.3 x
V

DD

V

V

dB

%

D eg r ees

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

_______________________________________________________________________________________ 5

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.

AC ELECTRICAL CHARACTERISTICS (continued)

(VDD= V

SHDN

= 3.3V, V

SMARTSLEEP

= V

INT/EXT

= V

GND

= 0V, RL= 150Ω to GND. TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Nonlinearity 5-step staircase 0.1 %

Interchannel Timing
Error

Group Delay
Distortion

Interchannel Group
Delay Distortion Error

Peak Signal to RMS
Noise

Power-Supply
Rejection Ratio

Output Impedance f = 5MHz 6 Ω

Enable Time

Disable Time

CROSSTALK

All Hostile Output
Crosstalk

All Hostile Input
Crosstalk

Difference in time between the 50% point of the output
signals, YOUT to COUT

100kHz ≤ f ≤ 5MHz, inputs are 1V

Inputs are 1V

100kHz ≤ f ≤ 5MHz, inputs are 1V

f = 100kHz, 200mV

YIN = 1V, output settled to within 1% of the final voltage,

= 150Ω to GND

R

L

YIN = 1V, output settled to within 1% of the final voltage,

= 150Ω to GND

R

L

f = 4.43MHz -70 dB

f = 4.43MHz, SHDN = GND,
input termination resistors are 75Ω

P-P

P-P

P-P

, input referred 43 dB

P-P

0.2 ns

10 ns

2ns

67 dB

13 µs

1.1 µs

-69 dB

MAX9508

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

6 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD= V

SHDN

= +3.3V, V

SMARTSLEEP

= V

INT/EXT

= V

GND

= 0V. RL = 150Ω to GND. TA= +25°C, unless otherwise noted.)

SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX9508 toc01

FREQUENCY (Hz)

OUTPUT AMPLITUDE (dB)

10M1M

-50

-40

-30

-20

-10

0

10

20

-60
100k 100M

V

OUT

= 100mV

P-P

NORMALIZED TO 1MHz

SMALL-SIGNAL GAIN FLATNESS

vs. FREQUENCY

MAX9508 toc02

FREQUENCY (Hz)

OUTPUT AMPLITUDE (dB)

1M 10M

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1.0

-1.0
100k 100M

V

OUT

= 100mV

P-P

NORMALIZED TO 1MHz

LARGE-SIGNAL GAIN

vs. FREQUENCY

MAX9508 toc03

FREQUENCY (Hz)

OUTPUT AMPLITUDE (dB)

10M1M

-50

-40

-30

-20

-10

0

10

20

-60
100k 100M

V

OUT

= 2V

P-P

NORMALIZED TO 1MHz

LARGE-SIGNAL GAIN FLATNESS

vs. FREQUENCY

MAX9508 toc04

FREQUENCY (Hz)

OUTPUT AMPLITUDE (dB)

1M 10M

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1.0

-1.0
100k 100M

V

OUT

= 2V

P-P

NORMALIZED TO 1MHz

GROUP DELAY

MAX9508 toc05

FREQUENCY (Hz)

DELAY (ns)

10M1M

0

25

50

75

100

125

150

-25

100k 100M

V

OUT

= 2V

P-P

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

MAX9508 toc06

FREQUENCY (Hz)

PSRR (dB)

10M1M100k

-70

-60

-50

-40

-30

-20

-10

0

-80
10k 100M

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

MAX9508 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1007550250-25

11.5

12.0

12.5

13.0

13.5

14.0

11.0

-50 125

VOLTAGE GAIN

vs. TEMPERATURE

MAX9508 toc08

TEMPERATURE (°C)

VOLTAGE GAIN (V/V)

1007550250-25

1.96

1.97

1.98

2.00

1.99

2.01

2.02

1.95

-50 125

OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX9508 toc09

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

1.51.00.50

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

-0.5

-0.5 2.0

YIN, CIN, CVBSIN
INPUTS ONLY

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

_______________________________________________________________________________________

7

Typical Operating Characteristics (continued)

(VDD= V

SHDN

= +3.3V, V

SMARTSLEEP

= V

INT/EXT

= V

GND

= 0V. RL = 150Ω to GND. TA= +25°C, unless otherwise noted.)

