LT1190 Datasheet by Analog Devices Inc.

LTLIHI "p LTHQO TECHNOLOGY L7 L7LJDE/3B
1
LT1190
Video MUX Cable Driver
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
Ultrahigh Speed
Operational Amplifier
Gain Bandwidth Product, A
V
= 1: 50MHz
Slew Rate: 450V/µs
Low Cost
Output Current: ±50mA
Settling Time: 140ns to 0.1%
Differential Gain Error: 0.1%, (R
L
= 1k)
Differential Phase Error: 0.06°, (R
L
= 1k)
High Open-Loop Gain: 10V/mV Min
Single Supply 5V Operation
Output Shutdown
Video Cable Drivers
Video Signal Processing
Fast Integrators
Pulse Amplifiers
D/A Current to Voltage Conversion
The LT
®
1190 is a video operational amplifier optimized for
operation on ±5V, and a single 5V supply. Unlike many
high speed amplifiers, this amplifier features high open-
loop gain, over 85dB, and the ability to drive heavy loads
to a full-power bandwidth of 20MHz at 7V
P-P
. In addition
to its very fast slew rate, the LT1190 features a unity-
gain-stable bandwidth of 50MHz and a 75° phase margin,
making it extremely easy to use.
Because the LT1190 is a true operational amplifier, it is an
ideal choice for wideband signal conditioning, fast inte-
grators, active filters, and applications requiring speed,
accuracy and low cost.
The LT1190 is available in 8-pin PDIP and SO packages
with standard pinouts. The normally unused Pin 5 is used
for a shutdown feature that shuts off the output and
reduces power dissipation to a mere 15mW.
TYPICAL APPLICATIO
U
LT1190 • TA01
+
5V
7
VIN1
VIN2
6
5
LT1190
SHDN
–5V
4
1k
1k
1k
3
2
75
75
CABLE
74HC04 74HC04
+
5V
76
5
LT1190
SHDN
–5V
4
3
2
1k 1k
–5V
1k
CMOS IN
CH. SELECT
Inverter Pulse Response
A
V
= –1, C
L
= 10pF SCOPE PROBE 1190 TA02
PfiCHflGE/OBDEB I FOB flTIOI'I flflflfl UUUU LTHIJEAB
2
LT1190
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
Total Supply Voltage (V
+
to V
) ............................. 18V
Differential Input Voltage ....................................... ±6V
Input Voltage .......................................................... ±V
S
Output Short-Circuit Duration (Note 2)........ Continuous
Maximum Junction Temperature ......................... 150°C
Operating Temperature Range
LT1190M (OBSOLETE) ............. –55°C to 125°C
LT1190C............................................... 0°C to 70°C
Storage Temperature Range .................65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
LT1190CN8
LT1190CS8
1190
S8 PART MARKING
1
2
3
4
8
7
6
5
TOP VIEW
BAL
V
+
OUT
SHDN
BAL
–IN
+IN
V
N8 PACKAGE
8-LEAD PDIP S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C, θ
JA
= 100°C/W (N8)
T
JMAX
= 150°C, θ
JA
= 150°C/W (S8)
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
LT1190MJ8
LT1190CJ8
J8 PACKAGE 8-LEAD CERDIP
T
JMAX
= 150°C, θ
JA
= 100°C/W
OBSOLETE PACKAGE
LT1190M/C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage N8 Package 3 10 mV
SO-8 Package 15 mV
I
OS
Input Offset Current 0.2 1.7 µA
I
B
Input Bias Current ±0.5 ±2.5 µA
e
n
Input Noise Voltage f
O
= 10kHz 50 nV/Hz
i
n
Input Noise Current f
