LINER LT6231 215mhz, rail-to-rail output Datasheet

LT6230/LT6230-10
LT6231/LT6232
215MHz, Rail-to-Rail Output,
1.1nV/√Hz, 3.5mA Op Amp Family
Features
Description
Low Noise Voltage: 1.1nV/√Hz
n Low Supply Current: 3.5mA/Amp Max
n Low Offset Voltage: 350µV Max
n Gain Bandwidth Product:
LT6230: 215MHz; AV ≥ 1
LT6230-10: 1450MHz; AV ≥ 10
n Wide Supply Range: 3V to 12.6V
n Output Swings Rail-to-Rail
n Common Mode Rejection Ratio: 115dB Typ
n Output Current: 30mA
n Operating Temperature Range: –40°C to 85°C
n LT6230 Shutdown to 10µA Maximum
n LT6230/LT6230-10 in a Low Profile (1mm)
ThinSOT™ Package
n Dual LT6231 in 8-Pin SO and Tiny DFN Packages
n LT6232 in a 16-Pin SSOP Package
The LT®6230/LT6231/LT6232 are single/dual/quad low
noise, rail-to-rail output unity-gain stable op amps that
feature 1.1nV/√Hz noise voltage and draw only 3.5mA of
supply current per amplifier. These amplifiers combine
very low noise and supply current with a 215MHz gainbandwidth product, a 70V/µs slew rate and are optimized
for low supply voltage signal conditioning systems. The
LT6230-10 is a single amplifier optimized for higher gain
applications resulting in higher gain bandwidth and slew
rate. The LT6230 and LT6230-10 include an enable pin
that can be used to reduce the supply current to less
than 10µA.
n
Applications
n
n
n
n
n
Ultrasound Amplifiers
Low Noise, Low Power Signal Processing
Active Filters
Driving A/D Converters
Rail-to-Rail Buffer Amplifiers
The amplifier family has an output that swings within 50mV
of either supply rail to maximize the signal dynamic range
in low supply applications and is specified on 3.3V, 5V and
±5V supplies. The en • √ISUPPLY product of 1.9 per amplifier
is among the most noise efficient of any op amp.
The LT6230/LT6230-10 are available in the 6-lead SOT‑23
package and the LT6231 dual is available in the 8-pin SO
package with standard pinouts. For compact layouts,
the dual is also available in a tiny dual fine pitch leadless
package (DFN). The LT6232 is available in the 16-pin
SSOP package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Typical Application
Noise Voltage and Unbalanced
Noise Current vs Frequency
Low Noise Low Power Instrumentation Amplifier
6
+
R4
499Ω
1/2 LT6231
–
+
LT6202
R3
196Ω
–
1/2 LT6231
+
VS–
5
VS+
R2
196Ω
R1
10Ω
IN–
R6
499Ω
VOUT
–
R5
499Ω
VS–
R7
499Ω
NOISE VOLTAGE (nV/√Hz)
IN+
VS = ±2.5V
TA = 25°C
VCM = 0V
4
6
5
4
3
NOISE CURRENT
2
3
2
1
NOISE VOLTAGE
1
623012 TA01a
AV = 40
BW = 5.1MHz
VS = ±1.5V to ±5V
IS = 10mA
EN = 5.8µVRMS INPUT REFERRED,
MEASUREMENT BW = 8MHz
0
10
100
1k
10k
FREQUENCY (Hz)
UNBALANCED NOISE CURRENT (pA/√Hz)
VS+
0
100k
623012 TA01b
623012fc
1
LT6230/LT6230-10
LT6231/LT6232
Absolute Maximum Ratings (Note 1)
Total Supply Voltage (V+ to V–)............................... 12.6V
Input Current (Note 2).......................................... ±40mA
Output Short-Circuit Duration (Note 3)............. Indefinite
Operating Temperature Range (Note 4)....–40°C to 85°C
Specified Temperature Range (Note 5).....–40°C to 85°C
Junction Temperature............................................ 150°C
Junction Temperature (DD Package)..................... 125°C
Storage Temperature Range................... –65°C to 150°C
Storage Temperature Range
(DD Package)......................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec).................... 300°C
Pin Configuration
TOP VIEW
TOP VIEW
6 V+
OUT 1
V– 2
5 ENABLE
+IN 3
4 –IN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 250°C/W
OUT A
1
–IN A
2
+IN A
3
V–
4
–
+
–
+
8
V+
7
OUT B
6
–IN B
5
+IN B
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 160°C/W
UNDERSIDE METAL CONNECTED TO V– (PCB CONNECTION OPTIONAL)
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V–
4
–
+
–
+
8
V+
7
OUT B
V
6
–IN B
+IN B 5
+IN B
–IN B 6
5
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 200°C/W
+IN A 3
+
–
+
A
15 –IN D
14 +IN D
D
4
OUT B 7
NC 8
OUT D
–
–IN A 2
OUT A 1
16
+
TOP VIEW
13 V
+
–B
+
C–
–
12 +IN C
11 –IN C
10 OUT C
9
NC
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 150°C, θJA = 135°C/W
623012fc
2
LT6230/LT6230-10
LT6231/LT6232
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LT6230CS6#PBF
LT6230CS6#TRPBF
LTAFJ
6-Lead Plastic TS0T-23
0°C to 70°C
LT6230IS6#PBF
LT6230IS6#TRPBF
LTAFJ
6-Lead Plastic TS0T-23
–40°C to 85°C
LT6230CS6-10#PBF
LT6230CS6-10#TRPBF
LTAFK
6-Lead Plastic TS0T-23
0°C to 70°C
LT6230IS6-10#PBF
LT6230IS6-10#TRPBF
LTAFK
6-Lead Plastic TS0T-23
–40°C to 85°C
LT6231CS8#PBF
LT6230CS8#TRPBF
6231
8-Lead Plastic SO
0°C to 70°C
LT6231IS8#PBF
LT6230IS8#TRPBF
6231I
8-Lead Plastic SO
–40°C to 85°C
LT6231CDD#PBF
LT6231CDD#TRPBF
LAEU
8-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LT6231IDD#PBF
LT6231IDD#TRPBF
LAEU
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LT6232CGN#PBF
LT6232CGN#TRPBF
6232
16-Lead Narrow Plastic SSOP
0°C to 70°C
LT6232IGN#PBF
LT6232IGN#TRPBF
6232I
16-Lead Narrow Plastic SSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
Electrical Characteristics
ENABLE = 0V, unless otherwise noted.
