LINER LT1630

LT1630/LT1631
30MHz, 10V/µs, Dual/Quad
Rail-to-Rail Input and Output
Precision Op Amps
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FEATURES
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DESCRIPTION
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.
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 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.
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APPLICATIONS
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Active Filters
Rail-to-Rail Buffer Amplifiers
Driving A/D Converters
Low Voltage Signal Processing
Battery-Powered Systems
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
Frequency Response
10
Single Supply, 400kHz, 4th Order Butterworth Filter
0
–10
2.32k
2.32k
6.65k
VIN
47pF
–
2.74k
2.74k
220pF
–
470pF
1/2 LT1630
1/2 LT1630
+
22pF
5.62k
+
VS/2
GAIN (dB)
–20
–30
–40
–50
–60
VOUT
–70
–80
1630/31 TA01
–90
0.1k
VS = 3V, 0V
VIN = 2.5VP-P
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1630/31 TA02
1
LT1630/LT1631
W W
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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 ............... – 40°C to 85°C
Specified Temperature Range (Note 4) ... – 40°C to 85°C
Junction Temperature .......................................... 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
OUT A 1
8
V+
– IN A 2
7
OUT B
6
– IN B
5
+ IN B
A
+ IN A 3
V
–
B
4
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
LT1630CN8
LT1630CS8
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
1630
14 OUT D
OUTA 1
– IN A 2
+ IN A 3
A
D
V+ 4
+ IN B 5
S8 PART MARKING
ORDER PART
NUMBER
TOP VIEW
13 – IN D
LT1631CS
12 + IN D
11 V –
B
C
10 + IN C
– IN B 6
9
– IN C
OUT B 7
8
OUT C
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/ W
Consult factory for Military and Industrial grade parts.
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
TYP
MAX
UNITS
VOS
Input Offset Voltage
VCM = V +
VCM = V –
MIN
150
150
525
525
µV
µV
∆VOS
Input Offset Shift
VCM = V – to V +
150
525
µV
200
950
µV
IB
Input Offset Voltage Match (Channel-to-Channel) VCM = V –, V + (Note 5)
Input Bias Current
VCM = V +
VCM = V –
540
– 540
1000
0
nA
nA
∆IB
Input Bias Current Shift
1080
2000
nA
0
–1000
VCM = V – to V +
= V + (Note 5)
Input Bias Current Match (Channel-to-Channel)
VCM
VCM = V – (Note 5)
25
25
300
300
nA
nA
IOS
Input Offset Current
VCM = V +
VCM = V –
20
20
150
150
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – to V +
40
300
nA
Input Noise Voltage
0.1Hz to 10Hz
300
nVP-P
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
2
5
VS = 5V, VO = 300mV to 4.7V, RL = 10k
VS = 3V, VO = 300mV to 2.7V, RL = 10k
500
400
3500
2000
pF
V/mV
V/mV
LT1630/LT1631
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CMRR
PSRR
CONDITIONS
MIN
TYP
Common Mode Rejection Ratio
to V +
VS = 5V, VCM
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
= V–
MAX
UNITS
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
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
0°C < TA < 70°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VCM
VCM = V – + 0.2V
●
●
175
175
700
700
µV
µV
VCM = V + – 0.1V
●
●
