LT1630/LT1631
30MHz, 10V/µs, Dual/Quad
Rail-to-Rail Input and Output
Precision Op Amps
Description
Features
n
n
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n
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Gain-Bandwidth Product: 30MHz
Slew Rate: 10V/µs
Low Supply Current per Amplifier: 3.5mA
Input Common Mode Range Includes Both Rails
Output Swings Rail-to-Rail
Input Offset Voltage, Rail-to-Rail: 525µV Max
Input Offset Current: 150nA Max
Input Bias Current: 1000nA Max
Open-Loop Gain: 1000V/mV Min
Low Input Noise Voltage: 6nV/√Hz Typ
Low Distortion: –91dBc at 100kHz
Wide Supply Range: 2.7V to ±15V
Large Output Drive Current: 35mA Min
Dual in 8-Pin PDIP and SO Packages
Quad in Narrow 14-Pin SO Package
The LT®1630/LT1631 are dual/quad, rail-to-rail input and
output op amps with a 30MHz gain-bandwidth product
and a 10V/µs slew rate.
The LT1630/LT1631 have excellent DC precision over the
full range of operation. Input offset voltage is typically
less than 150µV and the minimum open-loop gain of one
million into a 10k load virtually eliminates all gain error.
To maximize common mode rejection, the LT1630/LT1631
employ a patented trim technique for both input stages,
one at the negative supply and the other at the positive
supply, that gives a typical CMRR of 106dB over the full
input range.
The LT1630/LT1631 maintain their performance for supplies
from 2.7V to 36V and are specified at 3V, 5V and ±15V
supplies. The inputs can be driven beyond the supplies
without damage or phase reversal of the output. The output
delivers load currents in excess of 35mA.
Applications
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Active Filters
Rail-to-Rail Buffer Amplifiers
Driving A/D Converters
Low Voltage Signal Processing
Battery-Powered Systems
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and C-Load
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
The LT1630 is available in 8-pin PDIP and SO packages
with the standard dual op amp pinout. The LT1631 features
the standard quad op amp configuration and is available
in a 14-pin plastic SO package. These devices can be used
as plug-in replacements for many standard op amps to
improve input/output range and performance.
Typical Application
Frequency Response
10
Single Supply, 400kHz, 4th Order Butterworth Filter
0
–10
VIN
2.32k
6.65k
220pF
VS/2
–20
47pF
–
1/2 LT1630
+
2.74k
2.74k
GAIN (dB)
2.32k
22pF
5.62k
–
470pF
1/2 LT1630
+
VOUT
–30
–40
–50
–60
–70
1630/31 TA01
–80
–90
0.1k
VS = 3V, 0V
VIN = 2.5VP-P
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1630/31 TA02
16301fa
LT1630/LT1631
Absolute Maximum Ratings
(Note 1)
Total Supply Voltage (V+ to V–)................................ 36V
Input Current........................................................ ±10mA
Output Short-Circuit Duration (Note 2)......... Continuous
Operating Temperature Range
C-Grade/I-Grade.................................. –40°C to 85°C
H-Grade.............................................. –40°C to 125°C
Specified Temperature Range (Note 4)...........................
C-Grade/I-Grade.................................. –40°C to 85°C
H-Grade.............................................. –40°C to 125°C
Junction Temperature .......................................... 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
Pin Configuration
TOP VIEW
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
A
V– 4
N8 PACKAGE
8-LEAD PDIP
B
14 OUT D
OUTA 1
V+
–IN A 2
7
OUT B
+IN A 3
6
–IN B
V+ 4
5
+IN B
+IN B 5
8
–IN B 6
S8 PACKAGE
8-LEAD PLASTIC SO
OUT B 7
TJMAX = 150°C, θJA = 130°C/W (N8)
TJMAX = 150°C, θJA = 190°C/W (S8)
A
D
13 –IN D
12 +IN D
11 V–
B
C
10 +IN C
9
–IN C
8
OUT C
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1630CN8#PBF
LT1630CN8#TRPBF
LT1630CN8
8-Lead PDIP
–40°C to 85°C
LT1630CS8#PBF
LT1630CS8#TRPBF
1630
8-Lead Plastic SO
–40°C to 85°C
LT1630IN8#PBF
LT1630IN8#TRPBF
LT1630IN8
8-Lead PDIP
–40°C to 85°C
LT1630IS8#PBF
LT1630IS8#TRPBF
1630I
8-Lead Plastic SO
–40°C to 85°C
LT1630HS8#PBF
LT1630HS8#TRPBF
1630H
8-Lead Plastic SO
–40°C to 125°C
LT1631CS#PBF
LT1631CS#TRPBF
LT1631CS
14-Lead Plastic SO
–40°C to 85°C
LT1631IS#PBF
LT1631IS#TRPBF
LT1631IS
14-Lead Plastic SO
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
16301fa
LT1630/LT1631
Electrical
Characteristics
otherwise noted.
TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless
SYMBOL
PARAMETER
CONDITIONS
TYP
MAX
UNITS
VOS
Input Offset Voltage
VCM = V+
VCM = V–
150
150
525
525
µV
µV
∆VOS
Input Offset Shift
VCM = V– to V+
150
525
µV
200
950
µV
540
–540
1000
0
nA
nA
1080
2000
nA
25
25
300
300
nA
nA
20
20
150
150
nA
nA
40
300
nA
Input Offset Voltage Match (Channel-to-Channel) VCM
= V–, V+ (Note 5)
IOS
Input Offset Current
∆IOS
Input Offset Current Shift
VCM = V+
VCM = V–
VCM = V– to V+
VCM = V+ (Note 5)
VCM = V– (Note 5)
VCM = V+
VCM = V–
VCM = V– to V+
IB
Input Bias Current
∆IB
Input Bias Current Shift
Input Bias Current Match (Channel-to-Channel)
MIN
0
–1000
Input Noise Voltage
0.1Hz to 10Hz
en
Input Noise Voltage Density
f = 1kHz
6
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.9
pA/√Hz
CIN
Input Capacitance
AVOL
Large-Signal Voltage Gain
VS = 5V, VO = 300mV to 4.7V, RL = 10k
VS = 3V, VO = 300mV to 2.7V, RL = 10k
500
400
3500
2000
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = V– to V+
VS = 3V, VCM = V– to V+
79
75
90
86
dB
dB
CMRR Match (Channel-to-Channel) (Note 5)
VS = 5V, VCM = V– to V+
VS = 3V, VCM = V– to V+
72
67
96
88
dB
dB
Power Supply Rejection Ratio
VS = 2.7V to 12V, VCM = VO = 0.5V
87
105
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = 2.7V to 12V, VCM = VO = 0.5V
80
107
dB
PSRR
300
nVP-P
5
pF
V/mV
V/mV
Minimum Supply Voltage (Note 9)
VCM = VO = 0.5V
2.6
2.7
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 0.5mA
ISINK = 25mA, VS = 5V
ISINK = 20mA, VS = 3V
14
31
600
500
30
60
1200
1000
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 0.5mA
ISOURCE = 20mA, VS = 5V
ISOURCE = 15mA, VS = 3V
15
42
900
680
40
80
1800
1400
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3V
±20
±15
±41
±30
3.5
V
mA
mA
IS
Supply Current per Amplifier
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
15
30
4.4
MHz
mA
SR
Slew Rate (Note 8)
VS = 5V, AV = –1, RL = Open, VO = 4V
VS = 3V, AV = –1, RL = Open
4.6
4.2
9.2
8.5
V/µs
V/µs
tS
Settling Time
VS = 5V, AV = 1, RL = 1k, 0.01%, VSTEP = 2V
520
ns
16301fa
LT1630/LT1631
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range of 0°C < TA < 70°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
VCM = V+ – 0.1V
VCM = V– + 0.2V
VOS TC
Input Offset Voltage Drift (Note 3)
∆VOS
Input Offset Voltage Shift
TYP
MAX
UNITS
l
l
175
175
700
700
µV
µV
VCM = V+ – 0.1V
l
l
2.5
1
5.5
3.5
µV/°C
µV/°C
VCM = V– + 0.2V to V+ – 0.1V
l
175
750
µV
l
200
1200
µV
585
–585
1100
0
nA
nA
l
1170
2200
nA
l
l
25
25
340
340
nA
nA
l
l
20
20
170
170
nA
nA
l
40
340
nA
= V– + 0.2V, V+ – 0.1V (Note 5)
Input Offset Voltage Match (Channel-to-Channel)
VCM
IB
Input Bias Current
∆IB
Input Bias Current Shift
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
VCM = V+ – 0.1V (Note 5)
VCM = V– + 0.2V (Note 5)
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
Input Bias Current Match (Channel-to-Channel)
IOS
Input Offset Current
∆IOS
Input Offset Current Shift
AVOL
Large-Signal Voltage Gain
CMRR
MIN
l
l
0
–1100
VS = 5V, VO = 300mV to 4.7V, RL = 10k
VS = 3V, VO = 300mV to 2.7V, RL = 10k
l
l
450
350
3500
2000
Common Mode Rejection Ratio
VS = 5V, VCM = V– + 0.2V to V+ – 0.1V
VS = 3V, VCM = V– + 0.2V to V+ – 0.1V
l
l
75
71
89
83
dB
dB
CMRR Match (Channel-to-Channel) (Note 5)
VS = 5V, VCM = V– + 0.2V to V+ – 0.1V
VS = 3V, VCM = V– + 0.2V to V+ – 0.1V
l
l
70
65
90
85
dB
dB
Power Supply Rejection Ratio
VS = 3V to 12V, VCM = VO = 0.5V
l
82
101
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = 3V to 12V, VCM = VO = 0.5V
l
78
102
dB
Minimum Supply Voltage (Note 9)
VCM = VO = 0.5V
l
2.6
2.7
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 0.5mA
ISINK = 25mA, VS = 5V
ISINK = 20mA, VS = 3V
l
l
l
l
17
36
700
560
40
80
1400
1200
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 0.5mA
ISOURCE = 15mA, VS = 5V
ISOURCE = 10mA, VS = 3V
l
l
l
l
16
50
820
550
40
100
1600
1100
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3V
l
l
IS
Supply Current per Amplifier
PSRR
±18
±13
±36
±25
4.0
l
V/mV
V/mV
V
mA
mA
5.1
mA
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
l
14
28
MHz
SR
Slew Rate (Note 8)
VS = 5V, AV = –1, RL = Open, VO = 4V
VS = 3V, AV = –1, RL = Open
l
l
4.2
3.9
8.3
7.7
V/µs
V/µs
16301fa
LT1630/LT1631
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range of –40°C < TA < 85°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
VCM = V+ – 0.1V
VCM = V– + 0.2V
VOS TC
Input Offset Voltage Drift (Note 3)
∆VOS
Input Offset Voltage Shift
TYP
MAX
UNITS
l
l
250
250
775
775
µV
µV
VCM = V+ – 0.1V
l
l
2.5
1
5.5
3.5
µV/°C
µV/°C
VCM = V– + 0.2V to V+ – 0.1V
l
200
750
µV
= V– + 0.2V, V+ (Note 5)
l
210
1500
µV
650
–650
1300
0
nA
nA
l
1300
2600
nA
l
l
25
25
390
390
nA
nA
l
l
25
25
195
195
nA
nA
l
50
390
nA
Input Offset Voltage Match (Channel-to-Channel)
VCM
IB
Input Bias Current
∆IB
Input Bias Current Shift
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
VCM = V+ – 0.1V (Note 5)
VCM = V– + 0.2V (Note 5)
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
Input Bias Current Match (Channel-to-Channel)
IOS
Input Offset Current
∆IOS
Input Offset Current Shift
AVOL
Large-Signal Voltage Gain
CMRR
MIN
l
l
0
–1300
VS = 5V, VO = 300mV to 4.7V, RL = 10k
VS = 3V, VO = 300mV to 2.7V, RL = 10k
l
l
400
300
3500
1800
Common Mode Rejection Ratio
VS = 5V, VCM = V– + 0.2V to V+ – 0.1V
