Gain Bandwidth Product:
LT6230: 215MHz; AV ≥ 1
LT6230-10: 1450MHz; AV ≥ 10
■
Wide Supply Range: 3V to 12.6V
■
Output Swings Rail-to-Rail
■
Common Mode Rejection Ratio 115dB Typ
■
Output Current: 30mA
■
Operating Temperature Range –40°C to 85°C
■
LT6230 Shutdown to 10µA Maximum
■
LT6230/LT6230-10 in SOT-23 Package
■
Dual LT6231 in 8-Pin SO and Tiny DFN Packages
■
LT6232 in 16-Pin SSOP Package
U
APPLICATIOS
■
Ultrasound Amplifiers
■
Low Noise, Low Power Signal Processing
■
Active Filters
■
Driving A/D Converters
■
Rail-to-Rail Buffer Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
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 gain
bandwidth 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.
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 • √I
SUPPLY
product of 1.9 per
amplifier is among the most noise efficient of any op amp.
The LT6230/LT6230-10 is 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.
TYPICAL APPLICATIO
Low Noise Low Power Instrumentation Amplifier
+
V
S
IN
IN
+
–
+
1/2 LT6231
–
R1
10Ω
–
1/2 LT6231
+
R2
196Ω
R3
196Ω
–
V
S
R4
499Ω
R5
499Ω
AV = 40
BW = 5.1MHz
= ±1.5V to ±5V
V
S
U
R6
499Ω
+
V
S
+
LT6202
–
–
V
S
499Ω
= 10mA
I
S
= 5.8µV
E
N
MEASUREMENT BW = 8MHz
V
OUT
R7
INPUT REFERRED,
RMS
623012 TA01a
Noise Voltage and Unbalanced
Noise Current vs Frequency
6
5
4
3
2
NOISE VOLTAGE (nV/√Hz)
1
0
101k10k100k
100
FREQUENCY (Hz)
VS = ±2.5V
T
A
V
CM
NOISE CURRENT
NOISE VOLTAGE
= 25°C
= 0V
623012 TA01b
6
UNBALANCED NOISE CURRENT (pA/√Hz)
5
4
3
2
1
0
sn623012 623012fas
1
LT6230/LT6230-10/
TOP VIEW
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OUT A
–IN A
+IN A
V
+
+IN B
–IN B
OUT B
NC
OUT D
–IN D
+IN D
V
–
+IN C
–IN C
OUT C
NC
+
–
+
–
+
–
+
–
A
D
BC
LT6231/LT6232
WW
W
ABSOLUTE AXIU RATIGS
U
(Note 1)
Total Supply Voltage (V+ to V–) ............................ 12.6V
Input Current (Note 2) ........................................ ±40mA
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
ORDER PART
TOP VIEW
V
1OUT A
–IN A
2
–
+IN A
8-LEAD (3mm × 3mm) PLASTIC DFN
UNDERSIDE METAL CONNECTED TO V
+
3
–
V
4
DD PACKAGE
T
= 125°C, θJA = 160°C/W
JMAX
(PCB CONNECTION OPTIONAL)
8
OUT B
7
–IN B
6
–
+
+IN B
5
+
–
NUMBER
LT6231CDD
LT6231IDD
DD PART
MARKING*
LAEU
OUT A
–IN A
+IN A
*The temperature grade is identified by a label on the shipping container.Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
1
2
–
+
3
–
V
4
S8 PACKAGE
8-LEAD PLASTIC SO
T
= 150°C, θJA = 200°C/W
JMAX
TOP VIEW
ORDER PART
NUMBER
+
V
8
OUT B
7
–IN B
6
–
+
+IN B
5
LT6231CS8
LT6231IS8
S8 PART
MARKING
6231
6231I
T
= 150°C, θJA = 135°C/W
JMAX
ORDER PART
NUMBER
LT6232CGN
LT6232IGN
GN PART
MARKING
6232
6232I
sn623012 623012fas
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = V
= half supply,
OUT
ENABLE = 0V, unless otherwise noted.
SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS
V
OS
I
B
I
OS
e
n
i
n
C
IN
A
VOL
V
CM
CMRRCommon Mode Rejection RatioVS = 5V, V
PSRRPower Supply Rejection RatioVS = 3V to 10V90115dB
V
OL
V
OH
I
SC
I
S
Input Offset VoltageLT6230S6, LT6230S6-10100500µV
LT6231S8, LT6232GN50350µV
LT6231DD75450µV
Input Offset Voltage Match100600µV
(Channel-to-Channel) (Note 6)
Input Bias Current510 µA
IB Match (Channel-to-Channel) (Note 6)0.10.9µA
Input Offset Current0.10.6µA
Input Noise Voltage0.1Hz to 10Hz180nV
P-P
Input Noise Voltage Densityf = 10kHz, VS = 5V1.11.7nV/√Hz
Input Noise Current Density, Balanced Sourcef = 10kHz, VS = 5V, RS = 10k1pA/√Hz
Unbalanced Sourcef = 10kHz, V
= 5V, RS = 10k2.4pA/√Hz
S
Input ResistanceCommon Mode6.5MΩ
Differential Mode7.5kΩ
Input CapacitanceCommon Mode2.9pF
Differential Mode7.7pF
Large-Signal GainVS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2105200V/mV
= 1k to VS/22140V/mV
R
V
= 1V to 4V,RL = 100Ω to VS/25.49V/mV
O
L
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/290175V/mV
= 1k to VS/216.532V/mV
R
L
Input Voltage RangeGuaranteed by CMRR, VS = 5V, 0V1.54V
= 3.3V, 0V1.152.65V
V
S
= 1.5V to 4V90115dB
= 3.3V, V
S
CM
= 1.15V to 2.65V90115dB
CM
V
CMRR Match (Channel-to-Channel) (Note 6)VS = 5V, VCM = 1.5V to 4V84120dB
PSRR Match (Channel-to-Channel) (Note 6)VS = 3V to 10V84115dB
Minimum Supply Voltage (Note 7)3V
Output Voltage Swing LOW (Note 8)No Load440mV
= 5mA85190mV
I
SINK
V
= 5V, I
S
= 3.3V, I
V
S
= 20mA240460mV
SINK
= 15mA185350mV
SINK
Output Voltage Swing HIGH (Note 8)No Load550mV
= 5mA90200mV
I
SOURCE
V
= 5V, I
S
= 3.3V, I
V
S
= 20mA325600mV
SOURCE
= 15mA250400mV
SOURCE
Short-Circuit CurrentVS = 5V±30±45mA
= 3.3V±25±40mA
V
S
Supply Current per Amplifier3.153.5mA
Disabled Supply Current per AmplifierENABLE = V
+
– 0.35V0.210µA
sn623012 623012fas
3
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = V
= half supply,
OUT
ENABLE = 0V, unless otherwise noted.
SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS
I
ENABLE
V
L
V
H
ENABLE Pin CurrentENABLE = 0.3V–25–75µA
ENABLE Pin Input Voltage LOW0.3V
ENABLE Pin Input Voltage HIGH V+ – 0.35VV
Output Leakage CurrentENABLE = V+ – 0.35V, VO = 1.5V to 3.5V0.210µA
t
t
ON
OFF
Turn-On TimeENABLE = 5V to 0V, RL = 1k, VS = 5V300ns
Turn-Off TimeENABLE = 0V to 5V, RL = 1k, VS = 5V41µs
GBWGain Bandwidth ProductFrequency = 1MHz, VS = 5V200MHz
LT6230-101300MHz
SRSlew RateVS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V4260V/µs
LT6230-10, VS = 5V, AV = –10, RL = 1k,250V/µs
V
= 1.5V to 3.5V
O
FPBWFull Power BandwidthVS = 5V, V
OUT
= 3V
(Note 9)4.86.3MHz
P-P
LT6230-10, HD2 = HD3 = ≤ 1%11MHz
t
S
The ● denotes the specifications which apply over 0°C < TA < 70°C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = V
Settling Time (LT6230, LT6231, LT6232)0.1%, VS = 5V, V
= 2V, AV = –1, RL = 1k55ns
STEP
OUT
= half
supply, ENABLE = 0V, unless otherwise noted.
SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS
V
OS
VOS TCInput Offset Voltage Drift (Note 10)V
I
B
I
OS
A
VOL
V
CM
CMRRCommon Mode Rejection RatioVS = 5V, V
PSRRPower Supply Rejection RatioVS = 3V to 10V●85dB
V
OL
Input Offset VoltageLT6230S6, LT6230S6-10●600µV
LT6231S8, LT6232GN
LT6231DD
●450µV
●550µV
Input Offset Voltage Match●800µV
(Channel-to-Channel) (Note 6)
= Half Supply●0.53µV/°C
CM
Input Bias Current●11µA
IB Match (Channel-to-Channel) (Note 6)●1µA
Input Offset Current●0.7µA
Large-Signal GainVS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2●78V/mV
= 1k to VS/2●17V/mV
R
= 1V to 4V,RL = 100Ω to VS/2●4.1V/mV
V
O
L
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2●66V/mV
R
= 1k to VS/2●13V/mV
L
Input Voltage RangeGuaranteed by CMRR, VS = 5V, 0V●1.54V
V
= 3.3V, 0V●1.152.65V
S
= 1.5V to 4V●90dB
CM
= 3.3V, V
V
S
= 1.15V to 2.65V●85dB
CM
CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V●84dB
PSRR Match (Channel-to-Channel) (Note 6)VS = 3V to 10V●79dB
Minimum Supply Voltage (Note 7)●3V
Output Voltage Swing LOW (Note 8)No Load●50mV
= 5mA●200mV
I
SINK
= 5V, I
V
S
V
= 3.3V, I
S
= 20mA●500mV
SINK
= 15mA●380mV
SINK
4
sn623012 623012fas
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = V
The ● denotes the specifications which apply over 0°C < TA < 70°C
= half supply, ENABLE = 0V, unless otherwise noted.
OUT
SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS
V
OH
I
SC
I
S
I
ENABLE
V
L
V
H
Output Voltage Swing HIGH (Note 8)No Load●60mV
I
= 5mA●215mV
SOURCE
= 5V, I
V
S
= 3.3V, I
V
S
= 20mA●650mV
SOURCE
= 15mA●430mV
SOURCE
Short-Circuit CurrentVS = 5V●±25mA
= 3.3V●±20mA
V
S
Supply Current per Amplifier●4.2mA
Disabled Supply Current per AmplifierENABLE = V
+
– 0.25V●1µA
ENABLE Pin CurrentENABLE = 0.3V●–85µA
ENABLE Pin Input Voltage LOW●0.3V
ENABLE Pin Input Voltage HIGH● V+ – 0.25VV
Output Leakage CurrentENABLE = V+ – 0.25V, VO = 1.5V to 3.5V●1µA
t
t
ON
OFF
Turn-On TimeENABLE = 5V to 0V, RL = 1k, VS = 5V●300ns
Turn-Off TimeENABLE = 0V to 5V, RL = 1k, VS = 5V●65µs
SRSlew RateVS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V●35V/µs
LT6230-10, AV = –10, RL = 1k,●225V/µs
= 1.5V to 3.5V
V
O
FPBWFull Power Bandwidth (Note 9)VS = 5V, V
OUT
= 3V
P-P
●3.7MHz
LT6230, LT6231, LT6232
The ● denotes the specifications which apply over –40°C < TA < 85°C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = V