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PDF LTC1294BCS Data sheet ( Hoja de datos )
| Número de pieza | LTC1294BCS | |
| Descripción | Single Chip 12-Bit Data Acquisition System | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1293/LTC1294/LTC1296
Single Chip 12-Bit
Data Acquisition System
FEATURES
s Software Programmable Features
Unipolar/Bipolar Conversion
Differential/Single Ended Inputs
MSB-First or MSB/LSB Data Sequence
Power Shutdown
s Built-In Sample and Hold
s Single Supply 5V or ±5V Operation
s Direct 4-Wire Interface to Most MPU Serial
Ports and All MPU Parallel Ports
s 46.5kHz Maximum Throughput Rate
s System Shutdown Output (LTC1296)
KEY SPECIFICATIO S
s Resolution ..................................................... 12 Bits
s Fast Conversion Time ............ 12µs Max Over Temp.
s Low Supply Current ........................................ 6.0mA
DESCRIPTIO
The LTC1293/4/6 is a family of data acquisition systems
which contain a serial I/O successive approximation A/D
converter. It uses LTCMOSTM switched capacitor technol-
ogy to perform either 12-bit unipolar, or 11-bit plus sign
bipolar A/D conversions. The input multiplexer can be
configured for either single ended or differential inputs (or
combinations thereof). An on-chip sample and hold is
included for all single ended input channels. When the
LTC1293/4/6 is idle it can be powered down in applica-
tions where low power consumption is desired. The
LTC1296 includes a System Shutdown Output pin which
can be used to power down external circuitry, such as
signal conditioning circuitry prior to the input mux.
The serial I/O is designed to communicate without external
hardware to most MPU serial ports and all MPU parallel
I/O ports allowing up to eight channels of data to be
transmitted over as few as three wires.
LTCMOSTM is a trademark of Linear Technology Corporation
TYPICAL APPLICATI
12-Bit Data Acquisition System with Power Shutdown
2N3906
RB
5.1k
350Ω STRAIN
GAUGE BRIDGE
R1
10k
+
1/4 LT1014
–
R2
1.2M
C2
1µF
THREE ADDITIONAL STRAIN GAUGE INPUTS
CAN BE ACCOMMODATED USING THE OTHER
AMPLIFIERS IN THE LT1014
R2
1.2M
CH0 VCC
CH1 SSO
CH2 CLK
CH3 CS
CH4 DOUT
LTC1296
CH5 DIN
CH6 REF+
CH7 REF–
COM
DGND
AGND
V–
74HC04
MPU
47µF
+5V
1N4148
LTC1293 TA01
1
1 page  
LTC1293/LTC1294/LTC1296
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
10
CLK = 1MHz
TA = 25°C
8
6
4
2
0
456
SUPPLY VOLTAGE (V)
LTC1293 G01
Change in Linearity vs Reference
Voltage
1.25
1.00
0.75
0.50
0.25
0
01 2 345
REFERENCE VOLTAGE (V)
LTC1293 G04
Change in Linearity vs
Temperature
0.5
VCC = 5V
VREF = 5V
0.4 CLK = 1MHz
0.3
0.2
0.1
Supply Current vs Temperature
10
CLK = 1MHz
9 VCC = 5V
8
7
6
5
4
3
–50 –30 –10 10 30 50 70 90 110 130
AMBIENT TEMPERATURE (°C)
LTC1293 G02
Change in Gain vs Reference
Voltage
0
VCC = 5V
–0.2
–0.4 LTC1294/6
–0.6
–0.8
–1.0
–1.2
0
LTC1293
1 234
REFERENCE VOLTAGE (V)
5
LTC1293 G05
Change in Gain vs Temperature
0.5
VCC = 5V
VREF = 5V
0.4 CLK = 1MHz
0.3
0.2
0.1
Unadjusted Offset Voltage vs
Reference Voltage
0.9
VCC = 5V
0.8
0.7
0.6
0.5
0.4
VOS = 0.250mV
0.3
0.2
0.1
1
VOS = 0.125mV
23
4
REFERENCE VOLTAGE (V)
5
LTC1293 G03
Change in Offset vs Temperature
0.5
VCC = 5V
VREF = 5V
0.4 CLK = 1MHz
0.3
0.2
0.1
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
LTC1293 G06
Minimum Clock Rate for 0.1LSB
Error
VCC = 5V
0.25
0.20
0.15
0.10
0.05
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
LTC1293 G07
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
LTC1293 G08
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
LTC1293 G09
* AS THE CLK FREQUENCY IS DECREASED FROM 1MHz, MINIMUM CLK FREQUENCY (∆ERROR ≤ 0.1LSB) REPRESENTS
THE FREQUENCY AT WHICH A 0.1LSB SHIFT IN ANY CODE TRANSITION FROM ITS 1MHz VALUE IS FIRST DETECTED.
5
5 Page 
LTC1293/LTC1294/LTC1296
APPLICATI S I FOR ATIO
Table 1a. LTC1294/6 Multiplexer Channel Selection
MUX ADDRESS
SGL/ ODD SELECT
DIFF SIGN 1 0
0 0 00
0 0 01
0 0 10
0 0 11
0 1 00
0 1 01
0 1 10
0 1 11
DIFFERENTIAL CHANNEL SELECTION
01 234 5 6 7
+–
+–
+–
+–
–+
–+
–+
–+
MUX ADDRESS
SGL/ ODD SELECT
DIFF SIGN 1 0
1 0 00
1 0 01
1 0 10
1 0 11
1 1 00
1 1 01
1 1 10
1 1 11
SINGLE-ENDED CHANNEL SELECTION
0 1 2 3 4 5 6 7 COM
+
+
+
+
+
+
+
+
–
–
–
–
–
–
–
–
Table 1b. LTC1293 Channel Selection
MUX ADDRESS
SGL/ ODD SELECT
DIFF SIGN 1 0
0 0 00
0 0 01
0 0 10
0 0 11
0 1 00
0 1 01
0 1 10
0 1 11
DIFFERENTIAL CHANNEL SELECTION
0 12 34 5
+–
+–
+–
Not Used
–+
–+
–+
Not Used
MUX ADDRESS
SGL/ ODD SELECT
DIFF SIGN 1 0
1 0 00
1 0 01
1 0 10
1 0 11
1 1 00
1 1 01
1 1 10
1 1 11
SINGLE-ENDED CHANNEL SELECTION
0 1 2 3 4 5 COM
+–
+–
+–
Not Used
+–
+–
+–
Not Used
Unipolar/Bipolar (UNI)
The UNI bit determines whether the conversion will be
unipolar or bipolar. When UNI is a logical one, a unipolar
conversion will be performed on the selected input volt-
age. When UNI is a logical zero, a bipolar conversion will
result. The input span and code assignment for each
conversion type are shown in the figures below:
Unipolar Transfer Curve (UNI = 1)
Unipolar Output Code (UNI = 1)
OUTPUT CODE
INPUT VOLTAGE
INPUT VOLTAGE (VREF = 5V)
111111111111
111111111110
•
•
•
000000000001
000000000000
VREF – 1LSB
VREF – 2LSB
•
•
•
1LSB
0V
4.9988V
4.9976V
•
•
•
0.0012V
0V
LTC1293 AI03a
111111111111
111111111110
•
•
•
000000000001
000000000000
VIN
LTC1293 AI03b
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC1294BCS.PDF ] | |
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