LT1187
Low Power
Video Difference Amplifier
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Differential or Single-Ended Gain Block (Adjustable)
–3dB Bandwidth, A
V
=
±2
50MHz
Slew Rate
165V/µs
Low Supply Current
13mA
Output Current
±
20mA
CMRR at 10MHz
40dB
LT1193 Pin Compatible
Low Cost
Single 5V Operation
Drives Cables Directly
Output Shutdown
The LT1187 is a difference amplifier optimized for opera-
tion on
±5V,
or a single 5V supply, and gain
≥2.
This
versatile amplifier features uncommitted high input im-
pedance (+) 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
difference amplifier.
The LT1187’s high slew rate, 165V/µs, wide bandwidth,
50MHz, and
±20mA
output current require only 13mA of
supply current. The shutdown feature reduces the power
dissipation to a mere 15mW, and allows multiple amplifi-
ers to drive the same cable.
The LT1187 is a low power version of the popular LT1193,
and is available in 8-pin miniDIPs and SO packages. For
applications with gains of 10 or more, see the LT1189
data sheet.
APPLICATI
s
s
s
s
S
Line Receivers
Video Signal Processing
Cable Drivers
Tape and Disc Drive Systems
TYPICAL APPLICATI
Cable Sense Amplifier for Loop Through Connections
with DC Adjust
40
V
IN
5V
CABLE
V
DC
2
1
8
+
–
LT1187
+
–
4
–5V
1k
7
6
V
OUT
Closed-Loop Gain vs Frequency
30
VOLTAGE GAIN (dB)
3
20
10
0
1k
LT1187 • TA01
–10
0.1
U
V
S
= ±5V
R
L
= 1k
1
10
FREQUENCY (MHz)
100
LT1187 • TA02
UO
UO
1
LT1187
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
+/REF
–IN
+IN
V
–
1
2
3
4
8
7
6
5
–/FB
V
+
OUT
S/D
Total Supply Voltage (V
+
to V
–
) ............................. 18V
Differential Input Voltage ........................................
±6V
Input Voltage ..........................................................
±V
S
Output Short Circuit Duration (Note 1) ........ Continuous
Operating Temperature Range
LT1187M ..................................... – 55°C to 150°C
LT1187C............................................. 0°C to 70°C
Junction Temperature (Note 2)
Plastic Package (CN8,CS8) ......................... 150°C
Ceramic Package (CJ8,MJ8) ....................... 175°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................ 300°C
ORDER PART
NUMBER
LT1187MJ8
LT1187CJ8
LT1187CN8
LT1187CS8
S8 PART MARKING
1187
J8 PACKAGE
N8 PACKAGE
8-LEAD HERMETIC DIP 8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
LT1187 • POI01
T
JMAX
= 175°C,
θ
JA
= 100°C/W (J8)
T
JMAX
= 150°C,
θ
JA
= 100°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 150°C/W (S8)
Consult factory for Industrial grade parts.
+5V
ELECTRICAL CHARACTERISTICS
–
SYMBOL
V
OS
I
OS
I
B
e
n
i
n
R
IN
C
IN
V
IN LIM
CMRR
PSRR
V
OUT
PARAMETER
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Input Resistance
Input Capacitance
Input Voltage Limit
Input Voltage Range
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
T
A
= 25°C, (Note 3)
V
S
=
±5V,
V
REF
= 0V, R
FB1
= 900Ω from pins 6 to 8, R
FB2
= 100Ω from pin 8 to ground, R
L
= R
FB1
+ R
FB2
= 1k, C
L
≤
10pF, pin 5 open.
