LT1398/LT1399/LT1399HV
Low Cost Dual and Triple
300MHz Current Feedback
Amplifiers with Shutdown
FEATURES
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
300MHz Bandwidth on
±
5V (A
V
= 1, 2 and –1)
0.1dB Gain Flatness: 150MHz (A
V
= 1, 2 and –1)
Completely Off in Shutdown, 0µA Supply Current
High Slew Rate: 800V/µs
Wide Supply Range:
±2V(4V)
to
±6V(12V)
(LT1398/LT1399)
±2V
(4V) to
±7.5V
(15V) (LT1399HV)
80mA Output Current
Low Supply Current: 4.6mA/Amplifier
Fast Turn-On Time: 30ns
Fast Turn-Off Time: 40ns
16-Pin Narrow SO/Narrow SSOP Packages
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
RGB Cable Drivers
LCD Drivers
Spread Spectrum Amplifiers
MUX Amplifiers
Composite Video Cable Drivers
Portable Equipment
TYPICAL APPLICATIO
A
V
IN A
R
G
200Ω
CHANNEL
SELECT
EN A
B C
3-Input Video MUX Cable Driver
Square Wave Response
97.6Ω
+
–
1/3 LT1399
R
F
324Ω
75Ω
CABLE
V
OUT
V
IN B
R
G
200Ω
+
–
EN B
97.6Ω
75Ω
OUTPUT
200mV/DIV
1/3 LT1399
R
F
324Ω
V
IN C
R
G
200Ω
+
–
EN C
97.6Ω
1399 TA01
R
L
= 100Ω
R
F
= R
G
= 324Ω
f = 10MHz
1/3 LT1399
R
F
324Ω
U
TIME (10ns/DIV)
1398/99 TA02
U
U
sn13989 13989fas
1
LT1398/LT1399/LT1399HV
ABSOLUTE
AXI U
RATI GS
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
–IN A
+IN A
*GND
*GND
*GND
*GND
+IN B
–IN B
1
2
3
4
5
6
7
8
B
A
16 EN A
15 OUT A
14 V
+
13 GND*
12 GND*
11 V
–
10 OUT B
9
EN B
ORDER PART
NUMBER
LT1398CS
S PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 100°C/W
*Ground pins are not internally connected. For best channel isolation, connect to ground. Consult factory for parts specified with wider operating
temperature ranges.
ELECTRICAL CHARACTERISTICS
(LT1398/LT1399)
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)
SYMBOL
V
OS
∆V
OS
/∆T
I
IN+
I
IN–
e
n
+ i
n
– i
n
R
IN
C
IN
C
OUT
V
INH
PARAMETER
Input Offset Voltage
q
CONDITIONS
Input Offset Voltage Drift
Noninverting Input Current
Inverting Input Current
q
Input Noise Voltage Density
Noninverting Input Noise Current Density
Inverting Input Noise Current Density
Input Resistance
Input Capacitance
Output Capacitance
Input Voltage Range, High
f = 1kHz, R
F
= 1k, R
G
= 10Ω, R
S
= 0Ω
f = 1kHz
f = 1kHz
V
IN
=
±3.5V
Amplifier Enabled
Amplifier Disabled
Amplifier Disabled
V
S
=
±5V
V
S
= 5V, 0V
q
q
2
U
U
W
W W
U
W
(Note 1)
Output Short-Circuit Duration (Note 3) ........ Continuous
Operating Temperature Range (Note 9)... – 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
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
LT1399CGN
LT1399CS
LT1399HVCS
LT1399IGN
LT1399IS
GN PART MARKING
1399
1399I
GN PACKAGE
S PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 120°C/W (GN)
T
JMAX
= 150°C,
θ
JA
= 100°C/W (S)
MIN
TYP
1.5
MAX
10
12
25
30
50
60
UNITS
mV
mV
µV/°C
µA
µA
µA
µA
nV/√Hz
pA/√Hz
pA/√Hz
MΩ
pF
pF
pF
V
V
q
q
15
10
10
4.5
6
25
0.3
1
2.0
2.5
8.5
3.5
4.0
4.0
sn13989 13989fas
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)
SYMBOL
V
INL
V
OUTH
PARAMETER
Input Voltage Range, Low
