LT1191
Ultrahigh Speed
Operational Amplifier
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FEATURES
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DESCRIPTIO
The LT®1191 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 90dB, and the ability to drive heavy loads to a
full-power bandwidth of 20MHz at 7VP-P. In addition to its
very fast slew rate, the LT1191 features a unity-gain-stable
bandwidth of 90MHz.
Gain Bandwidth Product, AV = 1: 90MHz
Slew Rate: 450V/µs
Low Cost
Output Current: ±50mA
Settling Time: 110ns to 0.1%
Differential Gain Error: 0.07%, (RL = 1k)
Differential Phase Error: 0.02°, (RL = 1k)
High Open-Loop Gain: 20V/mV Min
Single Supply 5V Operation
Output Shutdown
Because the LT1191 is a true operational amplifier, it is an
ideal choice for wideband signal conditioning, fast integrators, active filters, and applications requiring speed,
accuracy and low cost.
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APPLICATIO S
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The LT1191 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.
Video Cable Drivers
Video Signal Processing
Fast Integrators
Pulse Amplifiers
D/A Current to Voltage Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Video MUX Cable Driver
5V
7
3
VIN1
+
2
–
CMOS IN
CH. SELECT
6
LT1191
SHDN
Inverter Pulse Response
5
4
1k
–5V
1k
1k
74HC04
75Ω CABLE
74HC04
75Ω
1k
–5V
5V
VIN2
3
5
+ SHDN
7
6
LT1191
2
1k
–
1k
LT1190 • TA02
4
AV = –1, CL = 10pF SCOPE PROBE
–5V
LT1191 • TA01
1
LT1191
W W
W
AXI U
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ABSOLUTE
RATI GS
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PACKAGE/ORDER I FOR ATIO
(Note 1)
Total Supply Voltage (V + to V –) ............................. 18V
Differential Input Voltage ........................................ ±6V
Input Voltage .......................................................... ± VS
Output Short-Circuit Duration (Note 2) ........ Continuous
Operating Temperature Range
LT1191M (OBSOLETE) ............. –55°C to 125°C
LT1191C ............................................... 0°C to 70°C
Maximum Junction Temperature ......................... 150°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
TOP VIEW
BAL 1
8
BAL
–IN 2
7
V+
+IN 3
6
OUT
V– 4
5
SHDN
N8 PACKAGE
8-LEAD PDIP
LT1191CN8
LT1191CS8
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
1191
TJMAX = 150°C, θJA = 100°C/W (N8)
TJMAX = 150°C, θJA = 150°C/W (S8)
LT1191MJ8
LT1191CJ8
J8 PACKAGE 8-LEAD CERDIP
TJMAX = 150°C, θJA = 100°C/W
OBSOLETE PACKAGE
Consider the N8 or S8 Packages for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
ELECTRICAL CHARACTERISTICS
VS = ±5V, TA = 25°C, CL ≤ 10pF, Pin 5 open circuit unless otherwise noted.
MIN
LT1191M/C
TYP
MAX
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8 Package
SO-8 Package
IOS
Input Offset Current
0.2
1.7
µA
IB
Input Bias Current
±0.5
±2.5
µA
en
Input Noise Voltage
in
Input Noise Current
RIN
Input Resistance
CIN
Input Capacitance
AV = +1
Input Voltage Range
(Note 3)
CMRR
Common Mode Rejection Ratio
VCM = – 2.5V to 3.5V
60
75
dB
PSRR
Power Supply Rejection Ratio
VS = ±2.375V to ±8V
60
75
dB
AVOL
Large-Signal Voltage Gain
RL = 1k, VO = ±3V
RL = 100Ω, VO = ±3V
VS = ±8V, RL = 100Ω, VO = ±5V
20
4
6
45
9
12
V/mV
V/mV
V/mV
VOUT
Output Voltage Swing
VS = ±5V, RL = 1k
VS = ±8V, RL = 1k
±3.7
±6.7
±4
±7
V
V
SR
Slew Rate
AV = –2, RL = 1k (Notes 4, 9)
325
450
V/µs
FPBW
Full-Power Bandwidth
VO = 6VP-P (Note 5)
17.2
23.9
MHz
GBW
Gain Bandwidth Product
tr1, t f1
Rise Time, Fall Time
AV = 50, VO = ±1.5V, 20% to 80% (Note 9)
100
130
tr2, t f2
Rise Time, Fall Time
AV = 1, VO = ±125mV, 10% to 90%
1.25
ns
tPD
Propagation Delay
AV = 1, VO = ±125mV, 50% to 50%
2.2
ns
Overshoot
AV = 1, VO = ±125mV
25
%
Settling Time
3V Step, 0.1% (Note 6)
110
ns
1
fO = 10kHz
fO = 10kHz
Differential Mode
Common Mode
ts
2
5
9
UNITS
mV
mV
25
nV/√Hz
4
pA/√Hz
70
kΩ
5
MΩ
2
pF
–2.5
3.5
90
V
MHz
160
ns
LT1191
ELECTRICAL CHARACTERISTICS
VS = ±5V, TA = 25°C, CL ≤ 10pF, Pin 5 open circuit unless otherwise noted.
