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DG408L/409L
Vishay Siliconix
Precision 8-Ch/Dual 4-Ch Low Voltage Analog Multiplexers
FEATURES
D Pin-For-Pin compatibility with DG408/409 D 2.7- to 12-V Single Supply or "3- to "6-V Dual Supply Operation D Lower On-Resistance: rDS(on) - 17 W Typ. D Fast Switching: tON - 38 ns, tOFF - 18 ns D Break-Before-Make Guaranteed D Low Leakage: IS(off) - 0.2 nA Max. D Low Charge Injection: 1 pC D TTL, CMOS, LV Logic (3 V) Compatible D -82 dB Off-Isolation at 1 MHz D 2000-V ESD Protection (HBM)
BENEFITS
D D D D High Accuracy Single and Dual Power Rail Capacity Wide Operating Voltage Range Simple Logic Interface
APPLICATIONS
D D D D D D D Data Acquisition Systems Battery Operated Equipment Portable Test Equipment Sample and Hold Circuits Communication Systems SDSL, DSLAM Audio and Video Signal Routing
DESCRIPTION
The DG408L/409L are low voltage pin -for-pin compatible companion devices to the industry standard DG408/409 with improved performance. Using BiCMOS wafer fabrication technology allows the DG408L/409L to operate on single and dual supplies. Single supply voltage ranges from 3- to 12-V while dual supply operation is recommended with "3 to "6 V. The DG408L is an 8-channel single-ended analog multiplexer designed to connect one of eight inputs to a common output as determined by a 3-bit binary address (A0, A1, A2). The DG409L is a dual 4-channel differential analog multiplexer designed to connect one of four differential inputs to a common dual output as determined by its 2-bit binary address (A0, A1). Break-before-make switching action to protect against momentary crosstalk between adjacent channels. The DG408L/409L provides lower on-resistance, faster switching time, lower leakage, less power consumption and higher off-Isolation than the DG408/409.
FUNCTIONAL BLOCK DIAGRAMS AND PIN CONFIGURATIONS
DG408L
Dual-In- Line, SOIC and TSSOP A0 EN VS1 S2 S3 S4 D A1 A2 GND V+ S5 S6 S7 S8
DG409L
Dual-In- Line, SOIC and TSSOP A0 EN VS1a S2a S3a S4a Da A1 GND V+ S1b S2b S3b S4b Db
1 2 3 4 5 6 7 8 Top View Decoders/Drivers
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8 Top View Decoders/Drivers
16 15 14 13 12 11 10 9
Document Number: 71342 S-03720--Rev. D, 07-Apr-03
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DG408L/409L
Vishay Siliconix
TRUTH TABLES AND ORDERING INFORMATION
TRUTH TABLE
A2
X 0 0 0 0 1 1 1 1
DG408L
EN
0 1 1 1 1 1 1 1 1
TRUTH TABLE
A1
X 0 0 1 1
DG409L
On Switch
None 1 2 3 4
A1
X 0 0 1 1 0 0 1 1
A0
X 0 1 0 1 0 1 0 1
On Switch
None 1 2 3 4 5 6 7 8
A0
X 0 1 0 1
EN
0 1 1 1 1
Logic "0" = Logic "1" = X = Don't Care
VAL v 0.8 V VAH w 2 4 V 2.4
For low and high voltage levels for VAX and VEN consult "Digital Control" parameters for specific V+ operation.
ORDERING INFORMATION
Temp Range
- 40 to 85_C
DG408L
Part Number
DG408LDY DG408LDQ DG408LAK
ORDERING INFORMATION
Temp Range
- 40 to 85_C
DG409L
Part Number
DG409LDY DG409LDQ DG409LAK
Package
16-Pin SOIC 16-Pin TSSOP 16-Pin 16 Pin CerDIP
Package
16-Pin SOIC 16-Pin TSSOP 16-Pin 16 Pin CerDIP
- 55 to 125_C LCC-20* *Block Diagram and Pin Configuration not shown.
DG408LAK/883 DG408LAZ/883
- 55 to 125_C LCC-20* *Block Diagram and Pin Configuration not shown.
