LINEAR TECHNOLOGY LT6205, LT6206, LT6207 Technical data

FEATURES

■

450V/µs 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: –40°C to 85°C

■

Single in SOT-23, Dual in MSOP,
Quad in SSOP Package

U

APPLICATIO S

■

Video Line Driver

■

Automotive Displays

■

RGB Amplifiers

■

Coaxial Cable Drivers

■

Low Voltage High Speed Signal Processing

LT6205/LT6206/LT6207

Single/Dual/Quad

Single Supply 3V,

100MHz Video Op Amps

U

DESCRIPTIO

The LT®6205/LT6206/LT6207 are low cost single/dual/
quad voltage feedback amplifiers that feature 100MHz
gain-bandwidth product, 450V/µs 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.

TYPICAL APPLICATIO

Baseband Video Splitter/Cable Driver

3.3V

499Ω 499Ω

2

V

3

IN

75Ω

5

6

499Ω 499Ω

1µF

8

LT6206

–

+

+

–

1

7

4

75Ω

75Ω

F

3dB

≤ 25mA

I

S

U

≈ 50MHz

75Ω

75Ω

620567 TA01a

Output Step Response

V

V

OUT1

V

OUT2

OUT

V

0V

IN

0V

V

= 3.3V

S

= 0.1V TO 1.1V

V

IN

f = 10MHz

20ns/DIV

620567 TA01b

620567f

1

LT6205/LT6206/LT6207

TOP VIEW

GN PACKAGE

16-LEAD NARROW PLASTIC SSOP

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

OUT A

–IN A
+IN A

V

+

+IN B
–IN B

OUT B

NC

OUT D
–IN D
+IN D
V

–

+IN C
–IN C
OUT C
NC

C

–

+

D

+

–

B

–

+

A

+

–

WW

W

U

ABSOLUTE AXI U RATI GS

(Note 1)

Total Supply Voltage (V+ to V–)............................ 12.6V

Input Current ...................................................... ±10mA

Input Voltage Range (Note 2) ...................................±V

Output Short-Circuit Duration (Note 3)............ Indefinite

Pin Current While Exceeding Supplies (Note 9) .. ±25mA

UUW

PACKAGE/ORDER I FOR ATIO

TOP VIEW

OUT 1

–

V

2

+IN 3

5-LEAD PLASTIC SOT-23

T

JMAX

–

+

S5 PACKAGE

= 150°C, θJA = 250°C/W

5 V

4 –IN

+

OUT A

1

–IN A

2

+IN A

3

–

V

4

MS8 PACKAGE

8-LEAD PLASTIC MSOP

T

= 150°C, θJA = 250°C/W

JMAX

Operating Temperature Range .................–40°C to 85°C

Specified Temperature Range (Note 4)....–40°C to 85°C

Storage Temperature Range ..................–65°C to 150°C

S

Maximum Junction Temperature .......................... 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

TOP VIEW

–
+

+

8

V

7

OUT B

–

6

–IN B

+

5

+IN B

ORDER PART

NUMBER

LT6205CS5
LT6205IS5

*The temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

B

I

OS

e

n

i

n

2

T

= 150°C, θJA = 135°C/W

JMAX

S5 PART

MARKING*

LTAEM

ORDER PART

NUMBER

LT6206CMS8
LT6206IMS8

MS8 PART

MARKING

LTH3
LTH4

ORDER PART

NUMBER

LT6207CGN
LT6207IGN

GN PART

MARKING

6207
6207I

The ● denotes specifications which apply over the specified temperature

= 1V, unless otherwise noted.

OUT

Input Offset Voltage 1 3.5 mV

● 5mV

Input Offset Voltage Match 13 mV
(Channel-to-Channel) (Note 5)

Input Offset Voltage Drift (Note 6) ● 715µV/°C
Input Bias Current ● 10 30 µA
Input Offset Current ● 0.6 3 µA
Input Noise Voltage 0.1Hz to 10Hz 2 µV
Input Noise Voltage Density f = 10kHz 9 nV/√Hz
Input Noise Current Density f = 10kHz 4 pA/√Hz
Input Resistance VCM = 0V to V
Input Capacitance 2pF

+

– 2V 1 MΩ

● 4mV

P-P

620567f

LT6205/LT6206/LT6207

ELECTRICAL CHARACTERISTICS

range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = V

The ● denotes specifications which apply over the specified temperature

= 1V, unless otherwise noted.

