LT1194
Video Difference
Amplifier
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Differential or Single-Ended Gain Block:
±10
(20dB)
– 3dB Bandwidth: 35MHz
Slew Rate: 500V/µs
Low Cost
Output Current:
±50mA
Settling Time: 200ns to 0.1%
CMRR at 10MHz: 45dB
Differential Gain Error: 0.2%
Differential Phase Error: 0.08°
Input Amplitude Limiting
Single 5V Operation
Drives Cables Directly
The LT
®
1194 is a video difference amplifier optimized for
operation on
±5V
and a single 5V supply. The amplifier has
a fixed gain of 20dB and features adjustable input limiting
to control tough overdrive applications. It has uncommit-
ted high input impedance (+) and (–) inputs, and can be
used in differential or single-ended configurations.
The LT1194’s high slew rate 500V/µs, wide bandwidth
35MHz, and
±50mA
output current make it ideal for
driving cables directly. This versatile amplifier is easy to
use for video or applications requiring speed, accuracy
and low cost.
The LT1194 is available in 8-pin PDIP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
Line Receivers
Video Signal Processing
Gain Limiting
Oscillators
Tape and Disc Drive Systems
TYPICAL APPLICATIO
Wideband Differential Amplifier
with Limiting
250Ω
7pF TO 45pF
4
1
INPUT
14
11
NE592
7
–5V
1µF
1k
A
V
= 1000, –3dB BW = 35MHz
1k
5V
8
5V
3
2
5
Sine Wave Reduced by Limiting
1µF
+
–
+
1
7
LT1194
4
8
–5V
V
CONTROL
LT1194 • TA01
6
OUTPUT
V
OUT
1V/DIV
200kHz SINE WAVE WITH V
CONTROL
= –5V, –4V, –3V, –2V
U
LT1193 • TA02
U
U
1
LT1194
ABSOLUTE
(Note 1)
AXI U
RATI GS
TOP VIEW
BAL/V
C
1
–IN 2
+IN 3
V
–
4
N8 PACKAGE
8-LEAD PDIP
8
7
6
5
BAL/V
C
V
+
OUT
REF
Total Supply Voltage (V
+
to V
–
) .............................. 18V
Differential Input Voltage ........................................
±
6V
Input Voltage ..........................................................
±
V
S
Output Short Circuit Duration (Note 2) ........ Continuous
Operating Temperature Range
LT1194M
(OBSOLETE) ...............
– 55°C to 125°C
LT1194C ................................................. 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
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
I
OS
I
B
e
n
i
n
R
IN
C
IN
CMRR
PSRR
V
OMAX
V
LIM
V
OUT
PARAMETER
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Maximum Output Signal
Output Voltage Limit
Output Voltage Swing
V
S
=
±5V,
V
REF
= 0V, Null Pins 1 and 8 open circuit, T
A
= 25°C, C
L
≤
10pF, unless otherwise noted.
CONDITIONS
All Packages
MIN
LT1194M/C
TYP
1
0.2
±0.5
f
O
= 10kHz
f
O
= 10kHz
Either Input
Either Input
– 2.5
V
CM
= –2.5V to 3.5V
V
S
=
±2.375V
to
±8V
V
S
=
±8V
(Note 3)
V
i
=
±0.5V,
V
C
= 2V (Note 4)
V
S
=
±8V,
V
REF
= 4V
V
S
=
±8V,
V
REF
= –4V
V
S
=
±5V,
V
REF
= 0V, R
L
= 1k
G
E
SR
FPBW
BW
t
r
, t
f
t
PD
Gain Error
Slew Rate
Full-Power Bandwidth
Small-Signal Bandwidth
Rise Time, Fall Time
Propagation Delay
R
L
= 1k, V
O
=
±500mV,
20% to 80% (Note 9)
R
L
= 1k, V
O
=
±125mV,
50% to 50%
4
V
O
=
±3V
V
O
=
±
1V, R
L
= 1k (Notes 5, 9)
V
O
= 6V
P-P
(Note 6)
R
L
= 1k
R
L
= 100Ω
350
18.5
R
L
= 1k
R
L
= 100Ω
R
L
= 1k
R
L
= 100Ω
6.6
6.3
– 6.7
– 6.4
±3
65
65
±3
80
80
±4.3
±20
6.9
6.7
– 7.4
– 6.7
±4
0.5
0.5
500
26.5
35
6
6.5
8
3
3
±120
15
4
30
2
3.5
MAX
6
3
±3.5
UNITS
mV
µA
µA
nV/√Hz
pA/√Hz
kΩ
pF
V
dB
dB
V
mV
V
V
V
V
V
%
%
V/µs
MHz
MHz
ns
ns
2
U
W W
W
ORDER PART
NUMBER
LT1194CN8
LT1194CS8
S8 PART MARKING
1194
LT1194MJ8
LT1194CJ8
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)
J8 PACKAGE 8-LEAD CERDIP
T
JMAX
= 150°C,
θ
JA
= 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.
