MAXIM MAX9503 Technical data

General Description

The MAX9503 filters and amplifies standard-definition
video signals. Maxim’s DirectDrive™ technology elimi­nates large output-coupling capacitors and sets the
video black level to ground. The input of the MAX9503
can be directly connected to the output of a video
digital-to-analog converter (DAC). The MAX9503 pro­vides a compact, integrated, and low-power solution.

An internal reconstruction filter smoothes the steps and
reduces the spikes on the video signal from the DAC.
The reconstruction filter typically has 3dB attenuation at
9MHz and 50dB attenuation at 27MHz, and ±1dB pass­band flatness to 5.5MHz.

Maxim’s DirectDrive uses an integrated charge pump
and a linear regulator to create a clean negative power
supply to drive the sync below ground. The charge
pump injects so little noise into the video output that the
picture is visibly flawless.

The MAX9503 is available with +6dB (MAX9503G) and
+12dB (MAX9503M) gains. The device operates from a

2.7V to 3.6V single supply and features a 10nA low­power shutdown mode.

The MAX9503 is offered in space-saving 16-pin QSOP
and 16-pin TQFN packages and is specified over the

-40°C to +85°C extended temperature range.

Applications

Digital Still Cameras

Mobile Phones/Smartphones

Security Cameras

Portable Media Players

Space-Constrained, Low-Power Portable
Devices

Features

♦ DC-Coupled Output

♦ Direct Connection to Video DAC

♦ Video Output Black Level Set to Ground

♦ Video Reconstruction Filter with 50dB

Attenuation at 27MHz

♦ Preset Gain

6dB (MAX9503G)
12dB (MAX9503M)

♦ 10nA Shutdown Supply Current

♦ 2.7V to 3.6V Single-Supply Operation

MAX9503

DirectDrive Video Amplifier with

Reconstruction Filter

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

0 TO 50mV

0V

-0.1V TO
+0.1V

MAX9503

AMP

LINEAR

REGULATOR

CHARGE

PUMP

BUFFER

VIDOUT

VIDIN

MAX9503G: 6dB
MAX9503M: 12dB

LOWPASS

FILTER

0V

19-3676; Rev 1; 8/05

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.

EVALUATION KIT

AVAILABLE

PART*

PIN­PACKAGE

PKG CODE

TOP MARK

MAX9503GEEE

16 QSOP E16-4 —

MAX9503GETE

16 TQFN T1633-4 ACU

MAX9503MEEE

16 QSOP E16-4 —

MAX9503METE

16 TQFN T1633-4 ACV

Functional Diagram/Typical Operating Circuit and Pin
Configurations appear at end of data sheet.

*All devices are specified over the -40°C to +85°C operating

temperature range.

Block Diagram

MAX9503

DirectDrive Video Amplifier with
Reconstruction Filter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= CPVDD= SHDN = 3.0V, SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, R

BIAS

= 100kΩ, TA= T

MIN

to T

MAX

.

R

L

= 150Ω to SGND, unless otherwise noted. V

VIDIN

= 286mV (MAX9503G), V

VIDIN

= 143mV (MAX9503M). Typical values are at

V

DD

= CPV

DD

= SHDN = 3.0V, TA= +25°C, unless otherwise noted.) (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.

VDDto SGND............................................................-0.3V to +4V

VIDIN to SGND .........................................................-0.3V to +4V

BIAS to SGND ............................................-0.3V to (V

DD

+ 0.3V)

SHDN to SGND ........................................................-0.3V to +4V

VIDOUT to SGND........................(The greater of V

SS

and -2V) to

(V

DD

+ 0.3V)

CPV

DD

to CPGND ....................................................-0.3V to +4V

C1P, C1N, CPV

SS

.............................Capacitor Connection Only

CPGND, SGND, GND............................................-0.1V to +0.1V

CPV

SS

to V

SS ..................................................................

