LT1193IS8#TR [Linear]
LT1193 - Video Difference Amplifier; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;
| 型号： | LT1193IS8#TR |
| 厂家： | 
Linear |
| 描述： | LT1193 - Video Difference Amplifier; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C 放大器 光电二极管 |
| 文件： | 总12页 (文件大小：429K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1193
Video Difference
Amplifier
U
FEATURES
DESCRIPTIO
The LT®1193 is a video difference amplifier optimized for
operation on ±5V and a single 5V supply. This versatile
amplifier features uncommitted high input impedance (+)
and (–) inputs, and can be used in differential or single-
ended configurations. Additionally, a second set of inputs
give gain adjustment and DC control to the differential
amplifier.
■
Differential or Single-Ended Gain Block (Adjustable)
■
–3dB Bandwidth, AV = ±2: 80MHz
■
Slew Rate: 500V/µs
Low Cost
■
■
Output Current: ±50mA
■
Settling Time: 180ns to 0.1%
■
CMRR at 10MHz: > 40dB
■
Differential Gain Error: 0.2%
The LT1193’s high slew rate, 500V/µs, wide bandwidth,
80MHz, and ±50mA output current make it ideal for
driving cables directly. The shutdown feature reduces the
power dissipation to a mere 15mW and allows multiple
amplifiers to drive the same cable.
■
Differential Phase Error: 0.08°
■
Single 5V Operation
Drives Cables Directly
■
■
Output Shutdown
U
The LT1193 is available in 8-pin PDIP and SO packages.
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Line Receivers
■
Video Signal Processing
■
Cable Drivers
Oscillators
■
■
Tape and Disc Drive Systems
U
TYPICAL APPLICATIO
Cable Sense Amplifier for Loop Through Connections with DC Adjust
V
IN
5V
3
2
+
–
7
CABLE
75Ω
6
LT1193
V
OUT
1
8
+
–
V
DC
75Ω
4
–5V
300Ω
LT1193 • TA01
300Ω
1193fb
1
LT1193
W W U W
U W
U
ABSOLUTE AXI U RATI GS
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
LT1193M (OBSOLETE) ................– 55°C to 125°C
LT1193C.................................................. 0°C to 70°C
LT1193I ...............................................–40°C to 85°C
Maximum Temperature ........................................ 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
TOP VIEW
NUMBER
+/REF
–IN
1
2
3
4
8
7
6
5
–/FB
+
LT1193CN8
LT1193CS8
LT1193IS8
V
+IN
OUT
–
V
SHDN
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
S8 PART MARKING
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 100°C/W (N8)
TJMAX = 150°C, θJA = 150°C/W (S8)
1193
1193I
J8 PACKAGE 8-LEAD CERDIP
JMAX = 150°C, θJA = 100°C/W
LT1193MJ8
LT1193CJ8
T
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, VREF = 0V, RFB1 = 900Ω from Pins 6 to 8, RFB2 = 100Ω from Pin 8
to ground, RL = RFB1 + RFB2 = 1k (Note 3), TA = 25°C, CL ≤ 10pF, Pin 5 open circuit, unless otherwise noted.
