19-3676; Rev 1; 8/05
KIT
ATION
EVALU
LE
B
A
IL
A
AV
DirectDrive Video Amplifier with
Reconstruction Filter
Features
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.
♦ DC-Coupled Output
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.
♦ Preset Gain
6dB (MAX9503G)
12dB (MAX9503M)
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
♦ Direct Connection to Video DAC
♦ Video Output Black Level Set to Ground
♦ Video Reconstruction Filter with 50dB
Attenuation at 27MHz
♦ 10nA Shutdown Supply Current
♦ 2.7V to 3.6V Single-Supply Operation
Ordering Information
PINPACKAGE
PART*
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
*All devices are specified over the -40°C to +85°C operating
temperature range.
Digital Still Cameras
Mobile Phones/Smartphones
Functional Diagram/Typical Operating Circuit and Pin
Configurations appear at end of data sheet.
Security Cameras
Portable Media Players
Space-Constrained, Low-Power Portable
Devices
Block Diagram
0 TO 50mV
-0.1V TO
+0.1V
MAX9503
0V
BUFFER
0V
VIDIN
LOWPASS
FILTER
AMP
LINEAR
REGULATOR
CHARGE
PUMP
VIDOUT
MAX9503G: 6dB
MAX9503M: 12dB
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX9503
General Description
MAX9503
DirectDrive Video Amplifier with
Reconstruction Filter
ABSOLUTE MAXIMUM RATINGS
VDD to SGND............................................................-0.3V to +4V
VIDIN to SGND .........................................................-0.3V to +4V
BIAS to SGND ............................................-0.3V to (VDD + 0.3V)
SHDN to SGND ........................................................-0.3V to +4V
VIDOUT to SGND........................(The greater of VSS and -2V) to
(VDD + 0.3V)
CPVDD to CPGND ....................................................-0.3V to +4V
C1P, C1N, CPVSS .............................Capacitor Connection Only
CPGND, SGND, GND............................................-0.1V to +0.1V
CPVSS to VSS ..................................................................-0.1V to +0.1V
VIDOUT Short Circuit to VDD, SGND
and the Greater of (VSS and -2V) ...........................Continuous
Continuous Current
VIDIN, BIAS, SHDN ......................................................±20mA
Continuous Power Dissipation (TA = +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
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 = CPVDD = SHDN = 3.0V, SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, RBIAS = 100kΩ, TA = TMIN to TMAX.
RL = 150Ω to SGND, unless otherwise noted. VVIDIN = 286mV (MAX9503G), VVIDIN = 143mV (MAX9503M). Typical values are at
VDD = CPVDD = SHDN = 3.0V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage Range
SYMBOL
VDD,
CPVDD
Quiescent Supply Current
IDD
Shutdown Supply Current
ISHDN
Bias Voltage
VBIAS
CONDITIONS
Guaranteed by DC voltage gain and
quiescent current
MIN
TYP
MAX
UNITS
3.6
V
12
15
mA
0.01
1
µA
2.7
VDD = 3.6V (IDD = IVDD + ICPVDD, RL = ∞)
VDD = 3.6V (ISHDN = IVDD + ICPVDD),
SHDN = SGND
1
V
VIDEO AMPLIFIER
Input Voltage Range
VRANGE
Input Current
IIN
Input Resistance
RIN
DC Voltage Gain (Note 2)
AV
Output Black Level (Note 3)
Output Resistance
Shutdown Output Impedance
2
MAX9503G
-0.10
+1.05
MAX9503M
-0.050
+0.525
Guaranteed by DC
voltage gain, VDD = 3V
MAX9503G
-0.10
+1.28
MAX9503M
-0.05
+0.64
VDD = 2.7V
ISC
ROUT
-2.5
+2.5
1
VDD = 2.7V to 3.6V
VDD = 2.7V
Output Voltage Swing
Output Short-Circuit Current
Guaranteed by DC
voltage gain, VDD = 2.7V
5.5
6
6.5
MAX9503M
11.5
12
12.5
MAX9503G
-0.1
0
+0.1
MAX9503M
-0.15
0
+0.15
2.162
Guaranteed by DC voltage gain, VDD = 3V
2.594
Sinking or sourcing
dB
V
VP-P
50
MAX9503G
0.01
MAX9503M
0.02
ROUTSHDN SHDN = SGND
µA
MΩ
MAX9503G
Guaranteed by DC voltage gain, VDD = 2.7V
V
MAX9503G
4.2
MAX9503M
8.2
_______________________________________________________________________________________
mA
Ω
kΩ
DirectDrive Video Amplifier with
Reconstruction Filter
(VDD = CPVDD = SHDN = 3.0V, SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, RBIAS = 100kΩ, TA = TMIN to TMAX.