2.5
1
5.5
3.5
µV/°C
µV/°C
VCM = V – + 0.2V to V + – 0.1V
●
175
750
µV
●
200
1200
µV
585
– 585
1100
0
nA
nA
= V + – 0.1V
VOS
Input Offset Voltage
VOS TC
Input Offset Voltage Drift (Note 3)
∆VOS
Input Offset Voltage Shift
IB
Input Offset Voltage Match (Channel-to-Channel) VCM = V – + 0.2V, V + – 0.1V (Note 5)
Input Bias Current
VCM = V + – 0.1V
VCM = V – + 0.2V
∆IB
Input Bias Current Shift
●
●
0
– 1100
VCM = V – + 0.2V to V + – 0.1V
●
1170
2200
nA
= V + – 0.1V (Note 5)
Input Bias Current Match (Channel-to-Channel)
VCM
VCM = V – + 0.2V (Note 5)
●
●
25
25
340
340
nA
nA
IOS
Input Offset Current
VCM = V + – 0.1V
VCM = V – + 0.2V
●
●
20
20
170
170
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – + 0.2V to V + – 0.1V
●
40
340
nA
AVOL
Large-Signal Voltage Gain
VS = 5V, VO = 300mV to 4.7V, RL = 10k
VS = 3V, VO = 300mV to 2.7V, RL = 10k
●
●
450
350
3500
2000
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = V – + 0.2V to V + – 0.1V
VS = 3V, VCM = V – + 0.2V to V + – 0.1V
●
●
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
●
●
70
65
90
85
dB
dB
V/mV
V/mV
3
LT1630/LT1631
ELECTRICAL CHARACTERISTICS
0°C < TA < 70°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
PSRR
Power Supply Rejection Ratio
VS = 3V to 12V, VCM = VO = 0.5V
PSRR Match (Channel-to-Channel) (Note 5)
Minimum Supply Voltage (Note 9)
VOL
●
82
101
VS = 3V to 12V, VCM = VO = 0.5V
●
78
102
VCM = VO = 0.5V
●
2.6
2.7
Output Voltage Swing Low (Note 6)
No Load
ISINK = 0.5mA
ISINK = 25mA, VS = 5V
ISINK = 20mA, VS = 3V
●
●
●
●
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
●
●
●
●
16
50
820
550
40
100
1600
1100
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3V
●
●
±18
±13
MAX
dB
dB
±36
±25
4.0
UNITS
V
mA
mA
IS
Supply Current per Amplifier
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
●
14
28
MHz
SR
Slew Rate (Note 8)
VS = 5V, AV = – 1, RL = Open, VO = 4V
VS = 3V, AV = – 1, RL = Open
●
●
4.2
3.9
8.3
7.7
V/µs
V/µs
●
5.1
mA
– 40°C < TA < 85°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
SYMBOL PARAMETER
CONDITIONS
TYP
MAX
UNITS
VOS
Input Offset Voltage
VCM = V + – 0.1V
VCM = V – + 0.2V
●
●
MIN
250
250
775
775
µV
µV
VOS TC
Input Offset Voltage Drift (Note 3)
VCM = V + – 0.1V
●
●
2.5
1
5.5
3.5
µV/°C
µV/°C
∆VOS
Input Offset Voltage Shift
VCM = V – + 0.2V to V + – 0.1V
●
200
750
µV
●
210
1500
µV
IB
Input Offset Voltage Match (Channel-to-Channel) VCM = V – + 0.2V, V + (Note 5)
Input Bias Current
VCM = V + – 0.1V
VCM = V – + 0.2V
650
– 650
1300
0
nA
nA
∆IB
Input Bias Current Shift
VCM = V – + 0.2V to V + – 0.1V
●
1300
2600
nA
Input Bias Current Match (Channel-to-Channel)
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
●
●
25
25
390
390
nA
nA
●
●
25
25
195
195
nA
nA
50
390
●
●
0
– 1300
IOS
Input Offset Current
∆IOS
Input Offset Current Shift
AVOL
Large-Signal Voltage Gain
VS = 5V, VO = 300mV to 4.7V, RL = 10k
VS = 3V, VO = 300mV to 2.7V, RL = 10k
●
●
400
300
3500
1800
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = V – + 0.2V to V + – 0.1V
VS = 3V, VCM = V – + 0.2V to V + – 0.1V
●
●
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
●
●
69
65
89
85
dB
dB
Power Supply Rejection Ratio
VS = 3V to 12V, VCM = VO = 0.5V