O
= 10kHz 4 pA/Hz
R
IN
Input Resistance Differential Mode 130 k
Common Mode 5 M
C
IN
Input Capacitance A
V
= 1 2.2 pF
Input Voltage Range (Note 3) 2.5 3.5 V
CMRR Common Mode Rejection Ratio V
CM
= – 2.5V to 3.5V 60 70 dB
PSRR Power Supply Rejection Ratio V
S
= ±2.375V to ±8V 60 70 dB
A
VOL
Large-Signal Voltage Gain R
L
= 1k, V
O
= ±3V 10 22 V/mV
R
L
= 100, V
O
= ±3V 2.5 6 V/mV
V
S
= ±8V, R
L
= 100, V
O
= ±5V 3.5 12 V/mV
V
OUT
Output Voltage Swing V
S
= ±5V, R
L
= 1k ±3.7 ±4V
V
S
= ±8V, R
L
= 1k ±6.7 ±7V
SR Slew Rate A
V
= –1, R
L
= 1k (Notes 4, 9) 325 450 V/µs
FPBW Full-Power Bandwidth V
O
= 6V
P-P
(Note 5) 17.2 23.9 MHz
GBW Gain Bandwidth Product 50 MHz
t
r1
, t
f1
Rise Time, Fall Time A
V
= 50, V
O
= ±1.5V, 20% to 80%, (Note 9) 175 250 325 ns
t
r2
, t
f2
Rise Time, Fall Time A
V
= 1, V
O
= ±125mV, 10% to 90% 1.9 ns
t
PD
Propagation Delay A
V
= 1, V
O
= ±125mV, 50% to 50% 2.4 ns
Overshoot A
V
= 1, V
O
= ±125mV 5 %
t
s
Settling Time 3V Step, 0.1% (Note 6) 140 ns
ELECTRICAL CHARACTERISTICS
VS = ±5V, TA = 25°C, CL 10pF, Pin 5 open circuit unless otherwise noted.
Consider the N8 or S8 Packages for Alternate Source
0910 Ground L7UHEN2
3
LT1190
LT1190M
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage N8 Package 514 mV
V
OS
/T Input V
OS
Drift 16 µV/°C
I
OS
Input Offset Current 0.2 2 µA
I
B
Input Bias Current ±0.5 ±2.5 µA
CMRR Common Mode Rejection Ratio V
CM
= –2.5V to 3.5V 55 70 dB
PSRR Power Supply Rejection Ratio V
S
= ±2.375V to ±5V 55 70 dB
A
VOL
Large-Signal Voltage Gain R
L
= 1k, V
O
= ±3V 816 V/mV
R
L
= 100, V
O
= ±3V 1 2.5 V/mV
V
OUT
Output Voltage Swing R
L
= 1k ±3.7 ±3.9 V
I
S
Supply Current 32 38 mA
Shutdown Supply Current Pin 5 at V
(Note 8) 1.5 2.5 mA
I
SHDN
Shutdown Pin Current Pin 5 at V
20 µA
LT1190M/C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Diff A
V
Differential Gain R
L
= 150Ω, A
V
= 2 (Note 7) 0.35 %
Diff Ph Differential Phase R
L
= 150, A
V
= 2 (Note 7) 0.16 Deg
P-P
I
S
Supply Current 32 38 mA
Shutdown Supply Current Pin 5 at V
1.3 2 mA
I
SHDN
Shutdown Pin Current Pin 5 at V
20 50 µA
t
ON
Turn On Time Pin 5 from V
to Ground, R
L
= 1k 100 ns
t
OFF
Turn Off Time Pin 5 from Ground to V
, R
L
= 1k 400 ns
VS = ±5V, TA = 25°C, CL 10pF, Pin 5 open circuit unless otherwise noted.
LT1190M/C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage N8 Package 3 11 mV
SO-8 Package 15 mV
I
OS
Input Offset Current 0.2 1.2 µA
I
B
Input Bias Current ±0.5 ±1.5 µA
Input Voltage Range (Note 3) 2 3.5 V
CMRR Common Mode Rejection Ratio V
CM
= 2V to 3.5V 55 70 dB
A
VOL
Large-Signal Voltage Gain R
L
= 100to Ground, V
O
= 1V to 3V 2.5 7 V/mV
V
OUT
Output Voltage Swing R
L
= 100to Ground V
OUT
High 3.6 3.8 V
V
OUT
Low 0.25 0.4 V
SR Slew Rate A
V
= –1, V
O
= 1V to 3V 250 V/µs
GBW Gain Bandwidth Product 47 MHz
I
S
Supply Current 24.5 29 36 mA
Shutdown Supply Current Pin 5 at V
1.2 2 mA
I
SHDN
Shutdown Pin Current Pin 5 at V
20 50 µA
VS+ = 5V, VS = 0V, VCM = 2.5V, TA = 25°C, CL 10pF, Pin 5 open circuit unless otherwise noted.
