Linear Technology LT1260, LT1259 Datasheet

FEATURES

■

90MHz Bandwidth on ±5V

■

0.1dB Gain Flatness >30MHz

■

Completely Off in Shutdown, 0µA Supply Current

■

High Slew Rate: 1600V/µs

■

Wide Supply Range: ±2V(4V) to ±15V(30V)

■

60mA Output Current

■

Low Supply Current: 5mA/Amplifier

■

Differential Gain: 0.016%

■

Differential Phase: 0.075°

■

Fast Turn-On Time: 100ns

■

Fast Turn-Off Time: 40ns

■

14-Pin and 16-Pin Narrow SO Packages

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APPLICATIO S

LT1259/LT1260

Low Cost Dual and Triple

130MHz Current Feedback

Amplifiers with Shutdown

U

DESCRIPTIO

The LT®1259 contains two independent 130MHz current
feedback amplifiers, each with a shutdown pin. These
amplifiers are designed for excellent linearity while driving
cables and other low impedance loads. The LT1260 is a
triple version especially suited to RGB video applications.
These amplifiers operate on all supplies from single 5V to
±15V and draw only 5mA per amplifier when active.

When shut down, the LT1259/LT1260 amplifiers draw
zero supply current and their outputs become high
impedance. Only two LT1260s are required to make a
complete 2-input RGB MUX and cable driver. These
amplifiers turn on in only 100ns and turn off in 40ns,
making them ideal in spread spectrum and portable
equipment applications.

■

RGB Cable Drivers

■

Spread Spectrum Amplifiers

■

MUX Amplifiers

■

Composite Video Cable Drivers

■

Portable Equipment

TYPICAL APPLICATIO

CHANNEL

A

SELECT

V

IN A

R

G

1.6k

V

IN B

R

G

1.6k

EN A

+

1/2 LT1259

–

EN B

+

1/2 LT1259

–

R

1.6k

R

1.6k

B

F

F

U

75Ω

75Ω

LT1259/60 • TA01

75Ω
CABLE

75Ω

The LT1259/LT1260 amplifiers are manufactured on
Linear Technology’s proprietary complementary bipolar
process.

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

Square Wave Response2-Input Video MUX Cable Driver

V

OUT

CABLE OUTPUT

RL = 150Ω
f = 30MHz

LT1259/50 • TA02

1

LT1259/LT1260

WWWU

ABSOLUTE AXI U RATI GS

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

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

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

Specified Temperature Range (Note 2)....... 0°C to 70°C

UU

W

PACKAGE/ORDER I FOR ATIO

TOP VIEW

1

–IN A

2

+IN A

3

GND

4

GND

5

GND

6

+IN B

7

–IN B

N PACKAGE

14-LEAD PLASTIC DIP

T

= 150°C, θJA = 70°C/W (N)

JMAX

T

= 150°C, θJA = 110°C/W (S)

JMAX

EN A

A

B

14

OUT A

13

+

V

12

GND

11

–

V

10

OUT B

9

EN B

8

S PACKAGE

14-LEAD PLASTIC SOIC

ORDER PART

NUMBER

LT1259CN
LT1259CS
LT1259IN
LT1259IS

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

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

Junction Temperature (Note 4)............................ 150°C

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

TOP VIEW

1

–IN R

2

+IN R

3

GND

4

–IN G

5

+IN G

6

GND

7

+IN B

8

–IN B

N PACKAGE

16-LEAD PLASTIC DIP

T

= 150°C, θJA = 70°C/W (N)

JMAX

= 150°C, θJA = 100°C/W (S)

T

JMAX

EN R

R

G

B

16

OUT R

15

+

V

14

EN G

13

OUT G

12

–

V

11

OUT B

10

EN B

9

S PACKAGE

16-LEAD PLASTIC SOIC

ORDER PART

NUMBER

LT1260CN
LT1260CS
LT1260IN
LT1260IS

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS

0°C ≤ TA ≤ 70°C, each amplifier VCM = 0V, ±5V ≤ VS ≤ ±15V, EN pins = 0V, pulse tested, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

I

I

e
+i
–i
R

C

C
V

IN

IN

n

OS

+

–

n
n

IN

IN

OUT
IN

Input Offset Voltage TA = 25°C212mV

● 16 mV

Input Offset Voltage Drift ● 30 µV/°C
Noninverting Input Current TA = 25°C 0.5 3 µA

