LINEAR TECHNOLOGY LT6554 Technical data

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FEATURES

LT6554

650MHz Gain of 1

Triple Video Buffer

U

DESCRIPTIO

■

650MHz –3dB Small Signal Bandwidth

■

400MHz –3dB 2V

■

100MHz ±0.1dB Bandwidth

■

High Slew Rate: 2500V/µs

■

Fixed Gain of 1 Requires No External Resistors

■

90dB Channel Separation at 10MHz

■

60dB Channel Separation at 100MHz

■

–82dBc 2nd Harmonic Distortion at 10MHz, 2V

■

–96dBc 3rd Harmonic Distortion at 10MHz, 2V

■

Low Supply Current: 8mA per Amplifier

■

6ns 0.1% Settling Time for 2V Step

■

TTL Compatible Enable: ISS ≤ 100µA When Disabled

■

Differential Gain of 0.022%, Differential

Large Signal Bandwidth

P-P

Phase of 0.006°

■

Wide Supply Range: ±2.25V (4.5V) to ±6V (12V)

■

Available in 16-Lead SSOP Package

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APPLICATIO S

■

RGB Buffers

■

A/D Drivers

■

LCD Projectors

P-P

P-P

The LT®6554 is a high-speed triple video buffer with an
internally fixed gain of 1. The individual buffers are opti­mized for performance with a 1k load and feature a
2V

full signal bandwidth of 400MHz, making them ideal

P–P

for driving very high-resolution video signals. Separate
power supply pins for each amplifier boost channel sepa­ration to 90dB, allowing the LT6554 to excel in many high­speed applications.

While the performance of the LT6554 is optimized for dual
supply operation, it can also be used on a single supply as
low as 4.5V. Using dual 5V supplies, each amplifier draws
only 8mA. When disabled, the amplifiers draw less than
100µA and the outputs become high impedance. Further-
more, the amplifiers are capable of turning on in less than
50ns, making them suitable for multiplexing and portable
applications.

The LT6554 is manufactured on Linear Technology’s
proprietary low voltage complementary bipolar process
and is available in the 16-lead SSOP package that fits in the
same PCB area as an SO-8 package.

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

Triple Video Buffer and A/D Driver

LT6554

R

G

B

–5V

3

IN

4

5

IN

6

7

IN

8

+

–

480Ω

480Ω

–

+

480Ω

–

+

U

5V

161

152

14

1k

13

–5V

12

11

10

9

1k

5V

1k

–5V

6554 TA01a

Large Signal Transient Response

1.5
V

= 2V

OUT

P–P

VS = ±5V

= 1k

R

1.0

L

= 25°C

T

A

0.5

0

OUTPUT (V)

–0.5

–1.0

–1.5

4 8 12 16

TIME (ns)

2020 6 10 14 18

6554 TA01b

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LT6554

1

2

3

4

5

6

7

8

TOP VIEW

GN PACKAGE

16-LEAD PLASTIC SSOP

16

15

14

13

12

11

10

9

EN

DGND

INR

AGND

ING

AGND

INB

V

–

V

+

V

+

OUTR

V

–

OUTG

V

+

OUTB

V

–

G = +1

G = +1

G = +1

WW

W

ABSOLUTE AXI U RATI GS

U

UUW

PACKAGE/ORDER I FOR ATIO

(Note 1)

Total Supply Voltage (V+ to V–) ............................ 13.2V

Input Current (Note 2) ........................................ ±10mA

Output Current (Continuous) ............................. ±70mA

EN to DGND Voltage (Note 2) ................................. 5.5V

ORDER PART

NUMBER

LT6554CGN

LT6554IGN

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

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

Specified Temperature Range (Note 5) .... –40°C to 85°C

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

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

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

T

= 150°C, θJA = 135°C/W

JMAX

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, RL = 1k, CL = 1.5pF, VEN = 0.4V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

