19-3675; Rev 1; 8/05
DirectDrive Video Amplifier with
Reconstruction Filter and Analog Switch
General Description
The MAX9505 filters and amplifies standard-definition
video signals. Maxim’s DirectDrive™ technology elimi-
nates large output-coupling capacitors and sets the
video black level to ground. An internal reconstruction
filter smoothes the steps and reduces the spikes on the
video signal from the video digital-to-analog converter
(DAC). The input of the MAX9505 can be directly con-
nected to the output of a DAC. The MAX9505 provides
a compact, integrated, and low-power solution.
The reconstruction filter typically has 3dB attenuation at
9MHz and 50dB attenuation at 27MHz, and ±1dB pass-
band flatness to 5.5MHz.
Maxim’s DirectDrive uses an integrated charge pump
and a linear regulator to create a negative power supply
to drive the sync below ground. The charge pump injects
so little noise into the video output that the picture is visi-
bly flawless.
The MAX9505 features an internal 1.7Ω analog switch
that interfaces with a 4-pole multimedia jack. This
switch allows one of the poles to be set as a video
input, a video output, or a microphone input.
The MAX9505 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.
♦
DC-Coupled Output
♦
Direct Connection to Video DAC
♦
Video Output Black Level Set to Ground
♦
Video Reconstruction Filter with 50dB
Attenuation at 27MHz
♦
6dB Gain
♦
1.7Ω R
ON
Analog Switch
♦
10nA Shutdown Supply Current
♦
2.7V to 3.6V Single-Supply Operation
Features
MAX9505
Ordering Information
PART*
MAX9505EEE
MAX9505ETE
PIN-
PACKAGE
16 QSOP
16 TQFN
PKG CODE
E16-4
T1633-4
TOP MARK
—
ACW
*All
devices are specified over the -40°C to +85°C operating
temperature range.
Applications
Mobile Phones/Smartphones
Space-Constrained, Low-Power Audio/Video
Portable Devices
Functional Diagram/Typical Operating Circuit and Pin
Configurations appear at end of data sheet.
Block Diagram
MAX9505
0 TO 50mV
0V
VIDIN
S
OUT
BUFFER
LOWPASS
FILTER
6dB
AMP
LINEAR
REGULATOR
CHARGE
PUMP
VIDOUT
S
IN
0V
-0.1V TO
+0.1V
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
DirectDrive Video Amplifier with
Reconstruction Filter and Analog Switch
MAX9505
ABSOLUTE MAXIMUM RATINGS
V
DD
to SGND............................................................-0.3V to +4V
VIDIN to SGND .........................................................-0.3V to +4V
BIAS to SGND ............................................-0.3V to (V
DD
+ 0.3V)
MODE0, MODE1 to SGND .......................................-0.3V to +4V
(The greater of V
SS
and -2V)
S
IN
, S
OUT
, VIDOUT to SGND
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, MODE0, MODE1, S
IN
, S
OUT
...................±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
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DD
= CPV
DD
= MODE1 = 3.0V, MODE0 = SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, R
BIAS
= 100kΩ, T
A
= T
MIN
to
T
MAX
. R
L
= 150Ω to SGND, unless otherwise noted. V
VIDIN
= 286mV, gain = 6dB. Typical values are at V