-0.1V to +0.1V

VIDOUT Short Circuit to V

DD

, SGND

and the Greater of (V

SS

and -2V) ...........................Continuous

Continuous Current

VIDIN, BIAS, SHDN ......................................................±20mA

Continuous Power Dissipation (T

A

= +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW

16-Pin TQFN (derate 15.6mW/°C above +70°C) .......1349mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

CONDITIONS

Supply Voltage Range

V

DD

,

CPV

DD

Guaranteed by DC voltage gain and
quiescent current

2.7 3.6 V

Quiescent Supply Current I

DD

VDD = 3.6V (IDD = I

VDD

+ I

CPVDD

, RL = ∞) 1215mA

Shutdown Supply Current I

SHDN

VDD = 3.6V (I

SHDN

= I

VDD

+ I

CPVDD

),

SHDN = SGND

1µA

Bias Voltage V

BIAS

1V

VIDEO AMPLIFIER

MAX9503G

Guaranteed by DC

MAX9503M

MAX9503G

Input Voltage Range

Guaranteed by DC
voltage gain, V

DD

= 3V

MAX9503M

V

Input Current I

IN

VDD = 2.7V

µA

Input Resistance R

IN

1MΩ

MAX9503G 5.5 6 6.5

DC Voltage Gain (Note 2) A

V

VDD = 2.7V to 3.6V

MAX9503M

12

dB

MAX9503G

0

Output Black Level (Note 3) VDD = 2.7V

MAX9503M

0

V

Output Voltage Swing

V

P-P

Output Short-Circuit Current I

SC

Sinking or sourcing 50 mA

MAX9503G

Output Resistance R

OUT

MAX9503M

Ω

MAX9503G 4.2

Shutdown Output Impedance

SHDN = SGND

MAX9503M 8.2

kΩ

SYMBOL

MIN TYP MAX UNITS

V

RANGE

R

OUTSHDN

voltage gain, V

= 2.7V

DD

-0.10 +1.05

-0.050 +0.525

-0.10 +1.28

-0.05 +0.64

-2.5 +2.5

Guaranteed by DC voltage gain, VDD = 2.7V 2.162

11.5

-0.1

-0.15

Guaranteed by DC voltage gain, VDD = 3V 2.594

0.01

12.5

+0.1

+0.15

0.01

0.02

MAX9503

DirectDrive Video Amplifier with

Reconstruction Filter

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= CPVDD= SHDN = 3.0V, SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, R

BIAS

= 100kΩ, TA= T

MIN

to T

MAX

.

R

L

= 150Ω to SGND, unless otherwise noted. V

VIDIN

= 286mV (MAX9503G), V

VIDIN

= 143mV (MAX9503M). Typical values are at

V

DD

= CPV

DD

= SHDN = 3.0V, TA= +25°C, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CHARGE PUMP

Switching Frequency

300 kHz

LOGIC SIGNALS

Logic-Low Threshold V

IL

VDD = 2.7V to 3.6V 0.5 V

Logic-High Threshold V

IH

VDD = 2.7V to 3.6V 1.5 V

Logic Input Current I

IL

1µA

AC ELECTRICAL CHARACTERISTICS

(V

DD

= CPV

DD

= SHDN = 3.0V, SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, R

BIAS

= 100kΩ, TA= T

MIN

to T

MAX

. RL =

150Ω to SGND, unless otherwise noted. V

VIDIN

= 286mV (MAX9503G), V

VIDIN

= 143mV (MAX9503M). Typical values are at VDD=

CPV

DD

= SHDN = 3.0V, TA= +25°C, unless otherwise noted.) (Note 1)