IN

e

n

i

n

R

IN

C

IN

PSRR Power Supply Rejection Ratio VS (Total) = 4.5V to 12V (Note 6) ● 51 65 dB

I

PSRR

AV ERR Gain Error V

AV MATCH Gain Matching Any One Channel to Another ±0.03 %

V

OUT

I

S

I

EN

I

SC

SR Slew Rate 4V

–3dB BW Small Signal –3dB Bandwidth V

0.1dB BW Gain Flatness ±0.1dB Bandwidth V

Offset Voltage VIN = 0V, VOS = V

Input Current ● –17 ±50 µA

Output Noise Voltage f = 100kHz 20 nV√Hz

Input Noise Current f = 100kHz 3.5 pA√Hz

Input Resistance VIN = ±1V ● 150 400 kΩ

Input Capacitance f = 100kHz 1 pF

Input Current Power Supply VS (Total) = 4.5V to 12V (Note 6) ● 1 ±5 µA/V
Rejection

Maximum Output Voltage Swing ● ±3.75 ±3.85 V

Supply Current, Per Amplifier RL = ∞ 810 mA

Supply Current, Disabled, Total VEN = 4V ● 22 100 µA

Enable Pin Current VEN = 0.4V ● –200 –95 µA

Output Short-Circuit Current RL = 0Ω, VIN = ±2V ● ±50 ±105 mA

The ● denotes the specifications which apply over the full operating

AGND

OUT

= ±2V ● –2.5 –0.6 0 %

OUT

= ∞ ● 13 mA

R

L

= Open ● 0.5 100 µA

V

EN

+

V

= V

EN

Output Step (Note 9) 1700 2500 V/µs

P-P

= 200mV

OUT

= 200mV

OUT

P-P

P-P

● ±70 mV

● 0.5 50 µA

GN PART

MARKING

6554
6554I

, V

= 0V.

DGND

11 ±35 mV

650 MHz

100 MHz

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LT6554

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at T

The ● denotes the specifications which apply over the full operating

= 25°C. VS = ±5V, RL = 1k, CL = 1.5pF, VEN = 0.4V, V

A

AGND

, V

DGND

= 0V.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

LSBW Large Signal Bandwidth V

All-Hostile Crosstalk f = 10MHz, V

t

S

tR, t

F

Settling Time 0.1% of V

Small-Signal Rise and Fall Time 10% to 90%, V

= 2V

OUT

P-P

= 4V

V

OUT

P-P

f = 100MHz, V

FINAL

(Note 7) 270 400 MHz
(Note 7) 200 MHz

= 2V

OUT

P-P

= 2V

OUT

P-P

, V

= 2V 6 ns

STEP

= 200mV

OUT

P-P

–90 dB
–60 dB

550 ps

dG Differential Gain (Note 8) 0.022 %

dP Differential Phase (Note 8) 0.006 Deg

HD2 2nd Harmonic Distortion f = 10MHz, V

HD3 3rd Harmonic Distortion f = 10MHz, V

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: This parameter is guaranteed to meet specified performance
through design and characterization. It is not production tested.

Note 3: As long as output current and junction temperature are kept below
the Absolute Maximum Ratings, no damage to the part will occur.
Depending on the supply voltage, a heat sink may be required.

Note 4: The LT6554C is guaranteed functional over the operating
temperature range of –40°C to 85°C.

Note 5: The LT6554C is guaranteed to meet specified performance from
0°C to 70°C. The LT6554C is designed, characterized and expected to
meet specified performance from –40°C and 85°C but is not tested or QA
sampled at these temperatures. The LT6554I is guaranteed to meet
specified performance from –40°C to 85°C.

OUT

OUT

= 2V

= 2V

P-P

P-P

–82 dBc

–96 dBc

Note 6: The two supply voltage settings for power supply rejection are
shifted from the typical ±V
measurement is taken at V

points for ease of testing. The first

S
+

= 3V, V– = –1.5V to provide the required 3V
headroom for the enable circuitry to function with EN, DGND, AGND and
all inputs connected to 0V. The second measurement is taken at V+ = 8V,

–

= –4V.

