Linear Technology LT1497 Datasheet

FEATURES

■

Minimum Output Current: ±125mA

■

Maximum Supply Current per Amp: 7mA, VS = ±5V

■

Bandwidth: 50MHz, VS = ±15V

■

Slew Rate: 900V/µs, VS = ±15V

■

Wide Supply Range: VS = ±2.5V to ±15V
(Enhanced θJA 16-Pin SO Package)

■

Enhanced θJA SO-8 Package for ±5V Operation

■

0.02% Differential Gain: AV = 2, RL = 150Ω

■

0.015° Differential Phase: AV = 2, RL = 150Ω

■

±13V Output Swing: IL = 100mA, VS = ±15V

■

±3.1V Output Swing: IL = 100mA, VS = ±5V

■

55ns Settling Time to 0.1%, 10V Step

■

Thermal Shutdown Protection

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APPLICATIONS

■

Twisted-Pair Drivers

■

Video Amplifiers

■

Cable Drivers

■

Test Equipment Amplifiers

■

Buffers

LT1497

Dual 125mA, 50MHz

Current Feedback Amplifier

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DESCRIPTION

The LT®1497 dual current feedback amplifier features low
power, high output drive, excellent video characteristics
and outstanding distortion performance. From a low 7mA
maximum supply current per amplifier, the LT1497 drives
±100mA with only 1.9V of headroom. Twisted pairs can be
driven differentially with – 70dBc distortion up to 1MHz for
±40mA peak signals.

The LT1497 is available in a low thermal resistance 16-pin
SO package for operation with supplies up to ± 15V. For
±5V operation the device is also available in a low thermal
resistance SO-8 package. The device has thermal and
current limit circuits that protect against fault conditions.

The LT1497 is manufactured on Linear Technology’s
complementary bipolar process. The device has charac­teristics that bridge the performance between the LT1229
and LT1207 dual current feedback amplifiers. The LT1229
has 30mA output drive, 100MHz bandwidth and 12mA
supply current. The LT1207 has 250mA output drive,
60MHz bandwidth and 40mA supply current.

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

TYPICAL APPLICATION

HDSL2 Single Pair Line Driver

560Ω

560Ω

–

1/2 LT1497

+

V

IN

560Ω

560Ω

–

1/2 LT1497

+

68.1Ω

68.1Ω

1:1*

*MIDCOM 671-7807

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135Ω

1419 TA01

2nd and 3rd Harmonic Distortion of

HDSL2 Single Pair Line Driver

–40

VS = ±5V

= ±1.25V

V

IN

= ±2.5V

V

OUT

–50

–60

–70

2ND

DISTORTION (dBc)

3RD

–80

–90

100k

FREQUENCY (Hz)

1M 2M

1497 TA02

1

LT1497

WW

W

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ABSOLUTE MAXIMUM RATINGS

Total Supply Voltage (V+ to V–)

LT1497CS8.......................................................... 14V

LT1497CS............................................................ 36V

Noninverting Input Current ................................... ±2mA

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

U

W

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PACKAGE/ORDER INFORMATION

ORDER PART

TOP VIEW

1

OUT A 

–IN A

2

+IN A

T

JMAX

A

3

–

V

4

S8 PACKAGE

8-LEAD PLASTIC SO

= 150°C, θJA = 80°C/ W (NOTE 3)

8

V+
OUT B

7

–IN B

6

B

+IN B

5

NUMBER

LT1497CS8

S8 PART MARKING

1497

Operating Temperature Range (Note 2) ... – 40°C to 85°C

Specified Temperature Range ...................... 0°C to 70°C

Maximum Junction Temperature (See Below) ....... 150°C

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

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

TOP VIEW

1

V–

2

NC

3

OUT A

4

–IN A
+IN A

T

JMAX

V
NC
V

A

5

–

6



7

–

8

S PACKAGE

16-LEAD PLASTIC SO

= 150°C, θJA = 40°C/ W (NOTE 3)



16

V–

15

NC 

+

14

V



13

OUT B

12

–IN B

B

11

+IN B

10

NC

–

9

V

ORDER PART

NUMBER

LT1497CS

Consult factory for Industrial and Military grade parts.

