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19-2813; Rev 0; 4/03
3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current
General Description
The MAX4090 3V/5V, 6dB video buffer with sync-tip clamp, output sag correction, and low-power shutdown mode is available in tiny SOT23 and SC70 packages. The sag-corrected output of the MAX4090 is designed to drive AC-coupled, 150 back-terminated video loads in portable video applications such as digital still cams, portable DVD players, digital camcorders, PDAs, video-enabled cell phones, portable game systems, and notebook computers. The sag correction feature introduces low-frequency compensation that reduces the value of the normally bulky and expensive 330F AC-coupling capacitor to two small, less expensive 22F capacitors. The input clamp positions the video waveform at the output and allows the MAX4090 to be used as either an AC- or DC-coupled output driver. The MAX4090 operates from a single 2.7V to 5.5V supply and consumes only 6.5mA of supply current. The low-power shutdown mode reduces the supply current to 150nA, making the MAX4090 ideal for low-voltage, battery-powered video applications. The MAX4090 is available in tiny 6-pin SOT23 and SC70 packages and is specified over the extended -40C to +85C temperature range. o Input Sync-Tip Clamp o AC- or DC-Coupled Output o Low-Power Shutdown Mode Reduces Supply Current to 150nA o SAG Correction Reduces Output-Coupling Capacitors from 330F to 22F o Available in Space-Saving SOT23 and SC70 Packages
Features
o Single-Supply Operation from 2.7V to 5.5V
MAX4090
Ordering Information
PART MAX4090EXT-T MAX4090EUT-T TEMP RANGE -40C to +85C -40C to +85C PINPACKAGE 6 SC70-6 6 SOT23-6 TOP MARK ABM ABOX
Applications
Portable Video/Game Systems/DVD Players Digital Camcorders/Televisions/Still Cameras PDAs Video-Enabled Cell Phones Notebook Computers Portable/Flat-Panel Displays
Block Diagram
TOP VIEW
VCC
Pin Configuration
TOP VIEW
MAX4090
IN OUT CLAMP 2.3k SAG
OUT 1
6
SAG 580 780
GND 2
MAX4090
5
SHDN
1.2k SHDN
IN 3
4
VCC GND
SC70/SOT23
________________________________________________________________ Maxim Integrated Products
1
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3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4090
ABSOLUTE MAXIMUM RATINGS
VCC to GND ............................................................. -0.3V to +6V OUT, SAG, SHDN to GND......................... -0.3V to (VCC + 0.3V) IN to GND (Note 1) ................................... VCLP to (VCC + 0.3V) IN Short-Circuit Duration from -0.3V to VCLP ........................1min Output Short-Circuit Duration to VCC or GND .......... Continuous Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 8.7mW/C above +70C) ...........695mW 6-Pin SC70 (derate 3.1mW/C above +70C) .............245mW Operating Temperature Range ..........................-40C to +85C Junction Temperature .....................................................+150C Storage Temperature Range ............................-65C to +150C Lead Temperature (soldering, 10s) ................................+300C
Note 1: VCLP is the input clamp voltage as defined in the DC Electrical Characteristics table.
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.
