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19-3675; Rev 0; 5/05
DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch
General Description
The MAX9505 filters and amplifies standard-definition video signals. Maxim's DirectDriveTM technology eliminates 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 connected 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 passband 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 visibly flawless. The MAX9505 features an internal 1.7 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 -40C to +85C 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 1.7 RON Analog Switch 10nA Shutdown Supply Current 2.7V to 3.6V Single-Supply Operation
Features
MAX9505
Ordering Information
PART* MAX9505EEE MAX9505ETE PINPACKAGE 16 QSOP 16 TQFN PKG CODE E16-4 T1633-4 TOP MARK -- ACW
*All devices are specified over the -40C to +85C 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 SOUT BUFFER LOWPASS FILTER 6dB AMP LINEAR REGULATOR CHARGE PUMP VIDOUT SIN 0V -0.1V TO +0.1V
________________________________________________________________ Maxim Integrated Products
1
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch MAX9505
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) MODE0, MODE1 to SGND .......................................-0.3V to +4V (The greater of VSS and -2V) SIN, SOUT, VIDOUT to SGND 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, MODE0, MODE1, SIN, SOUT ...................20mA Continuous Power Dissipation (TA = +70C) 16-Pin QSOP (derate 8.3mW/C above +70C)...........667mW 16-Pin TQFN (derate 15.6mW/C above +70C) .......1349mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = MODE1 = 3.0V, MODE0 = SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1F, RBIAS = 100k, TA = TMIN to TMAX. RL = 150 to SGND, unless otherwise noted. VVIDIN = 286mV, gain = 6dB. Typical values are at VDD = CPVDD = MODE1 = 3.0V, TA = +25C, 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 Short-Circuit Current Output Resistance Shutdown Output Impedance VIDOUT Leakage Current ISC ROUT MODE1 = MODE0 = SGND MODE1 = MODE0 = VDD MODE1 = SGND and MODE0 = VDD VRANGE IIN RIN AV VDD = 2.7V to 3.6V VDD = 2.7V Sinking or sourcing 5.5 -0.1 Guaranteed by DC voltage gain, VDD = 2.7V Guaranteed by DC voltage gain, VDD = 3V VDD = 2.7V -0.10 -0.10 -2.5 1 6 0 50 0.01 4 0.01 0.01 6.5 +0.1 +1.05 +1.28 +2.5 A M dB V mA k A V SYMBOL VDD, CPVDD IDD ISHDN VBIAS CONDITIONS Guaranteed by DC voltage gain and quiescent supply current VDD = 3.6V (IDD = IVDD + ICPVDD, RL = ) VDD = 3.6V (ISHDN = IVDD + ICPVDD), SHDN = SGND MIN 2.7 12 0.01 1 TYP MAX 3.6 15 1 UNITS V mA A V
2
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch
ELECTRICAL CHARACTERISTICS (continued)