SYMBOL PARAMETER
VOS
Input Offset Voltage
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply,
CONDITIONS
MIN
LT6230S6, LT6230S6-10
LT6231S8, LT6232GN
LT6231DD
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
IB
IOS
Input Bias Current
TYP
MAX
UNITS
100
50
75
500
350
450
µV
µV
µV
100
600
µV
5
10
µA
IB Match (Channel-to-Channel) (Note 6)
0.1
0.9
µA
Input Offset Current
0.1
0.6
µA
1.7
nV/√Hz
Input Noise Voltage
0.1Hz to 10Hz
180
en
Input Noise Voltage Density
f = 10kHz, VS = 5V
1.1
nVP-P
in
Input Noise Current Density, Balanced Source
Input Noise Current Density, Unbalanced Source
f = 10kHz, VS = 5V, RS = 10k
f = 10kHz, VS = 5V, RS = 10k
1
2.4
pA/√Hz
pA/√Hz
Input Resistance
Common Mode
Differential Mode
6.5
7.5
MΩ
kΩ
CIN
Input Capacitance
Common Mode
Differential Mode
2.9
7.7
pF
pF
AVOL
Large-Signal Gain
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2
VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2
VS = 5V, VO = 1V to 4V, RL = 100Ω to VS/2
105
21
5.4
200
40
9
V/mV
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2
VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2
90
16.5
175
32
V/mV
V/mV
1.5
1.15
VCM
Input Voltage Range
Guaranteed by CMRR, VS = 5V, 0V
Guaranteed by CMRR, VS = 3.3V, 0V
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = 1.5V to 4V
VS = 3.3V, VCM = 1.15V to 2.65V
90
90
115
115
dB
dB
CMRR Match (Channel-to-Channel) (Note 6)
VS = 5V, VCM = 1.5V to 4V
84
120
dB
4
2.65
V
V
623012fc
3
LT6230/LT6230-10
LT6231/LT6232
Electrical Characteristics
ENABLE = 0V, unless otherwise noted.
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply,
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
PSRR
Power Supply Rejection Ratio
VS = 3V to 10V
90
115
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
84
115
dB
Minimum Supply Voltage (Note 7)
MAX
3
UNITS
V
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 20mA
VS = 3.3V, ISINK = 15mA
4
85
240
185
40
190
460
350
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 20mA
VS = 3.3V, ISOURCE = 15mA
5
90
325
250
50
200
600
400
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3.3V
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = V+ – 0.35V
3.15
0.2
3.5
10
mA
µA
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
–25
–75
µA
VL
ENABLE Pin Input Voltage Low
0.3
V
10
µA
VH
±30
±25
±45
±40
mA
mA
V+ – 0.35V
ENABLE Pin Input Voltage High
V
Output Leakage Current
ENABLE = V+ – 0.35V, VO = 1.5V to 3.5V
0.2
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
300
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
GBW
Gain-Bandwidth Product
Frequency = 1MHz, VS = 5V
LT6230-10
SR
Slew Rate
VS = 5V, A V = –1, RL = 1k, VO = 1.5V to 3.5V
41
42
LT6230-10, VS = 5V, AV = –10, RL = 1k,
VO = 1.5V to 3.5V
4.8
ns
µs
200
1300
MHz
MHz
60
V/µs
250
V/µs
6.3
MHz
FPBW
Full-Power Bandwidth
VS = 5V, VOUT = 3VP-P (Note 9)
LT6230-10, HD2 = HD3 = ≤1%
11
MHz
tS
Settling Time (LT6230, LT6231, LT6232)
0.1%, VS = 5V, VSTEP = 2V, AV = –1, RL = 1k
55
ns
623012fc
4
LT6230/LT6230-10
LT6231/LT6232
Electrical Characteristics
The l denotes the specifications which apply over the 0°C < TA < 70°C
temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230CS6, LT6230CS6-10
LT6231CS8, LT6232CGN
LT6231CDD
MIN
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
VOS TC
IB
Input Offset Voltage Drift (Note 10)
µV
µV
µV
l
800
µV
0.5
l
3
µV/°C
l
11
µA
l
1
µA
Input Offset Current
Large-Signal Gain
Input Voltage Range
Common Mode Rejection Ratio
0.7
l
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2
VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2
VS = 5V, VO = 1V to 4V, RL = 100Ω to VS/2
µA
l
l
l
78
17
4.1
V/mV
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2 l
VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2 l
66
13
V/mV
V/mV
Guaranteed by CMRR
VS = 5V, 0V
Vs = 3.3V, 0V
l
l
1.5
1.15
VS = 5V, VCM = 1.5V to 4V
VS = 3.3V, VCM = 1.15V to 2.65V
l
l
90
85
dB
dB
l
84
dB
CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V
PSRR
UNIT
600
450
550
Input Bias Current
AVOL
CMRR
TYP
IB Match (Channel-to-Channel) (Note 6)
IOS
VCM
VCM = Half Supply
MAX
l
l
l
4
2.65
V
V
Power Supply Rejection Ratio
VS = 3V to 10V
l
85
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
l
79
dB
l
3
Minimum Supply Voltage (Note 7)
V
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 20mA
VS = 3.3V, ISINK = 15mA
l
l
l
l
50
200
500
380
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 20mA
VS = 3.3V, ISOURCE = 15mA
l
l
l
l
60
215
650
430
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3.3V
l
l
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = V+ – 0.25V
l
l
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
ENABLE Pin Input Voltage Low
VH
ENABLE Pin Input Voltage High
±25
±20
mA
mA
4.2
mA
µA
l
–85
µA
l
0.3
V
l
1
V+ – 0.25V
V
Output Leakage Current
ENABLE = V+ – 0.25V, V
l
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
l
300
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
l
65
µs
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V
l
225
V/µs
O = 1.5V to 3.5V
35
LT6230-10, AV = –10, RL = 1k, VO = 1.5V to 3.5V l
FPBW
Full-Power Bandwidth (Note 9)
VS = 5V, VOUT = 3VP-P; LT6230C, LT6231C,
LT6232C
l
3.7
V/µs
MHz
623012fc
5
LT6230/LT6230-10
LT6231/LT6232
Electrical Characteristics
The l denotes the specifications which apply over the –40°C < TA < 85°C
temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230IS6, LT6230IS6-10
LT6231IS8, LT6232IGN
LT6231IDD
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
VOS TC
Input Offset Voltage Drift (Note 10)
IB
Input Bias Current
VCM = Half Supply
MIN
MAX
UNITS
l
l
l
700
550
650
µV
µV
µV
l
1000
µV
3
µV/°C
l
12
µA
1.1
µA
0.8
µA
IB Match (Channel-to-Channel) (Note 6)
IOS
Input Offset Current
l
AVOL
Large-Signal Gain
Input Voltage Range
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2
VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2
VS = 5V, VO = 1V to 4V, RL = 100Ω to VS/2
l
l
l
72
16
3.6
V/mV
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2
VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2
l
l
60
12
V/mV
V/mV
Guaranteed by CMRR
VS = 5V, 0V
VS = 3.3V, 0V
l
l
1.5
1.15
VS = 5V, VCM = 1.5V to 4V
VS = 3.3V, VCM = 1.15V to 2.65V
l
l
90
85
dB
dB
l
84
dB
l
85
dB
l
79
dB
l
3
V
CMRR
Common Mode Rejection Ratio
PSRR
CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V
Power Supply Rejection Ratio
VS = 3V to 10V
PSRR Match (Channel-to-Channel) (Note 6)
0.5
l
l
VCM
TYP
VS = 3V to 10V
Minimum Supply Voltage (Note 7)
4
2.65
V
V
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 15mA
VS = 3.3V, ISINK = 15mA
l
l
l
l
60
210
510
390