Maximum Output Voltage Swing, High
CONDITIONS
V
S
=
±5V
V
S
= 5V, 0V
V
S
=
±5V,
R
L
= 100k
V
S
=
±5V,
R
L
= 100k
V
S
= 5V, 0V; R
L
= 100k
V
S
=
±5V,
R
L
= 100k
V
S
=
±5V,
R
L
= 100k
V
S
= 5V, 0V; R
L
= 100k
V
S
=
±5V,
R
L
= 150Ω
V
S
=
±5V,
R
L
= 150Ω
V
S
= 5V, 0V; R
L
= 150Ω
V
S
=
±5V,
R
L
= 150Ω
V
S
=
±5V,
R
L
= 150Ω
V
S
= 5V, 0V; R
L
= 150Ω
V
CM
=
±3.5V
V
CM
=
±3.5V
V
CM
=
±3.5V
V
S
=
±2V
to
±5V,
EN = V
–
V
S
=
±2V
to
±5V,
EN = V
–
q
q
ELECTRICAL CHARACTERISTICS
(LT1398/LT1399)
MIN
– 3.5
3.9
3.7
– 3.9
– 3.7
3.4
3.2
– 3.4
– 3.2
42
TYP
– 4.0
1.0
4.2
4.2
– 4.2
0.8
3.6
3.6
– 3.6
0.6
MAX
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
dB
q
V
OUTL
Maximum Output Voltage Swing, Low
q
V
OUTH
Maximum Output Voltage Swing, High
q
V
OUTL
Maximum Output Voltage Swing, Low
q
q
q
q
CMRR
– I
CMRR
PSRR
+ I
PSRR
– I
PSRR
A
V
R
OL
I
OUT
I
S
I
EN
SR
t
ON
t
OFF
t
r
, t
f
t
PD
os
t
S
dG
dP
Common Mode Rejection Ratio
Inverting Input Current
Common Mode Rejection
Power Supply Rejection Ratio
Noninverting Input Current
Power Supply Rejection
Inverting Input Current
Power Supply Rejection
Large-Signal Voltage Gain
Transimpedance,
∆V
OUT
/∆I
IN–
Maximum Output Current
Supply Current per Amplifier
Disable Supply Current per Amplifier
Enable Pin Current
52
10
16
22
2
3
7
µA/V
µA/V
dB
µA/V
µA/V
µA/V
dB
kΩ
mA
56
70
1
V
S
=
±2V
to
±5V,
EN = V
–
V
OUT
=
±2V,
R
L
= 150Ω
V
OUT
=
±2V,
R
L
= 150Ω
R
L
= 0Ω
V
OUT
= 0V
EN Pin Voltage = 4.5V, R
L
= 150Ω
q
2
50
40
65
100
4.6
0.1
30
q
q
q
q
80
6.5
100
110
200
75
100
mA
µA
µA
µA
V/µs
ns
ns
ns
ns
%
ns
%
DEG
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)
A
V
= 10, R
L
= 150Ω
R
F
= R
G
= 324Ω, R
L
= 100Ω
R
F
= R
G
= 324Ω, R
L
= 100Ω
R
F
= R
G
= 324Ω, R
L
= 100Ω, V
OUT
= 1V
P-P
R
F
= R
G
= 324Ω, R
L
= 100Ω, V
OUT
= 1V
P-P
R
F
= R
G
= 324Ω, R
L
= 100Ω, V
OUT
= 1V
P-P
0.1%, A
V
= – 1, R
F
= R
G
= 309Ω, R
L
= 150Ω
R
F
= R
G
= 324Ω, R
L
= 150Ω
R
F
= R
G
= 324Ω, R
L
= 150Ω
500
800
30
40
1.3
2.5
10
25
0.13
0.10
sn13989 13989fas
3
LT1398/LT1399/LT1399HV
(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)
SYMBOL
V
OS
∆V
OS
/∆T
I
IN+
I
IN–
e
n
+ i
n
– i
n
R
IN
C
IN
C
OUT
V
INH
V
INL
V
OUTH
PARAMETER
Input Offset Voltage
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP
1.5
MAX
10
12
25
30
50
60
UNITS
mV
mV
µV/°C
µA
µA
µA
µA
nV/√Hz
pA/√Hz
pA/√Hz
MΩ
pF
pF
pF
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
dB
Input Offset Voltage Drift
Noninverting Input Current
q
q
15
10
10
Inverting Input Current
q
Input Noise Voltage Density
Noninverting Input Noise Current Density
Inverting Input Noise Current Density
Input Resistance
Input Capacitance
Output Capacitance
Input Voltage Range, High
Input Voltage Range, Low
Maximum Output Voltage Swing, High
f = 1kHz, R
F
= 1k, R
G
= 10Ω, R
S
= 0Ω, V
S
=
±5V
f = 1kHz, V
S
=
±5V
f = 1kHz, V
S
=
±5V
V
IN
=
±6V
Amplifier Enabled
Amplifier Disabled
Amplifier Disabled
V
S
=
±7.5V
V
S
= 7.5V, 0V
V
S
=
±7.5V
V
S
= 7.5V, 0V
V
S
=
±7.5V,
R
L
= 100k
V
S
=
±7.5V,
R