LT1193M/C/I
TYP
SYMBOL
PARAMETER
CONDITIONS
MIN
MAX
12
UNITS
mV
V
Input Offset Voltage
Input Offset Current
Input Bias Current
Both Inputs (Note 4) All Packages
Either Input
2
0.2
±0.5
50
OS
I
I
3
µA
OS
Either Input
±3.5
µA
B
e
Input Noise Voltage
Input Noise Current
Input Resistance
f = 10kHz
O
nV/√Hz
pA/√Hz
kΩ
n
i
f = 10kHz
O
4
n
R
Either Input
Either Input
(Note 5)
100
2
IN
C
V
Input Capacitance
pF
IN
Input Voltage Limit
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
1.3
V
IN(LIM)
–2.5
60
3.5
V
CMRR
PSRR
V
= – 2.5V to 3.5V
75
75
dB
CM
V = ±2.375V to ±8V
S
60
dB
V
V = ±5V, R = 1k
±3.8
±6.8
6.4
±4
±7
6.6
V
V
V
OUT
S
L
V = ±8V, R = 1k
S
L
V = ±8V, R = 100Ω
S
L
G
Gain Error
V = ±3V, R = 1k
L
0.1
0.1
1.0
1.2
%
%
E
O
L
R = 100Ω
SR
Slew Rate
V = ±2V, R = 300Ω (Notes 6, 11)
350
500
26.5
9
V/µs
MHz
MHz
ns
O
L
FPBW
BW
Full-Power Bandwidth
Small-Signal Bandwidth
Rise Time, Fall Time
Propagation Delay
Overshoot
V = 6V (Note 7)
18.5
O
P-P
t , t
r
A = 50, V = ±1.5V, 20% to 80% (Note 11)
110
160
15
210
f
V
O
t
t
R = 1k, V = ±125mV, 50% to 50%
ns
PD
L
O
V = ±50mV
O
0
%
Settling Time
3V Step, 0.1% (Note 8)
180
0.2
0.08
ns
s
Diff A
Differential Gain
Differential Phase
R = 150Ω, A = 2 (Note 9)
%
V
L
V
Diff Ph
R = 150Ω, A = 2 (Note 9)
Deg
P-P
1193fb
L
V
2
LT1193
ELECTRICAL CHARACTERISTICS
VS = ±5V, VREF = 0V, RFB1 = 900Ω from Pins 6 to 8, RFB2 = 100Ω from Pin 8
to ground, RL = RFB1 + RFB2 = 1k (Note 3), TA = 25°C, CL ≤ 10pF, Pin 5 open circuit, unless otherwise noted.
LT1193M/C/I
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
43
2
UNITS
mA
mA
µA
I
Supply Current
35
S
–
Shutdown Supply Current
Shutdown Pin Current
Turn On Time
Pin 5 at V
1.3
20
–
I
t
t
Pin 5 at V
50
SHDN
ON
–
Pin 5 from V to Ground, R = 1k
300
200
ns
L
–
Turn Off Time
Pin 5 from Ground to V , R = 1k
ns
OFF
L
VS+ = 5V, VS – = 0V, VREF = 2.5V, RFB1 = 900Ω from Pins 6 to 8, RFB2 = 100Ω from Pin 8 to VREF, RL = RFB1 + RFB2 = 1k (Note 3),
TA = 25°C, CL ≤ 10pF, Pin 5 open circuit, unless otherwise noted.
LT1193M/C/I
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
15
UNITS
mV
µA
V
Input Offset Voltage
Both Inputs (Note 4) All Packages
Either Input
3
OS
I
I
Input Offset Current
Input Bias Current
0.2
±0.5
3
OS
Either Input
±3.5
3.5
µA
B
Input Voltage Range
Common Mode Rejection Ratio
Output Voltage Swing
2
V
CMRR
V
= 2V to 3.5V
55
3.6
70
3.8
0.25
250
8
dB
CM
V
R = 100Ωto Ground
L
V
OUT
High
Low
V
OUT
V
0.4
V
OUT
SR
Slew Rate
V = 1V to 3V
O
V/µs
MHz
mA
mA
µA
BW
Small-Signal Bandwidth
Supply Current
I
I
32
40
2
S
–
Shutdown Supply Current
Shutdown Pin Current
Pin 5 at V
1.3
20
–
Pin 5 at V
50
SHDN
The ● denotes the specificatons which apply over the full operating temperature range of –55°C ≤ TA ≤ 125°C. VS = ±5V,
VREF = 0V, RFB1 = 900Ω from Pins 6 to 8, RFB2 = 100Ω from Pin 8 to ground, RL = RFB2 = 1k (Note 3), CL ≤ 10pF, Pin 5 open circuit,
unless otherwise noted.