DD
= CPV
DD
= MODE1 = 3.0V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage Range
Quiescent Supply Current
Shutdown Supply Current
Bias Voltage
VIDEO AMPLIFIER
Input Voltage Range
Input Current
Input Resistance
DC Voltage Gain (Note 2)
Output Black Level (Note 3)
Output Voltage Swing
Output Short-Circuit Current
Output Resistance
Shutdown Output Impedance
VIDOUT Leakage Current
I
SC
R
OUT
MODE1 = MODE0 = SGND
MODE1 = MODE0 = V
DD
MODE1 = SGND and MODE0 = V
DD
V
RANGE
I
IN
R
IN
A
V
V
DD
= 2.7V to 3.6V
V
DD
= 2.7V
Guaranteed by DC voltage gain, V
DD
= 2.7V
Guaranteed by DC voltage gain, V
DD
= 3V
Sinking or sourcing
5.5
-0.1
2.162
2.594
50
0.01
4
0.01
0.01
Guaranteed by DC voltage gain,
V
DD
= 2.7V
Guaranteed by DC voltage gain, V
DD
= 3V
V
DD
= 2.7V
-0.10
-0.10
-2.5
1
6
0
6.5
+0.1
+1.05
+1.28
+2.5
µA
MΩ
dB
V
V
P-P
mA
Ω
kΩ
µA
V
SYMBOL
V
DD
,
CPV
DD
I
DD
I
SHDN
V
BIAS
CONDITIONS
Guaranteed by DC voltage gain and
quiescent supply current
V
DD
= 3.6V (I
DD
= I
VDD
+ I
CPVDD
, R
L
=
∞)
V
DD
= 3.6V (I
SHDN
= I
VDD
+ I
CPVDD
),
SHDN
= SGND
MIN
2.7
12
0.01
1
TYP
MAX
3.6
15
1
UNITS
V
mA
µA
V
2
_______________________________________________________________________________________
DirectDrive Video Amplifier with
Reconstruction Filter and Analog Switch
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= CPV
DD
= MODE1 = 3.0V, MODE0 = SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, R
BIAS
= 100kΩ, T
A
= T
MIN
to
T
MAX
. R
L
= 150Ω to SGND, unless otherwise noted. V
VIDIN
= 286mV, gain = 6dB. Typical values are at V
DD
= CPV
DD
= MODE1 = 3.0V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
ANALOG SWITCH
On-Resistance
On-Resistance Flatness (Note 4)
S
OUT
Off-Leakage Current
(Note 5)
S
IN
On-Leakage Current (Note 5)
Turn-On Time
Turn-Off Time
Charge Injection
R
ON
MODE0 = V
DD
,
I
SIN
= 10mA
MODE0 = V
DD
,
I
SIN
= 10mA, V
DD
= 3V
MODE1 = V
DD
MODE1 = SGND
MODE1 = V
DD
MODE1 = SGND
-1
-1
35
50
20
30
dB
50
200
0.025
18
60
MHz
%
pF
pF
1.7
1.2
0.5
0.3
4.4
2.5
0.9
0.5
+1
+1
60
80
Ω
Ω
nA
nA
ns
ns
pC
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9505
MODE0 = SGND, V
DD
= 3.6V, V
SIN
= 0.3V,
3.3V, V
SOUT
= 3.3V, 0.3V
MODE0 = V
DD
, V
DD
= 3.6V, V
SIN
= 0.3V,
3.3V, V
SOUT
= 3.3V, 0.3V
V
SIN
= 1.5V, R
L
= 300Ω, C
L
= 35pF,
Figure 1; V
IH
= 1.5V, V
IL
= 0V
V
SIN
= 1.5V; R
L
= 300Ω, C
L
= 35pF,
Figure 1; V
IH
= 1.5V, V
IL
= 0V
V
GEN
= 1.5V, R
GEN
= 0Ω, C
L
= 1nF,
Figure 2
MODE0 = SGND, f = 10MHz;
V
SOUT
= 1V
P-P
, R
L
= 50Ω, C
L
= 5pF
MODE0 = SGND, f = 1MHz; V
SOUT
= 1V
P-P
,
R
L
= 50Ω, C
L
= 5pF
MODE0 = V
DD
, signal = 0dBm, R
L
= 50Ω,
C
L
= 5pF
MODE0 = V
DD
, V
SIN
= 2V
P-P
, R
L
= 600Ω
MODE0 = SGND, f = 1MHz
MODE0 = V
DD
, f = 1MHz
MODE1 = MODE0 = V
DD
, f = 20kHz,
1V
P-P
at VIDIN
MODE1 = V
DD
, MODE0 = SGND,
f = 20kHz, 2V
P-P
at VIDOUT
Off-Isolation
On-Channel -3dB Bandwidth
Total Harmonic Distortion
S
OUT
Off-Capacitance
Switch On-Capacitance
CROSSTALK (VIDEO TO AUDIO)
VIDIN to S
IN
VIDOUT to S
IN
CHARGE PUMP