PARAMETER

CONDITIONS

UNITS

Passband Flatness VDD = 2.7V, f = 100kHz to 5.5MHz -1 0 +1 dB

f = 9.1MHz 3

Attenuation

V

DD

= 2.7V,

VIDOUT= 2V

P-P

, attenuation

is referred to 100kHz

f = 27MHz 35 50

dB

MAX9503G 62

Power-Supply Rejection Ratio PSRR f = 100kHz

MAX9503M 56

dB

MAX9503G 0.5

Output Impedance Z

OUT

f = 5MHz

MAX9503M

Ω

MAX9503G 0.1

Differential Gain Error DG NTSC, VIDOUT = 2V

P-P

MAX9503M 0.1

%

MAX9503G 0.2

Differential Phase Error DP NTSC, VIDOUT = 2V

P-P

MAX9503M 0.2

D egr ees

2T Pulse-to-Bar K Rating

2T = 250ns, bar time is 18µs, the beginning

2.5% and the ending 2.5% of the bar time
are ignored

K%

2T Pulse Response 2T = 250ns 0.3 K%

2T Bar Response

2T = 250ns, bar time is 18µs, the beginning

2.5% and the ending 2.5% of the bar time
are ignored

0.7 K%

Nonlinearity 5-step staircase 0.2 %

Group-Delay Distortion D

Dt

100kHz to 5.5MHz 10 ns

VIDOUT Capacitive-Load Stability

C

L

V

OUT

= 2V

P-P

, no sustained oscillations 20 pF

SYMBOL

150 250

MIN TYP MAX

0.65

-0.3

MAX9503

DirectDrive Video Amplifier with
Reconstruction Filter

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(V

DD

= CPV

DD

= SHDN = 3.0V, SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, R

BIAS

= 100kΩ, TA= T

MIN

to T

MAX

. RL =

150Ω to SGND, unless otherwise noted. V

VIDIN

= 286mV (MAX9503G), V

VIDIN

= 143mV (MAX9503M). Typical values are at VDD=

CPV

DD

= SHDN = 3.0V, TA= +25°C, unless otherwise noted.) (Note 1)

PARAMETER

CONDITIONS

UNITS

MAX9503G 64

Peak Signal-to-RMS Noise SNR 100kHz to 5.5MHz

MAX9503M 58

dB

Enable Time t

ON

VIDIN = 0.5V, VIDOUT settled to within 1%
of the final voltage

0.2 ms

Disable Time t

OFF

VIDIN = 0.5V, VIDOUT settled to below 1%
of the output voltage

0.1 ms

Note 1: All devices are 100% production tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Voltage gain (A

V

) is a two-point measurement in which the output voltage swing is divided by the input voltage swing.

Note 3: With an output load attached, this offset will directly contribute to quiescent current.

MAX9503G

SMALL-SIGNAL GAIN vs. FREQUENCY

MAX9503 toc01

FREQUENCY (MHz)

GAIN (dB)

101

-70

-60

-50

-40

-30

-20

-10

0

10

20

-80

0.1 100

V

VIDOUT

= 100mV

P-P

GAIN = 6dB

MAX9503M

SMALL-SIGNAL GAIN vs. FREQUENCY

MAX9503 toc02

FREQUENCY (MHz)

GAIN (dB)

101

-70

-60

-50

-40

-30

-20

-10

0

10

20

-80

0.1 100

V

VIDOUT

= 100mV

P-P

GAIN = 12dB

MAX9503G SMALL-SIGNAL

GAIN FLATNESS vs. FREQUENCY

MAX9503 toc03

FREQUENCY (MHz)

GAIN FLATNESS (dB)

1

4

5

6

7

8

3

0.1 10

V

VIDOUT

= 100mV

P-P

GAIN = 6dB

Typical Operating Characteristics

(VDD= CPV

DD

= SHDN = 3.0V, SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1µF, R

BIAS

= 100kΩ, TA= T

MIN

to

T

MAX

. R

IN

= 150Ω to SGND, unless otherwise noted. V

VIDIN

= 286mV (MAX9503G), V

VIDIN

= 143mV (MAX9503M). Typical values

are at T

A

= +25°C, unless otherwise noted.)

SYMBOL

MIN TYP MAX

MAX9503

DirectDrive Video Amplifier with

Reconstruction Filter

_______________________________________________________________________________________ 5

MAX9503M SMALL-SIGNAL

GAIN FLATNESS vs. FREQUENCY

MAX9503 toc04

FREQUENCY (MHz)

GAIN FLATNESS (dB)

1

10

11

13

12

14

15

9

0.1 10

V

VIDOUT

= 100mV

P-P

GAIN = 12dB

MAX9503G

LARGE-SIGNAL GAIN vs. FREQUENCY

MAX9503 toc05

FREQUENCY (MHz)

GAIN (dB)

101

-70

-60

-50

-40

-30

-20

-10

0

10

20

-80

0.1 100

V

VIDOUT

= 2V

P-P

GAIN = 6dB

MAX9503M

LARGE-SIGNAL GAIN vs. FREQUENCY

MAX9503 toc06

FREQUENCY (MHz)

GAIN (dB)