OUT

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

CMRR Common Mode Rejection Ratio VCM = 0 to V

Input Voltage Range ● 0V

+

– 2V ● 78 90 dB

+

– 2 V

PSRR Power Supply Rejection Ratio VS = 3V to 12V ● 67 75 dB

V

= V

OUT

= 0.5V

CM

Minimum Supply Voltage VCM = 0.5V ● 2.7 V

A

VOL

V

OL

V

OH

I

SC

Large-Signal Voltage Gain VS = 5V, VO = 0.5V to 4.5V, RL = 1k ● 30 100 V/mV

= 5V, VO = 1V to 3V, RL = 150Ω ● 5 20 V/mV

V

S

= 3V, VO = 0.5V to 2.5V, RL = 1k ● 20 60 V/mV

V

S

Output Voltage Swing Low (Note 7) No Load, Input Overdrive = 30mV ● 10 25 mV

= 5mA ● 75 150 mV

I

SINK

V

S

V

S

= 5V, I
= 3V, I

= 25mA ● 300 500 mV

SINK

= 15mA ● 200 350 mV

SINK

Output Voltage Swing High (Note 7) No Load, Input Overdrive = 30mV ● 60 100 mV

= 5mA ● 140 250 mV

I

SOURCE

V

S

V

S

= 5V, I
= 3V, I

= 25mA ● 650 1200 mV

SOURCE

= 15mA ● 300 500 mV

SOURCE

Short-Circuit Current VS = 5V, Output Shorted to GND 35 60 mA

● 25 mA

VS = 3V, Output Shorted to GND 30 50 mA

● 20 mA

I

S

Supply Current per Amplifier 3.75 5 mA

● 5.75 mA

GBW Gain Bandwidth Product f = 2MHz ● 65 100 MHz
SR Slew Rate VS = 5V, AV = 2, RF = RG = 1k 450 V/µs

= 1V to 4V, Measured from 1.5V to 3.5V

V

O

Channel Separation f = 10MHz 90 dB
FPBW Full Power Bandwidth V
t

S

Settling time to 3% VS = 5V, ∆V

OUT

= 2V

(Note 8) 71 MHz

P-P

= 2V, AV = –1, RL = 150Ω 15 ns

OUT

Settling time to 1% 25 ns

Differential Gain VS = 5V, AV = 2, RL = 150Ω, Output Black Level =1V 0.05 %

Differential Phase V

= 5V, AV = 2, RL = 150Ω, Output Black Level =1V 0.08 Deg

S

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. VS = ±5V;
VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

B

I

OS

= 0V, unless otherwise noted.

OUT

Input Offset Voltage 1.3 4.5 mV

● 6mV

Input Offset Voltage Match 13 mV

(Channel-to-Channel) (Note 5)

● 4mV

Input Offset Voltage Drift (Note 6) ● 10 18 µV/°C

Input Bias Current ● 18 30 µA

Input Offset Current ● 0.6 3 µA

Input Noise Voltage 0.1Hz to 10Hz 2 µV

P-P

620567f

3

LT6205/LT6206/LT6207

ELECTRICAL CHARACTERISTICS

range, otherwise specifications are at TA = 25°C. VS = ±5V; VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

e

n

i

n

CMRR Common Mode Rejection Ratio VCM = –5V to 3V ● 78 90 dB

PSRR Power Supply Rejection Ratio VS = ±2V to ±6V ● 67 75 dB
A

VOL

I

SC

I

S

GBW Gain Bandwidth Product f = 2MHz ● 65 100 MHz
SR Slew Rate AV = –1, RL = 1k 350 600 V/µs

FPBW Full Power Bandwidth V
t

S

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 0°C to 70°C and are designed, characterized and
expected to meet specified performance from –40°C to 85°C but are not
tested or QA sampled at these temperatures. The LT6205I/LT6206I/
LT6207I are guaranteed to meet specified performance from
–40°C to 85°C.

