LT1259/LT1260
Low Cost Dual and Triple
130MHz Current Feedback
Amplifiers with Shutdown
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
90MHz Bandwidth on
±5V
0.1dB Gain Flatness > 30MHz
Completely Off in Shutdown, 0µA Supply Current
High Slew Rate: 1600V/µs
Wide Supply Range:
±2V(4V)
to
±15V(30V)
60mA Output Current
Low Supply Current: 5mA/Amplifier
Differential Gain: 0.016%
Differential Phase: 0.075°
Fast Turn-On Time: 100ns
Fast Turn-Off Time: 40ns
14-Pin and 16-Pin Narrow SO Packages
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
RGB Cable Drivers
Spread Spectrum Amplifiers
MUX Amplifiers
Composite Video Cable Drivers
Portable Equipment
TYPICAL APPLICATIO
2-Input Video MUX Cable Driver
A
V
IN A
R
G
1.6k
CHANNEL
SELECT
EN A
75Ω
B
Square Wave Response
+
–
1/2 LT1259
R
F
1.6k
75Ω
CABLE
V
OUT
V
IN B
R
G
1.6k
+
–
EN B
75Ω
LT1259/60 • TA01
75Ω
1/2 LT1259
R
F
1.6k
CABLE OUTPUT
R
L
= 150Ω
f = 30MHz
U
LT1259/50 • TA02
U
U
1
LT1259/LT1260
ABSOLUTE
AXI U
RATI GS
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
Supply Voltage .....................................................
±18V
Input Current .....................................................
±15mA
Output Short-Circuit Duration (Note 1) ......... Continuous
Specified Temperature Range (Note 2) ....... 0°C to 70°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
–IN A
+IN A
GND
GND
GND
+IN B
–IN B
1
2
3
4
5
6
7
B
A
14 EN A
13 OUT A
12 V
+
11 GND
10 V
–
9
8
OUT B
EN B
ORDER PART
NUMBER
LT1259CN
LT1259CS
LT1259IN
LT1259IS
N PACKAGE
S PACKAGE
14-LEAD PLASTIC DIP 14-LEAD PLASTIC SOIC
T
JMAX
= 150°C,
θ
JA
= 70°C/W (N)
T
JMAX
= 150°C,
θ
JA
= 110°C/W (S)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
0°C
≤
T
A
≤
70°C, each amplifier V
CM
= 0V,
±5V ≤
V
S
≤ ±15V,
EN pins = 0V, pulse tested, unless otherwise noted.
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
Input Offset Voltage Drift
Noninverting Input Current
Inverting Input Current
Input Noise Voltage Density
Noninverting Input Noise Current Density
Inverting Input Noise Current Density
Input Resistance
Input Capacitance
Output Capacitance
Input Voltage Range
CONDITIONS
T
A
= 25°C
q
q
I
IN
+
T
A
= 25°C
q
I
IN–
e
n
+ i
n
– i
n
R
IN
C
IN
C
OUT
V
IN
T
A
= 25°C
q
f = 1kHz, R
F
= 1k, R
G
= 10Ω, R
S
= 0Ω
f = 1kHz
f = 1kHz
V
IN
=
±13V,
V
S
=
±15V
V
IN
=
±3V,
V
S
=
±5V
Enabled
Disabled
Disabled
V
S
=
±15V,
T
A
= 25°C
V
S
=
±5V,
T
A
= 25°C
2
U
U
W
W W
U
W
TOP VIEW
–IN R
+IN R
GND
–IN G
+IN G
GND
+IN B
–IN B
1
2
3
4
5
6
7
8
B
G
R
16 EN R
15 OUT R
14 V
+
13 EN G
12 OUT G
11 V
–
10 OUT B
9
EN B
ORDER PART
NUMBER
LT1260CN
LT1260CS
LT1260IN
LT1260IS
N PACKAGE
S PACKAGE
16-LEAD PLASTIC DIP 16-LEAD PLASTIC SOIC
T
JMAX
= 150°C,
θ
JA
= 70°C/W (N)
T
JMAX
= 150°C,
θ
JA
= 100°C/W (S)
MIN
TYP
2
30
0.5
20
3.6
1.3
45
17
25
2
4
4.4
±13.5
±3.5
MAX
12
16
3
6
90
120
q
q
2
2
q
q
±13
±12
±3
±2
UNITS
mV
mV
µV/°C
µA
µA
µA
µA
nV/√Hz
pA/√Hz
pA/√Hz
MΩ
MΩ
pF
pF
pF
V
V
V
V
LT1259/LT1260
ELECTRICAL CHARACTERISTICS
0°C
≤
T
A
≤
70°C, each amplifier V
CM
= 0V,
±5V ≤
V
S
≤ ±15V,
EN pins = 0V, pulse tested, unless otherwise noted.
