LT1187CN8#PBF [Linear]
LT1187 - Low Power Video Difference Amplifier; Package: PDIP; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LT1187CN8#PBF |
| 厂家： | 
Linear |
| 描述： | LT1187 - Low Power Video Difference Amplifier; Package: PDIP; Pins: 8; Temperature Range: 0°C to 70°C 放大器 光电二极管 |
| 文件： | 总18页 (文件大小：577K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1187
Low Power
Video Difference Amplifier
FEATURES
DESCRIPTION
The LT®1187 is a difference amplifier optimized for opera-
tion on ±±5V or a sinꢀle ±5 sꢁpplꢂ and ꢀain ꢃ≥. This ꢄer-
satile amplifier featꢁres ꢁncommitted hiꢀh inpꢁt imped-
ance (+) and (–) inpꢁtsV and can be ꢁsed in differential or
sinꢀle-ended confiꢀꢁrations. AdditionallꢂV a second set
of inpꢁts ꢀiꢄe ꢀain adjꢁstment and DC control to the dif-
ference amplifier.
n
Differential or Sinꢀle-Ended Gain Block (Adjꢁstable)
n
–3dB BandwidthV A = ±≥2 ±0MHz
5
n
n
n
n
n
n
n
n
n
n
Slew Rate2 16±5/µs
Low Sꢁpplꢂ Cꢁrrent2 13mA
Oꢁtpꢁt Cꢁrrent2 ±≥0mA
CMRR at 10MHz2 40dB
LT1193 Pin Compatible
Low Cost
The LT1187’s hiꢀh slew rateV 16±5/µsV wide bandwidthV
±0MHzV and ±≥0mA oꢁtpꢁt cꢁrrent reqꢁire onlꢂ 13mA of
sꢁpplꢂ cꢁrrent. The shꢁtdown featꢁre redꢁces the power
dissipation to a mere 1±mW and allows mꢁltiple ampli-
fiers to driꢄe the same cable.
Sinꢀle ±5 Operation
Driꢄes Cables Directlꢂ
Oꢁtpꢁt Shꢁtdown
Aꢄailable in 8-Lead PDIP and SO Packaꢀes
The LT1187 is a low power ꢄersion of the popꢁlar LT1193V
and is aꢄailable in 8-pin miniDIPs and SO packaꢀes. For
applications with ꢀains of 10 or moreV see the LT1189
data sheet.
APPLICATIONS
n
Line Receiꢄers
n
5ideo Siꢀnal Processinꢀ
n
Cable Driꢄers
All reꢀistered trademarks and trademarks are the propertꢂ of their respectiꢄe owners.
n
Tape and Disc Driꢄe Sꢂstems
TYPICAL APPLICATION
Cable Sense Amplifier for Loop Through Connections with DC Adjust
Closed-Loop Gain vs Frequency
ꢙꢍ
ꢈ
ꢓꢔ
ꢎ
ꢝ ꢞꢎ
ꢝ 1ꢟ
ꢜ
ꢐ
ꢁ
ꢉꢈ
ꢘꢍ
ꢗꢍ
1ꢍ
ꢍ
ꢎ
ꢏ
ꢍ
ꢋ
7
ꢃꢁꢄꢅꢆ
ꢊ
ꢈ
ꢍꢅꢀ1187
ꢑꢒꢀ
1
8
ꢈ
ꢇꢃ
ꢌ
ꢋ
ꢋꢉꢈ
1ꢐ
1ꢐ
ꢛ1ꢍ
ꢍꢚ1
1
1ꢍ
1ꢍꢍ
1187 ꢀꢁꢂ1
ꢀꢁꢂꢃꢄꢂꢅꢆꢇ ꢈꢉꢊꢋꢌ
1187 ꢑꢒꢍꢗ
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For more information www.linear.com/LT1187
LT1187
ABSOLUTE MAXIMUM RATINGS
(Note 1)
+
–
Jꢁnction Temperatꢁre (Note 3)
Total Sꢁpplꢂ 5oltaꢀe (5 to 5 ).................................185
Plastic Packaꢀes (CN8V CS8) ............................ 1±0°C
Ceramic Packaꢀes (CJ8V MJ8) (OBSOLETE)..... 17±°C
Storaꢀe Temperatꢁre Ranꢀe .................. –6±°C to 1±0°C
Lead Temperatꢁre (SolderinꢀV 10 sec)...................300°C
Differential Inpꢁt 5oltaꢀe ..........................................±65
Inpꢁt 5oltaꢀe.............................................................±5
S
Oꢁtpꢁt Short-Circꢁit Dꢁration (Note ≥) .........Continꢁoꢁs
Operatinꢀ Temperatꢁre Ranꢀe
LT1187C................................................... 0°C to 70°C
LT1187I................................................–40°C to 8±°C
LT1187M (OBSOLETE)....................... –±±°C to 1±0°C
PIN CONFIGURATION
ꢅꢆꢇ ꢈꢉꢊꢋ
ꢅꢆꢇ ꢈꢉꢊꢋ
ꢌꢍꢎꢊꢏ
ꢐꢉꢑ
1
ꢀ
ꢁ
ꢂ
ꢐꢍꢏꢒ
8
7
ꢃ
ꢄ
ꢌꢍꢎꢊꢏ
ꢐꢉꢑ
1
ꢀ
ꢁ
ꢂ
ꢐꢍꢏꢒ
8
7
ꢃ
ꢄ
ꢌ
ꢌ
ꢈ
ꢈ
ꢌꢉꢑ
ꢆꢓꢅ
ꢔꢍꢕ
ꢌꢉꢑ
ꢆꢓꢅ
ꢔꢍꢕ
ꢐ
ꢐ
ꢈ
ꢈ
ꢖ8 ꢇꢗꢘꢙꢗꢚꢊ
8ꢛꢜꢊꢗꢕ ꢘꢊꢎꢕꢉꢇ
ꢑ8 ꢇꢖꢗꢘꢖꢙꢊ
8ꢚꢛꢊꢖꢕ ꢇꢕꢉꢇ
ꢔ8 ꢇꢖꢗꢘꢖꢙꢊ
8ꢚꢛꢊꢖꢕ ꢇꢛꢖꢔꢅꢉꢗ ꢔꢆ
T
JMAX
= 17±°CV θ = 100°C/W
JA
T
= 1±0°CV θ = 100°C/W (N8)
JMAX
JA
T
= 1±0°CV θ = 1±0°C/W (S8)
JMAX
JA
OBSOLETE PACKAGE
ORDER INFORMATION
http://www.linear.com/product/LT1187#orderinfo
LEAD FREE FINISH
LT1187CN8#PBF
LT1187CS8#PBF
LT1187IN8#PBF
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
0°C to 70°C
LT1187CN8#TRPBF
LT1187CS8#TRPBF
LT1187IN8#TRPBF
1187
1187
1187
8-Lead PDIP
8-Lead Plastic SO
8-Lead PDIP
0°C to 70°C
–40°C to 8±°C
OBSOLETE PACKAGE
LT1187MJ8#PBF
LT1187CJ8#PBF
LEAD BASED FINISH
LT1187CN8
LT1187MJ8#TRPBF
LT1187CJ8#TRPBF
TAPE AND REEL
LT1187CN8#TR
LT1187CS8#TR
LT1187IN8#TR
1187
8-Lead CERDIP
8-Lead CERDIP
PACKAGE DESCRIPTION
8-Lead PDIP
–±±°C to 1±0°C
17±°C
1187
PART MARKING*
1187
TEMPERATURE RANGE
0°C to 70°C
LT1187CS8
1187
8-Lead Plastic SO
8-Lead PDIP
0°C to 70°C
LT1187IN8
1187
–40°C to 8±°C
OBSOLETE PACKAGE
LT1187MJ8
LT1187CJ8
LT1187MJ8#TR
LT1187CJ8#TR
1187
1187
8-Lead CERDIP
8-Lead CERDIP
–±±°C to 1±0°C
17±°C
Consꢁlt ADI Marketinꢀ for parts specified with wider operatinꢀ temperatꢁre ranꢀes. *The temperatꢁre ꢀrade is identified bꢂ a label on the shippinꢀ container.
For more information on lead free part markinꢀV ꢀo to2 http2//www.linear.com/leadfree/
For more information on tape and reel specificationsV ꢀo to2 http2//www.linear.com/tapeandreel/. Some packaꢀes are aꢄailable in ±00 ꢁnit reels throꢁꢀh
desiꢀnated sales channels with #TRMPBF sꢁffix.
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For more information www.linear.com/LT1187
LT1187
5V ELECTRICAL CHARACTERISTICS TA = 25°C (Note 4)
VS = 5Vꢀ VREF = 0Vꢀ RFB1 = 900Ω from Pins 6 to 8ꢀ RFB2 = 100Ω from Pin 8 to groundꢀ RL = RFB1 + RFB2 = 1kꢀ CL ≤ 10pFꢀ Pin 5 open.