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 20mA
VS = 3.3V, ISOURCE = 15mA
l
l
l
l
70
220
675
440
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3.3V
l
l
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = V+ – 0.2V
l
l
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
VH
±15
±15
mA
mA
4.4
mA
µA
l
–100
µA
ENABLE Pin Input Voltage Low
l
0.3
ENABLE Pin Input Voltage High
l V+ – 0.2V
1
V
V
Output Leakage Current
ENABLE = V+ – 0.2V, VO = 1.5V to 3.5V
l
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
l
300
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
l
72
µs
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V
l
LT6230-10, AV = –10, RL = 1k, VO = 1.5V to 3.5V
l
VS = 5V, VOUT = 3VP-P; LT6230I, LT6231I,
LT6232I
l
FPBW
Full-Power Bandwidth (Note 9)
31
V/µs
185
3.3
V/µs
MHz
623012fc
6
LT6230/LT6230-10
LT6231/LT6232
Electrical Characteristics
TA = 25°C, VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230, LT6230-10
LT6231S8, LT6232GN
LT6231DD
MIN
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
IB
Input Bias Current
IB Match (Channel-to-Channel) (Note 6)
IOS
Input Offset Current
TYP
MAX
UNITS
100
50
75
500
350
450
µV
µV
µV
100
600
µV
5
10
µA
0.1
0.9
µA
0.1
0.6
µA
Input Noise Voltage
0.1Hz to 10Hz
180
en
Input Noise Voltage Density
f = 10kHz
1.1
in
Input Noise Current Density, Balanced Source
Input Noise Current Density, Unbalanced Source
f = 10kHz, RS = 10k
f = 10kHz, RS = 10k
1
2.4
pA/√Hz
pA/√Hz
Input Resistance
Common Mode
Differential Mode
6.5
7.5
MΩ
kΩ
CIN
Input Capacitance
Common Mode
Differential Mode
2.4
6.5
pF
pF
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k
VO = ±4.5V, RL = 1k
VO = ±2V, RL = 100Ω
260
65
16
V/mV
V/mV
V/mV
VCM
Input Voltage Range
Guaranteed by CMRR
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
95
140
35
8.5
nVP-P
1.7
4
120
nV/√Hz
V
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
89
125
dB
PSRR
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
90
115
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
84
115
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
ISINK = 20mA
4
85
240
40
190
460
mV
mV
mV
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 20mA
5
90
325
50
200
600
mV
mV
mV
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = 4.65V
3.3
0.2
3.9
mA
µA
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
–35
–85
µA
VL
ENABLE Pin Input Voltage Low
0.3
V
VH
ENABLE Pin Input Voltage High
10
µA
dB
±30
mA
4.65
V
Output Leakage Current
ENABLE = V+ – 4.65V, VO = ±1V
0.2
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
300
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
62
µs
GBW
Gain-Bandwidth Product
Frequency = 1MHz
LT6230-10
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
150
1000
50
LT6230-10, AV = –10, RL = 1k, VO = –2V to 2V
FPBW
tS
Full-Power Bandwidth
Settling Time (LT6230, LT6231, LT6232)
VOUT = 3VP-P (Note 9)
5.3
215
1450
MHz
MHz
70
V/µs
320
V/µs
7.4
MHz
LT6230-10, HD2 = HD3 ≤ 1%
11
MHz
0.1%, VSTEP = 2V, AV = –1, RL = 1k
50
ns
623012fc
7
LT6230/LT6230-10
LT6231/LT6232
Electrical Characteristics
The l denotes the specifications which apply over the 0°C < TA < 70°C
temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230CS6, LT6230CS6-10
LT6231CS8, LT6232CGN
LT6231CDD
MIN
TYP
MAX
UNITS
l
l
l
600
450
550
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
l
800
µV
VOS TC
Input Offset Voltage Drift (Note 10)
l
IB
Input Bias Current
l
IB Match (Channel-to-Channel) (Note 6)
IOS
Input Offset Current
AVOL
Large-Signal Gain
0.5
3
µV/°C
11
µA
l
1
µA
l
0.7
µA
VO = ±4.5V, RL = 10k
VO = ±4.5V, RL = 1k
VO = ±2V, RL = 100Ω
l
l
l
100
27
6
V/mV
V/mV
V/mV
VCM
Input Voltage Range
Guaranteed by CMRR
l
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
l
95
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
l
89
dB
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
l
85
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
l
79
dB
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
ISINK = 20mA
l
l
l
50
200
500
mV
mV
mV
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 20mA
l
l
l
60
215
650
mV
mV
mV
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = 4.75V
l
l
ENABLE = 0.3V
PSRR
IENABLE
ENABLE Pin Current
VL
ENABLE Pin Input Voltage Low
VH
ENABLE Pin Input Voltage High
tON
l
mA
mA
µA
l
–95
µA
l
0.3
V
l
Output Leakage Current
ENABLE = 4.75V, VO = ±1V
l
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
l
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
l
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
l
LT6230-10, AV = –10, RL = 1k, VO = –2V to 2V
l
VOUT = 3VP-P (Note 9) LT6230C, LT6231C,
LT6232C
l
Full-Power Bandwidth
±25
V
4.6
tOFF
FPBW
4
1
4.75
V
1
µA
300
ns
85
44
315
4.66
µs
V/µs
V/µs
MHz
623012fc
8
LT6230/LT6230-10
LT6231/LT6232
Electrical Characteristics
The l denotes the specifications which apply over the –40°C < TA < 85°C
temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
VOS
Input Offset Voltage
LT6230I, LT6230I-10
LT6231IS8, LT6232IGN
LT6231IDD
TYP
MAX
UNITS
l
l
l
700
550
650
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
l
1000
µV
VOS TC
Input Offset Voltage Drift (Note 10)
l
3
µV/°C
IB
Input Bias Current
l
12
µA
IB Match (Channel-to-Channel) (Note 6)
l
1.1
µA
IOS
Input Offset Current
l
0.8
µA
AVOL
Large-Signal Gain
0.5
VO = ±4.5V, RL = 10k
VO = ±4.5V, RL = 1k
VO = ±1.5V, RL = 100Ω
l
l
l
93
25
4.8
V/mV
V/mV
V/mV
VCM
Input Voltage Range
Guaranteed by CMRR
l
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
l
95
dB
CMRR Match (Channel-to-Channel) (Note 6) VCM = –3V to 4V
l
89
dB
85
dB
79
dB
4
V
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
l
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
l
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
ISINK = 15mA
l
l
l
60
210
510
mV
mV
mV
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 20mA
l
l
l
70
220
675
mV
mV
mV
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = 4.8V
l
l
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
ENABLE Pin Input Voltage Low
VH
ENABLE Pin Input Voltage High
l
PSRR
l
mA
µA
l
–110
µA
l
0.3
V
Output Leakage Current
ENABLE = 4.8V, VO = ±1V
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
l
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
l
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
l
LT6230-10, AV = –10, RL = 1k, VO = –2V to 2V
l
VOUT = 3VP-P; LT6230I, LT6231I, LT6232I
l
Full-Power Bandwidth (Note 9)
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: Inputs are protected by back-to-back diodes. If the differential
input voltage exceeds 0.7V, the input current must be limited to less than
40mA.