V
Note 7: Large signal bandwidth is calculated from the slew rate:

LSBW = SR/(π • V

P-P

)

Note 8: Differential gain and phase are measured using a Tektronix
TSG120YC/NTSC signal generator and a Tektronix 1780R video
measurement set. The resolution of this equipment is better than 0.05%
and 0.05°. Nine identical amplifier stages were cascaded giving an
effective resolution of better than 0.0056% and 0.0056°.

Note 9: Slew rate is 100% production tested on the G channel. Slew rate
of the R and B channels is guaranteed through design and
characterization.

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LT6554

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TYPICAL PERFOR A CE CHARACTERISTICS

Supply Current per Amplifier vs
Temperature

12

10

8

6

4

SUPPLY CURRENT (mA)

2

0

–35 5

–55

15.0
VS = ±5V

V

IN

12.5
TYPICAL PART

10.0

7.5

5.0

2.5

OFFSET VOLTAGE (mV)

0

–2.5

–5.0

–35 5

–55

–15

= 0V

–15

VEN = 0V

VEN = 0.4V

45 125

25

TEMPERATURE (°C)

45 125

25

TEMPERATURE (°C)

Supply Current per Amplifier vs
Supply Voltage

VS = ±5V

= ∞

R

L

= 0V

V

IN

85

105

65

6554 G01

12

10

8

6

4

SUPPLY CURRENT (mA)

2

0

+

V– = –V
VEN, V
T

04

, VIN = 0V

DGND

= 25°C

A

123

56789101112

TOTAL SUPPLY VOLTAGE (V)

6554 G02

Supply Current per Amplifier vs
EN Pin Voltage

12

10

8

TA = 125°C

6

4

SUPPLY CURRENT (mA)

2

0

0

TA = –55°C

TA = 25°C

0.5 1.5

1.0
EN PIN VOLTAGE (V)

2.0

2.5

VS = ±5V
V

DGND

= 0V

V

IN

3.0

= 0V

3.5

6554 G03

4.0

Input Bias Current vs
Input Voltage

20

VS = ±5V

0

–20

–40

INPUT BIAS CURRENT (µA)

85

105

65

6554 G04

–60

–2.5

TA = 125°C

TA = 25°C

TA = –55°C

–1.5

–0.5

INPUT VOLTAGE (V)

0.5

1.5

2.5

6554 G05

–100

EN PIN CURRENT (µA)

–120

–140

–20

–40

–60

–80

0

0

EN Pin Current vs EN Pin VoltageOffset Voltage vs Temperature

VS = ±5V
V

= 0V

DGND

TA = 125°C

1

TA = –55°C

TA = 25°C

34

2

EN PIN VOLTAGE (V)

5

6554 G06

Output Voltage vs Input Voltage

5

VS = ±5V

4

= 1k

R

L

3

2

1

0

–1

TA = –55°C

–2

OUTPUT VOLTAGE (V)

–3

–4

–5

–3.5 –1.5

–4.5

TA = 125°C

–2.5

–0.5

INPUT VOLTAGE (V)

0.5 4.5

4

1.5

TA = 25°C

2.5

3.5

6554 G07

Output Voltage Swing vs I
(Output High)

5

VS = ±5V

= 4V

V

IN

4

TA = –55°C

3

2

OUTPUT VOLTAGE (V)

1

0

102030

0

40

SOURCE CURRENT (mA)

TA = 125°C

LOAD

TA = 25°C

6554 G08

Output Voltage Swing vs I

LOAD

(Output Low)

0

VS = ±5V

= –4V

V

IN

–1

–2

–3

TA = –55°C

OUTPUT VOLTAGE (V)

–4

–5

102030

10050 60 70 80 90

040

SINK CURRENT (mA)

TA = 25°C

TA = 125°C

10050 60 70 80 90

6554 G09

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