LT1395/LT1396/LT1397
Single/Dual/Quad 400MHz
Current Feedback Amplifier
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
400MHz Bandwidth on
±
5V (A
V
= 1)
350MHz Bandwidth on
±
5V (A
V
= 2, –1)
0.1dB Gain Flatness: 100MHz (A
V
= 1, 2 and –1)
High Slew Rate: 800V/µs
Wide Supply Range:
±2V(4V)
to
±6V(12V)
80mA Output Current
Low Supply Current: 4.6mA/Amplifier
LT1395: SO-8 Package
LT1396: SO-8 and MSOP Packages
LT1397: SO-14 and SSOP-16 Packages
The LT
®
1395/LT1396/LT1397 are single/dual/quad
400MHz current feedback amplifiers with an 800V/µs slew
rate and the ability to drive up to 80mA of output current.
The LT1395/LT1396/LT1397 operate on all supplies from
a single 4V to
±6V.
At
±5V,
they draw 4.6mA of supply
current per amplifier.
The LT1395/LT1396/LT1397 are manufactured on Linear
Technology’s proprietary complementary bipolar process.
They have standard single/dual/quad pinouts and they are
optimized for use on supply voltages of
±5V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
Cable Drivers
Video Amplifiers
MUX Amplifiers
High Speed Portable Equipment
IF Amplifiers
TYPICAL APPLICATIO
R
G1
1.02k
R
F1
255Ω
Unity-Gain Video Loop-Through Amplifier
R
G2
63.4Ω
R
F2
255Ω
10
0
–
3.01k
V
IN –
1/2
LT1396
–
3.01k V
IN+
1/2
LT1396
–10
GAIN (dB)
V
OUT
–20
–30
–40
COMMON MODE SIGNAL
–50
–60
100
+
0.67pF
+
1% RESISTORS
FOR A GAIN OF G:
V
OUT
= G (V
IN+
– V
IN –
)
R
F1
= R
F2
R
G1
= (G + 3) R
F2
R
R
G2
=
F2
G+3
TRIM CMRR WITH R
G1
1395/6/7 TA01
0.67pF
12.1k
12.1k
BNC INPUTS
HIGH INPUT RESISTANCE DOES NOT LOAD CABLE
EVEN WHEN POWER IS OFF
U
Loop-Through Amplifier
Frequency Response
NORMAL SIGNAL
1k
10k 100k
1M
10M 100M 1G
1395/6/7 TA02
U
U
FREQUENCY (Hz)
1
LT1395/LT1396/LT1397
ABSOLUTE
AXI U
RATI GS
Total Supply Voltage (V
+
to V
–
) ........................... 12.6V
Input Current (Note 2) .......................................
±10mA
Output Current .................................................
±100mA
Differential Input Voltage (Note 2) ...........................
±5V
Output Short-Circuit Duration (Note 3) ........ Continuous
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC 1
–IN 2
+IN 3
V
–
4
–
+
8
7
6
5
NC
V+
OUT
NC
OUT A
–IN A
+IN A
V
–
1
2
3
4
MS8 PACKAGE
8-LEAD PLASTIC MSOP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W
T
JMAX
= 150°C,
θ
JA
= 250°C/W
ORDER PART NUMBER
LT1395CS8
S8 PART MARKING
1395
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
+
4
+
–
–
+
14 OUT D
– 13 –IN D
+
12 +IN D
11
V
–
ORDER PART NUMBER
LT1396CMS8
MS8 PART MARKING
LTDY
+IN B 5
–IN B 6
OUT B 7
+ 10 +IN C
–
9 –IN C
8
OUT C
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 100°C/W
ORDER PART NUMBER
LT1397CS
Consult factory for Industrial and Military grade parts.
