FEATURES
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LTC6655/LTC6655LN
0.25ppm Noise, Low Drift
Precision References
DESCRIPTION
The
LTC
®
6655
is a complete family of precision bandgap
voltage references, offering exceptional noise and drift
performance. This low noise and drift is ideally suited
for the high resolution measurements required by instru-
mentation and test equipment. In addition, the LTC6655
is fully specified over the temperature range of –40°C
to 125°C, ensuring its suitability for demanding auto-
motive and industrial applications. Advanced curvature
compensation allows this bandgap reference to achieve a
drift of less than 2ppm/°C with a predictable temperature
characteristic and an output voltage accurate to ±0.025%,
reducing or eliminating the need for calibration.
The LTC6655LN Low Noise comes with a noise reduction
pin that enables reduction of wideband noise with the
addition of a single capacitor.
The LTC6655 can be powered from as little as 500mV
above the output voltage to as much as 13.2V. Superior
load regulation with source and sink capability, coupled
with exceptional line rejection, ensures consistent per-
formance over a wide range of operating conditions. A
shutdown mode is provided for low power applications.
The LTC6655 references are offered in an 8-lead MSOP
package and an 8-lead LS8 package. The LS8 is a
5mm
×
5mm surface mount hermetic package that pro-
vides outstanding stability.
All registered trademarks and trademarks are the property of their respective owners.
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Low Noise:
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0.25ppm
P-P
(0.1Hz to 10Hz) 625nV
P-P
for the
LTC6655-2.5
n
0.21ppm
RMS
(10Hz to 1kHz) for the LTC6655LN
C
NR
= 100µF
Low Drift: 2ppm/°C Max
High Accuracy: ±0.025% Max
No Humidity Sensitivity (LS8 Package)
Thermal Hysteresis (LS8): 30ppm (–40°C to 85°C)
Long-Term Drift (LS8): 20ppm/√kHr
100% Tested at –40°C, 25°C and 125°C
Load Regulation: <10ppm/mA
Sinks and Sources Current: ±5mA
Low Dropout: 500mV
Maximum Supply Voltage: 13.2V
Low Power Shutdown: <20µA Max
Available Output Voltages: 1.25V, 2.048V, 2.5V, 3V,
3.3V, 4.096V, 5V
Available in an 8-Lead MSOP and High Stability
Hermetic 5mm
×
5mm LS8 Packages
Instrumentation and Test Equipment
High Resolution Data Acquisition Systems
Weigh Scales
Precision Battery Monitors
Precision Regulators
Medical Equipment
APPLICATIONS
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TYPICAL APPLICATION
Basic Connection
3V < V
IN
≤ 13.2V
C
IN
0.1µF
LTC6655-2.5
V
IN
V
OUT_F
SHDN
V
OUT_S
GND
V
OUT
C
OUT
10µF
6655 TA01a
Low Frequency 0.1Hz to 10Hz Noise (LTC6655-2.5)
Basic Connection with Noise Reduction
3V < V
IN
≤ 13.2V
C
IN
0.1µF
LTC6655LN-2.5
V
IN
V
OUT
SHDN
GND
NR
C
NR
10µF
V
OUT
C
OUT
10µF
6655 TA01c
500nV/DIV
1s/DIV
6655 TA01b
Rev. J
Document Feedback
For more information
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1
LTC6655/LTC6655LN
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage
V
IN
to GND .......................................... –0.3V to 13.2V
SHDN
to GND ........................... –0.3V to (V
IN
+ 0.3V)
Output Voltage:
V
OUT_F
....................................... –0.3V to (V
IN
+ 0.3V)
V
OUT_S
..................................................... –0.3V to 6V
NR ........................................................... –0.3V to 6V
Output Short-Circuit Duration ...................... Indefinite
Operating Temperature Range (Note 2).. –40°C to 125°C
Storage Temperature Range (Note 2)..... –65°C to 150°C
Lead Temperature Range (Soldering, 10 sec)
(Note 3) ................................................................. 300°C
PIN CONFIGURATION
LTC6655
SHDN
V
IN
GND
GND
1
2
3
4
TOP VIEW
8
7
6
5
GND
V
OUT_F
V
OUT_S
GND
LTC6655LN
SHDN
V
IN
GND
GND
1
2
3
4
TOP VIEW
8
7
6
5
GND
V
OUT_F
NR
GND
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 300°C/W
STAR ALL GND CONNECTIONS AT PIN 4
LTC6655
TOP VIEW
GND
SHDN
V
IN
GND
1
2
3
4
GND
LS8 PACKAGE
8-PIN LEADLESS CHIP CARRIER (5mm
×
5mm)
T
JMAX