●
82
98
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = 3V to 12V, VCM = VO = 0.5V
●
78
102
dB
Minimum Supply Voltage (Note 9)
VCM = VO = 0.5V
●
2.6
2.7
Output Voltage Swing Low (Note 6)
No Load
ISINK = 0.5mA
ISINK = 25mA, VS = 5V
ISINK = 20mA, VS = 3V
●
●
●
●
18
38
730
580
40
80
1500
1200
PSRR
VOL
4
●
nA
V/mV
V/mV
V
mV
mV
mV
mV
LT1630/LT1631
ELECTRICAL CHARACTERISTICS
– 40°C < TA < 85°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 0.5mA
ISOURCE = 15mA, VS = 5V
ISOURCE = 10mA, VS = 3V
●
●
●
●
ISC
Short-Circuit Current
VS = 5V
VS = 3V
●
●
IS
Supply Current per Amplifier
±17
±12
TYP
MAX
UNITS
15
55
860
580
40
110
1700
1200
mV
mV
mV
mV
±34
±24
4.1
●
mA
mA
5.2
mA
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
●
14
28
MHz
SR
Slew Rate (Note 8)
VS = 5V, AV = –1, RL = Open, VO = 4V
VS = 3V, AV = –1, RL = Open
●
●
3.5
3.3
7
6.5
V/µs
V/µs
MIN
TA = 25°C, VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
TYP
MAX
UNITS
= V+
VOS
Input Offset Voltage
VCM
VCM = V –
220
220
1000
1000
µV
µV
∆VOS
Input Offset Voltage Shift
VCM = V – to V +
150
1000
µV
200
1500
µV
550
– 550
1100
0
nA
nA
1100
2200
nA
Input Offset Voltage Match (Channel-to-Channel) VCM
= V –, V + (Note 5)
IB
Input Bias Current
VCM = V +
VCM = V –
∆IB
Input Bias Current Shift
VCM = V – to V +
0
– 1100
= V + (Note 5)
Input Bias Current Match (Channel-to-Channel)
VCM
VCM = V – (Note 5)
20
20
300
300
nA
nA
IOS
Input Offset Current
VCM = V +
VCM = V –
20
20
150
150
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – to V +
40
300
nA
Input Noise Voltage
0.1Hz to 10Hz
300
en
Input Noise Voltage Density
f = 1kHz
6
nV/√Hz
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
CMRR
PSRR
nVP-P
3
pF
112
134
dB
Common Mode Rejection Ratio
VCM
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
82
107
= V–
PSRR Match (Channel-to-Channel) (Note 5)
VS = ±5V to ±15V
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
ISOURCE = 5mA
ISOURCE = 25mA
15
250
1200
40
500
2400
mV
mV
mV
dB
5
LT1630/LT1631
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
±35
±70
MAX
UNITS
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
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
0°C < TA < 70°C, VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
= V + – 0.1V
VOS
Input Offset Voltage
VOS TC
Input Offset Voltage Drift (Note 3)
∆VOS
Input Offset Voltage Shift
IB
Input Offset Voltage Match (Channel-to-Channel) VCM = V – + 0.2V, V + – 0.1V (Note 5)
Input Bias Current
VCM = V + – 0.1V
VCM = V – + 0.2V
∆IB
Input Bias Current Shift
MIN
TYP
MAX
UNITS
µV
µV
VCM
VCM = V – + 0.2V
●
●
300
300
1250
1250
VCM = V + – 0.1V
●
●
4.5
1.5
7
4
VCM = V – + 0.2V to V + – 0.1V
●
180
1100
µV
●
300
2000
µV
600
– 600
1200
0
nA
nA
●
●
0
– 1200
µV/°C
µV/°C
VCM = V – + 0.2V to V + – 0.1V
●
1200
2400
nA
= V + – 0.1V (Note 5)
Input Bias Current Match (Channel-to-Channel)
VCM
VCM = V – + 0.2V (Note 5)
●
●
30
30
350
350
nA
nA
IOS
Input Offset Current
VCM = V + – 0.1V
VCM = V – + 0.2V
●
●
25
25
175
175
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – + 0.2V to V + – 0.1V
●
50
350
nA
AVOL
Large-Signal Voltage Gain
VO = – 14.5V to 14.5V, RL = 10k
