LINEAR TECHNOLOGY LT6300 Technical data

FEATURES

■

Exceeds All Requirements For Full Rate,
Downstream ADSL Line Drivers

■

Power Enhanced 16-Lead SSOP Package

■

Power Saving Adjustable Supply Current

■

±500mA Minimum I

■

±10.9V Output Swing, VS = ±12V, RL = 100Ω

■

±10.7V Output Swing, VS = ±12V, IL = 250mA

■

Low Distortion: –82dBc at 1MHz, 2V

■

200MHz Gain Bandwidth

■

600V/µs Slew Rate

■

Specified at ±12V and ±5V

OUT

P-P

LT6300

500mA, 200MHz xDSL

Line Driver in 16-Lead SSOP Package

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DESCRIPTIO

The LT®6300 is a 500mA minimum output current, dual op
amp with outstanding distortion performance. The ampli­fiers are gain-of-ten stable, but can be easily compensated
for lower gains. The extended output swing allows for
lower supply rails to reduce system power. Supply current
is set with an external resistor to optimize power dissipa­tion. The LT6300 features balanced, high impedance in-

Into 50Ω

puts with low input bias current and input offset voltage.
Active termination is easily implemented for further sys­tem power reduction. Short-circuit protection and thermal
shutdown insure the device’s ruggedness.

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APPLICATIO S

■

High Efficiency ADSL, HDSL2, SHDSL Line Drivers

■

Buffers

■

Test Equipment Amplifiers

■

Cable Drivers

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TYPICAL APPLICATIO

High Efficiency ±12V Supply ADSL Line Driver

12V

1000pF

+IN

110Ω

110Ω

+

LT6300

–

1/2

1k

1k

24.9k

SHDN

The outputs drive a 100Ω load to ±10.9V with ±12V
supplies, and ±10.7V with a 250mA load. The LT6300 is a
functional replacement for the LT1739 and LT1794 in
xDSL line driver applications and requires no circuit
changes.

The LT6300 is available in the very small, thermally
enhanced, 16-lead SSOP package (same PCB area as the
SO-8 package) for maximum port density in line driver
applications.

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

12.7Ω

1:2*

•

•

100Ω

–IN

–

LT6300

+

1/2

–12V

SHDNREF

12.7Ω

*COILCRAFT X8390-A OR EQUIVALENT

= 10mA PER AMPLIFIER

I

SUPPLY

WITH R

SHDN

= 24.9k

6300 TA01

1

LT6300

WW

W

ABSOLUTE MAXIMUM RATINGS

U

U

W

PACKAGE/ORDER INFORMATION

(Note 1)

Supply Voltage (V+ to V–) ................................. ±13.5V

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

Output Short-Circuit Duration (Note 2)........... Indefinite

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

Specified Temperature Range (Note 3).. – 40°C to 85°C

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

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

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

V
–IN
+IN

SHDN

SHDNREF

+IN
–IN

V

T

= 150°C, θJA = 70°C/W to 95°C/W (Note 4)

JMAX

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

TOP VIEW

–

1
2
3
4
5
6
7

–

8

GN PACKAGE

16-LEAD PLASTIC SSOP

ORDER PART

–

16

V

15

OUT

14

NC

+

13

V

+

12

V

11

NC

10

OUT

–

9

V

NUMBER

LT6300CGN
LT6300IGN

GN PART

MARKING

6300
6300I

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25°C.
VCM = 0V, pulse tested, ±5V ≤ VS ≤ ±12V, V

SHDNREF

= 0V, R

= 24.9k between V+ and SHDN unless otherwise noted. (Note 3)

BIAS

U

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

OS

I

B

e

n

i

n

R

IN

C

IN

CMRR Common Mode Rejection Ratio V

PSRR Power Supply Rejection Ratio VS = ±4V to ±12V 74 88 dB

Input Offset Voltage 15.0 mV

● 7.5 mV

Input Offset Voltage Matching 0.3 5.0 mV

● 7.5 mV

Input Offset Voltage Drift ● 10 µV/°C
Input Offset Current 100 500 nA

● 800 nA

Input Bias Current ±0.1 ±4 µA

● ±6 µA

Input Bias Current Matching 100 500 nA

● 800 nA

Input Noise Voltage Density f = 10kHz 8 nV/√Hz
Input Noise Current Density f = 10kHz 0.8 pA/√Hz
Input Resistance V

Input Capacitance 3pF
Input Voltage Range (Positive) (Note 5) ● V+ – 2 V+ – 1 V

Input Voltage Range (Negative) (Note 5)

= (V+ – 2V) to (V–+ 2V) ● 550 MΩ

CM

Differential 6.5 MΩ

● V

= (V+ – 2V) to (V– + 2V) 74 83 dB

CM

● 66 dB

● 66 dB

–

+ 1 V– + 2 V

2

LT6300

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25°C.
VCM = 0V, pulse tested, ±5V ≤ VS ≤ ±12V, V

