1
LT1398/LT1399/LT1399HV
Low Cost Dual and Triple
300MHz Current Feedback
Amplifiers with Shutdown
3-Input Video MUX Cable Driver
The LT
1399 and LT1399HV contain three independent
300MHz current feedback amplifiers, each with a shut-
down pin. The LT1399HV is a higher voltage version of the
LT1399. The LT1398 is a two amplifier version of the
LT1399.
The LT1398/LT1399 operate on all supplies from a single
4V to
6V. The LT1399HV operates on all supplies from 4V
to
7.5V.
Each amplifier draws 4.6mA when active. When disabled
each amplifier draws zero supply current and its output be-
comes high impedance. The amplifiers turn on in only 30ns
and turn off in 40ns, making them ideal in spread spectrum
and portable equipment applications.
The LT1398/LT1399/LT1399HV are manufactured on Lin-
ear Technology's proprietary complementary bipolar pro-
cess. The LT1399/LT1399HV are pin-for-pin upgrades to
the LT1260 optimized for use on
5V/
7.5V supplies.
s
300MHz Bandwidth on
5V (A
V
= 1, 2 and 1)
s
0.1dB Gain Flatness: 150MHz (A
V
= 1, 2 and 1)
s
Completely Off in Shutdown, 0
A Supply Current
s
High Slew Rate: 800V/
s
s
Wide Supply Range:
2V(4V) to
6V(12V) (LT1398/LT1399)
2V (4V) to
7.5V (15V) (LT1399HV)
s
80mA Output Current
s
Low Supply Current: 4.6mA/Amplifier
s
Fast Turn-On Time: 30ns
s
Fast Turn-Off Time: 40ns
s
16-Pin Narrow SO/Narrow SSOP Packages
s
RGB Cable Drivers
s
LCD 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.
Square Wave Response
OUTPUT
200mV/DIV
TIME (10ns/DIV)
1398/99 TA02
R
L
= 100
R
F
= R
G
= 324
f = 10MHz
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
+
1/3 LT1399
R
G
200
R
F
324
A
EN A
V
IN A
+
1/3 LT1399
R
G
200
R
F
324
EN B
V
IN B
B C
CHANNEL
SELECT
97.6
97.6
+
1/3 LT1399
R
G
200
R
F
324
EN C
V
IN C
97.6
75
V
OUT
75
CABLE
1399 TA01
2
LT1398/LT1399/LT1399HV
The
q
denotes specifications which apply over the specified operating temperature range, otherwise specifications are at T
A
= 25
C.
For each amplifier: V
CM
= 0V, V
S
=
5V, EN = 0V, pulse tested, unless otherwise noted. (Note 4)
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
(Note 1)
Total Supply Voltage (V
+
to V
)
LT1398/LT1399 ................................................ 12.6V
LT1399HV ....................................................... 15.5V
Input Current (Note 2) .......................................
10mA
Output Current .................................................
100mA
Differential Input Voltage (Note 2) ...........................
5V
Output Short-Circuit Duration (Note 3) ........ Continuous
Operating Temperature Range ............... 40
C to 85
C
Specified Temperature Range (Note 4) .. 40
C to 85
C
Storage Temperature Range ................ 65
C to 150
C
Junction Temperature (Note 5) ............................ 150
C
Lead Temperature (Soldering, 10 sec)................. 300
C
W
U
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
LT1399CGN
LT1399CS
LT1399HVCS
T
JMAX
= 150
C,
JA
= 120
C/W (GN)
T
JMAX
= 150
C,
JA
= 100
C/W (S)
*Ground pins are not internally connected. For best channel isolation, connect to ground. Consult factory for Industrial and Military grade parts.