SYMBOL
V
OUT
PARAMETER
Maximum Output Voltage Swing
CONDITIONS
V
S
=
±15V,
R
L
= 1k
V
S
=
±5V,
R
L
= 150Ω, T
A
= 25°C
V
S
=
±15V,
V
CM
=
±13V,
T
A
= 25°C
V
S
=
±15V,
V
CM
=
±12V
V
S
=
±5V,
V
CM
=
±3V,
T
A
= 25°C
V
S
=
±5V,
V
CM
=
±2V
V
S
=
±15V,
V
CM
=
±13V,
T
A
= 25°C
V
S
=
±15V,
V
CM
=
±12V
V
S
=
±5V,
V
CM
=
±3V,
T
A
= 25°C
V
S
=
±5V,
V
CM
=
±2V
V
S
=
±2V
to
±15V,
EN Pins at V
–
, T
A
= 25°C
V
S
=
±3V
to
±15V,
EN Pins at V
–
V
S
=
±3V
to
±15V,
EN Pins at V
–
, T
A
= 25°C
V
S
=
±3V
to
±15V,
EN Pins at V
–
V
S
=
±2V
to
±15V,
EN Pins at V
–
, T
A
= 25°C
V
S
=
±3V
to
±15V,
EN Pins at V
–
V
S
=
±15V,
V
OUT
=
±10V,
R
L
= 1k
V
S
=
±5V,
V
OUT
=
±2V,
R
L
= 150Ω
V
S
=
±15V,
V
OUT
=
±10V,
R
L
= 1k
V
S
=
±5V,
V
OUT
=
±2V,
R
L
= 150Ω
R
L
= 0Ω, T
A
= 25°C
V
S
=
±15V,
V
OUT
= 0V, T
A
= 25°C
q
q
CMRR
Common-Mode Rejection Ratio
q
q
q
MIN
±12.0
±3.0
±2.5
55
55
52
52
TYP
±14.0
±3.7
69
63
3.5
4.5
MAX
Inverting Input Current
Common-Mode Rejection
q
q
q
10
10
15
15
PSRR
Power Supply Rejection Ratio
Noninverting Input Current
Power Supply Rejection
Inverting Input Current
Power Supply Rejection
Large-Signal Voltage Gain
Transresistance,
∆V
OUT
/∆I
IN–
Maximum Output Current
Supply Current per Amplifier
(Note 5)
Disable Supply Current per Amplifier
Enable Pin Current
60
60
80
15
0.1
65
75
5
5
q
q
q
q
q
A
V
R
OL
I
OUT
I
S
57
57
120
100
30
72
69
300
200
60
5.0
4.5
3
1
60
V
S
=
±5V,
V
OUT
= 0V, T
A
= 25°C
V
S
=
±15V,
EN Pin Voltage = 14.5V, R
L
= 150Ω
q
q
V
S
=
±15V,
Sink 1µA From EN Pin
V
S
=
±15V,
EN Pin Voltage = 0V, T
A
= 25°C
q
q
7.5
7.9
6.7
16.7
2.7
200
300
400
150
SR
t
ON
t
OFF
t
r
, t
f
t
S
Slew Rate (Note 6)
Turn-On Delay Time (Note 7)
Turn-Off Delay Time (Note 7)
Small-Signal Rise and Fall Time
Propagation Delay
Small-Signal Overshoot
Settling Time
Differential Gain (Note 8)
Differential Phase (Note 8)
T
A
= 25°C
A
V
= 10, T
A
= 25°C
A
V
= 10, T
A
= 25°C
V
S
=
±12V,
R
F
= R
G
= 1.5k, R
L
= 150Ω
V
S
=
±12V,
R
F
= R
G
= 1.5k, R
L
= 150Ω
V
S
=
±12V,
R
F
= R
G
= 1.5k, R
L
= 150Ω
0.1%, V
OUT
= 10V, R
F
= R
G
= 1.5k, R
L
= 1k
V
S
=
±12V,
R
F
= R
G
= 1.5k, R
L
= 150Ω
V
S
=
±12V,
R
F
= R
G
= 1.5k, R
L
= 150Ω
900
1600
100
40
4.2
4.7
5
75
0.016
0.075
UNITS
V
V
V
dB
dB
dB
dB
µA/V
µA/V
µA/V
µA/V
dB
dB
nA/V
nA/V
µA/V
µA/V
dB
dB
kΩ
kΩ
mA
mA
mA
mA
µA
µA
µA
µA
V/µs
ns
ns
ns
ns
%
ns
%
DEG
– 40°C
≤
T
A
≤
85°C, each amplifier V
CM
= 0V,
±5V ≤
V
S
≤ ±15V,
EN pins = 0V, pulse tested, unless otherwise noted.
SYMBOL
V
OS
I
IN+
I
IN–
R
IN
A
V
I
S
PARAMETER
Input Offset Voltage
Noninverting Input Current
Inverting Input Current
Input Resistance
Large-Signal Gain
Disable Supply Current per Amplifier
Enable Pin Current
CONDITIONS
q
q
q
MIN
TYP
MAX
18
7
130
V
IN
=
±3V,
V
S
=
±5V
V
S
=
±15V,
EN Pin Voltage = 14.5V, R
L
= 150Ω
V
S
=
±15V,
EN Pin Voltage = 0V
q
q
q
q
1
55
19
350
UNITS
mV
µA
µA
MΩ
dB
µA
µA
3
LT1259/LT1260
ELECTRICAL CHARACTERISTICS
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
= 110Ω and R
L
= 1k.