DIFFERENTIAL GAIN AND PHASE

0.3

0.2

0.1
0

-0.1

GAIN (%)

DIFFERENTIAL

-0.2

-0.3

0.8

0.4

0

-0.4

PHASE (deg)

DIFFERENTIAL

-0.8
176

NTC-7 VIDEO TEST

SIGNAL ON CVBS OUTPUTS

STEP

5432176

5432

MAX9508 toc13

MAX9508 toc10

CVBSIN
500mV/div

2T RESPONSE

100ns/div

PAL MULTIBURST RESPONSE

MAX9508 toc11

MAX9508 toc14

V

IN

200mV/div

V

OUT

400mV/div

CVBSIN
500mV/div

12.5T RESPONSE

400ns/div

PAL COLOR BARS

MAX9508 toc12

MAX9508 toc15

Y

IN

200mV/div

Y

OUT

400mV/div

CVBSIN
500mV/div

10μs/div

FIELD SQUARE-WAVE RESPONSE

2ms/div

MAX9508 toc16

CVBSOUT1
1V/div

CVBSIN
500mV/div

CVBSOUT1
1V/div

ENABLE TIME

INPUT VOLTAGE = 1V

10μs/div

2μs/div

MAX9508 toc17

CVBSOUT1
1V/div

OUTPUT
1V/div

SHDN
1V/div

DISABLE TIME

INPUT VOLTAGE = 1V

10μs/div

200ns/div

MAX9508 toc18

CVBSOUT1
1V/div

OUTPUT
1V/div

SHDN
1V/div

MAX9508

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VDD= V

SHDN

= +3.3V, V

SMARTSLEEP

= V

INT/EXT

= V

GND

= 0V. RL = 150Ω to GND. TA= +25°C, unless otherwise noted.)

PULLDOWN RESISTANCE

DISTRIBUTION

PROBABILITY

PULLDOWN RESISTANCE (Ω)

PROBABILITY

MAX9508 toc19

5.55.04.0 4.52.0 2.5 3.0 3.51.51.0 6.0

FREQUENCY RESPONSE

AT 27MHz DISTRIBUTION

PULLDOWN RESISTANCE

vs. TEMPERATURE

7.0

6.5

6.0

5.5

5.0

4.5

4.0

3.5

PULLDOWN RESISTANCE (Ω)

3.0

2.5

2.0

-50 125
TEMPERATURE (°C)

MAX9508 toc22

1007525 500-25

0

-20

-40

-60

CROSSTALK (dB)

-80

FREQUENCY RESPONSE

AT 6.75MHz DISTRIBUTION

MAX9508 toc20

PROBABILITY

ATTENUATION (dB)

INPUT-TO-INPUT CROSSTALK

vs. FREQUENCY

MAX9508 toc21

-0.1-0.2-0.3-0.4-0.5-0.6 0

MAX9508 toc23

-100

ATTENUATION (dB)

OUTPUT-TO-OUTPUT CROSSTALK

vs. FREQUENCY

0

-20

-40

-60

CROSSTALK (dB)

-80

-100

-120
100k 100M

FREQUENCY (Hz)

10M1M

-34-36-40 -38-48 -46 -44 -42-50-52 -32

MAX9508 toc24

-120
100k 100M

FREQUENCY (Hz)

OUTPUT IMPEDANCE

vs. FREQUENCY

100

10

1

OUTPUT IMPEDANCE (Ω)

0.1
100k 100M

1M 10M

FREQUENCY (Hz)

10M1M

MAX9508 toc25

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

_______________________________________________________________________________________ 9

Pin Description

PIN NAME FUNCTION

1, 13 V

DD

Power Supply. Bypass VDD with a 0.1µF capacitor to ground.

2 YIN Luma Video Input. Directly connect this input to the video DAC output.

3, 8 GND Ground

4 CVBSIN Internal CVBS Signal Input. Directly connect this input to the video DAC output.

5 EXTCVBSIN External CVBS Signal Input. AC-couple the signal through a 0.1µF capacitor to this input.

6 SHDN

Active-Low Shutdown Logic Input. Connect to logic low to place device in shutdown. Connect to
logic high for normal operation.