ORDER PART
NUMBER
LT1398CS
T
JMAX
= 150
C,
JA
= 100
C/W
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
IN A
+IN A
*GND
*GND
*GND
*GND
+IN B
IN B
EN A
OUT A
V
+
GND*
GND*
V
OUT B
EN B
A
S PACKAGE
16-LEAD PLASTIC SO
B
ELECTRICAL C
C
HARA TERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
1.5
10
mV
q
12
mV
V
OS
/
T
Input Offset Voltage Drift
q
15
V/
C
I
IN
+
Noninverting Input Current
10
25
A
q
30
A
I
IN
Inverting Input Current
10
50
A
q
60
A
e
n
Input Noise Voltage Density
f = 1kHz, R
F
= 1k, R
G
= 10
, R
S
= 0
4.5
nV/
Hz
+ i
n
Noninverting Input Noise Current Density
f = 1kHz
6
pA/
Hz
i
n
Inverting Input Noise Current Density
f = 1kHz
25
pA/
Hz
R
IN
Input Resistance
V
IN
=
3.5V
q
0.3
1
M
C
IN
Input Capacitance
Amplifier Enabled
2.0
pF
Amplifier Disabled
2.5
pF
C
OUT
Output Capacitance
Amplifier Disabled
8.5
pF
V
INH
Input Voltage Range, High
V
S
=
5V
q
3.5
4.0
V
V
S
= 5V, 0V
4.0
V
1
2
3
4
5
6
7
8
TOP VIEW
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
G
S PACKAGE
16-LEAD PLASTIC SO
GN PACKAGE
16-LEAD PLASTIC SSOP
B
GN PART MARKING
1399
(LT1398/LT1399)
3
LT1398/LT1399/LT1399HV
ELECTRICAL C
C
HARA TERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
INL
Input Voltage Range, Low
V
S
=
5V
q
3.5
4.0
V
V
S
= 5V, 0V
1.0
V
V
OUTH
Maximum Output Voltage Swing, High
V
S
=
5V, R
L
= 100k
3.9
4.2
V
V
S
=
5V, R
L
= 100k
q
3.7
V
V
S
= 5V, 0V; R
L
= 100k
4.2
V
V
OUTL
Maximum Output Voltage Swing, Low
V
S
=
5V, R
L
= 100k
3.9
4.2
V
V
S
=
5V, R
L
= 100k
q
3.7
V
V
S
= 5V, 0V; R
L
= 100k
0.8
V
V
OUTH
Maximum Output Voltage Swing, High
V
S
=
5V, R
L
= 150
3.4
3.6
V
V
S
=
5V, R
L
= 150
q
3.2
V
V
S
= 5V, 0V; R
L
= 150
3.6
V
V
OUTL
Maximum Output Voltage Swing, Low
V
S
=
5V, R
L
= 150
3.4
3.6
V
V
S
=
5V, R
L
= 150
q
3.2
V
V
S
= 5V, 0V; R
L
= 150
0.6
V
CMRR
Common Mode Rejection Ratio
V
CM
=
3.5V
q
42
52
dB
I
CMRR
Inverting Input Current
V
CM
=
3.5V
10
16
A/V
Common Mode Rejection
V
CM
=
3.5V
q
22
A/V
PSRR
Power Supply Rejection Ratio
V
S
=
2V to
5V, EN = V
q
56
70
dB
+ I
PSRR
Noninverting Input Current
V
S
=
2V to
5V, EN = V
1
2
A/V
Power Supply Rejection
q
3
A/V
I
PSRR
Inverting Input Current
V
S
=
2V to
5V, EN = V
q
2
7
A/V
Power Supply Rejection
A
V
Large-Signal Voltage Gain
V
OUT
=
2V, R
L
= 150
50
65
dB
R
OL
Transimpedance,
V
OUT
/
I
IN
V
OUT
=
2V, R
L
= 150
40
100
k
I
OUT
Maximum Output Current
R
L
= 0
q
80
mA
I
S
Supply Current per Amplifier
V
OUT
= 0V
q
4.6
6.5
mA
Disable Supply Current per Amplifier
EN Pin Voltage = 4.5V, R
L
= 150
q
0.1
100
A
I
EN
Enable Pin Current
30
110
A
q
200
A
SR
Slew Rate (Note 6)
A
V
= 10, R
L
= 150
500
800
V/
s
t
ON
Turn-On Delay Time (Note 7)
R
F
= R
G
= 324
, R
L
= 100
30
75
ns
t
OFF
Turn-Off Delay Time (Note 7)
R
F
= R
G
= 324
, R
L
= 100
40
100
ns
t
r
, t
f
Small-Signal Rise and Fall Time
R
F
= R
G
= 324
, R
L
= 100
, V
OUT
= 1V
P-P
1.3
ns
t
PD
Propagation Delay
R
F
= R
G
= 324
, R
L
= 100
, V
OUT
= 1V
P-P
2.5
ns
os
Small-Signal Overshoot
R
F
= R
G
= 324
, R
L
= 100
, V
OUT
= 1V
P-P
10
%
t
S
Settling Time
0.1%, A
V
= 1, R
F
= R
G
= 309
, R
L
= 150
25
ns
dG
Differential Gain (Note 8)
R
F
= R
G
= 324
, R
L
= 150
0.13
%
dP
Differential Phase (Note 8)
R
F
= R
G
= 324
, R
L
= 150
0.10
DEG
The
q
denotes specifications which apply over the specified operating temperature range, otherwise specifications are at T
A
= 25
C.