VS = 3V, VCM = V– + 0.2V to V+ – 0.1V
l
l
75
71
87
83
dB
dB
CMRR Match (Channel-to-Channel) (Note 5)
VS = 5V, VCM = V– + 0.2V to V+ – 0.1V
VS = 3V, VCM = V– + 0.2V to V+ – 0.1V
l
l
69
65
89
85
dB
dB
Power Supply Rejection Ratio
VS = 3V to 12V, VCM = VO = 0.5V
l
82
98
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = 3V to 12V, VCM = VO = 0.5V
l
78
102
dB
Minimum Supply Voltage (Note 9)
VCM = VO = 0.5V
l
2.6
2.7
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 0.5mA
ISINK = 25mA, VS = 5V
ISINK = 20mA, VS = 3V
l
l
l
l
18
38
730
580
40
80
1500
1200
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 0.5mA
ISOURCE = 15mA, VS = 5V
ISOURCE = 10mA, VS = 3V
l
l
l
l
15
55
860
580
40
110
1700
1200
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3V
l
l
IS
Supply Current per Amplifier
PSRR
±17
±12
±34
±24
4.1
l
V/mV
V/mV
V
mA
mA
5.2
mA
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
l
14
28
MHz
SR
Slew Rate (Note 8)
VS = 5V, AV = –1, RL = Open, VO = 4V
VS = 3V, AV = –1, RL = Open
l
l
3.5
3.3
7
6.5
V/µs
V/µs
16301fa
LT1630/LT1631
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range of –40°C < TA < 125°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
VCM = V+ – 0.1V
VCM = V– + 0.2V
VOS TC
Input Offset Voltage Drift (Note 3)
∆VOS
Input Offset Voltage Shift
TYP
MAX
UNITS
l
l
345
345
950
950
µV
µV
VCM = V+ – 0.1V
l
l
2.5
1
5.5
3.5
µV/°C
µV/°C
VCM = V– + 0.2V to V+ – 0.1V
l
200
750
µV
= V– + 0.2V, V+ (Note 5)
l
210
1500
µV
650
–650
1300
0
nA
nA
l
1300
2600
nA
l
l
25
25
390
390
nA
nA
l
l
25
25
195
195
nA
nA
l
50
390
nA
Input Offset Voltage Match (Channel-to-Channel)
VCM
IB
Input Bias Current
∆IB
Input Bias Current Shift
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
VCM = V+ – 0.1V (Note 5)
VCM = V– + 0.2V (Note 5)
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
Input Bias Current Match (Channel-to-Channel)
IOS
Input Offset Current
∆IOS
Input Offset Current Shift
AVOL
Large-Signal Voltage Gain
CMRR
MIN
l
l
0
–1300
VS = 5V, VO = 300mV to 4.7V, RL = 10k
VS = 3V, VO = 300mV to 2.7V, RL = 10k
l
l
200
150
3100
1625
Common Mode Rejection Ratio
VS = 5V, VCM = V– + 0.2V to V+ – 0.1V
VS = 3V, VCM = V– + 0.2V to V+ – 0.1V
l
l
72
69
87
83
dB
dB
CMRR Match (Channel-to-Channel) (Note 5)
VS = 5V, VCM = V– + 0.2V to V+ – 0.1V
VS = 3V, VCM = V– + 0.2V to V+ – 0.1V
l
l
67
63
89
85
dB
dB
Power Supply Rejection Ratio
VS = 3V to 12V, VCM = VO = 0.5V
l
82
98
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = 3V to 12V, VCM = VO = 0.5V
l
78
102
dB
Minimum Supply Voltage (Note 9)
VCM = VO = 0.5V
l
2.6
2.7
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 0.5mA
ISINK = 25mA, VS = 5V
ISINK = 20mA, VS = 3V
l
l
l
l
18
38
730
580
40
100
1600
1300
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 0.5mA
ISOURCE = 15mA, VS = 5V
ISOURCE = 10mA, VS = 3V
l
l
l
l
15
55
860
580
40
120
1800
1300
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3V
l
l
IS
Supply Current per Amplifier
PSRR
±17
±12
±34
±24
4.1
l
V/mV
V/mV
V
mA
mA
5.6
mA
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
l
13
28
MHz
SR
Slew Rate (Note 8)
VS = 5V, AV = –1, RL = Open, VO = 4V
VS = 3V, AV = –1, RL = Open
l
l
3.5
3.3
7
6.5
V/µs
V/µs
16301fa
LT1630/LT1631
Electrical
Characteristics
SYMBOL
TA = 25°C, VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
PARAMETER
CONDITIONS
Input Offset Voltage
IOS
Input Offset Current
∆IOS
Input Offset Current Shift
VCM = V+
VCM = V–
VCM = V– to V+
VCM = V–, V+ (Note 5)
VCM = V+
VCM = V–
VCM = V– to V+
VCM = V+ (Note 5)
VCM = V– (Note 5)
VCM = V+
VCM = V–
VCM = V– to V+
VOS
∆VOS
Input Offset Voltage Shift
Input Offset Voltage Match (Channel-to-Channel)
IB
Input Bias Current
∆IB
Input Bias Current Shift
Input Bias Current Match (Channel-to-Channel)
MIN
0
–1100
TYP
MAX
UNITS
220
220
1000
1000
µV
µV
150
1000
µV
200
1500
µV
550
–550
1100
0
nA
nA
1100
2200
nA
20
20
300
300
nA
nA
20
20
150
150
nA
nA
40
300
nA
Input Noise Voltage
0.1Hz to 10Hz
en
Input Noise Voltage Density
f = 1kHz
300
6
nV/√Hz
nVP-P
in
Input Noise Current Density
f = 1kHz
0.9
pA/√Hz
CIN
Input Capacitance
f = 100kHz
AVOL
Large-Signal Voltage Gain
VO = –14.5V to 14.5V, RL = 10k
VO = –10V to 10V, RL = 2k
1000
650
5000
3500
V/mV
V/mV
Channel Separation
VO = –10V to 10V, RL = 2k
3
pF
112
134
dB
VCM
= V– to V+
89
106
dB
CMRR Match (Channel-to-Channel) (Note 5)
VCM
= V– to V+
86
110
dB
Power Supply Rejection Ratio
VS = ±5V to ±15V
87
105
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = ±5V to ±15V
82
107
dB
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 5mA
ISINK = 25mA
16
150
600
35
300
1200
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISINK = 5mA
ISINK = 25mA
15
250
1200
40
500
2400
mV
mV
mV
CMRR
PSRR
Common Mode Rejection Ratio
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
±35
±70
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
15
30
MHz
SR
Slew Rate
AV = –1, RL = Open, VO = ±10V,
Measure at VO = ±5V
5
10
V/µs
tS
Settling Time
0.01%, VSTEP = 10V, AV = 1, RL = 1k
1.2
µs
4.1
mA
5.0
mA
16301fa
LT1630/LT1631
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range of 0°C < TA < 70°C. VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
VCM = V+ – 0.1V
VCM = V– + 0.2V
VOS TC
Input Offset Voltage Drift (Note 3)
∆VOS
Input Offset Voltage Shift
TYP
MAX
UNITS
l
l
300
300
1250
1250
µV
µV