MIN
LT1191M/C
TYP
MAX
SYMBOL
PARAMETER
CONDITIONS
Diff AV
Differential Gain
RL = 150Ω, AV = 2 (Note 7)
0.15
Diff Ph
Differential Phase
RL = 150Ω, AV = 2 (Note 7)
0.09
IS
Supply Current
32
UNITS
%
DegP-P
38
mA
Shutdown Supply Current
Pin 5 at
V–
1.3
2
mA
Shutdown Pin Current
Pin 5 at V –
20
50
µA
tON
Turn On Time
100
ns
tOFF
Turn Off Time
Pin 5 from V – to Ground, RL = 1k
Pin 5 from Ground to V –, RL = 1k
400
ns
ISHDN
VS+ = 5V, VS– = 0V, VCM = 2.5V, TA = 25°C, CL ≤ 10pF, Pin 5 open circuit unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8 Package
SO-8 Package
IOS
Input Offset Current
IB
Input Bias Current
Input Voltage Range
MIN
LT1191M/C
TYP
MAX
2
(Note 3)
2
UNITS
7
9
mV
mV
0.2
1.2
µA
±0.5
±1.5
µA
3.5
V
CMRR
Common Mode Rejection Ratio
VCM = 2V to 3.5V
55
70
dB
AVOL
Large-Signal Voltage Gain
RL = 100Ω to Ground, VO = 1V to 3V
5
9
V/mV
VOUT
Output Voltage Swing
RL = 100Ω to Ground
3.6
3.8
SR
Slew Rate
AV = –1, VO = 1V to 3V
GBW
Gain Bandwidth Product
IS
Supply Current
VOUT High
VOUT Low
Shutdown Supply Current
ISHDN
Shutdown Pin Current
0.25
V
0.4
V
250
V/µs
80
MHz
29
36
mA
Pin 5 at V –
1.2
2
mA
V–
20
50
µA
Pin 5 at
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.
LT1191M
TYP
MAX
●
2
8
Input VOS Drift
●
8
IOS
Input Offset Current
●
0.2
2
µA
IB
Input Bias Current
●
±0.5
±2.5
µA
CMRR
Common Mode Rejection Ratio
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8 Package
∆VOS /∆T
MIN
VCM = – 2.5V to 3.5V
●
55
UNITS
mV
µV/°C
70
dB
PSRR
Power Supply Rejection Ratio
VS = ±2.375V to ±5V
●
55
70
dB
AVOL
Large-Signal Voltage Gain
RL = 1k, VO = ±3V
RL = 100, VO = ±3V
●
●
16
2
32
5
V/mV
V/mV
VOUT
Output Voltage Swing
RL = 1k
●
±3.7
±3.9
IS
Supply Current
Shutdown Supply Current
ISHDN
Shutdown Pin Current
V
●
32
38
mA
Pin 5 at V – (Note 8)
●
1.5
2.5
mA
V–
●
20
Pin 5 at
µA
3
LT1191
ELECTRICAL CHARACTERISTICS
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.