ELECTRICAL CHARACTERISTICS

VCM = 0V, ±2.5V ≤ VS ≤ ±15V (LT1497CS), ±2.5V ≤ VS ≤ ±5V (LT1497CS8), pulse tested unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

I

I

e
+i
–i
R

C

OS

+

IN

–

IN

n

n

n

IN

IN

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

● ±15 mV

Input Offset Voltage Matching TA = 25°C ±1 ±3.5 mV

● ±5.0 mV

Input Offset Voltage Drift ● 10 µV/°C
Noninverting Input Current TA = 25°C ±1 ±3 µA

● ±10 µA

Noninverting Input Current Matching TA = 25°C ±0.3 ±1.0 µA

● ±1.5 µA

Inverting Input Current TA = 25°C ±7 ±20 µA

● ±40 µA

Inverting Input Current Matching TA = 25°C ±3 ±10 µA

● ±15 µA

Input Noise Voltage Density f = 1kHz, RF = 1k, RG = 10Ω, RS = 0Ω 3 nV/√Hz
Noninverting Input Noise Current Density f = 1kHz, RF = 1k, RG = 10Ω, RS = 10k 2 pA/√Hz
Inverting Input Noise Current Density f = 1kHz, RF = 1k, RG = 10Ω, RS = 10k 20 pA/√Hz
Input Resistance VIN = ±13V, VS = ±15V ● 1.5 10 MΩ

VIN = ±3V, VS = ±5V ● 1.5 8 MΩ
VIN = ±0.5V, VS = ±2.5V ● 1.5 8 MΩ

Input Capacitance 3pF

2

LT1497

ELECTRICAL CHARACTERISTICS

VCM = 0V, ±2.5V ≤ VS ≤ ±15V (LT1497CS), ±2.5V ≤ VS ≤ ±5V (LT1497CS8), pulse tested unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range VS = ±15V ● ±13 ±14 V

VS = ±5V ● ±3.0 ±4.0 V

= ±2.5V ● ±0.5 ±1.5 V

V

S

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

●53 dB

VS = ±5V, VCM = ±3V, TA = 25°C5460dB

●52 dB

VS = ±2.5V, VCM = ±0.5V, TA = 25°C5256 dB

●50 dB

Inverting Input Current VS = ±15V, VCM = ±13V ● 2.0 10 µA/V
Common Mode Rejection V