LT1193M
TYP
SYMBOL PARAMETER
Input Offset Voltage
CONDITIONS
MIN
MAX
UNITS
mV
µV/°C
µA
V
●
●
●
●
●
●
●
●
●
●
●
●
●
2
16
OS
∆V /∆T Input V Drift
20
0.8
±1
OS
OS
I
I
Input Offset Current
5
OS
Input Bias Current
±5.5
3.5
µA
B
Input Voltage Range
–2.5
53
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
V
= – 2.5V to 3.5V
70
70
4
dB
CM
V = ±2.375V to ±5V
S
53
dB
V
R = 1k
L
3.6
6
V
OUT
V = ±8V, R = 100Ω
6.5
0.2
35
1.3
20
S
L
G
E
Gain Error
V = ±3V, R = 1k
1.2
43
%
mA
mA
µA
O
L
I
Supply Current
S
–
Shutdown Supply Current
Shutdown Pin Current
Pin 5 at V (Note 10)
2.2
–
I
Pin 5 at V
SHDN
1193fb
3
LT1193
ELECTRICAL CHARACTERISTICS
The ● denotes the specificatons which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C. VS = ±5V,
VREF = 0V, RFB1 = 900Ω from Pins 6 to 8, RFB2 = 100Ω from Pin 8 to ground, RL = RFB2 = 1k (Note 3), CL ≤ 10pF, Pin 5 open circuit,
unless otherwise noted.
LT1193I
TYP
2
SYMBOL PARAMETER
Input Offset Voltage
CONDITIONS
MIN
MAX
UNITS
mV
µV/°C
µA
V
OS
SO-8 Package
●
●
●
●
●
●
●
●
●
●
●
●
●
20
∆V /∆T Input V Drift
20
0.8
±1
OS
OS
I
I
Input Offset Current
5
OS
Input Bias Current
±5.5
3.5
µA
B
Input Voltage Range
–2.5
53
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
V
CM
= – 2.5V to 3.5V
70
70
4
dB
V = ±2.375V to ±5V
S
53
dB
V
OUT
R = 1k
L
3.6
6
V
V = ±8V, R = 100Ω
6.5
0.2
35
1.3
20
S
L
G
E
Gain Error
V = ±3V, R = 1k
1.2
43
%
mA
mA
µA
O
L
I
Supply Current
S
–
Shutdown Supply Current
Shutdown Pin Current
Pin 5 at V (Note 10)
2.2
–
I
Pin 5 at V
SHDN
The ● denotes the specificatons which apply over the full operating temperature range of 0°C ≤ TA ≤ 70°C. VS = ±5V, VREF = 0V,
RFB1 = 900Ω from Pins 6 to 8, RFB2 = 100Ω from Pin 8 to ground, RL = RFB1 + RFB2 = 1k (Note 3), CL ≤ 10pF, Pin 5 open circuit,
unless otherwise noted.
LT1193C
TYP
SYMBOL
PARAMETER
CONDITIONS
MIN
MAX
UNITS
V
Input Offset Voltage
N8 Package
SO-8 Package
●
●
2
14
20
mV
mV
OS
∆V /∆T
Input V Drift
●
●
●
●
●
●
20
0.2
µV/°C
µA
OS
OS
I
I
Input Offset Current
3.5
±4
OS
B
Input Bias Current
±0.5
µA
Input Voltage Range
–2.5
55
3.5
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
V
= – 2.5V to 3.5V
70
70
dB
CM
V = ±2.375V to ±5V
55
dB
S
V
R = 1k
R = 100Ω
●
●
3.7
6.2
4
6.6
V
V
OUT
L
L
G
Gain Error
V = ±3V, R = 1k
●
●
●
●
0.2
35
1.2
43
%
mA
mA
µA
E
O
L
I
Supply Current
S
–
Shutdown Supply Current
Shutdown Pin Current
Pin 5 at V (Note 10)
1.3
20
2.1
–
I
Pin 5 at V
SHDN
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 7: Full-power bandwidth is calculated from the slew rate
measurement:
FPBW = SR/2πV .
Note 2: A heat sink is required to keep the junction temperature below
P
absolute maximum when the output is shorted.
Note 8: Settling time measurement techniques are shown in “Take the
Guesswork Out of Settling Time Measurements,” EDN, September 19,
1985.
Note 3: When R = 1k is specified, the load resistor is R + R , but
L
FB1
FB2
when R = 100Ω is specified, then an additional 100Ω is added to the
L
output.
Note 9: NTSC (3.58MHz).
Note 4: V measured at the output (Pin 6) is the contribution from both
OS
Note 10: See Applications section for shutdown at elevated temperatures.
input pair, and is input referred.
Do not operate the shutdown above T > 125°C.
J
Note 5: V
is the maximum voltage between –V and +V (Pin 2 and
IN LIM
IN IN
Note 11: 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).
Pin 3) for which the output can respond.
Note 6: Slew rate is measured between ±2V on the output, with a ±1V
input step, A = 3.