VO = – 10V to 10V, RL = 2k
●
●
900
600
6000
4000
V/mV
V/mV
Channel Separation
VO = – 10V to 10V, RL = 2k
CMRR
PSRR
●
112
132
dB
Common Mode Rejection Ratio
VCM
+ 0.2V to V + – 0.1V
●
88
104
dB
CMRR Match (Channel-to-Channel) (Note 5)
VCM = V – + 0.2V to V + – 0.1V
●
84
104
dB
Power Supply Rejection Ratio
VS = ±5V to ±15V
●
86
100
dB
80
104
= V–
PSRR Match (Channel-to-Channel) (Note 5)
VS = ±5V to ±15V
●
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 5mA
ISINK = 25mA
●
●
●
19
175
670
45
350
1400
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 5mA
ISOURCE = 25mA
●
●
●
15
300
1400
40
600
2800
mV
mV
mV
ISC
Short-Circuit Current
●
IS
Supply Current per Amplifier
●
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
●
14
28
MHz
SR
Slew Rate
AV = – 1, RL = Open, VO = ±10V,
Measured at VO = ±5V
●
4.5
9
V/µs
6
±28
dB
±57
4.6
mA
5.6
mA
LT1630/LT1631
ELECTRICAL CHARACTERISTICS
– 40°C < TA < 85°C, VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4)
SYMBOL PARAMETER
VOS
Input Offset Voltage
VOS TC
Input Offset Voltage Drift (Note 3)
∆VOS
Input Offset Voltage Shift
CONDITIONS
MIN
= V+
TYP
MAX
UNITS
µV
µV
VCM
– 0.1V
VCM = V – + 0.2V
●
●
350
350
1400
1400
VCM = V + – 0.1V
●
●
4.5
1.5
7
4
VCM = V – + 0.2V to V + – 0.1V
●
180
1200
µV
●
350
2200
µV
690
– 690
1400
0
nA
nA
= V – + 0.2V, V + – 0.1V (Note 5)
IB
Input Offset Voltage Match (Channel-to-Channel) VCM
Input Bias Current
VCM = V + – 0.1V
VCM = V – + 0.2V
∆IB
Input Bias Current Shift
●
●
0
– 1400
µV/°C
µV/°C
VCM = V – + 0.2V to V + – 0.1V
●
1380
2800
nA
= V + – 0.1V (Note 5)
Input Bias Current Match (Channel-to-Channel)
VCM
VCM = V – + 0.2V (Note 5)
●
●
30
30
420
420
nA
nA
IOS
Input Offset Current
VCM = V + – 0.1V
VCM = V – + 0.2V
●
●
30
30
210
210
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – + 0.2V to V + – 0.1V
●
60
420
AVOL
Large-Signal Voltage Gain
VO = – 14.5V to 14.5V, RL = 10k
VO = – 10V to 10V, RL = 2k
●
●
700
400
Channel Separation
VO = – 10V to 10V, RL = 2k
●
112
132
dB
CMRR
Common Mode Rejection Ratio
VCM = V – + 0.2V to V + – 0.1V
●
87
104
dB
CMRR Match (Channel-to-Channel) (Note 5)
VCM = V – + 0.2V to V + – 0.1V
●
84
104
dB
6000
4000
nA
V/mV
V/mV
Power Supply Rejection Ratio
VS = ±5V to ±15V
●
84
100
dB
PSRR Match (Channel-to-Channel) (Note 5)
VS = ±5V to ±15V
●
80
100
dB
VOL
Output Voltage Swing Low (Note 6)
No Load
ISINK = 5mA
ISINK = 25mA
●
●
●
22
180
700
50
350
1400
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 5mA
ISOURCE = 25mA
●
●
●
15
300
1500
40
600
3000
mV
mV
mV
ISC
Short-Circuit Current
●
IS
Supply Current per Amplifier
●
PSRR
±27
±54
4.8
mA
5.9
mA
GBW
Gain-Bandwidth Product (Note 7)
f = 100kHz
●
14
27
MHz
SR
Slew Rate
AV = – 1, RL = Open, VO = ±10V,
Measure at VO = ±5V
●
4.2
8.5
V/µs
The ● denotes specifications that apply over the full operating temperature
range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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 and are designed, characterized and
expected to meet these extended temperature limits, but are not tested at
– 40°C and 85°C. Guaranteed I grade parts are available, consult factory.
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.
