LT6301
Dual 500mA, Differential xDSL
Line Driver in 28-Lead TSSOP Package
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
Drives Two Lines from One Package
Exceeds All Requirements For Full Rate,
Downstream ADSL Line Drivers
Power Enhanced 28-Lead TSSOP Package
Power Saving Adjustable Supply Current
±500mA
Minimum I
OUT
±11.1V
Output Swing, V
S
=
±12V,
R
L
= 100Ω
±10.9V
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
®
6301 is a 500mA minimum output current, quad
op amp with outstanding distortion performance. The
amplifiers are gain-of-ten stable, but can be easily com-
pensated for lower gains. The extended output swing al-
lows for lower supply rails to reduce system power. Supply
current is set with an external resistor to optimize power
dissipation. The LT6301 features balanced, high imped-
ance inputs with low input bias current and input offset
voltage. Active termination is easily implemented for fur-
ther system power reduction. Short-circuit protection and
thermal shutdown ensure the device’s ruggedness.
The outputs drive a 100Ω load to
±11.1V
with
±12V
supplies, and
±10.9V
with a 250mA load. The LT6301 is a
functional replacement for the LT1739 and LT1794 in
xDSL line driver applications and requires no circuit
changes.
The LT6301 is available in the very small, thermally
enhanced, 28-lead TSSOP 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
s
High Density ADSL Central Office Line Drivers
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
+
1/4
LT6301
SHDN
12.7Ω
TWO COMPLETE ADSL LINE DRIVERS
PROVIDED WITH ONE LT6301 PACKAGE
–
1k
110Ω
1000pF
1:2*
•
•
110Ω
1k
*COILCRAFT X8390-A OR EQUIVALENT
I
SUPPLY
= 10mA PER AMPLIFIER
WITH R
SHDN
= 24.9k
6301 TA01
–
1/4
LT6301
–IN
12.7Ω
SHDNREF
+
–12V
U
100Ω
sn6301 6301f
U
U
1
LT6301
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
V
–
–IN A
+IN A
SHDN1
SHDNREF1
+IN B
–IN B
–IN C
+IN C
1
2
3
4
5
6
7
8
9
C
B
A
28 V
–
27 V
–
26 OUT A
25 V
+
24 V
+
23 OUT B
22 V
–
21 V
–
20 OUT C
19 V
+
18 V
+
17 OUT D
D
16 V
–
15 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
LT6301CFE
LT6301IFE
SHDN2 10
SHDNREF2 11
+IN D 12
–IN D 13
V
–
14
FE PACKAGE
28-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 25°C/W (NOTE 4)
UNDERSIDE METAL CONNECTED TO V
–
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
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
sn6301 6301f
Input Offset Voltage Matching
Input Offset Voltage Drift
I
OS
I
B
Input Offset Current
(Note 6)
q
q
q
0.3
10
100
±0.1
q
Input Bias Current
Input Bias Current Matching
(Note 6)
q
100
8
0.8
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)
f = 10kHz
f = 10kHz
V
CM
= (V
+
– 2V) to (V
–
+ 2V)
Differential
(Note 5)
(Note 5)
V
CM
= (V
+
– 2V) to (V
–
+ 2V)
q
5
50
6.5
3
V
+
– 1
V
–
+ 1
83
q
q
V
+
– 2
74
66
V
–
+
2
CMRR
Common Mode Rejection Ratio
2
U
W
U
U
W W
W
LT6301
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
PSRR
A
VOL
PARAMETER
Power Supply Rejection Ratio
Large-Signal Voltage Gain
CONDITIONS
V
S
=
±4V
to
±12V
q
MIN
74
66
63
57
60
54
10.9
10.7
10.6
10.4
3.7
3.5
3.6
3.4
500
q
TYP
88
76
70
11.1
10.9
4
3.9
1200
10
8
6
4
MAX
UNITS
dB
dB
dB
dB
dB
dB
±V
±V
±V
±V
±V
±V
±V
±V
mA
V
S
=
±12V,
V
OUT
=
±10V,
R
L
= 40Ω
q
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 7)
V
S
=
±12V,
R
BIAS
= 32.4k (Note 7)
V
S
=
±12V,
R
BIAS
= 43.2k (Note 7)
V
S
=
±12V,
R
BIAS
= 66.5k (Note 7)
V
S
=
±5V,
R
BIAS
= 24.9k (Note 7)
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 (Note 8)
q
80
77
300
100
110
600
200
– 85
– 82
200
V
S
=
±12V,
A
V
= – 10, (Note 9)
V
S
=
±5V,
A
V
= –10, (Note 9)
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 LT6301C 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
LT6301I 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, 14, 15, 28 and the exposed bottom side metal 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:
Matching is between amplifiers A and B or between amplifiers
C and D.
Note 7:
R
BIAS
is connected between V
+
and each SHDN pin, with each
SHDNREF pin grounded.
Note 8:
Channel separation is measured between amplifiers A and B and
between amplifiers C and D. Channel separation between any other
combination of amplifiers is guaranteed by design as two separate die are
used in the package.
Note 9:
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.
sn6301 6301f
3
LT6301
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 (nV/√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
10M
1M
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)
6301 G08
–40
–80
–120
–160
–200
–240
–280
SLEW RATE (V/µs)
–20
–40
–60
–80
100k
4
U W
70
6301 G01
6301 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
6301 G02
0
–50
–30
10
30
50
–10
TEMPERATURE (°C)
70
90
6301 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
6301 G06
6301 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)
6301 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
sn6301 6301f
LT6301
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)
6301 G16
–40
DISTORTION (dBc)
DISTORTION (dBc)
U W
6301 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
6301 G11
1k
10k
100k
1M
10M
FREQUENCY (Hz)
100M
6301 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
6301 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)
6301 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)
6301 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)
6301 G17
sn6301 6301f
5
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