V
1193fb
4
LT1193
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current
vs Common Mode Voltage
Input Bias Current
vs Temperature
Common Mode Voltage
vs Supply Voltage
4
3
–0.3
–0.4
10
8
V
S
= ±5V
V
S
= ±5V
–55°C
25°C
6
+V COMMON MODE
125°C
4
+I
B
2
1
–0.5
–0.6
–0.7
–0.8
2
I
OS
0
25°C
–2
–4
–6
–8
–10
–55°C
0
–1
–2
–55°C
25°C
–V COMMON MODE
–I
125°C
B
125°C
–4 –3 –2 –1
0
1
2
3
4
–50 –25
0
25
50
75 100 125
0
2
4
6
8
10
COMMON MODE VOLTAGE (V)
TEMPERATURE (°C)
±V SUPPLY VOLTAGE (V)
LT1193 • TPC01
LT1193 • TPC02
LT1193 • TPC03
Equivalent Input Noise Voltage
vs Frequency
Equivalent Input Noise Current
vs Frequency
Supply Current vs Supply Voltage
400
350
80
60
40
50
40
30
V
T
= ±5V
V
T
= ±5V
= 25°C
= 0Ω
S
S
= 25°C
A
A
R
= 100k
R
S
S
300
250
200
150
100
50
–55°C
25°C
125°C
20
10
0
20
0
0
10
100
1k
10k
100k
10
100
1k
10k
100k
0
2
4
6
8
10
FREQUENCY (Hz)
FREQUENCY (Hz)
±SUPPLY VOLTAGE (V)
LT1193 • TPC04
LT1193 • TPC05
LT1193 • TPC06
Shutdown Supply Current
vs Temperature
Gain Error vs Temperature
Open-Loop Gain vs Temperature
20k
15k
10k
5k
3
2
5.0
4.5
V
S
= ±5V
V
V
= ±5V
= ±3V
V
S
= ±5V
S
O
R
= 1k
L
V
= –V + 0.4V
EE
4.0
3.5
3.0
2.5
2.0
1.5
1.0
SHDN
R
= 100Ω
L
1
R
L
= 1k
V
= –V + 0.2V
EE
SHDN
0
–1
V
= –V
50
SHDN
EE
R
= 100Ω
L
0
–2
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
–50 –25
0
25
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1193 • TPC08
LT1193 • TPC09
LT1193 • TPC07
1193fb
5
LT1193
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Open-Loop Voltage Gain
vs Load Resistance
Gain Bandwidth Product
vs Supply Voltage
Gain, Phase vs Frequency
20k
15k
10k
5k
80
70
100
80
60
40
20
0
100
80
60
40
20
0
V
V
= ±5V
= ±3V
= 25°C
S
O
A
T
PHASE
GAIN
T
A
= –55°C, 25°C, 125°C
60
50
V
= ±5V
= 25°C
= 1k
S
A
L
T
R
–20
100k
–20
100M
0
10
100
1000
0
2
4
6
8
10
1M
10M
LOAD RESISTANCE (Ω)
±SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
LT1193 • TPC11
LT1193 • TPC10
LT1193 • TPC12
Gain Bandwidth Product and Unity
Gain Phase Margin vs Temperature
Common Mode Rejection Ratio
vs Frequency
Output Impedance vs Frequency
80
70
60
70
65
60
55
50
70
65
60
55
50
100
V
T
= ±5V
V
= ±5V
= 1k
S
V
T
= ±5V
= 25°C
S
L
S
A
= 25°C
R
A
R
= 1k
L
10
1
GAIN BANDWIDTH PRODUCT
A
V
= 10
A
= 2
V
0.1
0.01
50
40
30
UNITY GAIN
45
40
35
30
45
40
35
30
PHASE MARGIN
0.001
–50 –25
0
25
50
75 100 125
1k
10k
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
TEMPERATURE (°C)
FREQUENCY (Hz)
LT1193 • TPC15
LT1193 • TPC14
LT1193 • TPC13
Power Supply Rejection Ratio
vs Frequency
Output Short-Circuit Current
vs Temperature
Output Swing vs Supply Voltage
80
60
100
90
10
8
R
L
= 1k
V
= ±5V
V
= ±5V
S
A
S
°
T
= 25 C
= ±300mV
+V , 25°C,
OUT
V
RIPPLE
125°C, –55°C
6
4
+PSRR
–PSRR
40
2
0
20
–2
–4
80
–V , –55°C,
OUT
25°C, 125°C
0
–6
–8
–20
70
–10
–50 –25
0
25
50
75 100 125
0
2
4
6
8
10
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
TEMPERATURE (°C)
±V SUPPLY VOLTAGE (V)
LT1193 • TPC16
LT1193 • TPC17
LT1193 • TPC18
1193fb
6
LT1193
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage Swing
vs Load Resistance
Output Voltage Step
vs Settling Time, AV = 2
Slew Rate vs Temperature
5
3
4
2
900
800
700
600
500
400
300
V
= ±5V
V