Input Noise Voltage Density f = 10kHz 9 nV/√Hz

Input Noise Current Density f = 10kHz 4 pA/√Hz

Input Resistance VCM = –5V to 3V 1 MΩ

Input Capacitance 2pF

Input Voltage Range ● –5 3 V

Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k ● 50 133 V/mV

VO = –3V to 3V, RL = 150Ω ● 7.5 20 V/mV

Output Voltage Swing No Load, Input Overdrive = 30mV ● ±4.88 ±4.92 V

I

OUT

I

OUT

Short-Circuit Current Short to Ground ±40 ±60 mA

Supply Current per Amplifier 4 5.6 mA

V

Channel Separation f = 10MHz 90 dB

Settling Time to 3% ∆V

Settling Time to 1% 25 ns

Differential Gain AV = 2, RL = 150Ω, Output Black Level = 1V 0.05 %

Differential Phase A

The ● denotes specifications which apply over the specified temperature

= 0V, unless otherwise noted.

OUT

= ±5mA ● ±4.75 ±4.85 V
= ±25mA ● ±3.8 ±4.35 V

● ±30 mA

● 6.5 mA

= –4V to 4V, Measured from –3V to 3V

O

= 8V

OUT

OUT

= 2, RL = 150Ω, Output Black Level = 1V 0.08 Deg

V

(Note 8) 14 24 MHz

P-P

= 2V, AV = –1, RL = 150Ω 15 ns

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/2πV
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.

PEAK

.

4

620567f

UW

TEMPERATURE (°C)

–50 –25 0 25 50 75 100 125

INPUT BIAS CURRENT (µA)

620567 G06

–4

–6

–5

–7

–8

–9

–10

–11

–12

VS = 5V, 0V
V

CM

= 1V

TYPICAL PERFOR A CE CHARACTERISTICS

Supply Current per Amplifier vs

VOS Distribution

40

VS = 5V, 0V

= 1V

V

CM

35

30

25

20

15

PERCENT OF UNITS (%)

10

5

0

–3–2–10123

INPUT OFFSET VOLTAGE (mV)

620567 G01

Supply Voltage Minimum Supply Voltage

5

4

3

2

1

SUPPLY CURRENT PER AMPLIFIER (mA)

0

0123456789101112

TA = 125°C

TA = 25°C

TA = –55°C

TOTAL SUPPLY VOLTAGE (V)

LT6205/LT6206/LT6207

100

0

–100

TA = –55°C

TA =125°C

TA = 25°C

TOTAL SUPPLY VOLTAGE (V)

620567 G03

620567 G02

–200

–300

–400

–500

CHANGE IN INPUT OFFSET VOLTAGE (µV)

–600

1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Change in Offset Voltage vs Input
Common Mode Voltage

1000

VS = 5V, 0V

800

600

400

TA = 25°C

200

OFFSET VOLTAGE CHANGE (µV)

0

TA =125°C

012345

INPUT COMMON MODE VOLTAGE (V)

Output Saturation Voltage vs
Load Current (Output Low)

10

VS = 5V, 0V

= 30mV

V

OD

1

0.1

OUTPUT SATURATION VOLTAGE (V)

0.01

0.01 1 10 100

0.1
LOAD CURRENT (mA)

TA = –55°C

TA = 25°C

TA = 125°C

TA = –55°C

620567 G04

620567 G07

Input Bias Current vs Input
Common Mode Voltage

–2

VS = 5V, 0V

–3
–4
–5
–6

TA = 125°C

–7
–8
–9

INPUT BIAS CURRENT (µA)

–10
–11
–12

012345

TA = 25°C

TA = –55°C

INPUT COMMON MODE VOLTAGE (V)

620567 G05

Output Saturation Voltage vs
Load Current (Output High)

10

VS = 5V, 0V

= 30mV

V

OD

1

0.1

OUTPUT SATURATION VOLTAGE (V)

0.01

0.01 1 10 100

0.1
LOAD CURRENT (mA)

TA = 125°C

TA = 25°C

TA = –55°C

620567 G08

Input Bias Current vs
Temperature

Short-Circuit Current vs
Temperature

75

SINKING

70

VS = 5V, 0V

65

V

CM

60

55

50

45

40

OUTPUT SHORT-CIRCUIT CURRENT (mA)

35

–50 –25 0 25 50 75 100 125

SOURCING

= 1V

TEMPERATURE (°C)

SINKING

SOURCING

VS = 3V, 0V
V

CM

= 1V

620567 G09

620567f

5

LT6205/LT6206/LT6207

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Short-Circuit Current vs
Temperature