7
LT1630/LT1631
U W
TYPICAL PERFORMANCE CHARACTERISTICS
VOS Distribution, VCM = 0V
(PNP Stage)
VOS Distribution, VCM = 5V
(NPN Stage)
50
VS = 5V, 0V
VCM = 0V
VS = 5V, 0V
VS = 5V, 0V
VCM = 5V
40
30
20
10
PERCENT OF UNITS (%)
40
PERCENT OF UNITS (%)
40
PERCENT OF UNITS (%)
∆VOS Shift for VCM = 0V to 5V
50
50
30
20
10
–300
100
300
–100
INPUT OFFSET VOLTAGE (µV)
0
–500
500
–300
100
300
–100
INPUT OFFSET VOLTAGE (µV)
1630/31 G32
600
TA = 25°C
4.0
3.5
3.0
TA = –55°C
2.5
2.0
1.5
0
4
8 12 16 20 24 28
TOTAL SUPPLY VOTAGE (V)
VS = ±15V
4.5
4.0
3.5
VS = 5V, 0V
3.0
2.5
2.0
100 125
1.0
–600
TA = 25°C
VS = ±15V
VCM = – 15V
–1
0
2
3
4
5
1
COMMON MODE VOLTAGE (V)
6
1630/31 G03
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
1630/31 G04
TA = – 55°C
–1000
–2
SATURATION VOLTAGE (V)
SATURATION VOLTAGE (V)
INPUT BIAS CURRENT (µA)
VS = ±15V
VCM = 15V
–1.0
–50 –35 –20 –5 10 25 40 55 70 85 100
TEMPERATURE (°C)
8
TA = 125°C
VS = 5V, 0V
0
–0.8
–400
10
VS = 5V, 0V
VCM = 5V
0.2
–0.6
–200
Output Saturation Voltage vs
Load Current (Output Low)
Input Bias Current vs Temperature
–0.4
0
1630/31 G02
1630/31 G01
–0.2
200
–800
1.5
1.0
25 50 75
–75 –50 –25 0
TEMPERATURE (°C)
32 36
VS = 5V, 0V
400
INPUT BIAS CURRENT (nA)
SUPPLY CURRENT PER AMPLIFIER (mA)
SUPPLY CURRENT PER AMPLIFIER (mA)
TA = 125°C
4.5
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
0.4
0
–500
500
1630/31 G33
Supply Current vs Supply Voltage
0.6
20
10
0
–500
0.8
30
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
LT1630/LT1631
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Supply Voltage
10
VS = 5V, 0V
200
150
TA = 25°C
100
TA = –55°C
20
15
10
50
5
0
0
4
2
3
TOTAL SUPPLY VOLTAGE (V)
45
60
90
40
PHASE
50
45
40
0
30
–45
GAIN
20
–90
10
–135
0
0.1
1
10
FREQUENCY (MHz)
POWER SUPPLY REJECTION RATIO (dB)
COMMON MODE REJECTION RATIO (dB)
100
90
80
35
70
GAIN BANDWIDTH
30
50
PHASE MARGIN
20
VS = ±15V
30
10
20
–225
5
10
–270
100
0
0
5
80
VS = 5V, 0V
Channel Separation vs Frequency
50
40
30
20
POSITIVE SUPPLY
60
50
NEGATIVE SUPPLY
40
30
20
1630/31 G12
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
10
0
10M
0
30
15
20
25
10
TOTAL SUPPLY VOLTAGE (V)
1630/31 G14
80
70
40
–180
VS = ±15V
90
60
25
PSRR vs Frequency
100
110
1000
VCM = VS /2
1630/31 G11
CMRR vs Frequency
100k
1M
FREQUENCY (Hz)
10
100
FREQUENCY (Hz)
15
RL = 1k
VS = 3V, 0V
VS = ±15V
120
10k
VCM = 2.5V
PNP ACTIVE
PHASE MARGIN (DEG)
VOLTAGE GAIN (dB)
50
135
PHASE SHIFT (DEG)
OUTPUT VOLTAGE (200nV/DIV)
180
1630/31 G25
1k
2
Gain Bandwidth and Phase
Margin vs Supply Voltage
70
TIME (1s/DIV)
60
VCM = 4.25V
NPN ACTIVE
3
1630/31 G10
80
–20
0.01
70
4
1
Gain and Phase vs Frequency
–10
90
5
11630/31 G09
0.1Hz to 10Hz Output
Voltage Noise
100
6
1000
1630/31 G07
VS =5V, 0V
VCM = VS /2
7
0
10
100
FREQUENCY (Hz)
1
5
8
1
GAIN BANDWIDTH (MHz)
1
VCM = 4.25V
NPN ACTIVE
CHANNEL SEPARATION (dB)