CONDITIONS
Either Input, (Note 4)
SOIC Package
Either Input
Either Input
f
O
= 10kHz
f
O
= 10kHz
Differential
Either Input
(Note 5)
–2.5
V
CM
= –2.5V to 3.5V
V
S
=
±2.375V
to
±8V
V
S
=
±5V,
R
L
= 1k, A
V
= 50
V
S
=
±8V,
R
L
= 1k, A
V
= 50
V
S
=
±8V,
R
L
= 300Ω, A
V
= 50, (Note 3)
G
E
SR
FPBW
BW
t
r
, t
f
t
PD
t
s
Diff A
V
Diff Ph
I
S
Gain Error
Slew Rate
Full Power Bandwidth
Small Signal Bandwidth
Rise Time, Fall Time
Propagation Delay
Overshoot
Settling Time
Differential Gain
Differential Phase
Supply Current
Shutdown Supply Current
Pin 5 at V
–
V
O
=
±1V,
A
V
= 10, R
L
= 1k
(Note 6, 10)
V
O
= 1V
P-P
, (Note 7)
A
V
= 10
A
V
= 50, V
O
=
±1.5V,
20% to 80% (Note 10)
R
L
= 1k, V
O
=
±125mV,
50% to 50%
V
O
=
±
50mV
3V Step, 0.1%, (Note 8)
R
L
= 1k, A
V
= 4, (Note 9)
R
L
= 1k, A
V
= 4, (Note 9)
150
100
70
70
±3.8
±6.7
±6.4
100
85
±4.0
±7.0
±
6.8
0.2
165
53
5.7
230
26
0
100
0.6
0.8
13
0.8
16
1.5
325
1.0
%
V/µs
MHz
MHz
ns
ns
%
ns
%
DEG
P-P
mA
mA
MIN
LT1187M/C
TYP
MAX
2.0
10
2.0
11
0.2
±0.5
65
1.5
100
2.0
±380
3.5
1.0
±2.0
UNITS
mV
mV
µA
µA
nV/√Hz
pA/√Hz
kΩ
pF
mV
V
dB
dB
V
2
U
W
U
U
W W
W
LT1187
+5V
ELECTRICAL CHARACTERISTICS
–
SYMBOL
I
S/D
t
ON
t
OFF
PARAMETER
Shutdown Pin Current
Turn On Time
Turn Off Time
CONDITIONS
Pin 5 at V
–
Pin 5 from V
–
to Ground, R
L
= 1k
Pin 5 from Ground to V
–
, R
L
= 1k
T
A
= 25°C, (Note 3)
V
S
=
±5V,
V
REF
= 0V, R
FB1
= 900Ω from pins 6 to 8, R
FB2
= 100Ω from pin 8 to ground, R
L
= R
FB1
+ R
FB2
= 1k, C
L
≤
10pF, pin 5 open.
MIN
LT1187M/C
TYP
MAX
5
500
600
25
UNITS
µA
ns
ns
5V
ELECTRICAL CHARACTERISTICS
+
–
V
S
= 5V, V
S
open.
SYMBOL
V
OS
I
OS
I
B
CMRR
V
OUT
SR
BW
I
S
I
S/D
PARAMETER
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Voltage Range
Common-Mode Rejection Ratio
Output Voltage Swing
Slew Rate
Small-Signal Bandwidth
Supply Current
Shutdown Supply Current
Shutdown Pin Current
Pin 5 at V
–
Pin 5 at V
–
CONDITIONS
T
A
= 25°C, (Note 3)
= 0V, V
REF
= 2.5V, R
FB1
= 900Ω from pins 6 to 8, R
FB2
= 100Ω from pin 8 to V
REF
, R
L
= R
FB1
+ R
FB2
= 1k, C
L
≤
10pF, pin 5
MIN
LT1187M/C
TYP
MAX
2.0
2.0
0.2
±
0.5
2.0
V
CM
= 2.0V to 3.5V
R
L
= 300Ω to Ground
(Note 3)
V
O
= 1.5V to 3.5V
A
V
= 10
V
OUT
High
V
OUT
Low
70
3.6
100
4.0
0.15
130
5.3
12
0.8
5
15
1.5
25
0.4
V/µs
MHz
mA
mA
µA
10
12
1.0
±
2.0
3.5
UNITS
mV
mV
µA
µA
V
dB
V
Either Input, (Note 4)
SOIC Package
Either Input
Either Input
+5V
ELECTRICAL CHARACTERISTICS
–
SYMBOL
V
OS
∆V
OS
/∆T
I
OS
I
B
CMRR
PSRR
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 Swing
Either Input
Either Input
CONDITIONS
–55°C
≤
T
A
≤
125°C, (Note 3)
V
S
=
±5V,
V
REF
= 0V, R
FB1
= 900Ω from pins 6 to 8, R
FB2
= 100Ω from pin 8 to ground, R
L
= R
FB1
+ R
FB2
= 1k, C
L
≤
10pF, pin 5 open.
