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PDF LTC1093C Data sheet ( Hoja de datos )
| Número de pieza | LTC1093C | |
| Descripción | 1-/ 2-/ 6- and 8-Channel/ 10-Bit Serial I/O Data Acquisition Systems | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1091/LTC1092
LTC1093/LTC1094
1-, 2-, 6- and 8-Channel, 10-Bit
Serial I/O Data Acquisition Systems
FEATURES
s Programmable Features
– Unipolar/Bipolar Conversions
– Differential/Single-Ended Multiplexer
Configurations
s Sample-and-Holds
s Single Supply 5V, 10V or ±5V Operation
s Direct 3- or 4-Wire Interface to Most MPU Serial
Ports and All MPU Parallel I/O Ports
s Analog Inputs Common Mode to Supply Rails
s Resolution: 10 Bits
s Total Unadjusted Error (A Grade): ±1LSB Over Temp
s Fast Conversion Time: 20µs
s Low Supply Current
LTC1091: 3.5mA Max, 1.5mA Typ
LTC1092/LTC1093/LTC1094: 2.5mA Max, 1mA Typ
DESCRIPTIO
The LTC®1091/LTC1092/LTC1093/LTC1094 10-bit data
acquisition systems are designed to provide complete
function, excellent accuracy and ease of use when digitiz-
ing analog data from a wide variety of signal sources and
transducers. Built around a 10-bit, switched capacitor,
successive approximation A/D core, these devices include
software configurable analog multiplexers and bipolar and
unipolar conversion modes as well as on-chip sample-
and-holds. On-chip serial ports allow efficient data trans-
fer to a wide range of microprocessors and microcontrol-
lers. These circuits can provide a complete data acquisi-
tion system in ratiometric applications or can be used with
an external reference in others.
The high impedance analog inputs and the ability to
operate with reduced spans (below 1V full scale) allow
direct connection to sensors and transducers in many
applications, eliminating the need for gain stages.
An efficient serial port communicates without external
hardware to most MPU serial ports and all MPU parallel
I/O ports allowing eight channels of data to be transmitted
over as few as three wires. This, coupled with low power
consumption, makes remote location possible and facili-
tates transmitting data through isolation barriers.
Temperature drift of offset, linearity and full-scale error
are all extremely low (1ppm/°C typically) allowing all
grades to be specified with offset and linearity errors of
±0.5LSB maximum over temperature. In addition, the A
grade devices are specified with full-scale error and total
unadjusted error (including the effects of offset, linearity
and full-scale errors) of ±1LSB maximum over tempera-
ture. The lower grade has a full-scale specification of
±2LSB for applications where full scale is adjustable or
less critical.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
5V 4.7µF
ANALOG INPUT #1
0V TO 5V RANGE
ANALOG INPUT #2
0V TO 5V RANGE
1
CS
2
CH0
VCC 8
(VREF)
7
CLK
3 LTC1091 6
CH1 DOUT
4
GND
5
DIN
MPU
(e.g., 8051)
P1.4
P1.3
SERIAL DATA LINK
P1.2
1091 TA01
FOR 8051 CODE SEE
APPLICATIONS INFORMATION
SECTION
1.25
VCC = 5V
1.00
0.75
0.50
0.25
0
01 2 345
REFERENCE VOLTAGE (V)
1091 TA02
1
1 page  
LTC1091/LTC1092
LTC1093/LTC1094
TYPICAL PERFOR A CE CHARACTERISTICS
Change in Offset Error vs
Temperature
0.6
VCC (VREF) = 5V
0.5 fCLK = 500kHz
Change in Linearity Error vs
Temperature
0.6
VCC (VREF) = 5V
0.5 fCLK = 500kHz
Change in Full-Scale Error vs
Temperature
0.6
VCC (VREF) = 5V
0.5 fCLK = 500kHz
0.4 0.4 0.4
0.3 0.3 0.3
0.2 0.2 0.2
0.1 0.1 0.1
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