90

VS = ±5V

80

70

60

50

40

OUTPUT SHORT-CIRCUIT CURRENT (mA)

3O

–50 –25 0 25 50 75 100 125

SINKING

SOURCING

TEMPERATURE (°C)

620567 G10

Open-Loop Gain Open-Loop Gain

500
400
300
200
100

0
–100
–200

INPUT VOLTAGE (µV)

–300
–400
–500

0 1.0 2.0 3.0 4.00.5 1.5 2.5 3.5 4.5 5.0

RL = 1k

RL = 150Ω

OUTPUT VOLTAGE (V)

VS = 5V, 0V
V

CM

T

A

= 1V

= 25°C

620567 G11

500
400
300
200
100

0
–100
–200

INPUT VOLTAGE (µV)

–300
–400
–500

–5 –3 –1 1 3–4 –2 0 2 4 5

OUTPUT VOLTAGE (V)

RL = 150Ω

VS = ±5V

= 25°C

T

A

RL = 1k

620567 G12

Warm Up Drift vs Time (LT6206)

120

100

80

60

40

20

CHANGE IN OFFSET VOLTAGE (µV)

0

0 2040608010 30 50 70 90 100

VS = ±5V

VS = 5V, 0V

TIME AFTER POWER-UP (s)

0.1Hz to 10Hz Noise Voltage

VS = 5V, 0V

= 1V

V

CM

= 25°C

T

A

NOISE VOLTAGE (1µV/DIV)

TIME (2 SEC/DIV)

TA = 25°C

620567 G13

620567 G16

Input Noise Voltage Density vs
Frequency

30

VS = 5V, 0V

= 1V

V

CM

= 25°C

T

25

A

20

15

10

5

INPUT NOISE VOLTAGE DENSITY (nV/√Hz)

0

100 1k 10k 100k

FREQUENCY (Hz)

Gain and Phase vs Frequency

70

60

50

40

30

20

GAIN (dB)

10

0

TA = 25°C

= 1k

R

–10

L

= 5pF

C

L

–20

100k 10M 100M 500M

GAIN

1M

FREQUENCY (Hz)

PHASE

VS = 3V, 0V

VS = ±5V

VS = 3V, 0V

VS = ±5V

620567 G17

620567 G14

140

120

100

80

PHASE (DEG)

60

40

20

0

-20

-40

Input Noise Current Density vs
Frequency

16

VS = 5V, 0V

= 1V

V

CM

14

= 25°C

T

A

12

10

8

6

4

2

INPUT NOISE CURRENT DENSITY (pA/√Hz)

0

100 1k 10k 100k

FREQUENCY (Hz)

Gain Bandwidth and Phase
Margin vs Supply Voltage

TA = 25°C

= RG = 1k

R

F

= 5pF

C

L

110

105

GAIN BANDWIDTH (MHz)

100

95

GAIN BANDWIDTH

024681012

TOTAL SUPPLY VOLTAGE (V)

PHASE MARGIN

620567 G18

620567 G15

50

45

PHASE MARGIN (DEG)

40

35

6

620567f

UW

GAIN (AV)

2345

SLEW RATE (V/µs)

620567 G21

750

650

600

700

550

500

400

450

RISING

VS = ±5V
V

O

= –4V to 4V

R

L

= 1k

T

A

= 25°C

FALLING

TYPICAL PERFOR A CE CHARACTERISTICS

Gain Bandwidth and Phase
Margin vs Temperature

620567 G19

55
50
45

PHASE MARGIN (DEG)

40
35

RL = 1k

= 5pF

C

L

VS = 3V, 0V

120
110

GAIN BANDWIDTH (MHz)

VS = 3V, 0V

100

90
80

–50 –25 0 25 50 75 125100

VS = ±5V

PHASE MARGIN

VS = ±5V

GAIN BANDWIDTH

TEMPERATURE (°C)

Closed-Loop Gain vs Frequency Output Impedance vs Frequency

15

TA = 25°C

12

= 5pF

C

L

= +1

A

V

9
6
3
0

GAIN (dB)

–3
–6

–9
–12
–15

100k 10M 100M 500M

1M

FREQUENCY (Hz)

