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General Description
The MAX4578/MAX4579 are high-voltage, 8-channel
CMOS multiplexers. The MAX4578 and dual 4-channel
MAX4579 are ideal for precision ADC calibration and
system self-monitoring applications. These calibration
multiplexers (cal-muxes) have precision resistordividers to generate accurate voltage ratios from an
input reference voltage. The reference ratios include
15/4096 and 4081/4096 of the external reference voltage, accurate to 15 bits, and 1/2(V+) and 5/8(V+ - V-),
accurate to 8 bits. The external reference voltage as
well as ground can also be switched to the output. The
MAX4578/MAX4579 have enable inputs and address
latching. All digital inputs have 0.8V and 2.4V logic
thresholds, ensuring both TTL- and CMOS-logic compatibility when using a single +12V or dual ±15V supplies. Protection diodes at all inputs provide >2kV ESD
rating.
The MAX4578/MAX4579 operate from a single +4.5V to
+36V supply or from dual supplies of ±4.5V to ±20V.
On-resistance (350Ω max) is matched between switches to 15Ω max. Each switch can handle Rail-to-Rail
®
analog signals. The off-leakage current is 20pA at TA=
+25°C and 1.25nA at TA= +85°C.
The MAX4578/MAX4579 are available in small 20-pin
SSOP, SO, and DIP packages.
Applications
Data-Acquisition Systems
Test Equipment
Avionics
Audio Signal Routing
Networking
Features
♦ On-Chip Gain and Offset Divider Networks
Provide 15-Bit Accurate Output Ratios
♦ On-Chip V+ to GND and V+ to V- Divider Networks
Provide 8-Bit Accurate Output Ratios
♦ 350
Ω (max) R
ON
♦ 12Ω (max) RONMatching Between Channels
♦ 10pC (max) Charge Injection
♦ Guaranteed 20pA Off-Leakage Current
♦ Rail-to-Rail Signal Handling
♦ Small 20-Pin SSOP, SO, DIP Packages
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
________________________________________________________________
Maxim Integrated Products
1
CAL
A0
A1
18
17
LATCH
EN
20
19
16
LOGIC
DECODER
GND
V+
V-
REFHI
REFLO
COMA
NO1A
NO2A
NO3A
NO4A
NO4B
COMB
NO3B
NO2B
NO1B
5
1
2
3
4
6
15
14
13
12
11
7
8
9
10
4081R
15R
4081R
15R
MAX4579
19-1396; Rev 0; 10/98
PART
MAX4578CAP
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
20 SSOP
Ordering Information continued at end of data sheet.
Pin Configurations/
Functional Diagrams
Ordering Information
MAX4578CWP 0°C to +70°C 20 Wide SO
MAX4578CPP 0°C to +70°C 20 Plastic DIP
MAX4578EAP -40°C to +85°C 20 SSOP
MAX4578EWP -40°C to +85°C 20 Wide SO
MAX4578EPP -40°C to +85°C 20 Plastic DIP
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
MAX4578 appears at end of data sheet.
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—Dual ±15V Supplies
(V+ = +15V ±10%, V- = -15V ±10%, logic levels = 2.4V and 0.8V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(Voltage Referenced to GND)
V+...........................................................................-0.3V to +44V
V-............................................................................-44V to +0.3V
V+ to V-...................................................................-0.3V to +44V
CAL, LATCH A_, EN, NO_, COM_, REFHI,
REFLO (Note 1) ................................(V- - 0.3V) to (V+ + 0.3V)
Continuous Current (any terminal)....................................±30mA
Peak Current, NO_ or COM_
(pulsed at 1ms, 10% duty cycle max).........................±100mA
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 8mW/°C above +70°C) ..........................640mW
Wide SO (derate 8mW/°C above +70°C)......................800mW
Plastic DIP (derate 10.53mW/°C above +70°C) ...........842mW
Operating Temperature Ranges
MAX4578C_P/MAX4579C_P................................0°C to +70°C
MAX4578E_P/MAX4579E_P .............................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Note 1: Signals on NO_, COM_, EN, LATCH, CAL, A_ exceeding V+ or V- are clamped by internal diodes. Limit forward current to
maximum current ratings.
