Linear Technology LT1227 Datasheet

LT1227

140MHz Video Current

Feedback Amplifier

EATU

F

■

140MHz Bandwidth: AV = 2, R

■

1100V/µs Slew Rate

■

Low Cost

■

30mA Output Drive Current

■

0.01% Differential Gain

■

0.01° Differential Phase

■

High Input Impedance: 14MΩ, 3pF

■

Wide Supply Range: ±2V to ±15V

■

Shutdown Mode: IS < 250µA

■

Low Supply Current: IS = 10mA

■

Inputs Common Mode to Within 1.5V of Supplies

■

Outputs Swing Within 0.8V of Supplies

PPLICATI

A

■

Video Amplifiers

■

Cable Drivers

■

RGB Amplifiers

■

Test Equipment Amplifiers

■

50Ω Buffers for Driving Mixers

RE

S

O

U
S

= 150Ω

L

DUESCRIPTIO

The LT1227 is a current feedback amplifier with wide
bandwidth and excellent video characteristics. The low
differential gain and phase, wide bandwidth, and 30mA
output drive current make the LT1227 well suited to drive
cables in video systems.

A shutdown feature switches the device into a high imped­ance, low current mode, allowing multiple devices to be
connected in parallel and selected. Input to output isola­tion in shutdown is 70dB at 10MHz for input amplitudes up
to 10V
or open drain logic and takes only 4µ s to enable or disable.

The LT1227 comes in the industry standard pinout and
can upgrade the performance of many older products. For
a dual or quad version, see the LT1229/1230 data sheet.

The LT1227 is manufactured on Linear Technology’s
proprietary complementary bipolar process.

. The shutdown pin interfaces to open collector

P-P

U

O

A

PPLICATITYPICAL

Video Cable Driver Differential Gain and Phase

vs Supply Voltage

0.20

V

IN

+

LT1227

–

RF
1k

RG
1k

V

OUT

V

IN

= 1

75Ω



75Ω
CABLE

V

OUT

75Ω



1227 TA01

NTSC COMPOSITE
f = 3.58MHz

0.16

0.12

0.08

DIFFERENTIAL PHASE (DEG)

0.04

0

5

∆φ

∆G

7

9

SUPPLY VOLTAGE (±V)

11

13

LT1227 • TA02

0.20

0.16

DIFFERENTIAL GAIN (%)

0.12

0.08

0.04

0

15

1

LT1227

A

W

O

LUTEXI T

S

A

WUW

ARB

U
G

I

S

Supply Voltage ..................................................... ±18V

Input Current ...................................................... ±15mA

Output Short Circuit Duration (Note 1) ........ Continuous

Operating Temperature Range

LT1227C.................................................. 0°C to 70°C

LT1227M ......................................... – 55°C to 125°C

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

Junction Temperature

Plastic Package ................................................ 150°C

Ceramic Package ............................................. 175°C

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

/

TOP VIEW

= 175°C, θ

150°C, θ

TOP VIEW

S8 PACKAGE

150°C, θ

O

RDER I FOR ATIO

8

SHUTDOWN

+

7



V

6

OUT
NULL

N8 PACKAGE

8-LEAD PLASTIC DIP

100°C/W (J)

JA =

100°C/W (N)

JA =

8

SHUTDOWN

+

7



V

6

OUT
NULL

150°C/W

JA =

PACKAGE

1

NULL

2

–IN

3

+IN

–

V

45

J8 PACKAGE

8-LEAD CERAMIC DIP

T

JMAX

T

JMAX =

1

NULL

2

–IN

3

+IN

–

V

45

8-LEAD PLASTIC SO

T

JMAX =

Consult factory for Industrial grade parts.

WU

ORDER PART

NUMBER

LT1227MJ8
LT1227CN8

LT1227CS8

S8 PART MARKING

1227

U

LECTRICAL C CHARA TERIST

E

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

+ Noninverting Input Current T

I

IN

– Inverting Input Current T

I

IN

e

n

+i

n

–i

n

R

IN

C

IN

CMRR Common-Mode Rejection Ratio VS = ±15V, VCM = ±13V, TA = 25°C5562 dB

Input Offset Voltage TA = 25°C ±3 ±10 mV

Input Offset Voltage Drift ● 10 µV/°C

Input Noise Voltage Density f = 1kHz, RF = 1k, RG = 10Ω, RS = 0Ω 3.2 nV/√Hz
Noninverting Input Noise Current Density f = 1kHz 1.7 pA/√Hz
Inverting Input Noise Current Density f = 1kHz 32 pA/√Hz
Input Resistance VIN = ±13V, VS = ±15V ● 1.5 14 MΩ

Input Capacitance 3pF
Input Voltage Range VS = ±15V, TA = 25°C ±13 ±13.5 V

Inverting Input Current V
Common-Mode Rejection VS = ±15V, VCM = ±12V ● 10 µA/V

ICS

VCM = 0, ±5V ≤ VS ≤ ±15V, pulse tested, unless otherwise noted.