VS = ±5V
V

VS = 3V

= 1V

V

CM

CM

= 0V

OUTPUT IMPEDANCE (Ω)

620567 G22

Slew Rate vs Temperature Slew Rate vs Closed-Loop Gain

750

700

RISING VS = ±5V

650

FALLING VS = ±5V

600

550

RISING VS = 5V, 0V

500

SLEW RATE (V/µs)

450

FALLING VS = 5V, 0V

400

350

–50 –25 0 25 50 75 125100

1000

VS = 5V, 0V

= 25°C

T

A

100

AV = 2

10

1

0.1
100k

TEMPERATURE (°C)

AV = 10

10M 100M1M 500M

FREQUENCY (Hz)

AV = 1

AV = –1
R
R

LT6205/LT6206/LT6207

= RF = 1k

G

= 1k

L

620567 G20

Power Supply Rejection Ratio vs
Frequency

620567 G23

90

80

70

60

50

40

30

20

10

POWER SUPPLY REJECTION RATIO (dB)

+PSRR

0

10k 1M 10M 100M

100k

–PSRR

FREQUENCY (Hz)

VS = 5V, 0V

= 25°C

T

A

620567 G24

Common Mode Rejection Ratio
vs Frequency

100

90
80
70
60
50
40
30
20
10

COMMON MODE REJECTION RATIO (dB)

0

10k 1M 10M 1G

100k

FREQUENCY (Hz)

VS = ±5V

= 25°C

T

A

100M

620567 G25

Channel Separation vs Frequency

120

VS = ±5V
LT6206 CH A-B

110

LT6207 CH A-D, CH B-C

= 25°C

T

A

100

90

80

70

VOLTAGE GAIN (dB)

60

50

40

1M

10M 100M

FREQUENCY (Hz)

620567 G26

Series Output Resistor vs
Capacitive Load

40

VS = 5V, 0V

= 1

A

V

35

= 25°C

T

A

30

25

20

15

OVERSHOOT (%)

10

5

0

10

RS = 20Ω, RL = ∞

RL = RS = 50Ω

CAPACITIVE LOAD (pF)

RS = 10Ω, RL = ∞

100 1000

620567 G27

620567f

7

LT6205/LT6206/LT6207

FREQUENCY (MHz)

0.01 0.1 1 10

DISTORTION (dB)

–30

–40

–50

–60

–70

–80

–90

–100

620567 G31

AV = +1
V

O

= 2V

P–P

VS = 5V, 0V

RL = 1k, 2ND

RL = 1k, 3RD

RL = 150Ω, 3RD

RL = 150Ω, 2ND

FREQUENCY (MHz)

0.01 0.1 1 10

DISTORTION (dB)

–30

–40

–50

–60

–70

–80

–90

–100

620567 G34

AV = +2
V

O

= 2V

P–P

VS = ±5V

RL = 1k, 3RD

RL = 150Ω, 3RD

RL = 150Ω, 2ND

RL = 1k, 2ND

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Series Output Resistor vs
Capacitive Load

40

VS = 5V, 0V

= 2

A

V

35

= 25°C

T

A

30

25

20

15

OVERSHOOT (%)

10

5

0

10

RS = 20Ω, RL = ∞

RL = RS = 50Ω

CAPACITIVE LOAD (pF)

RS = 10Ω, RL = ∞

100 1000

620567 G28

Maximum Undistorted Output
Signal vs Frequency

10

9

)

8

P–P

7
6
5
4
3
2

VS = ±5V

OUTPUT VOLTAGE SWING (V

= 25°C

T

1

A

, HD3 < –30dBc

HD

2

0

0.1 1 10 100
FREQUENCY (MHz)

Distortion vs Frequency Distortion vs Frequency

–30

AV = +2

= 2V

V

O

–40

VS = 5V, 0V

–50

–60

–70

DISTORTION (dB)

–80

P–P

RL = 1k, 2ND

RL = 150Ω, 2ND

RL = 150Ω, 3RD

–30

AV = +1

= 2V

V

O

–40

VS = ±5V

–50

–60

–70

DISTORTION (dB)

–80

P–P

RL = 150Ω, 2ND

Distortion vs Frequency

AV = –1

AV = 2

620567 G30

Distortion vs Frequency

RL = 150Ω, 3RD

–90

–100

0.01 0.1 1 10

8

FREQUENCY (MHz)