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8 Package
SO-8 Package
∆VOS /∆T
Input VOS Drift
●
8
IOS
Input Offset Current
●
0.2
1.7
µA
IB
Input Bias Current
●
±0.5
±2.5
µA
CMRR
Common Mode Rejection Ratio
VCM = – 2.5V to 3.5V
●
58
70
dB
PSRR
Power Supply Rejection Ratio
VS = ± 2.375V to ± 5V
●
58
70
dB
AVOL
Large-Signal Voltage Gain
RL = 1k, VO = ± 3V
RL = 100, VO = ±3V
●
●
20
3
40
9
V/mV
V/mV
VOUT
Output Voltage Swing
RL = 1k
●
±3.7
±3.9
IS
Supply Current
ISHDN
V–
Shutdown Supply Current
Pin 5 at
Shutdown Pin Current
Pin 5 at V –
MIN
LT1191C
TYP
SYMBOL
(Note 8)
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 ±1.5V
input step.
Note 5: Full-power bandwidth is calculated from the slew rate
measurement:
FPBW = SR/2πVP.
5V
7
+
6
LT1191
2
–
1
4
8
–5V
INPUT OFFSET VOLTAGE CAN BE ADJUSTED OVER A ±100mV
RANGE WITH A 1kΩ TO 10kΩ POTENTIOMETER
LT1191 • TA03
4
MAX
6
10
UNITS
mV
mV
µV/°C
V
●
32
38
mA
●
1.4
2.1
mA
●
20
µA
Note 6: Settling time measurement techniques are shown in “Take the
Guesswork Out of Settling Time Measurements,” EDN, September 19,
1985. AV = –1, RL = 1k.
Note 7: NTSC (3.58MHz). For RL = 1k, Diff AV = 0.07%, Diff Ph = 0.02°.
Note 8: See Applications section for shutdown at elevated temperatures.
Do not operate the shutdown above TJ > 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).
Optional Offset Nulling Circuit
3
2
●
LT1191
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TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current
vs Common Mode Voltage
–0.3
VS = ±5V
INPUT BIAS CURRENT (µA)
INPUT BIAS CURRENT (µA)
3
2
1
25°C
0
Common Mode Voltage
vs Supply Voltage
–55°C
125°C
–1
10
VS = ±5V
–0.4
+IB
–0.5
IOS
–0.6
–IB
–0.7
–55°C
25°C
8
COMMON MODE VOLTAGE (V)
4
Input Bias Current
vs Temperature
6
+V COMMON MODE
125°C
4
2
0
–2
–55°C
25°C
125°C
–4
–V COMMON MODE
–6
–8
–2
–3
1
3
–2 –1
0
2
COMMON MODE VOLTAGE (V)
–0.8
–50
4
–10
–25
50
0
25
75
TEMPERATURE (°C)
LT1191 • TPC01
150
100
50
0
100
10
1k
10k
FREQUENCY (Hz)
80
VS = ±5V
TA = 25°C
RS = 100k
40
20
0
100
1k
10k
FREQUENCY (Hz)
4.5
OPEN-LOOP VOLTAGE GAIN (V/V)
SHUTDOWN SUPPLY CURRENT (mA)
125°C
10
0
100k
VSHDN = –VEE + 0.4V
4.0
3.5
3.0 VSHDN = –VEE + 0.2V
2.5
2.0
VSHDN = –VEE
1.5
100
125
LT1191 • TPC07
2
8
4
6
±SUPPLY VOLTAGE (V)
Open-Loop Voltage Gain
vs Load Resistance
50k
RL = 1k
40k
30k
20k
10k
0
–50
RL = 100Ω
VS = ±5V
VO = ±3V
–25
50
0
25
75
TEMPERATURE (°C)
10
LT1191 • TPC06
50k
0
25
75
50
TEMPERATURE (°C)
25°C
20
Open-Loop Voltage Gain
vs Temperature
VS = ±5V
–25
–55°C
LT1191 • TPC05
Shutdown Supply Current
vs Temperature
1.0
–50
30
0
10
LT1191 • TPC04
5.0
Supply Current vs Supply Voltage
60
100k
10
40
SUPPLY CURRENT (mA)
200
EQUIVALENT INPUT NOISE CURRENT (pA/√Hz)
EQUIVALENT INPUT NOISE VOLTAGE (nV/ √Hz)
250
6
4
8
±V SUPPLY VOLTAGE (V)
LT1191 • TPC03
Equivalent Input Noise Current
vs Frequency
VS = ±5V
TA = 25°C
RS = 0Ω
2
0
125
LT1191 • TPC02
Equivalent Input Noise Voltage
vs Frequency
300
100
OPEN-LOOP VOLTAGE GAIN (V/V)
–4
100
125