DC ELECTRICAL CHARACTERISTICS
(VCC = 3.0V, GND = 0V, CIN = 0.1F from IN to GND, RL = infinity to GND, SAG shorted to OUT, SHDN = 3.0V, TA = -40C to +85C. Typical values are at TA = +25C, unless otherwise noted.) (Note 2)
PARAMETER Supply Voltage Range Quiescent Supply Current Shutdown Supply Current Input Clamp Voltage Input Voltage Range Input Bias Current Input Resistance Voltage Gain Power-Supply Rejection Ratio Output Voltage High Swing Output Voltage Low Swing Output Current Output Short-Circuit Current SHDN Logic-Low Threshold SHDN Logic-High Threshold SHDN Input Current Shutdown Output Impedance AV PSRR VOH VOL IOUT ISC VIL VIH IIH At DC ROUT
(Disabled)
SYMBOL VCC ICC ISHDN VCLP VIN IBIAS
CONDITIONS Guaranteed by PSRR VIN = VCLP SHDN = 0V Input referred Inferred from voltage gain (Note 3) VIN = 1.45V VCLP + 0.5V < VIN < VCLP + 1V RL = 150, 0.5V < VIN < 1.45V (Note 4) 2.7V < VCC < 5.5V RL = 150 RL = 150 Sourcing, RL = 20 to GND Sinking, RL = 20 to VCC OUT shorted to VCC or GND VCC = 3V VCC = 5V VCC = 3V VCC = 5V
MIN 2.7
TYP 6.5 6.5 0.15
MAX 5.5 10 10 1 0.47 1.45 35 2.1
UNITS V mA A V V A M V/V dB V
0.27 VCLP
0.38 22.5 3
1.9 60 2.55 4.3 45 40
2 80 2.7 4.6 VCLP 85 85 110
0.47
V mA mA
VCC x 0.3 VCC x 0.7 0.003 4 2 SHDN = 0V At 3.58MHz or 4.43MHz 1
V V A k
2
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3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current
AC ELECTRICAL CHARACTERISTICS
(VCC = 3.0V, GND = 0V, COUT = CSAG = 22F, CIN = 0.1F, RIN = 75 to GND, RL = 150 to GND, SHDN = VCC, TA = +25C, unless otherwise noted.)
PARAMETER Small-Signal -3dB Bandwidth Large-Signal -3dB Bandwidth Small-Signal 0.1dB Gain Flatness Large-Signal 0.1dB Gain Flatness Slew Rate Settling Time to 0.1% Power-Supply Rejection Ratio Output Impedance Differential Gain Differential Phase Group Delay Peak Signal to RMS Noise Droop SHDN Enable Time SHDN Disable Time tON tOFF SYMBOL BWSS BWLS VOUT = 2VP-P CONDITIONS VOUT = 100mVP-P MIN TYP 55 45 25 17 275 25 50 2.5 VCC = 3V VCC = 5V VCC = 3V VCC = 5V 1 0.5 0.8 0.5 20 65 2 250 50 3 MAX UNITS MHz MHz MHz MHz V/s ns dB % Degrees ns dB % ns ns
MAX4090
BW0.1dBSS VOUT = 100mVP-P BW0.1dBLS VOUT = 2VP-P SR tS PSRR ZOUT DG DP D/dT SNR VOUT = 2V step VOUT = 2V step f = 100kHz f = 5MHz NTSC NTSC
f = 3.58MHz or 4.43MHz VIN = 1VP-P, 10MHz BW CIN = 0.1F (Note 4) VIN = VCLP + 1V, SHDN = 3V, VOUT settled to within 1% of the final voltage VIN = VCLP + 1V, SHDN = 0V, VOUT settled to below 1% of the output voltage
Note 2: All devices are 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 3: Voltage gain (AV) is referenced to the clamp voltage, i.e., an input voltage of VIN = VCLP + VI would produce an output voltage of VOUT = VCLP + AV x VI. Note 4: Droop is guaranteed by the Input Bias Current specification.
