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FEATURES
n 16-Bit Resolution, No Missing Codes
n Internal Reference, High Accuracy 10ppm/°C (Max)
n Single-Ended (LTC2460) or Differential (LTC2462)
n 2LSB Offset Error
n 0.01% Gain Error
n 60 Conversions Per Second
n Single Conversion Settling Time for Multiplexed
Applications
n Single-Cycle Operation with Auto Shutdown
n 1.5mA Supply Current
n 2μA (Max) Sleep Current
n Internal Oscillator—No External Components
Required
n SPI Interface
n Ultra-Tiny 12-Lead 3mm × 3mm DFN and MSOP
Packages
APPLICATIONS
n System Monitoring
n Environmental Monitoring
n Direct Temperature Measurements
n Instrumentation
n Industrial Process Control
n Data Acquisition
n Embedded ADC Upgrades
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6208279, 6411242, 7088280, 7164378.
LTC2460/LTC2462
Ultra-Tiny, 16-Bit ΔΣ ADCs
with 10ppm/°C Max
Precision Reference
DESCRIPTION
The LTC®2460/LTC2462 are ultra tiny, 16-Bit analog-to-
digital converters with an integrated precision reference.
They use a single 2.7V to 5.5V supply and communicate
through an SPI Interface. The LTC2460 is single-ended
with a 0V to VREF input range and the LTC2462 is dif-
ferential with a ±VREF input range. Both ADC’s include
a 1.25V integrated reference with 2ppm/°C drift per-
formance and 0.1% initial accuracy. The converters are
available in a 12-pin DFN 3mm × 3mm package or an
MSOP-12 package. They include an integrated oscillator
and perform conversions with no latency for multiplexed
applications. The LTC2460/LTC2462 include a proprietary
input sampling scheme that reduces the average input
current several orders of magnitude when compared to
conventional delta sigma converters.
Following a single conversion, the LTC2460/LTC2462
automatically power down the converter and can also be
configured to power down the reference. When both the
ADC and reference are powered down, the supply current
is reduced to 200nA.
The LTC2460/LTC2462 can sample at 60 conversions per
second, and due to the very large oversampling ratio,
have extremely relaxed antialiasing requirements. Both
include continuous internal offset and fullscale calibration
algorithms which are transparent to the user, ensuring ac-
curacy over time and the operating temperature range.
TYPICAL APPLICATION
2.7V TO 5.5V
0.1μF
0.1μF
0.1μF
10μF
0.1μF
REFOUT
COMP VCC
10k 10k
IN+ SCK
IN
LTC2462
SDO
CS
SPI
INTERFACE
10k
R
0.1μF
REF
GND
24602 TA01a
VREF vs Temperature
1.2520
1.2515
1.2510
1.2505
1.2500
1.2495
1.2490
1.2485
1.2480
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
24602 TA01b
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ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VCC) ................................... –0.3V to 6V
Analog Input Voltage
(IN+, IN, IN, REF,
COMP, REFOUT) ............................ –0.3V to (VCC + 0.3V)
Digital Voltage
(VSDI, VSDO, VSCK, VCS)................. –0.3V to (VCC + 0.3V)
Storage Temperature Range................... –65°C to 150°C
Operating Temperature Range
LTC2460C/LTC2462C ............................... 0°C to 70°C
LTC2460I/LTC2462I.............................. –40°C to 85°C
PIN CONFIGURATION
LTC2462
LTC2460
TOP VIEW
REFOUT
COMP
CS
SDI
SCK
SDO
1
2
3
4
5
6
12 VCC
11 GND
10 IN
9 IN+
8 REF
7 GND
DD PACKAGE
12-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) PCB GROUND CONNECTION OPTIONAL
TOP VIEW
REFOUT
COMP
CS
SDI