(VDD = CPVDD = MODE1 = 3.0V, MODE0 = SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1F, RBIAS = 100k, TA = TMIN to TMAX. RL = 150 to SGND, unless otherwise noted. VVIDIN = 286mV, gain = 6dB. Typical values are at VDD = CPVDD = MODE1 = 3.0V, TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER ANALOG SWITCH On-Resistance On-Resistance Flatness (Note 4) SOUT Off-Leakage Current (Note 5) SIN On-Leakage Current (Note 5) Turn-On Time Turn-Off Time Charge Injection RON MODE0 = VDD, ISIN = 10mA MODE0 = VDD, ISIN = 10mA, VDD = 3V MODE1 = VDD MODE1 = SGND MODE1 = VDD 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 nA nA ns ns pC SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX9505
MODE0 = SGND, VDD = 3.6V, VSIN = 0.3V, 3.3V, VSOUT = 3.3V, 0.3V MODE0 = VDD, VDD = 3.6V, VSIN = 0.3V, 3.3V, VSOUT = 3.3V, 0.3V VSIN = 1.5V, RL = 300, CL = 35pF, Figure 1; VIH = 1.5V, VIL = 0V VSIN = 1.5V; RL = 300, CL = 35pF, Figure 1; VIH = 1.5V, VIL = 0V VGEN = 1.5V, RGEN = 0, CL = 1nF, Figure 2 MODE0 = SGND, f = 10MHz; VSOUT = 1VP-P, RL = 50, CL = 5pF MODE0 = SGND, f = 1MHz; VSOUT = 1VP-P, RL = 50, CL = 5pF MODE0 = VDD, signal = 0dBm, RL = 50, CL = 5pF MODE0 = VDD, VSIN = 2VP-P, RL = 600 MODE0 = SGND, f = 1MHz MODE0 = VDD, f = 1MHz MODE1 = MODE0 = VDD, f = 20kHz, 1VP-P at VIDIN MODE1 = VDD, MODE0 = SGND, f = 20kHz, 2VP-P at VIDOUT
Off-Isolation
On-Channel -3dB Bandwidth Total Harmonic Distortion SOUT Off-Capacitance Switch On-Capacitance CROSSTALK (VIDEO TO AUDIO) VIDIN to SIN VIDOUT to SIN CHARGE PUMP Switching Frequency LOGIC SIGNALS (MODE0, MODE1) Logic-Low Threshold Logic-High Threshold Logic Input Current VIL VIH IIL
100 85
dB dB
150 VDD = 2.7V to 3.6V VDD = 2.7V to 3.6V 1.5
250
300 0.5 1
kHz V V A
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch MAX9505
AC ELECTRICAL CHARACTERISTICS
(VDD = CPVDD = MODE1 = 3.0V, MODE0 = SGND = GND = CPGND = 0V, C1 = C2 = C3 = C4 = 1F, RBIAS = 100k, TA = TMIN to TMAX. RL = 150 to SGND, unless otherwise noted. VVIDIN = 286mV, gain = 6dB. Typical values are at VDD = CPVDD = MODE1 = 3.0V, TA = +25C, 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 DDt CL SNR tON tOFF PSRR ZOUT DG DP SYMBOL CONDITIONS VDD = 2.7V, f = 100kHz to 5.5MHz VDD = 2.7V, VIDOUT= 2VP-P, attenuation is referred to 100kHz f = 100kHz f = 5MHz NTSC, VIDOUT = 2VP-P NTSC, VIDOUT = 2VP-P 2T = 250ns, bar time is 18s, the beginning 2.5% and the ending 2.5% of the bar time are ignored 2T = 250ns 2T = 250ns, bar time is 18s, the beginning 2.5% and the ending 2.5% of the bar time are ignored 5-step staircase 100kHz to 5.5MHz VOUT = 2VP-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 % degrees K% K% K% % ns pF dB ms ms MAX +1 UNITS dB
Note 1: Note 2: Note 3: Note 4:
All devices are 100% production tested at TA = +25C. Specifications over temperature are guaranteed by design. Voltage gain (AV) 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.
