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PDF LTC2460 Data sheet ( Hoja de datos )
| Número de pieza | LTC2460 | |
| Descripción | (LTC2460 / LTC2462) ADCs | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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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
24602f
1
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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
24602f
5
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APPLICATIONS INFORMATION
t1
CS
t2
LTC2460/LTC2462
SDO
SDI = LOW
SCK = HIGH
CONVERT
NAP
24602 F05
Figure 5. Conversion Status Monitoring Mode
can be used during the CONVERT and SLEEP states to
assess the conversion status and during the DATA OUT-
PUT state to read the conversion result, and to trigger a
new conversion.
4) When SCK = HIGH, it is possible to monitor the conver-
sion status by pulling CS low and watching for SDO to
go low. This feature is available only in the idle-high
(CPOL = 1) mode.
Serial Interface Operation Modes
The modes of operation can be summarized as follows:
1) The LTC2460/LTC2462 function with SCK idle high
(commonly known as CPOL = 1) or idle low (commonly
known as CPOL = 0).
2) After the 16th bit is read, a new conversion is started
if CS is pulled high or SCK is pulled low.
3) At any time during the Data Output state, pulling CS
high causes the part to leave the I/O state, abort the
output and begin a new conversion.
Serial Clock Idle-High (CPOL = 1) Examples
In Figure 6, following a conversion cycle the LTC2460/
LTC2462 automatically enter the NAP mode with the ADC
powered down. The ADC’s reference will power down if the
SLP bit was set high prior to the just completed conversion
and CS is HIGH. Once CS goes low, the device powers up.
The user can monitor the conversion status at convenient
intervals using CS and SDO.
Pulling CS LOW while SCK is HIGH tests whether
or not the chip is in the CONVERT state. While in
the CONVERT state, SDO is HIGH while CS is LOW.
Once the conversion is complete, SDO is LOW
CS
SD0
SCK
SDI
CONVERT
D15 D14 D13 D12 D2 D1 D0
clk1 clk2 clk3 clk4
clk15 clk16
EN1 EN2 SPD SLP
NAP DATA OUTPUT
Figure 6. Idle-High (CPOL = 1) Serial Clock Operation Example.
The Rising Edge of CS Starts a New Conversion
CONVERT
24602 F06
24602f
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC2460.PDF ] | |
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