7 N.C. No Connection. Connect to GND.

9 CVBSOUT2 CVBS Output 2

10 CVBSOUT1 CVBS Output 1. CVBSOUT1 is actively pulled to GND when INT/EXT is logic high.

11 YOUT Luma Video Output

12 COUT Chroma Video Output

14 INT/EXT

Internal/External CVBS Logic Input. Connect INT/EXT low to process CVBS video signals from
CVBSIN input. Connect INT/EXT high to process CVBS video signals from EXTCVBSIN input.

15 SMARTSLEEP SmartSleep Logic Input. Connect to logic high to activate SmartSleep operation.

16 CIN Chroma Video Input. Directly connect this input to the video DAC output.

EP EP Exposed Pad. Connect EP to GND. EP is also internally connected to GND.

Detailed Description

In the typical application circuit for a portable DVD
player (Figure 1), the current DACs on a DVD decoder
chip generate video signals. When the internal signal
sources are selected, the MAX9508 filters those signals
and then drives the video connectors through a 75Ω
back termination resistor. When external video sources
are selected, the MAX9508 selects the external com­posite video signal (EXTCVBSIN), filters, and amplifies
it. The output stages of the amplifiers connected to

COUT, YOUT, and CVBSOUT1 become high imped­ance. The n-channel switch at CVBSOUT1 turns on,
thereby converting the back termination resistor into an
input termination resistor.

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 video signals or loads attached to the

MAX9508

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

10 ______________________________________________________________________________________

Figure 1. Typical Application Circuit for Portable DVD Player

+3.3V

0.1μF

V

DD

DVD CHIP

CURRENT

DAC

CURRENT

DAC

MICROCONTROLLER

+3.3V

INT/EXT

SMARTSLEEP

SHDN

CIN

YIN

BUFFER

BUFFER

CONTROL

LPF

LPF

MAX9508

LOGIC

6dB

6dB

LOAD SENSE

COUT

LOAD SENSE

YOUT

75Ω

TO TFT LCD

75Ω

SVIDEO CHROMA

75Ω

TO TFT LCD

75Ω

SVIDEO LUMA

ACTIVE VIDEO

DETECT

CURRENT

DAC

0.1μF

CVBSIN

BUFFER

EXTCVBSIN

CLAMP

LPF

GND

6dB

6dB

LOAD SENSE

CVBSOUT1

LOAD SENSE

CVBSOUT2

75Ω

CVBS

75Ω

TO Y/C SEPARATION

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

______________________________________________________________________________________ 11

Figure 2. Standby Mode

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 CVBSIN input and whether there
are loads connected at the outputs.

SmartSleep only works with DC-coupled loads.

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 CVBSIN signal. If no sync is
detected the device remains in standby mode.

VIDEO ENCODER

BUFFER

OFF

BUFFER

OFF

CURRENT

DAC

CURRENT

DAC

CIN

YIN

+3.3V

7μA

V

DD

LPF

LPF

OFF

OFF

6dB

OFF

6dB

OFF

LOAD SENSE

OFF

LOAD SENSE

OFF

COUT

YOUT

75Ω

75Ω

SVIDEO
CHROMA

SVIDEO
LUMA

CURRENT

DAC

NO VIDEO

SIGNAL

+3.3V

SMARTSLEEP

+3.3V

INT/EXT

SHDN

CVBSIN

EXTCVBSIN

CLAMP
OFF

CONTROL

LOGIC

ACTIVE VIDEO

DETECT

BUFFER

OFF

LPF

OFF

MAX9508

GND

6dB

OFF

6dB

OFF

LOAD SENSE

OFF

LOAD SENSE

OFF

CVBSOUT1

CVBSOUT2

75Ω

CVBS 1

75Ω

CVBS 2

MAX9508

Active-Detect Mode

The active video detect circuit slices the CVBSIN 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, a
video signal is present. When the MAX9508 detects a
video signal with sync at the CVBSIN 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
MAX9508 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.