DG409LAK/883 DG409LAZ/883
ABSOLUTE MAXIMUM RATINGS
Voltage Referenced to VV+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 V GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Digital Inputsa, VS, VD . . . . . . . . . . . . . . . . . . . . . . (V- ) - 0.3 V to (V+) +0.3 V Current (Any Terminal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA Peak Current, S or D (Pulsed at 1 ms, 10% Duty Cycle Max) . . . . . . . . . . . . . . . . . . . . . . . . 100 mA Storage Temperature: (A Suffix) . . . . . . . . . . . . . . . . . . . . . . . . . - 65 to 150_C (D Suffix) . . . . . . . . . . . . . . . . . . . . . . . . - 65 to 125_C Power Dissipation (Package)b 16-Pin Plastic TSSOPc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 mW 16-Pin Narrow SOICc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 mW 16-Pin CerDIPd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mW LCC-20e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 mW Notes a. Signals on SX, DX, Ax, or EN exceeding V+ or V- will be clamped by internal diodes. Limit forward diode current to maximum current ratings. b. All leads soldered or welded to PC board. c. Derate 7.6 mW/_C above 75_C. d. Derate 12 mW/_C above 75_C. e. Derate 10 mW/_C above 75_C.
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Document Number: 71342 S-03720--Rev. D, 07-Apr-03
DG408L/409L
Vishay Siliconix
SPECIFICATIONS (SINGLE SUPPLY 12 V)
Test Conditions Unless Otherwise Specified Parameter Analog Switch
Analog Signal Rangee Drain-Source On-Resistance rDS(on) Matching Between Channelsg On-Resistance Flatnessi VANALOG rDS(on) DrDS rFLAT(on) IS(off) Switch Off Leakage Current ID(off) Channel On Leakage Current ID(on) VEN = 0 V, VD = 11 V or 1 V VS = 1 V or 11 V VS = VD = 1 V or 11 V VD = 10.8 V, VD = 2 V or 9 V, IS = 10 mA Sequence Each Switch On VD = 10.8 V, VD = 2 V or 9 V, IS = 10 mA Room Room Full Room Full Room Full 3 -1 - 15 -1 - 15 -1 - 15 7 1 15 1 15 1 15 -1 - 10 -1 - 10 -1 - 10 7 1 10 1 10 1 10 nA Full Room Full Room 17 1 0 12 29 38 3 0 12 29 35 3 W V
A Suffix
- 55 to 125_C
D Suffix
- 40 to 85_C
Symbol
V+ = 12 V "10% V- = 0 V V, "10%, V VEN = 0.8 V or 2.4 Vf
Tempb
Typd
Minc Maxc Minc Maxc
Unit
Digital Control
Logic High Input Voltage Logic Low Input Voltage Input Current VINH VINL IIN VAX = VEN = 2.4 V or 0.8 V Full Full Full - 1.5 2.4 0.8 1.5 -1 2.4 0.8 1 V mA
Dynamic Characteristics
Transition Time Break-Before-Make Time Enable Turn-On Time Enable Turn-Off Time Charge Injectione Off Isolatione, h Crosstalke Source Off Capacitancee Drain Off Capacitancee Drain On Capacitancee tTRANS tOPEN tON(EN) tOFF(EN) Q OIRR XTALK CS(off) CD(off) CD(on) f = 100 kHz RL = 1 kW kHz, f = 1 MHz, VS = 0 V, VEN = 0 V f = 1 MHz, VD = 2.4 V, VEN = 0 V f = 1 MHz, VD = 0 V, VEN = 2.4 V (DG409L only) VS1 = 8 V, VS8 = 0 V, (DG408L) VS1b = 8 V, VS4b = 0 V, (DG409L) See Figure 2 VS(all) = VDA = 5 V, See Figure 4 VAX = 0 V, VS1 = 5 V (DG408L) VAX = 0 V, VS1b = 5 V (DG409L) V See Figure 3 CL = 1 nF, VGEN = 0 V, RGEN = 0 W Room Full Room Full Room Full Room Full Room Room Room Room Room Room 30 11 38 18 1 - 70 - 82 7 20 31 pF dB 1 55 60 25 35 5 60 68 1 ns 55 60 25 30 5 pC 60 65
