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PDF LTC2453 Data sheet ( Hoja de datos )
| Número de pieza | LTC2453 | |
| Descripción | 16-Bit ADC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC2453 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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FEATURES
■ ±VCC Differential Input Range
■ 16-Bit Resolution (Including Sign), No Missing Codes
■ 2LSB Offset Error
■ 4LSB Full-Scale Error
■ 60 Conversions Per Second
■ Single Conversion Settling Time for Multiplexed
Applications
■ Single-Cycle Operation with Auto Shutdown
■ 800μA Supply Current
■ 0.2μA Sleep Current
■ Internal Oscillator—No External Components Required
■ 2-Wire I2C Interface
■ Ultra-Tiny 8-Pin 3mm × 2mm DFN
and TSOT23 Packages
APPLICATIONS
■ System Monitoring
■ Environmental Monitoring
■ Direct Temperature Measurements
■ Instrumentation
■ Industrial Process Control
■ Data Acquisition
■ Embedded ADC Upgrades
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. No Latency ΔΣ is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 6208279, 6411242, 7088280, 7164378.
www.DataSheet4U.com
LTC2453
Ultra-Tiny, Differential,
16-Bit ΔΣ ADC With
I2C Interface
DESCRIPTION
The LTC®2453 is an ultra-tiny, fully differential, 16-bit,
analog-to-digital converter. The LTC2453 uses a single
2.7V to 5.5V supply and communicates through an I2C
interface. The ADC is available in an 8-pin, 3mm × 2mm DFN
package or 8-pin, 3mm × 3mm TSOT package. It includes
an integrated oscillator that does not require any external
components. It uses a delta-sigma modulator as a converter
core and has no latency for multiplexed applications. The
LTC2453 includes a proprietary input sampling scheme
that reduces the average input sampling current several
orders of magnitude lower than conventional delta-sigma
converters. Additionally, due to its architecture, there is
negligible current leakage between the input pins.
The LTC2453 can sample at 60 conversions per second,
and due to the very large oversampling ratio, has ex-tremely
relaxed antialiasing requirements. The LTC2453 includes
continuous internal offset and full-scale calibration algo-
rithms which are transparent to the user, ensuring accuracy
over time and over the operating temperature range. The
converter has external REF+ and REF– pins and the differential
input voltage range can extend up to ±(VREF+ – VREF–).
Following a single conversion, the LTC2453 can auto-matically
enter a sleep mode and reduce its power to less than 0.2μA. If
the user reads the ADC once a second, the LTC2453 consumes
an average of less than 50μW from a 2.7V supply.
TYPICAL APPLICATION
2.7V TO 5.5V
0.1μF
10μF
0.1μF
REF+ VCC
IN+
SCL
10k 10k
IN–
LTC2453
2-WIRE I2C
SDA INTERFACE
10k R 0.1μF REF– GND
2453 TA01
Integral Nonlinearity, VCC = 3V
2.0
1.5
VVVCRRCEEFF=+–
3V
= 3V
= 0V
1.0
0.5 TA = –45°C, 25°C, 90°C
0
–0.5
–1.0
–1.5
–2.0
–3
–2 –1 0 1 2
DIFFERENTIAL INPUT VOLTAGE (V)
3
2453 TA01b
2453fb
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LTC2453
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted)
Offset Error vs Temperature
5
4
3
VCC = VREF+ = 3V
2 VCC = VREF+ = 4.1V
1
VCC = VREF+ = 5V
0
–1
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
2453 G04
Transition Noise vs Output Code
3.0
2.5
2.0 VCC = VREF+ = 3V
1.5
VCC = VREF+ = 5V
1.0
0.5
0
–32768
–16384
0
16384
OUTPUT CODE
32768
2453 G07
Average Power Dissipation
vs Temperature, VCC = 3V
10000
1000
100
25Hz OUTPUT SAMPLE RATE
10Hz OUTPUT SAMPLE RATE
1Hz OUTPUT SAMPLE RATE
10
Gain Error vs Temperature
5
4
3 VCC = VREF+ = 3V
VCC = VREF+ = 4.1V
2
1
VCC = VREF+ = 5V
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
2453 G05
Conversion Mode Power Supply
Current vs Temperature
1200
60Hz OUTPUT SAMPLE RATE
1000
800
VCC = 5V