Note 3: A heat sink may be required to keep the junction temperature
below the absolute maximum rating when the output is shorted
indefinitely.
mA
4.85
l
FPBW
±15
1
4.8
V
1
µA
300
ns
72
37
260
3.9
µs
V/µs
V/µs
MHz
Note 4: The LT6230C/LT6230I the LT6231C/LT6231I, and LT6232C/LT6232I
are guaranteed functional over the temperature range of –40°C and 85°C.
Note 5: The LT6230C/LT6231C/LT6232C are guaranteed to meet specified
performance from 0°C to 70°C. The LT6230C/LT6231C/LT6232C 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 LT6230I/LT6231I/LT6232I are guaranteed to meet specified
performance from –40°C to 85°C.
623012fc
9
LT6230/LT6230-10
LT6231/LT6232
Electrical Characteristics
Note 6: Matching parameters are the difference between the two amplifiers
A and D and between B and C of the LT6232; between the two amplifiers
of the LT6231. CMRR and PSRR match are defined as follows: CMRR and
PSRR are measured in µV/V on the matched amplifiers. The difference is
calculated between the matching sides in µV/V. The result is converted to
dB.
Note 7: Minimum supply voltage is guaranteed by power supply rejection
ratio test.
Note 8: Output voltage swings are measured between the output and
power supply rails.
Note 9: Full-power bandwidth is calculated from the slew rate:
FPBW = SR/2πVP
Note 10: This parameter is not 100% tested.
Typical Performance Characteristics
(LT6230/LT6231/LT6232)
Supply Current vs Supply Voltage
(Per Amplifier)
VOS Distribution
6
100
2.0
60
50
40
30
20
4
TA = 125°C
3
TA = 25°C
2
TA = –55°C
1
10
0
50 100 150 200
–200 –150 –100 –50 0
INPUT OFFSET VOLTAGE (µV)
0
10
0
2
4
8
10
12
6
TOTAL SUPPLY VOLTAGE (V)
TA = –55°C
TA = 125°C
TA = 25°C
2
0
4
5
3
2
COMMON MODE VOLTAGE (V)
1
6
623012 GO4
TA = 25°C
TA = 125°C
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT COMMON MODE VOLTAGE (V)
Output Saturation Voltage
vs Load Current (Output Low)
10
VS = 5V, 0V
8
7
VCM = 4V
6
VCM = 1.5V
5
4
0
TA = –55°C
–1.0
623012 GO3
OUTPUT SATURATION VOLTAGE (V)
10
–1
–0.5
–2.0
14
9
INPUT BIAS CURRENT (µA)
INPUT BIAS CURRENT (µA)
12
4
0
Input Bias Current vs Temperature
VS = 5V, 0V
6
0.5
623012 GO2
Input Bias Current
vs Common Mode Voltage
8
1.0
–1.5
623012 GO1
–2
OFFSET VOLTAGE (mV)
70
VS = 5V, 0V
1.5
5
SUPPLY CURRENT (mA)
NUMBER OF UNITS
VS = 5V, 0V
+
90 VCM = V /2
S8
80
14
Offset Voltage vs Input Common
Mode Voltage
3
–50 –25
0
50
75
25
TEMPERATURE (°C)
100
125
623012 GO5
VS = 5V, 0V
1
TA = 125°C
0.1
TA = –55°C
0.01
0.001
TA = 25°C
0.01
10
0.1 1
LOAD CURRENT (mA)
100
623012 GO6
623012fc
10
LT6230/LT6230-10
LT6231/LT6232
Typical Performance Characteristics
(LT6230/LT6231/LT6232)
Output Saturation Voltage
vs Load Current (Output High)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
TOTAL SUPPLY VOLTAGE (V)
70
60
SINKING
TA = 125°C
50
40
TA = 25°C
30
20
TA = –55°C
10
0
–10
SOURCING
TA = 125°C
–20
TA = –55°C
–30
–40
–50
TA = 25°C
–60
–70
2
2.5
3.5
4
4.5
5
3
1.5
POWER SUPPLY VOLTAGE (±V)
623012 G08
623012 GO9
1.0
VCM = VS/2
0.8
0.6
1
TA = 125°C
0.1
TA = –55°C
TA = 25°C
0.01
0.4
0.2
0
–0.2
TA = –55°C
–0.4
TA = 125°C
–0.6
TA = 25°C
–0.8
0.001
0.01
0.1 1
10
LOAD CURRENT (mA)
–1.0
100
623012 G07
Open-Loop Gain
2.5
Open-Loop Gain
2.5
VS = 3V, 0V
TA = 25°C
2.0
0.5
RL = 1k
0
RL = 100Ω
–0.5
–1.0
1.5
INPUT VOLTAGE (mV)
1.0
1.0
0.5
RL = 1k
0
RL = 100Ω
–0.5
–1.0
1.0
0.5
–0.5
–1.5
–1.5
–2.0
–2.0
–2.5
–2.5
2.5
3
623012 G10
1.0
30
VS = ±5V
TA = –55°C
0.5
0
–0.5
TA = 25°C
TA = 125°C
–1.0
–1.5
26
100
VS = ±5V
24
22
VS = ±2.5V
20
VS = ±1.5V
18
5
Total Noise vs Total Source
Resistance
TA = 25°C
28
4
623012 G12
Warm-Up Drift vs Time
CHANGE IN OFFSET VOLTAGE (µV)
1.5
–5 –4 –3 –2 –1 0 1 2 3
OUTPUT VOLTAGE (V)
623012 G11
Offset Voltage vs Output Current
2.0
–2.5
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
OUTPUT VOLTAGE (V)
TOTAL NOISE (nV/√Hz)
1
1.5
2
OUTPUT VOLTAGE (V)
RL = 100Ω
–1.0
–2.0
0.5
RL = 1k
0
–1.5
0
VS = ±5V
TA = 25°C
2.0
1.5
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
Open-Loop Gain
2.5
VS = 5V, 0V
TA = 25°C
2.0
1.5
OFFSET VOLTAGE (mV)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 5V, 0V
OFFSET VOLTAGE (mV)
OUTPUT SATURATION VOLTAGE (V)
10
Output Short-Circuit Current