Power Supplies
Power Supply Range Power Supply Current V+ I+ VEN = VA = 0 V or 5 V Room 0.2 3 12 0.7 3 12 0.7 V mA
Document Number: 71342 S-03720--Rev. D, 07-Apr-03
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DG408L/409L
Vishay Siliconix
SPECIFICATIONS (DUAL SUPPLY V+ = 5 V, V = 5 V)
Test Conditions Unless Otherwise Specified Parameter Analog Switch
Analog Signal Rangee Drain-Source On-Resistance VANALOG rDS(on) IS(off) Switch Off Leakage Current a ID(off) Channel On Leakage Current a ID(on) VD = "3.5 V, IS = 10 mA Sequence Each Switch On V+ = 5.5 V, V- = 5.5 V VEN = 0 V, VD = "4.5 V, VS = #4.5 V V+ = 5.5 V, V- = 5.5 V VEN = 2.4 V, VD = "4.5 V, VS = #4.5 V Full Room Full Room Full Room Full Room Full 20 -1 - 15 -1 - 15 -1 - 15 -5 5 40 50 1 15 1 15 1 15 -1 - 10 -1 - 10 -1 - 10 -5 5 40 50 1 10 1 10 1 10 nA V W
A Suffix
- 55 to 125_C
D Suffix
- 40 to 85_C
Symbol
V+ = 5 V V = - 5 V "10% V- = 0 V V, V"10%, V VEN = 0.6 V or 2.4 Vf
Tempb
Typd
Minc Maxc Minc Maxc
Unit
Digital Control
Logic High Input Voltage Logic Low Input Voltage Input Currenta VINH VINL IIN VAX = VEN = 2.4 V or 0.6 V Full Full Full - 1.5 2.4 0.6 1.5 -1 2.4 0.6 1 V mA
Dynamic Characteristics
Transition Timee Break-Before-Make Timee Enable Turn-On Timee tTRANS tOPEN tON(EN) tOFF(EN) CS(off) CD(off) CD(on) VS1 = 3.5 V, VS8 = - 3.5 V, (DG408L) VS1b = 3.5 V, VS4b = - 3.5 V, (DG409L) See Figure 2 VS(all) = VDA = 3.5 V, See Figure 4 VAX = 0 V, VS1 = 3.5 V (DG408L) VAX = 0 V, VS1b = 3 5 V (DG409L) V 3.5 See Figure 3 f = 1 MHz, VS = 0 V, VEN = 0 V f = 1 MHz, VD = 0 V, VEN = 0 V f = 1 MHz, VD = 0 V, VEN = 2.4 V Room Full Room Full Room Full Room Full Room Room Room 30 8 25 20 6 15 29 pF 1 55 68 40 50 60 78 1 ns 55 60 40 45 60 65
Enable Turn-Off Timee Source Off Capacitancee Drain Off Capacitancee Drain On Capacitancee
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Document Number: 71342 S-03720--Rev. D, 07-Apr-03
DG408L/409L
Vishay Siliconix
SPECIFICATIONS (SINGLE SUPPLY 5 V)
Test Conditions Unless Otherwise Specified Parameter Analog Switch
Analog Signal Rangee Drain-Source On-Resistance rDS(on) Matching Between Channelsg On-Resistance Flatnessi VANALOG rDS(on) DrDS rFLAT(on) IS(off) Switch Off Leakage Current a ID(off) Channel On Leakage Currenta ID(on) V+ = 5.5 V, VS = 1 V or 4 V VD = 4 V or 1 V V+ = 5.5 V, VD = VS = 1 V or 4 V Sequence Each Switch On V+ = 4.5 V, VD or VS = 1 V or 3.5 V, ID = 5 mA V+ = 4.5 V, VD = 1 V or 3.5 V, IS = 5 mA Room Room Full Room Full Room Full -1 - 15 -1 - 15 -1 - 15 4 1 15 1 15 1 15 -1 - 10 -1 - 10 -1 - 10 4 1 10 1 10 1 10 nA Full Room Full Room 35 1.5 0 5 49 62 3 0 5 40 62 3 W V
A Suffix
- 55 to 125_C
D Suffix
- 40 to 85_C
Symbol
V+ = 5 V, "10%, V- = 0 V VEN = 0.6 V or 2.4 Vf
Tempb
Typd
Minc Maxc Minc Maxc
Unit
Digital Control