LT1191 • TPC08
40k
VS = ±5V
VO = ±3V
TA = 25°C
30k
20k
10k
0
10
100
LOAD RESISTANCE (Ω)
1000
LT1191 • TPC09
5
LT1191
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TYPICAL PERFOR A CE CHARACTERISTICS
Gain Bandwidth Product
vs Supply Voltage
Gain, Phase vs Frequency
60
40
40
20
20
GAIN
0
0
1M
–20
1G
10M
100M
FREQUENCY (Hz)
TA = –55°C, 25°C, 125°C
75
65
55
2
4
8
6
±V SUPPLY VOLTAGE (V)
LT1191 • TPC10
UNITY GAIN FREQUENCY
90
42
40
80
38
36
25
75
0
50
TEMPERATURE (°C)
100
COMMON MODE REJECTION RATIO (dB)
46
PHASE MARGIN (DEGREES)
UNITY GAIN FREQUENCY (MHz)
48
44
70
–50 –25
70
50
PHASE MARGIN
60
10k
1k
40
30
20
10
100k
34
125
80
60
10M
100M
FREQUENCY (Hz)
80
–PSRR
+PSRR
20
0
–20
1k
1G
5
+VOUT, 25°C,
125°C, –55°C
4
2
0
–2
–VOUT, –55°C,
25°C,125°C
–4
125
LT1191 • TPC16
6
10M
100M
VS = ±5V
TA = –55°C
3
TA = 25°C
1
TA = 125°C
–1
TA = 125°C
–3
–8
TA = –55°C, 25°C
–10
100
1M
100k
FREQUENCY (Hz)
Output Voltage Swing
vs Load Resistance
–6
50
0
25
75
TEMPERATURE (°C)
10k
LT1191 • TPC15
RL = 1k
8
OUTPUT SWING (V)
90
VS = ±5V
VRIPPLE = ±300mV
TA = 25°C
40
Output Swing vs Supply Voltage
10
100M
LT1191 • TPC13
LT1191 • TPC14
VS = ±5V
–25
10M
–40
1M
6
70
–50
100k
1M
FREQUENCY (Hz)
Power Supply Rejection Ratio
vs Frequency
50
Output Short-Circuit Current
vs Temperature
OUTPUT SHORT-CIRCUIT CURRENT (mA)
AV = –10
0.1
10
VS = ±5V
TA = 25°C
RL = 1k
LT1191 • TPC12
100
AV = –1
AV = –100
Common Mode Rejection Ratio
vs Frequency
VS = ±5V
RL = 1k
100
1
LT1191 • TPC11
Unity Gain Frequency and
Phase Margin vs Temperature
110
VS = ±5V
TA = 25°C
10
0.01
0
POWER SUPPLY REJECTION RATIO (dB)
–20
100k
85
OUTPUT IMPEDANCE (Ω )
60
OUTPUT VOLTAGE SWING (V)
VOLTAGE GAIN (dB)
PHASE
100
95
PHASE MARGIN (DEGREES)
80
100
VS = ±5V
TA = 25°C
RL = 1k
80
GAIN BANDWIDTH PRODUCT (MHz)
100
Output Impedance
vs Frequency
–5
0
2
8
4
6
±V SUPPLY VOLTAGE (V)
10
LT1191 • TPC17
10
100
LOAD RESISTANCE (Ω)
1000
LT1191 • TPC18
LT1191
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TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage Step
vs Settling Time, AV = –1
VS = ±5V
TA = 25°C
RL = 1k
VO = ±2V
4
–SLEW RATE
OUTPUT VOLTAGE STEP (V)
SLEW RATE (V/µs)
600
500
+SLEW RATE
400
300
–50
4
VS = ±5V
TA = 25°C
RL = 1k
2
Output Voltage Step
vs Settling Time, AV = 1
1mV
OUTPUT VOLTAGE STEP (V)
Slew Rate vs Temperature
10mV
0
10mV
1mV
–2
–4
–25
0
25
50
75
TEMPERATURE (°C)
100
125
LT1191 • TPC19
Large-Signal Transient Response
LT1191 • TPC22
AV = 1, CL = 10pF SCOPE PROBE
10mV
2
1mV
0
10mV
1mV
–2
VS = ±5V
TA = 25°C
RL = 1k
–4
20
40
60
80 100 120
SETTLING TIME (ns)
140
160
50
70
90 110 130 150 170 190 210 230
SETTLING TIME (ns)
LT1191 • TPC20
Small-Signal Transient Response
LT1191 • TPC21
Output Overload
LT1191 • TPC23
AV = 1, SMALL-SIGNAL RISE TIME,
WITH FET PROBES
LT1191 • TPC24
AV = – 1, VIN = 12VP-P
7
LT1191
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APPLICATIO S I FOR ATIO
Power Supply Bypassing
The LT1191 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 tolerance, RL = 1kΩ.