SCK
SDO
1
2
3
4
5
6
12 VCC
11 GND
10 GND
9 IN
8 REF
7 GND
DD PACKAGE
12-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) PCB GROUND CONNECTION OPTIONAL
LTC2462
LTC2460
TOP VIEW
REFOUT 1
COMP 2
CS 3
SDI 4
SCK 5
SDO 6
12 VCC
11 GND
10 IN
9 IN+
8 REF
7 GND
MS PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 120°C/W
TOP VIEW
REFOUT 1
COMP 2
CS 3
SDI 4
SCK 5
SDO 6
12 VCC
11 GND
10 GND
9 IN
8 REF
7 GND
MS PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 120°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2460CDD#PBF
LTC2460CDD#TRPBF LFDQ
12-Lead Plastic (3mm × 3mm) DFN
0°C to 70°C
LTC2460IDD#PBF
LTC2460IDD#TRPBF
LFDQ
12-Lead Plastic (3mm × 3mm) DFN
–40°C to 85°C
LTC2460CMS#PBF
LTC2460CMS#TRPBF 2460
12-Lead Plastic MSOP-12
0°C to 70°C
LTC2460IMS#PBF
LTC2460IMS#TRPBF 2460
12-Lead Plastic MSOP-12
–40°C to 85°C
LTC2462CDD#PBF
LTC2462CDD#TRPBF LDXM
12-Lead Plastic (3mm × 3mm) DFN
0°C to 70°C
LTC2462IDD#PBF
LTC2462IDD#TRPBF
LDXM
12-Lead Plastic (3mm × 3mm) DFN
–40°C to 85°C
LTC2462CMS#PBF
LTC2462CMS#TRPBF 2462
12-Lead Plastic MSOP-12
0°C to 70°C
LTC2462IMS#PBF
LTC2462IMS#TRPBF 2462
12-Lead Plastic MSOP-12
–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/
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LTC2460/LTC2462
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Resolution (No Missing Codes)
(Note 3)
l 16
Bits
Integral Nonlinearity
(Note 4)
l 1 10 LSB
Offset Error
l 2 10 LSB
Offset Error Drift
0.02 LSB/°C
Gain Error
Includes Contributions of ADC and Internal Reference l ±0.01 ±0.25 % of FS
Gain Error Drift
Includes Contributions of ADC and Internal Reference
C-Grade
I-Grade
l
l
±2 ±10 ppm/°C
±5 ppm/°C
Transition Noise
Power Supply Rejection DC
2.2 μVRMS
80 dB
ANALOG INPUTS The l denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at TA = 25°C.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN+
Positive Input Voltage Range
LTC2462
VIN–
Negative Input Voltage Range
LTC2462
l0
l0
VREF
V
VREF
V
VIN
VOR+, VUR+
VOR–, VUR–
CIN
IDC_LEAK(IN+, IN–, IN)
IDC_LEAK(IN–)
Input Voltage Range
Overrange/Underrange Voltage, IN+
Overrange/Underrange Voltage, IN–
IN+, IN, IN Sampling Capacitance
IN+, INDC Leakage Current (LTC2462)
IN DC Leakage Current (LTC2460)
INDC Leakage Current
LTC2460
VIN– = 0.625V (See Figure 3)
VIN+ = 0.625V (See Figure 3)
VIN = GND (Note 8)
VIN = VCC (Note 8)
VIN = GND (Note 8)
VIN = VCC (Note 8)
l0
VREF
8
8
0.35
l –10
l –10
1
1
10
10
l –10
l –10
1
1
10
10
V
LSB
LSB
pF
nA
nA
nA
nA
ICONV
Input Sampling Current (Note 5)
50 nA
VREF Reference Output Voltage
l 1.247 1.25 1.253
V
Reference Voltage Coefficient
(Note 11)
C-Grade
I-Grade
l ±2 ±10 ppm/°C
±5 ppm/°C
Reference Line Regulation
Reference Short Circuit Current
COMP Pin Short Circuit Current
Reference Load Regulation
Reference Output Noise Density
2.7V ≤ VCC ≤ 5.5V
VCC = 5.5, Forcing Output to GND
VCC = 5.5, Forcing Output to GND
2.7V ≤ VCC ≤ 5.5V, IOUT = 100μA Sourcing
CCOMP= 0.1μF, CREFOUT = 0.1μF, At f = 1kHz
l
l
–90 dB
35 mA
200 μA
3.5 mV/mA
30 nV/√Hz
POWER REQUIREMENTS The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Supply Voltage
l 2.7
5.5 V
ICC Supply Current
Conversion
Nap
Sleep
l
1.5 2.5
mA
l
800 1500
μA
l
0.2 2
μA
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DIGITAL INPUTS AND DIGITAL OUTPUTS The l denotes the specifications which apply over the full