ELECTRICAL CHARACTERISTICS
The denotes the specifications which apply over the full operating temperature range of –55°C TA 125°C.
VS = ±5V, Pin 5 open circuit unless otherwise noted.
LTHIJEAB
4
LT1190
LT1190 • TA03
+
5V
7
6
LT1190
3
2
–5V
4
1
8
INPUT OFFSET VOLTAGE CAN BE ADJUSTED OVER A ±150mV
RANGE WITH A 1k TO 10k POTENTIOMETER
Optional Offset Nulling Circuit
LT1190C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage N8 Package 311 mV
SO-8 Package 18 mV
V
OS
/T Input V
OS
Drift 16 µV/°C
I
OS
Input Offset Current 0.2 1.7 µA
I
B
Input Bias Current ±0.5 ±2.5 µA
CMRR Common Mode Rejection Ratio V
CM
= – 2.5V to 3.5V 58 70 dB
PSRR Power Supply Rejection Ratio V
S
= ±2.375V to ±5V 58 70 dB
A
VOL
Large-Signal Voltage Gain R
L
= 1k, V
O
= ±3V 920 V/mV
R
L
= 100, V
O
= ±3V 2 6 V/mV
V
OUT
Output Voltage Swing R
L
= 1k ±3.7 ±3.9 V
I
S
Supply Current 32 38 mA
Shutdown Supply Current Pin 5 at V
(Note 8) 1.4 2.1 mA
I
SHDN
Shutdown Pin Current Pin 5 at V
20 µA
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
Note 2: A heat sink is required to keep the junction temperature below
absolute maximum when the output is shorted.
Note 3: Exceeding the input common mode range may cause the output
to invert.
Note 4: Slew rate is measured between ±1V on the output, with a ±3V
input step.
Note 5: Full-power bandwidth is calculated from the slew rate
measurement:
FPBW = SR/2πV
P
.
Note 6: Settling time measurement techniques are shown in “Take the
Guesswork Out of Settling Time Measurements,” EDN, September 19,
1985. A
V
= –1, R
L
= 1k.
Note 7: NTSC (3.58MHz). For R
L
= 1k, Diff A
V
= 0.1%, Diff Ph = 0.06°.
Note 8: See Applications section for shutdown at elevated temperatures.
Do not operate the shutdown above T
J
> 125°C.
Note 9: AC parameters are 100% tested on the ceramic and plastic DIP
packaged parts (J and N suffix) and are sample tested on every lot of the
SO packaged parts (S suffix).
The denotes the specifications which apply over the full operating
temperature range of 0°C TA 70°C. VS = ±5V, Pin 5 open circuit unless otherwise noted.