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

12 ______________________________________________________________________________________

Figure 3. Active-Detect Mode with No Output Loads

VIDEO ENCODER

BUFFER

OFF

BUFFER

OFF

CURRENT

DAC

CURRENT

DAC

CIN

YIN

+3.3V

17μA

V

DD

LPF

LPF

OFF

OFF

6dB

OFF

6dB

OFF

LOAD SENSE

COUT

LOAD SENSE

YOUT

75Ω

75Ω

SVIDEO
CHROMA

SVIDEO
LUMA

INT/EXT

SMARTSLEEP

CURRENT

DAC

VIDEO SIGNAL

PRESENT

0

TO

50mV

+3.3V

+3.3V

SHDN

CVBSIN

EXTCVBSIN

CLAMP
OFF

CONTROL

LOGIC

ACTIVE VIDEO

DETECT

BUFFER

OFF

LPF

OFF

MAX9508

GND

6dB

OFF

6dB

OFF

LOAD SENSE

LOAD SENSE

CVBSOUT1

CVBSOUT2

75Ω

75Ω

CVBS 1

CVBS 2

NO
LOADS

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
based on the input signal presence and output loading.
Figures 4, 5, and 6 show which portions of the
MAX9508 turn on and which remain off with different
load configurations.

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 MAX9508 returns to standby mode.

If the SmartSleep feature is not activated and the part is
not in shutdown, 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.

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

______________________________________________________________________________________ 13

Figure 4. Full-Operation Mode with CVBSOUT1 Loaded

2.9mA QUIESCENT
SUPPLY CURRENT

PLUS

OUTPUT LOAD CURRENT

VIDEO ENCODER

BUFFER

OFF

BUFFER

OFF

CURRENT

DAC

CURRENT

DAC

CIN

YIN

+3.3V

V

DD

LPF

LPF

OFF

OFF

6dB

OFF

6dB

OFF

LOAD SENSE

COUT

LOAD SENSE

YOUT

75Ω

75Ω

SVIDEO
CHROMA

SVIDEO
LUMA

INT/EXT

SMARTSLEEP

CURRENT

DAC

VIDEO SIGNAL

PRESENT

0

TO

50mV

+3.3V

+3.3V

SHDN

CVBSIN

EXTCVBSIN

CLAMP
OFF

ACTIVE VIDEO

CONTROL

LOGIC

DETECT

BUFFER

LPF

MAX9508

GND

6dB

6dB

OFF

LOAD SENSE

LOAD SENSE

CVBSOUT1

CVBSOUT2

75Ω

75Ω

CVBS1

75Ω

CVBS 2

MAX9508

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

14 ______________________________________________________________________________________

