DESCRIPTIO RON: Single 2.7V Supply Operation Charge Injection Ser
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LTC1391 8-Channel Analog Multiplexer with Cascadable Serial Interface
DESCRIPTIO
RON: Single 2.7V Supply Operation Charge Injection Serial Digital Interface Analog Inputs Extend Supply Rails Leakage: ±5nA Guaranteed Break-Before-Make TTL/CMOS Compatible Digital Inputs Cascadable Allow Additional Channels Used Demultiplexer
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.
APPLICATIO
Data Acquisition Systems Communication Systems Signal Multiplexing/Demultiplexing
TYPICAL APPLICATIO
8-Channel 12-Bit
0.1µF OPTIONAL INPUT FILTER
ANALOG INPUTS
LTC1391
DOUT DATA DATA
VREF
ON-RESISTANCE
LTC1285 DOUT CS/SHDN
SERIAL INTERFACE
1391 TA01
On-Resistance Analog Input Voltage
25°C 2.7V ANALOG INPUT VOLTAGE
1391 TA02
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LTC1391
ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW DOUT
Total Supply Voltage Input Voltage Analog Inputs/Outputs 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 Marketing parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Switch VANALOG Analog Signal Range On-Resistance (Note ±3.5V, CONDITIONS
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. unless otherwise specified.
UNITS %/°C
TMIN (LTC1391C) TMIN -40°C (LTC1391I) 25°C TMAX 70°C (LTC1391C) TMAX 85°C (LTC1391I)
Temperature IS(OFF) ID(OFF) ID(ON) Digital VINH VINL High Level Input Voltage Level Input Voltage High Level Output Voltage Level Output Voltage 5.25V 4.75V 4.75V, 10µA 4.75V, 360µA 4.75V, 1.6mA
Channel Channel Channel ±0.05
Input Leakage Output Leakage Channel Leakage
±0.05
±0.05
4.74 4.50
IINL, IINH Input Current
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LTC1391
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Dynamic fCLK tOFF tOPEN OIRR QINJ CS(OFF) CD(0FF) Supply Positive Supply Current Negative Supply Current Logic Inputs Tied Together, Logic Inputs Tied Together,
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. unless otherwise specified.
CONDITIONS (Note 2.5V, 35pF 2.5V, 35pF 2VP-P, 100kHz 1000pF, (Note UNITS
Clock Frequency Enable Turn-On Time Enable Turn-Off Time Break-Before-Make Interval Isolation Charge Injection Input Capacitance Output Capacitance
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 2.7V, unless otherwise specified.
SYMBOL PARAMETER Switch VANALOG Analog Signal Range On-Resistance (Note 1.2V, TMIN (LTC1391C) TMIN -40°C (LTC1391I) 25°C TMAX 70°C (LTC1391C) TMAX 85°C (LTC1391I) Temperature IS(OFF) ID(OFF) ID(ON) Digital VINH VINL High Level Input Voltage Level Input Voltage High Level Output Voltage Level Output Voltage 3.0V 2.4V 2.7V, 2.7V, 20µA 2.7V, 400µA 2.7V, 20µA 2.7V, 400µA
CONDITIONS
UNITS %/°C
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 ±0.05
Input Leakage Output Leakage Channel Leakage
±0.05
±0.05
2.68 2.30 0.01 0.20
IINL, IINH Input Current
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LTC1391
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Dynamic fCLK tOFF tOPEN QIRR QINJ CS(OFF) CD(OFF) Supply Positive Supply Current Logic Inputs Tied Together, 2.7V
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 2.7V, unless otherwise specified.
CONDITIONS (Note 1.5V, 35pF (Note 1.5V, 35pF (Note (Note 2VP-P, 100kHz 1000pF, (Note UNITS
Clock Frequency Enable Turn-On Time Enable Turn-Off Time Break-Before-Make Interval Isolation Charge Injection Input Capacitance Output Capacitance
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.