ELECTRICAL CHARACTERISTICS
”H
5
LT1190
Input Bias Current
vs Common Mode Voltage
TYPICAL PERFOR A CE CHARACTERISTICS
UW
COMMON MODE VOLTAGE (V)
–4
–2
INPUT BIAS CURRENT (µA)
–1
0
1
2
3
4
–2 0 2 4
LT1190 • TPC01
–3 –1 1 3
125°C
–55°C
25°C
V
S
= ±5V
TEMPERATURE (°C)
–50
0.8
INPUT BIAS CURRENT (µA)
0.7
0.6
0.5
0.4
0.3
0 25 75 125
LT1190 • TPC02
25 50 100
+I
B
–I
B
V
S
= ±5V
I
OS
±V SUPPLY VOLTAGE (V)
0
–10
COMMON MODE VOLTAGE (V)
–6
–2
0
4
6
10
4810
LT1190 • TPC03
8
2
–4
–8
26
–55°C
25°C
125°C
–55°C
25°C
+V COMMON MODE
V COMMON MODE
125 C
°
Input Bias Current
vs Temperature Common Mode Voltage
vs Supply Voltage
Equivalent Input Noise Voltage
vs Frequency Equivalent Input Noise Current
vs Frequency Supply Current vs Supply Voltage
FREQUENCY (Hz)
400
EQUIVALENT INPUT NOISE VOLTAGE (nV/ Hz)
800
1200
1600
2000
10 1k 10k 100k
LT1190 • TPC04
0100
1800
1400
1000
600
200
V
S
= ±5V
T
A
= 25°C
R
S
= 0
FREQUENCY (Hz)
20
EQUIVALENT INPUT NOISE CURRENT (pA/ Hz)
60
80
10 1k 10k 100k
LT1190 • TPC05
0100
40
VS = ±5V
TA = 25°C
RS = 100k
±SUPPLY VOLTAGE (V)
0
0
SUPPLY CURRENT (mA)
10
20
30
40
246 10
LT1190 • TPC06
8
–55°C
125°C
25°C
Shutdown Supply Current
vs Temperature Open-Loop Voltage Gain
vs Temperature
TEMPERATURE (°C)
–50
1.0
SHUTDOWN SUPPLY CURRENT (mA)
1.5
2.5
3.0
4.0
4.5
5.0
0 25 75 125
LT1190 • TPC07
3.5
2.0
25 50 100
VS = ±5V
VSHDN = –VEE + 0.4V
VSHDN = –VEE + 0.2V
VSHDN = –VEE
TEMPERATURE (°C)
–50
0
OPEN-LOOP VOLTAGE GAIN (V/V)
20k
30k
0 25 75 125
LT1190 • TPC08
25 50 100
V
S
= ±5V
V
O
= ±3V R
L
= 1k
R
L
= 100
10k
Open-Loop Voltage Gain
vs Load Resistance
LOAD RESISTANCE ()
10
0
OPEN-LOOP VOLTAGE GAIN (V/V)
10k
20k
30k
100 1000
LT1190 • TPC09
VS = ±5V
VO = ±3V
«Vow 25°C um. 755% ivw‘ 755°C 25% um L7L|HEN2
6
LT1190
Gain, Phase vs Frequency
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Gain Bandwidth Product
vs Supply Voltage Output Impedance vs Frequency
Unity Gain Frequency and
Phase Margin vs Temperature Common Mode Rejection Ratio
vs Frequency Power Supply Rejection Ratio
vs Frequency
Output Short-Circut Current
vs Temperature Output Swing vs Supply Voltage Output Voltage Swing
vs Load Resistance
FREQUENCY (Hz)
0
VOLTAGE GAIN (dB)
20
60
80
100
100k
LT1190 • TPC10
–20 1M 10M 100M 1G
40
GAIN
0
PHASE MARGIN (DEGREES)
20
60
80
100
–20
40
V
S
= ±5V
T
A
= 25°C
R
L
= 1k
PHASE
±V SUPPLY VOLTAGE (V)
0
25
GAIN BANDWIDTH PRODUCT (MHz)
30
35
40
45
50
55
24 810
LT1190 • TPC11
6
T
A
= –55°C, 25°C, 125°C
FREQUENCY (Hz)
0.01
OUTPUT IMPEDANCE ( )
0.1
1
10
100
1k
LT1190 • TPC12
10k 100k 1M 10M 100M
VS = ±5V
TA = 25°C
AV = –100
AV = –1
AV = –10
TEMPERATURE (°C)
–50
40
UNITY GAIN FREQUENCY (MHz)
45
55
60
65
75
80
0 50 100 125
LT1190 • TPC13
70
50
–25 25 75 40
PHASE MARGIN (DEGREES)
45
55
60
65
75
80
70
50
UNITY GAIN FREQUENCY