LT1187C/I/M
SYMBOL
PARAMETERS
CONDITIONS
MIN
MAX
MAX
UNITS
5
Inpꢁt Offset 5oltaꢀe
Either Inpꢁt (Note ±)
S8 Packaꢀe
≥.0
≥.0
10
11
m5
OS
I
I
e
Inpꢁt Offset Cꢁrrent
Inpꢁt Bias Cꢁrrent
Inpꢁt Noise 5oltaꢀe
Inpꢁt Noise Cꢁrrent
Inpꢁt Resistance
Either Inpꢁt
Either Inpꢁt
0.≥
±0.±
6±
1.±
100
≥.0
1.0
±≥.0
µA
µA
n5/√Hz
pA/√Hz
kΩ
OS
B
f = 10kHz
n
O
i
n
f = 10kHz
O
R
C
5
Differential
Either Inpꢁt
(Note 6)
IN
Inpꢁt Capacitance
Inpꢁt 5oltaꢀe Limit
pF
m5
IN
±380
IN LIM
Inpꢁt 5oltaꢀe Ranꢀe
Common Mode Rejection Ratio
Power Sꢁpplꢂ Rejection Ratio
Oꢁtpꢁt 5oltaꢀe Swinꢀ
–≥.±
70
70
±3.8
±6.7
±6.4
3.±
5
dB
dB
5
5
5
CMRR
PSRR
5
= –≥.±5 to 3.±5
100
8±
±4.0
±7.0
±6.8
CM
5 = ±≥.37±5 to ±85
S
5
OUT
5 = ±±5V R = 1kV A = ±0
S
L
L
L
5
5
5 = ±85V R = 1kV A = ±0
S
5 = ±85V R = 300ΩV A = ±0V (Note 4)
S
5
G
SR
FPBW
BW
Gain Error
Slew Rate
5 = ±15V A = 10V R = 1k
0.≥
16±
±3
±.7
≥30
≥6
1.0
%
5/µs
MHz
MHz
ns
E
O
5
L
(Notes 7V 11)
5 = 15 (Note 8)
100
1±0
Fꢁll Power Bandwidth
Small-Siꢀnal Bandwidth
Rise TimeV Fall Time
Propaꢀation Delaꢂ
Oꢄershoot
O
P-P
A = 10
5
t V t
A = ±0V 5 = ±1.±5V ≥0% to 80% (Note 11)
3≥±
r
f
5
O
t
R = 1kV 5 = ±1≥±m5V ±0% to ±0%
ns
%
PD
L
O
5 = ±±0m5
O
0
t
Settlinꢀ Time
35 StepV 0.1% (Note 9)
100
0.6
0.8
13
0.8
±
ns
%
DEG
P-P
s
Diff A5
Diff Ph
Differential Gain
Differential Phase
Sꢁpplꢂ Cꢁrrent
Shꢁtdown Sꢁpplꢂ Cꢁrrent
Shꢁtdown Pin Cꢁrrent
Tꢁrn-On Time
R = 1kV A = 4 (Note 10)
L
5
R = 1kV A = 4 (Note 10)
L
5
I
S
16
1.±
≥±
mA
mA
µA
ns
–
Pin ± at 5
Pin ± at 5
–
I
t
t
S/D
–
Pin ± from 5 to GroꢁndV R = 1k
±00
600
ON
L
–
Tꢁrn-On Time
Pin ± from Groꢁnd to 5 V R = 1k
ns
OFF
L
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For more information www.linear.com/LT1187
LT1187
5V ELECTRICAL CHARACTERISTICS TA = 25°C (Note 4)
VS+ = 5Vꢀ VS– = 0Vꢀ VREF = 2.5Vꢀ RFB1 = 900Ω from Pins 6 to 8ꢀ RFB2 = 100Ω from Pin 8 to VREFꢀ RL = RFB1 + RFB2 = 1kꢀ CL ≤ 10pFꢀ Pin
5 open.
LT1187C/I/M
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
5
OS
Inpꢁt Offset 5oltaꢀe
Either Inpꢁt (Note ±)
SO Packaꢀe
≥.0
≥.0
10
1≥
m5
m5
I
I
Inpꢁt Offset Cꢁrrent
Inpꢁt Bias Cꢁrrent
Inpꢁt 5oltaꢀe Ranꢀe
Common Mode Rejection Ratio
Oꢁtpꢁt 5oltaꢀe Swinꢀ
Either Inpꢁt
Either Inpꢁt
0.≥
±0.±
1.0
±≥.0
3.±
µA
µA
5
dB
5
OS
B
≥.0
70
3.6
CMRR
5
5
CM
= ≥.05 to 3.±5
100
4.0
0.1±
130
±.3
1≥
R = 300Ω to Groꢁnd
5
5
Hiꢀh
Low
OUT
L
OUT
(Note 4)
0.4
5
OUT
SR
BW
I
Slew Rate
Small-Siꢀnal Bandwidth
Sꢁpplꢂ Cꢁrrent
Shꢁtdown Sꢁpplꢂ Cꢁrrent
Shꢁtdown Pin Cꢁrrent
5 = 1.±5 to 3.±5
5/µs
MHz
mA
mA
µA
O
A = 10
5
1±
1.±
≥±
S
Pin ± at 5–
Pin ± at 5–
0.8
±
I
S/D
5V ELECTRICAL CHARACTERISTICS –55°C ≤ TA ≤ 125°C (Note 4)
VS = 5Vꢀ VREF = 0Vꢀ RFB1 = 900Ω from Pins 6 to 8ꢀ RFB2 = 100Ω from Pin 8 to groundꢀ RL = RFB1 + RFB2 = 1kꢀ CL ≤ 10pFꢀ Pin 5 open.
LT1187M
TYP
≥.0
8.0
0.≥
±0.±
SYMBOL
PARAMETER
Inpꢁt Offset 5oltaꢀe
CONDITIONS
Either Inpꢁt (Note ±)
MIN
MAX
1±
UNITS
m5
m5/°C
µA
5
OS
Δ5 /ΔT
Inpꢁt 5 Drift
OS
OS
I
OS
I
B
Inpꢁt Offset Cꢁrrent
Inpꢁt Bias Cꢁrrent
Inpꢁt 5oltaꢀe Ranꢀe
Common Mode Rejection Ratio
Power Sꢁpplꢂ Rejection Ratio
Oꢁtpꢁt 5oltaꢀe Swinꢀ
Either Inpꢁt
Either Inpꢁt
1.±
±3.±
3.±
µA
5
dB
dB
5
5
5
–≥.±
70
60
±3.7
±6.6
±6.4
CMRR
PSRR
5
= –≥.±5 to 3.±5
100
8±
±4.0
±7.0
±6.8
CM
5 = ±≥.37±5 to ±85
S
5
5 = ±±5V R = 1kV A = ±0
OUT
S
L
5
5
5 = ±85V R = 1kV A = ±0
S
L
5 = ±85V R = 300ΩV A = ±0 (Note 4)
S
L
5
G
Gain Error
Sꢁpplꢂ Cꢁrrent
Shꢁtdown Sꢁpplꢂ Cꢁrrent
Shꢁtdown Pin Cꢁrrent
5 = ±15V A = 10V R = 1k
0.≥
13
0.8
±
1.≥
17
1.±
≥±
%
mA
mA
µA
E
O
5
L
I
S
–
Pin ± at 5 (Note 1≥)
–
I
Pin ± at 5
S/D
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For more information www.linear.com/LT1187
LT1187
5V ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C (LT1187C) –40°C ≤ TA ≤ 85°C (LT1187I) (Note 4)
VS = 5Vꢀ VREF = 0Vꢀ RFB1 = 900Ω from Pins 6 to 8ꢀ RFB2 = 100Ω from Pin 8 to groundꢀ RL = RFB1 + RFB2 = 1kꢀ CL ≤ 10pFꢀ Pin 5 open.
