LTC1093 Linear Technology Corporation, LTC1093 Datasheet

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LTC1093

Manufacturer Part Number
LTC1093
Description
1, 2, 6 and 8 Channel, 10-Bit Serial I/O Data Acquisition Systems
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
TYPICAL
DESCRIPTIO
The LTC
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-
Programmable Features
– Unipolar/Bipolar Conversions
– Differential/Single-Ended Multiplexer
Sample-and-Holds
Single Supply 5V, 10V or 5V Operation
Direct 3- or 4-Wire Interface to Most MPU Serial
Ports and All MPU Parallel I/O Ports
Analog Inputs Common Mode to Supply Rails
Resolution: 10 Bits
Total Unadjusted Error (A Grade): 1LSB Over Temp
Fast Conversion Time: 20 s
Low Supply Current
ANALOG INPUT #1
ANALOG INPUT #2
0V TO 5V RANGE
0V TO 5V RANGE
Configurations
LTC1091: 3.5mA Max, 1.5mA Typ
LTC1092/LTC1093/LTC1094: 2.5mA Max, 1mA Typ
®
1091/LTC1092/LTC1093/LTC1094 10-bit data
APPLICATION
1
2
3
4
CS
CH0
CH1
GND
U
LTC1091
(V
D
REF
CLK
V
OUT
D
CC
IN
)
8
7
6
5
5V
U
SERIAL DATA LINK
4.7 F
APPLICATIONS INFORMATION
Serial I/O Data Acquisition Systems
FOR 8051 CODE SEE
P1.4
P1.3
P1.2
SECTION
(e.g., 8051)
MPU
1-, 2-, 6- and 8-Channel, 10-Bit
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
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
less critical.
0.5LSB maximum over temperature. In addition, the A
2LSB for applications where full scale is adjustable or
, LTC and LT are registered trademarks of Linear Technology Corporation.
1091 TA01
1.25
1.00
0.75
0.50
0.25
0
0
LTC1093/LTC1094
LTC1091/LTC1092
V
CC
= 5V
1
REFERENCE VOLTAGE (V)
2
3
4
1091 TA02
5
1

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LTC1093 Summary of contents

Page 1

... Analog Inputs Common Mode to Supply Rails Resolution: 10 Bits Total Unadjusted Error (A Grade): 1LSB Over Temp Fast Conversion Time Low Supply Current LTC1091: 3.5mA Max, 1.5mA Typ LTC1092/LTC1093/LTC1094: 2.5mA Max, 1mA Typ U DESCRIPTIO ® The LTC 1091/LTC1092/LTC1093/LTC1094 10-bit data acquisition systems are designed to provide complete ...

Page 2

... Lead Temperature (Soldering, 10 sec.)................ 300 0.3V ORDER PART NUMBER CS 1 +IN 2 LTC1091ACN8 LTC1091CN8 –IN 3 GND 4 T JMAX LTC1093ACN CH0 1 LTC1093CN CH1 2 LTC1093CSW CH2 3 CH3 4 CH4 5 CH5 6 CH6 7 CH7 8 COM 9 DGND 10 T JMAX REDUCED SPAN CAPABILITY BIPOLAR (SEPARATE V ) REF ORDER PART TOP VIEW ...

Page 3

... Analog and REF Input Range (Note 7) On-Channel Leakage Current On-Channel = 5V (Note 8) Off-Channel = 0V On-Channel = 0V Off-Channel = 5V Off-Channel Leakage Current On-Channel = 5V (Note 8) Off-Channel = 0V On-Channel = 0V Off-Channel = LTC1091A/LTC1092A/LTC1093A/LTC1094A LTC1091/LTC1092/LTC1093/LTC1094 CONDITIONS MIN 4.5 LTC1093/LTC1094 – 5 0.01 CC LTC1091 15 CLK Cycles + 2 s LTC1092 12 CLK Cycles + 2 s LTC1093/LTC1094 18 CLK Cycles + 150 CC V ...

Page 4

... Note 2: All voltage values are with respect to ground with DGND, AGND, – GND and REF wired together (unless otherwise noted). REF connected to the AGND pin on the LTC1093. DGND, AGND, REF are internally connected to the GND pin on the LTC1091/LTC1092. + – – ...

Page 5

... SUPPLY VOLTAGE (V) 1091/2/3/4 G08 **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. LTC1091/LTC1092 LTC1093/LTC1094 Change in Full-Scale Error vs Temperature 0 REF f = 500kHz CLK 0.5 0.4 ...

Page 6

... LTC1091 Supply Current vs Supply Voltage 500kHz CLK REF SUPPLY VOLTAGE (V) †† MAXIMUM R FILTER CHANGE IN FULL-SCALE ERROR FROM ITS VALUE AT R LTC1091/LTC1092/LTC1093/LTC1094 Sample-and-Hold Acquisition Time vs Source Resistance INPUT STEP 1 R SOURCE V IN 0.1 100 1k 10000 + ( ) R SOURCE LTC1091 Linearity Error vs Supply Voltage 1. 500kHz CLK ...