PHASE MARGIN
V
S
= ±5V
R
L
= 1k
FREQUENCY (Hz)
10
COMMON MODE REJECTION RATIO (dB)
30
40
50
60
100k 10M 100M 1G
LT1190 • TPC14
01M
20
V
S
= ±5V
T
A
= 25°C
R
L
= 1k
FREQUENCY (Hz)
0
POWER SUPPLY REJECTION RATIO (dB)
20
40
60
80
1k 100k 10M 100M
LT1190 • TPC15
–20 10k 1M
V
S
= ±5V
V
RIPPLE
= ±300mV
T
A
= 25°C
PSRR
+PSRR
TEMPERATURE (°C)
–50
70
OUTPUT SHORT-CIRCUIT CURRENT (mA)
90
100
0 25 75 125
LT1190 • TPC16
25 50 100
V
S
= ±5V
80
±V SUPPLY VOLTAGE (V)
0
–10
OUTPUT SWING (V)
–8
–6
–2
10
24 6 10
LT1190 • TPC17
–4
0
2
4
6
8R
L
= 1k
–V
OUT
, –55°C,
25°C, 125°C
8
+V
OUT
, 25°C,
125°C, –55°C
LOAD RESISTANCE ()
10
–5
OUTPUT VOLTAGE SWING (V)
–3
1
5
100 1000
LT1190 • TPC18
VS = ±5V
3
–1
TA = –55°C
TA = 25°C
TA = 125°C
TA = 125°C
TA = –55°C, 25°C
7
LT1190
Slew Rate vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Output Voltage Step
vs Settling Time, AV = –1 Output Voltage Step
vs Settling Time, AV = +1
TEMPERATURE (°C)
–50
300
SLEW RATE (V/ s)
400
500
600
25 125
LT1190 • TPC19
µ
0 25 50 75 100
V
S
= ±5V
T
A
= 25°C
R
L
= 1k
V
O
= ±2V
+SLEW RATE
SLEW RATE
SETTLING TIME (ns)
50
–4
OUTPUT VOLTAGE STEP (V)
–2
2
4
70 190
LT1190 • TPC20
90 110 130 150 170
1mV
1mV
10mV
10mV
V
S
= ±5V
T
A
= 25°C
R
L
= 1k
0
SETTLING TIME (ns)
0
–4
OUTPUT VOLTAGE STEP (V)
–2
0
4
50 350
LT1190 • TPC21
100 150 200 250 300
1mV
10mV
10mV
21mV
V
S
= ±5V
T
A
= 25°C
R
L
= 1k
Large-Signal Transient Response Small-Signal Transient Response Output Overload
A
V
= +1, C
L
= 10pF SCOPE PROBE 1190 G22 A
V
= +1, SMALL-SIGNAL RISE TIME, 1190 G23
WITH FET PROBES A
V
= –1, V
IN
= 12V
P-P
1190 G24
LTHIJEAB
8
LT1190
In most applications, and those requiring good settling
time, it is important to use multiple bypass capacitors. A
0.1µF ceramic disc in parallel with a 4.7µF tantalum is
recommended. Two oscilloscope photos with different
bypass conditions are used to illustrate the settling time
characteristics of the amplifier. Note that although the
output waveform looks acceptable at 1V/DIV, when ampli-
fied to 1mV/DIV the settling time to 2mV is 4.244µs for the
0.1µF bypass; the time drops to 163ns with multiple
bypass capacitors.
Power Supply Bypassing
The LT1190 is quite tolerant of power supply bypassing.
In some applications a 0.1µF ceramic disc capacitor
placed 1/2 inch from the amplifier is all that is required. A
scope photo of the amplifier output with no supply
bypassing is used to demonstrate this bypassing toler-
ance, RL = 1k.
Supply bypassing can also affect the response in the
frequency domain. It is possible to see a slight 1dB rise in
the frequency response at 130MHz depending on the gain
configuration, supply bypass, inductance in the supply
leads and printed circuit board layout. This can be further
minimized by not using a socket.