LT1187C/I
SYMBOL
PARAMETER
Inpꢁt Offset 5oltaꢀe
CONDITIONS
Either Inpꢁt (Note ±)
MIN
TYP
≥.0
9.0
0.≥
±0.±
MAX
1≥
UNITS
m5
m5/°C
µA
5
OS
Δ5 /ΔT
Inpꢁt 5 Drift
OS
OS
I
OS
I
B
Inpꢁt Offset Cꢁrrent
Inpꢁt Bias Cꢁrrent
Inpꢁt 5oltaꢀe Ranꢀe
Common Mode Rejection Ratio
Power Sꢁpplꢂ Rejection Ratio
Oꢁtpꢁt 5oltaꢀe Swinꢀ
Either Inpꢁt
Either Inpꢁt
1.±
±3.±
3.±
µA
5
dB
dB
5
5
5
–≥.±
70
6±
±3.7
±6.6
±6.4
CMRR
PSRR
5
= –≥.±5 to 3.±5
100
8±
±4.0
±7.0
±6.8
CM
5 = ±≥.37±5 to ±85
S
5
5 = ±±5V R = 1kV A = ±0
OUT
S
L
5
5
5 = ±85V R = 1kV A = ±0
S
L
5 = ±85V R = 300ΩV A = ±0 (Note 4)
S
L
5
G
Gain Error
Sꢁpplꢂ Cꢁrrent
Shꢁtdown Sꢁpplꢂ Cꢁrrent
Shꢁtdown Pin Cꢁrrent
5 = ±15V A = 10V R = 1k
0.≥
13
0.8
±
1.0
17
1.±
≥±
%
mA
mA
µA
E
O
5
L
I
S
–
Pin ± at 5 (Note 1≥)
–
I
Pin ± at 5
S/D
5V ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C (LT1187C) –40°C ≤ TA ≤ 85°C (LT1187I) (Note 4)
VS+ = 5Vꢀ VS– = 0Vꢀ VREF = 2.5Vꢀ RFB1 = 900Ω from Pins 6 to 8ꢀ RFB2 = 100Ω from Pin 8 to VREFꢀ RL = RFB1 + RFB2 = 1kꢀ CL ≤ 10pFꢀ Pin
5 open.
LT1187C/I
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
5
OS
Inpꢁt Offset 5oltaꢀe
Either Inpꢁt (Note ±)
SO Packaꢀe
≥.0
≥.0
1≥.0
13.0
m5
m5
Δ5 /ΔT
Inpꢁt 5 Drift
Inpꢁt Offset Cꢁrrent
Inpꢁt Bias Cꢁrrent
Inpꢁt 5oltaꢀe Ranꢀe
Common Mode Rejection Ratio
Oꢁtpꢁt 5oltaꢀe Swinꢀ
9.0
0.≥
±0.±
µ5/°C
µA
µA
5
OS
OS
I
OS
I
B
Either Inpꢁt
Either Inpꢁt
1.±
±3.±
3.±
≥.0
70
3.±
CMRR
5
CM
= ≥.05 to 3.±5
100
4.0
0.1±
1≥
0.8
±
dB
5
5
R = 300Ω to Groꢁnd
5
5
Hiꢀh
Low
OUT
L
OUT
(Note 4)
0.4
16
1.±
≥±
5
OUT
I
I
Sꢁpplꢂ Cꢁrrent
Shꢁtdown Sꢁpplꢂ Cꢁrrent
Shꢁtdown Pin Cꢁrrent
mA
mA
µA
S
–
Pin ± at 5 (Note 1≥)
–
Pin ± at 5
S/D
Note 1: Stresses beꢂond those listed ꢁnder Absolꢁte Maximꢁm Ratinꢀs
maꢂ caꢁse permanent damaꢀe to the deꢄice. Exposꢁre to anꢂ Absolꢁte
Maximꢁm Ratinꢀ condition for extended periods maꢂ affect deꢄice
reliabilitꢂ and lifetime.
Note 2: A heat sink maꢂ be reqꢁired to keep the jꢁnction temperatꢁre
below absolꢁte maximꢁm when the oꢁtpꢁt is shorted continꢁoꢁslꢂ.
Note 6: 5
is the maximꢁm ꢄoltaꢀe between –5 and +5 (Pin ≥ and
IN IN
IN LIM
Pin 3) for which the oꢁtpꢁt can respond.
Note 7: Slew rate is measꢁred between ±0.±5 on the oꢁtpꢁtV with a 5
step of ±0.7±5V A = 3 and R = 1k.
Note 8: Fꢁll power bandwidth is calcꢁlated from the slew rate
measꢁrement2 FPBW = SR/≥π5 .
Note 9: Settlinꢀ time measꢁrement techniqꢁes are shown in “Take the
Gꢁesswork Oꢁt of Settlinꢀ Time MeasꢁrementsV” EDNV September 19V
198±.
IN
5
L
P
Note 3: T is calcꢁlated from the ambient temperatꢁre T and power
J
A
dissipation P accordinꢀ to the followinꢀ formꢁlas2
D
LT1187MJ8V LT1187CJ82 T = T + (P • 100°C/W)
J
A
D
LT1187CN82
LT1187CS82
T = T + (P • 100°C/W)
J A D
Note 10: NTSC (3.±8MHz).
T = T + (P • 1±0°C/W)
Note 11: AC parameters are 100% tested on the ceramic and plastic DIP
packaꢀed parts (J8 and N8 sꢁffix) and are sample tested on eꢄerꢂ lot of
the SO packaꢀed parts (S8 sꢁffix).
J
A
D
Note 4: When R = 1k is specifiedV the load resistor is R + R V bꢁt
L
FB1
FB≥
when R = 300Ω is specifiedV then an additional 430Ω is added to the
L
oꢁtpꢁt sꢁch that (R + R ) in parallel with 430Ω is R = 300Ω.
Note 12: See Application section for shꢁtdown at eleꢄated temperatꢁres.