Figure 5. Full-Operation Mode with CVBSOUT2 Loaded

+3.3V

2.9mA QUIESCENT
SUPPLY CURRENT

PLUS

VIDEO ENCODER

CURRENT

DAC

OUTPUT LOAD CURRENT

BUFFER

CIN

OFF

LPF

OFF

V

DD

LOAD SENSE

6dB

OFF

COUT

75Ω

SVIDEO
CHROMA

CLAMP
OFF

BUFFER

OFF

ACTIVE VIDEO

CURRENT

DAC

CURRENT

DAC

VIDEO SIGNAL

PRESENT

0

TO

50mV

+3.3V

SMARTSLEEP

+3.3V

YIN

INT/EXT

SHDN

CVBSIN

EXTCVBSIN

CONTROL

LOGIC

DETECT

BUFFER

LPF

OFF

LPF

MAX9508

GND

6dB

OFF

6dB

OFF

6dB

LOAD SENSE

LOAD SENSE

LOAD SENSE

YOUT

CVBSOUT1

CVBSOUT2

75Ω

75Ω

75Ω

SVIDEO
LUMA

CVBS 1

CVBS2

75Ω

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

______________________________________________________________________________________ 15

VIDEO ENCODER

Figure 6. Full-Operation Mode with All Outputs Loaded

CURRENT

DAC

+3.3V

10.5mA QUIESCENT

SUPPLY CURRENT

PLUS

OUTPUT LOAD CURRENT

BUFFER

CIN

LPF

V

DD

6dB

LOAD SENSE

COUT

75Ω

SVIDEO CHROMA

75Ω

CURRENT

DAC

CURRENT

DAC

VIDEO SIGNAL

PRESENT

0

TO

50mV

+3.3V

SMARTSLEEP

+3.3V

YIN

INT/EXT

SHDN

CVBSIN

EXTCVBSIN

CLAMP
OFF

BUFFER

CONTROL

LOGIC

ACTIVE VIDEO

DETECT

BUFFER

LPF

LPF

MAX9508

GND

6dB

6dB

6dB

LOAD SENSE

LOAD SENSE

LOAD SENSE

YOUT

CVBSOUT1

CVBSOUT2

75Ω

75Ω

75Ω

SVIDEO LUMA

75Ω

CVBS1

75Ω

CVBS2

75Ω

MAX9508

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

16 ______________________________________________________________________________________

Internal Mode Versus External Mode

Internal Mode

Set the INT/EXT control input low for internal mode. The
MAX9508 processes video signals from an internal

source such as a DVD chip (Figure 7). The 2:1 multi­plexer selects the video signal on CVBSIN. The
EXTCVBSIN video signal is ignored.

Figure 7. Internal Mode Operation for Portable DVD Applications

DVD CHIP

CURRENT

DAC

CURRENT

DAC

MICROCONTROLLER

CURRENT

DAC

+3.3V

LOGIC

LOW

INT/EXT

SMARTSLEEP

SHDN

CVBSIN

CIN

YIN

13mA QUIESCENT
SUPPLY CURRENT

BUFFER

BUFFER

CONTROL

LOGIC

ACTIVE VIDEO

DETECT

BUFFER

+3.3V

0.1μF

V

LPF

LPF

DD

MAX9508

6dB

6dB

6dB

LOAD SENSE

COUT

LOAD SENSE

YOUT

LOAD SENSE

CVBSOUT1

75Ω

TO TFT LCD

75Ω

SVIDEO CHROMA

75Ω

TO TFT LCD

75Ω

SVIDEO LUMA

75Ω

CVBS

LPF

GND

6dB

LOAD SENSE

CVBSOUT2

75Ω

0.1μF

EXTCVBSIN

CLAMP
OFF

TO Y/C SEPARATION

External Mode

Set the INT/EXT control input high for external mode.
The 2:1 multiplexer selects the video signal on
EXTCVBSIN (Figure 8). The YIN, CIN, and CVBSIN sig-

nals are ignored. The block drawing of the MAX9508 in
Figure 8 shows which circuits are off while in external
mode. SmartSleep does not function in external mode,
and the SMARTSLEEP input is ignored.

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

______________________________________________________________________________________ 17

Figure 8. External Mode Operation for Portable DVD Applications

4.3mA QUIESCENT
SUPPLY CURRENT

DVD CHIP

BUFFER

OFF

BUFFER

OFF

CONTROL

LOGIC

ACTIVE VIDEO

DETECT

BUFFER

LPF

OFF

LPF

OFF

CURRENT

DAC

CURRENT

DAC

MICROCONTROLLER

CURRENT

DAC

0V OR

+3.3V

+3.3V

LOGIC

HIGH

INT/EXT

SMARTSLEEP

CVBSIN

CIN

YIN

SHDN

+3.3V

V

DD

MAX9508

6dB

OFF

6dB

OFF

6dB

OFF

LOAD SENSE

OFF

LOAD SENSE

OFF

LOAD SENSE

OFF

COUT

YOUT

CVBSOUT1

75Ω

75Ω

75Ω

75Ω

75Ω 75Ω

TO TFT LCD

SVIDEO CHROMA

TO TFT LCD

SVIDEO LUMA

CVBS

VIDEO

SOURCE

EXTCVBSIN

CLAMP

0.1μF

LPF

GND

6dB

LOAD SENSE

CVBSOUT2

75Ω

TO Y/C SEPARATION

MAX9508

Inputs

The MAX9508 video inputs YIN, CIN, and CVBSIN
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
composite or luma signals is within 50mV of ground
and the blank level of the chroma signal is between

0.5V and 0.65V. Since the input buffer is identical for
YIN, CIN, and CVBSIN, any standard-definition video
signal can be applied to those inputs as long as the
signal is between ground and 1.05V when V

DD

= 2.7V.