Closed-Loop Voltage Gain vs Frequency
Settling Time Good Bypass
Settling Time Poor Bypass
No Supply Bypass Capacitors
APPLICATIO S I FOR ATIO
WUUU
FREQUENCY (Hz)
CLOSED-LOOP VOLTAGE GAIN (dB)
20
10
0
–10
–20 1G
LT1190 • TA05
100M10M1M100k
V
S
= ±5V
T
A
= 25°C
R
L
= 1k
A
V
= 2
A
V
= 1
LT1190 • TA04
A
V
= –1, IN DEMO BOARD, R
L
= 1k
LT1190 • TA06
SETTLING TIME TO 2mV, A
V
= –1
SUPPLY BYPASS CAPACITORS = 0.1µF
LT1190 • TA07
SETTLING TIME TO 2mV, A
V
= –1
SUPPLY BYPASS CAPACITORS = 0.1µF + 4.7µF TANTALUM
V
OUT
1V/DIV
V
OUT
1mV/DIV
0V
V
OUT
1V/DIV
V
OUT
1mV/DIV
0V
L7UHEN2
9
LT1190
Output Shutdown
Output Shutdown
Cable Terminations
The LT1190 operational amplifier has been optimized as a
low cost video cable driver. The ±50mA guaranteed output
current enables the LT1190 to easily deliver 7.5V
P-P
into
100, while operating on ±5V supplies or 2.6V
P-P
on a
single 5V supply.
APPLICATIO S I FOR ATIO
WUUU
FREQUENCY (Hz)
CLOSED-LOOP VOLTAGE GAIN (dB)
10
8
6
4
2
0
–2
–4
–6
–8
–10
LT1190 • TA08
100M10M1M100k
V
S
= ±5V
T
A
= 25°C
A
V
= 2
R
FB
= 1k
R
G
= 330
A
V
= 1
R
FB
= 1k
R
G
= 1k
CABLE
2
+
5V
7
LT1190
–5V
4
36
Cable Driver Voltage Gain vs Frequency
Double Terminated Cable Driver
R
G
75
75
R
FB
When driving a cable it is important to terminate the cable
to avoid unwanted reflections. This can be done in one of
two ways: single termination or double termination. With
single termination, the cable must be terminated at the
receiving end (75 to ground) to absorb unwanted en-
ergy. The best performance can be obtained by double
termination (75 in series with the output of the amplifier,
and 75 to ground at the other end of the cable). This
termination is preferred because reflected energy is ab-
sorbed at each end of the cable. When using the double
termination technique it is important to note that the signal
is attenuated by a factor of 2, or 6dB. This can be compen-
sated for by taking a gain of 2, or 6dB in the amplifier. The
cable driver has a – 3dB bandwidth in excess of 30MHz
while driving the 150 load.
Using the Shutdown Feature
The LT1190 has a unique feature that allows the amplifier
to be shut down for conserving power or for multiplexing
several amplifiers onto a common cable. The amplifier will
shut down by taking Pin 5 to V
. In shutdown, the
amplifier dissipates 15mW while maintaining a true high
impedance output state of 15k in parallel with the
feedback resistors. The amplifiers must be used in a
noninverting configuration for MUX applications. In in-
verting configurations the input signal is fed to the output
through the feedback components. The following scope
photos show that with very high R
L
, the output is truly high
impedance; the output slowly decays toward ground.
Additionally, when the output is loaded with as little as 1k
the amplifier shuts off in 400ns. This shutoff can be under
the control of HC CMOS operating between 0V and – 5V.
LT1190 • TA09
1MHz SINE WAVE GATED OFF WITH
SHUTDOWN PIN, A
V
= 1, R
L
= SCOPE PROBE
V
OUT
–5V
0V
V
SHDN
LT1190 • TA10
1MHz SINE WAVE GATED OFF WITH
SHUTDOWN PIN, A
V
= 1, R
L
= 1k
V
OUT
–5V
0V
V
SHDN
LTHIJEAB
10
LT1190
A 1X Scope Probe Is a
Large Capacitive Load
An Unterminated Cable Is
a Large Capacitive Load
Murphy Circuits
Driving Capacitive Load Driving Capacitive Load
The ability to maintain shutoff is shown on the curve
Shutdown Supply Current vs Temperature in the Typical
Performance Characteristics section. At very high
elevated temperatures it is important to hold the shut-
down pin close to the negative supply to keep the supply
current from increasing.
Murphy Circuits
There are several precautions the user should take when
using the LT1190 in order to realize its full capability.