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3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4090
Typical Operating Characteristics
(VCC = 3.0V, GND = 0V, COUT = CSAG = 22F, CIN = 0.1F, RIN = 75 to GND, RL = 150 to GND, SHDN = VCC, TA = +25C, unless otherwise noted.)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4090 toc01
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX4090 toc02
SMALL-SIGNAL GAIN vs. FREQUENCY
2 1 0 GAIN (dB) -1 -2 -3
MAX4090 toc03
3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 AV = 2 VCC = 3V VOUT = 100mVP-P 100k 1M 10M
0.3 0.2 0.1 0 GAIN (dB) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 AV = 2 VCC = 3V VOUT = 100mVP-P 100k 1M 10M
3
-4 -5 -6 100M
AV = 2 VCC = 5V VOUT = 100mVP-P 100k 1M 10M 100M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX4090 toc04
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4090 toc05
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
0.2 0.1 0 GAIN (dB) -0.1 -0.2 -0.3
MAX4090 toc06
0.3 0.2 0.1 0 GAIN (dB) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 AV = 2 VCC = 5V VOUT = 100mVP-P 100k 1M 10M
3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 AV = 2 VCC = 3V VOUT = 2VP-P 100k 1M 10M
0.3
-0.4 -0.5 -0.6 100M FREQUENCY (Hz)
AV = 2 VCC = 3V VOUT = 2VP-P 100k 1M 10M 100M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4090 toc07
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX4090 toc08
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
VCC = 3V -10 -20 PSRR (dB) -30 -40 -50 -60
MAX4090 toc09
3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 AV = 2 VCC = 5V VOUT = 2VP-P 100k 1M 10M
0.3 0.2 0.1 0 GAIN (dB) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 AV = 2 VCC = 5V VOUT = 2VP-P 100k 1M 10M
0
-70 -80 100M 10k 100k 1M FREQUENCY (Hz) 10M 100M FREQUENCY (Hz)
100M
FREQUENCY (Hz)
4
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3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current
Typical Operating Characteristics (continued)
(VCC = 3.0V, GND = 0V, COUT = CSAG = 22F, CIN = 0.1F, RIN = 75 to GND, RL = 150 to GND, SHDN = VCC, TA = +25C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4090 toc10
MAX4090
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
MAX4090 toc11
CLAMP VOLTAGE vs. TEMPERATURE
VCC = 3V 0.55 0.50 VCLAMP (V)
MAX4090 toc12
0 -10 -20 PSRR (dB) -30 -40 -50 -60 -70 -80 10k 100k 1M FREQUENCY (Hz) 10M VCC = 5V
6.80 6.75 6.70 SUPPLY CURRENT (mA) 6.65 6.60 6.55 6.50 6.45 6.40 6.35 6.30 VCC = 3V VCC = 5V
0.60
0.45 0.40 0.35 0.30 0.25 0.20
100M
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
TEMPERATURE (C)
TEMPERATURE (C)
CLAMP VOLTAGE vs. TEMPERATURE
VCC = 5V 0.55 0.50 VCLAMP (V) GAIN (V/V) 0.45 0.40 0.35 0.30 0.25 0.20 -50 -25 0 25 50 75 100 TEMPERATURE (C) 1.90 -50 1.95
MAX4090 toc13
VOLTAGE GAIN vs. TEMPERATURE
MAX4090 toc14
VOLTAGE GAIN vs. TEMPERATURE
VCC = 5V 2.05 GAIN (V/V)
MAX4090 toc15
0.60
2.10 VCC = 3V 2.05
2.10
2.00
2.00
1.95
1.90 -25 0 25 50 75 100 -50 -25 0 25 50 75 100 TEMPERATURE (C) TEMPERATURE (C)
OUTPUT VOLTAGE HIGH SWING vs. TEMPERATURE
MAX4090 toc16
OUTPUT VOLTAGE HIGH SWING vs. TEMPERATURE
4.9 OUTPUT VOLTAGE HIGH (V) 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 VOUT 1V/div VCC = 5V
MAX4090 toc17
LARGE-SIGNAL PULSE RESPONSE
MAX4090 toc18
3.0 2.9 OUTPUT VOLTAGE HIGH (V) 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 -50 -25 0 25 50 75 VCC = 3V
5.0
VIN 500mV/div
100
-50
-25
0
25
50
75
100
10ns/div
TEMPERATURE (C)
TEMPERATURE (C)
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5
3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4090
Typical Operating Characteristics (continued)
(VCC = 3.0V, GND = 0V, COUT = CSAG = 22F, CIN = 0.1F, RIN = 75 to GND, RL = 150 to GND, SHDN = VCC, TA = +25C, unless otherwise noted.)
