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PDF LTC2301 Data sheet ( Hoja de datos )
| Número de pieza | LTC2301 | |
| Descripción | (LTC2301 / LTC2305) 12-Bit ADCs | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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LTC2301/LTC2305
1-/2-Channel, 12-Bit ADCs
with I2C Compatible Interface
FEATURES
DESCRIPTION
n 12-Bit Resolution
n Low Power: 1.5mW at 1ksps, 35μW Sleep Mode
n 14ksps Throughput Rate
n Internal Reference
n Low Noise: SNR = 73.5dB
n Guaranteed No Missing Codes
www.DataShneetS4Uin.cgolme 5V Supply
n 2-wire I2C Compatible Serial Interface with 9
Addresses Plus One Global for Synchronization
n Fast Conversion Time: 1.3μs
n 1-Channel (LTC2301) and 2-Channel (LTC2305)
Versions
n Unipolar or Bipolar Input Ranges (Software
Selectable)
n Internal Conversion Clock
n Guaranteed Operation from –40°C to 125°C
(MSOP Package)
n 12-Pin 4mm × 3mm DFN and 12-Pin MSOP
Packages
APPLICATIONS
n Industrial Process Control
n Motor Control
n Accelerometer Measurements
n Battery Operated Instruments
n Isolated and/or Remote Data Acquisition
n Power Supply Monitoring
The LTC®2301/LTC2305 are low noise, low power, 1-/2-
channel, 12-bit successive approximation ADCs with an I2C
compatible serial interface. These ADCs include an internal
reference and a fully differential sample-and-hold circuit
to reduce common-mode noise. The LTC2301/LTC2305
operate from an internal clock to achieve a fast 1.3μs
conversion time.
The LTC2301/LTC2305 operate from a single 5V supply
and draw just 300μA at a throughput rate of 1ksps. The
ADC enters nap mode when not converting, reducing the
power dissipation.
The LTC2301/LTC2305 are available in small 12-pin
4mm × 3mm DFN and 12-pin MSOP packages. The in-
ternal 2.5V reference further reduces PCB board space
requirements.
The low power consumption and small size make the
LTC2301/LTC2305 ideal for battery operated and portable
applications, while the 2-wire I2C compatible serial interface
makes these ADCs a good match for space-constrained
systems.
12-Bit I2C ADC Famly
Input Channels
1
Part Number
LTC2301
2
LTC2305
8
LTC2309
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
BLOCK DIAGRAM
5V
10μF
0.1μF
CH0(IN+)
ANALOG INPUT
0V TO 4.096V UNIPOLAR CH1(IN+)
±2.048V BIPOLAR
LTC2301
LTC2305
ANALOG
INPUT
MUX
VDD
+
12-BIT
SAR ADC
–
I2C
PORT
INTERNAL
2.5V REF
AD1
AD0
SCL
SDA
VREF
2.2μF
PIN NAMES IN PARENTHESES
REFER TO LTC2301
GND
23015 TA01a
0.1μF
Integral Nonlinearity vs Output Code (LTC2305)
1.00
0.75
0.50
0.25
0.00
–0.25
–0.50
–0.75
REFCOMP
10μF
–1.00
0
1024
2048
3072
4096
OUTPUT CODE
23015 TA01b
23015f
1
1 page  
LTC2301/LTC2305
POWER REQUIREMENTS The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VDD Supply Voltage
IDD Supply Current
Nap Mode
Sleep Mode
14ksps Sample Rate
SLP Bit = 0, Conversion Done
SLP Bit = 1, Conversion Done
l 4.75 5 5.25
l 2.3 3.5
l 225 400
l 7 15
V
mA
μA
μA
PD Power Dissipation
Nap Mode
Sleep Mode
14ksps Sample Rate
SLP Bit = 0, Conversion Done
SLP Bit = 1, Conversion Done
l
11.5 17.5
mW
l
1.125
2
mW
l
35 75
μW
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I2C TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
fSCL
tHD(SDA)
tLOW
tHIGH
SCL Clock Frequency
Hold Time (Repeated) Start Condition
Low Period of the SCL Pin
High Period of the SCL Pin
l
l 0.6
l 1.3
l 0.6
400
tSU(STA)
Set-Up Time for a Repeated Start
Condition
l 0.6
tHD(DAT)
tSU(DAT)
Data Hold Time
Data Set-Up Time
l0
l 100
0.9
tr
Rise Time for SDA/SCL Signals
(Note 11)
l 20 + 0.1CB
300
tf
Fall Time for SDA/SCL Signals
(Note 11)
l 20 + 0.1CB
300
tSU(STO)
tBUF
Set-Up Time for Stop Condition
Bus Free Time Between a Second Start
Condition
l 0.6
l 1.3
UNITS
kHz
μs
μs
μs
μs
μs
ns
ns
ns
μs
μs
ADC TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
fSMPL
tCONV
tACQ
tREFWAKE
Throughput Rate (Successive Reads)
Conversion Time
Acquisition Time
REFCOMP Wakeup Time (Note 12)
(Note 8)
CREFCOMP = 10μF, CREF = 2.2μF
l
l
l
14
1.3 1.6
240
200
ksps
μs
ns
ms
23015f
5
5 Page 
LTC2301/LTC2305
FUNCTIONAL BLOCK DIAGRAM
VDD
www.DataSheet4U.com
LTC2301
LTC2305
AD1
AD0
CH0(IN+)
CH1(IN–)
ANALOG
INPUT
MUX
+
12-BIT
SAR ADC
–
I2C
PORT
SCL
SDA
INTERNAL 8k
2.5V REF
GAIN = 1.6384x
PIN NAMES IN PARENTHESES
REFER TO LTC2301
GND
23015 BD
VREF
REFCOMP
TIMING DIAGRAM
Definition of Timing for Fast/Standard Mode Devices on the I2C Bus
SDA
tf
tLOW
tr
tSU(DAT)
tf
SCL
tHD(SDA)
S
tHD(DAT)
tHIGH
S = START, Sr = REPEATED START, P = STOP
tSU(STA)
Sr
tHD(SDA)
tr
tSP
tBUF
tSU(STO)
P
S 23015 TD
23015f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC2301.PDF ] | |
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