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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PS398/PS399
Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Features
* Low On-Resistance (60-ohm typ.) Minimizes Distortion and Error Voltages * Low Glitching Reduces Step Errors and Improves Settling Times. Charge Injection: <5pC * Split-Supply Operation (+3V to +8V) * Improved Second Sources for MAX398/MAX399 * On-Resistance Matching Between Channels: <6Ohm * On-Resistance Flatness: <11-ohm * Low Off-Channel Leakage, INO(OFF) < 1nA @ +85oC, ICOM(ON), <2.5nA @ +85oC * TTL/CMOS Logic Compatible * Fast Switching Speed, tTRANS <250ns * Break-Before-Make action eliminates momentary crosstalk * Rail-to-Rail Analog Signal Range * Low Power Consumption, <300W * Packaging (Pb-free & Green available): - 16-pin SOIC (W)
Description
The PS398/PS399 are improved high precision analog multiplexers. The PS398, an 8-channel single-ended mux, selects one of eight inputs to a common output as determined by a 3-bit address A0-A2. An EN (enable) pin when low disables all switches, useful when stacking several devices. The PS399 is a 4-channel differential multiplexer. It selects one of four differential inputs to a common differential output as determined by a 2-bit address A0, A1. An EN pin may be driven low to disable all switches. These multiplexers operate with dual supplies from +3V to +8V. Single-supply operation is possible from +3V to +15V. With +5V power supplies, the PS398/PS399 guarantee <100-ohm on-resistance. On-Resistance matching between channels is within 6-ohm. On-Resistance flatness is less than 11-ohm over the specified signal range. Each switch conducts current equally well in either direction when on. In the off state each switch blocks voltages up to the powersupply rails. Both devices guarantee low leakage currents (<2.5nA at +85oC) and fast switching speeds (tTRANS <250ns). Break-before-make switching action protects against momentary crosstalk between channels.
Applications
* * * * * * Data Acquisition Systems Audio Switching and Routing Test Equipment PBX, PABX Telecommunication Systems Battery-Powered Systems
Block Diagrams and Pin Configurations
PS398
A0 EN VNO1 NO2 1 2 3 4 5
Decoders/Drivers
PS399
16 A1 AO EN V1 2 3
Decoders/Drivers
16
A1
15 A2 14 GND 13 V+ 12 NO5 11 NO6 10 NO7 9 NO8
15 GND 14 V+ 13 NO1B 12 NO2B 11 NO3B 10 NO4B 9 COMB
NO1A 4 NO2A 5 NO3A 6 NO4A 7 COMA 8
NO3 6 NO4 7 COM 8
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PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Truth Tables
PS398 A2 X 0 0 0 0 1 1 1 1 A1 X 0 0 1 1 0 0 1 1 A0 X 0 1 0 1 0 1 0 1 EN 0 1 1 1 1 1 1 1 1 On Switch None 1 2 3 4 5 6 7 8
PS399 A1 X 0 0 1 1 A0 X 0 1 0 1 EN 0 1 1 1 1 ON Switch None 1 2 3 4
Logic "0", VAL 0.8V Logic "1", VAH 2.4V
Absolute Maximum Ratings
Voltages Referenced to VV+ ....................................................................... -0.3V to + 17V GND .................................................................... -0.3V to + 17V GND ........................................................... -0.3V to ( V+) + 0.3V VIN, VCOM, VNO (Note 1) ................... (V-) -2V to (V+) + 2V or 30mA, whichever occurs first Current (any terminal ) ......................................................... 30mA Peak Current, COM, NO, NC (pulsed at 1ms, 10% duty cycle) ..................................... 100mA ESD per method 3015.7 .................................................. > 2000V
Thermal Information Continuous Power Dissipation SOIC (derate 8.7mW/ C above +70C) ........................... 650mW Storage Temperature ........................................ -65C to +150C Lead Temperature (soldering, 10s) .................................. +300C
Note 1: Signals on NO, COM, or logic inputs exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to 30mA.
Caution: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied.