SHDNREF

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

A

V

I
I

VOL

OUT

OUT
S

Large-Signal Voltage Gain VS = ±12V, V

Output Swing VS = ±12V, RL = 100Ω 10.7 10.9 ±V

Maximum Output Current VS = ±12V, RL = 1Ω 500 1200 mA
Supply Current per Amplifier VS = ±12V, R

Supply Current in Shutdown V
Output Leakage in Shutdown V
Channel Separation VS = ±12V, V

SR Slew Rate VS = ±12V, AV = –10, (Note 7) 300 600 V/µs

HD2 Differential 2nd Harmonic Distortion VS = ±12V, AV = 10, 2V
HD3 Differential 3rd Harmonic Distortion VS = ±12V, AV = 10, 2V
GBW Gain Bandwidth f = 1MHz 200 MHz

= 0V, R

VS = ±5V, V

= 24.9k between V+ and SHDN unless otherwise noted. (Note 3)

BIAS

= ±10V, RL = 40Ω 63 76 dB

OUT

= ±3V, RL = 25Ω 60 70 dB

OUT

● 57 dB

● 54 dB

● 10.5 ±V

VS = ±12V, IL = 250mA 10.4 10.7 ±V

● 10.2 ±V

VS = ±5V, RL = 25Ω 3.5 3.8 ±V

● 3.3 ±V

VS = ±5V, IL = 250mA 3.4 3.7 ±V

● 3.2 ±V

= 24.9k (Note 6) 8.0 10 13.5 mA

BIAS

= ±12V, R

V

S

= ±12V, R

V

S

VS = ±12V, R
VS = ±5V, R

= 0.4V 0.1 1 mA

SHDN

= 0.4V 0.3 1 mA

SHDN

= 32.4k (Note 6) 8 mA

BIAS

= 43.2k (Note 6) 6 mA

BIAS

= 66.5k (Note 6) 4 mA

BIAS

= 24.9k (Note 6) 2.2 3.4 5.0 mA

BIAS

= ±10V, RL = 40Ω 80 110 dB

OUT

● 6.7 15.0 mA

● 1.8 5.8 mA

● 77 dB

VS = ±5V, AV = –10, (Note 7) 100 200 V/µs

, RL = 50Ω, 1MHz –85 dBc

P-P

, RL = 50Ω, 1MHz –82 dBc

P-P

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

Note 2: Applies to short circuits to ground only. A short circuit between
the output and either supply may permanently damage the part when
operated on supplies greater than ±10V.

Note 3: The LT6300C is guaranteed to meet specified performance from
0°C to 70°C and is designed, characterized and expected to meet these
extended temperature limits, but is not tested at –40°C and 85°C. The
LT6300I is guaranteed to meet the extended temperature limits.

Note 4: Thermal resistance varies depending upon the amount of PC board
metal attached to Pins 1, 8, 9, 16 of the device. If the maximum
dissipation of the package is exceeded, the device will go into thermal
shutdown and be protected.

Note 5: Guaranteed by the CMRR tests.
Note 6: R

is connected between V+ and the SHDN pin, with the

BIAS

SHDNREF pin grounded.
Note 7: Slew rate is measured at ±5V on a ±10V output signal while

operating on ±12V supplies and ±1V on a ±3V output signal while
operating on ±5V supplies.

3

LT6300

TEMPERATURE (°C)

–50

OUTPUT SATURATION VOLTAGE (V)

–0.5

10

6300 G06

1.0

–30 –10 30

0.5

V

–

V

+

–1.0

–1.5

1.5

50 70 90

VS = ±12V

RL = 100Ω

RL = 100Ω

I

LOAD

= 250mA

I

LOAD

= 250mA

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Supply Current
vs Ambient Temperature

15

VS = ±12V

14

= 24.9k TO SHDN

R

BIAS

= 0V

V

SHDNREF

13
12
11
10

9

PER AMPLIFIER (mA)

8

SUPPLY

I

7
6
5

–30 –10 10 30 50 70 90

–50

TEMPERATURE (°C)

Input Noise Spectral Density

100

TA = 25°C
V

= ±12V

S

PER AMPLIFIER = 10mA

I

S

10

1

INPUT VOLTAGE NOISE (V/√Hz)

0.1
10

1 100 1k 10k

FREQUENCY (Hz)

Input Common Mode Range
vs Supply Voltage

+

V

TA = 25°C

> 1mV

∆V

–0.5

OS

–1.0
–1.5
–2.0

2.0

1.5

COMMON MODE RANGE (V)

1.0

0.5

–

6300 G01

V

2

4

SUPPLY VOLTAGE (±V)

6

810

12

14

6300 G02

Output Short-Circuit Current
vs Ambient Temperature

INPUT CURRENT NOISE (pA/√Hz)

800
780
760
740
720
700

(mA)

