LT6300
500mA, 200MHz xDSL
Line Driver in 16-Lead SSOP Package
FEATURES
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DESCRIPTIO
Exceeds All Requirements For Full Rate,
Downstream ADSL Line Drivers
Power Enhanced 16-Lead SSOP Package
Power Saving Adjustable Supply Current
±500mA
Minimum I
OUT
±10.9V
Output Swing, V
S
=
±12V,
R
L
= 100Ω
±10.7V
Output Swing, V
S
=
±12V,
I
L
= 250mA
Low Distortion: – 82dBc at 1MHz, 2V
P-P
Into 50Ω
200MHz Gain Bandwidth
600V/µs Slew Rate
Specified at
±12V
and
±5V
The LT
®
6300 is a 500mA minimum output current, dual op
amp with outstanding distortion performance. The ampli-
fiers 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 dissipa-
tion. The LT6300 features balanced, high impedance in-
puts with low input bias current and input offset voltage.
Active termination is easily implemented for further sys-
tem power reduction. Short-circuit protection and thermal
shutdown insure the device’s ruggedness.
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.
APPLICATIO S
s
s
s
s
High Efficiency ADSL, HDSL2, SHDSL Line Drivers
Buffers
Test Equipment Amplifiers
Cable Drivers
TYPICAL APPLICATIO
High Efficiency
±12V
Supply ADSL Line Driver
12V
24.9k
+IN
+
1/2
LT6300
SHDN
12.7Ω
–
1k
110Ω
1000pF
1:2*
•
•
110Ω
1k
*COILCRAFT X8390-A OR EQUIVALENT
I
SUPPLY
= 10mA PER AMPLIFIER
WITH R
SHDN
= 24.9k
6300 TA01
–
1/2
LT6300
–IN
12.7Ω
SHDNREF
+
–12V
U
100Ω
U
U
1
LT6300
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
V
–
1
16
V
–
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
ORDER PART
NUMBER
LT6300CGN
LT6300IGN
GN PART
MARKING
6300
6300I
–IN 2
+IN 3
SHDN 4
SHDNREF 5
+IN 6
–IN 7
V
–
8
15 OUT
14 NC
13 V
+
12 V
+
11 NC
10 OUT
9
V
–
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 70°C/W to 95°C/W (Note 4)
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full specified temperature range, otherwise specifications are at T
A
= 25°C.
V
CM
= 0V, pulse tested,
±5V ≤
V
S
≤ ±12V,
V
SHDNREF
= 0V, R
BIAS
= 24.9k between V
+
and SHDN unless otherwise noted. (Note 3)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
q
CONDITIONS
MIN
TYP
1
0.3
MAX
5.0
7.5
5.0
7.5
500
800
±4
±6
500
800
UNITS
mV
mV
mV
mV
µV/°C
nA
nA
µA
µA
nA
nA
nV/√Hz
pA/√Hz
MΩ
MΩ
pF
V
V
dB
dB
dB
dB
Input Offset Voltage Matching
q
Input Offset Voltage Drift
I
OS
I
B
Input Offset Current
q
q
10
100
±0.1
Input Bias Current
q
Input Bias Current Matching
q
100
f = 10kHz
f = 10kHz
V
CM
= (V
+
– 2V) to (V
–
+ 2V)
Differential
(Note 5)
(Note 5)
V
CM
= (V
+
– 2V) to (V
–
+ 2V)
q
q
e
n
i
n
R
IN
C
IN
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range (Positive)
Input Voltage Range (Negative)
8
0.8
5
50
6.5
3
q
q
V
+
– 2
74
66
74
66
V
+
– 1
V
–
+ 1
83
88
V
–
+
2
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V
S
=
±4V
to
±12V
q
2
U
W
U
U
W W
W
LT6300
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full specified temperature range, otherwise specifications are at T
A
= 25°C.
