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LT6205/LT6206/LT6207 Single/Dual/Quad Single Supply 3V, 100MHz Video Op Amps DESCRIPTIO
The LT(R)6205/LT6206/LT6207 are low cost single/dual/ quad voltage feedback amplifiers that feature 100MHz gain-bandwidth product, 450V/s slew rate and 50mA output current. These amplifiers have an input range that includes ground and an output that swings within 60mV of either supply rail, making them well suited for single supply operation. These amplifiers maintain their performance for supplies from 2.7V to 12.6V and are specified at 3V, 5V and 5V. The inputs can be driven beyond the supplies without damage or phase reversal of the output. Isolation between channels is high, over 90dB at 10MHz. The LT6205 is available in the 5-pin SOT-23, and the LT6206 is available in an 8-lead MSOP package with standard op amp pin-outs. For compact layouts the quad LT6207 is available in the 16-pin SSOP package. These devices are specified over the commercial and industrial temperature ranges.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
s s s s s s s s s s
s s
450V/s Slew Rate 100MHz Gain Bandwidth Product Wide Supply Range 2.7V to 12.6V Output Swings Rail-to-Rail Input Common Mode Range Includes Ground High Output Drive: 50mA Channel Separation: 90dB at 10MHz Specified on 3V, 5V, and 5V Supplies Input Offset Voltage: 1mV Low Power Dissipation: 20mW Per Amplifier on Single 5V Operating Temperature Range: -40C to 85C Single in SOT-23, Dual in MSOP, Quad in SSOP Package
APPLICATIO S
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Video Line Driver Automotive Displays RGB Amplifiers Coaxial Cable Drivers Low Voltage High Speed Signal Processing
TYPICAL APPLICATIO
3.3V
Baseband Video Splitter/Cable Driver
499
499 8
1F
75 VOUT1
VOUT 0V
LT6206 2
75 1
- +
VIN 75
3
VIN 0V
7 75 VOUT2 75 4 F3dB 50MHz IS 25mA
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5
+ -
6
VS = 3.3V VIN = 0.1V TO 1.1V f = 10MHz
499
499
U
U
U
Output Step Response
20ns/DIV
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1
LT6205/LT6206/LT6207
ABSOLUTE
(Note 1)
AXI U RATI GS
Operating Temperature Range .................-40C to 85C Specified Temperature Range (Note 4) ....-40C to 85C Storage Temperature Range ..................-65C to 150C Maximum Junction Temperature .......................... 150C Lead Temperature (Soldering, 10 sec).................. 300C
Total Supply Voltage (V + to V -) ............................ 12.6V Input Current ...................................................... 10mA Input Voltage Range (Note 2) ................................... VS Output Short-Circuit Duration (Note 3) ............ Indefinite Pin Current While Exceeding Supplies (Note 9) .. 25mA
PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT 1 V- 2
- +
5 V+
+IN 3
4 -IN
OUT A -IN A +IN A V-
1 2 3 4
S5 PACKAGE 5-LEAD PLASTIC SOT-23 TJMAX = 150C, JA = 250C/W
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150C, JA = 250C/W
ORDER PART NUMBER LT6205CS5 LT6205IS5
S5 PART MARKING* LTAEM
ORDER PART NUMBER LT6206CMS8 LT6206IMS8
*The temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = 1V, unless otherwise noted.
SYMBOL VOS PARAMETER Input Offset Voltage
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
Input Offset Voltage Match (Channel-to-Channel) (Note 5) Input Offset Voltage Drift (Note 6) IB IOS en in Input Bias Current Input Offset Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance 0.1Hz to 10Hz f = 10kHz f = 10kHz VCM = 0V to V+ - 2V
2
U
U
W
WW U
W
TOP VIEW OUT A 1 -IN A 2
- +
16 OUT D
A D - +
15 -IN D 14 +IN D 13 V -
TOP VIEW
- + - +
8 7 6 5
V+ OUT B -IN B +IN B
+IN A 3 V+ 4 +IN B 5 -IN B 6 OUT B 7 NC 8
+ -
B
C
+ -
12 +IN C 11 -IN C 10 OUT C 9 NC
GN PACKAGE 16-LEAD NARROW PLASTIC SSOP TJMAX = 150C, JA = 135C/W
MS8 PART MARKING LTH3 LTH4
ORDER PART NUMBER LT6207CGN LT6207IGN
GN PART MARKING 6207 6207I
MIN
TYP 1 1
MAX 3.5 5 3 4 15 30 3
UNITS mV mV mV mV V/C A A VP-P nV/Hz pA/Hz M pF
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q q q q
7 10 0.6 2 9 4 1 2
LT6205/LT6206/LT6207
The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = 1V, unless otherwise noted.