● 6 µA

Inverting Input Current TA = 25°C2090µA

● 120 µA

Input Noise Voltage Density f = 1kHz, RF = 1k, RG = 10Ω, RS = 0Ω 3.6 nV/√Hz
Noninverting Input Noise Current Density f = 1kHz 1.3 pA/√Hz
Inverting Input Noise Current Density f = 1kHz 45 pA/√Hz
Input Resistance VIN = ±13V, VS = ±15V ● 217 MΩ

= ±3V, VS = ±5V ● 225 MΩ

V

IN

Input Capacitance Enabled 2 pF

Disabled 4 pF
Output Capacitance Disabled 4.4 pF
Input Voltage Range VS = ±15V, TA = 25°C ±13 ±13.5 V

● ±12 V

VS = ±5V, TA = 25°C ±3 ±3.5 V

● ±2V

2

LT1259/LT1260

LECTRICAL C CHARA TERIST

E

0°C ≤ TA ≤ 70°C, each amplifier VCM = 0V, ±5V ≤ VS ≤ ±15V, EN pins = 0V, pulse tested, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OUT

CMRR Common-Mode Rejection Ratio VS = ±15V, VCM = ±13V, TA = 25°C5569 dB

PSRR Power Supply Rejection Ratio VS = ±2V to ±15V, EN Pins at V–, TA = 25°C6080 dB

A

V

R

OL

I

OUT

I

S

SR Slew Rate (Note 6) TA = 25°C 900 1600 V/µs
t

ON

t

OFF

tr, t

f

t

S

Maximum Output Voltage Swing VS = ±15V, RL = 1k ● ±12.0 ±14.0 V

Inverting Input Current VS = ±15V, VCM = ±13V, TA = 25°C 3.5 10 µA/V
Common-Mode Rejection V

Noninverting Input Current VS = ±3V to ±15V, EN Pins at V–, TA = 25°C1565nA/V
Power Supply Rejection VS = ±3V to ±15V, EN Pins at V

Inverting Input Current VS = ±2V to ±15V, EN Pins at V–, TA = 25°C 0.1 5 µA/V
Power Supply Rejection V

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

Transresistance, ∆V

OUT

/∆I

–

IN

Maximum Output Current RL = 0Ω, TA = 25°C3060mA
Supply Current per Amplifier VS = ±15V, V

(Note 5)

Disable Supply Current per Amplifier VS = ±15V, EN Pin Voltage = 14.5V, RL = 150Ω ● 3 16.7 µA

Enable Pin Current VS = ±15V, EN Pin Voltage = 0V, TA = 25°C 60 200 µA

Turn-On Delay Time (Note 7) AV = 10, TA = 25°C 100 400 ns
Turn-Off Delay Time (Note 7) AV = 10, TA = 25°C 40 150 ns
Small-Signal Rise and Fall Time VS = ±12V, RF = RG = 1.5k, RL = 150Ω 4.2 ns
Propagation Delay VS = ±12V, RF = RG = 1.5k, RL = 150Ω 4.7 ns
Small-Signal Overshoot VS = ±12V, RF = RG = 1.5k, RL = 150Ω 5%
Settling Time 0.1%, V
Differential Gain (Note 8) VS = ±12V, RF = RG = 1.5k, RL = 150Ω 0.016 %
Differential Phase (Note 8) VS = ±12V, RF = RG = 1.5k, RL = 150Ω 0.075 DEG