Although the LT1190 can drive a 50pF load, isolating the
capacitance with 10 can be helpful. Precautions prima-
rily have to do with driving large capacitive loads.
Other precautions include:
1. Use a ground plane (see Design Note 50, High Fre-
quency Amplifier Evaluation Board).
2. Do not use high source impedances. The input
capacitance of 2pF and R
S
= 10k for instance, will give
an 8MHz – 3dB bandwidth.
3. PC board socket may reduce stability.
4. A feedback resistor of 1k or lower reduces the effects of
stray capacitance at the inverting input. (For instance,
closed-loop gain of 2 can use R
FB
= 300 and R
G
=
300.)
APPLICATIO S I FOR ATIO
WUUU
LT1190 • TA13
COAX
5V
–5V
4
2
7
3
6
2
5V
7
–5V
4
3
6
SCOPE
PROBE
2
5V
7
–5V
4
3
6
1X SCOPE
PROBE
+
LT1190
+
LT1190
+
LT1190
A Scope Probe on the Inverting
Input Reduces Phase Margin
LT1190 • TA11
A
V
= –1, IN DEMO BOARD, C
L
= 50pF
LT1190 • TA12
A
V
= –1, IN DEMO BOARD, C
L
= 50pF
WITH 10 ISOLATING RESISTOR
é WLEH h§_i” 4 a £2 % é IE '—$ § WWI—WW “L WW ; 13L, L7UHEN2
11
LT1190
J8 1298
0.014 – 0.026
(0.360 – 0.660)
0.200
(5.080)
MAX
0.015 – 0.060
(0.381 – 1.524)
0.125
3.175
MIN
0.100
(2.54)
BSC
0.300 BSC
(0.762 BSC)
0.008 – 0.018
(0.203 – 0.457) 0° – 15°
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
CORNER LEADS OPTION
(4 PLCS)
0.045 – 0.065
(1.143 – 1.651)
0.005
(0.127)
MIN
0.405
(10.287)
MAX
0.220 – 0.310
(5.588 – 7.874)
1234
8765
0.025
(0.635)
RAD TYP
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SI PLIFIED SCHE ATIC
WW
+
VOUT
LT1190 • TA14
VBIAS VBIAS
CFF
+V+V
3
2
1 85
BAL BALSHDN
6
*
V+
7
V
4
*SUBSTRATE DIODE, DO NOT FORWARD BIAS
CM
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
J8 Package
8-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
OBSOLETE PACKAGE
”H“ flflflm 77) 9 uuuu HHHH MA 744457 7 iHHHH LTHIJEAB
12
LT1190
PART NUMBER DESCRIPTION COMMENTS
LT1357 High Speed Operational Amplifier 50MHz Gain Bandwidth, 800V/µs Slew Rate, I
S
= 5mA Max
LT1360 High Speed Operational Amplifier 25MHz Gain Bandwidth, 600V/µs Slew Rate, I
S
= 2.5mA Max
LINEAR TECHNOLOGY CORPORATION 1991
1190fa LT/CP 0801 1.5K REV A • PRINTED IN THE USA
RELATED PARTS
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
FAX: (408) 434-0507
www.linear.com
U
PACKAGE DESCRIPTIO
N8 1098
0.009 – 0.015
(0.229 – 0.381)
0.300 – 0.325
(7.620 – 8.255)
0.325 +0.035
0.015
+0.889
0.381
8.255
()
0.100
(2.54)
BSC
0.065
(1.651)
TYP
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.020
(0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.125
(3.175)
MIN 12 34
8765
0.255 ± 0.015*
(6.477 ± 0.381)
0.400*
(10.160)
MAX
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.016 – 0.050
(0.406 – 1.270)
0.010 – 0.020
(0.254 – 0.508)× 45°
0°8° TYP
0.008 – 0.010
(0.203 0.254)
SO8 1298
0.053 – 0.069
(1.346 1.752)
0.014 – 0.019
(0.355 – 0.483)
TYP
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
1234
0.150 – 0.157**
(3.810 – 3.988)
8765
0.189 – 0.197*
(4.801 – 5.004)
0.228 – 0.244
(5.791 – 6.197)
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)