SYMBOL CMRR PSRR PARAMETER Common Mode Rejection Ratio Input Voltage Range Power Supply Rejection Ratio Minimum Supply Voltage AVOL Large-Signal Voltage Gain VS = 3V to 12V VCM = VOUT = 0.5V VCM = 0.5V VS = 5V, VO = 0.5V to 4.5V, RL = 1k VS = 5V, VO = 1V to 3V, RL = 150 VS = 3V, VO = 0.5V to 2.5V, RL = 1k No Load, Input Overdrive = 30mV ISINK = 5mA VS = 5V, ISINK = 25mA VS = 3V, ISINK = 15mA No Load, Input Overdrive = 30mV ISOURCE = 5mA VS = 5V, ISOURCE = 25mA VS = 3V, ISOURCE = 15mA VS = 5V, Output Shorted to GND
q
ELECTRICAL CHARACTERISTICS
CONDITIONS VCM = 0 to V+ - 2V
q q q q q q q q q q q q q q q
MIN 78 0 67
TYP 90
MAX V+ - 2
UNITS dB V dB
75 2.7
V V/mV V/mV V/mV
30 5 20
100 20 60 10 75 300 200 60 140 650 300 25 150 500 350 100 250 1200 500
VOL
Output Voltage Swing Low (Note 7)
mV mV mV mV mV mV mV mV mA mA mA mA
VOH
Output Voltage Swing High (Note 7)
ISC
Short-Circuit Current
35 25 30 20
60 50 3.75 5 5.75
VS = 3V, Output Shorted to GND
q
IS GBW SR
Supply Current per Amplifier
q
mA mA MHz V/s dB MHz ns ns % Deg
Gain Bandwidth Product Slew Rate Channel Separation
f = 2MHz VS = 5V, AV = 2, RF = RG = 1k VO = 1V to 4V, Measured from 1.5V to 3.5V f = 10MHz VOUT = 2VP-P (Note 8) VS = 5V, VOUT = 2V, AV = -1, RL = 150 VS = 5V, AV = 2, RL = 150, Output Black Level =1V VS = 5V, AV = 2, RL = 150, Output Black Level =1V
q
65
100 450 90 71 15 25 0.05 0.08
FPBW tS
Full Power Bandwidth Settling time to 3% Settling time to 1% Differential Gain Differential Phase
The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 5V; VCM = VOUT = 0V, unless otherwise noted.
SYMBOL VOS PARAMETER Input Offset Voltage
q
CONDITIONS
MIN
TYP 1.3 1
MAX 4.5 6 3 4 18 30 3
UNITS mV mV mV mV V/C A A VP-P
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Input Offset Voltage Match (Channel-to-Channel) (Note 5) Input Offset Voltage Drift (Note 6) IB IOS Input Bias Current Input Offset Current Input Noise Voltage 0.1Hz to 10Hz
q q q q
10 18 0.6 2
3
LT6205/LT6206/LT6207
ELECTRICAL CHARACTERISTICS
SYMBOL en in PARAMETER Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance CMRR PSRR AVOL Common Mode Rejection Ratio Input Voltage Range Power Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing VS = 2V to 6V VO = -4V to 4V, RL = 1k VO = -3V to 3V, RL = 150 No Load, Input Overdrive = 30mV IOUT = 5mA IOUT = 25mA Short to Ground
q
The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 5V; VCM = VOUT = 0V, unless otherwise noted.