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PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Electrical Specifications - Dual Supplies (V = 5V 10%, GND = 0V, VAH = VENH = 2.4V, VAL = VENL = 0.8V)
Parame te r Analog Switch Analog Signal Range (3) VANALOG On Resistance V+ = 4.5V, V- = - 4.5V, VCOM = 3.5V INO = 1mA, VCOM or VNC = 3.5V, INO = 1mA, V+ = 5V, V- = - 5V Full 25 Full 25 Full 25 Full 25 Full P S 398 25 Full 25 Full 25 Full P S 399 Logic Input Logic High Input Voltage Logic Low Input Voltage Input Current with Input Voltage High Input Current with Input Voltage Low VAH, VENH VAL, VENL Full IAH, IENH VA = VEN = 2.4V - 0.1 0.1 A IAL, IENL VA = VEN = 0.8V - 0.1 0.1 2.4 V 0.8 25 Full - 0.1 - 1.0 - 0.2 - 2.5 - 0.1 - 1.5 - 0.4 -5 - 0.2 - 2.5 V60 V+ 100 125 6 8 11 14 0.1 1.0 50 100 50 100 0.4 5 0.2 2.5 nA Ohm V Symbol Conditions Te mp. (C) M in.(2) Typ.(1) M ax.(2) Units
RON
On- Resistance Match Between Channels(4)
RON
On- Resistance Flatness(5) NO Off Leakage Current(6)
RFLAT(ON)
INO
V+ = 5V, V- = - 5V, = 1mA, VCOM = 3V, 0V V+ = 5.5V, V- = - 5.5V, VCOM = 4.5V, VNO = 4.5V
INO(OFF)
COM- Off Leakage Current(6)
ICOM(OFF)
V+ = 5.5V, V- = - 5.5V VCOM = 4.5V, VNO = - /+4.5V
P S 399
P S 398 COM On Leakage Current(7) ICOM(ON) V+ = 5.5V, V- = - 5.5V VCOM = 4.5V VNO = 4.5V
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PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Electrical Specifications - Dual Supplies (V = 5V 10%, GND = 0V, VAH = VENH = 2.4V, VAL = VENL = 0.8V)
(continued)
Parame te r Dynamic Transition Time Break- Before- Make Time Delay Enable Turn- OnTime
Symbol
Conditions
Te mp(C)
M in.(1)
Typ.(2) M ax.(1)
Units
tTRANS tOPEN tON(EN)
Figure 1 Figure 3 Figure 2 25 Full 25 Full 2.8 - 101 - 92 2.5 25 3.6 31 14 35 20 55 0 40 72
150
150 250 150 200 5
ns
Enable Turn- Off Time Charge Injection(3) Off Isolation(7) Crosstalk Logic Input Capacitance NO Off Capacitance COM Off Capacitance
tOFF(EN) Q OIRR XTALK CIN CNO(OFF) CCOM(OFF)
Figure 2 CL= 1nF, VS = 0V, RS = 0Ohm, VEN = 0V, RL= 1kOhm, f = 100kHz RL = 1kOhm, f = 100kHz, Figure 6 f =1MHz f =1MHz, VEN = VNO = 0V f =1MHz, VEN = VCOM =0V f =1MHz, VCOM = 0V P S 398 P S 399 P S 398 P S 399
pC dB
pF
COM On Capacitance Supply Power- Supply Range Positive Supply Current NegativeSupply Current Ground Current
CCOM(ON)
3 I+ IIGND VEN = VA = 0V or V+, V+ =5.5V, V- = - 5.5V Full -1 -1 -1
8 1 1 1
V
A
Notes: 1. Algebraic convention, where the most negative value is a minimum and the most positive is a maximum, is used in this data sheet. 2. Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing. 3. Guaranteed by design. 4. RON = RON max - RON min. 5. Flatness is defined as the difference between the maximum and minimum values of on-resistance measured. 6. Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25C. 7. Off Isolation = 20log10 VCOM / VNO. See Figure 5.