600 VCC = 3V VCC = 4.1V
400
200
0
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
2453 G08
Power Supply Rejection
vs Frequency at VCC
0
–20 VVVVVCRRIINNCEE+–FF=+–==4==12.VV120V.V7V
–40
–60
–80
1
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
2453 G10
–100
1
10 100 1k 10k 100k 1M 10M
FREQUENCY AT VCC (Hz)
2453 G11
Transition Noise vs Temperature
3.0
2.5
2.0
1.5 VCC = 4.1V
1.0 VCC = 5V VCC = 3V
0.5
0
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
2453 G06
Sleep Mode Power Supply
Current vs Temperature
250
200
VCC = 5V
150
100 VCC = 4.1V
50 VCC = 3V
0
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
2453 G09
Conversion Time vs Temperature
21
20
VCC = 3V
19
VCC = 4.1V
18
VCC = 5V
17
16
15
14
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
2453 G12
2453fb
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LTC2453
APPLICATIONS INFORMATION
Driving VCC and GND
In relation to the VCC and GND pins, the LTC2453 combines
internal high frequency decoupling with damping elements,
which reduce the ADC performance sensitivity to PCB
layout and external components. Nevertheless, the very
high accuracy of this converter is best preserved by careful
low and high frequency power supply decoupling.
A 0.1μF, high quality, ceramic capacitor in parallel with a
10μF ceramic capacitor should be connected between the
VCC and GND pins, as close as possible to the package.
The 0.1μF capacitor should be placed closest to the ADC
package. It is also desirable to avoid any via in the circuit
path, starting from the converter VCC pin, passing through
these two decoupling capacitors, and returning to the
converter GND pin. The area encompassed by this circuit
path, as well as the path length, should be minimized.
Very low impedance ground and power planes, and star
connections at both VCC and GND pins, are preferable.
The VCC pin should have three distinct connections: the
REF+
VCC
ILEAK
ILEAK
RSW
15k
(TYP)
VCC RSW
ILEAK
15k
(TYP)
IN+
ILEAK
VCC RSW
ILEAK
15k
(TYP)
IN–
ILEAK
CEQ
0.35pF
(TYP)
REF–
VCC
ILEAK
ILEAK
RSW
15k
(TYP)
2453 F08
first to the decoupling capacitors described above, the
second to the ground return for the input signal source,
and the third to the ground return for the power supply
voltage source.
Driving REF+ and REF–
A simplified equivalent circuit for REF+ and REF– is shown
in Figure 8. Like all other A/D converters, the LTC2453 is
only as accurate as the reference it is using. Therefore, it
is important to keep the reference line quiet by careful low
and high frequency power supply decoupling.
The LT6660 reference is an ideal match for driving the
LTC2453’s REF+ pin. The LTC6660 is available in a 2mm ×
2mm DFN package with 2.5V, 3V, 3.3V and 5V options.
A 0.1μF, high quality, ceramic capacitor in parallel with
a 10μF ceramic capacitor should be connected between
the REF+/REF– and GND pins, as close as possible to the
package. The 0.1μF capacitor should be placed closest
to the ADC.
Driving VIN+ and VIN–
The input drive requirements can best be analyzed using
the equivalent circuit of Figure 9. The input signal VSIG is
connected to the ADC input pins (IN+ and IN–) through
an equivalent source resistance RS. This resistor includes
both the actual generator source resistance and any
additional optional resistors connected to the input pins.
RS
SIG+ +–
RS
SIG– +–
VCC
ILEAK
IN+
RSW
15k
(TYP)
CIN ILEAK
CPAR
CEQ
0.35pF
(TYP)
VCC
ILEAK
IN–
RSW
15k
(TYP)
CIN ILEAK
CPAR
CEQ
0.35pF
(TYP)
ICONV
ICONV
2453 F09
Figure 8. LTC2453 Analog Input/Reference Equivalent Circuit
Figure 9. LTC2453 Input Drive Equivalent Circuit
2453fb
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11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LTC2453.PDF ] | |
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