LT1194
ELECTRICAL CHARACTERISTICS
V
S
=
±5V,
V
REF
= 0V, Null Pins 1 and 8 open circuit, T
A
= 25°C, C
L
≤
10pF, unless otherwise noted.
SYMBOL
t
s
Diff A
V
Diff Ph
I
S
PARAMETER
Overshoot
Settling Time
Differential Gain
Differential Phase
Supply Current
CONDITIONS
V
O
=
±125mV
3V Step, 0.1% (Note 7)
R
L
= 150Ω (Note 8)
R
L
= 150Ω (Note 8)
MIN
LT1194M/C
TYP
MAX
0
200
0.2
0.08
35
43
UNITS
%
ns
%
Deg
P-P
mA
V
S
+
= 5V, V
S
–
= 0V, V
REF
= 2.5V, Null Pins 1 and 8 open circuit, T
A
= 25°C, C
L
≤
10pF, unless otherwise noted.
SYMBOL
V
OS
I
OS
I
B
CMRR
V
LIM
V
OUT
SR
BW
I
S
PARAMETER
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Voltage Range
Common Mode Rejection Ratio
Output Voltage Limit
Output Voltage Swing
Slew Rate
Small-Signal Bandwidth
Supply Current
V
CM
= 2V to 3.5V
V
I
=
±
0.5V, V
C
= 2V (Note 4)
R
L
= 100Ω to Ground
V
O
= 1V to 3V
V
OUT
High
V
OUT
Low
3.6
2
55
70
±20
3.8
0.25
250
32
32
40
0.4
±120
CONDITIONS
All Packages
MIN
LT1194M/C
TYP
MAX
2
0.2
±0.5
8
3
±3
3.5
UNITS
mV
µA
µA
V
dB
mV
V
V
V/µs
MHz
mA
The
q
denotes specifications which apply over the full operating temperature range of – 55°C
≤
T
A
≤
125°C.
V
S
=
±5V,
V
REF
= 0V, Null Pins 1 and 8 open circuit, unless otherwise noted.
SYMBOL
V
OS
∆V
OS
/∆T
I
OS
I
B
CMRR
PSRR
V
LIM
V
OUT
PARAMETER
Input Offset Voltage
Input V
OS
Drift
Input Offset Current
Input Bias Current
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Limit
Output Voltage Swing
V
CM
= – 2.5V to 3.5V
V
S
=
±2.375V
to
±5V
V
I
=
±0.5V,
V
C
= 2V (Note 4)
V
S
=
±8V,
V
REF
= 4V
V
S
=
±8V,
V
REF
= –4V
G
E
I
S
Gain Error
Supply Current
V
O
=
±3V,
R
L
= 1k
R
L
= 1k
R
L
= 100Ω
R
L
= 1k
R
L
= 100Ω
CONDITIONS
N8 Package
q
q
q
q
q
q
q
q
q
q
q
q
q
q
MIN
LT1194M
TYP
1
6
0.8
±1
MAX
9
5
±5.5
3.5
UNITS
mV
mV/°C
µA
µA
V
dB
dB
– 2.5
58
60
6
5.9
– 6.1
–6
80
80
±20
6.6
6.5
– 6.7
– 6.5
1
35
±150
mV
V
V
V
V
5
43
%
mA
3
LT1194
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
∆V
OS
/∆T
I
OS
I
B
CMRR
PSRR
V
LIM
V
OUT
PARAMETER
Input Offset Voltage
Input V
OS
Drift
Input Offset Current
Input Bias Current
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Limit
Output Voltage Swing
The
q
denotes specifications which apply over the full operating
temperature range of 0°C
≤
T
A
≤
70°C. V
S
=
±5V,
V
REF
= 0V, Null Pins 1 and 8 open circuit, unless otherwise noted.
CONDITIONS
All Packages
q
q
q
q
q
MIN
LT1194C
TYP
1
6
0.2
±0.5
MAX
7
3.5
±4
3.5
UNITS
mV
µV/°C
µA
µA
V
dB
dB
– 2.5
60
60
6.2
6.1
– 6.4
– 6.2
80
80
±20
6.9
6.7
– 7.2
– 6.6
1
35
V
CM
= – 2.5V to 3.5V
V
S
=
±
2.375V to
±
5V
V
I
=
±0.5V,
V
C
= 2V (Note 4)
V
S
=
±
8V,
V
REF
= 4V
V
S
=
±
8V,
V
REF
= – 4V
R
L
= 1k
R
L
= 100Ω
R
L
= 1k
R
L
= 100Ω
q
q
q
q
q
q
q
q
q
±130
mV
V
V
V
V
G
E
I
S
Gain Error
Supply Current
V
O
=
±3V,
R
L
= 1k
4
43
%
mA
Note 1:
Absolute Maximum Ratings are those values beyond which the
life of a 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:
There are two limitations on signal swing. Output swing is limited
by clipping or saturation in the output stage. Input swing is controlled by
an adjustable input limiting function. On V
S
=
±5V,
the overload
characteristic is output limiting, but on
±8V
the overload characteristic is
input limiting. V
OMAX
is measured with the null pins open circuit.