Logic High Input Voltage Logic Low Input Voltage Input Currenta VINH VINL IIN V+ = 5 V VAX = VEN = 2.4 V or 0.6 V Full Full Full - 1.5 2.4 0.6 1.5 -1 2.4 0.6 1 V mA
Dynamic Characteristics
Transition Timee Break-Before-Make Timee Enable Turn-On Timee Enable Turn-Off Timee Charge Injectione Off Isolatione, h Crosstalke Source Off Capacitancee Drain Off Capacitancee Drain On Capacitancee tTRANS tOPEN tON(EN) tOFF(EN) Q OIRR XTALK CS(off) CD(off) CD(on) RL = 1 kW f = 100 kHz kW, f = 1 MHz, VS = 0 V, VEN = 0 V f = 1 MHz, VD = 0 V, VEN = 0 V f = 1 MHz, VD = 0 V, VEN = 2.4 V (DG409L only) VS1 = 3.5 V, VS8 = 0 V, (DG408L) VS1b = 3.5 V, VS4b = 0 V, (DG409L) See Figure 2 VS(all) = VDA = 3.5 V, See Figure 4 VAX = 0 V, VS1 = 3.5 V (DG408L) VAX = 0 V, VS1b = 3 5 V (DG409L) V 3.5 See Figure 3 CL = 1 nF, RGEN = 0 W, VGEN = 0 V Room Full Room Full Room Full Room Full Room Room Room Room Room Room 44 17 43 26 1 - 70 - 80 8 21 32 pF dB 1 60 70 45 60 5 125 138 1 ns 60 65 45 50 5 pC 125 135
Document Number: 71342 S-03720--Rev. D, 07-Apr-03
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DG408L/409L
Vishay Siliconix
SPECIFICATIONS (SINGLE SUPPLY 3 V)
Test Conditions Unless Otherwise Specified Parameter Analog Switch
Analog Signal Rangee Drain-Source On-Resistance VANALOG rDS(on) IS(off) Switch Off Leakage Current a ID(off) Channel On Leakage Currenta ID(on) V+ = 3.3 V, VD = VS = 1 or 2 V Sequence Each Switch On V+ = 3.3 V, VS = 2 or 1 V, VD = 1 or 2 V 33V V V+ = 2.7 V, VD = 0.5 or 2.2 V, IS = 5 mA Full Room Full Room Full Room Full Room Full 60 -1 - 15 -1 - 15 -1 - 15 0 3 80 105 1 15 1 15 1 15 -1 - 10 -1 - 10 -1 - 10 0 3 80 100 1 10 1 10 1 10 nA V W
A Suffix
- 55 to 125_C
D Suffix
- 40 to 85_C
Symbol
V+ = 3 V, "10%, V- = 0 V VEN = 0.4 V or 2.0 Vf
Tempb
Typd
Minc Maxc Minc Maxc
Unit
Digital Control
Logic High Input Voltage Logic Low Input Voltage Input Current a VINH VINL IIN VAX = VEN = 2.4 V or 0.4 V Full Full Full - 1.5 2 0.4 1.5 -1 2 0.4 1 V mA
Dynamic Characteristics
Transition Time Break-Before-Make Time Enable Turn-On Time Enable Turn-Off Time Charge Injectione Off Isolatione, h Crosstalke Source Off Capacitancee Drain Off Capacitancee Drain On Capacitancee tTRANS tOPEN tON(EN) tOFF(EN) Q OIRR XTALK CS(off) CD(off) CD(on) f = 100 kHz RL = 1 kW kHz, f = 1 MHz, VS = 0 V, VEN = 0 V f = 1 MHz, VD = 0 V, VEN = 0 V f = 1 MHz, VD = 0 V, VEN = 2 V (DG409L only) VS1 = 1.5 V, VS8 = 0 V, (DG408L) VS1b = 1.5 V, VS4b = 0 V, (DG409L) See Figure 2 VS(all) = VDA = 1.5 V, See Figure 4 VAX = 0 V, VS1 = 1.5 V (DG408L) VAX = 0 V, VS1b = 1 5 V (DG409L) V 1.5 See Figure 3 CL = 1 nF, RGEN = 0 W, VGEN = 0 V Room Full Room Full Room Full Room Full Room Room Room Room Room Room 75 32 70 55 0.4 - 70 - 79 8 19 33 pF dB 1 95 115 100 115 5 150 175 1 ns 95 105 100 105 5 pC 150 175