vs Power Supply Voltage
Minimum Supply Voltage
16
VS = ±2.5V
VCM = 0V
f = 100kHz
UNBALANCED
SOURCE
10 RESISTORS
TOTAL NOISE
RESISTOR NOISE
1
AMPLIFIER NOISE VOLTAGE
14
12
–2.0
–75 –60 –45 –30 –15 0 15 30 45 60 75
OUTPUT CURRENT (mA)
623012 G13
10
0
20
40 60 80 100 120 140 160
TIME AFTER POWER-UP (s)
623012 G14
0.1
10
100
1k
10k
SOURCE RESISTANCE (Ω)
100k
623012 G15
623012fc
11
LT6230/LT6230-10
LT6231/LT6232
Typical Performance Characteristics
(LT6230/LT6231/LT6232)
Noise Voltage and Unbalanced
Noise Current vs Frequency
4
3
3
NOISE CURRENT
2
2
1
1
100
10
CL = 5pF
RL = 1k
VCM = VS/2
100nV
–100nV
PHASE
GAIN (dB)
VS = ±5V
40
30
20
20
0
VS = ±5V
10
–20
GAIN
0
–40
VS = 3V, 0V
–10
–20
100k
1M
10M
100M
FREQUENCY (Hz)
1G
40
220
200
GAIN BANDWIDTH
180
160
–80
140
95
AV = 2
AV = 1
0.1
100M
623012 G22
125
120
AV = –1
110 RF = RG = 1k
100
VS = ±5V FALLING
90
80 VS = ±5V RISING
70
60
VS = ±2.5V FALLING
50
VS = ±2.5V RISING
40
30
2
0
10
12
8
6
TOTAL SUPPLY VOLTAGE (V)
4
20
–55 –35 –15
14
5 25 45 65 85 105 125
TEMPERATURE (°C)
623012 G21
Common Mode Rejection Ratio
vs Frequency
Channel Separation vs Frequency
–40
100
CHANNEL SEPARATION (dB)
AV = 10
1M
10M
FREQUENCY (Hz)
65
35
5
TEMPERATURE (°C)
623012 G20
COMMON MODE REJECTION RATIO (dB)
100
OUTPUT IMPEDANCE (Ω)
50
240
–60
VS = 5V, 0V
0.01
100k
–25
623012 G18
120
1
GAIN BANDWIDTH
Slew Rate vs Temperature
PHASE MARGIN
Output Impedance vs Frequency
10
VS = 3V, 0V
180
60
623012 G19
1k
200
PHASE MARGIN (DEG)
40
60
PHASE (dB)
VS = 3V, 0V
220
70
TA = 25°C
CL = 5pF
RL = 1k
GAIN BANDWIDTH (MHz)
CL = 5pF
RL = 1k
100
VCM = VS/2
80
50
40
VS = ±5V
Gain Bandwidth and Phase
Margin vs Supply Voltage
120
60
240
623012 G17
Open-Loop Gain vs Frequency
70
50
140
–55
5s/DIV
623012 G16
80
60
VS = ±5V
160
0
100k
1k
10k
FREQUENCY (Hz)
70
PHASE MARGIN
VS = 3V, 0V
SLEW RATE (V/µs)
0
NOISE VOLTAGE
VS = ±2.5V
PHASE MARGIN (DEG)
4
Gain Bandwidth and Phase
Margin vs Temperature
GAIN BANDWIDTH (MHz)
5
UNBALANCED NOISE CURRENT (pA/√Hz)
5
NOISE VOLTAGE (nV/√Hz)
6
VS = ±2.5V
TA = 25°C
VCM = 0V
100nV/DIV
6
0.1Hz to 10Hz Output Voltage
Noise
80
60
40
20
VS = 5V, 0V
VCM = VS/2
0
10k
100k
AV = 1
–50 TA = 25°C
VS = ±5V
–60
–70
–80
–90
–100
–110
–120
–130
1M
10M
FREQUENCY (Hz)
100M
1G
623012 G23
–140
100k
1M
10M
FREQUENCY (Hz)
100M
623012 G24
623012fc
12
LT6230/LT6230-10
LT6231/LT6232
Typical Performance Characteristics
(LT6230/LT6231/LT6232)
Power Supply Rejection Ratio
vs Frequency
VS = 5V, 0V
TA = 25°C
VCM = VS/2
80
POSITIVE SUPPLY
60
NEGATIVE SUPPLY
40
50
50
40
40
VS = 5V, 0V
45 AV = 2
35
RS = 10Ω
30
25
RS = 20Ω
20
15
RS = 50Ω
RL = 50Ω
10
20
OVERSHOOT (%)
100
1M
100k
FREQUENCY (Hz)
10k
10M
100M
100
CAPACITIVE LOAD (pF)
10
–
VOUT
500Ω
100
1mV
1mV
50
0
–4
–3
500Ω
150
2
1
0
OUTPUT STEP (V)
–2
–1
–
VIN
VOUT
+
100
1mV
1mV
50
10mV
10mV
10mV
3
0
4
–4
–3
10mV
–2
–1
1
2
0
OUTPUT STEP (V)
Distortion vs Frequency
RL = 100Ω, 2ND
RL = 1k, 2ND
–90
–70
–80
100k
1M
FREQUENCY (Hz)
AV = –1
9
AV = 2
8
7
6
5
4
V = ±5V
3 T S = 25°C
A
HD2, HD3 < –40dBc
2
100k
1M
10k
FREQUENCY (Hz)
623012 G30
Distortion vs Frequency
VS = ±2.5V
AV = 2
–50 VOUT = 2VP-P
RL = 100Ω, 3RD
RL = 100Ω, 2ND
RL = 1k, 2ND
10M
–70
623012 G31
RL = 100Ω, 2ND
–80
RL = 1k, 2ND
–90
100k
1M
FREQUENCY (Hz)
10M
623012 G32
RL = 100Ω, 3RD
–60
RL = 1k, 3RD
–100
10k
10M
–40
–90
RL = 1k, 3RD
–100
10k
4
DISTORTION (dBc)
DISTORTION (dBc)
–80
3
VS = ±5V
AV = 1
–50 VOUT = 2VP-P
–60
1000
10
–40
VS = ±2.5V
AV = 1
–50 VOUT = 2VP-P
–70
100
CAPACITIVE LOAD (pF)
623012 G27
Distortion vs Frequency
–40
RL = 100Ω, 3RD
10
623012 G29
623012 G28
–60
RS = 50Ω
RL = 50Ω
Maximum Undistorted Output
Signal vs Frequency
VS = ±5V
TA = 25°C
AV = –1
500Ω
SETTLING TIME (ns)
SETTLING TIME (ns)
200
+
15
Settling Time vs Output Step
(Inverting)
VS = ±5V
TA = 25°C
AV = 1
VIN
20
623012 G26
Settling Time vs Output Step
(Noninverting)
150
RS = 20Ω
25
0
1000
623012 G25
200
30
5
OUTPUT VOLTAGE SWING (VP-P)
1k
0
RS = 10Ω
35
10
5
0
DISTORTION (dBc)
Series Output Resistance and
Overshoot vs Capacitive Load
VS = 5V, 0V
45 AV = 1
OVERSHOOT (%)
POWER SUPPLY REJECTION RATIO (dB)
120
Series Output Resistance and
Overshoot vs Capacitive Load
–100
10k
RL = 1k, 3RD
100k
1M
FREQUENCY (Hz)
10M
623012 G33