CONDITIONS f = 10kHz f = 10kHz VCM = -5V to 3V VCM = -5V to 3V
q q q q q q q q
MIN
TYP 9 4 1 2
MAX
UNITS nV/Hz pA/Hz M pF dB
78 -5 67 50 7.5 4.88 4.75 3.8 40 30
90 3 75 133 20 4.92 4.85 4.35 60 4 5.6 6.5
V dB V/mV V/mV V V V mA mA mA mA MHz V/s dB MHz ns ns % Deg
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier
q
Gain Bandwidth Product Slew Rate Channel Separation
f = 2MHz AV = -1, RL = 1k VO = -4V to 4V, Measured from -3V to 3V f = 10MHz VOUT = 8VP-P (Note 8) VOUT = 2V, AV = -1, RL = 150 AV = 2, RL = 150, Output Black Level = 1V AV = 2, RL = 150, Output Black Level = 1V
q
65 350
100 600 90
FPBW tS
Full Power Bandwidth Settling Time to 3% Settling Time to 1% Differential Gain Differential Phase
14
24 15 25 0.05 0.08
Note 1: Absolute Maximum ratings are those values beyond which the life of a device may be impaired. Note 2: The inputs are protected by back-to-back diodes. If the differential input voltage exceeds 1.4V, the input current should be limited to less than 10mA. Note 3: A heat sink may be required to keep the junction temperature below absolute maximum. This depends on the power supply voltage and how many amplifiers are shorted. Note 4: The LT6205C/LT6206C/LT6207C are guaranteed to meet specified performance from 0C to 70C and are designed, characterized and expected to meet specified performance from -40C to 85C but are not tested or QA sampled at these temperatures. The LT6205I/LT6206I/ LT6207I are guaranteed to meet specified performance from -40C to 85C.
Note 5: Matching parameters are the difference between the two amplifiers A and D and between B and C of the LT6207; between the two amplifiers of the LT6206. Note 6: This parameter is not 100% tested. Note 7: Output voltage swings are measured between the output and power supply rails. Note 8: Full power bandwidth is calculated from the slew rate measurement: FPBW = SR/2VPEAK. Note 9: There are reverse biased ESD diodes on all inputs and outputs. If these pins are forced beyond either supply, unlimited current will flow through these diodes. If the current is transient in nature and limited to less than 25mA, no damage to the device will occur.
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LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS
VOS Distribution
40 35 SUPPLY CURRENT PER AMPLIFIER (mA) VS = 5V, 0V VCM = 1V 5 TA = 125C 4 TA = 25C 3 TA = -55C
CHANGE IN INPUT OFFSET VOLTAGE (V)
PERCENT OF UNITS (%)
30 25 20 15 10 5 0 -3 -2 -1 0 1 2 INPUT OFFSET VOLTAGE (mV) 3
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Change in Offset Voltage vs Input Common Mode Voltage
1000
OFFSET VOLTAGE CHANGE (V)
VS = 5V, 0V INPUT BIAS CURRENT (A)
INPUT BIAS CURRENT (A)
800
600
400 TA = 25C 200 TA =125C 0 0 TA = -55C 1 2 3 4 INPUT COMMON MODE VOLTAGE (V) 5
Output Saturation Voltage vs Load Current (Output Low)
10
OUTPUT SHORT-CIRCUIT CURRENT (mA)
OUTPUT SATURATION VOLTAGE (V)
OUTPUT SATURATION VOLTAGE (V)
VS = 5V, 0V VOD = 30mV TA = 125C
1 TA = 25C
0.1
0.01 0.01
0.1 1 10 LOAD CURRENT (mA)
UW
TA = -55C
Supply Current per Amplifier vs Supply Voltage
100 0 -100 -200 -300 -400 -500
Minimum Supply Voltage
TA = -55C TA =125C TA = 25C
2
1
0 0 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V)
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-600 1.5
2.0
2.5 3.0 3.5 4.0 4.5 TOTAL SUPPLY VOLTAGE (V)
5.0
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Input Bias Current vs Input Common Mode Voltage
-2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 0 1 2 3 4 INPUT COMMON MODE VOLTAGE (V) 5 TA = -55C TA = 25C TA = 125C VS = 5V, 0V -4 -5 -6 -7 -8 -9 -10 -11
Input Bias Current vs Temperature
VS = 5V, 0V VCM = 1V
-12 -50
-25
0 25 50 75 TEMPERATURE (C)
100
125