= 150°C,
θ
JA
= 120°C/W
STAR ALL GND CONNECTIONS AT PIN 4
8
7
6
5
V
OUT_F
V
OUT_S
GND
LTC6655LN
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 300°C/W
STAR ALL GND CONNECTIONS AT PIN 4
TOP VIEW
GND
SHDN
V
IN
GND
1
2
3
4
GND
LS8 PACKAGE
8-PIN LEADLESS CHIP CARRIER (5mm
×
5mm)
T
JMAX
= 150°C,
θ
JA
= 120°C/W
STAR ALL GND CONNECTIONS AT PIN 4
8
7
6
5
V
OUT
NR
GND
Rev. J
2
For more information
www.analog.com
LTC6655/LTC6655LN
ORDER INFORMATION
PART
SPECIFIED TEMPERATURE
LEAD FREE FINISH
TAPE AND REEL
MARKING* PACKAGE DESCRIPTION
RANGE
LTC6655BHMS8-1.25#PBF
LTC6655BHMS8-1.25#TRPBF
LTFDG
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655CHMS8-1.25#PBF
LTC6655CHMS8-1.25#TRPBF
LTFDG
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655BHMS8-2.048#PBF
LTC6655BHMS8-2.048#TRPBF
LTFDH
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655CHMS8-2.048#PBF
LTC6655CHMS8-2.048#TRPBF
LTFDH
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655BHMS8-2.5#PBF
LTC6655BHMS8-2.5#TRPBF
LTFCY
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655CHMS8-2.5#PBF
LTC6655CHMS8-2.5#TRPBF
LTFCY
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655BHMS8-3#PBF
LTC6655BHMS8-3#TRPBF
LTFDJ
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655CHMS8-3#PBF
LTC6655CHMS8-3#TRPBF
LTFDJ
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655BHMS8-3.3#PBF
LTC6655BHMS8-3.3#TRPBF
LTFDK
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655CHMS8-3.3#PBF
LTC6655CHMS8-3.3#TRPBF
LTFDK
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655BHMS8-4.096#PBF
LTC6655BHMS8-4.096#TRPBF
LTFDM
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655CHMS8-4.096#PBF
LTC6655CHMS8-4.096#TRPBF
LTFDM
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655BHMS8-5#PBF
LTC6655BHMS8-5#TRPBF
LTFDN
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655CHMS8-5#PBF
LTC6655CHMS8-5#TRPBF
LTFDN
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655LNBHMS8-2.5#PBF
LTC6655LNBHMS8-2.5#TRPBF
LTHFK
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655LNCHMS8-2.5#PBF
LTC6655LNCHMS8-2.5#TRPBF
LTHFK
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655LNBHMS8-4.096#PBF LTC6655LNBHMS8-4.096#TRPBF LTHFM
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655LNCHMS8-4.096#PBF LTC6655LNCHMS8-4.096#TRPBF LTHFM
8-Lead Plastic MSOP
–40°C to 125°C
†
LTC6655LNBHMS8-5#TRPBF
LTHFN
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655LNBHMS8-5#PBF
LTC6655LNCHMS8-5#TRPBF
LTHFN
8-Lead Plastic MSOP
–40°C to 125°C
LTC6655LNCHMS8-5#PBF
†
†
N/A
665525
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655BHLS8-2.5#PBF
†
N/A
665525
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655CHLS8-2.5#PBF
N/A
554096
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655BHLS8-4.096#PBF
†
†
N/A
554096
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655CHLS8-4.096#PBF
†
N/A
66555
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655BHLS8-5#PBF
†
N/A
66555
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655CHLS8-5#PBF
LTC6655LNBHLS8-2.5#PBF
N/A
55LN25
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655LNCHLS8-2.5#PBF
N/A
55LN25
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655LNBHLS8-4.096#PBF N/A
LN4096
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655LNCHLS8-4.096#PBF N/A
LN4096
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655LNBHLS8-5#PBF
N/A
655LN5
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
LTC6655LNCHLS8-5#PBF
N/A
655LN5
8-Lead Ceramic LCC (5mm
×
5mm) –40°C to 125°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
†This product is only offered in trays.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev. J
For more information
www.analog.com
3
LTC6655/LTC6655LN
AVAILABLE OPTIONS
OUTPUT VOLTAGE
1.250
2.048
2.500
INITIAL ACCURACY
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
3.000
3.300
4.096
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
5.000
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
0.025%
0.05%
†
See Order Information section for complete part number listing.