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch
Timing Diagrams
MAX9505
VDD VIH VDD VNO SOUT SIN CL VOUT SWITCH OUTPUT LOGIC INPUT 0V SGND tON 0.9 x VOUT VOUT RL MODE0 VIL tOFF 0.9 x VOUT 50% tR < 5ns tF < 5ns
MODE0
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. VOUT = VNO (RL / (RL + RON))
Figure 1. Analog Switch Turn-On/Off Time
VDD VDD RGEN VGEN SOUT SIN CL VOUT VOUT
VOUT
ON SGND MODE0 IN VIL TO VIH IN OFF Q = (VOUT) (CL) OFF
Figure 2. Charge Injection
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch MAX9505
Typical Operating Characteristics
(VDD = CPVDD = MODE1 = 3.0V, MODE0 = SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1F, RBIAS = 100k, TA = TMIN to TMAX. RIN = 150 to SGND, unless otherwise noted. VVIDIN = 286mV, gain = 6dB. Typical values are at TA = +25C, unless otherwise noted.)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX9505 toc01
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
VVIDOUT = 100mVP-P GAIN = 6dB 7 GAIN FLATNESS (dB)
MAX9505 toc02
LARGE-SIGNAL GAIN vs. FREQUENCY
10 0 -10 GAIN (dB)
MAX9505 toc03
20 10 0 -10 GAIN (dB) -20 -30 -40 -50 -60 -70 -80 0.1 1 10 VVIDOUT = 100mVP-P GAIN = 6dB
8
20
6
-20 -30 -40 -50
5
4
-60 -70 VVIDOUT = 2VP-P GAIN = 6dB 0.1 1 10 100
3 100 0.1 1 FREQUENCY (MHz) 10 FREQUENCY (MHz)
-80 FREQUENCY (MHz)
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9505 toc04
GROUP DELAY
MAX9505 toc05
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX9505 toc06
8 VVIDOUT = 2VP-P GAIN = 6dB 7 GAIN FLATNESS (dB)
150 VVIDOUT = 2VP-P 125 GROUP DELAY (ns) 100
20 0 -20 PSRR (dB) -40 -60 -80
6
75 50 25 0
5
4
-100 -120 0.1 1 10 100 0.01 0.1 1 10 FREQUENCY (MHz) FREQUENCY (MHz)
3 0.1 1 FREQUENCY (MHz) 10
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE (VIDEO MODE)
MODE0 = SGND, MODE1 = VDD
MAX9505 toc07
VOLTAGE GAIN vs. TEMPERATURE
MAX9505 toc08
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX9505 toc09
14
6.2
4
SUPPLY CURRENT (mA)
OUTPUT VOLTAGE (V) -40 85
VOLTAGE GAIN (dB)
13
6.1
3
2
12
6.0
1
11
5.9
0
10 -40 -15 10 35 60 85 TEMPERATURE (C)
5.8 -15 10 35 60 TEMPERATURE (C)
-1 -0.2 0.3 0.8 1.3 1.8 2.3 2.8 INPUT VOLTAGE (V)
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch
Typical Operating Characteristics (continued)
(VDD = CPVDD = MODE1 = 3.0V, MODE0 = SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1F, RBIAS = 100k, TA = TMIN to TMAX. RIN = 150 to SGND, unless otherwise noted. VVIDIN = 286mV, gain = 6dB. Typical values are at TA = +25C, unless otherwise noted.)
DIFFERENTIAL GAIN AND PHASE
DIFFERENTIAL GAIN (%) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1 2 3 4 5 6 100ns/div 2 3 4 5 6
MAX9505 toc10
MAX9505
2T RESPONSE
MAX9505 toc11
VIDIN 200mV/div
DIFFERENTIAL PHASE (deg)
VIDOUT 400mV/div
12.5T RESPONSE
MAX9505 toc12
OUT RESPONSE TO NTC-7 VIDEO TEST SIGNAL
MAX9505 toc13
VIDIN 250mV/div 0V
VIDIN 500mV/div
VIDOUT 500mV/div
0V
VIDOUT 1V/div
400ns/div
10s/div
FIELD SQUARE-WAVE RESPONSE
MAX9505 toc14
ON-RESISTANCE vs. VSOUT
MODE0 = MODE1 = VDD VIDIN 500mV/div 4 ON-RESISTANCE () VDD = 2.7V 3
MAX9505 toc15
5
0V
2 VDD = 3.0V 1 VDD = 3.6V
0V
VIDOUT 1V/div
0 2ms/div 0 0.6 1.2 1.8 VSOUT (V) 2.4 3.0 3.6
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch MAX9505
Typical Operating Characteristics (continued)
(VDD = CPVDD = MODE1 = 3.0V, MODE0 = SGND = GND = CPGND = 0V, no load, C1 = C2 = C3 = C4 = 1F, RBIAS = 100k, TA = TMIN to TMAX. RIN = 150 to SGND, unless otherwise noted. VVIDIN = 286mV, gain = 6dB. Typical values are at TA = +25C, unless otherwise noted.) SWITCH LEAKAGE CURRENT ON-RESISTANCE vs. VSOUT vs. TEMPERATURE