101

-70

-60

-50

-40

-30

-20

-10

0

10

20

-80

0.1 100

V

VIDOUT

= 2V

P-P

GAIN = 12dB

MAX9503G LARGE-SIGNAL

GAIN FLATNESS vs. FREQUENCY

MAX9503 toc07

FREQUENCY (MHz)

GAIN FLATNESS (dB)

1

4

5

6

7

8

3

0.1 10

V

VIDOUT

= 2V

P-P

GAIN = 6dB

MAX9503M LARGE-SIGNAL

GAIN FLATNESS vs. FREQUENCY

MAX9503 toc08

FREQUENCY (Hz)

GAIN FLATNESS (dB)

1

10

11

12

13

14

9

0.1 10

V

VIDOUT

= 2V

P-P

GAIN = 12dB

MAX9503G GROUP DELAY

MAX9503 toc09

FREQUENCY (MHz)

GROUP DELAY (ns)

101

25

50

75

100

125

150

0

0.1 100

V

VIDOUT

= 2V

P-P

MAX9503M GROUP DELAY

MAX9503 toc10

FREQUENCY (MHz)

GROUP DELAY (ns)

101

25

50

75

100

125

150

0

0.1 100

V

VIDOUT

= 2V

P-P

Typical Operating Characteristics (continued)

(VDD= CPV

DD

= SHDN = 3.0V, SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1µF, R

BIAS

= 100kΩ, TA= T

MIN

to

T

MAX

. R

IN

= 150Ω to SGND, unless otherwise noted. V

VIDIN

= 286mV (MAX9503G), V

VIDIN

= 143mV (MAX9503M). Typical values

are at T

A

= +25°C, unless otherwise noted.)

MAX9503

DirectDrive Video Amplifier with
Reconstruction Filter

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VDD= CPV

DD

= SHDN = 3.0V, SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1µF, R

BIAS

= 100kΩ, TA= T

MIN

to

T

MAX

. R

IN

= 150Ω to SGND, unless otherwise noted. V

VIDIN

= 286mV (MAX9503G), V

VIDIN

= 143mV (MAX9503M). Typical values

are at T

A

= +25°C, unless otherwise noted.)

MAX9503G POWER-SUPPLY

REJECTION RATIO vs. FREQUENCY

MAX9503 toc11

FREQUENCY (MHz)

PSRR (dB)

10.1

-100

-80

-60

-40

-20

0

20

-120

0.01 10

MAX9503M POWER-SUPPLY

REJECTION RATIO vs. FREQUENCY

MAX9503 toc12

FREQUENCY (MHz)

PSRR (dB)

10.1

-100

-80

-60

-40

-20

0

20

-120

0.01 10

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

MAX9503 toc13

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

603510-15

11

12

13

14

10

-40 85

MAX9503M

MAX9503G

MAX9503G VOLTAGE GAIN

vs. TEMPERATURE

MAX9503 toc14

TEMPERATURE (°C)

VOLTAGE GAIN (dB)

603510-15

5.9

6.0

6.1

6.2

5.8

-40 85

MAX9503M VOLTAGE GAIN

vs. TEMPERATURE

MAX9503 toc15

TEMPERATURE (°C)

VOLTAGE GAIN (dB)

603510-15

11.8

11.9

12.0

12.1

12.2

12.3

11.7

-40 85

MAX9503G OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX9503 toc16

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

2.31.81.30.80.3

0

1

2

3

4

-1

-0.2 2.8

MAX9503M OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX9503 toc17

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

0.8 1.00.60.40.20

-1

0

1

2

3

4

-2

-0.2 1.2

MAX9503G

DIFFERENTIAL GAIN AND PHASE

MAX9503 toc18

DIFFERENTIAL GAIN (%)

5432

0.2

0.1

-0.1

0

0.3

-0.3
16

DIFFERENTIAL PHASE (deg)

5432

0.2

0.1

-0.2

-0.1

0

0.3

-0.3
16

-0.2

MAX9503M

DIFFERENTIAL GAIN AND PHASE

MAX9503 toc19

DIFFERENTIAL GAIN (%)

5432

0.2

0.1

-0.1

0

0.3

-0.3
16

DIFFERENTIAL PHASE (deg)