Switching Frequency
LOGIC SIGNALS (MODE0, MODE1)
Logic-Low Threshold
Logic-High Threshold
Logic Input Current
V
IL
V
IH
I
IL
100
85
dB
dB
150
V
DD
= 2.7V to 3.6V
V
DD
= 2.7V to 3.6V
1.5
250
300
0.5
1
kHz
V
V
µA
_______________________________________________________________________________________
3
DirectDrive Video Amplifier with
Reconstruction Filter and Analog Switch
MAX9505
AC ELECTRICAL CHARACTERISTICS
(V
DD
= CPV
DD
= MODE1 = 3.0V, MODE0 = SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1µF, R
BIAS
= 100kΩ, T
A
= T
MIN
to
T
MAX
. R
L
= 150Ω to SGND, unless otherwise noted. V
VIDIN
= 286mV, gain = 6dB. Typical values are at V
DD
= CPV
DD
= MODE1 = 3.0V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Passband Flatness
Attenuation
Power-Supply Rejection Ratio
Output Impedance
Differential Gain Error
Differential Phase Error
2T Pulse-to-Bar K Rating
2T Pulse Response
2T Bar Response
Nonlinearity
Group Delay Distortion
VIDOUT Capacitive-Load Stability
Peak Signal-to-RMS Noise
Enable Time
Disable Time
D
Dt
C
L
SNR
t
ON
t
OFF
PSRR
Z
OUT
DG
DP
SYMBOL
CONDITIONS
V
DD
= 2.7V, f = 100kHz to 5.5MHz
V
DD
= 2.7V,
VIDOUT= 2V
P-P
, attenuation
is referred to 100kHz
f = 100kHz
f = 5MHz
NTSC, VIDOUT = 2V
P-P
NTSC, VIDOUT = 2V
P-P
2T = 250ns, bar time is 18µs, the beginning
2.5% and the ending 2.5% of the bar time
are ignored
2T = 250ns
2T = 250ns, bar time is 18µs, the beginning
2.5% and the ending 2.5% of the bar time
are ignored
5-step staircase
100kHz to 5.5MHz
V
OUT
= 2V
P-P
, no sustained oscillations
100kHz to 5.5MHz
VIDIN = 0.5V, VIDOUT settled to within 1%
of the final voltage
VIDIN = 0.5V, VIDOUT settled to below 1%
of the output voltage
f = 9.1MHz
f = 27MHz
35
MIN
-1
TYP
0
3
dB
50
62
0.5
0.1
0.2
-0.3
0.3
0.7
0.2
10
20
64
0.2
0.1
dB
Ω
%
degrees
K%
K%
K%
%
ns
pF
dB
ms
ms
MAX
+1
UNITS
dB
All devices are 100% production tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Voltage gain (A
V
) is a two-point measurement in which the output voltage swing is divided by the input voltage swing.
With an output load attached, this offset will directly contribute to quiescent current.
Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal ranges.
Note 5:
Guaranteed by design.
Note 1:
Note 2:
Note 3:
Note 4:
4
_______________________________________________________________________________________
DirectDrive Video Amplifier with
Reconstruction Filter and Analog Switch
Timing Diagrams
MAX9505
V
DD
V
IH
V
DD
V
NO
S
OUT
S
IN
C
L
V
OUT
SWITCH OUTPUT
LOGIC
INPUT
0V
SGND
t
ON
0.9 x V
OUT
V
OUT
R
L
MODE0
V
IL
t
OFF
0.9 x V
OUT
50%
t
R
< 5ns
t
F
< 5ns
MODE0
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
V
OUT
= V
NO
(R
L
/ (R
L
+ R
ON
))
Figure 1. Analog Switch Turn-On/Off Time
V
DD
V
DD
R
GEN
V
GEN
S
OUT
S
IN
C
L
V
OUT
V
OUT
∆V
OUT
ON
SGND
MODE0
IN
V
IL
TO V
IH
IN
OFF
Q = (∆V
OUT
) (C
L
)
OFF
Figure 2. Charge Injection
_______________________________________________________________________________________
5
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