MIN
LT1187M
TYP
MAX
2.0
8.0
0.2
±
0.5
–2.5
V
CM
= –2.5V to 3.5V
V
S
=
±2.375V
to
±8V
V
S
=
±5V,
R
L
= 1k, A
V
= 50
V
S
=
±8V,
R
L
= 1k, A
V
= 50
V
S
=
±8V,
R
L
= 300Ω, A
V
= 50, (Note 3)
G
E
I
S
I
S/D
Gain Error
Supply Current
Shutdown Supply Current
Shutdown Pin Current
Pin 5 at V , (Note 11)
Pin 5 at V
–
–
UNITS
mV
µV/°C
µA
µA
V
dB
dB
V
Either Input, (Note 4)
15
1.5
±3.5
3.5
70
60
±3.7
±6.6
±6.4
100
85
±
4.0
±7.0
±
6.8
0.2
13
0.8
5
1.2
17
1.5
25
V
O
=
±1V,
A
V
= 10, R
L
= 1k
%
mA
mA
µA
3
LT1187
+5V
ELECTRICAL CHARACTERISTICS
0°C
≤
T
A
≤
70°C, (Note 3)
–
=
±5V,
V = 0V, R = 900Ω from pins 6 to 8, R = 100Ω from pin 8 to ground, R = R
V
S
REF
FB1
FB2
L
FB1
+ R
FB2
= 1k, C
L
≤
10pF, pin 5 open.
MIN
LT1187C
TYP
MAX
2.0
9.0
0.2
±
0.5
– 2.5
70
65
±3.7
±6.6
±6.4
100
85
±4.0
±7.0
±
6.8
0.2
13
0.8
5
1.0
17
1.5
25
%
mA
mA
µA
12
1.5
±3.5
3.5
UNITS
mV
µV/°C
µA
µA
V
dB
dB
V
SYMBOL
V
OS
∆V
OS
/∆T
I
OS
I
B
CMRR
PSRR
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 Swing
CONDITIONS
Either Input, (Note 4)
Either Input
Either Input
V
CM
= –2.5V to 3.5V
V
S
=
±2.375V
to
±8V
V
S
=
±5V,
R
L
= 1k, A
V
= 50
V
S
=
±8V,
R
L
= 1k, A
V
= 50
V
S
=
±8V,
R
L
= 300Ω, A
V
= 50, (Note 3)
G
E
I
S
I
S/D
Gain Error
Supply Current
Shutdown Supply Current
Shutdown Pin Current
V
O
=
±1V,
A
V
= 10, R
L
= 1k
Pin 5 at V
–
, (Note 11)
Pin 5 at V
–
5V
ELECTRICAL CHARACTERISTICS
+
–
V
S
= 5V, V
S
SYMBOL
V
OS
∆V
OS
/∆T
I
OS
I
B
CMRR
V
OUT
I
S
I
S/D
PARAMETER
Input Offset Voltage
Input V
OS
Drift
Input Offset Current
Input Bias Current
Input Voltage Range
Common-Mode Rejection Ratio
Output Voltage Swing
Supply Current
Shutdown Supply Current
Shutdown Pin Current
Either Input
Either Input
CONDITIONS
0°C
≤
T
A
≤
70°C, (Note 3)
= 0V, V
REF
= 2.5V, R
FB1
= 900Ω from pins 6 to 8, R
FB2
= 100Ω from pin 8 to V
REF
, R
L
= R
FB1
+ R
FB2
= 1k, C
L
≤
10pF, pin 5 open.
MIN
LT1187C
TYP
MAX
2.0
2.0
9.0
0.2
±
0.5
2.0
V
CM
= 2.0V to 3.5V
R
L
= 300Ω to Ground
(Note 3)
Pin 5 at V
–
, (Note 11)
Pin 5 at V
–
V
OUT
High
V
OUT
Low
70
3.5
100
4.0
0.15
12
0.8
5
0.4
16
1.5
25
mA
mA
µA
1.5
±
3.5
3.5
12.0
13.0
UNITS
mV
mV
µV/°C
µA
µA
V
dB
V
Either Input, (Note 4)
SOIC Package
Note 1:
A heat sink may be required to keep the junction temperature below
absolute maximum when the output is shorted continuously.
Note 2:
T
J
is calculated from the ambient temperature T
A
and power dissipation
P
D
according to the following formulas:
LT1187MJ8,LT1187CJ8: T
J
= T
A
+ (P
D
×
100°C/W)
LT1187CN8:
T
J
= T
A
+ (P
D
×
100°C/W)
LT1187CS8:
T
J
= T
A
+ (P
D
×
150°C/W)
Note 3:
When R
L
= 1k is specified, the load resistor is R
FB1
+ R
FB2
, but when
R
L
= 300Ω is specified, then an additional 430Ω is added to the output such
that (R
FB1
+ R
FB2
) in parallel with 430Ω is R
L
= 300Ω.