FB1
FB≥
L
Do not operate shꢁtdown aboꢄe T > 1≥±°C.
Note 5: 5 measꢁred at the oꢁtpꢁt (Pin 6) is the contribꢁtion from both
J
OS
inpꢁt pair and is inpꢁt referred.
1187fb
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For more information www.linear.com/LT1187
LT1187
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs
Common Mode Voltage vs
Temperature
Common Mode Voltage
Input Bias Current vs Temperature
ꢓ
ꢏ
1ꢍꢍ
ꢍ
ꢙꢐꢏ
ꢘꢐꢎ
ꢆ
ꢕ
ꢜ ꢎꢆ
ꢓ
ꢔꢒꢑꢕ
ꢔ1ꢑꢒ
ꢔ1ꢑꢕ
ꢔꢐꢑꢒ
ꢏ
ꢗ 1ꢑ8ꢏ ꢀꢋ ꢘꢏ
ꢗꢏ
ꢑ
ꢘꢐꢏ
1ꢐꢎ
1ꢐꢏ
ꢏꢐꢎ
ꢋ1ꢍꢍ
ꢋꢕꢍꢍ
ꢋꢔꢍꢍ
ꢋꢎꢍꢍ
ꢋꢏ
ꢑ
ꢏ
ꢘꢒ
ꢍꢎꢎꢛꢀ
ꢐꢑꢒ
1ꢑꢕ
1ꢑꢒ
ꢒꢑꢕ
ꢘꢎꢛꢀ
ꢓ
ꢏ
ꢗ ꢔ1ꢑ8ꢏ ꢀꢋ ꢔꢘꢏ
ꢏ
1ꢘꢎꢛꢀ
ꢔ
ꢏ
ꢍꢏꢐꢎ
ꢔꢕꢒ ꢔꢐꢕ
ꢒ
ꢐꢕ
ꢕꢒ
7ꢕ 1ꢒꢒ 1ꢐꢕ
ꢋꢌꢍ ꢋꢕꢌ
ꢍ
ꢕꢌ
ꢌꢍ
7ꢌ
1ꢍꢍ 1ꢕꢌ
ꢍꢎ ꢍꢚ ꢍꢙ ꢍꢘ ꢍ1
ꢏ
1
ꢘ
ꢙ
ꢚ
ꢎ
ꢀꢁꢂꢃꢁꢄꢅꢀꢆꢄꢁ ꢇꢈꢉꢊ
ꢀꢁꢂꢃꢁꢄꢅꢀꢆꢄꢁ ꢇꢈꢉꢊ
ꢀꢁꢂꢂꢁꢃ ꢂꢁꢄꢅ ꢆꢁꢇꢈꢉꢊꢅ ꢋꢆꢌ
1187 ꢖꢍꢕ
1187 ꢎꢒꢖ
1187 ꢊꢏ1
Equivalent Input Noise Voltage vs
Frequency
Equivalent Input Noise Current vs
Frequency
Supply Current vs Supply Voltage
600
500
400
300
200
100
0
12
10
8
1ꢔ
1ꢓ
1ꢒ
1ꢍ
8
V
T
= 5V
= 25°C
= 100k
V
T
= 5V
= 25°C
= 0Ω
S
S
A
A
R
R
S
S
ꢕꢖꢖꢗꢎ
ꢒꢖꢗꢎ
6
1ꢒꢖꢗꢎ
4
2
0
10
100
1k
10k
100k
10
100
1k
10k
100k
ꢍ
ꢒ
ꢓ
ꢔ
8
1ꢍ
FREQUENCY (Hz)
FREQUENCY (Hz)
ꢀꢁꢂꢂꢃꢄ ꢅꢆꢃꢇꢈꢉꢊ ꢋꢅꢌ
1187 G04
1187 G05
1187 ꢉꢍꢔ
Shutdown Supply Current vs
Temperature
Gain Error vs Temperature
Open-Loop Gain vs Temperature
ꢏ
ꢐꢏꢒꢏꢑ
ꢐꢏꢒ1ꢏ
ꢐꢏꢒ1ꢑ
ꢚ
ꢌ
ꢙ
ꢘ
ꢗ
1
ꢍ
8
6
4
2
0
ꢔ
ꢔ
ꢅ
ꢖ ꢑꢔ
V
V
= 5V
= 3V
ꢕ
ꢍꢆꢀ
ꢔ
ꢄ
S
O
ꢜ
ꢞ ꢌꢜ
ꢎ
ꢖ ꢓꢔ
ꢖ 1ꢏ
ꢖ 1ꢘ
R
L
= 1k
ꢗ
ꢜ
ꢎꢝꢐ
ꢞ ꢋꢜ ꢟ ꢍꢠꢚꢜ
ꢁꢁ
ꢜ
ꢞ ꢋꢜ ꢟ ꢍꢠꢙꢜ
ꢎꢝꢐ
ꢁꢁ
R
L
= 500Ω
ꢜ
ꢎꢝꢐ
ꢞ ꢋꢜ ꢟ ꢍꢠꢗꢜ
ꢁꢁ
ꢜ
ꢎꢝꢐ
ꢞ ꢋꢜ
ꢁꢁ
ꢐꢏꢒꢓꢏ
ꢐꢑꢏ ꢐꢓꢑ
ꢏ
ꢓꢑ
ꢑꢏ
7ꢑ 1ꢏꢏ 1ꢓꢑ
ꢋꢌꢍ ꢋꢗꢌ
ꢍ
ꢗꢌ
ꢌꢍ
7ꢌ 1ꢍꢍ 1ꢗꢌ
–50 –25
0
25
50
75 100 125
ꢀꢁꢂꢃꢁꢄꢅꢀꢆꢄꢁ ꢇꢈꢉ
ꢀꢁꢂꢃꢁꢄꢅꢀꢆꢄꢁ ꢇꢈꢉꢊ
TEMPERATURE (C)
1187 ꢛꢍ7
1187 ꢊꢏ8
1187 G09
1187fb
6
For more information www.linear.com/LT1187
LT1187
TYPICAL PERFORMANCE CHARACTERISTICS
Open-Loop Voltage Gain vs
Gain Bandwidth Product vs
Supply Voltage
Gainꢀ Phase vs Frequency
Load Resistance
1ꢌꢌ
8ꢌ
ꢗꢌ
ꢛꢌ
ꢖꢌ
ꢌ
1ꢌꢌ
8ꢌ
ꢛꢍ
ꢚꢍ
1ꢗꢕ
1ꢖꢕ
8ꢕ
ꢍ
ꢟ ꢠꢍ
ꢟ ꢖꢠꢡꢆ
ꢟ 1ꢘ
ꢈ
ꢅ
ꢝ ꢜꢍꢟꢑ
ꢝ
ꢑ
ꢏ
ꢑ
ꢑ
ꢘ ꢙꢑ
ꢇ
ꢝ ꢠꢚꢚꢞꢖ
ꢆ
ꢁ
ꢂ
ꢈ
ꢇ
ꢐ
ꢘ ꢚꢑ
ꢜꢉꢑꢝꢂ
ꢁ
ꢈ
ꢘ ꢖꢙꢛꢊ
ꢝ ꢜꢚꢞꢖ
ꢈ
ꢗꢌ
ꢇ
ꢝ 1ꢜꢚꢞꢖ
ꢈ
ꢛꢌ
ꢖꢌ
ꢌ
ꢒꢑꢓꢅ
ꢙꢍ
ꢎꢍ
ꢔꢕ
ꢙꢖꢌ
ꢙꢖꢌ
ꢎ
1ꢌꢌꢘ
1ꢚ
1ꢌꢚ
1ꢌꢌꢚ
ꢍ
ꢜ
ꢙ
ꢛ
8
1ꢍ
1ꢎꢎ
1ꢕ
1ꢎꢕ
ꢀꢁꢂꢃꢄꢂꢅꢆꢇ ꢈꢉꢊꢋ
ꢀꢁꢂꢂꢃꢄ ꢅꢆꢃꢇꢈꢉꢊ ꢋꢅꢌ
ꢀꢁꢂꢃ ꢄꢅꢆꢇꢆꢈꢂꢉꢊꢅ ꢋꢌꢍ
1187 ꢒ1ꢌ
1187 ꢉ1ꢜ
1187 ꢒ11
Gain Bandwidth Product and
Unity Gain Phase Margin vs
Temperature
Common Mode Rejection Ratio
vs Frequency
Output Impedance vs Frequency
ꢘꢌ
ꢌꢌ
ꢚꢌ
ꢎꢌ
ꢘꢍ
ꢌꢍ
ꢚꢍ
ꢎꢍ
8ꢗ
7ꢗ
ꢘꢗ
1ꢌꢌ
1ꢌ
ꢙ
ꢏ
ꢛ ꢜꢙ
ꢛ ꢝꢜꢞꢆ
ꢜ
ꢄ
ꢝ ꢌꢜ
ꢝ 1ꢟ
ꢝ
ꢑ
ꢟ ꢖꢝ
ꢟ ꢠꢖꢡꢆ
ꢟ 1ꢙ
ꢚ
ꢔ
ꢛ
ꢞ
ꢞ
ꢓ
ꢁ
ꢢ
ꢏꢅꢐꢑ ꢒꢅꢑꢓꢔꢐꢓꢀꢕ
ꢃꢄꢖꢓꢆꢉꢀ
ꢖꢗ
ꢜꢗ
ꢛꢗ
ꢔ
ꢛ 1ꢌ
ꢛ ꢝ
ꢙ
ꢆꢑꢐꢀꢠ ꢏꢅꢐꢑ
ꢃꢕꢅꢛꢁ ꢂꢅꢄꢏꢐꢑ
1ꢍꢌ
ꢌꢍ1
ꢔ
ꢙ
ꢋꢌꢍ ꢋꢙꢌ
ꢍ
ꢙꢌ
ꢌꢍ
7ꢌ 1ꢍꢍ 1ꢙꢌ
1ꢖ
1ꢌꢖ
1ꢌꢌꢖ
1ꢒ
1ꢌꢒ
1ꢌꢌꢒ
1ꢗꢗꢙ
1ꢍ
1ꢗꢍ
1ꢗꢗꢍ
ꢀꢁꢂꢃꢁꢄꢅꢀꢆꢄꢁ ꢇꢈꢉꢊ
ꢀꢁꢂꢃꢄꢂꢅꢆꢇ ꢈꢉꢊꢋ
ꢀꢁꢂꢃꢄꢂꢅꢆꢇ ꢈꢉꢊꢋ
1187 ꢏ1ꢎ
1187 ꢚ1ꢖ
1187 ꢗ1ꢘ
Power Supply Rejection Ratio vs
Frequency
Output Short-Circuit Current vs
Temperature
Output Swing vs Supply Voltage
ꢐ
ꢅ
8ꢌ
ꢚꢌ
ꢙꢌ
ꢘꢌ
ꢌ
ꢎꢗ
ꢑꢒꢓ7
ꢑꢒꢓ8
ꢑꢒꢓꢘ
ꢑ1ꢓꢒ
ꢑ1ꢓ1
ꢟ
ꢠ ꢡꢟ
ꢐ
ꢕ
ꢚ
ꢛ ꢌꢚ
ꢐ
ꢓ
ꢠ ꢘꢡꢢꢆ
ꢟ
ꢠ ꢣꢌꢌꢤꢟ
1ꢕꢙꢚꢛ
ꢁꢔꢍꢍꢑꢂ
ꢎꢌ
ꢕꢙꢚꢛ
ꢎꢖ
ꢎꢎ
ꢎꢘ
ꢎ1
ꢎꢍ
ꢥꢍꢐꢁꢁ
ꢞꢍꢐꢁꢁ
ꢑꢙꢙꢚꢛ
ꢍ
ꢜ 1ꢝ
ꢃ
1ꢓ8ꢅ ꢅ ꢘꢅ
ꢀ
1ꢕꢙꢚꢛ
ꢕꢙꢚꢛ
ꢒꢓꢙ
ꢒꢓꢖ
ꢒꢓꢔ
ꢑꢙꢙꢚꢛ
ꢒꢓꢕ
ꢒꢓ1
ꢞꢘꢌ
ꢑ
1ꢛ
1ꢌꢛ
1ꢌꢌꢛ
1ꢜ
1ꢌꢜ
1ꢌꢌꢜ
ꢋꢌꢍ ꢋꢘꢌ
ꢍ
ꢘꢌ
ꢌꢍ
7ꢌ
1ꢍꢍ 1ꢘꢌ
ꢒ
ꢕ
ꢖ
ꢗ
8
1ꢒ
ꢅ
ꢀꢁꢂꢃꢄꢂꢅꢆꢇ ꢈꢉꢊꢋ
ꢀꢁꢂꢃꢁꢄꢅꢀꢆꢄꢁ ꢇꢈꢉꢊ
ꢀꢁꢂꢂꢃꢄ ꢅꢆꢃꢇꢈꢉꢊ ꢋꢅꢌ
1187 ꢝ1ꢚ
1187 ꢙ17
1187 ꢉ18
1187fb
7
For more information www.linear.com/LT1187