= ±5V
= 25°C
= 1k
S
S
A
L
T
R
T
= –55°C
A
–SLEW RATE
10mV
T
= 25°C
A
1
T
= 125°C
A
0
–1
–3
–5
+SLEW RATE
–2
–4
V
T
= ±5V
= 25°C
= 1k
S
T
= 125°C
10mV
A
A
R
L
T
= –55°C, 25°C
A
V
O
= ±2V
10
100
LOAD RESISTANCE (Ω)
1000
–50 –25
0
25
50
75 100 125
40
50
60
70
80
90
100
TEMPERATURE (°C)
SETTLING TIME (ns)
LT1193 • TPC19
LT1193 • TPC20
LT1193 • TPC21
Large-Signal Transient Response
Small-Signal Transient Response
Small-Signal Transient Response
LT1193 • TPC23
LT1193 • TPC22
LT1193 • TPC24
AV = –10, SMALL-SIGNAL RISE TIME = 43ns
AV = 2, RL = 150Ω, RFB = 300Ω, RG = 300Ω
AV = 2, RFB = 300Ω, RG = 300Ω,
OVERSHOOT = 25%, RISE TIME = 4.7ns
W U U
U
APPLICATIO S I FOR ATIO
The LT1193 is a video difference amplifier which has two
uncommitted high input impedance (+) and (–) inputs.
The amplifier has one set of inputs that can be used for
reference and feedback. Additionally, this set of inputs
givegainadjustandDCcontroltothedifferentialamplifier.
The voltage gain of the LT1193 is set like a conventional
operational amplifier. Feedback is applied to Pin 8 and it is
optimized for gains of 2 or greater. The amplifier can be
operated single-ended by connecting either the (+) or (–)
inputs to +/REF, Pin 1. The voltage gain is set by the
resistors: (RFB + RG)/RG.
and a full-power bandwidth of 40MHz at 4VP-P. Like the
single-endedcase,thedifferentialvoltagegainissetbythe
external resistors: (RFB + RG)/RG. The maximum input
differential signal for which the output will respond is
approximately ±1.3V.
Power Supply Bypassing
The LT1193 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 by-
passing is used to demonstrate this bypassing tolerance,
RL = 1k.
The primary usefulness of the LT1193 is in converting
high speed differential signals to a single-ended output.
The amplifier has common mode rejection beyond 50MHz
1193fb
7
LT1193
W U U
U
APPLICATIO S I FOR ATIO
SHDN
SHDN
Settling Time Poor Bypass
+
+
V
V
5
+
5
+
3
2
3
2
7
7
V
IN
V
IN
–
–
6
6
LT1193
LT1193
V
OUT
V
OUT
1
8
1
8
+/REF
+/REF
–/FB
–/FB
4
4
–
–
V
R
V
R
VOUT
1V/DIV
VOUT
10mV/DIV
FB
FB
0V
0V
R
+ R
R
+ R
G
R
G
R
G
FB
G
FB
A
V
= +
A
= –
V
R
G
R
G
SHDN
SHDN
+
+
V
V
5
+
5
+
3
2
3
2
LT1192 • TA05
7
7
V
V
INDIFF
INDIFF
SETTLING TIME TO 10mV, AV = 2
SUPPLY BYPASS CAPACITORS = 0.1µF
–
–
6
6
LT1193
LT1193
V
OUT
V
OUT
1
8
1
8
+/REF
+/REF
V
IN
R
G
V
G
–/FB
–/FB
IN
4
4
–
Settling Time Good Bypass
–
V
V
R
R
FB
FB
R
+ R
FB
V
O
= (V
+ V )
INDIFF IN
R
+ R
R
FB
R
R
G
FB
R
G
V
O
=
V
(
–
V
IN
INDIFF
(
(
(
G
R
G
G
LT1193 • TA03
VOUT
1V/DIV
VOUT
10mV/DIV
0V
0V
No Supply Bypass Capacitors
LT1192 • TA06
SETTLING TIME TO 10mV, AV = 2
SUPPLY BYPASS CAPACITORS = 0.1µF + 4.7µF TANTALUM
Operating With Low Closed-Loop Gains
The LT1193 has been optimized for closed-loop gains of
2 or greater; the frequency response illustrates the ob-
tainable closed-loop bandwidths. For a closed-loop gain
of 2 the response peaks about 2dB. Peaking can be
minimized by keeping the feedback elements below 1kΩ,
and can be eliminated by placing a capacitor across the
feedback resistor, (feedback zero). This peaking shows
up as time domain overshoot of about 40%. With the
feedback capacitor it is eliminated.