5432

0.3

0.1

-0.3

-0.2

-0.1

0

0.4

-0.4
16

-0.2

0.2

MAX9503

DirectDrive Video Amplifier with

Reconstruction Filter

_______________________________________________________________________________________ 7

MAX9503G 2T RESPONSE

MAX9503 toc20

VIDIN
200mV/div

VIDOUT
400mV/div

100ns/div

MAX9503M 2T RESPONSE

MAX9503 toc21

VIDIN
100mV/div

VIDOUT
400mV/div

100ns/div

MAX9503G 12.5T RESPONSE

MAX9503 toc22

VIDIN
250mV/div

VIDOUT
500mV/div

400ns/div

300mV

0V

MAX9503M 12.5T RESPONSE

MAX9503 toc23

VIDIN
100mV/div

VIDOUT
400mV/div

400ns/div

0V

150mV

MAX9503G OUT RESPONSE

TO NTC-7 VIDEO TEST SIGNAL

MAX9503 toc24

VIDIN
500mV/div

VIDOUT
1V/div

10μs/div

0V

0V

MAX9503M OUT RESPONSE

TO NTC-7 VIDEO TEST SIGNAL

MAX9503 toc25

VIDIN
250mV/div

VIDOUT
1V/div

10μs/div

0V

0V

MAX9503G OUT RESPONSE TO BLACK-

TO-WHITE VIDEO TEST SIGNAL

MAX9503 toc26

VIDIN
500mV/div

VIDOUT
1V/div

2ms/div

0V

0V

MAX9503M OUT RESPONSE TO BLACK-

TO-WHITE VIDEO TEST SIGNAL

MAX9503 toc27

VIDIN
250mV/div

VIDOUT
1V/div

2ms/div

0V

0V

Typical Operating Characteristics (continued)

(VDD= CPV

DD

= SHDN = 3.0V, SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1µF, R

BIAS

= 100kΩ, TA= T

MIN

to

T

MAX

. R

IN

= 150Ω to SGND, unless otherwise noted. V

VIDIN

= 286mV (MAX9503G), V

VIDIN

= 143mV (MAX9503M). Typical values

are at T

A

= +25°C, unless otherwise noted.)

MAX9503

Detailed Description

The MAX9503 completely eliminates the need for
capacitors in the video output by using Maxim’s
DirectDrive technology that includes an inverting charge
pump and linear regulator. The charge pump and linear
regulator create a clean negative supply allowing the
amplifier output to swing below ground. The amplifier
output can swing both positive and negative so that the
video signal black level can be placed at ground. The
MAX9503 features a six-pole, Butterworth filter to per­form reconstruction filtering on the video input signal
from the DAC.

DirectDrive

Background

Integrated video filter/amplifier circuits operating from a
single, positive supply usually create video output sig­nals that are level-shifted above ground to keep the
signal within the linear range of the output amplifier. For
applications in which the positive DC level shift of the
video signal is not acceptable, a series capacitor can
be inserted in the output connection in an attempt to
eliminate the positive DC level shift. The series capaci­tor cannot truly level shift a video signal because the
average level of the video varies with picture content.
The series capacitor biases the video output signal
around ground, but the actual level of the video signal
can vary significantly depending upon the RC time con­stant and the picture content.

The series capacitor creates a highpass filter. Since
the lowest frequency in video is the frame rate, which
can be between 24Hz and 30Hz, the pole of the high­pass filter should ideally be an order of magnitude
lower in frequency than the frame rate. Therefore, the
series capacitor must be very large, typically from
220µF to 3000µF. For space-constrained equipment,
the series capacitor is unacceptable. Changing from a
single series capacitor to a SAG network that requires
two smaller capacitors can only reduce space and
cost slightly.

The series capacitor in the usual output connection
also prevents damage to the output amplifier if the con­nector is shorted to a supply or to ground. While the
output connection of the MAX9503 does not have a
series capacitor, the MAX9503 will not be damaged if
the connector is shorted to a supply or to ground (see
the Short-Circuit Protection section).

Video Amplifier

Typically, the black level of the video signal created by
the video DAC is around 300mV. The MAX9503 shifts
the black level to ground at the output so that the active
video is above ground, and sync is below ground. The
amplifier needs a negative supply for its output stage to
remain in its linear region when driving sync below
ground.

DirectDrive Video Amplifier with
Reconstruction Filter

8 _______________________________________________________________________________________

Pin Description

PIN

QSOP TQFN

NAME

FUNCTION

115VSSNegative Power Supply. Connect to CPVSS.