L
= 100k
V
S
= 7.5V, 0V; R
L
= 100k
V
S
=
±7.5V,
R
L
= 100k
V
S
=
±7.5V,
R
L
= 100k
V
S
= 7.5V, 0V; R
L
= 100k
V
S
=
±7.5V,
R
L
= 150Ω
V
S
=
±7.5V,
R
L
= 150Ω
V
S
= 7.5V, 0V; R
L
= 150Ω
V
S
=
±7.5V,
R
L
= 150Ω
V
S
=
±7.5V,
R
L
= 150Ω
V
S
= 7.5V, 0V; R
L
= 150Ω
V
CM
=
±6V
V
CM
=
±6V
V
CM
=
±6V
V
S
=
±2V
to
±7.5V,
EN = V
–
V
S
=
±2V
to
±7.5V,
EN = V
–
q
q
q
q
4.5
6
25
0.3
1
2.0
2.5
8.5
6
–6
6.4
6.1
– 6.4
– 6.1
5.4
5.1
– 5.4
– 5.1
42
6.5
6.5
– 6.5
1.0
6.7
6.7
– 6.7
0.8
5.8
5.8
– 5.8
0.6
q
q
q
q
q
q
q
V
OUTL
Maximum Output Voltage Swing, Low
V
OUTH
Maximum Output Voltage Swing, High
V
OUTL
Maximum Output Voltage Swing, Low
CMRR
– I
CMRR
PSRR
+ I
PSRR
– I
PSRR
A
V
R
OL
I
OUT
I
S
I
EN
Common Mode Rejection Ratio
Inverting Input Current
Common Mode Rejection
Power Supply Rejection Ratio
Noninverting Input Current
Power Supply Rejection
Inverting Input Current
Power Supply Rejection
Large-Signal Voltage Gain
Transimpedance,
∆V
OUT
/∆I
IN–
Maximum Output Current
Supply Current per Amplifier
Disable Supply Current per Amplifier
Enable Pin Current
52
10
16
22
2
3
7
µA/V
µA/V
dB
µA/V
µA/V
µA/V
dB
kΩ
mA
56
70
1
V
S
=
±2V
to
±7.5V,
EN = V
–
V
OUT
=
±4.5V,
R
L
= 150Ω
V
OUT
=
±4.5V,
R
L
= 150Ω
R
L
= 0Ω
V
OUT
= 0V
EN Pin Voltage = 7V, R
L
= 150Ω
q
2
50
40
65
100
4.6
0.1
30
q
q
q
q
80
7
100
110
200
mA
µA
µA
µA
sn13989 13989fas
4
LT1398/LT1399/LT1399HV
(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)
SYMBOL
SR
t
ON
t
OFF
t
r
, t
f
t
PD
os
t
S
dG
dP
PARAMETER
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)
CONDITIONS
A
V
= 10, R
L
= 150Ω, V
S
=
±5V
R
F
= R
G
= 324Ω, R
L
= 100Ω, V
S
=
±5V
R
F
= R
G
= 324Ω, R
L
= 100Ω, V
S
=
±5V
R
F
= R
G
= 324Ω, R
L
= 100Ω, V
OUT
= 1V
P-P
,
V
S
=
±5V
R
F
= R
G
= 324Ω, R
L
= 100Ω, V
OUT
= 1V
P-P
,
V
S
=
±5V
R
F
= R
G
= 324Ω, R
L
= 100Ω, V
OUT
= 1V
P-P
,
V
S
=
±5V
0.1%, A
V
= – 1V, R
F
= R
G
= 309Ω, R
L
= 150Ω,
V
S
=
±5V
R
F
= R
G
= 324Ω, R
L
= 150Ω, V
S
=
±5V
R
F
= R
G
= 324Ω, R
L
= 150Ω, V
S
=
±5V
MIN
500
TYP
800
30
40
1.3
2.5
10
25
0.13
0.10
75
100
MAX
UNITS
V/µs
ns
ns
ns
ns
%
ns
%
DEG
ELECTRICAL CHARACTERISTICS
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 LT1398C/LT1399C/LT1399HVC 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
or QA sampled at – 40°C and 85°C. The LT1399I is guaranteed to meet
specified performance from –40°C to 85°C.
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, LT1399IS, LT1399HVCS:
T
J
= T
A
+ (P
D
• 100°C/W)
LT1399CGN, LT1399IGN: 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°.
Note 9:
The LT1398C, LT1398I, LT1399C, LT1399I, LT1399HVC and
LT1399HVI are guaranteed functional over the operating temperature
range of –40°C to 85°C.
TYPICAL AC PERFOR A CE
V
S
(V)
±5
±5
±5
A
V
1
2
–1
R
L
(Ω)
100
100
100
R
F
(Ω)
365
324
309
R
G
(Ω)
–
324
309
SMALL SIGNAL
– 3dB BW (MHz)
300
300
300
SMALL SIGNAL
0.1dB BW (MHz)
150
150
150
SMALL SIGNAL
PEAKING (dB)
0.05
0
0
U W
sn13989 13989fas
5
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