Note 7:
Turn-on delay time is measured while operating on
±5V
supplies with R
F
= 1k, R
G
= 110Ω and R
L
= 150Ω. 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°.
TYPICAL AC PERFOR A CE
V
S
(V)
±12
±5
±12
±5
A
V
2
2
10
10
R
L
(Ω)
150
150
150
150
R
F
(Ω)
1.5k
1.1k
1.1k
825
R
G
(Ω)
1.5k
1.1k
121
90.9
SMALL SIGNAL
– 3dB BW (MHz)
130
93
69
61
SMALL SIGNAL
0.1dB BW (MHz)
53
40
20
16
SMALL SIGNAL
PEAKING (dB)
0.1
0
0.13
0
TYPICAL PERFOR A CE CHARACTERISTICS
±12V
Frequency Response, A
V
= 2
12
11
10
9
PHASE
0
–20
–40
–60
GAIN (dB)
GAIN (dB)
8
7
6
5
4
3
2
1
10
FREQUENCY (MHz)
100
LT1259/60 • TPC01
GAIN
V
S
= ±12V
R
L
= 150Ω
R
F
= R
G
= 1.5k
4
U W
U W
±12V
Frequency Response, A
V
= 10
26
25
24
23
PHASE (DEG)
0
V
S
= ±12V
R
L
= 150Ω
R
F
= 1.1k
R
G
= 121Ω
–20
–40
–60
PHASE (DEG)
–80
–100
GAIN
–120
–140
–160
–180
–200
1
10
FREQUENCY (MHz)
100
LT1259/60 • TPC01
PHASE
–80
–100
–120
–140
–160
–180
–200
22
21
20
19
18
17
16
LT1259/LT1260
TYPICAL PERFOR A CE CHARACTERISTICS
±5V
Frequency Response, A
V
= 2
12
11
10
9
PHASE
0
–20
–40
–60
26
25
24
23
PHASE
GAIN (dB)
7
6
5
4
3
2
1
V
S
= ±5V
R
L
= 150Ω
R
F
= R
G
= 1.1k
10
FREQUENCY (MHz)
100
LT1259/60 • TPC03
–100
GAIN
–120
–140
–160
–180
–200
GAIN (dB)
8
Total Harmonic Distortion
vs Frequency
0.1
TOTAL HARMONIC DISTORTION (%)
V
S
= ±12V
R
L
= 400Ω
R
F
= R
G
= 1.5k
DISTORTION (dBc)
V
O
= 6V
RMS
0.01
V
O
= 1V
RMS
–40
OUTPUT VOLTAGE (V
P-P
)
0.001
10
100
1k
10k
FREQUENCY (Hz)
100k
Power Supply Rejection
vs Frequency
80
POWER SUPPLY REJECTION (dB)
OUTPUT IMPEDANCE (Ω)
60
NEGATIVE
50
POSITIVE
40
30
20
10
0
10k
100k
1M
10M
FREQUENCY (Hz)
100M
SPOT NOISE (nV/√Hz OR pA/√Hz)
70
V
S
= ±15V
R
L
= 1OOΩ
R
F
= R
G
= 1k
LTC1259/60 • TPC08
U W
LT1259/60 • TPC05
±5V
Frequency Response, A
V
= 10
0
–20
–40
–60
PHASE (DEG)
PHASE (DEG)
–80
22
21
20
19
18
17
16
1
V
S
= ±5V
R
L
= 150Ω
R
F
= 825Ω
R
G
= 90.9Ω
10
FREQUENCY (MHz)
100
LT1259/60 • TPC04
–80
–100
GAIN
–120
–140
–160
–180
–200
2nd and 3rd Harmonic Distortion
vs Frequency
–20
V
S
= ±12V
V
O
= 2V
P-P
A
V
= 10dB
R
L
= 100Ω
R
F
= 1.5k
25
Maximum Undistorted Output
vs Frequency
V
S
= ±15V
R
L
= 1k
R
F
= 2k
–30
20
15
A
V
= 1
A
V
= 2
A
V
= 10
–50
2ND
3RD
10
–60
5
–70
1
10
FREQUENCY (MHz)
100
LT12359/60 • TPC06
0
1
10
FREQUENCY (MHz)
100
LT12359/60 • TPC07
Spot Noise Voltage and Current
vs Frequency
100
–i
n
100
Output Impedance vs Frequency
V
S
= ±15V
10
R
F
= R
G
= 2k
10
e
n
+i
n
1
10
1
100
1k
10k
FREQUENCY (Hz)
100k
0.1
10k
100k
1M
10M
FREQUENCY (Hz)
100M
LT1259/60 • TPC09
LT1259/60 • TPC10
5
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