MAX9505 toc16
MODE0 = MODE1 = VDD 4 ON-RESISTANCE () TA = +85C 3
800 LEAKAGE CURRENT (pA)
600
SOUT OFF-LEAKAGE
2 TA = +25C TA = -40C
400
1
200
SIN ON-LEAKAGE
0 0 0.5 1.0 1.5 VSOUT (V) 2.0 2.5 3.0
0 -40 -15 10 35 60 85 TEMPERATURE (C)
CHARGE INJECTION vs. VSOUT
MAX9505 toc18
SUPPLY CURRENT vs. TEMPERATURE (NORMAL SWITCH MODE)
VDD = 3V MODE0 = MODE1 = VDD 120 SUPPLY CURRENT (nA)
MAX9505 toc19
30 25 CHARGE INJECTION (pC) 20 15 10 5 0 -5 -10 0
CL = 1nF
150
90
60
30
0.5
1.0
1.5 VSOUT (V)
2.0
2.5
3.0
0 -40 -15 10 35 60 85 TEMPERATURE (C)
ON-RESPONSE, OFF-ISOLATION, CROSSTALK vs. FREQUENCY
MAX9505 toc20
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
VSIN = 2VP-P RL = 600
MAX9505 toc21
20 ON-RESPONSE 0 -20 LOSS (dB) -40 -60 VIDOUT CROSSTALK -80 -100 VIDIN CROSSTALK -120 0.01 0.1 1 OFF-ISOLATION
10
1 THD+N (%)
0.1
0.01
0.001 10 0.01 0.1 1 FREQUENCY (kHz) 10 100 FREQUENCY (MHz)
8
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MAX9505 toc17
5
1000
DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch
Pin Description
PIN QSOP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 -- TQFN 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 EP NAME VSS CPVSS C1N CPGND C1P CPVDD BIAS SGND VIDIN MODE0 MODE1 GND VDD SOUT VIDOUT SIN EP FUNCTION Negative Power Supply. Connect to CPVSS. Charge-Pump Negative Power Supply. Bypass with a 1F capacitor to CPGND. Charge-Pump Flying Capacitor Negative Terminal. Connect a 1F capacitor from C1P to C1N. Charge-Pump Power Ground Charge-Pump Flying Capacitor Positive Terminal. Connect a 1F capacitor from C1P to C1N. Charge-Pump Positive Power Supply. Bypass with a 1F capacitor to CPGND. Common-Mode Voltage. Connect a 100k resistor from BIAS to SGND. Signal Ground. Connect to GND. Video Input Mode Logic Input 0. See Table 1. Mode Logic Input 1. See Table 1. Ground. Connect to SGND. Positive Power Supply. Bypass with a 1F capacitor to SGND. Analog Switch Output Video Output Analog Switch Input Exposed Paddle. Connect to GND.
MAX9505
Detailed Description
The MAX9505 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 MAX9505 features a six-pole, Butterworth filter to perform reconstruction filtering on the video input signal from the DAC.
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 220F to 3000F. 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 MAX9505 does not have a series capacitor, the MAX9505 will not be damaged if the connector is shorted to a supply or to ground (see the Short-Circuit Protection section).
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
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch MAX9505
0V
INPUT 500mV/div 0V
INPUT 500mV/div
0V
OUTPUT 500mV/div
0V
OUTPUT 500mV/div
2ms/div
2ms/div
Figure 3. AC-Coupled Output
Figure 4. DirectDrive Output
Video Amplifier Typically, the black level of the video signal created by the video DAC is around 300mV. The MAX9505 shifts the black level to ground at the output. Therefore, 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. The MAX9505 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 and 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 150). For example, Figure 3 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 4 shows the video signal from a DirectDrive amplifier with the same input signal as the AC-coupled system.