2
U
U
W
W W
U
W
(Note 1)
Operating Temperature Range (Note 4) . – 40°C to 85°C
Specified Temperature Range (Note 5) .. – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Junction Temperature (Note 6) ............................ 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
TOP VIEW
–
+
TOP VIEW
–
+
8
7
6
5
V+
OUT B
–IN A
+IN B
OUT A 1
–IN A 2
+IN A 3
V
–
4
–
+
8
7
–
+
6
5
V+
OUT B
–IN A
+IN B
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W
ORDER PART NUMBER
LT1396CS8
S8 PART MARKING
1396
TOP VIEW
OUT A
–IN A
+IN A
V
+
+IN B
–IN B
OUT B
NC
1
2
3
4
5
6
7
8
+
–
–
+
16 OUT D
– 15 –IN D
+
14 +IN D
13 V
–
+ 12 +IN C
–
11 –IN C
10 OUT C
9
NC
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 135°C/W
ORDER PART NUMBER
LT1397CGN
GN PART MARKING
1397
LT1395/LT1396/LT1397
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,
pulse tested, unless otherwise noted. (Note 5)
SYMBOL
V
OS
∆V
OS
/∆T
I
IN+
I
IN–
e
n
+ i
n
– i
n
R
IN
C
IN
V
INH
V
INL
V
OUTH
PARAMETER
Input Offset Voltage
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP
1
MAX
±10
±12
±25
±30
±50
±60
UNITS
mV
mV
µV/°C
µA
µA
µA
µA
nV/√Hz
pA/√Hz
pA/√Hz
MΩ
pF
V
V
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
Input Voltage Range, High
Input Voltage Range, Low
Output Voltage Swing, High
f = 1kHz, R
F
= 1k, R
G
= 10Ω, R
S
= 0Ω
f = 1kHz
f = 1kHz
V
IN
=
±3.5V
V
S
=
±5V
V
S
= 5V, 0V
V
S
=
±5V
V
S
= 5V, 0V
V
S
=
±5V
V
S
=
±5V
V
S
= 5V, 0V
V
S
=
±5V
V
S
=
±5V
V
S
= 5V, 0V
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
V
S
=
±2V
to
±5V
q
q
4.5
6
25
0.3
3.5
1
2.0
q
q
4.0
4.0
– 4.0
1.0
– 3.5
V
V
V
V
V
q
3.9
3.7
4.2
4.2
– 4.2
V
OUTL
Output Voltage Swing, Low
q
– 3.9
– 3.7
0.8
q
V
V
V
V
V
V
V
OUTH
Output Voltage Swing, High
3.4
3.2
3.6
3.6
– 3.6
V
OUTL
Output Voltage Swing, Low
q
– 3.4
– 3.2
0.6
q
q
q
V
V
V
dB
µA/V
µA/V
dB
µA/V
µA/V
µA/V
dB
kΩ
mA
CMRR
– I
CMRR
PSRR
+ I
PSRR
– I
PSRR
A
V
R
OL
I
OUT
I
S
SR
– 3dB BW
0.1dB BW
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
Slew Rate (Note 7)
–3dB Bandwidth
0.1dB Bandwidth
42
52
10
16
22
2
3
7
56
70
1
V
S
=
±2V
to
±5V
V
OUT
=
±2V,
R
L
= 150Ω
V
OUT
=
±2V,
R
L
= 150Ω
R
L
= 0Ω
A
V
= – 1, R
L
= 150Ω
A
V
= 1, R
F
= 374Ω, R
L
= 100Ω
A
V
= 2, R
F
= R
G
= 255Ω, R
L
= 100Ω
A
V
= 1, R
F
= 374Ω, R
L
= 100Ω
A
V
= 2, R
F
= R
G
= 255Ω, R
L
= 100Ω
q
2
50
40
65
100
4.6
500
800
400
300
100
100
q
q
80
6.5
mA
V/µs
MHz
MHz
MHz
MHz
3
LT1395/LT1396/LT1397
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,
pulse tested, unless otherwise noted. (Note 5)
SYMBOL
t
r
, t
f
t
PD
os
t
S
dG
dP
PARAMETER
Small-Signal Rise and Fall Time
Propagation Delay
Small-Signal Overshoot
Settling Time
Differential Gain (Note 8)
Differential Phase (Note 8)
CONDITIONS
R
F
= R
G
= 255Ω, R
L
= 100Ω, V
OUT
= 1V
P-P
R
F
= R
G
= 255Ω, R
L
= 100Ω, V
OUT
= 1V
P-P
R
F
= R
G
= 255Ω, R
L
= 100Ω, V
OUT
= 1V
P-P
0.1%, A
V
= – 1, R
F
= R
G
= 280Ω, R
L
= 150Ω
R
F
= R
G
= 255Ω, R
L
= 150Ω
R
F
= R
G
= 255Ω, R
L
= 150Ω
MIN
TYP
1.3
2.5
10
25
0.02
0.04
MAX
UNITS
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 LT1395C/LT1396C/LT1397C are guaranteed functional over
the operating temperature range of – 40°C to 85°C.
Note 5:
The LT1395C/LT1396C/LT1397C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1395C/LT1396C/LT1397C are
designed, characterized and expected to meet specified performance from
– 40°C and 85°C but is not tested or QA sampled at these temperatures.
For guaranteed I-grade parts, consult the factory.