LT1192 • TA04
AV = 10, IN DEMO BOARD, RL = 1k
In many 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
outputwaveformlooksacceptableat1V/DIV, whenampli-
fiedto10mV/DIVthesettlingtimeto10mVis347nsforthe
0.1µFbypass;thetimedropsto96nswithmultiplebypass
capacitors.
Cable Terminations
TheLT1193videodifferenceamplifierhasbeenoptimized
as a low cost cable driver. The ±50mA guaranteed output
current enables the LT1193 to easily deliver 7.5VP-P into
1193fb
8
LT1193
W U U
U
APPLICATIO S I FOR ATIO
Small-Signal Transient Response
Closed-Loop Voltage Gain vs Frequency
25
V
T
= ±5V
= 25°C
S
A
A
= 10
= 5
V
V
A
15
5
A
A
= 3
= 2
V
V
–5
100k
1M
10M
100M
LT1193 • TA10
FREQUENCY (Hz)
AV = 2 WITH 8pF FEEDBACK CAPACITOR
RISE TIME = 3.75ns, RFB = 1k, RG = 1k
LT1193 • TA07
Closed-Loop Voltage Gain vs Frequency
Double Terminated Cable Driver
10
5V
V
T
A
R
R
= ±5V
= 25°C
= 2
S
3
2
+
7
A
C
= 0pF
FB
CABLE
–
75Ω
6
V
8
6
LT1193
1
8
C
= 5pF
= 300Ω
FB
FB
+
–
= 300Ω
G
4
–5V
75Ω
R
C
= 10pF
C
R
G
FB
FB
= 15pF
FB
C
4
2
0
FB
Closed-Loop Voltage Gain vs Frequency
8
100k
1M
10M
100M
6
FREQUENCY (Hz)
A
= 2
V
LT1193 • TA08
R
= 300Ω
4
2
0
FB
G
R
= 100Ω
C
= 0pF
FB
Small-Signal Transient Response
A
= 1
V
R
C
= 300Ω
FB
G
–2
–4
–6
R
= 300Ω
= 10pF
FB
100k
1M
10M
100M
FREQUENCY (Hz)
LT1193 • TA11
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 en-
ergy. The best performance can be obtained by double
termination(75Ωinserieswiththeoutputoftheamplifier,
and 75Ω to ground at the other end of the cable). This
1193fb
LT1193 • TA09
AV = 2, OVERSHOOT = 40%, RFB = 1k, RG = 1k
100Ω, while operating on ±5V supplies and gains >3. On
a single 5V supply, the LT1193 can swing 2.6VP-P for
gains ≥2.
9
LT1193
W U U
U
APPLICATIO S I FOR ATIO
isolating the capacitance with 10Ω can be helpful. Precau-
tions primarily have to do with driving large
capacitive loads.
termination is preferred because reflected energy is ab-
sorbed at each end of the cable. When using the double
terminationtechniqueitisimportanttonotethatthesignal
is attenuated by a factor of 2, or 6dB. The cable driver has
a –3dB bandwidth of 80MHz while driving a 150Ω load.
Other precautions include:
1. Use a ground plane (see Design Note 50, High Fre-
quency Amplifier Evaluation Board).