VCM = V+ – 0.1V
l
l
4.5
1.5
7
4
VCM = V– + 0.2V to V+ – 0.1V
l
180
1100
µV
l
300
2000
µV
600
–600
1200
0
nA
nA
l
1200
2400
nA
l
l
30
30
350
350
nA
nA
l
l
25
25
175
175
nA
nA
l
50
350
nA
= V– + 0.2V, V+ – 0.1V (Note 5)
Input Offset Voltage Match (Channel-to-Channel)
VCM
IB
Input Bias Current
∆IB
Input Bias Current Shift
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
VCM = V+ – 0.1V (Note 5)
VCM = V– + 0.2V (Note 5)
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
Input Bias Current Match (Channel-to-Channel)
IOS
Input Offset Current
∆IOS
Input Offset Current Shift
AVOL
Large-Signal Voltage Gain
CMRR
MIN
l
l
0
–1200
VO = –14.5V to 14.5V, RL = 10k
VO = –10V to 10V, RL = 2k
l
l
900
600
Channel Separation
VO = –10V to 10V, RL = 2k
l
Common Mode Rejection Ratio
VCM = V– + 0.2V to V+ – 0.1V
l
= V– + 0.2V to V+ – 0.1V
µV/°C
µV/°C
6000
4000
V/mV
V/mV
112
132
dB
88
104
dB
CMRR Match (Channel-to-Channel) (Note 5)
VCM
l
84
104
dB
Power Supply Rejection Ratio
VS = ±5V to ±15V
l
86
100
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = ±5V to ±15V
l
80
104
dB
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 5mA
ISINK = 25mA
l
l
l
19
175
670
45
350
1400
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 5mA
ISOURCE = 25mA
l
l
l
15
300
1400
40
600
2800
mV
mV
mV
ISC
Short-Circuit Current
l
IS
Supply Current per Amplifier
l
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
l
14
28
MHz
SR
Slew Rate
AV = –1, RL = Open, VO = ±10V,
Measured at VO = ±5V
l
4.5
9
V/µs
PSRR
±28
±57
4.6
mA
5.6
mA
16301fa
LT1630/LT1631
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range of –40°C < TA < 85°C. VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
VCM = V+ – 0.1V
VCM = V– + 0.2V
VOS TC
Input Offset Voltage Drift (Note 3)
∆VOS
Input Offset Voltage Shift
TYP
MAX
UNITS
l
l
350
350
1400
1400
µV
µV
VCM = V+ – 0.1V
l
l
4.5
1.5
7
4
VCM = V– + 0.2V to V+ – 0.1V
l
180
1200
µV
l
350
2200
µV
690
–690
1400
0
nA
nA
l
1380
2800
nA
l
l
30
30
420
420
nA
nA
l
l
30
30
210
210
nA
nA
l
60
420
nA
= V– + 0.2V, V+ – 0.1V (Note 5)
Input Offset Voltage Match (Channel-to-Channel)
VCM
IB
Input Bias Current
∆IB
Input Bias Current Shift
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
VCM = V+ – 0.1V (Note 5)
VCM = V– + 0.2V (Note 5)
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
Input Bias Current Match (Channel-to-Channel)
IOS
Input Offset Current
∆IOS
Input Offset Current Shift
AVOL
Large-Signal Voltage Gain
CMRR
MIN
l
l
0
–1400
VO = –14.5V to 14.5V, RL = 10k
VO = –10V to 10V, RL = 2k
l
l
700
400
Channel Separation
VO = –10V to 10V, RL = 2k
l
Common Mode Rejection Ratio
VCM = V– + 0.2V to V+ – 0.1V
l
= V– + 0.2V to V+ – 0.1V
µV/°C
µV/°C
6000
4000
V/mV
V/mV
112
132
dB
87
104
dB
CMRR Match (Channel-to-Channel) (Note 5)
VCM
l
84
104
dB
Power Supply Rejection Ratio
VS = ±5V to ±15V
l
84
100
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = ±5V to ±15V
l
80
100
dB
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 5mA
ISINK = 25mA
l
l
l
22
180
700
50
350
1400
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 5mA
ISOURCE = 25mA
l
l
l
15
300
1500
40
600
3000
mV
mV
mV
ISC
Short-Circuit Current
l
IS
Supply Current per Amplifier
l
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
l
14
27
MHz
SR
Slew Rate
AV = –1, RL = Open, VO = ±10V,
Measured at VO = ±5V
l
4.2
8.5
V/µs
PSRR
±27
±54
4.8
mA
5.9
mA
16301fa
LT1630/LT1631
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range of –40°C < TA < 125°C. VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
VCM = V+ – 0.1V
VCM = V– + 0.2V
VOS TC
Input Offset Voltage Drift (Note 3)
∆VOS
Input Offset Voltage Shift
MIN
TYP
MAX
UNITS
l
l
525
525
1600
1600
µV
µV
VCM = V+ – 0.1V
l
l
4.5
1.5
7
4
VCM = V– + 0.2V to V+ – 0.1V
l
220
1300
µV
l
350
2200
µV
750
–750
1500
0
nA
nA
l
1380
2800
nA
l
l
42
42
460
460
nA
nA
l
l
30
30
210
210
nA
nA
l
60
420
nA
= V– + 0.2V, V+ – 0.1V (Note 5)
Input Offset Voltage Match (Channel-to-Channel)
VCM
IB
Input Bias Current
∆IB
Input Bias Current Shift
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
VCM = V+ – 0.1V (Note 5)
VCM = V– + 0.2V (Note 5)
VCM = V+ – 0.1V
VCM = V– + 0.2V
VCM = V– + 0.2V to V+ – 0.1V
Input Bias Current Match (Channel-to-Channel)
IOS
Input Offset Current
∆IOS
Input Offset Current Shift
AVOL
Large-Signal Voltage Gain
CMRR
l
l
0
–1500
VO = –14.5V to 14.5V, RL = 10k
VO = –10V to 10V, RL = 2k
l
l
700
400
Channel Separation
VO = –10V to 10V, RL = 2k
l
Common Mode Rejection Ratio
VCM = V– + 0.2V to V+ – 0.1V
l
= V– + 0.2V to V+ – 0.1V
µV/°C
µV/°C
6000
4000
V/mV
V/mV
112
132
dB
87
104
dB
CMRR Match (Channel-to-Channel) (Note 5)
VCM
l
84
104
dB
Power Supply Rejection Ratio
VS = ±5V to ±15V
l
84
100
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = ±5V to ±15V
l
80
100
dB
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 5mA
ISINK = 25mA
l
l
l
22
180
700
60
400
1500
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 5mA
ISOURCE = 25mA
l
l
l
15
300
1500
50
675
3300
mV
mV
mV
ISC
Short-Circuit Current
l
IS
Supply Current per Amplifier
l
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
l
13
27
MHz
SR
Slew Rate
AV = –1, RL = Open, VO = ±10V,
Measured at VO = ±5V
l
4.2
8.5
V/µs
PSRR
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 the absolute maximum rating when the output is shorted
indefinitely.