-0.05 0.005 0.05
MAX4579
TA= T
MIN
to T
MAX
TA= +25°C
TA= T
MIN
to T
MAX
MAX4578
TA= +25°C
TA= T
MIN
to T
MAX
TA= +25°C
TA= T
MIN
to T
MAX
TA= +25°C
TA= T
MIN
to T
MAX
TA= +25°C
COM Off-Leakage
Current (Note 5)
-0.05 0.005 0.05
I
COM_(OFF)
-3.25 3.25
nA
-0.05 0.005 0.05
V
COM_
= ±14V,
V
NO_
=
–
+
14V,
V+ = 16.5V,
V- = -16.5V
-6.5 6.5
NO Off-Leakage Current
(Note 5)
-0.02 0.001 0.02
I
NO_(OFF)
-1.25 1.25
V
NO_
=
–
+
14V, V
COM_
= ±14V,
V+ = 16.5V, V- = -16.5V
On-Resistance Matching
Between Channels
(Note 4)
PARAMETER SYMBOL MIN TYP MAX UNITS
∆R
ON
15
Ω
4 12
On-Resistance R
DS(ON)
475
Ω
Analog Signal Range
V
COM_
,
V
NO_
V- V+ V
220 350
CONDITIONS
I
COM_
= 0.2mA, V
NO_
= ±10V,
V+ = 13.5V, V- = -13.5V
I
COM_
= 0.2mA, V
NO_
= ±10V,
V+ = 13.5V, V- = -13.5V
(Note 3)
MAX4579
TA= T
MIN
to T
MAX
TA= +25°C
TA= T
MIN
to T
MAX
MAX4578
TA= +25°C
COM On-Leakage
Current (Note 5)
-0.05 0.008 0.05
I
COM_(ON)
-3.25 3.25
nA
-0.05 0.006 0.05
V
COM_
= ±14V,
V
NO_
= ±14V,
V+ = 16.5V,
V- = -16.5V
-6.5 6.5
nA
SWITCH
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
_______________________________________________________________________________________ 3
TA= T
MIN
to T
MAX
Transition Time t
TRANS
600
nsFigure 1
TA= T
MIN
to T
MAX
Enable Turn-Off Time t
OFF
300
nsFigure 3
TA= T
MIN
to T
MAX
Enable Turn-On Time t
ON
500
nsFigure 3
TA= +25°C
TA= +25°CCOM Off-Capacitance C
COM_(OFF)
14 pF
COM On-Capacitance C
COM_(ON)
20 pF
f = 1MHz, VEN= 0,
Figure 6
f = 1MHz, VEN= 2.4V,
Figure 6
TA= +25°CNO Off-Capacitance C
OFF
3 pF
f = 1MHz, VEN= 0,
Figure 6
TA= +25°C
TA= +25°C
Crosstalk Between
Channels (Note 8)
V
CT
-70 dB
Logic Input Capacitance C
IN
3 pF
VEN= 2.4V, f = 1MHz,
V
GEN
= 1Vp-p, Figure 5
f = 1MHz
TA= +25°C
TA= +25°C
Charge Injection
(Note 3)
V
CTE
3.5 0 pC
Off-Isolation V
ISO
-75 dB
CL= 1nF, V
NO_
= 0, RS= 0,
Figure 4
VEN= 0, RL= 50Ω, Figure 5
TA= +25°C
TA= +25°C 260 400
130 220
TA= +25°C
TA= +25°C
TA= +25°C 50 80
GND Supply Current I
GND
120
µA
TA= T
MIN
to T
MAX
VEN= VA_= V
LATCH
= V
CAL
= 0
or V+, V+ = 16.5V, V- = -16.5V
(Note 6)
TA= +25°C -1 0.001 1
Negative Supply Current I-
-5 5
µA
TA= T
MIN
to T
MAX
VEN= VA_= V
LATCH
= V
CAL
= 0
or V+, V+ = 16.5V, V- = -16.5V
(Note 6)
TA= T
MIN
to T
MAX
TA= +25°C
320 450
Break-Before-Make
Interval (Note 3)
t
OPEN
50 180 nsFigure 2
Input Current with Input
Voltage Low
I
IL
-1 0.001 1 µAVEN= VA_= V
LATCH
= V
CAL
= 0
Power-Supply Range ±4.5 ±20 V
50 80
Positive Supply Current I+
120
µA
VEN= VA_= V
LATCH
= V
CAL
= 0
or V+, V+ = 16.5V, V- = -16.5V
(Note 6)
PARAMETER SYMBOL MIN TYP MAX UNITS
Input High Voltage V
IH
2.4 1.9 V
Input Low Voltage V
IL
1.9 0.8 V
Input Current with Input