Note 4:
V
OS
measured at the output (pin 6) is the contribution from both input
pair, and is input referred.
Note 5:
V
IN LIM
is the maximum voltage between –V
IN
and +V
IN
(pin 2 and
pin 3) for which the output can respond.
Note 6:
Slew rate is measured between
±0.5V
on the output, with a V
IN
step
of
±0.75V,
A
V
= 3 and R
L
= 1k.
Note 7:
Full power bandwidth is calculated from the slew rate measurement:
FPBW = SR/2πVp.
Note 8:
Settling time measurement techniques are shown in “Take the
Guesswork Out of Settling Time Measurements,” EDN, September 19, 1985.
Note 9:
NTSC (3.58MHz).
Note 10:
AC parameters are 100% tested on the ceramic and plastic DIP
packaged parts (J8 and N8 suffix) and are sample tested on every lot of the SO
packaged parts (S8 suffix).
Note 11:
See Application section for shutdown at elevated temperatures. Do
not operate shutdown above T
J
> 125°C.
4
LT1187
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current vs
Common-Mode Voltage
3.0
V
S
= ±5V
2.5
INPUT BIAS CURRENT (µA)
2.0
1.5
1.0
0.5
0
–0.5
–5 –4 –3 –2 –1 0 1 2 3
COMMON-MODE VOLTAGE (V)
4
5
–55°C
25°C
125°C
COMMON-MODE RANGE (V)
INPUT BIAS CURRENT (nA)
Equivalent Input Noise Voltage vs
Frequency
V
S
= ±5V
T
A
= 25°C
R
S
= 0Ω
EQUIVALENT INPUT NOISE CURRENT (pA/
√
Hz)
EQUIVALENT INPUT NOISE VOLTAGE (nV/
√
Hz)
600
500
400
300
200
100
0
10
100
1k
10k
FREQUENCY (Hz)
100k
8
6
4
2
0
10
100
1k
10k
FREQUENCY (Hz)
100k
SUPPLY CURRENT (mA)
Shutdown Supply Current vs
Temperature
6
SHUTDOWN SUPPLY CURRENT (mA)
V
S
= ±5V
5
GAIN ERROR (%)
4
3
V
S/D
= –V
EE
+ 0.2V
2
1
V
S/D
= –V
EE
0
–50
–25
50
0
25
75
TEMPERATURE (°C)
100
125
–0.20
–50
–25
–0.05
V
S/D
= –V
EE
+ 0.6V
V
S/D
= –V
EE
+ 0.4V
OPEN-LOOP GAIN (kV/V)
U W
LT1187 • TPC01
Input Bias Current vs Temperature
100
+I
B
Common-Mode Voltage vs
Temperature
V
+
–0.5
V
+
= 1.8V TO 9V
0
–1.0
–1.5
–2.0
–100
I
OS
–200
–I
B
2.0
1.5
1.0
0.5
V
–
– 50 –25
V
+
= –1.8V TO –9V
–300
– 400
–50
–25
0
25
75
50
TEMPERATURE (°C)
100
125
0
25
75
50
TEMPERATURE (°C)
100
125
LT1187 • TPC02
LT1187 • TPC03
Equivalent Input Noise Current vs
Frequency
12
10
V
S
= ±5V
T
A
= 25°C
R
S
= 100k
16
Supply Current vs Supply Voltage
14
– 55°C
25°C
12
125°C
10
8
0
2
4
6
8
±SUPPLY VOLTAGE (V)
10
LT1187 • TPC04
LT1187 • TPC05
LT1187 • TPC06
Gain Error vs Temperature
0
V
S
= ±5V
V
OUT
= ±2V
A
V
= 10
R
L
= 1k
8
Open-Loop Gain vs Temperature
V
S
= ±5V
V
O
= ±3V
6
R
L
= 1k
–0.10
4
R
L
= 500Ω
–0.15
2
0
25
50
75
TEMPERATURE (°C)
100
125
0
–50 –25
25
75
0
50
TEMPERATURE (°C)
100
125
LT1187 • TPC07
LT1187 • TPC08
LT1187 • TPC09
5
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