Notes a. Leakage parameters are guaranteed by worst case test condition and not subject to production test. b. Room = 25_C, Full = as determined by the operating temperature suffix. c. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet. d. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. e. Guaranteed by design, not subject to production test. f. VIN = input voltage to perform proper function. g. DrDS(on) = rDS(on) Max - rDS(on) Min. h. Worst case isolation occurs on Channel 4 do to proximity to the drain pin. i. rDS(on) flatness is measured as the difference between the minimum and maximum measured values across a defined Analog signal.
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Document Number: 71342 S-03720--Rev. D, 07-Apr-03
DG408L/409L
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
rDS(on) vs. VD and Power Supply
80 rDS9on) - Drain-Source On-Resistnace (W) 70 60 50 40 30 20 10 0 0 2 4 6 8 10 12 V+ = 4.5 V V+ = 12 V V+ = 2.7 V rDS9on) - Drain-Source On-Resistnace (W) 25
rDS(on) vs. VD and Power Supply
20 V+ = 5 V V- = - 5 V 15
10
5
0 -5 -3 -1 1 3 5
VD - Drain Voltage (V)
VD - Drain Voltage (V)
Input Threshold vs. V+ Supply Voltage
1.8 1.6 1.4 1.2 VT (V) 1.0 0.8 0.6 0.4 0.2 0.0 0 2 4 6 8 10 12 14 V+ - Positive Supply Voltage (V) Low Threshold Limit rDS9on) - Drain-Source On-Resistnace (W) Upper Threshold Limit 50
rDS(on) vs. VD and Temperature
85_C 40 125_C
30
25_C - 55_C
20
10
0 0 1 2 3 4 5 6 VD - Drain Voltage (V)
rDS(on) vs. VD and Temperature
35 rDS9on) - Drain-Source On-Resistnace (W) 30 85_C 125_C Switching Speed (nS) 25 20 25_C 15 10 5 0 -6 -4 -2 0 2 4 6 - 55_C 50 40 70 60
Switching Time vs. Positive Supply Voltage
tTRANS 30 20 tOFF 10 0 0 2 4 6 8 10 12 14 tON
VD - Drain Voltage (V) Document Number: 71342 S-03720--Rev. D, 07-Apr-03
V+ - Positive Supply Voltage (V)
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DG408L/409L
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
Leakage Current vs. Analog Voltage
10 40 35 0 Leakage Current (pA) Switching Speed (nS) IS(off) 30 tON 25 20 tOFF 15 10 - 30 5 - 40 -5 -3 -1 1 3 5 VD, VS - Analog Voltage (V) 0 3 4 5 6 " - Dual Power Supply Voltage (V) tTRANS
Switching Time vs. Dual Power Supply Voltage
- 10 ID(off) ID(on) - 20
Charge Injection vs. Analog Voltage
1.0 CL = 1000 pF 0.8 Q - Charge Injection (pC) V+ = 12 V V- = 0 V 0.6 Loss (dB) - 10 10
Insertion Loss, Off Isolation and Crosstalk vs. Frequency (Single Supply)
- 30
V+ = 3 V V- = 0 V RL = 50 W
Insertion Loss - 3 dB = 280 MHz
- 50
Off Isolation
0.4 V+ = 5 V V- = - 5 V 0.2 V+ = 5 V V- = 0 V - 70 Crosstalk
- 90
0.0 -5 0 5 10 VS - Source Voltage (V)
- 110 0.1 1 10 Frequency (MHz) 100 1000
Drain/Source Capacitance vs. Analog Voltage
35 CD, CS - Drain/Source Capacitance (pF) CD, CS - Drain/Source Capacitance (pF) 30 25 20 15 10 CS(off) 5 0 0 2 4 6 8 10 12 CD(off) V+ = 12 V V- = 0 V CD(on) 35
Drain/Source Capacitance vs. Analog Voltage
CD(on) 30 25 20 CD(off) 15 10 CS(off) 5 0 -5 -4 -3 -2 -1 0 1 2 3 4 5 V+ = 5 V V- = - 5 V
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Document Number: 71342 S-03720--Rev. D, 07-Apr-03
DG408L/409L
Vishay Siliconix
SCHEMATIC DIAGRAM (TYPICAL CHANNEL)
V+ GND D A0
V+ VAX Level Shift Decode/ Drive S1 V+ EN Sn V-
FIGURE 1.