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PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Electrical Characteristics - Single 5V Supply
(V+ = + 5V 10%, V- = 0V, GND = 0V, VAH = VENH = +2.4, VAL = VENL = +0.8V)
Parame te r Switch Analog Signal Range(3) On Resistance
Symbol
Conditions
Te mp(C) M in.(1)
Typ.(2)
M ax.(1)
Units
VCOM, VNO RON INO = 1mA, VCOM = 3.5V, V+ = 4.5V INO = 1mA, VCOM = 3.5V, V+ = 4.5V INO = 1mA, VCOM = 1.5V, 2.5V, 3.5V, V+ = 5V VNO = 4.5V, VCOM = 0V, V+ = 5.5V P S 398
Full 25 Full 25 Full 25 Full 25 Full 25 Full 25 Full 25 Full 25 Full
0 100
V+ 225 280 11 13 18 22
V
RON Matching Between Channels(4) On - Resistance Flatness NO- Off Leakage Current(8)
RON
Ohm
RFLAT
INO(OFF)
- 0.1 - 1.0 - 0.2 - 2.5 - 0.2 - 1.5 - 0.4 -5 - 0.2 - 2.5
0.1 1.0 50 100 50 100 0.4 5 0.2 2.5 n
COM- Off Leakage Current(8)
ICOM(OFF)
VCOM = 4.5V, VNO =0V, V+ = 5.5V
P S 399
COM- On Leakage Current(8)
ICOM(ON)
VCOM = 4.5V, VNO =4.5V, V+ = 5.5V
P S 398
P S 399
Digital Logic Input Logic High Input Voltage Logic Low Input Voltage Input Current with Input Voltage High Input Current with Input Voltage Low Supply Power- Supply Range Positive- Supply Current Negative- Supply Current Ground Current V+ I+ IIGND VEN = V+ or 0V, VA = 0V, V+ = 5.5V, V- = 0V Full 3 - 1.0 - 1.0 - 1.0 15 1.0 1.0 1.0 V VAH, VENH VAH, VENL IAH, IENH IAH, IENL VA= VEN = 2.4V VA= VEN = 0.8V Full - 0.1 - 0.1 2.4 0.8 0.1 A 0.1 V
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PS8185F
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Electrical Characteristics - Single 5V
(V+ = +5V 10%, V- = 0V, GND = 0V, VAH = VENH = +2.4, VAL = VENL= +0.8V (continued)
Parame te r Dynamic Transition Time Break- Before- Make Interval Enable Turn- On Time
Symbol
Conditions
Te mp(C)
M in.(1)
Typ.(2)
M ax.(1)
Units
tTRANS tOPEN tON(EN)
VNO = 3V
72 25 10 36 110 Full 25 Full 65
245
200 275 125 200
ns
Enable Turn- Off Time Charge Injection(3)
tOFF(EN) Q CL = 1nF, VS = 0V, RS = 0Ohm
25
2.8
5
pC
Electrical Characteristics - Single 3V Supply
(V+ = +3V 10%, V- = 0V, GND = 0V, VAH = VENH = +2.4, VAL = VENL = +0.8V)
Parame te r Switch Analog Signal Range(3) On- Resistance Dynamic Transition Time(3) Enable Turn- OnTime(3) Enable Turn- Off Time(3) Charge Injection (3)
Symbol
Conditions
Te mp.(C) M in.(1)
Typ.(2)
M ax.(1)
Units
VANALOG RON INO = 1mA, VCOM = 1.5V, V+ = 3V
Full 25 Full
0 160
V+ 375 425
V Ohm
tTRANS tON(EN) tOFF(EN) Q
Figure 1, VIN = 2.4V VNO1 = 1.5V, VNO8 = 0V Figure 2, VINH = 2.4V VINL = 0V, VNO1 = 1.5V Figure 2, VINH = 2.4V VINL = 0V, VNO1 = 1.5V CL = 10nF, VS = 0V, RS = 0Ohm 25
200 200 92 2
575 500 400 5 pC ns
Notes: 1. The algebraic convention, where the most negative value is a minimum and the most positive is a maximum, is used in this data sheet. 2. Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing. 3. Guaranteed by design 4. R = R max - R min 5. Flatness is defined as the difference between the maximum and minimum value of on-resistance measured. 6. Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25C. 7. Worst-case isolation is on channel 4 because of its proximity to the COM pin. Off isolation = 20log VCOM/VNO, VCOM = output, VNO = input to off switch 8. Leakage testing at single supply is guaranteed by testing with dual supplies.