● ±15 mV

= 25°C ±0.3 ±3 µA

A

= 25°C ±10 ±60 µA

A

VIN = ±3V, VS = ±5V ● 1.5 11 MΩ

= ±5V, TA = 25°C ±3 ±3.5 V

V

S

= ±15V, VCM = ±12V ● 55 dB

V

S

= ±5V, VCM = ±3V, TA = 25°C5561dB

V

S

V

= ±5V, VCM = ±2V ● 55 dB

S

= ±15V, VCM = ±13V, TA = 25°C 3.5 10 µA/V

S

= ±5V, VCM = ±3V, TA = 25°C 4.5 10 µA/V

V

S

VS = ±5V, VCM = ±2V ● 10 µA/V

● ±10 µA

● ±100 µA

● ±12 V

● ±2V

2

LT1227

LECTRICAL C CHARA TERIST

E

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

PSRR Power Supply Rejection Ratio VS = ±2V to ±15V, TA = 25°C6080dB

Noninverting Input Current VS = ±2V to ±15V, TA = 25°C250nA/V
Power Supply Rejection VS = ±3V to ±15V ● 50 nA/ V

Inverting Input Current VS = ±2V to ±15V, TA = 25°C 0.25 5 µA/V
Power Supply Rejection VS = ±3V to ±15V ● 5 µA/V

A

V

R

OL

V

OUT

I

OUT

I

S

I

8

SR Slew Rate (Notes 4 and 5) TA = 25°C 500 1100 V/µs
tr, t

f

BW Small-Signal Bandwidth VS = ±15V, RF = 1k, RG = 1k, RL = 150Ω 140 MHz
tr, t

f

t

S

Large-Signal Voltage Gain VS = ±15V, V

Transresistance, ∆V

Maximum Output Voltage Swing VS = ±15V, RL = 400Ω, TA = 25°C ±12 ±13.5 V

Maximum Output Current RL = 0Ω, TA = 25°C3060mA
Supply Current (Note 2) VS = ±15V, V

Positive Supply Current, Shutdown V

Shutdown Pin Current (Note 3) VS = ±15V ● 300 µA
Output Leakage Current, Shutdown VS = ±15V, Pin 8 Voltage = 0V, TA = 25°C10µA

Rise and Fall Time, V

Small-Signal Rise and Fall Time VS = ±15V, RF = 1k, RG = 1k, RL = 100Ω 3.3 ns
Propagation Delay VS = ±15V, RF = 1k, RG = 1k, RL = 100Ω 3.4 ns
Small-Signal Overshoot VS = ±15V, RF = 1k, RG = 1k, RL = 100Ω 5%
Settling Time 0.1%, V
Differential Gain (Note 6) VS = ±15V, RF = 1k, RG = 1k, RL = 150Ω 0.014 %

Differential Phase (Note 6) VS = ±15V, RF = 1k, RG = 1k, RL = 150Ω 0.010 DEG

OUT

OUT

/∆I

= 1V

– V

IN

P-P

ICS

V

S

VS = ±5V, V

S

VS = ±5V, V

VS = ±5V, RL = 150Ω, TA = 25°C ±3 ±3.7 V

S

VS = ±5V, RF = 1k, RG = 1k, RL = 150Ω 8.7 ns

VS = ±15V, RF = 1k, RG = 1k, RL = 1k 0.010 %

VS = ±15V, RF = 1k, RG = 1k, RL = 1k 0.013 DEG

VCM = 0, ±5V ≤ VS ≤ ±15V, pulse tested, unless otherwise noted.

= ±3V to ±15V ● 60 dB

= ±10V, RL = 1k ● 55 72 dB

OUT

= ±2V, RL = 150Ω ● 55 72 dB

OUT

= ±15V, V

= ±15V, Pin 8 Voltage = 0V, TA = 25°C 120 300 µA

= ±10V, RL = 1k ● 100 270 kΩ

OUT

= ±2V, RL = 150Ω ● 100 240 kΩ

OUT

● ±10 V

● ±2.5 V

= 0V, TA = 25°C 10 15.0 mA

OUT

= 10V, RF = 1k, RG = 1k, RL = 1k 50 ns

OUT

● 17.5 mA

● 500 µA

The ● denotes specifications which apply over the operating temperature
range.

Note 1: A heat sink may be required depending on the power supply
voltage.

