1391 high performance CMOS 8-to-1 analog multiplexer. features serial

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1391 high performance CMOS 8-to-1 analog multiplexer. features serial

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LTC1391 8-Channel Analog Multiplexer with Cascadable Serial Interface
1391 high performance CMOS 8-to-1 analog multiplexer. features serial digital interface that allows several LTC1391s daisy-chained together, increasing number channels available using single digital port. LTC1391 features typical typical switch leakage 50pA guaranteed break-beforemake operation. Charge injection ±10pC maximum. digital inputs CMOS compatible when operated from single dual supplies. inputs withstand 100mA fault current. LTC1391 available 16-pin PDIP, SSOP narrow packages. applications requiring 2-way serial data transmission, LTC1390 data sheet.
registered trademarks Linear Technology Corporation.
RON: Single 2.7V Supply Operation Analog Inputs Extend Supply Rails Charge Injection Serial Digital Interface Leakage: ±5nA Guaranteed Break-Before-Make TTL/CMOS Compatible Digital Inputs Cascadable Allow Additional Channels Used Demultiplexer
APPLICATIONS
Data Acquisition Systems Communication Systems Signal Multiplexing/Demultiplexing
TYPICAL APPLICATION
8-Channel 12-Bit
0.1µF OPTIONAL INPUT FILTER
ANALOG INPUTS
LTC1391
ON-RESISTANCE
DOUT DATA DATA
VREF
LTC1285 DOUT CS/SHDN
SERIAL INTERFACE
1391 TA01
On-Resistance Analog Input Voltage
25°C 2.7V
ANALOG INPUT VOLTAGE
1391 TA02
LTC1391
ABSOLUTE MAXIMUM RATINGS
(Note
PACKAGE/ORDER INFORMATION
VIEW DOUT
Total Supply Voltage Input Voltage Analog Inputs 0.3V) 0.3V) Digital Inputs 0.3V Digital Outputs 0.3V 0.3V) Power Dissipation. 500mW Operating Temperature Range LTC1391C 70°C LTC1391I. 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1391CGN LTC1391CN LTC1391CS LTC1391IGN LTC1391IN LTC1391IS PART MARKING 1391 1391I
PACKAGE PACKAGE 16-LEAD PLASTIC SSOP 16-LEAD PDIP PACKAGE 16-LEAD PLASTIC
TJMAX 125°C, 110°C/ (GN) TJMAX 125°C, 70°C/ TJMAX 125°C, 100°C/
Consult factory Military grade parts.
operating temperature range, unless otherwise specified.
SYMBOL PARAMETER Switch VANALOG Analog Signal Range On-Resistance CONDITIONS (Note ±3.5V
ELECTRICAL CHARACTERISTICS
UNITS %/°C
TMIN 25°C TMAX
±0.05
IS(OFF) ID(OFF) ID(ON) Digital VINH VINL IINL, IINH Dynamic fCLK tOFF tOPEN OIRR QINJ
Temperature Input Leakage Output Leakage Channel Leakage
Channel Channel Channel 5.25V 4.75V 4.75V, 10µA 360µA 4.75V, 1.6mA (Note 2.5V, 35pF 2.5V, 35pF
±0.05
±0.05
High Level Input Voltage Level Input Voltage Input Current High Level Output Voltage Level Output Voltage Clock Frequency Enable Turn-On Time Enable Turn-Off Time Break-Before-Make Interval Isolation Charge Injection
4.74 4.50
2VP-P, 100kHz 1000pF, (Note
LTC1391
ELECTRICAL CHARACTERISTICS
operating temperature range, unless otherwise specified.
SYMBOL Dynamic CS(OFF) CD(0FF) Supply PARAMETER Input Capacitance Output Capacitance Positive Supply Current Negative Supply Current Logic Inputs Tied Together, Logic Inputs Tied Together,
CONDITIONS
UNITS
2.7V, operating temperature range, unless otherwise specified.
SYMBOL PARAMETER Switch VANALOG Analog Signal Range On-Resistance CONDITIONS (Note 1.2V
UNITS %/°C
TMIN 25°C TMAX
±0.05
IS(OFF) ID(OFF) ID(ON) Digital VINH VINL IINL, IINH Dynamic fCLK tOFF tOPEN QIRR QINJ CS(OFF) CD(OFF) Supply
Temperature Input Leakage Output Leakage Channel Leakage
2.5V, 0.5V; 0.5V, 2.5V (Note Channel 2.5V, 0.5V; 0.5V, 2.5V (Note Channel 0.5V, 2.5V (Note Channel 3.0V 2.4V 2.7V, 2.7V, 20µA 400µA 2.7V, 20µA 400µA (Note 1.5V, 35pF (Note 1.5V, 35pF (Note (Note 2VP-P, 100kHz 1000pF, (Note
±0.05
±0.05
High Level Input Voltage Level Input Voltage Input Current High Level Output Voltage Level Output Voltage
2.68 2.30 0.01 0.20
Clock Frequency Enable Turn-On Time Enable Turn-Off Time Break-Before-Make Interval Isolation Charge Injection Input Capacitance Output Capacitance Positive Supply Current
Logic Inputs Tied Together, 2.7V
denotes specifications which apply over full operating temperature range. Note Absolute Maximum Ratings those values beyond which life device impaired.
Note Guaranteed Design. Note Leakage current with single 2.7V supply guaranteed correlation with leakage current specifications. Note Timing specifications with single 2.7V supply guaranteed correlation with timing specifications.
LTC1391 TYPICAL PERFORMANCE CHARACTERISTICS
On-Resistance Temperature
2.7V 1.2V
OUTPUT VOLTAGE
OUTPUT VOLTAGE
ON-RESISTANCE
TEMPERATURE (°C)
Driver Output High Voltage Output Current
-0.5 2.7V
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE
-1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 OUTPUT VOLTAGE =25°C
1391
FUNCTIONS
(Pins Analog Multiplexer Inputs. (Pin Digital Ground. Connect system ground. (Pin 10): System Clock (TTL/CMOS Compatible). clock synchronizes channel selection bits serial data transfer from DOUT. (Pin 11): Channel Select Input (TTL/CMOS Compatible). logic high this input enables LTC1391 read channel selection bits allows digital data transfer from DOUT. logic this input puts DOUT into three-state enables selected channel analog signal transmission. (Pin 12): Digital Input (TTL/CMOS Compatible). Input channel selection bits. DOUT (Pin 13): Digital Output (TTL/CMOS Compatible). Output from internal shift register. (Pin 14): Negative Supply. (Pin 15): Analog Multiplexer Output. (Pin 16): Positive Supply.
1391
Driver Output Voltage Output Current
25°C 2.7V
0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15
Driver Output Voltage Temperature
1.8mA
2.7V 400µA
OUTPUT CURRENT (mA)
1391
0.10
TEMPERATURE (°C)
1391
Driver Output High Voltage Temperature
TEMPERATURE (°C)
1391
1.6mA
2.7V 400µA
LTC1391
APPLICATIONS INFORMATION
Multiplexer Operation Figure shows block diagram components within LTC1391 required operation. LTC1391 uses select active channel chip select input, switch selected channel shown Figure When high, input data latched into 4-bit shift register rising clock edge. input data consists "EN" string three bits channel selection. "EN" logic high illustrated first input data sequence, enables selected channel. After clocking last channel selection must pulled before next rising clock edge ensure correct operation. Once pulled low, previously selected channel switched ensure break-before-make interval. After delay tON, selected channel switched allowing signal transmission. selected channel remains until next falling edge After delay tOFF, LTC1391 terminates analog signal transmission allows
CONTROL LOGIC 4-BIT SHIFT REGISTER
ANALOG INPUTS
BLOCK
ANALOG OUTPUT
1391
Figure Simplified Block Diagram Operation
HIGH
ANALOG INPUT
1391
Figure Multiplexer Operation
selection next channel. "EN" logic low, illustrated second data sequence, disables channels there will analog signal transmission. Table shows various combinations channel selection.
Table Logic Table Channel Selection
ACTIVE CHANNEL
Digital Data Transfer Operation block diagram Figure shows components within LTC1391 required serial data transfer. When held high, data into 4-bit shift register then shifted DOUT. Data appears DOUT after fourth rising edge clock shown Figure last four
CONTROL LOGIC 4-BIT SHIFT REGISTER DOUT
1391
Figure Simplified Block Diagram Digital Data Transfer Operation
LTC1391
APPLICATIONS INFORMATION
bits clocked into LTC1391 shift register before taken select channel that turned This allows series devices, with DOUT device connected next device, programmed with single data stream.
DOUT
Figure Digital Data Transfer Operation
Multiplexer Expansion Several LTC1391s daisy-chained expand number multiplexer inputs. additional interface ports required expansion. Figure shows LTC1391s connected their analog outputs form 16-to-1 multiplexer input LTC1400 converter.