Voltage High
I
IH
-1 0.001 1 µAVEN= VA_= V
LATCH
= V
CAL
= V+
CONDITIONS
ELECTRICAL CHARACTERISTICS—Dual ±15V Supplies (continued)
(V+ = +15V ±10%, V- = -15V ±10%, logic levels = 2.4V and 0.8V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 2)
LOGIC INPUTS
SUPPLY
DYNAMIC CHARACTERISTICS
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
4 _______________________________________________________________________________________
TA= +25°C
Additional Positive Supply
Current (Note 3)
V+ / V+ /
24k 13k
(V+ / 2) divider active,
V
IH
= V+, V
IL
= 0
TA= T
MIN
to T
MAX
Enable Setup Time t
ES
60
nsFigure 8
TA= +25°C 22 40
TA= T
MIN
to T
MAX
(V+ - V-) Divider Output
2544 / 2560 / 2576 /
4096 4096 4096
Referenced to V- LSB
TA= +25°C
2544 / 2560 / 2576 /
4096 4096 4096
TA= T
MIN
to T
MAX
(V+ / 2) Divider Output
2032 / 2048 / 2064 /
4096 4096 4096
Referenced to GND LSB
TA= +25°C
2032 / 2048 / 2064 /
4096 4096 4096
TA= T
MIN
to T
MAX
Gain Divider Output
4080.9 / 4081 / 4081.1 /
4096 4096 4096
V
REFHI
= 10V,
REFLO = GND
LSB
TA= +25°C
4080.9 / 4081 / 4081.1 /
4096 4096 4096
TA= T
MIN
to T
MAX
Offset Divider Output
14.9 / 15 / 15.1 /
4096 4096 4096
V
REFHI
= 10V,
REFLO = GND
TA= +25°C
Output Resistance
(V+ - V-) Divider
6 9 kΩ(Note 3)
TA= +25°C
Output Resistance Gain
Divider
400 800 Ω(Note 3)
LSB
TA= +25°C
14.9 / 15 / 15.1 /
4096 4096 4096
TA= T
MIN
to T
MAX
Setup Time t
S
PARAMETER SYMBOL MIN TYP MAX UNITS
TA= +25°C
Output Resistance
(REFHI, REFLO, GND)
400 800 Ω(Note 3)
TA= +25°C
Output Resistance
(V+ / 2) Divider
6 9 kΩ(Note 3)
TA= +25°C
Output Resistance Offset
Divider
400 800 Ω(Note 3)
250
ns
TA= T
MIN
to T
MAX
Figure 7
TA= +25°C
TA= +25°C 70 200
Hold Time t
H
-10 0
ns
-10
Figure 7
CONDITIONS
mA
TA= T
MIN
to T
MAX
Pulse Width, LATCH
Enable
t
MPW
180
nsFigure 7
TA= +25°C 120 72
ELECTRICAL CHARACTERISTICS—Dual ±15V Supplies (continued)
(V+ = +15V ±10%, V- = -15V ±10%, logic levels = 2.4V and 0.8V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 2)
LATCH TIMING (Note 3)
INTERNAL DIVIDERS
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
_______________________________________________________________________________________ 5
TA= +25°C
Additional Negative
Supply Current (Note 3)
(V+-V-) / (V+ -V-) /
24k 13k
mA
(V+ - V-) divider active,
V
IH
= V+, VIL= 0
TA= +25°C
Additional Positive Supply
Current (Note 3)
(V+-V-) / (V+ -V-) /
24k 13k
mA
PARAMETER SYMBOL MIN TYP MAX UNITS
(V+ - V-) divider active,
V
IH
= V+, VIL= 0
TA= +25°C
Input Resistance
(REFHI, REFLO) (Note 3)
17 32 kΩ
Offset divider active,
gain divider active
REFHI, REFLO Input
Range (Note 3)
V- V+
- 0.3 + 0.3
V
CONDITIONS