Note 3: This parameter is not 100% tested.
Note 4: The LT1630C/LT1631C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1630C/LT1631C and are designed,
characterized and expected to meet specified performance from –40°C
to 85°C but are not tested or QA sampled at these temperatures. The
LT1630I/LT1631I are guaranteed to meet specified performance from
–40°C to 85°C. The LT1630H is guaranteed to meet specified performance
from –40°C to 125°C.
±27
±54
4.8
mA
6.4
mA
Note 5: Matching parameters are the difference between amplifiers A and
D and between B and C on the LT1631; between the two amplifiers on the
LT1630.
Note 6: Output voltage swings are measured between the output and
power supply rails.
Note 7: VS = 3V, VS = ±15V GBW limit guaranteed by correlation to
5V tests.
Note 8: VS = 3V, VS = 5V slew rate limit guaranteed by correlation to
±15V tests.
Note 9: Minimum supply voltage is guaranteed by testing the change of
VOS to be less than 250µV when the supply voltage is varied from 3V to
2.7V.
16301fa
10
LT1630/LT1631
Typical Performance Characteristics
VOS Distribution, VCM = 0V
(PNP Stage)
VOS Distribution, VCM = 5V
(NPN Stage)
50
50
VS = 5V, 0V
VCM = 0V
VS = 5V, 0V
VCM = 5V
30
20
10
40
30
20
–300
100
300
–100
INPUT OFFSET VOLTAGE (µV)
0
–500
500
–300
100
300
–100
INPUT OFFSET VOLTAGE (µV)
600
TA = 25°C
4.0
3.5
3.0
TA = –55°C
2.5
2.0
0
4
8 12 16 20 24 28
TOTAL SUPPLY VOTAGE (V)
4.5
4.0
3.5
VS = 5V, 0V
3.0
2.5
2.0
1630/31 G01
–0.6
–0.8
TA = 125°C
–600
TA = 25°C
100 125
–1000
VS = 5V, 0V
VCM = 5V
VS = ±15V
VCM = 15V
VS = ±15V
VCM = –15V
1630/31 G04
–2
–1
0
2
3
4
5
1
COMMON MODE VOLTAGE (V)
6
Output Saturation Voltage
vs Load Current (Output High)
10
VS = 5V, 0V
1
TA = 125°C
0.1
TA = 25°C
TA = –55°C
VS = 5V, 0V
VCM = 0V
–1.0
–50 –35 –20 –5 10 25 40 55 70 85 100
TEMPERATURE (°C)
TA = –55°C
1630/31 G03
VS = 5V, 0V
SATURATION VOLTAGE (V)
INPUT BIAS CURRENT (µA)
–0.4
–400
10
0
–0.2
–200
Output Saturation Voltage
vs Load Current (Output Low)
1.0
0.2
0
1630/31 G02
Input Bias Current vs Temperature
0.4
200
–800
1.5
1.0
25 50 75
–75 –50 –25 0
TEMPERATURE (°C)
32 36
VS = 5V, 0V
400
SATURATION VOLTAGE (V)
4.5
VS = ±15V
INPUT BIAS CURRENT (nA)
SUPPLY CURRENT PER AMPLIFIER (mA)
SUPPLY CURRENT PER AMPLIFIER (mA)
TA = 125°C
500
Input Bias Current
vs Common Mode Voltage
5.0
5.0
–300
100
300
–100
INPUT OFFSET VOLTAGE (µV)
1630/31 G34
Supply Current vs Temperature
5.5
0.6
0
–500
500
1630/31 G33
Supply Current vs Supply Voltage
0.8
20
10
1630/31 G32
1.5
30
10
0
–500
∆VOS Shift for VCM = 0V to 5V
VS = 5V, 0V
PERCENT OF UNITS (%)
40
PERCENT OF UNITS (%)
PERCENT OF UNITS (%)
40
50
0.01
0.01
0.1
1
10
LOAD CURRENT (mA)
100
1630/31 G05
1
TA = 125°C
0.1
TA = 25°C
TA = –55°C
0.01
0.01
0.1
1
10
LOAD CURRENT (mA)
100
1630/31 G06
16301fa
11
LT1630/LT1631
Typical Performance Characteristics
Minimum Supply Voltage
Noise Voltage Spectrum
35
Current Noise Spectrum
VS = 5V, 0V
200
150
TA = 25°C
TA = 125°C
TA = –55°C
20
15
10
50
5
0
0
1
4
2
3
TOTAL SUPPLY VOLTAGE (V)
5
VCM = 4.25V
NPN ACTIVE
8
7
6
5
4
2
10
100
FREQUENCY (Hz)
1
0
VCM = 2.5V
PNP ACTIVE
1000
1
10
100
FREQUENCY (Hz)
1630/31 G10
Gain Bandwidth and Phase
Margin vs Supply Voltage
Gain and Phase vs Frequency
VS =5V, 0V
VCM = VS/2
80
180
50
70
135
45
60
90
40
VOLTAGE GAIN (dB)
40
0
30
–45
GAIN
20
–90
10
–135
–10
–20
0.01
1630/31 G25
1
10
FREQUENCY (MHz)
90
80
35
70
GAIN BANDWIDTH
30
50
PHASE MARGIN
20
30
20
–225
5
10
–270
100
0
0
5
90
VS = ±15V
90
80
70
VS = 5V, 0V
60
50
40
30
20
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1630/31 G12
Channel Separation vs Frequency
VS = ±15V
80
POSITIVE SUPPLY
70
60
50
NEGATIVE SUPPLY
40
30
20
10
0
–40
–50
CHANNEL SEPARATION (dB)
110
0
30
15
20
25
10
TOTAL SUPPLY VOLTAGE (V)
1630/31 G14
PSRR vs Frequency
100
POWER SUPPLY REJECTION RATIO (dB)
COMMON MODE REJECTION RATIO (dB)
CMRR vs Frequency
40
10
1630/31 G11
120
60
25
15
–180
RL = 1k
VS = 3V, 0V
VS = ±15V
0.1
PHASE SHIFT (DEG)
45
100
VCM = VS/2
PHASE MARGIN (DEG)
PHASE
50
0
100
1000
11630/31 G09
0.1Hz to 10Hz Output
Voltage Noise
TIME (1s/DIV)
VCM = 4.25V
NPN ACTIVE
3
1
GAIN BANDWIDTH (MHz)
100
VCM = 2.5V
PNP ACTIVE
25
VS = 5V, 0V
9
CURRENT NOISE (pA/√Hz)
250
1630/31 G07
OUTPUT VOLTAGE (200nV/DIV)
10
30
NOISE VOLTAGE (nV/√Hz)
CHANGE IN OFFSET VOLTAGE (µV)
300
–60
–70
–80
–90
–100