RL = 1k, 3RD

620567 G32

Large Signal Response
VS = 5V, 0V

500mV/DIV

0V

VS = 5V, 0V 50ns/DIV

= 1

A

V

R

= 150Ω 620567 G35

L

–90

RL = 1k, 2ND

–100

0.01 0.1 1 10
FREQUENCY (MHz)

RL = 1k, 3RD

Small Signal Response
VS = 5V, 0V

2.5V

50mV/DIV

VS = 5V, 0V 50ns/DIV

= 1

A

V

R

= 150Ω 620567 G36

L

620567 G33

620567f

LT6205/LT6206/LT6207

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Large Signal Response VS = ±5V Small Signal Response VS = ±5V Output-Overdrive Recovery

(1V/DIV)

IN

V

0V

1V/DIV

VS = ±5V 50ns/DIV

= 1

A

V

R

= 150Ω 620567 G37

L

0V

50mV/DIV

VS = ±5V 50ns/DIV

= 1

A

V

R

= 150Ω 620567 G38

L

0V

0V

(2V/DIV)

OUT

V

VS = 5V, 0V 100ns/DIV

= 2

A

V

WUUU

APPLICATIO S I FOR ATIO

620567 G39

+IN

–IN

DESD1

DESD2

DESD3

DESD4

+

V

I1 I2 I3

+

V

R

IN

150Ω

D1

–

V

+

V

R

150Ω

–

V

D2

IN

Q2

Q1

D3

D4

Q5

Q3

R1

Q6

Q4

Q7

Q8

R2

Q9 Q10

Q11

R4 R5

I4

R3

COMPLEMENTARY

DRIVE

GENERATOR

Q12

Q13

C

M

Q14

DESD5

DESD6

+

V

OUT

–

V

–

V

620567 F01

Figure 1. Simplified Schematic

620567f

9

LT6205/LT6206/LT6207

WUUU

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/µs 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 0.01µF to

0.1µF) within 0.25 inches of the pin. When driving heavy
loads, an additional 4.7µ F electrolytic capacitor should be
used. When using split supplies, the same is true for the

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 10Ω to 50Ω 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 1V
tude. 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

P-P

ampli-

620567f

10

WUUU

APPLICATIO S I FOR ATIO

LT6205/LT6206/LT6207

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 1V
(a notable exception is the chroma ramp used for differen­tial-gain and differential-phase measurements, which can
reach 1.15V

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 75Ω). This
configuration forms a 2:1 resistor divider in the cabling
that must be accounted for in the driver amplifier by
delivering 2V
150Ω). 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: V
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 1V
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 V
For example, an LT6205 operating on 5V has a conserva-

).

P-P

output into an effective 2 • Z0 load (e.g.

P-P

NTSC waveform changing

P-P

= 3.12 + VOH +VOL).

MIN

P-P

limit

MIN

=

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, V
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.

= 2.14 + VOH +VOL). The

MIN

620567f

11

LT6205/LT6206/LT6207

U

TYPICAL APPLICATIO

3.3V

COMPOSITE

VIDEO IN 1V

P–P

C1

4.7µF

LT6205

0.1µF

5

1

2

10k

1k 1k

BAT54

C2

4.7µF

2.4k

4

3

470Ω

–

+

Figure 2. Clamped AC-Input Video Cable Driver

75Ω

I

≤ 19mA

S

VIDEO OUT

75Ω

620567 TA02

12

620567f

PACKAGE DESCRIPTIO

LT6205/LT6206/LT6207

U

S5 Package

5-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1635)

0.62
MAX

3.85 MAX

0.20 BSC

DATUM ‘A’

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

2.62 REF

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

0.30 – 0.50 REF

0.95
REF

1.22 REF

1.4 MIN

0.09 – 0.20
(NOTE 3)

2.80 BSC

1.50 – 1.75
(NOTE 4)

0.80 – 0.90

1.00 MAX

PIN ONE

0.95 BSC

2.90 BSC
(NOTE 4)

1.90 BSC

0.30 – 0.45 TYP
5 PLCS (NOTE 3)

0.01 – 0.10

S5 TSOT-23 0302

620567f

13

LT6205/LT6206/LT6207

U

PACKAGE DESCRIPTIO

MS8 Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1660)