Note 4:
Output amplitude is reduced by the input limiting function. The
input limiting function occurs when the null pins, 1 and 8, are tied together
and raised to a potential 0.3V or more above the negative supply.
Note 5:
Slew rate is measured between
±1V
on the output, with a
±0.3V
input step.
Note 6:
Full-power bandwidth is calculated from the slew rate
measurement:
FPBW = SR/2πV
P
.
Note 7:
Settling time measurement techniques are shown in “Take the
Guesswork Out of Settling Time Measurements,” EDN, September 19,
1985.
Note 8:
NTSC (3.58MHz).
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 part (S suffix).
Optional Offset Nulling Circuit
5V
3
Input Limiting Connection
5V
3
Input Limiting with Offset Nulling
5V
3
+
–
1
7
LT1194
6
4
8
–5V
+
–
1
7
LT1194
6
4
8
–5V
+
–
1
7
LT1194
6
4
8
–5V
V
C
2
2
2
V
C
INPUT OFFSET VOLTAGE CAN BE ADJUSTED OVER A
±
250mV
RANGE WITH A 1kΩ TO 10kΩ POTENTIOMETER
(NOTE 4)
LT1194 • TA03
(NOTE 4)
4
LT1194
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current
vs Common Mode Voltage
4
3
INPUT BIAS CURRENT (µA)
V
S
=
±5V
INPUT BIAS CURRENT (µA)
–0.4
+I
B
–0.5
I
OS
–0.6
–I
B
COMMON MODE VOLTAGE (V)
2
1
25°C
0
–1
–2
–4
–3
1
3
–2 –1
0
2
COMMON MODE VOLTAGE (V)
4
–55°C
125°C
Equivalent Input Noise Voltage
vs Frequency
EQUIVALENT INPUT NOISE CURRENT (pA/√Hz)
EQUIVALENT INPUT NOISE VOLTAGE (nV/√Hz)
150
V
S
=
±5V
T
A
= 25°C
R
S
= 0Ω
80
SUPPLY CURRENT (mA)
100
50
0
10
100
1k
10k
FREQUENCY (Hz)
100k
Gain, Phase vs Frequency
22
20
VOLTAGE GAIN (dB)
18
16
14
12
10
V
S
=
±5V
T
A
= 25°C
R
L
= 1k
1M
10M
FREQUENCY (Hz)
PHASE
GAIN
20
0
–20
–40
–60
–80
–100
–120
100M
LT1194 • TPC08
–3dB BANDWIDTH (MHz)
GAIN ERROR (%)
8
100k
U W
LT1194 • TPC01
LT1194 • TPC04
Input Bias Current
vs Temperature
–0.3
V
S
=
±5V
10
8
6
4
2
0
–2
–4
–6
–8
–0.8
–50
–10
–25
50
0
25
75
TEMPERATURE (°C)
100
125
Common Mode Voltage
vs Supply Voltage
–55°C
25°C
+V COMMON MODE
125°C
–0.7
–V COMMON MODE
–55°C
25°C
125°C
0
2
6
4
8
±V
SUPPLY VOLTAGE (V)
10
LT1194 • TPC02
LT1194 • TPC03
Equivalent Input Noise Current
vs Frequency
V
S
=
±5V
T
A
= 25°C
R
S
= 100k
50
Supply Current vs Supply Voltage
60
40
–55°C
30
25°C
125°C
20
40
20
10
0
10
100
1k
10k
FREQUENCY (Hz)
100k
0
0
2
4
6
8
±SUPPLY
VOLTAGE (V)
10
LT1194 • TPC05
LT1194 • TPC06
Gain Error vs Temperature
1.0
V
S
=
±5V
36
35
34
33
32
31
30
– 25
50
0
25
75
TEMPERATURE (°C)
100
125
– 3dB Bandwidth vs Supply Voltage
0.8
PHASE SHIFT (DEGREES)
0.6
R
L
= 1k
0.4
R
L
= 100Ω
0.2
T
A
= –55°C, 25°C, 125°C
0
–50
0
2
4
6
SUPPLY VOLTAGE (V)
8
10
LT1194 • TPC07
LT1194 • TPC09
5
