1
LT1259/LT1260
Low Cost Dual and Triple
130MHz Current Feedback
Amplifiers with Shutdown
Square Wave Response
2-Input Video MUX Cable Driver
CABLE OUTPUT
R
L
= 150
f = 30MHz
LT1259/50 TA02
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.
The LT1259/LT1260 amplifiers are manufactured on
Linear Technology's proprietary complementary bipolar
process.
s
90MHz Bandwidth on
5V
s
0.1dB Gain Flatness > 30MHz
s
Completely Off in Shutdown, 0
A Supply Current
s
High Slew Rate: 1600V/
s
s
Wide Supply Range:
2V(4V) to
15V(30V)
s
60mA Output Current
s
Low Supply Current: 5mA/Amplifier
s
Differential Gain: 0.016%
s
Differential Phase: 0.075
s
Fast Turn-On Time: 100ns
s
Fast Turn-Off Time: 40ns
s
14-Pin and 16-Pin Narrow SO Packages
s
RGB Cable Drivers
s
Spread Spectrum Amplifiers
s
MUX Amplifiers
s
Composite Video Cable Drivers
s
Portable Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
+
1/2 LT1259
R
G
1.6k
R
F
1.6k
A
EN A
V
IN A
+
1/2 LT1259
R
G
1.6k
R
F
1.6k
EN B
V
IN B
B
CHANNEL
SELECT
75
75
75
V
OUT
75
CABLE
LT1259/60 TA01
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1259/LT1260
Supply Voltage .....................................................
18V
Input Current .....................................................
15mA
Output Short-Circuit Duration (Note 1) ......... Continuous
Specified Temperature Range (Note 2) ....... 0
C to 70
C
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
ORDER PART
NUMBER
ORDER PART
NUMBER
LT1259CN
LT1259CS
LT1259IN
LT1259IS
LT1260CN
LT1260CS
LT1260IN
LT1260IS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
T
A
= 25
C
2
12
mV
q
16
mV
Input Offset Voltage Drift
q
30
V/
C
I
IN
+
Noninverting Input Current
T
A
= 25
C
0.5
3
A
q
6
A
I
IN
Inverting Input Current
T
A
= 25
C
20
90
A
q
120
A
e
n
Input Noise Voltage Density
f = 1kHz, R
F
= 1k, R
G
= 10
, R
S
= 0
3.6
nV/
Hz
+ i
n
Noninverting Input Noise Current Density
f = 1kHz
1.3
pA/
Hz
i
n
Inverting Input Noise Current Density
f = 1kHz
45
pA/
Hz
R
IN
Input Resistance
V
IN
=
13V, V
S
=
15V
q
2
17
M
V
IN
=
3V, V
S
=
5V
q
2
25
M
C
IN
Input Capacitance
Enabled
2
pF
Disabled
4
pF
C
OUT
Output Capacitance
Disabled
4.4
pF
V
IN
Input Voltage Range
V
S
=
15V, T
A
= 25
C
13
13.5
V
q
12
V
V
S
=
5V, T
A
= 25
C
3
3.5
V
q
2
V
0
C
T
A
70
C, each amplifier V
CM
= 0V,
5V
V
S
15V, EN pins = 0V, pulse tested, unless otherwise noted.
Consult factory for Military grade parts.
T
JMAX
= 150
C,
JA
= 70
C/W (N)
T
JMAX
= 150
C,
JA
= 100
C/W (S)
1
2
3
4
5
6
7
8
TOP VIEW
N PACKAGE
16-LEAD PLASTIC DIP
16
15
14
13
12
11
10
9
IN R
+IN R
GND
IN G
+IN G
GND
+IN B
IN B
EN R
OUT R
V
+
EN G
OUT G
V
OUT B
EN B
R
S PACKAGE
16-LEAD PLASTIC SOIC
G
B
T
JMAX
= 150
C,
JA
= 70
C/W (N)
T
JMAX
= 150
C,
JA
= 110
C/W (S)
1
2
3
4
5
6
7
TOP VIEW
S PACKAGE
14-LEAD PLASTIC SOIC
N PACKAGE
14-LEAD PLASTIC DIP
14
13
12
11
10
9
8
IN A
+IN A
GND
GND
GND
+IN B
IN B
EN A
OUT A
V
+
GND
V
OUT B
EN B
A
B
ABSOLUTE AXI U RATI GS
W
W
W
U
PACKAGE/ORDER I FOR ATIO
U
U
W
ELECTRICAL CHARACTERISTICS
3
LT1259/LT1260
ELECTRICAL C
C
HARA TERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OUT
Maximum Output Voltage Swing
V
S
=
15V, R
L
= 1k