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Output Saturation Voltage vs Load Current (Output High)
10
Short-Circuit Current vs Temperature
75 70 65 60 55 SOURCING 50 45 40 35 -50 -25 VS = 3V, 0V VCM = 1V SINKING SOURCING VS = 5V, 0V VCM = 1V SINKING
VS = 5V, 0V VOD = 30mV
TA = 125C
1 TA = 25C
0.1
TA = -55C
100
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0.01 0.01
0.1 1 10 LOAD CURRENT (mA)
100
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0 25 50 75 TEMPERATURE (C)
100
125
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LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS
Short-Circuit Current vs Temperature
90 OUTPUT SHORT-CIRCUIT CURRENT (mA) 80 VS = 5V 500 400 300 SINKING 70 60 50 40 3O -50 SOURCING
INPUT VOLTAGE (V)
200 100 0 -100 -200 -300 -400 -500 RL = 150 RL = 1k
INPUT VOLTAGE (V)
-25
0 25 50 75 TEMPERATURE (C)
Warm Up Drift vs Time (LT6206)
120 CHANGE IN OFFSET VOLTAGE (V) 100 80 VS = 5V, 0V 60 40 20 0 0 10 20 30 40 50 60 70 80 90 100 TIME AFTER POWER-UP (s)
620567 G13
INPUT NOISE CURRENT DENSITY (pA/Hz)
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
VS = 5V
0.1Hz to 10Hz Noise Voltage
VS = 5V, 0V VCM = 1V TA = 25C
NOISE VOLTAGE (1V/DIV)
70 60 50 40
VS = 3V, 0V VS = 5V
GAIN BANDWIDTH (MHz)
GAIN (dB)
TIME (2 SEC/DIV)
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6
UW
100
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Open-Loop Gain
VS = 5V, 0V VCM = 1V TA = 25C 500 400 300 200 100 0 -100 -200 -300 -400 -500 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT VOLTAGE (V)
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Open-Loop Gain
VS = 5V TA = 25C
RL = 1k
RL = 150
125
-5 -4 -3 -2 -1 0 1 2 3 OUTPUT VOLTAGE (V)
4
5
620567 G12
Input Noise Voltage Density vs Frequency
30 25 20 15 10 5 0 100 VS = 5V, 0V VCM = 1V TA = 25C 16 14 12 10 8 6 4 2
Input Noise Current Density vs Frequency
VS = 5V, 0V VCM = 1V TA = 25C
TA = 25C
1k 10k FREQUENCY (Hz)
100k
620567 G14
0 100
1k 10k FREQUENCY (Hz)
100k
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Gain and Phase vs Frequency
140 PHASE 120 100 80 60 40 20 VS = 3V, 0V TA = 25C RL = 1k CL = 5pF 1M GAIN VS = 5V 100M 0 -20 -40 500M
Gain Bandwidth and Phase Margin vs Supply Voltage
TA = 25C RF = RG = 1k CL = 5pF PHASE MARGIN 40 110 GAIN BANDWIDTH 105 100 95 0 2 4 6 8 10 TOTAL SUPPLY VOLTAGE (V) 12 35 50 45
PHASE MARGIN (DEG)
PHASE (DEG)
30 20 10 0 -10
-20 100k
10M FREQUENCY (Hz)
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LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS
Gain Bandwidth and Phase Margin vs Temperature
RL = 1k CL = 5pF GAIN BANDWIDTH (MHz) 55 VS = 5V 50 45 PHASE MARGIN (DEG)
750 700 650 RISING VS = 5V FALLING VS = 5V
SLEW RATE (V/s)
PHASE MARGIN VS = 3V, 0V 120 110 100 90 80 -50 -25 VS = 3V, 0V GAIN BANDWIDTH 0 25 50 75 TEMPERATURE (C) 100 VS = 5V
SLEW RATE (V/s)
Closed-Loop Gain vs Frequency
15 TA = 25C 12 CL = 5pF A = +1 9V 6
GAIN (dB)
POWER SUPPLY REJECTION RATIO (dB)
OUTPUT IMPEDANCE ()
3 0 -3 -6 -9 -12 -15 100k 1M 10M FREQUENCY (Hz) 100M 500M VS = 3V VCM = 1V
Common Mode Rejection Ratio vs Frequency
100
COMMON MODE REJECTION RATIO (dB)
90 80
VOLTAGE GAIN (dB)
60 50 40 30 20 10 0 10k 100k 1M 10M FREQUENCY (Hz) 100M 1G
90 80 70 60 50 40 1M 10M FREQUENCY (Hz) 100M
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OVERSHOOT (%)
70
UW
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Slew Rate vs Temperature
AV = -1 RG = RF = 1k RL = 1k 750 700 650 600 550
Slew Rate vs Closed-Loop Gain
VS = 5V VO = -4V to 4V RL = 1k TA = 25C RISING
40 35
600 550 500 450 400 350 -50
RISING VS = 5V, 0V
FALLING 500 450 400
FALLING VS = 5V, 0V
125
-25
0 25 50 75 TEMPERATURE (C)
100
125
2
3 GAIN (AV)
4
5
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Output Impedance vs Frequency