ICS

VS = ±5V, RL = 150Ω, TA = 25°C ±3.0 ±3.7 V

VS = ±15V, VCM = ±12V ● 55 dB

= ±5V, VCM = ±3V, TA = 25°C5263dB

V

S

= ±5V, VCM = ±2V ● 52 dB

V

S

= ±15V, VCM = ±12V ● 10 µA/V

S

= ±5V, VCM = ±3V, TA = 25°C 4.5 15 µA/V

V

S

VS = ±5V, VCM = ±2V ● 15 µA/V

= ±3V to ±15V, EN Pins at V

V

S

= ±3V to ±15V, EN Pins at V

S

= ±10V, RL = 1k ● 57 72 dB

= ±5V, V

V

S

VS = ±15V, V
VS = ±5V, V

VS = ±5V, V

= ±15V, Sink 1µA From EN Pin ● 1 2.7 µA

V

S

OUT

= ±2V, RL = 150Ω ● 57 69 dB

OUT

= ±10V, RL = 1k ● 120 300 kΩ

OUT

= ±2V, RL = 150Ω ● 100 200 kΩ

OUT

= 0V, TA = 25°C 5.0 7.5 mA

OUT

= 0V, TA = 25°C 4.5 6.7 mA

OUT

= 10V, RF = RG = 1.5k, RL = 1k 75 ns

OUT

–

–

–

● ±2.5 V

● 60 dB

● 75 nA/V

● 5 µA/V

● 7.9 mA

● 300 µA

–40°C ≤ TA ≤ 85°C, each amplifier VCM = 0V, ±5V ≤ VS ≤ ±15V, EN pins = 0V, pulse tested, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

+

I

IN

–

I

IN

R

IN

A

V

I

S

Input Offset Voltage ● 18 mV
Noninverting Input Current ● 7 µA
Inverting Input Current ● 130 µA
Input Resistance VIN = ±3V, VS = ±5V ● 1MΩ
Large-Signal Gain ● 55 dB
Disable Supply Current per Amplifier VS = ±15V, EN Pin Voltage = 14.5V, RL = 150Ω ● 19 µA
Enable Pin Current VS = ±15V, EN Pin Voltage = 0V ● 350 µA

3

LT1259/LT1260

ELECTRICAL CHARACTERISTICS

T

he ● denotes specifications which apply over the specified operating

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

voltage and how many amplifiers have their outputs short circuited.
Note 2: Commercial grade parts are designed to operate over the

temperature range of –40°C to 85°C but are neither tested nor guaranteed
beyond 0°C to 70°C. Industrial grade parts specified and tested over
–40°C to 85°C are available on special request. Consult factory.

Note 3: Ground pins are not internally connected. For best
performance, connect to ground.

Note 4: T
power dissipation P

is calculated from the ambient temperature TA and the

J

according to the following formulas:

D

LT1259CN/LT1259IN: TJ = TA + (PD • 70°C/W)
LT1259CS/LT1259IS: T
LT1260CNLT1260IN/: T
LT1260CS/LT1260IS: T

= TA + (PD • 110°C/W)

J

= TA + (PD • 70°C/W)

J

= TA + (PD • 100°C/W)

J

Note 5: The supply current of the LT1259/LT1260 has a negative
temperature coefficient. See Typical Performance Characteristics.

Note 6: Slew rate is measured at ±5V on a ±10V output signal while
operating on ±15V supplies with R

= 1k, RG = 110Ω and RL = 1k.

F

Note 7: Turn-on delay time is measured while operating on ±5V
supplies with R

= 1k, RG = 110Ω and RL = 150Ω. The tON is measured

F

from control input to appearance of 0.5V at the output, for V
Likewise, turn-off delay time is measured from control input to
appearance of 0.5V on the output for VIN = 0.1V.

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 0.1% and 0.1°.
Six identical amplifier stages were cascaded giving an effective
resolution of 0.016% and 0.016°.

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TYPICAL AC PERFOR A CE

SMALL SIGNAL SMALL SIGNAL SMALL SIGNAL

(V) A

V

S

V

±12 2 150 1.5k 1.5k 130 53 0.1

±5 2 150 1.1k 1.1k 93 40 0

±12 10 150 1.1k 121 69 20 0.13

±5 10 150 825 90.9 61 16 0

RL (Ω)R

(Ω)R

F

(Ω) – 3dB BW (MHz) 0.1dB BW (MHz) PEAKING (dB)

G

= 0.1V.

IN

UW

TYPICAL PERFOR A CE CHARACTERISTICS

±12V Frequency Response, AV = 2

12
11
10

9
8
7

GAIN (dB)

6
5
4
3

2

1

GAIN

VS = ±12V

= 150Ω

R

L

= RG = 1.5k

R

F

PHASE

10 100

FREQUENCY (MHz)

LT1259/60 • TPC01

0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200

PHASE (DEG)

26
25
24
23
22
21

GAIN (dB)

20
19

18
17
16

±12V Frequency Response, AV = 10

VS = ±12V
R

= 150Ω

L

= 1.1k

R

F

R

= 121Ω

PHASE

GAIN

1

10 100

FREQUENCY (MHz)

G

LT1259/60 • TPC01

0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200

PHASE (DEG)

4