LT1187
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Swing vs
Load Resistance
Output Voltage Step vs
Settling Timeꢀ AV = 2
Slew Rate vs Temperature
ꢐ
ꢕ
ꢒꢖꢓ
ꢒꢓꢓ
1ꢖꢓ
ꢌ
ꢔ
ꢎ
ꢘ ꢖꢎ
ꢘ 1ꢙ
ꢘ ꢓꢛꢖꢎ
ꢘ ꢒ
ꢒ
ꢘ ꢕꢒ
ꢘ ꢔꢕꢙꢚ
ꢘ 1ꢜ
ꢋ
ꢄ
ꢀ
ꢓ
ꢃ
ꢓ
ꢆ
ꢗ ꢐꢓ
ꢈ
ꢂ
ꢌ
ꢚ
ꢎ
ꢎ
ꢅ
ꢛ
ꢗ ꢏꢐꢐꢘꢊ
ꢂ
1ꢍꢝꢒ
ꢈ
ꢗ ꢙꢐꢘꢊ
ꢗ ꢙꢐꢘꢊ
ꢂ
ꢕꢋꢌꢁꢍ ꢄꢅꢀꢁ
ꢈ
ꢗ 1ꢙꢐꢘꢊ
ꢂ
1
ꢍ
ꢗꢋꢌꢁꢍ ꢄꢅꢀꢁ
ꢏ1
ꢏꢕ
ꢏꢐ
ꢈ
ꢂ
ꢎꢔ
ꢎꢌ
1ꢍꢝꢒ
ꢈ
ꢗ ꢏꢐꢐꢘꢊ
ꢂ
ꢈ
ꢗ 1ꢙꢐꢘꢊ
ꢂ
1ꢎ
1ꢎꢎ
ꢀꢁꢂꢃ ꢄꢅꢆꢇꢆꢈꢂꢉꢊꢅ ꢋꢌꢍ
1ꢎꢎꢎ
ꢕꢖꢓ ꢕꢒꢖ
ꢓ
ꢒꢖ
ꢖꢓ
7ꢖ 1ꢓꢓ 1ꢒꢖ
ꢌꢍ
ꢕꢍ
ꢖꢍ
7ꢍ
8ꢍ
ꢗꢍ
1ꢍꢍ
ꢀꢁꢂꢃꢁꢄꢅꢀꢆꢄꢁ ꢇꢈꢉꢊ
ꢀꢁꢂꢂꢃꢄꢅꢆ ꢂꢄꢇꢁ ꢈꢉꢊꢋ
1187 ꢔ1ꢖ
1187 ꢑꢒꢓ
1187 ꢆꢔ1
Harmonic Distortion vs
Output Voltage
Large-Signal Transient Response
ꢕꢖꢌ
ꢄ
ꢜ ꢗꢄ
ꢜ ꢚꢗꢝꢞ
ꢜ 1ꢟ
ꢏ
ꢆ
ꢅ
ꢂ
ꢐ
ꢕꢖꢗ
ꢕꢘꢌ
ꢕꢘꢗ
ꢕꢗꢌ
ꢕꢗꢗ
ꢕꢙꢌ
f ꢜ 1ꢠꢛꢡ
ꢜ 1ꢌ
ꢛꢍ
ꢆ
ꢖ
ꢄ
ꢛꢍ
ꢚ
ꢘ
ꢙ
7
ꢌ
1
ꢚ
ꢖ
ꢗ
ꢀꢁꢂꢃꢁꢂ ꢄꢀꢅꢂꢆꢇꢈ ꢉꢄ
ꢋ
ꢃꢊꢃ
1187 G23
ꢀꢁꢂꢃꢄ ꢀꢁ ꢅꢀꢆꢀꢄꢀꢁꢇꢈ ꢉ ꢋ ꢌꢈ ꢍꢎ ꢋ 18ꢏꢊꢐꢑꢒ
ꢊ
1187 ꢇꢚꢚ
Small-Signal Transient Response
Small-Signal Transient Response
1187 G24
1187 G25
ꢀ
ꢁ
ꢂ ꢃꢄ ꢅ ꢂ 1ꢈꢄ ꢉꢁꢊꢅꢋꢌꢉꢉꢍ ꢂ ꢃꢎꢏ
ꢆꢇ
ꢀ
ꢁ
ꢂ ꢃꢄ ꢅ ꢂ 1ꢈꢄ ꢉꢁꢊꢅꢋꢌꢉꢉꢍ ꢂ ꢃꢎꢏ
ꢆꢇ
1187fb
8
For more information www.linear.com/LT1187
LT1187
APPLICATIONS INFORMATION
The primarꢂ ꢁse of the LT1187 is in conꢄertinꢀ hiꢀh speed
differential siꢀnals to a sinꢀle-ended oꢁtpꢁt. The LT1187
ꢄideo difference amplifier has two ꢁncommitted hiꢀh
inpꢁt impedance (+) and (–) inpꢁts. The amplifier has
another set of inpꢁts which can be ꢁsed for reference and
feedback. AdditionallꢂV this set of inpꢁts ꢀiꢄe ꢀain adjꢁst
and DC control to the difference amplifier. The ꢄoltaꢀe
ꢀain of the LT1187 is set like a conꢄentional operational
amplifier. Feedback is applied to Pin 8V and it is optimized
for ꢀains of ≥ or ꢀreater. The amplifier can be operated
sinꢀle-ended bꢂ connectinꢀ either the (+) or (–) inpꢁts to
the +/REF (Pin 1). The ꢄoltaꢀe ꢀain is set bꢂ the resistors2
Power Supply Bypassing
The LT1187 is qꢁite tolerant of power sꢁpplꢂ bꢂpass-
inꢀ. In some applications a 0.1µF ceramic disc capacitor
placed 1/≥ inch from the amplifier is all that is reqꢁired. In
applications reqꢁirinꢀ ꢀood settlinꢀ timeV it is important
to ꢁse mꢁltiple bꢂpass capacitors. A 0.1µF ceramic disc
in parallel with a 4.7µF tantalꢁm is recommended.
Calculating the Output Offset Voltage
Both inpꢁt staꢀes contribꢁte to the oꢁtpꢁt offset ꢄoltaꢀe at
Pin 6. The feedback correction forces balance in the inpꢁt
staꢀes bꢂ introdꢁcinꢀ an inpꢁt 5OS at Pin 8. The complete
expression for the oꢁtpꢁt offset ꢄoltaꢀe is2
(R + R )/R .
FB
G
G
Like the sinꢀle-ended caseV the differential ꢄoltaꢀe ꢀain
5
=(5 +I (R )+I (R ))•(R +R )/R +I (R )
OS OS S B REF FB G G B FB
OUT
is set bꢂ the external resistors2 (R + R )/R . The maxi-
G
G
mꢁm inpꢁt differential siꢀnal forFBwhich the oꢁtpꢁt will
R represents the inpꢁt soꢁrce resistanceV tꢂpicallꢂ 7±ΩV
S
respond is approximatelꢂ ±0.385.
and R represents the finite soꢁrce impedance from the
REF
DC reference ꢄoltaꢀeV for 5 ꢀroꢁndedV R = 0Ω. The
REF
REF
I
is normallꢂ a small contribꢁtor and the expression
ꢍꢎꢏ
ꢍꢎꢏ
OS
ꢁ
ꢁ
ꢀ
ꢀ
simplifies to2
ꢐ
ꢐ
ꢉ
ꢊ
ꢉ
ꢊ
7
7
ꢀ
ꢁ
ꢋꢌ
ꢁ
ꢀ
5
OUT
= 5 (R + R )/R + I (R )
ꢅ ꢃꢄ1187
ꢋꢌ
ꢅ ꢃꢄ1187
ꢂ
ꢂ
OS FB
G
G
B
FB
ꢀ
ꢀ
ꢇꢈꢄ
1
8
1
8
ꢇꢈꢄ
ꢁꢎꢓꢖꢔ
ꢁꢎꢓꢖꢔ
If R is limited to 1k the last term of the eqꢁation con-
ꢅꢎꢔꢕ
ꢅꢎꢔꢕ
FB
ꢆ
ꢆ
tribꢁtes onlꢂ ≥m5V since I is less than ≥µA.