216

Charge-Pump Negative Power Supply. Bypass with a 1µF capacitor to CPGND.

3 1 C1N

Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor from C1P to C1N.

42

Charge-Pump Power Ground

5 3 C1P Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor from C1P to C1N.

64

Charge-Pump Positive Power Supply. Bypass with a 1µF capacitor to CPGND.

7 5 BIAS Common-Mode Voltage. Connect a 100kΩ resistor from BIAS to SGND.

86

Signal Ground. Connect to GND.

9 7 VIDIN Video Input

10, 14, 15

N.C. No Connection. Not internally connected. Connect to SGND.

11 9 SHDN Active-Low Shutdown. Connect to VDD for normal operation.

12 10 GND Ground. Connect to SGND.

13 11 V

DD

Positive Power Supply. Bypass with a 1µF capacitor to SGND.

16 13

Video Output

— EP EP Exposed Paddle. Connect to GND.

CPV

SS

CPGND

CPV

DD

SGND

8, 12, 14

VIDOUT

The MAX9503 has an integrated charge pump and linear
regulator to create a low-noise negative supply from the
positive supply voltage. The charge pump inverts the
positive supply to create a raw negative voltage that is
then fed into the linear regulator, which outputs -2V. The
linear regulator filters out the charge-pump noise.

Comparison Between DirectDrive Output

vs. AC-Coupled Output

The actual level of the video signal varies less with a
DirectDrive output than an AC-coupled output. The
video signal average can change greatly depending
upon the picture content. With an AC-coupled output,
the average will change according to the time constant
formed by the series capacitor and series resistance
(usually 150Ω). For example, Figure 1 shows an AC­coupled video signal alternating between a completely
black screen and a completely white screen. Notice the
excursion of the video signal as the screen changes.

With the DirectDrive amplifier, the black level is held at
ground. The video signal is constrained between

-0.3V to +0.7V. Figure 2 shows the video signal from a
DirectDrive amplifier with the same input signal as the
AC-coupled system.

Video Reconstruction Filter

Before the video signal from the DAC can be amplified,
it must be lowpass filtered to smooth the steps and to
reduce the spikes created whenever the DAC output
changes value. In the frequency domain, the steps and
spikes cause images of the video signal to appear at
multiples of the sampling clock. The MAX9503 contains
a six-pole Butterworth lowpass filter. The passband
extends to 5.5MHz, and the minimum attenuation is
35dB at 27MHz.

Short-Circuit Protection

The MAX9503 typical application circuit includes a 75Ω
back-termination resistor that limits short-circuit current if
an external short is applied to the video output. The
MAX9503 features internal output, short-circuit protection
to prevent device damage in prototyping and applica­tions where the amplifier output can be directly shorted.

Shutdown

The MAX9503 features a low-power shutdown mode for
battery-powered/portable applications. Shutdown
reduces the quiescent current to less than 10nA.
Connecting SHDN to ground (SGND) disables the out­puts and places the MAX9503 into a low-power shut­down mode. In shutdown mode, the amplifier, charge
pump, and linear regulator are turned off and the video
output impedance is 4kΩ.

MAX9503

DirectDrive Video Amplifier with

Reconstruction Filter

_______________________________________________________________________________________ 9

INPUT
500mV/div

OUTPUT
500mV/div

2ms/div

Figure 1. AC-Coupled Output

INPUT
500mV/div

OUTPUT
1V/div

2ms/div

0V

0V

Figure 2. DirectDrive Output

MAX9503

Applications Information

Power-Supply Bypassing and Ground

Management

The MAX9503 operates from a 2.7V to 3.6V single sup­ply and requires proper layout and bypassing. For the
best performance, place the components as close to
the device as possible.

Proper grounding improves performance and prevents
any switching noise from coupling into the video signal.
Connect GND and SGND together at a single point on
the PC board. Route all traces that carry switching tran-

sients away from SGND. Return SGND to the lowest
impedance ground available. Route CPGND and all
traces carrying switching transients away from SGND,
GND, and other traces and components in the video
signal path. Bypass the analog supply (VDD) with a 1µF
capacitor to SGND, placed as close to the device as
possible. Bypass the charge-pump supply (CPVDD)
with a 1µF capacitor to CPGND, placed as close to the
device as possible. Connect CPV

SS

to V

SS

and bypass
with a 1µF capacitor to CPGND as close to the device
as possible.