RL = 150Ω to SGND, unless otherwise noted. VVIDIN = 286mV (MAX9503G), VVIDIN = 143mV (MAX9503M). Typical values are at
VDD = CPVDD = SHDN = 3.0V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
150
250
300
kHz
0.5
V
1
µA
CHARGE PUMP
Switching Frequency
LOGIC SIGNALS
Logic-Low Threshold
VIL
VDD = 2.7V to 3.6V
Logic-High Threshold
VIH
VDD = 2.7V to 3.6V
Logic Input Current
IIL
1.5
V
AC ELECTRICAL CHARACTERISTICS
(VDD = CPVDD = SHDN = 3.0V, SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, RBIAS = 100kΩ, TA = TMIN to TMAX. RL =
150Ω to SGND, unless otherwise noted. VVIDIN = 286mV (MAX9503G), VVIDIN = 143mV (MAX9503M). Typical values are at VDD =
CPVDD = SHDN = 3.0V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Passband Flatness
VDD = 2.7V, f = 100kHz to 5.5MHz
Attenuation
VDD = 2.7V,
VIDOUT= 2VP-P, attenuation
is referred to 100kHz
Power-Supply Rejection Ratio
PSRR
f = 100kHz
Output Impedance
ZOUT
f = 5MHz
Differential Gain Error
DG
NTSC, VIDOUT = 2VP-P
Differential Phase Error
DP
NTSC, VIDOUT = 2VP-P
MIN
TYP
MAX
UNITS
-1
0
+1
dB
f = 9.1MHz
3
dB
f = 27MHz
35
50
MAX9503G
62
MAX9503M
56
MAX9503G
0.5
MAX9503M
0.65
MAX9503G
0.1
MAX9503M
0.1
MAX9503G
0.2
MAX9503M
0.2
dB
Ω
%
Degrees
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
-0.3
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
DDt
100kHz to 5.5MHz
10
ns
VIDOUT Capacitive-Load Stability
CL
VOUT = 2VP-P, no sustained oscillations
20
pF
_______________________________________________________________________________________
3
MAX9503
ELECTRICAL CHARACTERISTICS (continued)
AC ELECTRICAL CHARACTERISTICS (continued)
(VDD = CPVDD = SHDN = 3.0V, SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, RBIAS = 100kΩ, TA = TMIN to TMAX. RL =
150Ω to SGND, unless otherwise noted. VVIDIN = 286mV (MAX9503G), VVIDIN = 143mV (MAX9503M). Typical values are at VDD =
CPVDD = SHDN = 3.0V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Peak Signal-to-RMS Noise
SNR
100kHz to 5.5MHz
MAX9503G
64
MAX9503M
58
Enable Time
tON
VIDIN = 0.5V, VIDOUT settled to within 1%
of the final voltage
0.2
ms
Disable Time
tOFF
VIDIN = 0.5V, VIDOUT settled to below 1%
of the output voltage
0.1
ms
dB
Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.
Note 2: Voltage gain (AV) 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.
Typical Operating Characteristics
(VDD = CPVDD = SHDN = 3.0V, SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1µF, RBIAS = 100kΩ, TA = TMIN to
TMAX. RIN = 150Ω to SGND, unless otherwise noted. VVIDIN = 286mV (MAX9503G), VVIDIN = 143mV (MAX9503M). Typical values
are at TA = +25°C, unless otherwise noted.)