SMALL-SIGNAL PULSE RESPONSE
MAX4090 toc19
DIFFERENTIAL GAIN AND PHASE
DIFFERENTIAL GAIN (%) 1.0 0 -1.0 -2.0 1.0 DIFFERENTIAL PHASE () 0.5 0 -0.5 -1.0 0 1 2 3 4 5 6 0 1 2 3 4 5 6
MAX4090 toc20
2.0
VIN 25mV/div
VOUT 50mV/div
10ns/div
Pin Description
PIN 1 2 3 4 NAME OUT GND IN VCC Video Output Ground Video Input Power-Supply Voltage. Bypass with a 0.1F capacitor to ground as close to pin as possible. Shutdown. Pull SHDN low to place the MAX4090 in low-power shutdown mode. Sag Correction
IN
Typical Application Circuit
VCC
FUNCTION
MAX4090
COUT OUT RIN CLAMP RL
5 6
SHDN SAG
CSAG SAG
SHDN
GND
6
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3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4090
Detailed Description
The MAX4090 3V/5V, 6dB video buffer with sync-tip clamp, output sag correction, and low-power shutdown mode is available in tiny SOT23 and SC70 packages. The sag-corrected output of the MAX4090 is designed to drive AC-coupled, 150 back-terminated video loads in portable video applications such as digital still cams, portable DVD players, digital camcorders, PDAs, video-enabled cell phones, portable game systems, and notebook computers. The sag correction feature introduces low-frequency compensation that reduces the value of the normally bulky and expensive 330F AC-coupling capacitor to two small, less expensive 22F capacitors. The input clamp positions the video waveform at the output and allows the MAX4090 to be used as either an AC- or DC-coupled output driver. The MAX4090 operates from a single 2.7V to 5.5V supply and consumes only 6.5mA of supply current. The low-power shutdown mode reduces the supply current to 150nA, making the MAX4090 ideal for low-voltage, battery-powered video applications. The input signal to the MAX4090 is AC-coupled through a capacitor into an active sync-tip clamp circuit, which places the minimum of the video signal at approximately 0.38V. The output buffer amplifies the video signal while still maintaining the 0.38V clamp voltage at the output. For example, if VIN = 0.38V, then VOUT = 0.38V. If VIN = (0.38V + 1V) = 1.38V, then VOUT = (0.38V + 2 X (1V)) = 2.38V when SAG is shorted OUT. The net result is that a 2V video output signal swings within the usable output voltage range of the output buffer when VCC = 3V. There are two common output connections for the MAX4090: 1) SAG is shorted to OUT and 150 is directly connected from OUT to ground (see Figure 2). 2) Two capacitors and 150 are connected between OUT, SAG, and ground (see Figure 3). the gain, and creating a high-impedance node at the SAG output. This node is AC-coupled to the load in parallel with the normal output, as shown in Figure 3. This allows the use of two smaller capacitors (COUT and CSAG), typically 22F, substantially reducing the size of the interface caps and their cost while retaining the lowfrequency response. The minimum value of the output-coupling capacitor is a function of the acceptable Field Tilt. In Figure 1, the Field Tilt is given for several values of capacitance from 10F to 47F for comparison. Although values lower than 22F may have acceptable Field Tilt, they are not recommended, since tolerance, aging, and voltage and temperature coefficients reduce the capacitance in actual applications. Increasing the outputcoupling capacitors beyond 47F does not improve performance.
Shutdown Mode
The MAX4090 features a low-power shutdown mode (ISHDN = 150nA) for battery-powered/portable applications. Pulling the SHDN pin high enables the output. Connecting the SHDN pin to ground (GND) disables the output and places the MAX4090 into a low-power shutdown mode.