PSRR Power Supply Rejection Ratio VS = ±2V to ±15V, TA = 25°C6676dB

Noninverting Input Current VS = ±2V to ±15V ● 5 50 nA/V
Power Supply Rejection V

Inverting Input Current VS = ±2V to ±15V ● 0.1 2 µA/V
Power Supply Rejection V

A

R

V

I

I

VOL

OL

OUT

OUT

S

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

Transresistance, ∆V

OUT

/∆I

–

IN

Maximum Output Swing VS = ±15V, RL = 150Ω, TA = 25°C ±12.80 ±13.15 V

Maximum Output Current RL = 1Ω, VS = ±15V ● ±125 ±220 mA

Supply Current per Amplifier VS = ±2.5V to ±5V, TA = 25°C 6.0 7.0 mA

Channel Separation VS = ±15V, V

= ±5V, VCM = ±3V ● 2.5 10 µA/V

S

= ±2.5V, VCM = ±0.5V ● 3.0 10 µA/V

V

S

●63 dB

VS = ±2V to ±5V, TA = 25°C6676dB

●63 dB

= ±2V to ±5V ● 5 50 nA/V

S

= ±2V to ±5V ● 0.1 2 µA/V

S

= ±10V, RL = 150Ω ● 66 80 dB

= ±5V, V

V

S

= ±2.5V, V

V

S

VS = ±15V, V

= ±5V, V

V

S

VS = ±2.5V, V

OUT

= ±2.5V, RL = 50Ω ● 66 80 dB

OUT

= ±0.5V, RL = 50Ω ● 66 80 dB

OUT

= ±10V, RL = 150Ω ● 100 500 kΩ

OUT

= ±2.5V, RL = 50Ω ● 100 500 kΩ

OUT

= ±0.5V, RL = 50Ω ● 100 300 kΩ

OUT

● ±12.60 V

VS = ±15V, IL = ±100mA, TA = 25°C ±12.65 ±13.0 V

● ±12.55 V

VS = ±5V, RL = 50Ω, TA = 25°C ±3.20 ±3.45 V

● ±3.10 V

VS = ±5V, IL = ±100mA, TA = 25°C ±2.75 ±3.10 V

● ±2.65 V

VS = ±2.5V, RL = 50Ω, TA = 25°C ±1.25 ±1.45 V

● ±1.15 V

VS = ±2.5V, IL = ±50mA, TA = 25°C ±1.00 ±1.15 V

● ±0.90 V

= 1Ω, VS = ±5V ● ±125 ±220 mA

R

L

RL = 1Ω, VS = ±2.5V ±140 mA

● 8.0 mA

VS = ±15V, TA = 25°C 7.0 9.0 mA

● 10.5 mA

= ±10V, RL = 150Ω ● 100 120 dB

= ±5V, V

V

S

OUT

= ±2.5V, RL = 50Ω ● 100 115 dB

OUT

3

LT1497

ELECTRICAL CHARACTERISTICS

VCM = 0V, ±2.5V ≤ VS ≤ ±15V (LT1497CS), ±2.5V ≤ VS ≤ ±5V (LT1497CS8), pulse tested unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

SR Slew Rate VS = ±15V, TA = 25°C (Note 4) 500 900 V/µs

VS = ±5V, TA = 25°C (Note 4) 200 350 V/µs

BW Small-Signal Bandwidth VS = ±15V, RF = RG = 560Ω, RL = 100Ω 50 MHz

VS = ±5V, RF = RG = 560Ω, RL = 100Ω 35 MHz
VS = ±2.5V, RF = RG = 560Ω, RL = 100Ω 30 MHz

t

r

t

s

Small-Signal Rise Time VS = ±15V, RF = RG = 560Ω, RL = 100Ω 7.5 ns

Overshoot VS = ±15V, RF = RG = 560Ω, RL = 100Ω 15 %

Propagation Delay VS = ±15V, RF = RG = 560Ω, RL = 100Ω 6.8 ns

Settling Time VS = ±15V, 10V Step, 0.1%, AV = –1 55 ns

Differential Gain (Note 5) VS = ±15V, RF = RG = 510Ω, RL = 150Ω 0.02 %

Differential Phase (Note 5) VS = ±15V, RF = RG = 510Ω, RL = 150Ω 0.015 Deg

V

= ±5V, RF = RG = 560Ω, RL = 100Ω 9.5 ns

S

VS = ±2.5V, RF = RG = 560Ω, RL = 100Ω 11 ns

V

= ±5V, RF = RG = 560Ω, RL = 100Ω 12 %

S

VS = ±2.5V, RF = RG = 560Ω, RL = 100Ω 10 %

VS = ±5V, RF = RG = 560Ω, RL = 100Ω 8.4 ns
V

= ±2.5V, RF = RG = 560Ω, RL = 100Ω 9.7 ns

S

VS = ±5V, 5V Step, 0.1%, AV = –1 50 ns

VS = ±15V, RF = RG = 510Ω, RL = 50Ω 0.19 %
VS = ±5V, RF = RG = 510Ω, RL = 150Ω 0.08 %
V

= ±5V, RF = RG = 510Ω, RL = 50Ω 0.41 %

S

VS = ±15V, RF = RG = 510Ω, RL = 50Ω 0.235 Deg
VS = ±5V, RF = RG = 510Ω, RL = 150Ω 0.045 Deg
V

= ±5V, RF = RG = 510Ω, RL = 50Ω 0.310 Deg

S

● 400 V/µs

● 150 V/µs

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

Note 1: Applies to short circuits to ground only. A short circuit between the
output and either supply may damage the part when operated on supplies
greater than ±10V

Note 2: The LT1497 is designed, characterized and expected to operate
over the temperature range of –40°C to 85°C, but is not tested at –40°C
and 85°C. Guaranteed industrial grade parts are available, consult factory.

Note 3: Thermal resistance varies depending upon the amount of PC board
metal attached to the device. θ
covered with 2oz copper on both sides.

is specified for a 2500mm2 test board

JA

Note 4: Slew rate is measured between ±5V on a ±10V output signal while
operating on ±15V supplies with R
On ±5V supplies slew rate is measured between ±1V on a ±3V output
signal. The slew rate is much higher when the input is overdriven and
when the amplifier is operated inverting. See the Applications Information
section.

Note 5: NTSC composite video with an amplifier output level of 2V peak.

= 453Ω, RG = 49.9Ω and RL = 150Ω.

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