For each amplifier: V
CM
= 0V, V
S
=
5V, EN = 0V, pulse tested, unless otherwise noted. (Note 4)
(LT1398/LT1399)
4
LT1398/LT1399/LT1399HV
The
q
denotes specifications which apply over the specified operating temperature range, otherwise specifications are at T
A
= 25
C.
For each amplifier: V
CM
= 0V, V
S
=
7.5V, EN = 0V, pulse tested, unless otherwise noted. (Note 4)
ELECTRICAL C
C
HARA TERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
1.5
10
mV
q
12
mV
V
OS
/
T
Input Offset Voltage Drift
q
15
V/
C
I
IN
+
Noninverting Input Current
10
25
A
q
30
A
I
IN
Inverting Input Current
10
50
A
q
60
A
e
n
Input Noise Voltage Density
f = 1kHz, R
F
= 1k, R
G
= 10
, R
S
= 0
, V
S
=
5V
4.5
nV/
Hz
+ i
n
Noninverting Input Noise Current Density
f = 1kHz, V
S
=
5V
6
pA/
Hz
i
n
Inverting Input Noise Current Density
f = 1kHz, V
S
=
5V
25
pA/
Hz
R
IN
Input Resistance
V
IN
=
6V
q
0.3
1
M
C
IN
Input Capacitance
Amplifier Enabled
2.0
pF
Amplifier Disabled
2.5
pF
C
OUT
Output Capacitance
Amplifier Disabled
8.5
pF
V
INH
Input Voltage Range, High
V
S
=
7.5V
q
6
6.5
V
V
S
= 7.5V, 0V
6.5
V
V
INL
Input Voltage Range, Low
V
S
=
7.5V
q
6
6.5
V
V
S
= 7.5V, 0V
1.0
V
V
OUTH
Maximum Output Voltage Swing, High
V
S
=
7.5V, R
L
= 100k
6.4
6.7
V
V
S
=
7.5V, R
L
= 100k
q
6.1
V
V
S
= 7.5V, 0V; R
L
= 100k
6.7
V
V
OUTL
Maximum Output Voltage Swing, Low
V
S
=
7.5V, R
L
= 100k
6.4
6.7
V
V
S
=
7.5V, R
L
= 100k
q
6.1
V
V
S
= 7.5V, 0V; R
L
= 100k
0.8
V
V
OUTH
Maximum Output Voltage Swing, High
V
S
=
7.5V, R
L
= 150
5.4
5.8
V
V
S
=
7.5V, R
L
= 150
q
5.1
V
V
S
= 7.5V, 0V; R
L
= 150
5.8
V
V
OUTL
Maximum Output Voltage Swing, Low
V
S
=
7.5V, R
L
= 150
5.4
5.8
V
V
S
=
7.5V, R
L
= 150
q
5.1
V
V
S
= 7.5V, 0V; R
L
= 150
0.6
V
CMRR
Common Mode Rejection Ratio
V
CM
=
6V
q
42
52
dB
I
CMRR
Inverting Input Current
V
CM
=
6V
10
16
A/V
Common Mode Rejection
V
CM
=
6V
q
22
A/V
PSRR
Power Supply Rejection Ratio
V
S
=
2V to
7.5V, EN = V
q
56
70
dB
+ I
PSRR
Noninverting Input Current
V
S
=
2V to
7.5V, EN = V
1
2
A/V
Power Supply Rejection
q
3
A/V
I
PSRR
Inverting Input Current
V
S
=
2V to
7.5V, EN = V
q
2
7
A/V
Power Supply Rejection
A
V
Large-Signal Voltage Gain
V
OUT
=
4.5V, R
L
= 150
50
65
dB
R
OL
Transimpedance,
V
OUT
/
I
IN
V
OUT
=
4.5V, R
L
= 150
40
100
k
I
OUT
Maximum Output Current
R
L
= 0
q
80
mA
I
S
Supply Current per Amplifier
V
OUT
= 0V
q
4.6
7
mA
Disable Supply Current per Amplifier
EN Pin Voltage = 7V, R
L
= 150
q
0.1
100
A
I
EN
Enable Pin Current
30
110
A
q
200
A
(LT1399HV)
5
LT1398/LT1399/LT1399HV
The
q
denotes specifications which apply over the specified operating temperature range, otherwise specifications are at T
A
= 25
C.