623012fc
13
LT6230/LT6230-10
LT6231/LT6232
Typical Performance Characteristics
(LT6230/LT6231/LT6232)
Distortion vs Frequency
Large-Signal Response
Small-Signal Response
–40
2V
RL = 100Ω, 2ND
RL = 1k, 3RD
–70
50mV/DIV
–60
RL = 100Ω, 3RD
1V/DIV
DISTORTION (dBc)
VS = ±5V
AV = 2
–50 VOUT = 2VP-P
0V
0V
–2V
–80
–90
RL = 1k, 2ND
–100
10k
100k
1M
FREQUENCY (Hz)
10M
623012 G35
200ns/DIV
VS = ±2.5V
AV = –1
RL = 1k
VS = ±2.5V
AV = 1
RL = 1k
200ns/DIV
623012 G36
623012 G34
2V/DIV
5V
0V
–5V
VS = ±5V
AV = 1
RL = 1k
VIN
1V/DIV
Output Overdrive Recovery
0V
VOUT
2V/DIV
Large-Signal Response
0V
623012 G37
200ns/DIV
VS = ±2.5V
AV = 3
200ns/DIV
623012 G38
(LT6230) ENABLE Characteristics
ENABLE Pin Current
vs ENABLE Pin Voltage
4.5
30
TA = 125°C
25
TA = 25°C
3.0
2.5
TA = –55°C
2.0
1.5
1.0
0.5
0
TA = –55°C
VS = ±2.5V
AV = 1
20 TA = 25°C
15 T = 125°C
A
VOUT
3.5
ENABLE PIN CURRENT (µA)
SUPPLY CURRENT (mA)
4.0
ENABLE Pin Response Time
10
5
VS = ±2.5V
–2.0
0
1.0
–1.0
PIN VOLTAGE (V)
2.0
623012 G39
ENABLE PIN
Supply Current
vs ENABLE Pin Voltage
0
–2.0
0
1.0
–1.0
PIN VOLTAGE (V)
2.0
5V
0V
0.5V
0V
VS = ±2.5V
VIN = 0.5V
AV = 1
RL = 1k
100µs/DIV
623012 G41
623012 G40
623012fc
14
LT6230/LT6230-10
LT6231/LT6232
Typical Performance Characteristics
(LT6230-10)
Gain Bandwidth and Phase
Margin vs Temperature
600
1100
VS = 3V, 0V
900
80
VS = ±5V
70
PHASE MARGIN
60
–50
–25
0
50
75
25
TEMPERATURE (°C)
100
400
VS = ±5V RISING
300
40
100
–55 –35 –15
PHASE
20
1M
–20
VS = ±5V
AV = 10
CL = 5pF
RL = 1k
VCM = VS/2
–10
100k
0
–40
TA = 25°C
AV = 10
1450 CL = 5pF
RL = 1k
1200
GAIN BANDWIDTH
950
100
PHASE MARGIN
50
–60
10M
100M
FREQUENCY (Hz)
1G
–80
0
2
4
8
10
6
TOTAL SUPPLY VOLTAGE (V)
623012 G45
60
40
20
100k
1M
10M
FREQUENCY (Hz)
100M
800
600
400
200
0
0
0
1G
623012 G48
–40
VS = ±2.5V
AV = 10
–50 VOUT = 2VP-P
9
8
7
6
5
4
3
2 VS = ±5V
TA = 25°C
1 AV = 10
HD2 = HD3 ≤ 40dBc
0
100k
1M
10M
10k
FREQUENCY (Hz)
1000
400
800
600
TOTAL RESISTOR LOAD (Ω)
(INCLUDES FEEDBACK R) 623012 G47
200
2nd and 3rd Harmonic Distortion
vs Frequency
10
OUTPUT VOLTAGE SWING (VP-P)
COMMON MODE REJECTION RATIO (dB)
80
0
10k
1000
Maximum Undistorted Output
Signal vs Frequency
VS = 5V, 0V
VCM = VS/2
100
12
1200
623012 G46
Common Mode Rejection Ratio
vs Frequency
120
ASV = ±5V
10
V
TA = 25°C
RF = 1k
RG = 100
1400
DISTORTION (dBc)
0
20
GAIN BANDWIDTH (MHz)
GAIN (dB)
40
VS = 3V, 0V
30
60
10000
Gain Bandwidth vs Resistor Load
1600
PHASE MARGIN (DEG)
40
80
PHASE (DEG)
GAIN
50
10
100
VS = 3V, 0V
100
1000
CAPACITIVE LOAD (pF)
10
623012 G44
1700
120
60
0
5 25 45 65 85 105 125
TEMPERATURE (°C)
Gain Bandwidth and Phase
Margin vs Supply Voltage
90
VS = ±5V
RS = 50Ω
20
623012 G43
Open-Loop Gain and Phase
vs Frequency
70
30
10
623012 G42
80
RS = 20Ω
40
VS = ±2.5V FALLING
150
RS = 10Ω
50
VS = ±2.5V RISING
200
125
VS = ±5V FALLING
350
250
VS = 5V, 0V
AV = 10
60
450
50
VS = 3V, 0V
70
OVERSHOOT (%)
GAIN BANDWIDTH
1300
PHASE MARGIN (DEG)
GAIN BANDWIDTH (MHz)
AV = –10
550 RF = 1k
RG = 100W
500
VS = ±5V
GAIN BANDWIDTH (MHz)
AV = 10
1500
SLEW RATE (V/µs)
1700
Series Output Resistor and
Overshoot vs Capacitive Load
Slew Rate vs Temperature
–60
–70
–80
RL = 100Ω, 2ND
RL = 100Ω, 3RD
RL = 1k, 3RD
RL = 1k, 2ND
–90
100M
623012 G49
–100
10k
100k
1M
FREQUENCY (Hz)
10M
623012 G50
623012fc
15
LT6230/LT6230-10
LT6231/LT6232
Typical Performance Characteristics
(LT6230-10)
2nd and 3rd Harmonic Distortion
vs Frequency
Large-Signal Response
Output-Overload Recovery
–40
RL = 100Ω, 3RD
RL = 100Ω, 2ND
–70
0V
RL = 1k, 3RD
–80
RL = 1k, 2ND
–90
–100
10k
VIN
VOUT
0.5V/DIV 2V/DIV
–60
VOUT
2V/DIV
DISTORTION (dBc)
VS = ±5V
AV = 10
–50 VOUT = 2VP-P
100k
1M
FREQUENCY (Hz)
10M
VS = ±5V
AV = 10
RF = 900Ω
RG = 100Ω
623012 G52
100ns/DIV
0V
0V
VS = 5V, 0V
AV = 10
RF = 900Ω
RG = 100Ω
100ns/DIV
623012 G53
623012 G51
Input Referred High Frequency
Noise Spectrum
Small-Signal Response
1nV/√Hz/DIV
VOUT
100mV/DIV
10
2.5V
VS = 5V, 0V
AV = 10
RF = 900Ω
RG = 100Ω
100ns/DIV
623012 G54
0
100kHz
5MHz/DIV
50MHz
623012 G55
623012fc
16
LT6230/LT6230-10
LT6231/LT6232
Applications Information
Amplifier Characteristics
be limited to ±40mA. This implies 25Ω of protection resistance is necessary per volt of overdrive beyond ±0.7V.