TA = 125°C
VCM = 2.5V
PNP ACTIVE
25
CURRENT NOISE (pA/√Hz)
250
VS = 5V, 0V
9
30
NOISE VOLTAGE (nV/√Hz)
CHANGE IN OFFSET VOLTAGE (µV)
Current Noise Spectrum
Noise Voltage Spectrum
35
300
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1630/31 G13
–140
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
1630/31 G15
9
LT1630/LT1631
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Capacitive Load Handling
60
10
14
VOUT = 80% OF VS
AV = –1
SLEW RATE (V/µs)
13
40
30
20
10
VS = ±15V
8
6
RISING EDGE
12
OUTPUT STEP (V)
VS = 5V, 0V
AV = 1
RL = 1k
50
OVERSHOOT (%)
Output Step vs
Settling Time to 0.01%
Slew Rate vs Supply Voltage
11
FALLING EDGE
10
NONINVERTING
2
0
–2
–4
NONINVERTING
–6
9
INVERTING
4
INVERTING
–8
0
10
100
CAPACITIVE LOAD (pF)
1
–10
8
1000
0
8
12 16 20 24 28
TOTAL SUPPLY VOLTAGE (V)
4
1630/31 G16
VS = ±15V
5
RL = 10k
–5
6
150
4
100
INPUT VOLTAGE (µV)
INPUT VOLTAGE (µV)
2
RL = 10k
0
RL = 1k
–2
–50
–100
–15
–6
–150
15
–200
–8
20
0
1
2
4
3
OUTPUT VOLTAGE (V)
5
0
–40
LT1631CS
VS = 5V, 0V
–80
N8 PACKAGE
VS = 5V, 0V
N8 PACKAGE
VS = ±15V
S8 PACKAGE
VS = ±15V
–120
LT1631CS
VS = ±15V
–160
OUTPUT VOLTAGE SWING (VP-P)
S8 PACKAGE
VS = 5V, 0V
20
40 60 80 100 120 140 160
TIME AFTER POWER-UP (SEC)
1630/31 G22
10
7
1
VIN = 2VP-P
RL = 10k
VS = 5V, 0V
AV = –1
4
0.1
VS = 5V, 0V
AV = 1
3
2
0.01
0.001
1
VS = 3V, 0V
AV = 1
VS = 5V, 0V AND 3V, 0V
AV = –1
VS = 5V, 0V
AV = 1
0
0
6
Total Harmonic Distortion + Noise
vs Frequency
5
40
5
1630/31 G21
Maximum Undistorted Output
Signal vs Frequency
Warm-Up Drift vs Time
–200
–5 –4 –3 –2 –1 0 1 2 3 4
OUTPUT VOLTAGE (V)
6
1630/31 G20
1630/31 G19
CHANGE IN OFFSET VOLTAGE (µV)
0
–4
– 20
0
5
–20 –15 –10 – 5
10
OUTPUT VOLTAGE (V)
VS = ±15V
RL = 100Ω
50
–10
THD + NOISE (%)
INPUT VOLTAGE (µV)
200
VS = 5V, 0V
RL = 1k
1.50
Open-Loop Gain
Open-Loop Gain
10
1.25
1.00
0.50 0.75
SETTLING TIME (µs)
1630/31 G18
8
15
0
0.25
1630/31 G17
Open-Loop Gain
20
0
32
1
10
100
FREQUENCY (kHz)
1000
1630/31 G24
0.0001
0.1
10
1
FREQUENCY (kHz)
100
163031 G23
LT1630/LT1631
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Harmonic Distortion vs Frequency
5V Small-Signal Response
5V Large-Signal Response
HARMONIC DISTORTION (dBc)
0
–20
VS = 5V, 0V
AV = 1
VIN = 2VP-P
RL = 150Ω
RL = 1k
–40
2ND
–60
3RD
2ND
–80
3RD
–100
100
VS = 5V, 0V
AV = 1
RL = 1k
1630/31 G26
VS = 5V, 0V
AV = 1
RL = 1k
1630/31 G27
1000
200
500
FREQUENCY (kHz)
1630/31
1000G30
±15V Small-Signal Response
Harmonic Distortion vs Frequency
±15V Large-Signal Response
HARMONIC DISTORTION (dBc)
0
–20
VS = 5V, 0V
AV = –1
VIN = 2VP-P
RL = 150Ω
RL = 1k
–40
2ND
–60
3RD
–80
2ND
VS = ±15V
AV = 1
RL = 1k
3RD
–100
100
200
500
FREQUENCY (kHz)
1630/31 G28
VS = ±15V
AV = 1
RL = 1k
1630/31 G29
1000
1630/31
1000G31
U
W
U
U
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
transistor 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.