–110
–120
–130
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1630/31 G13
–140
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
1630/31 G15
16301fa
12
LT1630/LT1631
Typical Performance Characteristics
Capacitive Load Handling
60
30
20
10
6
RISING EDGE
12
11
FALLING EDGE
10
10
100
CAPACITIVE LOAD (pF)
8
1000
0
8
12 16 20 24 28
TOTAL SUPPLY VOLTAGE (V)
4
RL = 10k
–5
–10
–15
–20
0
5
–20 –15 –10 –5
10
OUTPUT VOLTAGE (V)
15
2
RL = 1k
–2
LT1631CS
VS = ±15V
–160
0
20
–50
–6
–150
0
1
2
4
3
OUTPUT VOLTAGE (V)
5
40 60 80 100 120 140 160
TIME AFTER POWER-UP (SEC)
1630/31 G22
VS = ±15V
RL = 100Ω
0
–100
–200
6
–5 –4 –3 –2 –1 0 1 2 3 4
OUTPUT VOLTAGE (V)
VS = 5V, 0V
AV = –1
2
0.01
0.001
1
0
1
10
100
FREQUENCY (kHz)
7
VIN = 2VP-P
RL = 10k
0.1
VS = 5V, 0V
AV = 1
3
6
Total Harmonic Distortion + Noise
vs Frequency
1
4
5
1630/31 G21
THD + NOISE (%)
S8 PACKAGE
VS = ±15V
–120
–200
N8 PACKAGE
VS = ±15V
1.50
50
Maximum Undistorted Output
Signal vs Frequency
OUTPUT VOLTAGE SWING (VP-P)
CHANGE IN OFFSET VOLTAGE (µV)
–80
1.25
1.00
0.50 0.75
SETTLING TIME (µs)
100
–4
5
LT1631CS
VS = 5V, 0V
0.25
1630/31 G20
40
–40
0
150
RL = 10k
0
Warm-Up Drift vs Time
0
INVERTING
1630/31 G18
VS = 5V, 0V
4
–8
20
N8 PACKAGE
VS = 5V, 0V
NONINVERTING
Open-Loop Gain
1630/31 G19
S8 PACKAGE
VS = 5V, 0V
–4
–10
32
INPUT VOLTAGE (µV)
INPUT VOLTAGE (µV)
INPUT VOLTAGE (µV)
RL = 1k
0
–2
200
6
5
0
Open-Loop Gain
8
VS = ±15V
10
2
1630/31 G17
Open-Loop Gain
15
INVERTING
–8
1630/31 G16
20
NONINVERTING
4
–6
9
1
VS = ±15V
8
OUTPUT STEP (V)
SLEW RATE (V/µs)
OVERSHOOT (%)
VOUT = 80% OF VS
AV = –1
13
40
0
10
14
VS = 5V, 0V
AV = 1
RL = 1k
50
Output Step vs
Settling Time to 0.01%
Slew Rate vs Supply Voltage
1000
1630/31 G24
0.0001
0.1
VS = 3V, 0V
AV = 1
VS = 5V, 0V AND 3V, 0V
AV = –1
VS = 5V, 0V
AV = 1
10
1
FREQUENCY (kHz)
100
163031 G23
16301fa
13
LT1630/LT1631
Typical Performance Characteristics
Harmonic Distortion vs Frequency
HARMONIC DISTORTION (dBc)
0
5V Small-Signal Response
5V Large-Signal Response
VS = 5V, 0V
AV = 1
VIN = 2VP-P
RL = 150Ω
RL = 1k
–20
–40
2ND
–60
3RD
2ND
–80
–100
100
163031 G26
VS = 5V, 0V
AV = 1
RL = 1k
3RD
VS = 5V, 0V
AV = 1
RL = 1k
163031 G27
1000
200
500
FREQUENCY (kHz)
1630/31 G30
Harmonic Distortion vs Frequency
HARMONIC DISTORTION (dBc)
0
–20
±15V Small-Signal Response
±15V Large-Signal Response
VS = 5V, 0V
AV = –1
VIN = 2VP-P
RL = 150Ω
RL = 1k
–40
–60
2ND
3RD
–80
2ND
VS = ±15V
AV = 1
RL = 1k
3RD
–100
100
200
500
FREQUENCY (kHz)
1000
163031 G28
VS = ±15V
AV = 1
RL = 1k
163031 G29
1630/31 G31
Applications Information
Rail-to-Rail Input and Output
The LT1630/LT1631 are fully functional for an input and
output signal range from the negative supply to the positive supply. Figure 1 shows a simplified schematic of the
amplifier. The input stage consists of two differential amplifiers, a PNP stage Q1/Q2 and an NPN stage Q3/Q4 that
are active over different ranges of input common mode
voltage. The PNP differential input pair is active for input
common mode voltages VCM between the negative supply
to approximately 1.4V below the positive supply. As VCM
moves closer toward the positive supply, the transis-
tor Q5 will steer the tail current I1 to the current mirror
Q6/Q7, activating the NPN differential pair and the PNP
pair becomes inactive for the rest of the input common
mode range up to the positive supply.
The output is configured with a pair of complementary
common emitter stages Q14/Q15 that enables the output
to swing from rail to rail. These devices are fabricated on
Linear Technology’s proprietary complementary bipolar
process to ensure similar DC and AC characteristics. Capacitors C1 and C2 form local feedback loops that lower
the output impedance at high frequencies.
16301fa
14
LT1630/LT1631
Applications Information
V+
R3
+
+IN
–IN
R6
225Ω
R7
225Ω
I1
D1
D5
Q5
D2
D6
R4
Q12
Q11
R5
+
VBIAS
I2
V–
Q4
Q3
Q9
D4
V
C2
CC
OUT
Q2
Q1
D3
Q7
Q15
Q13
Q8
BUFFER
AND
OUTPUT BIAS
C1
Q6
–
R1
R2
Q14
1630/31 F01
Figure 1. LT1630 Simplified Schematic Diagram
Power Dissipation
The LT1630/LT1631 amplifiers combine high speed and
large output current drive in a small package. Because
the amplifiers operate over a very wide supply range, it
is possible to exceed the maximum junction temperature
of 150°C in plastic packages under certain conditions.