Analog Switch
The MAX9505 features an internal 4.4 (max) analog normally open switch that interfaces with a 4-pole multimedia jack in which one of the poles can be set to a video input, a video output, or a microphone input. The switch has three modes of operation: open, normal switch, and extended range switch. In normal switch mode, the analog range is from 0V to VDD. In extendedrange switch mode, the analog range is from -2V to VDD. Logic inputs MODE1 and MODE0 control the analog switch operating modes (Table 1).
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 MAX9505 contains a six-pole Butterworth lowpass filter. The passband extends to 5.5MHz, and the minimum attenuation is 35dB at 27MHz.
Operating Modes
The MAX9505 uses two logic inputs to set the device into one of the following modes: 1) shutdown mode, 2) extended-range switch mode, 3) video output mode, and 4) normal switch mode. In video output mode, the video circuitry is on, the charge pump is on, and the analog switch is open. In normal switch mode, the analog switch is closed, and the video circuitry and charge pump are off. In the extended-range switch mode, the charge pump is on and the analog switch is closed. Shutdown mode reduces the supply current to 10nA typically (see Table 1 and Typical Application Circuits).
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch MAX9505
Table 1. Operating Modes
OPERATING MODE Shutdown Mode Extended Range Switch Mode Video Output Mode MODE1 0 MODE0 0 VIDEO CIRCUIT Off CHARGE PUMP Off ANALOG SWITCH Open COMMENTS Video output is 4k and analog switch is open Video output is high impedance. Analog switch range is from -2V to VDD. Video output is in normal operation. Analog switch is open. Video output is high impedance. Analog switch range is from SGND to VDD.
0
1
Off
On
Closed
1
0
On
On
Open
Normal Switch Mode
1
1
Off
Off
Closed
Short-Circuit Protection
The MAX9505 typical operating circuit includes a 75 back-termination resistor that limits short-circuit current if an external short is applied to the video output. The MAX9505 features internal output, short-circuit protection to prevent device damage in prototyping and applications where the amplifier output can be directly shorted.
Applications Information
Power-Supply Bypassing and Ground Management
The MAX9505 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 transients 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 1F capacitor to SGND, placed as close to the device as possible. Bypass the charge-pump supply (CPVDD) with a 1F capacitor to CPGND, placed as close to the device as possible. Connect CPVSS to VSS and bypass with a 1F capacitor to CPGND as close to the device as possible.
Shutdown
The MAX9505 features a low-power shutdown mode for battery-powered/portable applications. Shutdown reduces the quiescent current to less than 10nA. Setting MODE1 and MODE0 low disables the outputs and places the MAX9505 into a low-power shutdown mode. In shutdown mode the amplifier, charge pump, and linear regulator are turned off and the video output resistance is 4k.
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch MAX9505
Pin Configurations
SOUT GND 10 VDD
TOP VIEW
12
11
MODE1 9
VSS 1 8 7 MODE0 VIDIN SGND BIAS CPVSS 2 C1N 3 MAX9505 CPGND 4 C1P 5 CPVDD 6