1000 VS = 5V, 0V TA = 25C 90 80 70 60 50 40 30 20 10
Power Supply Rejection Ratio vs Frequency
VS = 5V, 0V TA = 25C
VS = 5V VCM = 0V
100 AV = 10 10 AV = 2 AV = 1
+PSRR
-PSRR
1
0.1 100k
1M
10M FREQUENCY (Hz)
100M
500M
0 10k
100k
1M 10M FREQUENCY (Hz)
100M
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Channel Separation vs Frequency
120 VS = 5V LT6206 CH A-B 110 LT6207 CH A-D, CH B-C T = 25C 100 A 40 35 30 25 20 15 10 5 0
Series Output Resistor vs Capacitive Load
VS = 5V, 0V AV = 1 TA = 25C RS = 10, RL =
VS = 5V TA = 25C
RS = 20, RL =
RL = RS = 50
10
100 CAPACITIVE LOAD (pF)
1000
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LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS
Series Output Resistor vs Capacitive Load
40 35 30 OVERSHOOT (%) 25 20 15 10 RL = RS = 50 5 0 10 100 CAPACITIVE LOAD (pF) 1000
620567 G28
OUTPUT VOLTAGE SWING (VP-P)
VS = 5V, 0V AV = 2 TA = 25C
RS = 10, RL =
6 5 4 3 2 1 VS = 5V TA = 25C HD2, HD3 < -30dBc 1 10 FREQUENCY (MHz) 100
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DISTORTION (dB)
RS = 20, RL =
Distortion vs Frequency
-30 -40 -50 -60 -70 -80 -90 RL = 1k, 3RD -100 0.01 0.1 1 FREQUENCY (MHz) 10
620567 G32
AV = +2 VO = 2VP-P VS = 5V, 0V RL = 1k, 2ND
DISTORTION (dB)
DISTORTION (dB)
DISTORTION (dB)
RL = 150, 2ND RL = 150, 3RD
Large Signal Response VS = 5V, 0V
500mV/DIV
50mV/DIV
0V VS = 5V, 0V AV = 1 RL = 150 50ns/DIV
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8
UW
Maximum Undistorted Output Signal vs Frequency
10 9 8 7 AV = 2 AV = -1 -30 -40 -50 -60
Distortion vs Frequency
AV = +1 VO = 2VP-P VS = 5V, 0V RL = 1k, 2ND
RL = 150, 3RD -70 -80 -90 RL = 1k, 3RD -100 0.01 0.1 1 FREQUENCY (MHz) 10
620567 G31
RL = 150, 2ND
0 0.1
Distortion vs Frequency
-30 -40 -50 -60 RL = 150, 2ND -70 -80 -90 -100 0.01 RL = 1k, 2ND RL = 1k, 3RD 0.1 1 FREQUENCY (MHz) 10
620567 G33
Distortion vs Frequency
-30 -40 AV = +2 VO = 2VP-P VS = 5V RL = 150, 3RD
AV = +1 VO = 2VP-P VS = 5V RL = 150, 3RD
-50 RL = 150, 2ND -60 -70 -80 -90 RL = 1k, 2ND -100 0.01 RL = 1k, 3RD 10
620567 G34
0.1 1 FREQUENCY (MHz)
Small Signal Response VS = 5V, 0V
2.5V
VS = 5V, 0V AV = 1 RL = 150
50ns/DIV
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LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS
Large Signal Response VS = 5V Small Signal Response VS = 5V
VIN (1V/DIV) 0V VOUT (2V/DIV) 0V 0V VS = 5V, 0V AV = 2 100ns/DIV
620567 G39
0V
VS = 5V AV = 1 RL = 150
50mV/DIV
1V/DIV
50ns/DIV
620567 G37
APPLICATIO S I FOR ATIO
I1
Q2 V+ DESD1 +IN DESD2 V- V+ DESD3 -IN DESD4 V- RIN 150 D2 D4 D1 D3 RIN 150 Q1
Q3 R1
Q4
Figure 1. Simplified Schematic
U
W
UW
Output-Overdrive Recovery
VS = 5V AV = 1 RL = 150
50ns/DIV
620567 G38
UU
V+ I2 I3 R2 R3 Q13
Q9 Q5 Q7
Q10
CM DESD5
V+
Q6
Q8 Q11 Q12
COMPLEMENTARY DRIVE GENERATOR
OUT DESD6 V-
Q14 I4 R4 R5 V-
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LT6205/LT6206/LT6207
APPLICATIO S I FOR ATIO
Amplifier Characteristics Figure 1 shows a simplified schematic of the LT6205/ LT6206/LT6207. The input stage consists of transistors Q1 to Q8 and resistor R1. This topology allows for high slew rates at low supply voltages. The input common mode range extends from ground to typically 1.75V from VCC, and is limited by 2 VBEs plus a saturation voltage of a current source. There are back-to-back series diodes, D1 to D4, across the + and - inputs of each amplifier to limit the differential voltage to 1.4V. RIN limits the current through these diodes if the input differential voltage exceeds 1.4V. The input stage drives the degeneration resistors of PNP and NPN current mirrors, Q9 to Q12, which convert the differential signals into a single-ended output. The complementary drive generator supplies current to the output transistors that swing