For example, three composite video signals could be

applied to YIN, CIN, and CVBSIN. The RGB set and the
YPbPr set can also be inputs to YIN, CIN, and CVBSIN
(Figure 9).

The EXTCVBSIN input can only handle signals with a
sync pulse, such as composite, video, or luma.
Because the DC level of an external video input signal
is unknown, the external video signal is AC-coupled
through a 0.1µF capacitor, and a sync tip clamp sets
the internal DC level of the MAX9508. A 2:1 multiplexer
under the control of the INT/EXT input selects either the
signal at CVBSIN or EXTCVBSIN.

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

18 ______________________________________________________________________________________

Figure 9. Y, Pr, Pbor RGB Set Applied to MAX9508

VIDEO ENCODER

BUFFER

BUFFER

CURRENT

DAC

CURRENT

DAC

Pr/R

Pb/B

CIN

YIN

+3.3V

0.1μF

V

DD

LPF

LPF

6dB

6dB

LOAD SENSE

COUT

LOAD SENSE

YOUT

75Ω

Pr/R

75Ω

Pb/B

INT/EXT

LPF

MAX9508

GND

6dB

6dB

LOAD SENSE

LOAD SENSE

CVBSOUT1

CVBSOUT2

75Ω

75Ω

CURRENT

DAC

+3.3V

SMARTSLEEP

Y/G

+3.3V

SHDN

CVBSIN

EXTCVBSIN

CLAMP

CONTROL

LOGIC

ACTIVE VIDEO

DETECT

BUFFER

Y/G

Y/G

Video Reconstruction Filter

The MAX9508 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 a 4.2MHz bandwidth, and PAL sig­nals have a 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 standard­definition 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.

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
MAX9508 has an internal level-shift circuit that positions
the sync tip at approximately 300mV at the output. The
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 MAX9508 draws typically less
than 10nA 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, CIN, and CVBSIN 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 MAX9508 as close to the video
DAC outputs as possible.

AC-Coupling the Outputs

The outputs can be AC-coupled since the output stage
can source and sink current as shown in Figure 10.
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.

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

______________________________________________________________________________________ 19

MAX9508

Power-Supply Bypassing and Ground

The MAX9508 operates from a single-supply voltage
down to 2.7V, allowing for low-power operation. Bypass
VDDto GND with a 0.1µF capacitor. Place all external
components as close to the device as possible.

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

20 ______________________________________________________________________________________

Figure 10. AC-Coupled Outputs

+3.3V

0.1μF

V

DD

SET-TOP BOX CHIP

CURRENT

DAC

CIN

BUFFER

LPF

6dB

LOAD SENSE

COUT

75Ω

220μF

SVIDEO
CHROMA

CURRENT

DAC

CURRENT

DAC

+3.3V

GND

YIN

INT/EXT

SMARTSLEEP

SHDN

CVBSIN

EXTCVBSIN

CLAMP
OFF

BUFFER

CONTROL

LOGIC

ACTIVE VIDEO

DETECT

BUFFER

LPF

LPF

MAX9508

GND

6dB

6dB

6dB

LOAD SENSE

LOAD SENSE

LOAD SENSE

YOUT

CVBSOUT1

CVBSOUT2

75Ω

75Ω

75Ω

220μF

220μF

220μF

SVIDEO
LUMA

CVBS 1

CVBS 2

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

______________________________________________________________________________________ 21

Block Diagrams (continued)