16 SIN 15 VIDOUT 14 SOUT 13 VDD 12 GND 11 MODE1 10 MODE0 9 VIDIN
VIDOUT SIN VSS CPVSS
13 14
MAX9505
15 16 1 C1N 2 CPGND 3 C1P 4 CPVDD 6 5
BIAS 7 SGND 8
QSOP
3mm x 3mm TQFN
Functional Diagram/Typical Operating Circuits
BIAS
1V
100k VDD MODE1 VIDEO ASIC DAC 150 MODE0 BUFFER VIDIN SGND C4 1F GND VDD CPVDD
MAX9505
LOGIC CONTROL 6dB RECONSTRUCTION FILTER VIDEO AMP VIDOUT 75 1 2 3 DC LEVEL SHIFT LINEAR REGULATOR CHARGE PUMP 4
VIDEO OUT AUDIO OUT LEFT AUDIO OUT RIGHT GROUND 4-POLE MULTIMEDIA JACK
C3 1F
CPGND C1P C1 1F
C1N
CPVSS
VSS
C2 1F VIDEO OUTPUT MODE
12
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DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch
Functional Diagram/Typical Operating Circuits (continued)
2.8V FROM LDO BASEBAND IC MIC AMP 2k 2k 1F SOUT SIN
MAX9505
BIAS
1V 75
100k
VIDOUT
1 2 3
MAX9505
VDD MODE1 MODE0 LOGIC CONTROL
MIC INPUT AUDIO OUT LEFT AUDIO OUT RIGHT GROUND 4-POLE MULTIMEDIA JACK
4
SGND C4 1F GND VDD CPVDD
C3 1F
CPGND C1P C1 1F
C1N
CPVSS
VSS
NORMAL SWITCH MODE POLE 1 USED AS A MICROPHONE INPUT
C2 1F
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13
DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch MAX9505
Functional Diagram/Typical Operating Circuits (continued)
VIDEO DECODER SOUT SIN
75
BIAS
1V 75
100k
VIDOUT
1 2 3
MAX9505
VDD MODE1 MODE0 LOGIC CONTROL
VIDEO INPUT AUDIO OUT LEFT AUDIO OUT RIGHT GROUND 4-POLE MULTIMEDIA JACK
4
SGND C4 1F GND VDD CPVDD CHARGE PUMP C3 1F CPGND C1P C1 1F C1N
LINEAR REGULATOR
CPVSS
VSS
NORMAL SWITCH MODE POLE 1 USED AS A VIDEO INPUT
C2 1F
Chip Information
PROCESS: BICMOS
14
______________________________________________________________________________________
DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch
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.)
MAX9505
PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH
21-0055
E
1
1
______________________________________________________________________________________
QSOP.EPS
15
DirectDrive Video Amplifier with Reconstruction Filter and Analog Switch MAX9505
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.)
12x16L QFN THIN.EPS
E
1 2
D2 b
0.10 M C A B
D D/2
D2/2
E/2
E2/2
C L
E
(NE - 1) X e
E2
L
C L
e
k (ND - 1) X e
C L
0.10 C 0.08 C A A2 A1 L
C L
L
e
e
PACKAGE OUTLINE 12, 16L, THIN QFN, 3x3x0.8mm
21-0136
PKG REF. A b D E e L N ND NE A1 A2 k 0.25 0 MIN. 0.70 0.20 2.90 2.90 0.45
12L 3x3 NOM. 0.75 0.25 3.00 3.00 0.50 BSC. 0.55 12 3 3 0.02 0.20 REF 0.05 0 0.25 0.65 0.30 MAX. 0.80 0.30 3.10 3.10 MIN. 0.70 0.20 2.90 2.90
16L 3x3 NOM. 0.75 0.25 3.00 3.00 0.50 BSC. 0.40 16 4 4 0.02 0.20 REF 0.05 0.50 MAX. 0.80 0.30 3.10 3.10 PKG. CODES T1233-1 T1233-3 T1633-1 T1633-2 T1633F-3 T1633-4
EXPOSED PAD VARIATIONS
D2 MIN. 0.95 0.95 0.95 0.95 0.65 0.95 NOM. 1.10 1.10 1.10 1.10 0.80 1.10 MAX. 1.25 1.25 1.25 1.25 0.95 1.25 MIN. 0.95 0.95 0.95 0.95 0.65 0.95 E2 NOM. MAX. 1.10 1.10 1.10 1.10 0.80 1.10 1.25 1.25 1.25 1.25 0.95 1.25 PIN ID 0.35 x 45 0.35 x 45 0.35 x 45 0.35 x 45 JEDEC WEED-1 WEED-1 WEED-2 WEED-2
DOWN BONDS ALLOWED
NO YES NO YES N/A NO
0.225 x 45 WEED-2 0.35 x 45 WEED-2
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.
PACKAGE OUTLINE 12, 16L, THIN QFN, 3x3x0.8mm
21-0136
E
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Inc.

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