No Supply Bypass Capacitors
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 amplified to1mV/DIV the settling time to 2mV is 2.61µs for the
0.1µF bypass; the time drops to 143ns with multiple
bypass capacitors.
Settling Time Poor Bypass
VOUT
1V/DIV
0V
0V
VOUT
1mV/DIV
0V
VOUT
1mV/DIV
LT1191 • TA04
AV = –1, IN DEMO BOARD, RL = 1kΩ
Supply bypassing can also affect the response in the
frequency domain. It is possible to see a slight 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.
LT1191 • TA06
SETTLING TIME TO 2mV, AV = –1
SUPPLY BYPASS CAPACITORS = 0.1µF
Settling Time Good Bypass
Closed-Loop Voltage Gain vs Frequency
CLOSED-LOOP VOLTAGE GAIN (dB)
20
VS = ±5V
TA = 25°C
RL = 1k
10
AV = 2
VOUT
1V/DIV
AV = 1
0
–10
–20
100k
1M
10M
100M
FREQUENCY (Hz)
1G
LT1191 • TA05
8
0V
LT1191 • TA07
SETTLING TIME TO 2mV, AV = –1
SUPPLY BYPASS CAPACITORS = 0.1µF + 4.7µF TANTALUM
LT1191
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APPLICATIO S I FOR ATIO
Cable Terminations
Using the Shutdown Feature
The LT1191 operational amplifier has been optimized as a
low cost video cable driver. The ±50mA guaranteed output
current enables the LT1191 to easily deliver 7.5VP-P into
100Ω, while operating on ±5V supplies or 2.6VP-P on a
single 5V supply.
The LT1191 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 15kΩ in parallel with the feedback resistors. The amplifiers must be used in a noninverting configuration for MUX applications. In inverting configurations
the input signal is fed to the output through the feedback
components. The following scope photos show that with
very high RL, the output is truly high impedance; the
output slowly decays toward ground. Additionally, when
the output is loaded with as little as 1kΩ the amplifier shuts
off in 400ns. This shutoff can be under the control of HC
CMOS operating between 0V and –5V.
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 (75Ω to ground) to absorb unwanted energy. The best performance can be obtained by double
termination (75Ω in series with the output of the amplifier,
and 75Ω to ground at the other end of the cable). This
termination is preferred because reflected energy is absorbed 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 compensated for by taking a gain of 2, or 6dB in the amplifier. The
cable driver has a –3dB bandwidth of 100MHz while
driving the 150Ω load. Note the response can be improved
by lowering the impedance of the feedback elements.
