LT1187
Low Power
Video Difference Amplifier
FEATURES
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DESCRIPTION
The LT
®
1187 is a difference amplifier optimized for op-
eration on ±5V, or a single 5V supply and gain ≥2. This
versatile amplifier features uncommitted high input imped-
ance (+) 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/ms, 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 amplifiers
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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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
Available in 8-Lead PDIP and SO Packages
APPLICATIONS
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Line Receivers
Video Signal Processing
Cable Drivers
Tape and Disc Drive Systems
TYPICAL APPLICATION
Cable Sense Amplfier for Loop Through Connections with DC Adjust
V
IN
5V
3
CABLE
V
DC
2
1
8
VOLTAGE GAIN (dB)
40
Closed-Loop Gain vs Frequency
V
S
=
±5V
R
L
= 1k
+
–
+
–
30
6
7
LT1187
4
–5V
1k
V
OUT
20
10
0
1k
–10
0.1
LT1187 • TA01
1
10
FREQUENCY (MHz)
100
LT1187 • TA02
1187fa
1
LT1187
ABSOLUTE MAXIMUM RATINGS
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
LT1187C .................................................. 0°C to 70°C
LT1187I ............................................... –40°C to 85°C
LT1187M
(OBSOLETE)
...................... –55°C to 150°C
Junction Temperature (Note 3)
Plastic Packages (CN8, CS8) ............................ 150°C
Ceramic Packages (CJ8, MJ8)
(OBSOLETE)
..... 175°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
+/REF 1
–IN 2
+IN 3
V
–
4
8
7
6
5
–/FB
V
+
OUT
S/D
ORDER PART
NUMBER
LT1187CN8
LT1187CS8
LT1187IN8
S8 PART MARKING
1187
LT1187MJ8
LT1187CJ8
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP
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
= 175°C,
θ
JA
= 100°C/W
Consider the N8 or S8 Packages for Alternate Source
OBSOLETE PACKAGE
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
±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
PARAMETERS
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 4)
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 5)
S8 Package
Either Input
Either Input
f
O
= 10kHz
f
O
= 10kHz
Differential
Either Input
(Note 6)
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 4)
V
O
= ±1V, A
V
= 10, R
L
= 1k
(Notes 7, 11)
V
O
= 1V
P-P
(Note 8)
A
V
= 10
A
V
= 50, V
O
= ±1.5V, 20% to 80% (Note 11)
R
L
= 1k, V
O
= ±125mV, 50% to 50%
V
O
= ±50mV
3V Step, 0.1% (Note 9)
R
L
= 1k, A
V
= 4 (Note 10)
R
L
= 1k, A
V
= 4 (Note 10)
MIN
LT1187C/I/M
MAX
2.0
2.0
0.2
±0.5
65
1.5
100
2.0
±380
100
85
±4.0
±7.0
±6.8
0.2
165
53
5.7
230
26
0
100
0.6
0.8
MAX
10
11
1.0
±2.0
UNITS
mV
µA
µA
nV/√Hz
pA/√Hz
kΩ
pF
mV
V
dB
dB
V
V
V
%
V/µs
MHz
MHz
ns
ns
%
ns
%
DEG
P-P
1187fa
–2.5
70
70
±3.8
±6.7
±6.4
100
3.5
G
E
SR
FPBW
BW
t
r
, t
f
t
PD
t
s
Diff AV
Diff Ph
Gain Error
Slew Rate
Full Power Bandwidth
Small-Signal Bandwidth
Rise Time, Fall Time
Propagation Delay
Overshoot
Settling Time
Differential Gain
Differential Phase
1.0
150
325
2
LT1187
±5V ELECTRICAL CHARACTERISTICS
SYMBOL
I
S
I
S/D
t
ON
t
OFF
PARAMETERS
Supply Current
Shutdown Supply Current
Shutdown Pin Current
Turn-On Time
Turn-On Time
CONDITIONS
Pin 5 at V
–
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 4)
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
LT1187C/I/M
MAX
13
0.8
5
500
600
MAX
16
1.5
25
UNITS
mA
mA
µA
ns
ns
V
S
= 5V, V
S
open.