TEST CIRCUITS
V+
V+ A2 A1 50 W 3V A0 EN GND V300 W VVS1 V+ Switch Output VO A1 A0 50 W 3V EN GND V300 W V35 pF S1b S1a - S4a, Da V+ S4b Db VS1 VS8 VSB4 VO tTRANS S1 ON S8 ON (DG408L) or S4 ON (DG409L) tTRANS 50% 90% 90% 35 pF S1 S2 - S7 VS1
DG408L
S8 D
VS8 VO Logic Input VAX 3V 50% 0V
tr <20 ns tf <20 ns
DG409L
FIGURE 2. Transition Time
Document Number: 71342 S-03720--Rev. D, 07-Apr-03
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DG408L/409L
Vishay Siliconix
TEST CIRCUITS
V+
V+ S1 EN A0 A1 A2 GND 50 W VV+ Switch Output V+ S1b EN A0 A1 GND 50 W VS1a - S4a, Da S2b - S4b VS1 VO 90% VO VS2 - S8 VS1
DG408L
D 300 W VO 35 pF Logic Input 3V 50% 0V tON(EN) 0V tOFF(EN) 10% tr <20 ns tf <20 ns
DG409L
Db V300 W VO 35 pF
FIGURE 3. Enable Switching Time
bbm.5 3V EN V+ All S and Da A0 A1 A2 GND 50 W 4/9 VS1 Logic Input 3V 50% 0V
tr <20 ns tf <20 ns
DG408L DG409L
Db, D V300 W Switch Output 35 pF VO 0V tOPEN VO VS 80%
V-
FIGURE 4. Break-Before-Make Interval
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Document Number: 71342 S-03720--Rev. D, 07-Apr-03
DG408L/409L
Vishay Siliconix
TEST CIRCUITS
V+
Rg SX EN Vg Channel Select A0 A1 A2 GND
V+ Logic Input D VO CL 1 nF VSwitch Output
3V OFF 0V ON OFF
DVO DVO is the measured voltage due to charge transfer error Q, when the channel turns off. Q = CL x DVO
V-
FIGURE 5. Charge Injection
V+ V+ VIN SX Rg = 50 W S8 A0 A1 A2 GND EN VRL 1 kW D VO Rg = 50 W V+ VS V+
VIN VS
S1 SX S8 A0 A1 A2 GND
D RL 1 kW
VO
EN
V-
VOff Isolation = 20 log VOUT VIN
VCrosstalk = 20 log VOUT VIN
FIGURE 6. Off Isolation
FIGURE 7. Crosstalk
V+
V+
VS Rg = 50 W
S1
V+ A2
V+
S1 Meter S8 HP4192A Impedance Analyzer or Equivalent f = 1 MHz
A0 A1 A2 GND EN V-
D RL 1 kW
VO
Channel Select
A1 A0
D GND EN V-
VInsertion Loss = 20 log
VOUT VIN
V-
FIGURE 8. Insertion Loss
Document Number: 71342 S-03720--Rev. D, 07-Apr-03
FIGURE 9. Source Drain Capacitance
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