ꢅ
ꢅ
B
ꢀ
ꢀ
ꢓ
ꢔꢕ
ꢓ
ꢔꢕ
ꢓ
ꢁ
ꢁ
ꢓ
ꢘ
ꢔꢕ
ꢓ
ꢓ
ꢘ
ꢔꢕ
ꢑ
ꢒ ꢁ
ꢀ
ꢓ
ꢘ
ꢑ
ꢀ
ꢒ ꢅ
ꢓ
ꢘ
ꢀ
ꢓ
ꢘ
ꢓ
ꢘ
7
ꢐ
ꢆ
ꢍꢎꢏ
ꢍꢎꢏ
ꢁ
ꢁ
ꢀ
ꢀ
ꢐ
ꢐ
ꢉ
ꢊ
ꢉ
ꢊ
7
7
ꢁ
ꢁ
ꢁ
ꢃꢅ
ꢀ
ꢀ
ꢋꢌ ꢏꢋꢔꢔ
ꢋꢌ ꢏꢋꢔꢔ
ꢅ ꢃꢄ1187
ꢅ ꢃꢄ1187
8
ꢂ
ꢂ
ꢓ1
ꢓꢏ
ꢓꢇ
ꢓꢍ
ꢀ
ꢀ
ꢇꢈꢄ
1
8
1
8
ꢇꢈꢄ
ꢀ
ꢁꢎꢓꢖꢔ
ꢅꢎꢔꢕ
ꢁꢎꢓꢖꢔ
ꢅꢎꢔꢕ
ꢋꢌ
ꢓ
ꢘ
ꢁ
ꢄ
ꢀ
ꢁ
ꢋꢌ
ꢓ
ꢇ
ꢏ
1
ꢁꢂꢃ
ꢀ
ꢀ
ꢎ
ꢆ
ꢆ
ꢁ
ꢁ
ꢂ
1ꢑ1ꢒ
ꢂ
1ꢑ1ꢒ
ꢅ
ꢅ
ꢀ
ꢓ
ꢀ
ꢁ
ꢌ
ꢁ
ꢌ
ꢁ
ꢁꢂꢃ
ꢓ
ꢔꢕ
ꢔꢕ
ꢇꢍꢈꢊꢋ
ꢇꢈꢉꢊꢋ
ꢓ
ꢔꢕ
ꢓ
ꢁꢓ
ꢘ
ꢓ
ꢘ
ꢔꢕ
ꢔꢕ
ꢎ
ꢀ
ꢒ ꢗꢀ
ꢁ ꢀ
ꢙ
ꢀ
ꢇ
ꢒ
ꢀ
ꢅ
ꢀ
ꢋꢌ
ꢍ
ꢐ
ꢇ
ꢋꢌ ꢏꢋꢔꢔ
ꢋꢌ
ꢋꢌ ꢏꢋꢔꢔ
ꢗ
ꢗ
ꢗ
ꢗ
ꢓ
ꢘ
1187 F02
ꢓ
ꢓ
ꢓ
ꢘ
ꢘ
ꢘ
1187 F01
Figure 1.
Figure 2. Simplified Input Stage Schematic
1187fb
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For more information www.linear.com/LT1187
LT1187
APPLICATIONS INFORMATION
Operating with Low Closed-Loop Gains
The LT1187 has been optimized for closed-loop ꢀains
of ≥ or ꢀreater. For a closed-loop ꢀain of ≥ the response
peaks aboꢁt ≥dB. Peakinꢀ can be eliminated bꢂ placinꢀ a
capacitor across the feedback resistorV (feedback zero).
This peakinꢀ shows ꢁp as time domain oꢄershoot of aboꢁt
≥±%.
ꢙ
8
1187 F05
ꢆ
ꢠ ꢚꢣꢀ
ꢀꢘ
ꢀ
ꢁ
ꢂ ꢃꢄ ꢅꢆꢇꢈ 8ꢉꢊ ꢊꢋꢋꢌꢍꢀꢎꢏ ꢎꢀꢐꢀꢎꢆꢇꢑꢒ
7
ꢥ
ꢝ
Figure 5. Small-Signal Transient Response
ꢆ
ꢀꢘ
ꢠ ꢝꢣꢀ
ꢤ
ꢟ
ꢡ
ꢆ
ꢠ 1ꢚꢣꢀ
ꢀꢘ
Extending the Input Range
ꢒ
ꢠ ꢝꢒ
ꢠ ꢡꢝꢢꢆ
ꢠ ꢡ
ꢎ
ꢔ
ꢓ
1
ꢚ
Fiꢀꢁre ≥ shows a simplified schematic of the LT1187. In
normal operation REFV Pin 1V is ꢀroꢁnded or taken to a DC
offset control ꢄoltaꢀe and differential siꢀnals are applied
between Pins ≥ and 3. The inpꢁt responds linearlꢂ ꢁntil
all of the 34±µA cꢁrrent flows throꢁꢀh the 1.1k resistor
and Q1 (or Q≥) tꢁrns off. Therefore the maximꢁm inpꢁt
ꢔ
ꢒ
ꢁ
ꢁ
ꢠ ꢙꢚꢚΩ
ꢀꢘ
ꢠ ꢙꢚꢚΩ
ꢕ
ꢞ1
1ꢚꢚꢜ
1ꢛ
1ꢚꢛ
1ꢚꢚꢛ
ꢀꢁꢂꢃꢄꢂꢅꢆꢇ ꢈꢉꢊꢋ
1187 F03
Figure 3. Closed-Loop Voltage Gain vs Frequency
swinꢀ is 380m5 or 760m5 . The second differential
P
P-P
pairV Q3 and Q4V is rꢁnninꢀ at sliꢀhtlꢂ larꢀer cꢁrrent so
that when the first inpꢁt staꢀe limitsV the second staꢀe
remains biased to maintain the feedback.
Occasionallꢂ it is necessarꢂ to handle siꢀnals larꢀer than
760m5 at the inpꢁt. The LT1187 inpꢁt staꢀe can be
P-P
tricked to handle ꢁp to 1.±5 . To do thisV it is necessarꢂ
to ꢀroꢁnd Pin 3 and applꢂP-tPhe differential inpꢁt siꢀnal
between Pins 1 and ≥. The inpꢁt siꢀnal is now applied
across two 1.1k resistors in series. Since the inpꢁt siꢀnal
is applied to both inpꢁt pairsV the first pair will rꢁn oꢁt of
bias cꢁrrent before the second pairV caꢁsinꢀ the amplifier
to ꢀo open loop. The resꢁlts of this techniqꢁe are shown
in the followinꢀ scope photo.
1187 F04
ꢀ
ꢁ
ꢂ ꢃꢄ ꢅꢁꢆꢇꢈꢉꢅꢅꢊ ꢂ ꢃꢋꢌꢄ ꢇ ꢂ ꢇ ꢂ 1ꢐ
ꢍꢎ ꢏ
Figure 4. Small-Signal Transient Response
1187fb
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LT1187
APPLICATIONS INFORMATION
The abilitꢂ to maintain shꢁtoff is shown on the cꢁrꢄe
Shꢁtdown Sꢁpplꢂ Cꢁrrent ꢄs Temperatꢁre in the Tꢂpical
Performance Characteristics section. At ꢄerꢂ hiꢀh ele-
ꢄated temperatꢁre it is important to hold the shꢁtdown
pin close to the neꢀatiꢄe sꢁpplꢂ to keep the sꢁpplꢂ cꢁrrent
from increasinꢀ.
Send Color Video Over Twisted-Pair
With an LT1187 it is possible to send and receiꢄe color
composite ꢄideo siꢀnals more than 1000 feet on a low
cost twisted-pair. A bidirectional “ꢄideo bꢁs” consists
of the LT119± op amp and the LT1187 ꢄideo difference
amplifier. A pair of LT119±s at Transmit 1 is ꢁsed to ꢀen-
erate differential siꢀnals to driꢄe the line which is back-
terminated in its characteristic impedance. The LT1187
twisted-pair receiꢄer conꢄerts siꢀnals from differential to
sinꢀle-ended. Topoloꢀꢂ of the LT1187 proꢄides for cable
compensation at the amplifier’s feedback node as shown.