0
-20
-20
GAIN (dB)
-10
-30
-40
-50
-30
-40
-50
-60
-60
VVIDOUT = 100mVP-P
GAIN = 6dB
-70
1
10
FREQUENCY (MHz)
100
7
6
5
4
-80
0.1
VVIDOUT = 100mVP-P
GAIN = 6dB
VVIDOUT = 100mVP-P
GAIN = 12dB
-70
-80
8
GAIN FLATNESS (dB)
0
10
-10
MAX9503G SMALL-SIGNAL
GAIN FLATNESS vs. FREQUENCY
MAX9503 toc02
10
4
20
MAX9503 toc01
20
MAX9503M
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX9503 toc03
MAX9503G
SMALL-SIGNAL GAIN vs. FREQUENCY
GAIN (dB)
MAX9503
DirectDrive Video Amplifier with
Reconstruction Filter
3
0.1
1
10
FREQUENCY (MHz)
100
0.1
1
FREQUENCY (MHz)
_______________________________________________________________________________________
10
DirectDrive Video Amplifier with
Reconstruction Filter
(VDD = CPVDD = SHDN = 3.0V, SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1µF, RBIAS = 100kΩ, TA = TMIN to
TMAX. RIN = 150Ω to SGND, unless otherwise noted. VVIDIN = 286mV (MAX9503G), VVIDIN = 143mV (MAX9503M). Typical values
are at TA = +25°C, unless otherwise noted.)
MAX9503G
LARGE-SIGNAL GAIN vs. FREQUENCY
0
11
-10
-20
-20
-30
-40
-80
0.1
1
100
10
0.1
1
FREQUENCY (MHz)
FREQUENCY (MHz)
14
VVIDOUT = 2VP-P
GAIN = 12dB
13
GAIN FLATNESS (dB)
7
6
5
MAX9503 toc08
VVIDOUT = 2VP-P
GAIN = 6dB
100
MAX9503M LARGE-SIGNAL
GAIN FLATNESS vs. FREQUENCY
MAX9503 toc07
8
10
FREQUENCY (MHz)
MAX9503G LARGE-SIGNAL
GAIN FLATNESS vs. FREQUENCY
4
12
11
10
3
9
0.1
10
1
0.1
FREQUENCY (MHz)
MAX9503G GROUP DELAY
MAX9503M GROUP DELAY
150
MAX9503 toc09
150
VVIDOUT = 2VP-P
VVIDOUT = 2VP-P
125
GROUP DELAY (ns)
125
10
1
FREQUENCY (Hz)
100
75
50
25
MAX9503 toc10
GAIN FLATNESS (dB)
VVIDOUT = 2VP-P
GAIN = 12dB
-70
-80
10
1
-40
-60
VVIDOUT = 2VP-P
GAIN = 6dB
-70
0.1
-30
-50
-60
9
0
-10
-50
10
10
GAIN (dB)
GAIN (dB)
12
GROUP DELAY (ns)
GAIN FLATNESS (dB)
10
13
20
MAX9503 toc05
VVIDOUT = 100mVP-P
GAIN = 12dB
14
20
MAX9503 toc04
15
MAX9503M
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX9503 toc06
MAX9503M SMALL-SIGNAL
GAIN FLATNESS vs. FREQUENCY
100
75
50
25
0
0
0.1
1
10
FREQUENCY (MHz)
100
0.1
1
10
100
FREQUENCY (MHz)
_______________________________________________________________________________________
5
MAX9503
Typical Operating Characteristics (continued)
Typical Operating Characteristics (continued)
(VDD = CPVDD = SHDN = 3.0V, SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1µF, RBIAS = 100kΩ, TA = TMIN to
TMAX. RIN = 150Ω to SGND, unless otherwise noted. VVIDIN = 286mV (MAX9503G), VVIDIN = 143mV (MAX9503M). Typical values
are at TA = +25°C, unless otherwise noted.)