These input diodes are rugged enough to handle transient
currents due to amplifier slew rate overdrive and clipping
without protection resistors.
Figure 1 is a simplified schematic of the LT6230/LT6231/
LT6232, which has a pair of low noise input transistors
Q1 and Q2. A simple current mirror, Q3/Q4, converts the
differential signal to a single-ended output, and these
transistors are degenerated to reduce their contribution
to the overall noise.
The photo of Figure 2 shows the output response to an
input overdrive with the amplifier connected as a voltage
follower. With the input signal low, current source I1 saturates and the differential drive generator drives Q6 into
saturation so the output voltage swings all the way to V–.
The input can swing positive until transistor Q2 saturates
into current mirror Q3/Q4. When saturation occurs, the
output tries to phase invert, but diode D2 conducts current
from the signal source to the output through the feedback
connection. The output is clamped a diode drop below the
input. In this photo, the input signal generator is limiting
at about 20mA.
Capacitor C1 reduces the unity-cross frequency and improves the frequency stability without degrading the gain
bandwidth of the amplifier. Capacitor CM sets the overall
amplifier gain bandwidth. The differential drive generator
supplies current to transistors Q5 and Q6 that swing the
output from rail-to-rail.
Input Protection
There are back-to-back diodes, D1 and D2 across the + and
– inputs of these amplifiers to limit the differential input
voltage to ±0.7V. The inputs of the LT6230/LT6231/LT6232
do not have internal resistors in series with the input transistors. This technique is often used to protect the input
devices from overvoltage that causes excessive current
to flow. The addition of these resistors would significantly
degrade the low noise voltage of these amplifiers. For
instance, a 100Ω resistor in series with each input would
generate 1.8nV/√Hz of noise, and the total amplifier noise
voltage would rise from 1.1nV/√Hz to 2.1nV/√Hz. Once
the input differential voltage exceeds ±0.7V, steady-state
current conducted through the protection diodes should
1V/DIV
2.5V
0V
–2.5V
500µs/DIV
623012 F02
Figure 2. VS = ±2.5V, AV = 1 with Large Overdrive
+V
Q3
–V
+V
DESD1
Q4
C1
DESD2
Q1
D1
DESD5
VOUT
DESD6
DIFFERENTIAL
DRIVE GENERATOR
–V
–VIN
Q5
CM
+V
–V
Q2
Q6
D2
+V
+VIN
DESD3
DESD4
–V
I1
BIAS
ENABLE
+V
–V
623012 F01
Figure 1. Simplified Schematic
623012fc
17
LT6230/LT6230-10
LT6231/LT6232
Applications Information
With the amplifier connected in a gain of AV ≥ 2, the output
can invert with very heavy overdrive. To avoid this inversion, limit the input overdrive to 0.5V beyond the power
supply rails.
ESD
The LT6230/LT6231/LT6232 have reverse-biased ESD
protection diodes on all inputs and outputs as shown in
Figure 1. If these pins are forced beyond either supply,
unlimited current will flow through these diodes. If the
current is transient and limited to one hundred milliamps
or less, no damage to the device will occur.
Noise
The noise voltage of the LT6230/LT6231/LT6232 is equivalent to that of a 75Ω resistor, and for the lowest possible
noise it is desirable to keep the source and feedback resistance at or below this value, i.e., RS + RG||RFB ≤ 75Ω. With
RS + RG||RFB = 75Ω the total noise of the amplifier is:
eN=√(1.1nV)2+(1.1nV)2 = 1.55nV/√Hz
Below this resistance value, the amplifier dominates the
noise, but in the region between 75Ω and about 3k, the
noise is dominated by the resistor thermal noise. As the
total resistance is further increased beyond 3k, the amplifier
noise current multiplied by the total resistance eventually
dominates the noise.
The product of eN • √ISUPPLY is an interesting way to
gauge low noise amplifiers. Most low noise amplifiers
with low eN have high ISUPPLY current. In applications that
require low noise voltage with the lowest possible supply
current, this product can prove to be enlightening. The
LT6230/LT6231/LT6232 have an eN • √ISUPPLY product of
only 1.9 per amplifier, yet it is common to see amplifiers
with similar noise specifications to have eN • √ISUPPLY as
high as 13.5.
For a complete discussion of amplifier noise, see the
LT1028 data sheet.
ENABLE Pin
The LT6230 includes an ENABLE pin that shuts down the
amplifier to 10µA maximum supply current. The ENABLE
pin must be driven low to operate the amplifier with normal
supply current. The ENABLE pin must be driven high to
within 0.35V of V+ to shut down the supply current. This
can be accomplished with simple gate logic; however
care must be taken if the logic and the LT6230 operate
from different supplies. If this is the case, then open-drain
logic can be used with a pull-up resistor to ensure that
the amplifier remains off. See the Typical Performance
Characteristics.
The output leakage current when disabled is very low;
however, current can flow into the input protection diodes
D1 and D2 if the output voltage exceeds the input voltage
by a diode drop.