Applications Information
Input Coupling the MAX4090
The MAX4090 input must be AC-coupled because the input capacitor stores the clamp voltage. The MAX4090 requires a typical value of 0.1F for the input clamp to meet the Line Droop specification. A minimum of a ceramic capacitor with an X7R temperature coefficient is recommended to avoid temperature-related prob-
100
80 FIELD TIME DISTORTION IN % PEAK TO PEAK (%)
Sag Correction
Sag correction refers to the low-frequency compensation of the highpass filter formed by the 150 load of a back-terminated coax and the output-coupling capacitor. This break point must be low enough in frequency to pass the Vertical Sync Interval (<25Hz for PAL and <30Hz for NTSC) to avoid Field Tilt. Traditionally, the break point is made <3~5Hz, and the coupling capacitor must be very large, typically >330F. The MAX4090 reduces the value of this coupling capacitor, replacing it with a pair of 22F capacitors. This is done by putting a resistor network in series with the feedback, raising
60
40
20
0 0 10 20 30 40 50 COUPLING CAPACITANCE (F)
Figure 1. Field Tilt vs. Output-Coupling Capacitance 7
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3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4090
VCC = 2.7V TO 5.5V VCC CBYP 0.1F CIN 0.1F IN OUT CLAMP
RSOURCE 75
MAX4090
SHDN
ROUT 75
ESIGNAL
RIN 75
EOUT RL 75
SAG
GND
Figure 2. DC-Coupling the MAX4090
VCC = 2.7V TO 5.5V VCC SHDN CBYP 0.1F
RSOURCE 75
CIN 0.1F IN
MAX4090
COUT 22F OUT CLAMP CSAG 22F SAG
ROUT 75
ESIGNAL
RIN 75
EOUT RL 75
GND
Figure 3. AC-Coupling the MAX4090
8
_______________________________________________________________________________________
3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current
lems with Line Droop. For extended temperature operation, such as outdoor applications, or where the impressed voltage is close to the rated voltage of the capacitor, a film dielectric is recommended. Increasing the capacitor value slows the clamp capture time. Values above 0.5F should be avoided since they do not improve the clamp's performance. The active sync-tip clamp also requires that the input impedance seen by the input capacitor be less than 100 typically to function properly. This is easily met by the 75 input resistor prior to the input-coupling capacitor and the back termination from a prior stage. Insufficient input resistance to ground causes the MAX4090 to appear to oscillate. Never operate the MAX4090 in this mode. AC-Coupling the Output The MAX4090's output is configured to support ACcoupling with minimal capacitance. This is called "sag correction." It refers to the improved bandwidth achieved by using two smaller capacitors to replace a single large capacitor shown in Figure 3.
MAX4090
Layout and Power-Supply Bypassing
The MAX4090 operates from single 2.7V to 5.5V supply. Bypass the supply with a 0.1F capacitor as close to the pin as possible. Maxim recommends using microstrip and stripline techniques to obtain full bandwidth. To ensure that the PC board does not degrade the device's performance, design it for a frequency greater than 1GHz. Pay careful attention to inputs and outputs to avoid large parasitic capacitance. Whether or not you use a constant-impedance board, observe the following design guidelines: * Do not use wire-wrap boards; they are too inductive. * Do not use IC sockets; they increase parasitic capacitance and inductance. * Use surface-mount instead of through-hole components for better, high-frequency performance. * Use a PC board with at least two layers; it should be as free from voids as possible. * Keep signal lines as short and as straight as possible. Do not make 90 turns; round all corners.
Output Coupling the MAX4090
The output of the MAX4090 can be AC- or DC-coupled to the load. In the DC-coupled mode, the MAX4090 provides accurate sync-tip clamping for single-supply operation and still can drive a 150, back-terminated load. In the AC-coupled mode, the MAX4090 allows the use of minimal size capacitors to drive a back-terminated video load of 150. DC-Coupling the Output By shorting SAG to OUT, the device becomes an amplifier with DC restore, optimally placing the video within the dynamic range of the output. In this mode, the MAX4090 can be used as the input conditioner for a video signal, providing gain and biasing in single-supply applications. DC-coupling also improves the MAX4090's performance in terms of differential gain and phase. This reflects the improvement in the low-frequency response due to DC-coupling.
Chip Information
TRANSISTOR COUNT: 755 PROCESS: BiCMOS
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9
3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4090
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.)
SC70, 6L.EPS
10
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3V/5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current
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.)
6LSOT.EPS
MAX4090
PACKAGE OUTLINE, SOT-23, 6L
21-0058
F
1 1
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 ____________________ 11 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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