For each amplifier: V
CM
= 0V, V
S
=
7.5V, EN = 0V, pulse tested, unless otherwise noted. (Note 4)
ELECTRICAL C
C
HARA TERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SR
Slew Rate (Note 6)
A
V
= 10, R
L
= 150
, V
S
=
5V
500
800
V/
s
t
ON
Turn-On Delay Time (Note 7)
R
F
= R
G
= 324
, R
L
= 100
, V
S
=
5V
30
75
ns
t
OFF
Turn-Off Delay Time (Note 7)
R
F
= R
G
= 324
, R
L
= 100
, V
S
=
5V
40
100
ns
t
r
, t
f
Small-Signal Rise and Fall Time
R
F
= R
G
= 324
, R
L
= 100
, V
OUT
= 1V
P-P
,
1.3
ns
V
S
=
5V
t
PD
Propagation Delay
R
F
= R
G
= 324
, R
L
= 100
, V
OUT
= 1V
P-P
,
2.5
ns
V
S
=
5V
os
Small-Signal Overshoot
R
F
= R
G
= 324
, R
L
= 100
, V
OUT
= 1V
P-P
,
10
%
V
S
=
5V
t
S
Settling Time
0.1%, A
V
= 1V, R
F
= R
G
= 309
, R
L
= 150
,
25
ns
V
S
=
5V
dG
Differential Gain (Note 8)
R
F
= R
G
= 324
, R
L
= 150
, V
S
=
5V
0.13
%
dP
Differential Phase (Note 8)
R
F
= R
G
= 324
, R
L
= 150
, V
S
=
5V
0.10
DEG
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: This parameter is guaranteed to meet specified performance
through design and characterization. It has not been tested.
Note 3: A heat sink may be required depending on the power supply
voltage and how many amplifiers have their outputs short circuited.
Note 4: The LT1398/LT1399/LT1399HV are guaranteed to meet specified
performance from 0
C to 70
C and are designed, characterized and
expected to meet these extended temperature limits, but are not tested at
40
C and 85
C. Guaranteed I grade parts are available, consult factory.
Note 5: T
J
is calculated from the ambient temperature T
A
and the
power dissipation P
D
according to the following formula:
LT1398CS, LT1399CS, LT1399HVCS: T
J
= T
A
+ (P
D
100
C/W)
LT1399CGN: T
J
= T
A
+ (P
D
120
C/W)
Note 6: Slew rate is measured at
2V on a
3V output signal.
Note 7: Turn-on delay time (t
ON
) is measured from control input to
appearance of 1V at the output, for V
IN
= 1V. Likewise, turn-off delay
time (t
OFF
) is measured from control input to appearance of 0.5V on
the output for V
IN
= 0.5V. This specification is guaranteed by design
and characterization.
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
.
Ten identical amplifier stages were cascaded giving an effective
resolution of 0.01% and 0.01
.
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)
5
1
100
365
300
150
0.05
5
2
100
324
324
300
150
0
5
1
100
309
309
300
150
0
TYPICAL AC PERFOR A CE
W U
(LT1399HV)
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