SYMBOL
V
OS
I
OS
I
B
CMRR
V
OUT
SR
BW
I
S
I
S/D
5V ELECTRICAL CHARACTERISTICS
+
–
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
T
A
= 25°C (Note 4)
= 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
CONDITIONS
Either Input (Note 5)
SO Package
Either Input
Either Input
V
CM
= 2.0V to 3.5V
R
L
= 300Ω to Ground
(Note 4)
V
O
= 1.5V to 3.5V
A
V
= 10
Pin 5 at V–
Pin 5 at V–
MIN
LT1187C/I/M
TYP
2.0
2.0
0.2
±0.5
100
4.0
0.15
130
5.3
12
0.8
5
MAX
10
12
1.0
±2.0
3.5
UNITS
mV
mV
µA
µA
V
dB
V
V
V/µs
MHz
mA
mA
µA
V
OUT
High
V
OUT
Low
2.0
70
3.6
0.4
15
1.5
25
±5V ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
ΔV
OS
/ΔT
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
–55°C ≤ T
A
≤ 125°C (Note 4)
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 5)
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 4)
V
O
= ±1V, A
V
= 10, R
L
= 1k
Pin 5 at V
–
(Note 12)
Pin 5 at V
–
–2.5
70
60
±3.7
±6.6
±6.4
MIN
LT1187M
TYP
2.0
8.0
0.2
±0.5
100
85
±4.0
±7.0
±6.8
0.2
13
0.8
5
MAX
15
1.5
±3.5
3.5
UNITS
mV
mV/°C
µA
µA
V
dB
dB
V
V
V
%
mA
mA
µA
G
E
I
S
I
S/D
Gain Error
Supply Current
Shutdown Supply Current
Shutdown Pin Current
1.2
17
1.5
25
1187fa
3
LT1187
±5V ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
ΔV
OS
/ΔT
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
0°C ≤ T
A
≤ 70°C (LT1187C) –40°C ≤ T
A
≤ 85°C (LT1187I) (Note 4)
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 5)
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 4)
V
O
= ±1V, A
V
= 10, R
L
= 1k
Pin 5 at V
–
(Note 12)
Pin 5 at V
–
–2.5
70
65
±3.7
±6.6
±6.4
MIN
LT1187C/I
TYP
2.0
9.0
0.2
±0.5
100
85
±4.0
±7.0
±6.8
0.2
13
0.8
5
MAX
12
1.5
±3.5
3.5
UNITS
mV
mV/°C
µA
µA
V
dB
dB
V
V
V
%
mA
mA
µA
G
E
I
S
I
S/D
Gain Error
Supply Current
Shutdown Supply Current
Shutdown Pin Current
1.0
17
1.5
25
0°C ≤ T
A
≤ 70°C (LT1187C) –40°C ≤ T
A
≤ 85°C (LT1187I) (Note 4)
V
S
= 5V, V
S
= 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.
SYMBOL
V
OS
ΔV
OS
/ΔT
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
CONDITIONS
Either Input (Note 5)
SO Package
Either Input
Either Input
V
CM
= 2.0V to 3.5V
R
L
= 300Ω to Ground
(Note 4)
Pin 5 at V
–
(Note 12)
Pin 5 at V
–
2.0
70
3.5
MIN
LT1187C/I
TYP
2.0
2.0
9.0
0.2
±0.5
100
4.0
0.15
12
0.8
5
MAX
12.0
13.0
1.5
±3.5
3.5
UNITS
mV
mV
µV/°C
µA
µA
V
dB
V
V
mA
mA
µA
5V ELECTRICAL CHARACTERISTICS
+
–
V
OUT
High
V
OUT
Low
0.4
16
1.5
25
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted continuously.
Note 3:
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 4:
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 5:
V
OS
measured at the output (Pin 6) is the contribution from both
input pair and is input referred.
Note 6:
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 7:
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 8:
Full power bandwidth is calculated from the slew rate
measurement: FPBW = SR/2πV
P
.
Note 9:
Settling time measurement techniques are shown in “Take the
Guesswork Out of Settling Time Measurements,” EDN, September 19,
1985.
Note 10:
NTSC (3.58MHz).
Note 11:
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 12:
See Application section for shutdown at elevated temperatures.
Do not operate shutdown above T
J
> 125°C.
1187fa
4
LT1187
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs
Common Mode Voltage
3.0
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
– 400
–50
INPUT BIAS CURRENT (nA)
0
V
S
=
±5V
100
+I
B
Input Bias Current vs Temperature
V
+
–0.5
COMMON MODE RANGE (V)
–1.0
–1.5
–2.0
Common Mode Voltage vs
Temperature
V
+
= 1.8V TO 9V
–100
I
OS
–200
–I
B
2.0
1.5
1.0
0.5
V
–
– 50 –25
V
+
= –1.8V TO –9V
–300
–25
50
0
25
75
TEMPERATURE (°C)
100
125
0
25
75
50
TEMPERATURE (°C)
100
125
LT1187 • TPC01
LT1187 • TPC02
LT1187 • TPC03
Equivalent Input Noise Voltage vs
Frequency
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
V
S
=
±5V
T
A
= 25°C
R
S
= 0Ω
12
10
8
6
4
2
0
Equivalent Input Noise Current vs
Frequency
V
S
=
±5V
T
A
= 25°C
R
S
= 100k
SUPPLY CURRENT (mA)
16
Supply Current vs Supply Voltage
14
– 55°C
25°C
12
125°C
10
10
100
1k
10k
FREQUENCY (Hz)
100k
8
0
2
4
6
8
±SUPPLY
VOLTAGE (V)
10
LT1187 • TPC04
LT1187 • TPC05
LT1187 • TPC06
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
V
S/D
= –V
EE
+ 0.6V
V
S/D
= –V
EE
+ 0.4V
–0.05
0
Gain Error vs Temperature
V
S
=
±5V
V
OUT
=
±2V
A
V
= 10
R
L
= 1k
8
Open-Loop Gain vs Temperature
V
S
=
±5V
V
O
=
±3V
R
L
= 1k
OPEN-LOOP GAIN (kV/V)
6
–0.10
4
R
L
= 500Ω
–0.15
2
–0.20
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0
–50 –25
0
50
25
75
TEMPERATURE (°C)
100
125
LT1187 • TPC07
LT1187 • TPC08
LT1187 • TPC09
1187fa
5
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