from rail-to-rail. The current generated through R1, divided by the capacitor CM, determines the slew rate. Note that this current, and hence the slew rate, are proportional to the magnitude of the input step. The input step equals the output step divided by the closed loop gain. The highest slew rates are therefore obtained in the lowest gain configurations. The Typical Performance Characteristic Curve of Slew Rate vs Closed Loop Gain shows the details. ESD The LT6205/LT6206/LT6207 have reverse-biased ESD protection diodes on all inputs and outputs as shown in Figure 1. If these pins are forced beyond either supply unlimited current will flow through these diodes. If the current is transient, and limited to 25mA or less, no damage to the device will occur. Layout and Passive Components With a gain bandwidth product of 100MHz and a slew rate of 450V/s the LT6205/LT6206/LT6207 require special attention to board layout and supply bypassing. Use a ground plane, short lead lengths and RF-quality low ESR supply bypass capacitors. The positive supply pin should be bypassed with a small capacitor (typically 0.01F to 0.1F) within 0.25 inches of the pin. When driving heavy loads, an additional 4.7F electrolytic capacitor should be used. When using split supplies, the same is true for the
10
U
negative supply pin. For optimum performance all feedback components and bypass capacitors should be contained in a 0.5 inch by 0.5 inch area. This helps ensure minimal stray capacitances. The parallel combination of the feedback resistor and gain setting resistor on the inverting input can combine with the input capacitance to form a pole which can degrade stability. In general, use feedback resistors of 1k or less. Capacitive Load The LT6205/LT6206/LT6207 are optimized for wide bandwidth video applications. They can drive a capacitive load of 20pF in a unity-gain configuration. When driving a larger capacitive load, a resistor of 10 to 50 should be connected between the output and the capacitive load to avoid ringing or oscillation. The feedback should still be taken from the output pin so that the resistor will isolate the capacitive load and ensure stability. The Typical Performance Curves show the output overshoot when driving a capacitive load with different series resistors. Video Signal Characteristics Composite video is the most commonly used signal in broadcast-grade products and includes Luma (or luminance, the intensity information), Chroma (the colorimetry information) and Sync (vertical and horizontal raster timing) elements combined into a single signal, NTSC and PAL being the common formats. Component video for entertainment systems include separate signal(s) for the Luma and Chroma (i.e. Y/C or YPbPr) with Sync generally applied to the Luma channel (Y signal). In some instances, native RGB signals (separate intensity information for each primary color: red, green, blue) will have Sync included as well. All the signal types that include Sync are electrically similar from a voltage-swing standpoint, though various timing and bandwidth relationships exist depending on the applicable standard. The typical video waveforms that include Sync (including full composite) are specified to have nominal 1VP-P amplitude. The lower 0.3V is reserved for "sync tips" that carry timing information, and by being at a lower potential than all the other information, represents blacker-than-black intensity, thereby causing scan retrace activity to be
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LT6205/LT6206/LT6207
APPLICATIO S I FOR ATIO