TEMPERATURE COEFFICIENT
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
2ppm/°C
5ppm/°C
PART NUMBER
†
LTC6655BHMS8-1.25
LTC6655CHMS8-1.25
LTC6655BHMS8-2.048
LTC6655CHMS8-2.048
LTC6655BHMS8-2.5
LTC6655CHMS8-2.5
LTC6655BHLS8-2.5
LTC6655CHLS8-2.5
LTC6655LNBHMS8-2.5
LTC6655LNCHMS8-2.5
LTC6655LNBHLS8-2.5
LTC6655LNCHLS8-2.5
LTC6655BHMS8-3.0
LTC6655CHMS8-3.0
LTC6655BHMS8-3.3
LTC6655CHMS8-3.3
LTC6655BHMS8-4.096
LTC6655CHMS8-4.096
LTC6655BHLS8-4.096
LTC6655CHLS8-4.096
LTC6655LNBHMS8-4.096
LTC6655LNCHMS8-4.096
LTC6655LNBHLS8-4.096
LTC6655LNCHLS8-4.096
LTC6655BHMS8-5
LTC6655CHMS8-5
LTC6655BHLS8-5
LTC6655CHLS8-5
LTC6655LNBHMS8-5
LTC6655LNCHMS8-5
LTC6655LNBHLS8-5
LTC6655LNCHLS8-5
Rev. J
4
For more information
www.analog.com
LTC6655/LTC6655LN
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
+ 0.5V, V
OUT_S
connected to V
OUT_F
, unless otherwise noted.
PARAMETER
Output Voltage
Output Voltage Temperature Coefficient
(Note 4)
Line Regulation
Load Regulation (Note 5)
CONDITIONS
LTC6655B
LTC6655C
LTC6655B
LTC6655C
V
OUT
+ 0.5V ≤ V
IN
≤ 13.2V,
SHDN
= 2V
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
–0.025
–0.05
TYP
MAX
0.025
0.05
UNITS
%
%
ppm/°C
ppm/°C
ppm/V
ppm/V
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
V
V
V
mA
mA
1
2.5
5
3
2
5
25
40
15
15
20
85
30
45
35
125
13.2
13.2
13.2
I
SOURCE
= 5mA
LTC6655MS8
l
LTC6655LS8
l
3
6
l
LTC6655LNMS8
LTC6655LNLS8
l
50
10
l
I
SINK
= 5mA
LTC6655MS8
LTC6655LS8
l
20
14
l
LTC6655LNMS8
LTC6655LNLS8
l
70
Operating Voltage (Note 6)
LTC6655-1.25, LTC6655-2.048, LTC6655-2.5
I
SOURCE
= 5mA, V
OUT
Error ≤ 0.1%
LTC6655-3, LTC6655-3.3, LTC6655-4.096, LTC6655-5
I
SOURCE
= ±5mA, V
OUT
Error ≤ 0.1%
I
OUT
= 0mA, V
OUT
Error ≤ 0.1%
l
3
l
V
OUT
+ 0.5
l
V
OUT
+ 0.2
Output Short-Circuit Current
Shutdown Pin (SHDN)
Short V
OUT
to GND
Short V
OUT
to V
IN
Logic High Input Voltage
Logic High Input Current,
SHDN
= 2V
Logic Low Input Voltage
Logic Low Input Current,
SHDN
= 0.8V
l
l
l
l
20
20
2.0
12
0.8
15
5
l
l
V
µA
V
µA
mA
mA
µA
Supply Current
Shutdown Current
No Load
SHDN
Tied to GND
7
7.5
20
Rev. J
For more information
www.analog.com
5
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