TYPICAL PERFOR CHARACTERISTICS
On-Resistance Temperature
2.7V
OUTPUT VOLTAGE
OUTPUT VOLTAGE
ON-RESISTANCE
1.2V
TEMPERATURE (°C)
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
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LTC1391 TYPICAL PERFOR CHARACTERISTICS
Driver Output High Voltage Output Current
-0.5 OUTPUT CURRENT (mA) -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 OUTPUT VOLTAGE =25°C
1391
2.7V OUTPUT VOLTAGE
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. dual supply applications, should exceed +|by more than proper channel selection. (Pin 15): Analog Multiplexer Output. (Pin 16): Positive Supply.
Driver Output High Voltage Temperature
TEMPERATURE (°C)
1391
1.6mA
2.7V 400µA
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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
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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
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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
LTC1286 DOUT
DATA
DATA
1391 TA04
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LTC1391
PACKAGE DESCRIPTIO
Package 16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference 05-08-1641)
0.189 0.196* (4.801 4.978) 0.009 (0.229) 0.229 0.244 (5.817 6.198) 0.150 0.157** (3.810 3.988) 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 0.053 0.068 (1.351 1.727) 0.004 0.0098 (0.102 0.249) 0.008 0.012 (0.203 0.305) 0.0250 (0.635)
GN16 (SSOP) 1098
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LTC1391
PACKAGE DESCRIPTIO
Package 16-Lead PDIP (Narrow .300 Inch)
(Reference 05-08-1510)
0.770* (19.558) 0.255 0.015* (6.477 0.381) 0.130 0.005 (3.302 0.127) 0.020 (0.508) 0.045 0.065 (1.143 1.651) 0.065 (1.651) 0.125 (3.175) 0.018 0.003 (0.457 0.076) 0.100 (2.54)
1098
0.300 0.325 (7.620 8.255)
0.009 0.015 (0.229 0.381)
+0.035 0.325 -0.015 8.255 +0.889 -0.381
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.010 INCH (0.254mm)
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LTC1391
PACKAGE DESCRIPTIO
Package 16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference 05-08-1610)
0.386 0.394* (9.804 10.008) 0.228 0.244 (5.791 6.197) 0.150 0.157** (3.810 3.988) 0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254) 0.053 0.069 (1.346 1.752) 0.004 0.010 (0.101 0.254) 0.014 0.019 (0.355 0.483) 0.050 (1.270)
1098
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
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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.
LTC1391
TYPICAL APPLICATIO
Interfacing LTC1391 with LTC1257 Demultiplex Operation
0.1µF
ANALOG OUTPUTS
LTC1391
COMPATIBLE
RELATED PARTS
PART NUMBER LTC1285 LTC1286 LTC1380/LTC1393 LTC1390 LTC1401 LTC1402 LTC1404 LTC1417 LTC1451 LTC1452 LTC1453 LT1460-2.5 LT1461-2.5 DESCRIPTION 12-Bit 12-Bit SMBus-Controlled Analog Multiplexer Serial-Controlled 8-to-1 Analog Multiplexer 12-Bit, 200ksps Serial 12-Bit, 2.2Msps Serial 12-Bit, 600ksps Serial 14-Bit, 400ksps Serial 12-Bit Voltage Output 12-Bit Voltage Output 12-Bit Voltage Output Micropower, Precision Bandgap Reference Micropower, Dropout Reference COMMENTS Micropower, Auto Shutdown, SO-8 Package, SPI, QSPI MICROWIRECompatible Micropower, Auto Shutdown, SO-8 Package, SPI, QSPI MICROWIRE Compatible Charge Injection RON, Bidirectional Serial Interface, Power, 16-Pin 15mW, Internal Reference, SO-8 Package 90mW with Sleep Modes, ±5V, Internal Reference ±5V, Internal Reference Shutdown 20mW, Single Supply 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 130µA Supply Current, 10ppm/°C, Available SOT-23 50µA Supply Current, 300mV Dropout, 3ppm/°C Drift SO-8 Package, Micropower, Serial Micropower, Multiplying VOUT, Swings from VREF
LTC1655/LTC1655L 16-Bit, Voltage Output DAC, 5V/3V LTC1658 14-Bit, Voltage Output
MICROWIRE trademark National Semiconductor.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507
DOUT DATA
OPTIONAL OUTPUT FILTER 0.1µF
VOUT LTC1257 LOAD VREF DOUT
1391 TA03
sn1391 1391fas LT/TP 0701 1.5K PRINTED
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1995
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