invisible on a CRT. The "black" level of the waveform is at (or "setup" very slightly above) the upper limit of the sync information. Waveform content above the black-level is intensity information, with peak brightness represented at the maximum signal level. In the case of composite video, the modulated color subcarrier is superimposed on the waveform, but the dynamics remain inside the 1VP-P limit (a notable exception is the chroma ramp used for differential-gain and differential-phase measurements, which can reach 1.15VP-P). DC-Coupled Video Amplifier Considerations Typically video amplifiers drive cables that are series terminated ("back-terminated") at the source and loadterminated at the destination with resistances equal to the cable characteristic impedance, Z0 (usually 75). This configuration forms a 2:1 resistor divider in the cabling that must be accounted for in the driver amplifier by delivering 2VP-P output into an effective 2 * Z0 load (e.g. 150). Driving the cable can require more than 13mA while the output is approaching the saturation-limits of the amplifier output. The absolute minimum supply is: VMIN = 2 + VOH +VOL. For example, the LT6206 dual operating on 3.3V as shown on the front page of this datasheet, with exceptionally low VOH 0.5V and VOL 0.35V, provides a design margin of 0.45V. The design margin must be large enough to include supply variations and DC bias accuracy for the DC-coupled video input. Handling AC-Coupled Video Signals AC-coupled video inputs are intrinsically more difficult to handle than those with DC-coupling because the average signal voltage of the video waveform is effected by the picture content, meaning that the black-level at the amplifier "wanders" with scene brightness. The wander is measured as 0.56V for a 1VP-P NTSC waveform changing from black-field to white-field and vice-versa, so an additional 1.12V allowance must be made in the amplifier supply (assuming gain of 2, so VMIN = 3.12 + VOH +VOL). For example, an LT6205 operating on 5V has a conserva-
U
tive design margin of 1.03V. The amplifier output (for gain of 2) must swing +1.47V to -1.65V around the DCoperating point, so the biasing circuitry needs to be designed accordingly for optimal fidelity. Clamped AC-Input Cable Driver A popular method of further minimizing supply requirements with AC-coupling is to employ a simple clamping scheme as shown in Figure 2. In this circuit, the LT6205 operates from 3.3V by having the sync-tips control the charge on the coupling capacitor C1, thereby reducing the black-level input wander to 0.07V. The only minor drawback to this circuit is the slight sync-tip compression ( 0.025V at input) due to the diode conduction current, though the picture content remains full fidelity. This circuit has nearly the design margin of its DC-coupled counterpart, at 0.31V (for this circuit, VMIN = 2.14 + VOH +VOL). The clamp-diode anode bias is selected to set the sync-tip output voltage at or slightly above VOL. YPbPr to RGB Component-Video Converter The back-page application uses the LT6207 quad to implement a minimum amplifier count topology to transcode consumer component-video into RGB. In this circuit, signals only pass through one active stage from any input to any output, with passive additions being performed by the cable back-termination resistors. The compromise in using passive output addition is that the amplifier outputs must be twice as large as that of a conventional cable driver. The Y-channel section also has the demanding requirement that it single-handedly drives all three outputs to full brightness during times of white content, so a helper current source is used to assure unclipped video when operating from 5V supplies. This circuit maps sync-on-Y to sync on all the RGB channels, and for best results should have input black-levels at 0V nominal to prevent clipping.