623012fc
18
LT6230/LT6230-10
LT6231/LT6232
Typical Applications
Single Supply, Low Noise, Low Power, Bandpass Filter with Gain = 10
R1
732Ω
Frequency Response Plot of
Bandpass Filter
C2
47pF
f0 =
V+
23
1 = 1MHz
2πRC
C = √C1C2, R = R1 = R2
VIN
R2
732Ω
(
0.1µF
R3
10k
–
LT6230
+
C3
0.1µF
R4
10k
VOUT
EN
)
f0 = 732Ω MHz, MAXIMUM f0 = 1MHz
R
f–3dB = f0
2.5
AV = 20dB at f0
EN = 4µVRMS INPUT REFERRED
IS = 3.7mA FOR V+ = 5V
GAIN (dB)
C1
1000pF
3
623012 F03
–7
100k
1M
FREQUENCY (Hz)
10M
623012 F04
Low Noise, Low Power, Single Supply, Instrumentation Amplifier with Gain = 100
R1
30.9Ω
C2
2200pF
R2
V+ 511Ω
C8
68pF
–
U1
LT6230-10
+
VIN1
C1
1µF
R15
88.7Ω
EN
R13
2k
–
R6
511Ω
R3
30.9Ω
R5
511Ω
R4
V+ 511Ω
U2
LT6230-10
+
VIN2
C3
1µF
R16
88.7Ω
R12
511Ω
R14
2k
–
EN
V+
R10
511Ω
+
C9
68pF
U3
LT6230
VOUT
EN
C4
10µF
VOUT = 100 (VIN2 – VIN1)
(
R10
) (R15
)
GAIN = R2 + 1
R1
INPUT RESISTANCE = R5 = R6
f–3dB = 310Hz TO 11MHz
EN = 20µVRMS INPUT REFERRED
IS = 10.5mA FOR VS = 5V, 0V
R1 = R3
R2 = R4
R10 = R12
R15 = R16
623012 F05
623012fc
19
LT6230/LT6230-10
LT6231/LT6232
Package Description
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62
MAX
2.90 BSC
(NOTE 4)
0.95
REF
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC
S6 TSOT-23 0302 REV B
623012fc
20
LT6230/LT6230-10
LT6231/LT6232
Package Description
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
0.70 ±0.05
3.5 ±0.05
1.65 ±0.05
2.10 ±0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
PIN 1
TOP MARK
(NOTE 6)
0.200 REF
3.00 ±0.10
(4 SIDES)
R = 0.125
TYP
5
0.40 ± 0.10
8
1.65 ± 0.10
(2 SIDES)
0.75 ±0.05
4
0.25 ± 0.05
1
(DD8) DFN 0509 REV C
0.50 BSC
2.38 ±0.10
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
623012fc
21
LT6230/LT6230-10
LT6231/LT6232
Package Description
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
7
8
.245
MIN
.160 ±.005
5
6
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
× 45°
(0.254 – 0.508)
3
2
4
.053 – .069
(1.346 – 1.752)
.008 – .010
(0.203 – 0.254)
.004 – .010
(0.101 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
1. DIMENSIONS IN
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)
SO8 0303
GN Package
16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
.189 – .196*
(4.801 – 4.978)
.045 ±.005
16 15 14 13 12 11 10 9
.254 MIN
.009
(0.229)
REF
.150 – .165
.229 – .244
(5.817 – 6.198)
.0165 ±.0015
.150 – .157**
(3.810 – 3.988)
.0250 BSC
RECOMMENDED SOLDER PAD LAYOUT
1
.015 ± .004
× 45°
(0.38 ± 0.10)
.007 – .0098
(0.178 – 0.249)
.0532 – .0688
(1.35 – 1.75)
2 3
4
5 6
7
8
.004 – .0098
(0.102 – 0.249)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. CONTROLLING DIMENSION: INCHES
INCHES
2. DIMENSIONS ARE IN
(MILLIMETERS)
.008 – .012
(0.203 – 0.305)
TYP
.0250
(0.635)
BSC
GN16 (SSOP) 0204
3. DRAWING NOT TO SCALE
*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
623012fc
22
LT6230/LT6230-10
LT6231/LT6232
Revision History
(Revision history begins at Rev C)
REV
DATE
DESCRIPTION
PAGE NUMBER
C
1/11
Updated ENABLE Pin section in Applications Information
18
623012fc
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.
23
LT6230/LT6230-10
LT6231/LT6232
Typical Applications
The LT6230 is applied as a transimpedance amplifier with
an I-to-V conversion gain of 1.5kΩ set by R1. The LT6230
is ideally suited to this application because of its low
input offset voltage and current, and its low noise. This is
because the 1.5k resistor has an inherent thermal noise
of 5nV/√Hz or 3.4pA/√Hz at room temperature, while the
LT6230 contributes only 1.1nV and 2.4pA /√Hz. So, with
respect to both voltage and current noises, the LT6230 is
actually quieter than the gain resistor.
The circuit uses an avalanche photodiode with the cathode
biased to approximately 200V. When light is incident on
the photodiode, it induces a current IPD which flows into
the amplifier circuit. The amplifier output falls negative
to maintain balance at its inputs. The transfer function
is therefore VOUT = –IPD • 1.5k. C1 ensures stability and
good settling characteristics. Output offset was measured
at 280µV, so low in part because R2 serves to cancel the
DC effects of bias current. Output noise was measured
at 1.1mVP-P on a 100MHz measurement bandwidth, with
C2 shunting R2’s thermal noise. As shown in the scope
photo, the rise time is 17ns, indicating a signal bandwidth
of 20MHz.
Low Power Avalanche Photodiode Transimpedance Amplifier
IS = 3.3mA
≈200V BIAS
C1
4.7pF
WWW.ADVANCEDPHOTONIX.COM
30mV/DIV
ADVANCED PHOTONIX
012-70-62-541
R1
1.5k
5V
–
R2
1.5k
Photodiode Amplifier Time Domain Response
LT6230
+
–5V
50ns/DIV
ENABLE
623012 TA02b
623012 TA02a
C2
0.1µF
OUTPUT OFFSET = 500µV TYPICAL
BANDWIDTH = 20MHz
OUTPUT NOISE = 1.1mVP-P (100MHz MEASUREMENT BW)
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LT1028
Single, Ultralow Noise 50MHz Op Amp
0.85nV/√Hz
LT1677
Single, Low Noise Rail-to-Rail Amplifier
3V Operation, 2.5mA, 4.5nV/√Hz, 60µV Max VOS
LT1806/LT1807
Single/Dual, Low Noise 325MHz Rail-to-Rail Amplifier
2.5V Operation, 550µV Max VOS, 3.5nV/√Hz
LT6200/LT6201
Single/Dual, Low Noise 165MHz
0.95nV√Hz, Rail-to-Rail Input and Output
LT6202/LT6203/LT6204
Single/Dual/Quad, Low Noise, Rail-to-Rail Amplifier
1.9nV/√Hz, 3mA Max, 100MHz Gain Bandwidth
623012fc
24 Linear Technology Corporation
LT 0111 REV C • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2003