Note 6:
T
J
is calculated from the ambient temperature T
A
and the
power dissipation P
D
according to the following formula:
LT1395CS8: T
J
= T
A
+ (P
D
• 150°C/W)
LT1396CS8: T
J
= T
A
+ (P
D
• 150°C/W)
LT1396CMS8: T
J
= T
A
+ (P
D
• 250°C/W)
LT1397CS14: T
J
= T
A
+ (P
D
• 100°C/W)
LT1397CGN16: T
J
= T
A
+ (P
D
• 135°C/W)
Note 7:
Slew rate is measured at
±2V
on a
±3V
output signal.
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°.
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)
374
255
280
R
G
(Ω)
–
255
280
SMALL SIGNAL
– 3dB BW (MHz)
400
350
350
SMALL SIGNAL
0.1dB BW (MHz)
100
100
100
SMALL SIGNAL
PEAKING (dB)
0.1
0.1
0.1
TYPICAL PERFOR A CE CHARACTERISTICS
Closed-Loop Gain vs Frequency
(A
V
= 1)
Closed-Loop Gain vs Frequency
(A
V
= 2)
Closed-Loop Gain vs Frequency
(A
V
= – 1)
0
GAIN (dB)
GAIN (dB)
–2
–4
–6
GAIN (dB)
1M
10M
100M
V
S
=
±5V
FREQUENCY (Hz)
V
IN
= –10dBm
R
F
= R
G
= 255Ω
R
L
= 100Ω
1G
1397 G02
1M
10M
100M
V
S
=
±5V
FREQUENCY (Hz)
V
IN
= –10dBm
R
F
= 374Ω
R
L
= 100Ω
1G
1397 G01
4
U W
U W
6
4
2
0
0
–2
–4
–6
1M
10M
100M
V
S
=
±5V
FREQUENCY (Hz)
V
IN
= –10dBm
R
F
= R
G
= 280Ω
R
L
= 100Ω
1G
1397 G03
LT1395/LT1396/LT1397
TYPICAL PERFOR A CE CHARACTERISTICS
Large-Signal Transient Response
(A
V
= 1)
Large-Signal Transient Response
(A
V
= 2)
Large-Signal Transient Response
(A
V
= – 1)
OUTPUT (1V/DIV)
OUTPUT (1V/DIV)
V
S
=
±5V
V
IN
=
±2.5V
R
F
= 374Ω
R
L
= 100Ω
TIME (10ns/DIV)
1395/6/7 G04
V
S
=
±5V
TIME (10ns/DIV)
V
IN
=
±1.25V
R
F
= R
G
= 255Ω
R
L
= 100Ω
1395/6/7 G05
OUTPUT (1V/DIV)
2nd and 3rd Harmonic Distortion
vs Frequency
30
8
7
OUTPUT VOLTAGE (V
P-P
)
DISTORTION (dB)
T
A
= 25°C
40 R
F
= R
G
= 255Ω
R
L
= 100Ω
V
S
=
±
5V
50
V
OUT
= 2VPP
60
70
80
90
100
110
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
1397 G07
5
4
3
2
1M
10M
FREQUENCY (Hz)
100M
1397 G08
PSRR (dB)
HD3
HD2
Input Voltage Noise and Current
Noise vs Frequency
1000
INPUT NOISE (nV/√Hz OR pA/√Hz)
100
OUTPUT IMPEDANCE (Ω)
100
CAPACITIVE LOAD (pF)
–i
n
10
e
n
+i
n
1
10
30
100 300 1k 3k 10k 30k 100k
FREQUENCY (Hz)
1397 G10
U W
V
S
=
±5V
TIME (10ns/DIV)
V
IN
=
±2.5V
R
F
= R
G
= 280Ω
R
L
= 100Ω
1395/6/7 G06
Maximum Undistorted Output
Voltage vs Frequency
80
70
PSRR vs Frequency
A
V
= +1
6
A
V
= +2
60
50
40
30
20
10
T
A
= 25°C
R
F
= R
G
= 255Ω
R
L
= 100Ω
A
V
= +2
100k
1M
10M
FREQUENCY (Hz)
100M
1397 G09
– PSRR
+ PSRR
T
A
= 25°C
R
F
= 374Ω (A
V
= 1)
R
F
= R
G
= 255Ω (A
V
= 2)
R
L
= 100Ω
V
S
=
±
5V
0
10k
Output Impedance vs Frequency
1000
R
F
= R
G
= 255Ω
R
L
= 50Ω
A
V
= +2
V
S
=
±
5V
Maximum Capacitive Load
vs Feedback Resistor
10
100
1
10
R
F
= R
G
A
V
= +2
V
S
=
±
5V
PEAKING
≤
5dB
900
1500
2100
2700
FEEDBACK RESISTANCE (Ω)
3300
1397 G13
0.1
0.01
10k
100k
1M
10M
FREQUENCY (Hz)
100M
1397 G11
1
300
5
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