In this caseV 1000 feet of twisted-pair is compensated
with 1000pF and ±0Ω to boost the 3dB bandwidth of the
sꢂstem from 7±0kHz to 4MHz. This bandwidth is adeqꢁate
to pass a 3.±8MHz chroma sꢁbcarrier and the 4.±MHz
soꢁnd sꢁbcarrier. Attenꢁation in the cable can be compen-
1187 F06
ꢀꢁꢂ ꢃꢄꢁꢅꢆꢁꢇꢆ ꢈꢅꢉꢊꢄꢃꢋ ꢉꢈꢅꢃ ꢌ ꢄꢍ ꢎꢋ ꢏ ꢐ 1ꢑꢒꢏ
ꢈꢅ
ꢉꢓꢉ
ꢀꢔꢂ ꢕꢖꢄꢕꢅꢆꢕꢆ ꢈꢅꢉꢊꢄꢃꢋ ꢉꢈꢅꢃ ꢌ ꢄꢍ ꢌꢋ ꢏ ꢐ 1ꢑꢒꢏ
ꢈꢅ
ꢈꢅ
ꢉꢓꢉ
ꢉꢓꢉ
ꢀꢗꢂ ꢕꢖꢄꢕꢅꢆꢕꢆ ꢈꢅꢉꢊꢄꢃꢋ ꢉꢈꢅꢃ 1 ꢄꢍ ꢌꢋ ꢏ ꢐ ꢌꢑꢒꢏ
Figure 6. LT1187 in Unity Gain
Using the Shutdown Feature
The LT1187 has a ꢁniqꢁe featꢁre that allows the amplifier
to be shꢁtdown for conserꢄinꢀ powerV or for mꢁltiplexinꢀ
seꢄeral amplifiers onto a common cable. The amplifier
–
will shꢁt down bꢂ takinꢀ Pin ± to 5 . In shꢁtdownV the
amplifier dissipates 1±mW while maintaininꢀ a trꢁe hiꢀh
impedance oꢁtpꢁt state of ≥0k in parallel with the feed-
back resistors. For MUX applicationsV the amplifiers maꢂ
be confiꢀꢁred inꢄertinꢀV noninꢄertinꢀ or differential. When
the oꢁtpꢁt is loaded with as little 1k from the amplifier’s
feedback resistorsV the amplifier shꢁts off in 600ns. This
shꢁtoff can be ꢁnder the control of HC CMOS operatinꢀ
between 05 and –±5.
sated bꢂ lowerinꢀ the ꢀain set resistor R . At Transmit ≥V
G
another pair of LT119±s serꢄe the dꢁal fꢁnction to proꢄide
cable termination ꢄia low oꢁtpꢁt impedanceV and ꢀener-
ate differential siꢀnals for Transmit ≥. Cable termination
is made ꢁp of a 1±Ω and 33Ω attenꢁator to redꢁce the
differential inpꢁt siꢀnal to the LT1187. Maximꢁm inpꢁt
siꢀnal for the LT1187 is 760m5
.
P-P
1187 F07
1187 F08
ꢀ
ꢂ ꢃꢄ ꢅ ꢂ ꢅ ꢂ 1ꢉ
ꢆꢇ ꢈ
ꢁ
Figure 7. 1MHz Sine Wave Gated Off with Shutdown Pin
Figure 8. 1.5MHz Square Wave Input and Unequalized Response
Through 1000 Feet of Twisted-Pair
1187fb
11
For more information www.linear.com/LT1187
LT1187
APPLICATIONS INFORMATION
1187 F09
1187 F10
Figure 9. 1.5MHz Square Wave Input and Equalized Response
Through 1000 Feet of Twisted-Pair
Figure 10. Multiburst Pattern Passed Through 1000 Feet of
Twisted-Pair
TRANSMIT 1
TRANSMIT 2
3
3
+
+
6
6
1k
1k
LT1195
1k
LT1195
75Ω
75Ω
2
2
–
–
1k
1k
1k
1k
1k
2
3
2
3
–
+
–
+
6
6
LT1195
LT1195
33Ω
15Ω
33Ω
15Ω
33Ω
15Ω
33Ω
S/D
5
S/D
5
3
2
1
8
3
+
–
+
–
+
–
+
15Ω
2
1
8
75Ω
75Ω
6
6
LT1187
LT1187
1000 FEET
TWISTED-PAIR
–
R
R
FB
300Ω
FB
300Ω
1000pF
1000pF
50Ω
R
G
R
300Ω
G
50Ω
300Ω
1187 F11
RECEIVE 2
RECEIVE 1
Figure 11. Bidirectional Video Bus
1187fb
12
For more information www.linear.com/LT1187
LT1187
SIMPLIFIED SCHEMATIC
ꢀ
ꢅ
7
ꢀ
ꢀ
ꢅ
ꢆꢇꢈꢉ
ꢅ
ꢆꢇꢈꢉ
ꢊ
ꢋ
ꢀ
ꢍ
ꢊ
ꢌꢌ
ꢎ
ꢁ
ꢅ
ꢔ
ꢀꢅ
ꢀꢅ
ꢂꢃꢄ
ꢕ
ꢁ
ꢅ
ꢖ
ꢏ
ꢉꢐꢓ
1 ꢀꢐꢑꢒꢌ
8
ꢁꢐꢌꢆ
ꢕ ꢉꢃꢆꢉꢄꢑꢈꢄꢒ ꢓꢇꢂꢓꢒꢗ ꢓꢂ ꢘꢂꢄ ꢌꢂꢑꢙꢈꢑꢓ ꢆꢇꢈꢉ
1187 ꢉꢉ
1187fb
13
For more information www.linear.com/LT1187
LT1187
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LT1187#packaging for the most recent package drawings.
J8 Package
8-Lead CERDIP (Narrow .300 Inchꢀ Hermetic)
(Reference LTC DWG # 0±-08-1110)
ꢂꢃꢁꢊ
ꢇ1ꢁꢂꢅ87ꢉ
ꢋꢌꢍ
ꢒꢝꢔꢏꢜꢔ ꢛꢜꢌꢕꢑ ꢝꢘꢖꢎꢝꢏ
ꢇꢃ ꢘꢛꢒꢑꢉ
ꢂꢁꢁꢊ
ꢇꢁꢂ1ꢅ7ꢉ
ꢋꢎꢏ
ꢆ
ꢊ
ꢃ
8
7
ꢅ
ꢂꢁꢅꢈ ꢄ ꢂꢁꢃꢊ
ꢇꢁꢂꢊ8ꢃ ꢄ 1ꢂ1ꢃꢈꢉ
ꢞꢌꢛꢙ ꢛꢜꢌꢕ
ꢝꢘꢖꢎꢝꢏ
ꢂꢁꢅꢊ
ꢇꢁꢂꢆꢈꢊꢉ
ꢔꢌꢕ ꢖꢗꢘ
ꢂꢅꢅꢁ ꢄ ꢂꢈ1ꢁ
ꢇꢊꢂꢊ88 ꢄ 7ꢂ87ꢃꢉ
ꢂꢁꢃꢊ ꢄ ꢂꢁꢆ8
ꢇ1ꢂ1ꢃꢈ ꢄ 1ꢂꢆꢊꢁꢉ
ꢙꢚꢛꢛ ꢛꢜꢌꢕ
ꢝꢘꢖꢎꢝꢏ
1
ꢈ
ꢂꢅꢁꢁ
ꢂꢈꢁꢁ ꢐꢑꢒ
ꢇꢊꢂꢁ8ꢁꢉ
ꢋꢌꢍ
ꢇ7ꢂꢆꢅ ꢐꢑꢒꢉ
ꢂꢁ1ꢊ ꢄ ꢂꢁꢆꢁ
ꢇꢁꢂꢈ81 ꢄ 1ꢂꢊꢅꢃꢉ
ꢂꢁꢁ8 ꢄ ꢂꢁ18
ꢇꢁꢂꢅꢁꢈ ꢄ ꢁꢂꢃꢊ7ꢉ
ꢁꢓ ꢄ 1ꢊꢓ
ꢂꢁꢃꢊ ꢄ ꢂꢁꢆꢊ
ꢇ1ꢂ1ꢃꢈ ꢄ 1ꢂꢆꢊ1ꢉ
ꢂ1ꢅꢊ
ꢈꢂ17ꢊ
ꢋꢎꢏ
ꢏꢝꢖꢜꢟ ꢛꢜꢌꢕ ꢕꢎꢋꢜꢏꢑꢎꢝꢏꢑ ꢌꢘꢘꢛꢗ ꢖꢝ ꢑꢝꢛꢕꢜꢔ ꢕꢎꢘꢠꢘꢛꢌꢖꢜ
ꢝꢔ ꢖꢎꢏ ꢘꢛꢌꢖꢜ ꢛꢜꢌꢕꢑ
ꢂꢁ1ꢃ ꢄ ꢂꢁꢅꢆ
ꢇꢁꢂꢈꢆꢁ ꢄ ꢁꢂꢆꢆꢁꢉ
ꢂ1ꢁꢁ
ꢇꢅꢂꢊꢃꢉ
ꢐꢑꢒ
ꢀ8 ꢁ8ꢁ1
OBSOLETE PACKAGE
1187fb
14
For more information www.linear.com/LT1187
LT1187
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LT1187#packaging for the most recent package drawings.