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LT6205/LT6206/LT6207
TYPICAL APPLICATIO U
3.3V 1k 1k 2.4k 0.1F 75 VIDEO OUT 75 5 LT6205 3 1 4 C1 4.7F COMPOSITE VIDEO IN 1VP-P BAT54 10k C2 4.7F 470 IS 19mA
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2
Figure 2. Clamped AC-Input Video Cable Driver
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LT6205/LT6206/LT6207
PACKAGE DESCRIPTIO U
S5 Package 5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 - 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 - 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 - 0.90 0.20 BSC 1.00 MAX DATUM `A' 0.01 - 0.10 1.90 BSC
S5 TSOT-23 0302
3.85 MAX 2.62 REF
0.30 - 0.50 REF 0.09 - 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
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LT6205/LT6206/LT6207
PACKAGE DESCRIPTIO U
MS8 Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 0.127 (.035 .005) 3.20 - 3.45 (.126 - .136)
5.23 (.206) MIN
0.42 0.038 (.0165 .0015) TYP
0.65 (.0256) BSC
3.00 0.102 (.118 .004) (NOTE 3)
8
7 65
0.52 (.0205) REF
RECOMMENDED SOLDER PAD LAYOUT DETAIL "A" 0 - 6 TYP 4.90 0.152 (.193 .006) 3.00 0.102 (.118 .004) (NOTE 4)
0.254 (.010) GAUGE PLANE
0.53 0.152 (.021 .006) DETAIL "A" 0.18 (.007) SEATING PLANE
1 1.10 (.043) MAX
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4 0.86 (.034) REF
0.65 (.0256) NOTE: BSC 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.22 - 0.38 (.009 - .015) TYP
0.127 0.076 (.005 .003)
MSOP (MS8) 0603
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LT6205/LT6206/LT6207
PACKAGE DESCRIPTIO U
GN Package 16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
.045 .005 .189 - .196* (4.801 - 4.978) 16 15 14 13 12 11 10 9 .009 (0.229) REF .150 - .165 .229 - .244 (5.817 - 6.198) .0165 .0015 .150 - .157** (3.810 - 3.988) .0250 TYP 1 .015 .004 x 45 (0.38 0.10) .007 - .0098 (0.178 - 0.249) .016 - .050 (0.406 - 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0 - 8 TYP .053 - .068 (1.351 - 1.727) 23 4 56 7 8 .004 - .0098 (0.102 - 0.249) .008 - .012 (0.203 - 0.305) .0250 (0.635) BSC
GN16 (SSOP) 0502
.254 MIN
RECOMMENDED SOLDER PAD LAYOUT
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LT6205/LT6206/LT6207
TYPICAL APPLICATIO U
YPBPR to RGB Converter
CMPD6001S 5V 36 FMMT3906 4.7k 4 1F 150 R 165 499 1 2 16 15 499 150 Y 75 5 3 B 107 150 75 150 75
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LT6207
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14
+ -
13
+ -
12
80.6
6 365 PB 95.3 174 499 7
11 499 10 150 150 G 75
PR 133 F3dB 40MHz IS 60mA BLACK LEVELS 0V R = Y + 1.4 * PR B = Y + 1.8 * PB G = Y - 0.34 * PB - 0.71 * PR
1F -5V
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RELATED PARTS
PART NUMBER LT1253/LT1254 LT1675 LT1809/LT1810 LT6550/LT6551 LT6552 DESCRIPTION Low Cost Dual and Quad Video Amplifiers RGB Multiplexer with Current Feedback Amplifiers Single/Dual, 180MHz, Rail-to-Rail Input and Output Amplifiers 3.3V Triple and Quad Video Amplifiers 3.3V Single Supply Video Difference Amplifier COMMENTS -3dB Bandwidth = 90MHz, Current Feedback 0.1dB Flatness to 100MHz, 80mA Output Drive -3dB Bandwidth = 250MHz, 100MHz Pixel Switching 350V/s Slew Rate, Shutdown, Low Distortion -90dBc at 5MHz Internal Gain of 2, 110MHz -3dB Bandwidth, Input Common Modes to Ground Differential or Single-Ended Gain Block, 600V/s Slew Rate, Input Common Modes to Ground LT1395/LT1396/LT1397 Single Dual Quad 400MHz Current Feedback Amplifiers
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
q
LT/TP 1003 1K * PRINTED IN USA
FAX: (408) 434-0507 q www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2003

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