11
LT1630/LT1631
U
U
W
U
APPLICATIONS INFORMATION
V+
R3
+
I1
D1
R6
+ IN 225Ω
Q12
Q11
R5
Q15
Q13
+
Q5
R7
– IN 225Ω
R4
D5
VBIAS
I2
D2
D6
V–
Q4
Q3
C2
CC
OUT
Q2
Q1
D3
Q9
Q8
D4
Q7
BUFFER
AND
OUTPUT BIAS
C1
Q6
V–
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
12
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.
LT1630/LT1631
U
W
U
U
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.
13
LT1630/LT1631
U
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
4 3 2Ω
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.
C
1000pF
R4
20k
C1
2.2
µF
VS
R1
20k
R
1.62k
VI N
–
OUT1
1/2 LT1630
R3
2k
+
VI N–
5V
R1
500
Ω
–
1/2 LT1630
VI N+
+
VO U T
L O W E R L TI M
COMMON
I
MODE INPUT VOLTAGE
 VOUT  R2
 1.0
VCML = 
+ 0.1V 

 A V  R5
 1.1
UPPER LIMIT COMMON MODE INPUT VOLTAGE
 V  R2
 1.0
VCMH =  OUT 
+ VS − 0.15V 
 A V  R5
 1.1
(
)
A2
1/2 LT1630
5V
R10
10k
C2
4.µ
7F
+
fO = 98kHz
1
fO =
2πRC
VO(DC) =
AV = 2
(5V)(R11) = 2.5V
R11 + R10
Figure 4. Tunable Q Notch Filter
50
40
DIFFERENTIAL INPUT
30
GAIN (VOUT/VIN)(dB)
VOLTAGE GAIN (dB)
20
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)
1M
10M
1630/31 F03
Figure 3. Frequency Response
14
R7
1k
1630/31 F04
R11
10k
WHERE VS IS THE SUPPLY VOLTAGE
40
VO U T
–
R8
5k
R9
1k
Figure 2. Single Supply, 40dB Gain Instrumentation Amplifier
A1
1/2 LT1630
R6
R5
1k
1k
C5
4.7
µF
–
1630/31 F02
BW = 355kHz
R4  R2 R3 + R2 
AV =
1+
+
= 100
R3  R1
R5 
−
 +
VOUT =  VIN − VIN  • AV


R2
1k
+
R
1.62k
C
1000pF
–40
0
20 40 60 80 100 120 140 160 180 200
FREQUENCY (kHz)
13630/31 F05
Figure 5. Frequency Response
LT1630/LT1631
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
(
+0.035
0.325 –0.015
+0.889
8.255
–0.381
0.130 ± 0.005
(3.302 ± 0.127)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
)
0.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.125
(3.175) 0.020
MIN (0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.100 ± 0.010
(2.540 ± 0.254)
N8 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.053 – 0.069
(1.346 – 1.752)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
7
8
5
6
0.004 – 0.010
(0.101 – 0.254)
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.050
(1.270)
TYP
1
3
2
4
SO8 0996
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
14
0.053 – 0.069
(1.346 – 1.752)
0.016 – 0.050
0.406 – 1.270
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
12
11
10
9
8
0.004 – 0.010
(0.101 – 0.254)
0° – 8° TYP
0.014 – 0.019
(0.355 – 0.483)
13
0.050
(1.270)
TYP
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
1
2
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.
3
4
5
6
7
S14 0695
15
LT1630/LT1631
U
TYPICAL APPLICATIONS
5V
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.
R2
453Ω
R4
10Ω
R1
10Ω
5V
–
Q1
2N3906
A1
1/2 LT1630
Q2
2N3906
+
C1
0.01µF
+
+
R3
10k
L1
220µH
C2
1500pF
HP-MSA0785
VIN
C3
1500pF
+
C5
0.01µF
C6
0.01µF
L2
220µH
HP-MSA0785
C4
1500pF
VOUT
RF2
RF1
L3
3.9µH
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-LoadTM 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
C-Load is a trademark of Linear Technology Corporation.
16
Linear Technology Corporation
16301f LT/TP 0998 4K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
 LINEAR TECHNOLOGY CORPORATION 1998