0.1µF 0.1µF OPTIONAL INPUT FILTER 0.1µF
ANALOG INPUTS
10µF
DOUT LTC1391
ANALOG INPUTS
DOUT LTC1391
Figure Daisy-Chaining LTC1391s Expansion
1391
ensure that only channel switched time, sets channel selection bits needed DATA shown Figure first data sequence used switch second data sequence used select channel from other vice versa. other words, "ENA" high "ENB" low, channel switched channels switched off. "ENA" "ENB" high, channels switched channel switched Care should taken ensure that only LTC1391 enabled time prevent channels from being enabled simultaneously.
1391
Figure Data Sequence Expansion
10µF
10µF
CONV LTC1400 VREF 0.1µF DOUT
0.1µF
DATA
DATA
1391
LTC1391
TYPICAL APPLICATIONS
Daisy-Chaining Five LTC1391s
0.1µF BYPASS CAPACITORS FROM EACH LTC1391 ANALOG INPUTS ANALOG INPUTS ANALOG INPUTS ANALOG INPUTS ANALOG INPUTS VREF 0.1µF
LTC1391 DOUT
LTC1391 DOUT
LTC1391 DOUT
LTC1391 DOUT
LTC1391 DOUT
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
LTC1286 DOUT
DATA
DATA
1391 TA04
LTC1391
PACKAGE
0.015 0.004 (0.38 0.10) 0.007 0.0098 (0.178 0.249) 0.016 0.050 (0.406 1.270)
DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.300 0.325 (7.620 8.255)
0.130 0.005 (3.302 0.127) 0.015 (0.381)
0.009 0.015 (0.229 0.381)
+0.025 0.325 -0.015 +0.635 8.255 -0.381
0.125 (3.175)
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.010 INCH (0.254mm)
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254)
0.053 0.069 (1.346 1.752)
0.016 0.050 0.406 1.270
0.014 0.019 (0.355 0.483)
*DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
Dimensions inches (millimeters) unless otherwise noted. Package 16-Lead Plastic SSOP (Narrow 0.150)
(LTC 05-08-1641)
0.189 0.196* (4.801 4.978) 0.053 0.068 (1.351 1.727) 0.004 0.0098 (0.102 0.249)
0.009 (0.229)
0.008 0.012 (0.203 0.305)
0.0250 (0.635)
0.229 0.244 (5.817 6.198)
0.150 0.157** (3.810 3.988)
GN16 (SSOP) 1098
Package 16-Lead PDIP (Narrow 0.300)
(LTC 05-08-1510)
0.770* (19.558)
0.045 0.065 (1.143 1.651)
0.065 (1.651) 0.005 (0.127) 0.100 0.010 (2.540 0.254) 0.018 0.003 (0.457 0.076)
0.255 0.015* (6.477 0.381)
0695
Package 16-Lead Plastic Small Outline (Narrow 0.150)
(LTC 05-08-1610)
0.386 0.394* (9.804 10.008) 0.004 0.010 (0.101 0.254) 0.228 0.244 (5.791 6.197) 0.150 0.157** (3.810 3.988)
0.050 (1.270)
0695
LTC1391
TYPICAL APPLICATION
Interfacing LTC1391 with LTC1257 Demultiplex Operation
ANALOG OUTPUTS
LTC1391
COMPATIBLE
RELATED PARTS
PART NUMBER LTC1285 LTC1286 LTC1390 LTC1451 LTC1452 LTC1453 DESCRIPTION 12-Bit 12-Bit Serial-Controlled 8-to-1 Analog Multiplexer 12-Bit 12-Bit 12-Bit COMMENTS Micropower, Auto Shutdown, SO-8 Package, SPI, QSPI MICROWIRECompatible Micropower, Auto Shutdown, SO-8 Package, SPI, QSPI MICROWIRE Compatible RON, Bidirectional Serial Interface, Power, 16-Pin Complete VOUT DAC, SO-8 Package, Daisy-Chainable, Power Multiplying VOUT DAC, SO-8 Package, Rail-to-Rail Output, Power Complete VOUT DAC, SO-8 Package, Daisy-Chainable, Power
MICROWIRE trademark National Semiconductor.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
0.1µF
DOUT DATA
OPTIONAL OUTPUT FILTER 0.1µF
VOUT LTC1257 LOAD VREF DOUT
1391 TA03
1391f, sn1391 LT/GP 0896 PRINTED
LINEAR TECHNOLOGY CORPORATION 1995

1391 high performance CMOS 8-to-1 analog multiplexer. features serial

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