Page 7

... SUPPLY VOLTAGE (V) LTC1092/LTC1093/LTC1094 Supply Current vs Supply Voltage 6 V OPEN REF f = 500kHz CLK SUPPLY VOLTAGE (V) LTC1091/LTC1092 LTC1093/LTC1094 LTC1092/LTC1093/LTC1094 Change in Full-Scale Error vs Reference Voltage 1. 1.00 0.75 0.50 0. REFERENCE VOLTAGE (V) 1092/2/3/4 G20 LTC1092/LTC1093/LTC1094 Linearity Error vs Supply Voltage 1. REF f = 500kHz CLK 1.00 0.75 0.50 0.25 ...

Page 8

... Tie to the ground plane. – V (Pin 9/Pin 11): Negative Supply. Tie V negative potential in the circuit. (Ground in single supply applications.) AGND (Pin 10/Pin 12): Analog Ground. AGND should be tied directly to the analog ground plane. LTC1093/LTC1094 Input Channel Leakage Current vs Temperature 1000 900 GUARANTEED 800 700 600 ...

Page 9

... CTIO S V (Pin 11)(LTC1093): Reference Input. The reference REF input must be kept free of noise with respect to AGND. + – REF , REF (Pins 13, 14 )(LTC1094): Reference Input. The reference input must be kept free of noise with respect to AGND. D (Pin 12/Pin 15): Data Input. The A/D configuration IN word is shifted into this input ...

Page 10

... LTC1091/LTC1092 LTC1093/LTC1094 TEST CIRCUITS On- and Off-Channel Leakage Current OFF A POLARITY Voltage Waveforms for D Delay Time, t OUT CLK 0.8V t dDO D OUT Load Circuit for t dis TEST POINT 3k D OUT 100pF LTC1091 CLK D OUT 10 ON-CHANNEL OFF- CHANNELS 1091/2/3/4 TC01 Voltage Waveforms for D dDO ...

Page 11

... 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 D input which configures the LTC1091/LTC1093/LTC1094 and starts the conversion. After one null bit, the result of the conversion is output on the D data exchange, CS should be brought high ...

Page 12

... The following disussion applies to the con figuration of the LTC1091/LTC1093/LTC1094 OUT The LTC1091/LTC1093/LTC1094 clock data into the D input on the rising edge of the clock. The input data words are defined as follows: 1091/2/3/4 AI01 LTC1091 DATA INPUT (D START line. Bringing CS OUT LTC1093/LTC1094 DATA INPUT (D ...

Page 13

... CS CLK SEL1 START UNI D IN MSBF SGL/ ODD/ SEL0 Hi-Z Hi-Z DIFF SIGN D OUT t SMPL W U LTC1092 Operating Sequence t CYC LTC1093/LTC1094 Operating Sequence + – , CH5 ), Unipolar Mode t CYC DON’T CARE CONV t CYC DON’T CARE CONV LTC1091/LTC1092 LTC1093/LTC1094 B9 t SMPL ...

Page 14

... The first “logical one” clocked into the D goes low is the start bit. The start bit initiates the data transfer. The LTC1091/LTC1093/LTC1094 will ignore all leading zeros which precede this logical one. After the start bit is received, the remaining bits of the input word will be clocked in ...

Page 15

... The LTC1091/LTC1092 are permanently configured for unipolar mode Bipolar Transfer Curve (UNI = 0) LTC1093/LTC1094 Only –V + 1LSB REF –V REF W U Unipolar Output Code (UNI = 1) OUTPUT CODE Bipolar Output Code (UNI = 0) LTC1093/LTC1094 Only OUTPUT CODE Unipolar Transfer Curve (UNI = 1) V – 2LSB 0V 1LSB REF V REF ...

Page 16

... W U eliminates one 8-bit transfer and positions data right justified inside the MPU. 4. Operation with D The LTC1091/LTC1093/LTC1094 can be operated with D and D IN required to communicate to the MPU. Data is transmitted in both directions on a single wire. The processor pin connected to this data line should be configurable as either an input or an output ...

Page 17

... Table 1 MPU without a dedicated serial port is used, then three or four of the MPU’s parallel port lines can be programmed to form the serial link to the LTC1091/ LTC1092/LTC1093/LTC1094. Included here are one serial interface example and one example showing a parallel port programmed to form the serial interface. ...

Page 18

... LTC1091/LTC1092 LTC1093/LTC1094 PPLICATI S I FOR ATIO Motorola SPI (MC68HC05C4, MC68HC11) The MC68HC05C4 has been chosen as an example of an MPU with a dedicated serial port. This MPU transfers data MSB first and in 8-bit increments. With two 8-bit transfers, the A/D result is read into the MPU. The first 8-bit transfer ...

Page 19

... MSBF BIT LATCHED INTO LTC1091 MSBF LTC1091 SENDS A/D RESULT LTC1091 TAKES CONTROL OF DATA LINE ON 4TH FALLING CLK LTC1091/LTC1092 LTC1093/LTC1094 COMMENTS A, #FFH D Word for LTC1091 IN P1.4 Make Sure CS Is High P1.4 CS Goes Low R4, #04 Load Counter A Rotate D Bit into Carry IN P1 ...