operating temperature range,otherwise specifications are at TA = 25°C. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIH High Level Input Voltage
VIL Low Level Input Voltage
IIN Digital Input Current
CIN Digital Input Capacitance
VOH
High Level Output Voltage
IO = –800μA
VOL
Low Level Output Voltage
IO = 1.6mA
IOZ Hi-Z Output Leakage Current
l VCC – 0.3
l
l –10
l VCC – 0.5
l
l –10
10
0.3
10
0.4
10
V
V
μA
pF
V
V
μA
TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature
range,otherwise specifications are at TA = 25°C.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP
MAX UNITS
tCONV
Conversion Time
l 13
16.6
23
ms
fSCK SCK Frequency Range
l 2 MHz
tlSCK SCK Low Period
l 250
ns
thSCK
SCK High Period
t1
CS Falling Edge to SDO Low Z
(Notes 7, 8)
t2
CS Rising Edge to SDO High Z
(Notes 7, 8)
t3 CS Falling Edge to SCK Falling Edge
l 250
l0
l0
l 100
ns
100 ns
100 ns
ns
tKQ
SCK Falling Edge to SDO Valid
(Note 7)
l0
100 ns
t4
SDI Setup Before SCK
(Note 3)
l 100
ns
t5 SDI Hold After SCK
(Note 3)
l 100
ns
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. All voltage values are with respect to GND. VCC = 2.7V to 5.5V
unless otherwise specified.
VREFCM = VREF/2, FS = VREF
VIN = VIN+ – VIN–, –VREF ≤ VIN ≤ VREF; VINCM = (VIN+ + VIN–)/2.
Note 3. Guaranteed by design, not subject to test.
Note 4. Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
Guaranteed by design and test correlation.
Note 5: CS = VCC. A positive current is flowing into the DUT pin.
Note 6: SCK = VCC or GND. SDO is high impedance.
Note 7: See Figure 4.
Note 8: See Figure 5.
Note 9: Input sampling current is the average input current drawn from the
input sampling network while the LTC2460/LTC2462 is actively sampling
the input.
Note 10: A positive current is flowing into the DUT pin.
Note 11: Temperature coefficient is calculated by dividing the maximum
change in output voltage by the specified temperature range.
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LTC2460/LTC2462
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted)
Integral Nonlinearity
3
VCC = 5.5V
TA = –45°C, 25°C, 90°C
2
1
0
–1
–2
–3
–1.25
–0.75 –0.25 0.25 0.75 1.25
DIFFERENTIAL INPUT VOLTAGE (V)
24602 G01
Integral Nonlinearity
3
VCC = 2.7V
TA = –45°C, 25°C, 90°C
2
1
0
–1
–2
–3
–1.25
–0.75 –0.25 0.25 0.75 1.25
DIFFERENTIAL INPUT VOLTAGE (V)
24602 G02
Maximum INL vs Temperature
3 VCC = 5.5V, 4.1V, 2.7V
2
1
0
–1
–2
–3
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
24602 G03
Offset Error vs Temperature
5
4
VCC = 5.5V
3
2 VCC = 4.1V
1
0 VCC = 2.7V
–1
–2
–3
–4
–5
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
24602 G04
Conversion Mode Power Supply
Current vs Temperature
2.0
1.9
1.8
VCC = 5.5V
1.7 VCC = 4.1V
1.6
1.5
1.4
VCC = 2.7V
1.3
1.2
1.1
1.0
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
24602 G07
ADC Gain Error vs Temperature
25
VCC = 5.5V
20
15
10 VCC = 4.1V
5
VCC = 2.7V
0
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
24602 G05
Transition Noise vs Temperature
10
9
8
7
6
5
4
VCC = 2.7V
3
2
VCC = 5.5V
1
0
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
24602 G06
Sleep Mode Power Supply
Current vs Temperature
350
300
250 VCC = 5.5V
200
150
VCC = 4.1V
100
50 VCC = 2.7V
0
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
24602 G08
VREF vs Temperature
1.2508
1.2507
1.2506
1.2505
1.2504
1.2503
1.2502
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
24602 G09
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