Note 2: The supply current of the LT1227 has a negative temperature
coefficient. For more information, see Typical Performance Characteristics
curves.

Note 3: Ramp pin 8 voltage down from 15V while measuring I
drops to less than 0.5mA, measure pin 8 current.

. When I

S

S

Note 4: Slew rate is measured at ±5V on a ±10V output signal while

operating on ±15V supplies with RF = 2k, RG = 220Ω and RL = 400Ω.

Note 5: AC parameters are 100% tested on the ceramic and plastic DIP
package parts (J and N suffix) and are sample tested on every lot of the SO
packaged parts (S suffix).

Note 6: NTSC composite video with an output level of 2V.

3

LT1227

SUPPLY VOLTAGE (±V)

0

0

–3dB BANDWIDTH (MHz)

20

60

80

100

140

4

8

10 18

LT1227 • TPC06



40

160

180

120

26

12

14

16

PEAKING ≤ 0.5dB
PEAKING ≤ 5dB

RF = 500Ω

RF = 750Ω

RF = 2k

RF = 1k

SUPPLY VOLTAGE (±V)

0

0

–3dB BANDWIDTH (MHz)

2

6

8

10

14

4

8

10 18

LT1227 • TPC09

4

16

18

12

26

12

14

16

RF = 500Ω

RF = 2k

RF = 1k

LPER

F

O

R

ATYPICA

UW

CCHARA TERIST

E

C

ICS

Voltage Gain and Phase vs
Frequency, Gain = 6dB

10

PHASE

9
8
7
6

GAIN

5
4

VOLTAGE GAIN (dB)

3
2

VS = ±15V

= 100Ω

R

L

1

= 910Ω

R

F

0

0.1

1 10 100

FREQUENCY (MHz)

Voltage Gain and Phase vs
Frequency, Gain = 20dB

24

PHASE

23
22
21
20

GAIN

19
18

VOLTAGE GAIN (dB)

17
16

VS = ±15V

= 100Ω

R

L

15

= 825Ω

R

F

14

0.1

1 10 100

FREQUENCY (MHz)

LT1227 • TPC01

LT1227 • TPC04

0

PHASE SHIFT (DEG)

45
90
135
180

225

0

PHASE SHIFT (DEG)

45
90
135
180

225

–3dB Bandwidth vs Supply
Voltage, Gain = 2, RL = 100Ω

180

160

140

120

100

80

60

–3dB BANDWIDTH (MHz)

40

20

0

PEAKING ≤ 0.5dB
PEAKING ≤ 5dB

RF = 500Ω

RF = 750Ω

0

26

4

SUPPLY VOLTAGE (±V)

10 18

8

–3dB Bandwidth vs Supply
Voltage, Gain = 10, RL = 100Ω

180

160

140

120

100

80

60

–3dB BANDWIDTH (MHz)

40

20

0

PEAKING ≤ 0.5dB
PEAKING ≤ 5dB

RF = 250Ω

0

4

26

SUPPLY VOLTAGE (±V)

10 18

8

RF = 1k

RF = 2k

14

12

RF = 500Ω

RF = 750Ω

RF = 1k

RF = 2k

14

12

16

LT1227 • TPC02

16

LT1227 • TPC05

–3dB Bandwidth vs Supply
Voltage, Gain = 2, RL = 1k

180

160

140

120

100

80

60

–3dB BANDWIDTH (MHz)

40

20

0

PEAKING ≤ 0.5dB
PEAKING ≤ 5dB

RF = 750Ω

0

26

4

SUPPLY VOLTAGE (±V)

RF = 1.5k

RF = 1k

8

–3dB Bandwidth vs Supply
Voltage, Gain = 10, RL = 1k

= 2k

R

F

14

10 18

12

16

LT1227 • TPC03

44
43
42
41
40

39
38

VOLTAGE GAIN (dB)

37
36
35
34

0.1

4

Voltage Gain and Phase vs
Frequency, Gain = 40dB

PHASE

GAIN

VS = ±15V

= 100Ω

R

L

= 500Ω

R

F

1 10 100

FREQUENCY (MHz)

LT1227 • TPC07

0

PHASE SHIFT (DEG)

45
90
135
180

225

–3dB Bandwidth vs Supply
Voltage, Gain = 100, RL = 100Ω

18

16

14

12

10

8

6

–3dB BANDWIDTH (MHz)

4

2

0

0

26

RF = 500Ω

4

SUPPLY VOLTAGE (±V)

10 18

8

12

RF = 1k

RF = 2k

14

16

LT1227 • TPC08

–3dB Bandwidth vs Supply
Voltage, Gain = 100, RL = 1k