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PDF LTC1090ACJ Data sheet ( Hoja de datos )
| Número de pieza | LTC1090ACJ | |
| Descripción | Single Chip 10-Bit Data Acquisition System | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1090
Single Chip 10-Bit Data
Acquisition System
FEATURES
■ Software Programmable Features:
Unipolar/Bipolar Conversions
4 Differential/8 Single Ended Inputs
MSB or LSB First Data Sequence
Variable Data Word Length
■ Built-In Sample and Hold
■ Single Supply 5V, 10V or ±5V Operation
■ Direct 4 Wire Interface to Most MPU Serial Ports and
All MPU Parallel Ports
■ 30kHz Maximum Throughput Rate
U
KEY SPECIFICATIO S
■ Resolution: 10 Bits
■ Total Unadjusted Error (LTC1090A): ±1/2LSB Max
■ Conversion Time: 22µs
■ Supply Current: 2.5mA Max, 1.0mA Typ
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corp.
DESCRIPTIO
The LTC®1090 is a data acquisition component which
contains a serial I/O successive approximation A/D con-
verter. It uses LTCMOSTM switched capacitor technology
to perform either 10-bit unipolar, or 9-bit plus sign bipolar
A/D conversions. The 8-channel 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.
The serial I/O is designed to be compatible with industry
standard full duplex serial interfaces. It allows either
MSB or LSB first data and automatically provides 2’s
complement output coding in the bipolar mode. The
output data word can be programmed for a length of 8, 10,
12 or 16 bits. This allows easy interface to shift registers
and a variety of processors.
The LTC1090A is specified with total unadjusted error
(including the effects of offset, linearity and gain errors)
less than ±0.5LSB.
The LTC1090 is specified with offset and linearity less than
±0.5LSB but with a gain error limit of ±2LSB for
applications where gain is adjustable or less critical.
TYPICAL APPLICATIO
LTC1090
DIFFERENTIAL
INPUT
FOR 8051 CODE SEE
APPLICATIONS INFORMATION
SECTION
MPU
(e.g., 8051)
5V
5V
–5V
T
BIPOLAR INPUT
UNIPOLAR
INPUTS
DOUT
DIN
SCLK
P1.1
P1.2
P1.3
CS P1.4
SERIAL DATA
LINK
1.0
0.5
0.0
– 0.5
–1.0
0
Linearity Plot
512
OUTPUT CODE
1024
LTC1090 • TA02
(+)
– UNIPOLAR
(–) INPUT
–5V
LTC1090 • TA01
1090fc
1
1 page  
TEST CIRCUITS
On and Off Channel Leakage Current
5V
ION
A ON CHANNELS
IOFF
A
POLARITY
OFF
CHANNELS
LTC1090 • TC01
LTC1090
Voltage Waveforms for DOUT Delay Time, tdDO
SCLK
DOUT
0.8V
tdDO
2.4V
0.4V
Voltage Waveforms for DOUT Rise and Fall Times, tr, tf
DOUT
2.4V
0.4V
tr tf
LTC1090 • TC02
Voltage Waveforms for ten and tdis
ACLK
12
CS 2.0V
DOUT
WAVEFORM 1
(SEE NOTE 1)
DOUT
WAVEFORM 2
(SEE NOTE 2)
2.4V
ten
0.4V
90%
tdis
10%
NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH THAT THE OUTPUT
IS HIGH UNLESS DISABLED BY THE OUTPUT CONTROL
NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH THAT THE OUTPUT
IS LOW UNLESS DISABLED BY THE OUTPUT CONTROL
LTC1090 • TC03
Load Circuit for tdis and ten
DOUT
TEST
POINT
3k
100pF
5V WAVEFORM 2
WAVEFORM 1
LTC1090 • TC04
Load Circuit for tdDO, tr, and tf
1.4V
DOUT
3k
TEST POINT
100pF
LTC1090 • TC05
1090fc
5
5 Page 
LTC1090
APPLICATIO S I FOR ATIO
CHANNEL
0,1
2,3
4,5
6,7
4 Differential
+( – )
–( + )
+( – )
–( + )
+( – )
–( + )
+( – )
–( + )
LTC1090 • AI04A
8 Single Ended
Combinations of Differential and Single Ended
CHANNEL
0
1
2
3
4
5
6
7
+
+
+
+
+
+
+
+
COM ( – )
CHANNEL
0,1
2,3
4
5
6
7
+
–
–
+
+
+
+
+
COM ( – )
LTC1090 • AI04B
Changing the MUX Assignment “On the Fly”
LTC1090 • AI04C
+
4,5 –
+
6,7 –
COM (UNUSED)
–
5,4 +
6+
7+
COM ( – )
1ST CONVERSION
2ND CONVERSION
LTC1090 • AI04D
LTC1090 • AI04E
Figure 1. Examples of Multiplexer Options on the LTC1090
Unipolar/Bipolar (UNI)
The fifth input bit (UNI) determines whether the conver-
sion will be unipolar or bipolar. When UNI is a logical one,
a unipolar conversion will be performed on the selected
input voltage. When UNI is a logical zero, a bipolar conver-
sion will result. The input span and code assignment for
each conversion type are shown in the figures below.
Unipolar Transfer Curve (UNI = 1)
1111111111
1111111110
0000000001
0000000000
OV 1LSB
VREF – 2LSB VREF
VREF – 1LSB
Bipolar Transfer Curve (UNI = 0)
VIN
LTC1090 • AI05
– VREF +1LSB
– VREF
0111111111
0111111110
0000000001
0000000000
1LSB
– 1LSB
– 2LSB
1111111111
1111111110
1000000001
1000000000
VREF – 2LSB VREF
VREF – 1LSB
VIN
LTC1090 • AI06
1090fc
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC1090ACJ.PDF ] | |
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