-20
PSRR (dB)
-40
-60
-40
-60
-80
-80
-100
-100
-120
-120
0.01
0.1
10
1
0.1
10
1
-40
-15
10
60
TEMPERATURE (°C)
MAX9503G VOLTAGE GAIN
vs. TEMPERATURE
MAX9503M VOLTAGE GAIN
vs. TEMPERATURE
MAX9503G OUTPUT VOLTAGE
vs. INPUT VOLTAGE
12.2
4
3
OUTPUT VOLTAGE (V)
6.0
12.1
12.0
11.9
11.7
-15
10
35
85
60
2
1
0
11.8
5.8
-1
-40
-15
10
35
60
85
-0.2
0.3
0.8
1.3
1.8
2.3
MAX9503 toc17
3
2
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
1
1
0
-1
-2
0
0.2
0.4
0.6
0.8
1.0
1.2
1
2
2
3
3
4
4
5
5
6
6
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
2.8
MAX9503 toc19
MAX9503M
DIFFERENTIAL GAIN AND PHASE
DIFFERENTIAL GAIN (%)
MAX9503G
DIFFERENTIAL GAIN AND PHASE
DIFFERENTIAL PHASE (deg)
MAX9503M OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX9503 toc18
INPUT VOLTAGE (V)
DIFFERENTIAL GAIN (%)
TEMPERATURE (°C)
DIFFERENTIAL PHASE (deg)
TEMPERATURE (°C)
4
85
MAX9503 toc16
MAX9503 toc14
12.3
5.9
1
2
3
4
5
6
1
2
3
4
5
6
INPUT VOLTAGE (V)
6
35
FREQUENCY (MHz)
VOLTAGE GAIN (dB)
VOLTAGE GAIN (dB)
MAX9503G
10
0.01
6.1
-0.2
MAX9503M
12
FREQUENCY (MHz)
6.2
-40
13
11
MAX9503 toc15
PSRR (dB)
SUPPLY CURRENT (mA)
0
-20
14
MAX9503 toc12
0
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
20
MAX9503 toc11
20
MAX9503M POWER-SUPPLY
REJECTION RATIO vs. FREQUENCY
MAX9503 toc13
MAX9503G POWER-SUPPLY
REJECTION RATIO vs. FREQUENCY
OUTPUT VOLTAGE (V)
MAX9503
DirectDrive Video Amplifier with
Reconstruction Filter
_______________________________________________________________________________________
DirectDrive Video Amplifier with
Reconstruction Filter
(VDD = CPVDD = SHDN = 3.0V, SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1µF, RBIAS = 100kΩ, TA = TMIN to
TMAX. RIN = 150Ω to SGND, unless otherwise noted. VVIDIN = 286mV (MAX9503G), VVIDIN = 143mV (MAX9503M). Typical values
are at TA = +25°C, unless otherwise noted.)
MAX9503G 2T RESPONSE
MAX9503M 2T RESPONSE
MAX9503 toc20
MAX9503G 12.5T RESPONSE
MAX9503 toc21
VIDIN
200mV/div
MAX9503 toc22
VIDIN
100mV/div
VIDIN
250mV/div
300mV
VIDOUT
400mV/div
VIDOUT
400mV/div
VIDOUT
500mV/div
0V
100ns/div
400ns/div
100ns/div
MAX9503G OUT RESPONSE
TO NTC-7 VIDEO TEST SIGNAL
MAX9503M 12.5T RESPONSE
MAX9503 toc23
MAX9503M OUT RESPONSE
TO NTC-7 VIDEO TEST SIGNAL
MAX9503 toc24
VIDIN
100mV/div
MAX9503 toc25
VIDIN
500mV/div
VIDIN
250mV/div
0V
0V
VIDOUT
1V/div
0V
VIDOUT
1V/div
0V
150mV
VIDOUT
400mV/div
0V
400ns/div
10μs/div
10μs/div
MAX9503G OUT RESPONSE TO BLACKTO-WHITE VIDEO TEST SIGNAL
MAX9503M OUT RESPONSE TO BLACKTO-WHITE VIDEO TEST SIGNAL
MAX9503 toc26
MAX9503 toc27
VIDIN
500mV/div
0V
VIDIN
250mV/div
0V
VIDOUT
1V/div
0V
2ms/div
VIDOUT
1V/div
0V
2ms/div
_______________________________________________________________________________________
7
MAX9503
Typical Operating Characteristics (continued)
DirectDrive Video Amplifier with
Reconstruction Filter
MAX9503
Pin Description
PIN
NAME
QSOP
TQFN
1
15
VSS
2
16
CPVSS
3
1
C1N
4
2
CPGND
5
3
C1P
6
4
CPVDD
7
5
BIAS
8
6
SGND
FUNCTION
Negative Power Supply. Connect to CPVSS.