1091/2/3/4 G01
Digital Input Logic Threshold vs
Supply Voltage
4
TA = 25°C
3
2
1
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
1091/2/3/4 G02
DOUT Delay Time vs Temperature
600
VCC = 5V
500
MSB-FIRST DATA
400
300
LSB-FIRST DATA
200
100
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
1091/2/3/4 G03
DOUT Delay Time vs
Supply Voltage
600
TA = 25°C
500
400
MSB-FIRST DATA
300
200
100 LSB-FIRST DATA
0
456 78
SUPPLY VOLTAGE (V)
Maximum Clock Rate vs
Temperature
3.0
VCC = 5V
2.5
9 10
1091/2/3/4 G04
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
1091/2/3/4 G05
Maximum Clock Rate vs
Supply Voltage
3.0
TA = 25°C
2.5
0
456 78
SUPPLY VOLTAGE (V)
Minimum Clock Rate vs
Temperature
0.3
VCC = 5V
0.25
9 10
1091/2/3/4 G06
2.0 2.0 0.20
1.5 1.5 0.15
1.0 1.0 0.10
0.5 0.5 0.05
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
1091/2/3/4 G07
0
456
78
9 10
SUPPLY VOLTAGE (V)
1091/2/3/4 G08
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
1091/2/3/4 G09
*MAXIMUM CLK FREQUENCY REPRESENTS THE HIGHEST FREQUENCY AT WHICH CLK CAN
BE OPERATED (WITH 50% DUTY CYCLE) WHILE STILL PROVIDING 100ns SETUP TIME FOR
THE DEVICE RECEIVING THE DOUT DATA.
**AS THE CLK FREQUENCY IS DECREASED FROM 500kHz, MINIMUM CLK FREQUENCY
(∆ERROR ≤ 0.1LSB) REPRESENTS THE FREQUENCY AT WHICH A 0.1LSB SHIFT IN ANY
CODE TRANSITION FROM ITS 500kHz VALUE IS FIRST DETECTED.
5
5 Page 
TEST CIRCUITS
LTC1092
CS
Voltage Waveforms for ten
LTC1091/LTC1092
LTC1093/LTC1094
CLK 1
LTC1093/LTC1094
CS
DOUT
0.4V
ten
B9
1091/2/3/4 TC08
DIN START
CLK 1 2 3 4 5 6 7
DOUT
0.4V
ten
B9
1091/2/3/4 TC09
APPLICATI S I FOR ATIO
The LTC1091/LTC1092/LTC1093/LTC1094 are data
acquisiton components that contain the following func-
tional blocks:
1. 10-Bit Successive Approximation A/D Converter
2. Analog Multiplexer (MUX)
3. Sample-and-Hold (S/H)
4. Synchronous, Half-Duplex Serial Interface
5. Control and Timing Logic
DIGITAL CONSIDERATIONS
1. Serial Interface
The LTC1091/LTC1093/LTC1094 communicate with
microprocessors and other external circuitry via a syn-
chronous, half-duplex, 4-wire serial interface while the
LTC1092 uses a 3-wire interface (see Operating Sequence).
The clock (CLK) synchronizes the data transfer with each
bit being transmitted on the falling CLK edge and captured
on the rising CLK edge in both transmitting and receiving
systems. The LTC1091/LTC1093/LTC1094 first receive
input data and then transmit back the A/D conversion
result (half-duplex). Because of the half-duplex operation,
DIN and DOUT may be tied together allowing transmission
over just three wires: CS, CLK and DATA (DIN/DOUT).
Data transfer is initiated by a falling chip select (CS) signal.
After CS falls, the LTC1091/LTC1093/LTC1094 looks for a
start bit. After the start bit is received, a 3-bit input word
(6 bits for the LTC1093/LTC1094) is shifted into the DIN
input which configures the LTC1091/LTC1093/LTC1094
and starts the conversion. After one null bit, the result of
the conversion is output on the DOUT line. At the end of the
data exchange, CS should be brought high. This resets the
LTC1091/LTC1093/LTC1094 in preparation for the next
data exchange.
The LTC1092 does not require a configuration input word
and has no DIN pin. A falling CS initiates data transfer as
shown in the LTC1092 Operating Sequence. After CS falls,
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC1093C.PDF ] | |
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