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PS8185F
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PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Test Circuits/Timing Diagrams
Figure 1. Transition Time
Figure 2. Enable Switching Time
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PS8185F
09/28/04
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PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Figure 3. Break-Before-Make Interval
+5V RS VEN VS Channel Select NO EN A0 A1 A2 V+ Logic Input VEN COM VOUT +3V 0FF 0VX C VOUT ON 0FF
PS398
GND
V-
CL=1000pF
VOUT
-5V
V OUT
IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER WHEN THE CHANNEL TURNS OFF.
V OUT x C L
Figure 4. Charge Injection
Figure 5. Off Isolation
Figure 6. CrossTalk
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PS8185F
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PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
+5V A2 Channel Select A1 V+ N01 N08 1MHz Capacitance Analyzer f =1MHz
PS398
A0 GND EN V- COM -5V
Figure 8. NO/COM Capacitance
Applications
Overvoltage Protection Proper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maximum ratings, because stresses beyond the listed ratings may cause permanent damage to the devices. Always sequence V+ on first, followed by V-, and then logic inputs. If power-supply sequencing is not possible, add two small signal diodes or two current limiting resistors in series with the supply pins for overvoltage protection (Figure 9). Adding diodes reduces the analog signal range, but low switch resistance and low leakage characteristics are unaffected. Maximum Sampling Rate From the sampling theorem, the sampling frequency needed to properly recover the original signal should be more than twice its maximum component frequency. In real applications, sampling at three or four times the maximum signal frequency is customary. The maximum sampling rate of a multiplexer is determined by its transition time (tTRANS), the number of channels being multiplexed, and the settling time (tSETTLING) of the sampled signal at the output. The maximum sampling rate is:
NO Positive Supply
Where n = number of channels scanned: 8 for PS398, 4 for PS399. tTRANS is given on the specification table: 150 ns max. Settling time is the time needed for the output to stabilize within the desired accuracy band of +1 LSB (least significant bit). Other factors determining settling time are: signal source impedance, capacitive load at the output. Figure 10 illustrates the steady state model. To figure out what the settling time due to the multiplexer is, we can assume that RS = 0, and CL = 0. In real life, the effects of RS and CL should be taken into account when performing these calculations.
V+
COM
fS =
1 _______________ n (tTRANS + tSETTLING)
(1)
Vg V-
Figure 9. Overvoltage protection is accomplished using two external blocking diodes or two current limiting resistors.
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PS8185F 09/28/04
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PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
RON
V IN RS CCOM(ON) VS CL
Figure 10. Equivalent model of one multiplexer channel
The table below shows how many time constants (m) are needed to reach an accuracy of one LSB. = RON x CCOM(ON) Bits 8 12 15 Accuracy (%) 0.25 0.012 0.0017 m 6 9 11
In equation (1) above, n = 8, tTRANS = 150ns, tSETTLING = 9,
= 100ohm x 54pF
1 fS = _______________________ , 8 [150ns + 9(100ohm x 54pF)] or fS = 630kHz. Assuming a x4 oversampling rate, the maximum sampling speed for the PS398 would be 630/4 = 157kHz.
Now, let's calculate what the maximum sampling rate for the PS398. Assume a 12-bit accuracy and room temperature operation.
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PS8185F
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PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Packaging Mechanical: 16-pin SOIC (W)
16
.149 .157
3.78 3.99 .0099 .0196 0.25 x 45 0.50
1 .386 .393 9.80 10.00 .0155 .0260 0.393 0.660 REF .053 .068 1.35 1.75 SEATING PLANE 0-8 0.41 1.27 .016 .050 .0075 .0098 0.19 0.25
.2284 .2440 5.80 6.20
.050 BSC 1.27
.013 .020 0.330 0.508
.0040 0.10 .0098 0.25
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
Ordering Information
Ordering Code PS398CSE PS398CSEE PS398ESE PS398ESEE PS399CSE PS399CSEE PS399ESE PS399ESEE Package Code W W W W W W W W Package Type 16-pin SOIC Pb-free & Green, 16-pin SOIC 16-pin SOIC Pb-free & Green, 16-pin SOIC 16-pin SOIC Pb-free & Green, 16-pin SOIC 16-pin SOIC Pb-free & Green, 16-pin SOIC
Notes: 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com
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PS8185F 09/28/04

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