q
12.0
14.0
V
V
S
=
5V, R
L
= 150
, T
A
= 25
C
3.0
3.7
V
q
2.5
V
CMRR
Common-Mode Rejection Ratio
V
S
=
15V, V
CM
=
13V, T
A
= 25
C
55
69
dB
V
S
=
15V, V
CM
=
12V
q
55
dB
V
S
=
5V, V
CM
=
3V, T
A
= 25
C
52
63
dB
V
S
=
5V, V
CM
=
2V
q
52
dB
Inverting Input Current
V
S
=
15V, V
CM
=
13V, T
A
= 25
C
3.5
10
A/V
Common-Mode Rejection
V
S
=
15V, V
CM
=
12V
q
10
A/V
V
S
=
5V, V
CM
=
3V, T
A
= 25
C
4.5
15
A/V
V
S
=
5V, V
CM
=
2V
q
15
A/V
PSRR
Power Supply Rejection Ratio
V
S
=
2V to
15V, EN Pins at V
, T
A
= 25
C
60
80
dB
V
S
=
3V to
15V, EN Pins at V
q
60
dB
Noninverting Input Current
V
S
=
3V to
15V, EN Pins at V
, T
A
= 25
C
15
65
nA/V
Power Supply Rejection
V
S
=
3V to
15V, EN Pins at V
q
75
nA/V
Inverting Input Current
V
S
=
2V to
15V, EN Pins at V
, T
A
= 25
C
0.1
5
A/V
Power Supply Rejection
V
S
=
3V to
15V, EN Pins at V
q
5
A/V
A
V
Large-Signal Voltage Gain
V
S
=
15V, V
OUT
=
10V, R
L
= 1k
q
57
72
dB
V
S
=
5V, V
OUT
=
2V, R
L
= 150
q
57
69
dB
R
OL
Transresistance,
V
OUT
/
I
IN
V
S
=
15V, V
OUT
=
10V, R
L
= 1k
q
120
300
k
V
S
=
5V, V
OUT
=
2V, R
L
= 150
q
100
200
k
I
OUT
Maximum Output Current
R
L
= 0
, T
A
= 25
C
30
60
mA
I
S
Supply Current per Amplifier
V
S
=
15V, V
OUT
= 0V, T
A
= 25
C
5.0
7.5
mA
(Note 5)
q
7.9
mA
V
S
=
5V, V
OUT
= 0V, T
A
= 25
C
4.5
6.7
mA
Disable Supply Current per Amplifier
V
S
=
15V, EN Pin Voltage = 14.5V, R
L
= 150
q
3
16.7
A
V
S
=
15V, Sink 1
A From EN Pin
q
1
2.7
A
Enable Pin Current
V
S
=
15V, EN Pin Voltage = 0V, T
A
= 25
C
60
200
A
q
300
A
SR
Slew Rate (Note 6)
T
A
= 25
C
900
1600
V/
s
t
ON
Turn-On Delay Time (Note 7)
A
V
= 10, T
A
= 25
C
100
400
ns
t
OFF
Turn-Off Delay Time (Note 7)
A
V
= 10, T
A
= 25
C
40
150
ns
t
r
, t
f
Small-Signal Rise and Fall Time
V
S
=
12V, R
F
= R
G
= 1.5k, R
L
= 150
4.2
ns
Propagation Delay
V
S
=
12V, R
F
= R
G
= 1.5k, R
L
= 150
4.7
ns
Small-Signal Overshoot
V
S
=
12V, R
F
= R
G
= 1.5k, R
L
= 150
5
%
t
S
Settling Time
0.1%, V
OUT
= 10V, R
F
= R
G
= 1.5k, R
L
= 1k
75
ns
Differential Gain (Note 8)
V
S
=
12V, R
F
= R
G
= 1.5k, R
L
= 150
0.016
%
Differential Phase (Note 8)
V
S
=
12V, R
F
= R
G
= 1.5k, R
L
= 150
0.075
DEG
0
C
T
A
70
C, each amplifier V
CM
= 0V,
5V
V
S
15V, EN pins = 0V, pulse tested, unless otherwise noted.
40
C
T
A
85
C, each amplifier V
CM
= 0V,
5V
V
S
15V, EN pins = 0V, pulse tested, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
q
18
mV
I
IN
+
Noninverting Input Current
q
7
A
I
IN
Inverting Input Current
q
130
A
R
IN
Input Resistance
V
IN
=
3V, V
S
=
5V
q
1
M
A
V
Large-Signal Gain
q
55
dB
I
S
Disable Supply Current per Amplifier
V
S
=
15V, EN Pin Voltage = 14.5V, R
L
= 150
q
19
A
Enable Pin Current
V
S
=
15V, EN Pin Voltage = 0V
q
350
A
4
LT1259/LT1260
The
q
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
J
is calculated from the ambient temperature T
A
and the
power dissipation P
D
according to the following formulas:
LT1259CN/LT1259IN: T
J
= T
A
+ (P
D
70
C/W)
LT1259CS/LT1259IS: T
J
= T
A
+ (P
D
110
C/W)
LT1260CNLT1260IN/: T
J
= T
A
+ (P
D
70
C/W)
LT1260CS/LT1260IS: T
J
= T
A
+ (P
D
100
C/W)
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
F
= 1k, R
G
= 110
and R
L
= 1k.