DirectDrive Video Amplifier with
Reconstruction Filter

10 ______________________________________________________________________________________

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

V

SS

VIDOUT

N.C.

N.C.

V

DD

GND

SHDN

N.C.

VIDIN

QSOP

CPV

SS

C1N

CPV

DD

CPGND

C1P

BIAS

SGND

MAX9503

12

13

14

15

16

8

7

6

5

11 10 9

1234

N.C.

VDDGND

SHDN

N.C.

VIDIN

SGND

BIAS

N.C.

V

SS

CPV

SS

C1N

CPGND

C1P

CPV

DD

VIDOUT

TOP VIEW

MAX9503

3mm x 3mm TQFN

Pin Configurations

MAX9503

DirectDrive Video Amplifier with

Reconstruction Filter

______________________________________________________________________________________ 11

MAX9503G

(MAX9503M)

SHUTDOWN

CIRCUIT

LINEAR

REGULATOR

CHARGE PUMP

RECONSTRUCTION

FILTER

1V

AMP

BUFFER

V

DD

DC

LEVEL SHIFT

75Ω

75Ω

VIDOUT

6dB

(12dB)

CPGND C1P C1N CPV

SS

V

SS

C1

1μF

C2
1μF

100kΩ

BIAS

V

DD

1μF

C3

1μF

CPV

DD

V

DD

GND

SGND

VIDIN

SHDN

DAC

VIDEO

ASIC

Functional Diagram/Typical Operating Circuit

Chip Information

PROCESS: BiCMOS

MAX9503

DirectDrive Video Amplifier with
Reconstruction Filter

12 ______________________________________________________________________________________

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

.)

QSOP.EPS

MAX9503

DirectDrive Video Amplifier with

Reconstruction Filter

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 ____________________ 13

© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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

.)

MARKING

D/2

D

0.10 C 0.08 C

E/2

AAAA

E

(ND - 1) X e

C

L

C
L

C

A

A2

A1

L

L

e

(NE - 1) X e

D2/2

e

k

E2/2

L

E2

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

e

b

C

L

21-0136

D2

0.10 M C A B

L

12x16L QFN THIN.EPS

1

I

2

8L 3x3

PKG

REF. MIN.

MIN.

NOM. MAX.

0.70 0.75 0.80

A

b

0.25 0.30 0.35

D

2.90

3.00 3.10

E

2.90 3.00 3.10

e

0.65 BSC.

L

0.35

0.55 0.75

ND

NE

0

0.02

A1

A2

0.20 REF

0.25

k

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 T ERMINALS.

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.

12L 3x3

NOM. MAX. NOM.

0.70

0.75

0.20

0.25

2.90

3.00

2.90

3.00

0.50 BSC.

0.45

8

2

2

-

0.55

12N

0.05

0.0230.05

0

0.20 REF

-

0.25

3

-

0.80

0.30

3.10

3.10

0.65

-

16L 3x3

MIN. MAX.

0.70

0.75

0.20

0.25

2.90

3.00

2.90

3.00

0.50 BSC.

0.30

0.40

16

4

040.02

0.20 REF

-

0.25

EXPOSED PAD VARIATIONS

PKG.

0.80

0.30

3.10

3.10

0.50

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.

0.95

1.10

1.10

0.95

1.10

0.65

0.80

1.10 1.25 0.95 1.10

1.10

MAX.

E2

PIN ID

NOM.

MIN.

MAX.

1.25

1.10

0.95

1.25

1.251.10

1.25

0.95

1.25

1.25

0.95 1.10 0.35 x 45°1.25 WEED-10.95

1.100.95

1.10

1.25

0.95

0.80

0.95

0.65

0.95

0.65 0.80

1.25

1.10 1.25

0.95

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

JEDEC

WEED-1

0.35 x 45°

WEED-11.25

0.35 x 45°

0.35 x 45°

WEED-2

0.225 x 45°

WEED-2

0.225 x 45°

WEED-2

0.35 x 45°

WEED-2

0.35 x 45° WEED-2

21-0136

2

I

2