V
CM
= 0V, pulse tested,
±5V ≤
V
S
≤ ±12V,
V
SHDNREF
= 0V, R
BIAS
= 24.9k between V
+
and SHDN unless otherwise noted. (Note 3)
SYMBOL
A
VOL
PARAMETER
Large-Signal Voltage Gain
CONDITIONS
V
S
=
±12V,
V
OUT
=
±10V,
R
L
= 40Ω
q
MIN
63
57
60
54
10.7
10.5
10.4
10.2
3.5
3.3
3.4
3.2
500
q
TYP
76
70
10.9
10.7
3.8
3.7
1200
10
8
6
4
MAX
UNITS
dB
dB
dB
dB
±V
±V
±V
±V
±V
±V
±V
±V
mA
V
S
=
±5V,
V
OUT
=
±3V,
R
L
= 25Ω
q
V
OUT
Output Swing
V
S
=
±12V,
R
L
= 100Ω
q
V
S
=
±12V,
I
L
= 250mA
q
V
S
=
±5V,
R
L
= 25Ω
q
V
S
=
±5V,
I
L
= 250mA
q
I
OUT
I
S
Maximum Output Current
Supply Current per Amplifier
V
S
=
±12V,
R
L
= 1Ω
V
S
=
±12V,
R
BIAS
= 24.9k (Note 6)
V
S
=
±12V,
R
BIAS
= 32.4k (Note 6)
V
S
=
±12V,
R
BIAS
= 43.2k (Note 6)
V
S
=
±12V,
R
BIAS
= 66.5k (Note 6)
V
S
=
±5V,
R
BIAS
= 24.9k (Note 6)
q
8.0
6.7
13.5
15.0
mA
mA
mA
mA
mA
mA
mA
mA
mA
dB
dB
V/µs
V/µs
dBc
dBc
MHz
2.2
1.8
3.4
0.1
0.3
5.0
5.8
1
1
Supply Current in Shutdown
Output Leakage in Shutdown
Channel Separation
SR
HD2
HD3
GBW
Slew Rate
Differential 2nd Harmonic Distortion
Differential 3rd Harmonic Distortion
Gain Bandwidth
V
SHDN
= 0.4V
V
SHDN
= 0.4V
V
S
=
±12V,
V
OUT
=
±10V,
R
L
= 40Ω
q
80
77
300
100
110
600
200
– 85
– 82
200
V
S
=
±12V,
A
V
= – 10, (Note 7)
V
S
=
±5V,
A
V
= –10, (Note 7)
V
S
=
±12V,
A
V
= 10, 2V
P-P
, R
L
= 50Ω, 1MHz
V
S
=
±12V,
A
V
= 10, 2V
P-P
, R
L
= 50Ω, 1MHz
f = 1MHz
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
BIAS
is connected between V
+
and the SHDN pin, with the
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
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current
vs Ambient Temperature
15
14
V
S
=
±12V
R
BIAS
= 24.9k TO SHDN
V
SHDNREF
= 0V
I
SUPPLY
PER AMPLIFIER (mA)
COMMON MODE RANGE (V)
13
12
11
10
9
8
7
6
±I
BIAS
(nA)
5
–50
–30
–10 10
30
50
TEMPERATURE (°C)
Input Noise Spectral Density
100
T
A
= 25°C
V
S
=
±12V
I
S
PER AMPLIFIER = 10mA
e
n
100
OUTPUT SATURATION VOLTAGE (V)
INPUT VOLTAGE NOISE (V/√Hz)
10
I
SC
(mA)
1
i
n
0.1
1
10
100
1k
FREQUENCY (Hz)
10k
Open-Loop Gain and Phase
vs Frequency
120
100
80
60
GAIN (dB)
40
20
0
GAIN
T
A
= 25°C
V
S
=
±12V
A
V
= –10
R
L
= 100Ω
I
S
PER AMPLIFIER = 10mA
1M
10M
FREQUENCY (Hz)
100M
6300 G07
PHASE
–3dB BANDWIDTH (MHz)
30
25
20
15
10
5
0
2
4
6
8
10
12
14
SUPPLY CURRENT PER AMPLIFIER (mA)
6300 G08
–40
–80
–120
–160
–200
–240
–280
SLEW RATE (V/µs)
–20
–40
–60
–80
100k
4
U W
70
6300 G01
6300 G04
Input Common Mode Range
vs Supply Voltage
V
+
–0.5
–1.0
–1.5
–2.0
T
A
= 25°C
∆V
OS
> 1mV
200
Input Bias Current
vs Ambient Temperature
V
S
=
±12V
180 I
S
PER AMPLIFIER = 10mA
160
140
120
100
80
60
40
20
2.0
1.5
1.0
0.5
V
–