0.889

± 0.127

(.035 ± .005)

5.23

(.206)

MIN

0.42 ± 0.038

(.0165 ± .0015)

TYP

RECOMMENDED SOLDER PAD LAYOUT

0.254

(.010)

GAUGE PLANE

0.18

(.007)

NOTE:

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

DETAIL “A”

(.126 – .136)

(.0256)

0° – 6° TYP

DETAIL “A”

3.20 – 3.45

0.65

BSC

0.53 ± 0.152
(.021 ± .006)

SEATING

PLANE

3.00 ± 0.102

(.118 ± .004)

(NOTE 3)

4.90 ± 0.152
(.193 ± .006)

(.043)

0.22 – 0.38

(.009 – .015)

TYP

1.10

MAX

8

12

0.65

(.0256)

BSC

7

6

3

5

4

0.52

(.0205)

REF

3.00 ± 0.102
(.118 ± .004)

(NOTE 4)

0.86

(.034)

REF

0.127 ± 0.076
(.005 ± .003)

MSOP (MS8) 0603

14

620567f

PACKAGE DESCRIPTIO

LT6205/LT6206/LT6207

U

GN Package

16-Lead Plastic SSOP (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1641)

.045 ±.005

.254 MIN

RECOMMENDED SOLDER PAD LAYOUT

.007 – .0098

(0.178 – 0.249)

.016 – .050

NOTE:

1. CONTROLLING DIMENSION: INCHES

2. DIMENSIONS ARE IN

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

(0.406 – 1.270)

INCHES

(MILLIMETERS)

.150 – .165

.0250 TYP.0165 ±.0015

.015 ± .004

(0.38 ± 0.10)

0° – 8° TYP

× 45°

.229 – .244

(5.817 – 6.198)

.053 – .068

(1.351 – 1.727)

.008 – .012

(0.203 – 0.305)

16

15

12

.189 – .196*

(4.801 – 4.978)

12 11 10

14

13

5

4

3

9

678

.004 – .0098

(0.102 – 0.249)

.0250

(0.635)

BSC

.009

(0.229)

REF

.150 – .157**
(3.810 – 3.988)

GN16 (SSOP) 0502

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.

620567f

15

LT6205/LT6206/LT6207

U

TYPICAL APPLICATIO

YPBPR to RGB Converter

CMPD6001S

4.7k

Y

75Ω

P

B

95.3Ω

P

R

133Ω

174Ω

36Ω

FMMT3906

499Ω165Ω

499Ω365Ω

F

3dB

≤ 60mA

I

S

BLACK LEVELS ≈ 0V

1

2

3

5

6

7

≈ 40MHz

–

+

+

–

5V

LT6207

–5V

1µF

4

13

1µF

16

15

–

14

+

12

+

11

–

10

499Ω

107Ω

80.6Ω

499Ω

R = Y + 1.4 • P
B = Y + 1.8 • P
G = Y – 0.34 • PB – 0.71 • P

150Ω

150Ω

150Ω

150Ω

150Ω

150Ω

R

B

R

R

75Ω

B

75Ω

G

75Ω

620567 TA03

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

LT1253/LT1254 Low Cost Dual and Quad Video Amplifiers –3dB Bandwidth = 90MHz, Current Feedback
LT1395/LT1396/LT1397 Single Dual Quad 400MHz Current Feedback Amplifiers 0.1dB Flatness to 100MHz, 80mA Output Drive
LT1675 RGB Multiplexer with Current Feedback Amplifiers –3dB Bandwidth = 250MHz, 100MHz Pixel Switching
LT1809/LT1810 Single/Dual, 180MHz, Rail-to-Rail Input and Output Amplifiers 350V/µs Slew Rate, Shutdown, Low Distortion –90dBc at 5MHz
LT6550/LT6551 3.3V Triple and Quad Video Amplifiers Internal Gain of 2, 110MHz –3dB Bandwidth, Input Common

Modes to Ground

LT6552 3.3V Single Supply Video Difference Amplifier Differential or Single-Ended Gain Block, 600V/µs Slew Rate,

Input Common Modes to Ground

620567f

LT/TP 1003 1K • PRINTED IN USA

16

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

[phone] ● FAX: [phone] ● www.linear.com

 LINEAR TE CHNO LOG Y CORPORATION 2003