Output Shutdown
VSHDN
0V
– 5V
VOUT
Double Terminated Cable Driver
RG
5V
3+
7
6
LT1191
2–
4
–5V
75Ω
CABLE
75Ω
RFB
LT1191 • TA09
1MHz SINE WAVE GATED OFF WITH
SHUTDOWN PIN, AV = 1, RL = ∞
Cable Driver Voltage Gain vs Frequency
CLOSED-LOOP VOLTAGE GAIN (dB)
10
Output Shutdown
VS = ±5V
TA = 25°C
AV = 2
RFB = 1k
RG = 330Ω
0V
5
0
VSHDN
AV = 1
– 5V
R FB = 1k
RG = 1k
VOUT
RFB = 300Ω
RG = 300 Ω
–5
–10
100k
1M
10M
FREQUENCY (Hz)
100M
LT1191 • TA10
LT1191 • TA08
1MHz SINE WAVE GATED OFF WITH
SHUTDOWN PIN, AV = 1, RL = 1kΩ
9
LT1191
W
U
U
UO
APPLICATI
S I FOR ATIO
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 SHDN
pin close to the negative supply to keep the supply current
from increasing.
Other precautions include:
Murphy Circuits
3. PC board socket may reduce stability.
There are several precautions the user should take when
using the LT1191 in order to realize its full capability.
Although the LT1191 can drive a 30pF load, isolating the
capacitance with 10Ω can be helpful. Precautions primarily have to do with driving large capacitive loads.
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 RFB = 300Ω and
RG = 300Ω.)
Driving Capacitive Load
Driving Capacitive Load
1. Use a ground plane (see Design Note 50, High Frequency Amplifier Evaluation Board).
2. Do not use high source impedances. The input
capacitance of 2pF and RS = 10k, for instance, will give
an 8MHz – 3dB bandwidth.
LT1191 • TA11
LT1191 • TA12
AV = –1, IN DEMO BOARD, CL = 30pF
AV = –1, IN DEMO BOARD, CL = 30pF
WITH 10Ω ISOLATING RESISTOR
Murphy Circuits
5V
5V
3
+
6
LT1191
2
–
3
7
COAX
LT1191
2
4
–5V
+
–
5V
3
7
6
7
LT1191
2
4
–5V
+
–
1X SCOPE
PROBE
6
4
–5V
SCOPE
PROBE
LT1191 • TA13
An Unterminated Cable Is
a Large Capacitive Load
10
A 1X Scope Probe Is a
Large Capacitive Load
A Scope Probe on the Inverting
Input Reduces Phase Margin
LT1191
W
W
SI PLIFIED SCHE ATIC
7 V+
VBIAS
VBIAS
CM
+
3
–
2
CFF
+V
6 VOUT
+V
*
4 V–
LT1191 • TA14
5
1
8
SHDN
BAL
BAL
*SUBSTRATE DIODE, DO NOT FORWARD BIAS
U
PACKAGE DESCRIPTIO
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
CORNER LEADS OPTION
(4 PLCS)
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
0.300 BSC
(0.762 BSC)
0.200
(5.080)
MAX
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
0.015 – 0.060
(0.381 – 1.524)
0.008 – 0.018
(0.203 – 0.457)
0.005
(0.127)
MIN
0.405
(10.287)
MAX
8
7
6
5
0.025
(0.635)
RAD TYP
0.220 – 0.310
(5.588 – 7.874)
0° – 15°
1
0.045 – 0.065
(1.143 – 1.651)
0.014 – 0.026
(0.360 – 0.660)
0.100
(2.54)
BSC
2
3
4
J8 1298
0.125
3.175
MIN
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
OBSOLETE PACKAGE
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT1191
U
PACKAGE DESCRIPTIO
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
0.045 – 0.065
(1.143 – 1.651)
+0.889
–0.381
0.130 ± 0.005
(3.302 ± 0.127)
0.065
(1.651)
TYP
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
+0.035
0.325 –0.015
8.255
0.400*
(10.160)
MAX
)
0.125
(3.175) 0.020
MIN (0.508)
MIN
0.018 ± 0.003
0.100
(2.54)
BSC
N8 1098
(0.457 ± 0.076)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.014 – 0.019
(0.355 – 0.483)
TYP
*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
8
7
6
5
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
SO8 1298
1
2
3
4
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1363
High Speed Operational Amplifier
70MHz Gain Bandwidth, 1000V/µs Slew Rate, IS = 7.5mA Max
LT1813
High Speed Operational Amplifier
100MHz Gain Bandwidth, 750V/µs Slew Rate, IS = 3.6mA Max
12
Linear Technology Corporation
1191fa LT/CP 0801 1.5K REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1991
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湘ICP备2023018690号