SC

I

680
660
640

600

620

–50

VS = ±12V
I

–30 10

–10

TEMPERATURE (°C)

PER AMPLIFIER = 10mA

S

SINKING

SOURCING

30

70

50

90

6300 G05

100

e

n

i

n

6300 G04

100k

10

1

0.1

Input Bias Current
vs Ambient Temperature

200

VS = ±12V

180

PER AMPLIFIER = 10mA

I

S

160
140
120

(nA)

100

BIAS

±I

80
60
40
20

0

–50

–30

10 30

–10

TEMPERATURE (°C)

Output Saturation Voltage
vs Ambient Temperature

50

70 90

6300 G03

Open-Loop Gain and Phase
vs Frequency

120
100

80
60
40
20

GAIN (dB)

0
–20
–40
–60
–80

100k 10M 100M

4

TA = 25°C

= ±12V

V

S

= –10

A

V

= 100Ω

R

L

PER AMPLIFIER = 10mA

I

S

1M

GAIN

FREQUENCY (Hz)

PHASE

6300 G07

120
80
40
0
–40
–80
–120
–160
–200
–240
–280

45

40

35

30

PHASE (DEG)

25

20

15

–3dB BANDWIDTH (MHz)

10

5

0

–3dB Bandwidth
vs Supply Current Slew Rate vs Supply Current

TA = 25°C
V

= ±12V

S

= 10

A

V

R

= 100Ω

L

4

2

SUPPLY CURRENT PER AMPLIFIER (mA)

6 8 10 12 14

6300 G08

1000

TA = 25°C

900

= ±12V

V

S

= –10

A

V

800

R

= 1k

L

700
600
500
400

SLEW RATE (V/µs)

300
200
100

0

345

2

SUPPLY CURRENT PER AMPLIFIER (mA)

67

8910

RISING

FALLING

11 12

13 14

6300 G09

15

UW

TYPICAL PERFOR A CE CHARACTERISTICS

CMRR vs Frequency PSRR vs Frequency

100

90
80
70
60

50
40
30
20
10

COMMON MODE REJECTION RATIO (dB)

0

0.1

TA = 25°C

= ±12V

V

S

= 10mA PER AMPLIFIER

I

S

1 10 100

FREQUENCY (MHz)

6300 G10

100

90
80
70
60
50
40
30
20
10

POWER SUPPLY REJECTION (dB)

0

–10

0.01 1 10 100

VS = ±12V

= 10

A

V

= 10mA PER AMPLIFIER

I

S

(–) SUPPLY

(+) SUPPLY

0.1
FREQUENCY (MHz)

6300 G11

Frequency Response
vs Supply Current

30

VS = ±12V

25

= 10

A

V

20
15
10

5

GAIN (dB)

0

–5
–10
–15

–20

1k 10k

2mA PER AMPLIFIER

10mA PER AMPLIFIER
15mA PER AMPLIFIER

LT6300

100k 1M 10M 100M

FREQUENCY (Hz)

6300 G12

Output Impedance vs Frequency I

1000

TA = 25°C

±12V

V

S

100

IS PER

IS PER

IS PER
AMPLIFIER = 15mA

1 10 100

FREQUENCY (MHz)

6300 G13

10

AMPLIFIER = 10mA

1

OUTPUT IMPEDANCE (Ω)

0.1

0.01

0.01 0.1

AMPLIFIER = 2mA

Differential Harmonic Distortion
vs Output Amplitude

–40

f = 1MHz
T

= 25°C

A

–50

V

= ±12V

S

= 10

A

V

R

= 50Ω

L

–60

I

PER AMPLIFIER = 10mA

S

–70

–80

DISTORTION (dBc)

–90

–100

02

6

4 8 10 12 14 16 18

V

OUT(P-P)

HD3

HD2

2.5

2.0

1.5

(mA)

SHDN

I

1.0

0.5

0

0

6300 G16

SHDN

TA = 25°C

= ±12V

V

S

V

SHDNREF

0.5

vs V

= 0V

1.0

SHDN

1.5

2.0
V

2.5

SHDN

(V)

3.0

3.5

4.0

4.5

6300 G14

DISTORTION (dBc)

Supply Current vs V

35

TA = 25°C

= ±12V

V

S

5.0

30

25

20

15

10

5

SUPPLY CURRENT PER AMPLIFIER (mA)

0

0

V

SHDNREF

0.5

1.0

= 0V

1.5

2.0
V

SHDN

Differential Harmonic Distortion
vs Frequency

–40

VO = 10V

–45
–50
–55
–60
–65
–70
–75
–80
–85
–90

P-P

TA = 25°C

= ±12V

V

S

A

= 10

V

R

= 50Ω

L

PER AMPLIFIER = 10mA

I

S

200100

400300

500

FREQUENCY (kHz)

HD3

600 700 900

2.5

800

3.0

(V)

HD2

SHDN

6300 G17

3.5

1000

4.0

4.5

6300 G15

5.0

5