Charge-Pump Negative Power Supply. Bypass with a 1µF capacitor to CPGND.
Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor from C1P to C1N.
Charge-Pump Power Ground
Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor from C1P to C1N.
Charge-Pump Positive Power Supply. Bypass with a 1µF capacitor to CPGND.
Common-Mode Voltage. Connect a 100kΩ resistor from BIAS to SGND.
Signal Ground. Connect to GND.
9
7
VIDIN
10, 14, 15
8, 12, 14
N.C.
No Connection. Not internally connected. Connect to SGND.
Video Input
11
9
SHDN
Active-Low Shutdown. Connect to VDD for normal operation.
12
10
GND
Ground. Connect to SGND.
13
11
VDD
Positive Power Supply. Bypass with a 1µF capacitor to SGND.
16
13
VIDOUT
—
EP
EP
Video Output
Exposed Paddle. Connect to GND.
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.
8
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
MAX9503
INPUT
500mV/div
INPUT
500mV/div
0V
OUTPUT
500mV/div
2ms/div
Figure 1. AC-Coupled Output
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.
0V
OUTPUT
1V/div
2ms/div
Figure 2. DirectDrive Output
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.
_______________________________________________________________________________________
9
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 (CPV DD)
with a 1µF capacitor to CPGND, placed as close to the
device as possible. Connect CPVSS to VSS and bypass
with a 1µF capacitor to CPGND as close to the device
as possible.
VIDOUT
VDD
GND
SHDN
TOP VIEW
N.C.
Pin Configurations
12
11
10
9
13
VSS 1
8
N.C.
16 VIDOUT
CPVSS 2
15 N.C.
C1N 3
N.C.
14
7
VIDIN
MAX9503
VSS
15
6
SGND
CPVSS
16
5
BIAS
14 N.C.
MAX9503
CPGND 4
13 VDD
C1P 5
12 GND
CPVDD 6
4
CPVDD
3
C1P
2
CPGND
1
C1N
MAX9503
DirectDrive Video Amplifier with
Reconstruction Filter
11 SHDN
BIAS 7
10 N.C.
SGND 8
9
VIDIN
QSOP
3mm x 3mm TQFN
10
______________________________________________________________________________________
DirectDrive Video Amplifier with
Reconstruction Filter
BIAS
1V
100kΩ
MAX9503G
(MAX9503M)
VDD
SHDN
VDD
SHUTDOWN
CIRCUIT
6dB
(12dB)
VIDEO
ASIC
BUFFER
VIDIN
DAC
SGND
1μF
RECONSTRUCTION
FILTER
AMP
GND
75Ω
75Ω
DC
LEVEL SHIFT
VDD
VIDOUT
LINEAR
REGULATOR
CPVDD
CHARGE PUMP
C3
1μF
CPGND C1P
C1N
CPVSS
VSS
C1
1μF
C2
1μF
Chip Information
PROCESS: BiCMOS
______________________________________________________________________________________
11
MAX9503
Functional Diagram/Typical Operating Circuit
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
12
______________________________________________________________________________________
DirectDrive Video Amplifier with
Reconstruction Filter
12x16L QFN THIN.EPS
(NE - 1) X e
E
MARKING
E/2
D2/2
(ND - 1) X e
AAAA
D/2
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
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
0.75
0.45
0.55
0.65
0.30
0.40
N
8
12
16
ND
2
3
4
2
NE
0
A1
A2
k
0.02
3
0.05
0
0.20 REF
0.25
-
0.02
-
0.25
-
0.50
0.05
0
0.02
0.05
0.20 REF
-
0.25
-
PKG.
CODES
D2
2
E2
PIN ID
JEDEC
MIN.
NOM.
MAX.
MIN.
NOM.
MAX.
TQ833-1
0.25
0.70
1.25
0.25
0.70
1.25
0.35 x 45°
T1233-1
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-1
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
4
0.20 REF
1
EXPOSED PAD VARIATIONS
0.50 BSC.
0.50 BSC.
I
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEEC
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
I
2
2
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.
MAX9503
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.)
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