Using the Shutdown Feature
The LT1193 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
shutdownbytakingPin5toV–.Inshutdown,theamplifier
dissipates15mWwhilemaintainingatruehighimpedance
output state of 15kΩ in parallel with the feedback resis-
tors. The amplifiers may be connected inverting, nonin-
verting or differential for MUX applications. When the
output is loaded with as little as 1kΩ from the amplifier’s
feedback resistors, the amplifier shuts off in 200ns. This
shutoff can be under the control of HC CMOS operating
between 0V and – 5V.
2. Do not use high source impedances. The input capaci-
tance of 2pF, and RS = 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 RFB = 300Ω and
RG = 300Ω.)
Driving Capacitive Load
Output Shutdown
tON = 300ns
tOFF = 200ns
LT1193 • TA14
AV = 2, IN DEMO BOARD, CL = 30pF, RFB = 1k, RG = 1k
LT1193 • TA12
Driving Capacitive Load
1MHz SINE WAVE GATED OFF WITH
SHUTDOWN PIN, AV = 3, RFB = 1k, RG = 500Ω
The ability to maintain shutoff is shown on the curve
Shutdown Supply Current vs Temperature in the Typical
Performance Characteristics section. At very high el-
evated temperatures it is important to hold the SHDN 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 LT1193 in order to realize its full capability.
AlthoughtheLT1193candrivea30pFingainsaslowas 2,
LT1193 • TA15
AV = 2, IN DEMO BOARD, CL = 30pF
WITH 10Ω ISOLATING RESISTOR
1193fb
10
LT1193
W U U
U
APPLICATIO S I FOR ATIO
Murphy Circuits
5V
5V
5V
3
2
3
+
–
+
3
2
7
7
+
–
2
7
COAX
–
6
6
LT1193
LT1193
1
6
1
8
LT1193
+
–
+
–
1
8
+
–
8
4
4
1X SCOPE
PROBE
4
–5V
–5V
–5V
SCOPE
PROBE
LT1193 • TA13
An Unterminated Cable Is
a Large Capacitive Load
A 1X Scope Probe Is a
Large Capacitive Load
A Scope Probe on the Inverting
Input Reduces Phase Margin
W
W
SI PLIFIED SCHE ATIC
+
V
7
V
BIAS
V
BIAS
C
M
+
3
C
FF
2
–
V
6
+V
+V
OUT
*
–
V
4
5
SHDN
1
+/REF
8
–/FB
* SUBSTRATE DIODE, DO NOT FORWARD BIAS
LT1193 • TA16
1193fb
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1193
U
PACKAGE DESCRIPTIO
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
.405
(10.287)
MAX
(Reference LTC DWG # 05-08-1110)
.005
(0.127)
MIN
.200
.300 BSC
CORNER LEADS OPTION
(5.080)
MAX
(7.62 BSC)
(4 PLCS)
6
5
4
8
7
.015 – .060
(0.381 – 1.524)
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
.025
(0.635)
RAD TYP
.220 – .310
(5.588 – 7.874)
.008 – .018
(0.203 – 0.457)
0° – 15°
.045 – .068
J8 0801
(1.143 – 1.650)
FULL LEAD
OPTION
1
2
3
.045 – .065
(1.143 – 1.651)
.125
3.175
MIN
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
.014 – .026
(0.360 – 0.660)
.100
(2.54)
BSC
OBSOLETE PACKAGE
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
.130 ± .005
.300 – .325
.045 – .065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
8
1
7
6
5
.065
(1.651)
TYP
.255 ± .015*
(6.477 ± 0.381)
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
–.015
2
4
3
.325
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
N8 1002
+0.889
8.255
(
)
–0.381
NOTE:
INCHES
MILLIMETERS
1. DIMENSIONS ARE
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.160 ±.005
.010 – .020
(0.254 – 0.508)
7
5
8
6
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.050 BSC
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.150 – .157
(3.810 – 3.988)
NOTE 3
.245
MIN
.228 – .244
(5.791 – 6.197)
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
.030 ±.005
TYP
1
2
3
4
RECOMMENDED SOLDER PAD LAYOUT
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
A = 10 Version of the LT1193
LT1194
Video Difference Amp
V
1193fb
LT/TP 0903 1K REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
LINEAR TECHNOLOGY CORPORATION 1991
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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