Junction temperature, TJ, is calculated from the ambient
temperature, TA, and power dissipation, PD, as follows:
LT1630CN8: TJ = TA + (PD • 130°C/W)
LT1630CS8: TJ = TA + (PD • 190°C/W)
LT1631CS: TJ = TA + (PD • 150°C/W)
The power dissipation in the IC is the function of the
supply voltage, output voltage and load resistance. For
a given supply voltage, the worst-case power dissipation
PDMAX occurs at the maximum supply current and when
the output voltage is at half of either supply voltage (or the
maximum swing if less than 1/2 supply voltage). Therefore
PDMAX is given by:
PDMAX = (VS • ISMAX) + (VS/2)2/RL
To ensure that the LT1630/LT1631 are used properly,
calculate the worst-case power dissipation, get the thermal resistance for a chosen package and its maximum
junction temperature to derive the maximum ambient
temperature.
Example: An LT1630CS8 operating on ±15V supplies and
driving a 500Ω, the worst-case power dissipation per
amplifier is given by:
PDMAX = (30V • 4.75mA) + (15V – 7.5V)(7.5/500)
= 0.143 + 0.113 = 0.256W
If both amplifiers are loaded simultaneously, then the
total power dissipation is 0.512W. The SO-8 package has
a junction-to-ambient thermal resistance of 190°C/W in
still air. Therefore, the maximum ambient temperature that
the part is allowed to operate is:
TA = TJ – (PDMAX • 190°C/W)
TA = 150°C – (0.512W • 190°C/W) = 53°C
For a higher operating temperature, lower the supply
voltage or use the DIP package part.
16301fa
15
LT1630/LT1631
Applications Information
Input Offset Voltage
The offset voltage changes depending upon which input
stage is active, and the maximum offset voltages are
trimmed to less than 525µV. To maintain the precision
characteristics of the amplifier, the change of VOS over the
entire input common mode range (CMRR) is guaranteed
to be less than 525µV on a single 5V supply.
Input Bias Current
The input bias current polarity depends on the input
common mode voltage. When the PNP differential pair is
active, the input bias currents flow out of the input pins.
They flow in the opposite direction when the NPN input
stage is active. The offset voltage error due to input bias
currents can be minimized by equalizing the noninverting
and inverting input source impedance.
Output
The outputs of the LT1630/LT1631 can deliver large load
currents; the short-circuit current limit is 70mA. Take care to
keep the junction temperature of the IC below the absolute
maximum rating of 150°C (refer to the Power Dissipation
section). The output of these amplifiers have reverse-biased
diodes to each supply. If the output is forced beyond either
supply, unlimited current will flow through these diodes.
If the current is transient and limited to several hundred
mA, no damage to the part will occur.
Overdrive Protection
To prevent the output from reversing polarity when the
input voltage exceeds the power supplies, two pairs of
crossing diodes D1 to D4 are employed. When the input
voltage exceeds either power supply by approximately
700mV, D1/D2 or D3/D4 will turn on, forcing the output
to the proper polarity. For this phase reversal protection
to work properly, the input current must be limited to less
than 5mA. If the amplifier is to be severely overdriven,
an external resistor should be used to limit the overdrive
current.
The LT1630/LT1631’s input stages are protected against
large differential input voltages by a pair of back-to-back
diodes D5/D6. When a differential voltage of more than
0.7V is applied to the inputs, these diodes will turn on,
preventing the emitter-base breakdown of the input transistors. The current in D5/D6 should be limited to less than
10mA. Internal 225Ω resistors R6 and R7 will limit the
input current for differential input signals of 4.5V or less.
For larger input levels, a resistor in series with either or
both inputs should be used to limit the current. Worst-case
differential input voltage usually occurs when the output is
shorted to ground. In addition, the amplifier is protected
against ESD strikes up to 3kV on all pins.
Capacitive Load
The LT1630/LT1631 are wideband amplifiers that can
drive capacitive loads up to 200pF on ±15V supplies in a
unity-gain configuration. On a 3V supply, the capacitive
load should be kept to less than 100pF. When there is a
need to drive larger capacitive loads, a resistor of 20Ω
to 50Ω should be connected between the output and the
capacitive load. The feedback should still be taken from
the output so that the resistor isolates the capacitive load
to ensure stability.
Feedback Components
The low input bias currents of the LT1630/LT1631 make it
possible to use the high value feedback resistors to set the
gain. However, care must be taken to ensure that the pole
formed by the feedback resistors and the total capacitance at
the inverting input does not degrade stability. For instance,
the LT1630/LT1631 in a noninverting gain of 2, set with
two 20k resistors, will probably oscillate with 10pF total
input capacitance (5pF input capacitance and 5pF board
capacitance). The amplifier has a 5MHz crossing frequency
and a 52° phase margin at 6dB of gain. The feedback
resistors and the total input capacitance form a pole at
1.6MHz that induces a phase shift of 72° at 5MHz! The
solution is simple: either lower the value of the resistors
or add a feedback capacitor of 10pF or more.
16301fa
16
LT1630/LT1631
TYPICAL APPLICATIONS
Single Supply, 40dB Gain, 350kHz
Instrumentation Amplifier
Tunable Q Notch Filter
An instrumentation amplifier with a rail-to-rail output swing,
operating from a 3V supply can be constructed with the
LT1630 as shown in Figure 2. The amplifier has a nominal
gain of 100, which can be adjusted with resistor R5. The
DC output level is set by the difference of the two inputs
multiplied by the gain of 100. Common mode range can
be calculated by the equations shown with Figure 2. For
example, the common mode range is from 0.15V to 2.65V
if the output is set at one half of the 3V supply. The common mode rejection is greater than 110dB at 100Hz when
trimmed with resistor R1. The amplifier has a bandwidth
of 355kHz as shown in Figure 3.
R5
432Ω
R2
2k
A single supply, tunable Q notch filter as shown in Figure 4
is built with LT1630 to maximize the output swing. The
filter has a gain of 2, and the notch frequency (fO) is set
by the values of R and C. The resistors R10 and R11 set
up the DC level at the output. The Q factor can be adjusted
by varying the value of R8. The higher value of R8 will
decrease Q as depicted in Figure 5, because the output
induces less of feedback to amplifier A2. The value of R7
should be equal or greater than R9 to prevent oscillation.
If R8 is a short and R9 is larger than R7, then the positive
feedback from the output will create phase inversion at the
output of amplifier A2, which will lead to oscillation.