0

TO

50mV

CIN

YIN

INT/EXT

SMARTSLEEP

SHDN

CVBSIN

EXTCVBSIN

CLAMP

BUFFER

BUFFER

CONTROL

LOGIC

ACTIVE VIDEO

DETECT

BUFFER

LPF

LPF

MAX9508

LPF

LOAD SENSE

6dB

LOAD SENSE

6dB

LOAD SENSE

6dB

LOAD SENSE

6dB

COUT

YOUT

CVBSOUT1

CVBSOUT2

300mV

TO

400mV

MAX9508

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

22 ______________________________________________________________________________________

Pin Configuration

Chip Information

PROCESS: BiCMOS

TOP VIEW

13

V

DD

14

INT/EXT

CIN

15

16

SMARTSLEEP

11

MAX9508

2

YIN YOUT

CVBSOUT1

4

GND

COUT

12 10 9

+

13

DD

V

THIN QFN

(3mm x 3mm)

CVBSOUT2

8

7

6

5

CVBSIN

GND

N.C.

SHDN

EXTCVBSIN

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

______________________________________________________________________________________ 23

PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

16 TQFN-EP T1633-4

21-0136

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.

MARKING

E/2

D/2

D

0.10 C 0.08 C

AAAA

E

(ND - 1) X e

e

C

L

k

C

L

C

L

A

A2

A1

L

(NE - 1) X e

L

E2

E2/2

D2/2

b

C

L

D2

0.10 M C A B

L

12x16L QFN THIN.EPS

e

PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm

e

21-0136

1

I

2

MAX9508

CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support

24 ______________________________________________________________________________________

Package Information (continued)

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.)

PKG

REF. MIN.

MIN.

0.70 0.75 0.80

A

b

0.25 0.30 0.35

D

2.90

E

2.90 3.00 3.10

e

L

0.35

ND

NE

0

A1

A2

k

0.25

8L 3x3

NOM. MAX.

3.00 3.10

0.65 BSC.

0.55 0.75

8

2

2

0.02

0.20 REF

-

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 0.20 mm AND 0.25 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 REVISION C.

10. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.

11. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.

12. WARPAGE NOT TO EXCEED 0.10mm.

0.05

12L 3x3

0.70

0.20

2.90

2.90

0.50 BSC.

0.45

0

0.20 REF

-

0.25

16L 3x3

NOM. MAX. NOM.

0.75

0.25

3.00

3.00

0.55

12N

3

0.0230.05

-

MIN. MAX.

0.70

0.80

0.20

0.30

2.90

3.10

3.10

2.90

0.65

0.30

-

0.25

0.75

0.25

3.00

3.00

0.50 BSC.

0.40

16

040.02

0.20 REF

EXPOSED PAD VARIATIONS

PKG.

0.80

0.30

3.10

3.10

0.50

4

0.05

-

-

CODES

TQ833-1 1.250.25 0.70 0.35 x 45° WEEC1.250.700.25

T1233-1

T1233-3

T1233-4

T1633-2 0.95

T1633F-3

T1633FH-3 0.65 0.80 0.95

T1633-4 0.95

T1633-5 0.95

D2

MIN.

NOM.

MAX.

0.95

0.95

0.65

1.25

1.10

1.25

1.10

1.251.10

1.25

1.10

0.95

0.80

1.10 1.25 0.95 1.10

1.25

1.10

NOM.

MIN.

1.10

0.95

0.95 1.10 0.35 x 45°1.25 WEED-10.95

1.100.95

1.10

0.95

0.80

0.65

0.65 0.80

1.10 1.25

0.95

E2

PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm

MAX.

0.35 x 45°

1.25

0.35 x 45°

1.25

0.35 x 45°

0.95

0.225 x 45°

0.95

0.225 x 45°

1.25

0.35 x 45°

0.35 x 45° WEED-2

PIN ID

WEED-1

WEED-11.25

WEED-2

WEED-2

WEED-2

WEED-2

21-0136

JEDEC

2

I

2

MAX9508

CVBS/S-Video Filter Amplifier with

SmartSleep and Bidirectional Video Support

Heaney

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 ____________________

25

© 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

Revision History

REVISION

NUMBER

2 1/09 Removed QSOP package 1, 2, 9, 22

REVISION

DATE

DESCRIPTION

PAGES

CHANGED