90
2
4
8
10
6
SUPPLY VOLTAGE (±V)
12
14
6300 G02
0
–50
–30
10
30
50
–10
TEMPERATURE (°C)
70
90
6300 G03
Output Short-Circuit Current
vs Ambient Temperature
800
780
V
S
=
±12V
I
S
PER AMPLIFIER = 10mA
V
+
–0.5
–1.0
–1.5
Output Saturation Voltage
vs Ambient Temperature
V
S
=
±12V
R
L
= 100Ω
I
LOAD
= 250mA
INPUT CURRENT NOISE (pA/√Hz)
PHASE (DEG)
760
740
720
700
680
660
640
620
SOURCING
SINKING
10
1
1.5
1.0
0.5
V
–
– 50 –30
–10
I
LOAD
= 250mA
R
L
= 100Ω
0.1
100k
600
–50
–30
30
–10 10
50
TEMPERATURE (°C)
70
90
50
30
10
TEMPERATURE (°C)
70
90
6300 G06
6300 G05
–3dB Bandwidth
vs Supply Current
120
80
40
0
Slew Rate vs Supply Current
1000
900
800
700
600
500
400
300
200
100
0
2 3 4 5 6 7 8 9 10 11 12 13 14 15
SUPPLY CURRENT PER AMPLIFIER (mA)
6300 G09
45
40
35
T
A
= 25°C
V
S
=
±12V
A
V
= 10
R
L
= 100Ω
T
A
= 25°C
V
S
=
±12V
A
V
= –10
R
L
= 1k
RISING
FALLING
LT6300
TYPICAL PERFOR A CE CHARACTERISTICS
CMRR vs Frequency
100
COMMON MODE REJECTION RATIO (dB)
90
80
70
60
50
40
30
20
10
0
0.1
POWER SUPPLY REJECTION (dB)
T
A
= 25°C
V
S
=
±12V
I
S
= 10mA PER AMPLIFIER
GAIN (dB)
1
10
FREQUENCY (MHz)
Output Impedance vs Frequency
1000
T
A
= 25°C
V
S
±12V
I
S
PER
AMPLIFIER = 2mA
10
I
S
PER
AMPLIFIER = 10mA
I
S
PER
AMPLIFIER = 15mA
I
SHDN
(mA)
2.5
SUPPLY CURRENT PER AMPLIFIER (mA)
100
OUTPUT IMPEDANCE (Ω)
1
0.1
0.01
0.01
0.1
1
10
FREQUENCY (MHz)
Differential Harmonic Distortion
vs Output Amplitude
f = 1MHz
T
A
= 25°C
–50 V
S
=
±12V
A
V
= 10
R
L
= 50Ω
–60 I PER AMPLIFIER = 10mA
S
HD3
–70
–80
HD2
–90
–100
0
2
4
6
8
10
12
14
16
18
V
OUT(P-P)
6300 G16
–40
DISTORTION (dBc)
DISTORTION (dBc)
U W
6300 G10
PSRR vs Frequency
100
90
80
70
60
50
40
30
20
10
0
100
Frequency Response
vs Supply Current
30
25
20
15
10
5
0
–5
–10
–15
–20
2mA PER AMPLIFIER
10mA PER AMPLIFIER
15mA PER AMPLIFIER
V
S
=
±12V
A
V
= 10
V
S
=
±12V
A
V
= 10
I
S
= 10mA PER AMPLIFIER
(–) SUPPLY
(+) SUPPLY
–10
0.01
0.1
1
10
FREQUENCY (MHz)
100
6300 G11
1k
10k
100k
1M
10M
FREQUENCY (Hz)
100M
6300 G12
I
SHDN
vs V
SHDN
35
T
A
= 25°C
V
S
=
±12V
V
SHDNREF
= 0V
30
25
20
15
10
5
0
Supply Current vs V
SHDN
T
A
= 25°C
V
S
=
±12V
V
SHDNREF
= 0V
2.0
1.5
1.0
0.5
100
6300 G13
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V
SHDN
(V)
6300 G14
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V
SHDN
(V)
6300 G15
Differential Harmonic Distortion
vs Frequency
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
HD2
HD3
V
O
= 10V
P-P
T
A
= 25°C
V
S
=
±12V
A
V
= 10
R
L
= 50Ω
I
S
PER AMPLIFIER = 10mA
–90
100 200 300 400 500 600 700 800 900 1000
FREQUENCY (kHz)
6300 G17
5
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