R4
20k
–
OUT1
1/2 LT1630
R3
2k
+
VIN–
–
+
VOUT
AV =
VOUT = (
VIN+
– VIN
–
) • AV
1.0
V R2
+ 0.1V
VCML = OUT
1.1
A V R5
UPPER LIMIT COMMO
ON MODE INPUT VOLTAGE
1.0
V R2
+ ( VS – 0.15V )
VCMH = OUT
1.1
A V R5
RRENT
WHERE VS IS THE SUPPLY CUR
R10
10k
C2
4.7µF
+
R11
10k
R8
5k
fO = 98kHz
fO =
1
2πRC
VO(DC) =
R7
1k
1630/31 F04
(5V )(R11) = 2.5V
R11+ R10
AV = 2
Figure 4. Tunable Q Notch Filter
Figure 2. Single Supply, 40dB Gain Instrumentation Amplifier
50
40
40
DIFFERENTIAL INPUT
30
20
GAIN (VOUT/VIN)(dB)
VOLTAGE GAIN (dB)
R6
R5
1k
1k
C5
4.7µF
R9
1k
VOUT
–
A2
1/2 LT1630
5V
LOWER LIMIT COMMON MODE INPUT VOLTAGE
R4 R2 R3 + R2
1+ +
= 100
R3 R1
R5
A1
1/2 LT1630
–
1630/31 F02
BW = 355kHz
+
R
1.62k
R
R1
1.62k
500Ω
C
R2
1k 1000pF
1/2 LT1630
VIN+
5V
VIN
VS
R1
20k
C
1000pF
C1
2.2µF
10
0
COMMON MODE INPUT
–10
–20
–30
20
INCREASING R8
0
–20
DECREASING R8
–40
–50
VS = 3V
AV = 100
–60
–70
100
1k
10k
100k
FREQUENCY (Hz)
10M
1M
–40
0
20 40 60 80 100 120 140 160 180 200
FREQUENCY (kHz)
13630/31 F05
1630/31 F03
Figure 3. Frequency Response
Figure 5. Frequency Response
16301fa
17
LT1630/LT1631
Package Description
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
+.035
.325 –.015
+0.889
8.255
–0.381
.400*
(10.160)
MAX
.130 p .005
(3.302 p 0.127)
8
7
6
5
1
2
3
4
.255 p .015*
(6.477 p 0.381)
.120
(3.048) .020
MIN (0.508)
MIN
.018 p .003
.100
(2.54)
BSC
N8 1002
(0.457 p 0.076)
NOTE:
1. DIMENSIONS ARE
INCHES
MILLIMETERS
*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
.010 – .020
s 45o
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
5
.050 BSC
INCHES
(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)
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
1. DIMENSIONS IN
6
.045 p.005
.004 – .010
(0.101 – 0.254)
0o– 8o TYP
.016 – .050
(0.406 – 1.270)
7
8
.053 – .069
(1.346 – 1.752)
.245
MIN
.160 p.005
SO8 0303
1
3
2
4
.030 p.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.337 – .344
(8.560 – 8.738)
NOTE 3
.045 p.005
.050 BSC
14
N
12
11
10
9
8
N
.245
MIN
.160 p.005
.228 – .244
(5.791 – 6.197)
1
.030 p.005
TYP
13
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
s 45o
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
1
2
3
4
5
7
.004 – .010
(0.101 – 0.254)
.053 – .069
(1.346 – 1.752)
NOTE:
1. DIMENSIONS IN
0o – 8o TYP
.016 – .050
(0.406 – 1.270)
6
.150 – .157
(3.810 – 3.988)
NOTE 3
.014 – .019
(0.355 – 0.483)
TYP
.050
(1.270)
BSC
INCHES
(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)
S14 0502
16301fa
18
LT1630/LT1631
Revision History
REV
DATE
A
2/2010
DESCRIPTION
PAGE NUMBER
Changes to Absolute Maximum Ratings
2
Updated Order Information Section
2
Added H Grade Part
Added H Grade Electrical Characteristics Tables
2
6, 10
16301fa
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
19
LT1630/LT1631
Typical Application
RF Amplifier Control Biasing and DC Restoration
Taking advantage of the rail-to-rail input and output, and
the large output current capability of the LT1630, the
circuit, shown in Figure 6, provides precise bias currents
for the RF amplifiers and restores DC output level. To
ensure optimum performance of an RF amplifier, its bias
point must be accurate and stable over the operating
temperature range. The op amp A1 combined with Q1,
Q2, R1, R2 and R3 establishes two current sources of
21.5mA to bias RF1 and RF2 amplifiers. The current of
Q1 is determined by the voltage across R2 over R1, which
is replicated in Q2. These current sources are stable and
precise over temperature and have a low dissipated power
due to a low voltage drop between their terminals. The
amplifier A2 is used to restore the DC level at the output.
With a large output current of the LT1630, the output can
be set at 1.5VDC on 5V supply and 50Ω load. This circuit
has a 3dB bandwidth from 2MHz to 2GHz and a power
gain of 25dB.
5V
R2
453W
–
5V
Q1
2N3906
A1
1/2 LT1630
C1
0.01µF
+
R4
10Ω
R1
10Ω
Q2
2N3906
+
+
R3
10k
L1
220µH
C2
1500pF
VIN
HP-MSA0785
C3
1500pF
+
C5
0.01µF
HP-MSA0785
C4
1500pF
RF2
RF1
C6
0.01µF
L2
220µH
L3
3.9µH
VOUT
L4
3.9µH
+
R5
50Ω
A2
1/2 LT1630
1630/31 F06
–
Figure 6. RF Amplifier Control Biasing and DC Restoration
Related Parts
PART NUMBER
DESCRIPTON
COMMENTS
LT1211/LT1212
Dual/Quad 14MHz, 7V/µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 275µV VOS(MAX),
6µV/°C Max Drift, Max Supply Current 1.8mA per Op Amp
LT1213/LT1214
Dual/Quad 28MHz, 12V/µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 275µV VOS(MAX),
6µV/°C Max Drift, Max Supply Current 3.5mA per Op Amp
LT1215/LT1216
Dual/Quad 23MHz, 50V/µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 450µV VOS(MAX),
6µV/°C Max Drift, Max Supply Current 6.6mA per Op Amp
LT1498/LT1499
Dual/Quad 10MHz, 6V/µs Rail-to-Rail Input and Output
C-Load™ Op Amps
High DC Accuracy, 475µV VOS(MAX), 4µV/°C Max Drift,
Max Supply Current 2.2mA per Amp
LT1632/LT1633
Dual/Quad 45MHz, 45V/µs Rail-to-Rail Input and Output Op Amps High DC Accuracy, 1.35mV VOS(MAX), 70mA Output Current,
Max Supply Current 5.2mA per Amp
16301fa
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
LT 0210 REV A • PRINTED IN USA
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