Note 7: Turn-on delay time is measured while operating on
5V
supplies with R
F
= 1k, R
G
= 110
and R
L
= 150
. The t
ON
is measured
from control input to appearance of 0.5V at the output, for V
IN
= 0.1V.
Likewise, turn-off delay time is measured from control input to
appearance of 0.5V on the output for V
IN
= 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
.
SMALL SIGNAL
SMALL SIGNAL
SMALL SIGNAL
V
S
(V)
A
V
R
L
(
)
R
F
(
)
R
G
(
)
3dB BW (MHz)
0.1dB BW (MHz)
PEAKING (dB)
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
12V Frequency Response, A
V
= 2
FREQUENCY (MHz)
1
2
GAIN (dB)
4
6
8
10
10
100
LT1259/60 TPC01
3
5
7
9
11
12
200
160
120
80
40
180
140
100
60
0
PHASE (DEG)
PHASE
GAIN
V
S
= 12V
R
L
= 150
R
F
= R
G
= 1.5k
20
FREQUENCY (MHz)
1
16
GAIN (dB)
18
20
22
24
10
100
LT1259/60 TPC01
17
19
21
23
25
26
200
160
120
80
40
180
140
100
60
0
PHASE (DEG)
PHASE
GAIN
V
S
= 12V
R
L
= 150
R
F
= 1.1k
R
G
= 121
20
12V Frequency Response, A
V
= 10
ELECTRICAL CHARACTERISTICS
W
U
TYPICAL AC PERFOR A CE
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
5
LT1259/LT1260
5V Frequency Response, A
V
= 2
FREQUENCY (MHz)
1
2
GAIN (dB)
4
6
8
10
10
100
LT1259/60 TPC03
3
5
7
9
11
12
200
160
120
80
40
180
140
100
60
0
PHASE (DEG)
PHASE
GAIN
V
S
= 5V
R
L
= 150
R
F
= R
G
= 1.1k
20
FREQUENCY (MHz)
1
16
GAIN (dB)
18
20
22
24
10
100
LT1259/60 TPC04
17
19
21
23
25
26
200
160
120
80
40
180
140
100
60
0
PHASE (DEG)
PHASE
GAIN
V
S
= 5V
R
L
= 150
R
F
= 825
R
G
= 90.9
20
Total Harmonic Distortion
vs Frequency
FREQUENCY (Hz)
10
0.001
TOTAL HARMONIC DISTORTION (%)
0.01
0.1
1k
100k
LT1259/60 TPC05
100
10k
V
S
= 12V
R
L
= 400
R
F
= R
G
= 1.5k
V
O
= 6V
RMS
V
O
= 1V
RMS
2nd and 3rd Harmonic Distortion
vs Frequency
FREQUENCY (MHz)
1
70
DISTORTION (dBc)
60
50
40
30
10
100
LT12359/60 TPC06
20
2ND
3RD
V
S
= 12V
V
O
= 2V
P-P
A
V
= 10dB
R
L
= 100
R
F
= 1.5k
Maximum Undistorted Output
vs Frequency
FREQUENCY (MHz)
1
0
OUTPUT VOLTAGE (V
P-P
)
5
10
15
20
10
100
LT12359/60 TPC07
25
V
S
= 15V
R
L
= 1k
R
F
= 2k
A
V
= 1
A
V
= 2
A
V
= 10
Power Supply Rejection
vs Frequency
FREQUENCY (Hz)
20
POWER SUPPLY REJECTION (dB)
40
50
70
80
100k
1M
10M
LTC1259/60 TPC08
0
10k
60
30
10
100M
V
S
= 15V
R
L
= 1OO
R
F
= R
G
= 1k
POSITIVE
NEGATIVE
Spot Noise Voltage and Current
vs Frequency
Output Impedance vs Frequency
5V Frequency Response, A
V
= 10
FREQUENCY (Hz)
10k
OUTPUT IMPEDANCE (
)
1
100
1M
100M
LT1259/60 TPC10
0.1
10
100k
10M
V
S
= 15V
R
F
= R
G
= 2k
FREQUENCY (Hz)
10
1
SPOT NOISE (nV/
Hz OR pA/
Hz)
10
100
1k
100k
LT1259/60 TPC09
100
10k
i
n
e
n
+i
n
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
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