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 0±-08-1±10 Reꢄ I)
ꢆꢎꢅꢅꢕ
ꢉ1ꢅꢆ1ꢇꢅꢊ
ꢒꢖꢗ
8
7
ꢇ
ꢈ
ꢎ
ꢆꢑꢈꢈ ±ꢆꢅ1ꢈꢕ
ꢉꢇꢆꢎ77 ±ꢅꢆꢐ81ꢊ
1
ꢑ
ꢐ
ꢆ1ꢐꢅ ±ꢆꢅꢅꢈ
ꢆꢐꢅꢅ ꢏ ꢆꢐꢑꢈ
ꢆꢅꢎꢈ ꢏ ꢆꢅꢇꢈ
ꢉꢐꢆꢐꢅꢑ ±ꢅꢆ1ꢑ7ꢊ
ꢉ1ꢆ1ꢎꢐ ꢏ 1ꢆꢇꢈ1ꢊ
ꢉ7ꢆꢇꢑꢅ ꢏ 8ꢆꢑꢈꢈꢊ
ꢆꢅꢇꢈ
ꢉ1ꢆꢇꢈ1ꢊ
ꢋꢌꢍ
ꢆꢅꢅ8 ꢏ ꢆꢅ1ꢈ
ꢉꢅꢆꢑꢅꢐ ꢏ ꢅꢆꢐ81ꢊ
ꢆ1ꢑꢅ
ꢆꢅꢑꢅ
ꢉꢅꢆꢈꢅ8ꢊ
ꢒꢄꢀ
ꢉꢐꢆꢅꢎ8ꢊ
ꢒꢄꢀ
ꢓꢆꢅꢐꢈ
ꢆꢐꢑꢈ
ꢏꢆꢅ1ꢈ
ꢆꢅ18 ±ꢆꢅꢅꢐ
ꢉꢅꢆꢎꢈ7 ±ꢅꢆꢅ7ꢇꢊ
ꢆ1ꢅꢅ
ꢉꢑꢆꢈꢎꢊ
ꢢꢛꢜ
ꢓꢅꢆ88ꢔ
8ꢆꢑꢈꢈ
ꢀ8 ꢁꢂꢃ ꢄ ꢅ711
(
)
ꢏꢅꢆꢐ81
ꢀꢘꢋꢂꢙ
ꢄꢀꢜꢝꢂꢛ
1ꢆ ꢚꢄꢒꢂꢀꢛꢄꢘꢀꢛ ꢖꢁꢂ
ꢒꢄꢞꢞꢄꢒꢂꢋꢂꢁꢛ
ꢕꢋꢝꢂꢛꢂ ꢚꢄꢒꢂꢀꢛꢄꢘꢀꢛ ꢚꢘ ꢀꢘꢋ ꢄꢀꢜꢞꢟꢚꢂ ꢒꢘꢞꢚ ꢠꢞꢖꢛꢝ ꢘꢁ ꢍꢁꢘꢋꢁꢟꢛꢄꢘꢀꢛꢆ
ꢒꢘꢞꢚ ꢠꢞꢖꢛꢝ ꢘꢁ ꢍꢁꢘꢋꢁꢟꢛꢄꢘꢀꢛ ꢛꢝꢖꢞꢞ ꢀꢘꢋ ꢂꢗꢜꢂꢂꢚ ꢆꢅ1ꢅ ꢄꢀꢜꢝ ꢉꢅꢆꢑꢈꢎꢡꢡꢊ
1187fb
15
For more information www.linear.com/LT1187
LT1187
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LT1187#packaging for the most recent package drawings.
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 0±-08-1610 Reꢄ G)
ꢀ18ꢓ ꢃ ꢀ1ꢓ7
ꢅꢆꢀ8ꢁ1 ꢃ ꢄꢀꢁꢁꢆꢈ
ꢀꢁꢆꢄ ±ꢀꢁꢁꢄ
ꢖꢎꢉꢐ ꢌ
ꢀꢁꢄꢁ ꢔꢍꢕ
7
ꢄ
8
ꢂ
ꢀꢇꢆꢄ
ꢗꢘꢖ
ꢀ1ꢂꢁ ±ꢀꢁꢁꢄ
ꢀ1ꢄꢁ ꢃ ꢀ1ꢄ7
ꢅꢌꢀ81ꢁ ꢃ ꢌꢀꢓ88ꢈ
ꢖꢎꢉꢐ ꢌ
ꢀꢇꢇ8 ꢃ ꢀꢇꢆꢆ
ꢅꢄꢀ7ꢓ1 ꢃ ꢂꢀ1ꢓ7ꢈ
ꢀꢁꢌꢁ ±ꢀꢁꢁꢄ
ꢉꢊꢋ
1
ꢌ
ꢆ
ꢇ
ꢏꢐꢕꢎꢗꢗꢐꢖꢙꢐꢙ ꢍꢎꢚꢙꢐꢏ ꢋꢛꢙ ꢚꢛꢊꢎꢜꢉ
ꢀꢁ1ꢁ ꢃ ꢀꢁꢇꢁ
ꢅꢁꢀꢇꢄꢆ ꢃ ꢁꢀꢄꢁ8ꢈ
× ꢆꢄ°
ꢀꢁꢄꢌ ꢃ ꢀꢁꢂꢓ
ꢅ1ꢀꢌꢆꢂ ꢃ 1ꢀ7ꢄꢇꢈ
ꢀꢁꢁꢆ ꢃ ꢀꢁ1ꢁ
ꢅꢁꢀ1ꢁ1 ꢃ ꢁꢀꢇꢄꢆꢈ
ꢀꢁꢁ8 ꢃ ꢀꢁ1ꢁ
ꢅꢁꢀꢇꢁꢌ ꢃ ꢁꢀꢇꢄꢆꢈ
ꢁ°ꢃ 8° ꢉꢊꢋ
ꢀꢁ1ꢂ ꢃ ꢀꢁꢄꢁ
ꢅꢁꢀꢆꢁꢂ ꢃ 1ꢀꢇ7ꢁꢈ
ꢀꢁꢄꢁ
ꢅ1ꢀꢇ7ꢁꢈ
ꢔꢍꢕ
ꢀꢁ1ꢆ ꢃ ꢀꢁ1ꢓ
ꢅꢁꢀꢌꢄꢄ ꢃ ꢁꢀꢆ8ꢌꢈ
ꢉꢊꢋ
ꢖꢎꢉꢐꢞ
ꢘꢖꢕꢝꢐꢍ
1ꢀ ꢙꢘꢗꢐꢖꢍꢘꢎꢖꢍ ꢘꢖ
ꢅꢗꢘꢚꢚꢘꢗꢐꢉꢐꢏꢍꢈ
ꢇꢀ ꢙꢏꢛꢟꢘꢖꢒ ꢖꢎꢉ ꢉꢎ ꢍꢕꢛꢚꢐ
ꢌꢀ ꢉꢝꢐꢍꢐ ꢙꢘꢗꢐꢖꢍꢘꢎꢖꢍ ꢙꢎ ꢖꢎꢉ ꢘꢖꢕꢚꢜꢙꢐ ꢗꢎꢚꢙ ꢠꢚꢛꢍꢝ ꢎꢏ ꢋꢏꢎꢉꢏꢜꢍꢘꢎꢖꢍꢀ
ꢗꢎꢚꢙ ꢠꢚꢛꢍꢝ ꢎꢏ ꢋꢏꢎꢉꢏꢜꢍꢘꢎꢖꢍ ꢍꢝꢛꢚꢚ ꢖꢎꢉ ꢐꢡꢕꢐꢐꢙ ꢀꢁꢁꢂꢢ ꢅꢁꢀ1ꢄꢣꢣꢈ
ꢆꢀ ꢋꢘꢖ 1 ꢕꢛꢖ ꢔꢐ ꢔꢐꢑꢐꢚ ꢐꢙꢒꢐ ꢎꢏ ꢛ ꢙꢘꢗꢋꢚꢐ
ꢍꢎ8 ꢏꢐꢑ ꢒ ꢁꢇ1ꢇ
1187fb
16
For more information www.linear.com/LT1187
LT1187
REVISION HISTORY (Revision history begins at Rev B)
REV
DATE
DESCRIPTION
PAGE NUMBER
B
1≥/17 Corrected slew rate.
Added hꢂperlinks.
1
All
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Information fꢁrnished bꢂ Analoꢀ Deꢄices is belieꢄed to be accꢁrate and reliable. HoweꢄerV no responsibilitꢂ is assꢁmed bꢂ Analoꢀ
Deꢄices for its ꢁseV nor for anꢂ infrinꢀements of patents or other riꢀhts of third parties that maꢂ resꢁlt from its ꢁse. Specifications
sꢁbject to chanꢀe withoꢁt notice. No license is ꢀranted bꢂ implication or otherwise ꢁnder anꢂ patent or patent riꢀhts of Analoꢀ Deꢄices.
For more information www.linear.com/LT1187
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LT1187
RELATED PARTS
PART NUMBER
DESCRIPTION
LT1189
Low Power 5ideo Difference Amplifier
Adjꢁstable Gain 5ideo Difference Amplifier
Gain = 10 5ideo Difference Amplifier
≥±0mA OꢁtV 9005/µsV 60MHz CFA
1mAV 1≥MHz 4005/µs Op Amplifier
3.35 5ideo Difference Amplifier
LT1193
LT1194
LT1≥06
LT13±4
LT6±±≥
LT6±±9
Low Cost ±5/±±5 Triple 5ideo Amplifier with Shꢁtdown
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LT 1217 REV B • PRINTED IN USA
www.linear.com/LT1187
ANALOG DEVICES, INC. 2017
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相关型号：
LT1187CS8#PBF
LT1187 - Low Power Video Difference Amplifier; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
Linear
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