Page 20

... The AGND pin (GND on the LTC1091/LTC1092) should be tied directly to this ground plane. The DGND pin of the LTC1093/LTC1094 can also be tied directly to this ground plane because minimal digital noise is generated within the chip itself. The V ...

Page 21

... Source Resistance The analog inputs of the LTC1091/LTC1092/LTC1093/ LTC1094 look like a 60pF capacitor (C 500 resistor ( shown in Figure switched between the selected “ ...

Page 22

... LTC1091/LTC1092 LTC1093/LTC1094 PPLICATI S I FOR ATIO “–” Input Settling At the end of the sample phase the input capacitor switches to the “–” input and the conversion starts (see Figure 8). During the conversion, the “+” input voltage is effectively “held” by the sample-and-hold and will not affect the conversion result. However critical that the “ ...

Page 23

... Input Channel Leakage Current vs Temperature). 4. Sample-and-Hold Single-Ended Inputs The LTC1091/LTC1093/LTC1094 provide a built-in sample- and-hold (S&H) function for all signals acquired in the single- ended mode. This sample-and-hold allows conversion of rapidly varying signals (see typical curve of S&H Acquisition Time vs Source Resistance). The input voltage is sampled ...

Page 24

... Reference Inputs The voltage between the reference inputs of the LTC1091/LTC1092/LTC1093/LTC1094 defines the volt- age span of the A/D converter. The reference inputs look primarily like a 10k resistor but will have transient capaci- tive switching currents due to the switched capacitor conversion technique (see Figure 12) ...

Page 25

... U 5V reference becomes 0.5LSB with a 1V reference and 2.5LSBs with a 0.2V reference. If this offset is unaccept- able, it can be corrected digitally by the receiving system or by offsetting the “–” input to the LTC1092/LTC1093/ LTC1094. Noise with Reduced V The total input-referred noise of the LTC1092/LTC1093/ ...

Page 26

... LTC1091/LTC1092 LTC1093/LTC1094 O U TYPICAL A PPLICATI 500 C Furnace Exhaust Gas Temperature Monitor with Low Supply Detection – LT1025A J TYPE GND COMMON 0 0. 0.1 F 20k LTC1052 8 2 – 10k 0.1 F 0.33 F 3.4k 178k 1% 0. OUT LT1021-5 + 56k 1N4148 LTC1091A MCU CH0 CLK CH1 ...

Page 27

... DGND V 4562 1491 *YSI 44007, 44034 OR EQUIVALENT – 125 C Thermometer Using Current Output Silicon Sensors 9V 4 LT1019-2.5 LM134 OR OTHER SENSOR LTC1092 SCLK – D OUT 11.5k GND V REF LTC1091/LTC1092 LTC1093/LTC1094 5V 4 MCU + LT1006 – 1091-4 TA04 OUT 3 TO MCU 1091 TA05 27 ...

Page 28

... LTC1091/LTC1092 LTC1093/LTC1094 PACKAGE DESCRIPTIO 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 +0.889 8.255 –0.381 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm Dimensions in inches (millimeters) unless otherwise noted. ...

Page 29

... PDIP (Narrow 0.300) (LTC DWG # 05-08-1510 0.255 0.015* (6.477 0.381 0.130 0.005 (3.302 0.127) (1.143 – 1.651) 0.020 (0.508) MIN 0.125 0.100 (3.175) (2.54) MIN BSC LTC1091/LTC1092 LTC1093/LTC1094 0.770* (19.558) MAX 0.045 – 0.065 0.065 (1.651) TYP 0.018 0.003 (0.457 0.076) N16 1098 29 ...

Page 30

... LTC1091/LTC1092 LTC1093/LTC1094 PACKAGE DESCRIPTIO 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 +0.889 8.255 –0.381 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm Dimensions in inches (millimeters) unless otherwise noted. ...

Page 31

... Plastic Small Outline (Wide 0.300) (LTC DWG # 05-08-1620 NOTE 1 1 0.093 – 0.104 45 (2.362 – 2.642) 0 – 8 TYP 0.050 (1.270) BSC 0.014 – 0.019 (0.356 – 0.482) LTC1091/LTC1092 LTC1093/LTC1094 0.398 – 0.413* (10.109 – 10.490 0.394 – 0.419 (10.007 – 10.643 0.037 – ...

Page 32

... TO ADDITIONAL LTC1094s 300 4N28 10k 2N3904 ISOLATION 4N28 BARRIER NC COMMENTS Serial I/O, 1.5mA Supply Current Pin Compatible Upgrades to LTC1091/LTC1092 Pin Compatible Upgrades to LTC1093/LTC1094 5V 10k 2N3906 C1 150 5V 10k SCK 150 5V 10k C0 150 TO 68HC05** 5V 10k MOSI 150 5 ...

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