ELECTRICAL CHARACTERISTICS—Dual ±5V Supplies
(V+ = +5V ±10%, V- = -5V ±10%, logic levels = 2.4V and 0.8V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 2)
ELECTRICAL CHARACTERISTICS—Dual ±15V Supplies (continued)
(V+ = +15V ±10%, V- = -15V ±10%, logic levels = 2.4V and 0.8V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 2)
PARAMETER MIN TYP MAX UNITSCONDITIONS
(Note 3)Analog Signal Range
V
NO_
,
V
COM_
V- V+ V
I
COM_
= 0.2mA, V
NO_
= ±3V,
V+ = 4.5V, V- = -4.5V
TA= T
MIN
to T
MAX
On-Resistance R
DS(ON)
1100
Ω
I
COM_
= 0.2mA, V
NO_
= 3.0V,
V+ = 4.5V, V- = -4.5V
TA= +25°C
On-Resistance Matching
Between Channels
(Note 4)
∆R
DS(ON)
10 Ω
660 900TA= +25°C
I
NO(OFF)
V
NO_
=
–
+
4.5V, V
COM_
= ±4.5V,
V+ = 5.5V, V- = -5.5V
TA= +25°C
NO Off-Leakage Current
(Note 5)
-0.02 0.001 0.02
TA= T
MIN
to T
MAX
-1.25 1.25
MAX4578
TA= +25°C
COM Off-Leakage
Current (Note 5)
I
COM_(OFF)
-0.05 0.005 0.05
nA
V
COM_
= ±4.5V,
1V; V
NO_
=
–
+
4.5V,
V+ = 5.5V,
V- = -5.5V
TA= T
MIN
to T
MAX
-6.5 6.5
MAX4579
TA= +25°C -0.5 0.005 0.5
TA= T
MIN
to T
MAX
-6.5 6.5
MAX4578
TA= +25°C
COM On-Leakage
Current (Note 5)
I
COM_(ON)
-0.05 0.008 0.05
nA
V
COM_
= ±4.5V,
V
NO_
= ±4.5V or
floating, V+ = 5.5V,
V- = -5.5V
TA= T
MIN
to T
MAX
-6.5 6.5
MAX4579
TA= +25°C -0.05 0.05
TA= T
MIN
to T
MAX
-3.25 3.25
SYMBOL
SWITCH
nA
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
6 _______________________________________________________________________________________
TA= T
MIN
to T
MAX
Enable Turn-Off Time t
OFF
1.3
µsV
NO1
= 3V, Figure 3
TA= T
MIN
to T
MAX
Enable Turn-On Time t
ON
1.5
µsV
NO1
= 3V, Figure 3
TA= T
MIN
to T
MAX
Transition Time t
TRANS
PARAMETER SYMBOL MIN TYP MAX UNITS
Input High Voltage V
IH
2.4 1.4 V
Input Low Voltage V
IL
1.4 0.5 V
TA= +25°C
TA= +25°C
µs
0.675 1.2
V
NO1
= 3V, V
NO8
= 0,
Figure 1
0.5 1.0
TA= +25°C
TA= +25°C
2.2
Input Current with
Input Voltage High
I
IH
-1.0 0.001 1.0 µA
Break-Before-Make
Interval
t
OPEN
200 440 nsFigure 2
VEN= VA_= V
LATCH
= V
CAL
= V+
Input Current with
Input Voltage Low
I
IL
-1.0 0.001 1.0 µA
CONDITIONS
VEN= VA_= V
LATCH
= V
CAL
= 0
ELECTRICAL CHARACTERISTICS—Dual ±5V Supplies (continued)
(V+ = +5V ±10%, V- = -5V ±10%, logic levels = 2.4V and 0.5V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 2)
ELECTRICAL CHARACTERISTICS—Single +12V Supply
(V+ = +12V, V- = 0, logic levels = 2.4V and 0.8V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
LOGIC INPUTS (Note 3)
DYNAMIC CHARACTERISTICS (Note 3)
TA= +25°C
(Note 3)
TA= T
MIN
to T
MAX
TA= T
MIN
to T
MAX
TA= +25°C
TA= +25°C
CONDITIONS
Ω
470 750
R
DS(ON)
On-Resistance
V0 V+
V
NO_
,
V
COM_
Analog Signal Range
-1.25 1.25
850
Ω
8∆R
(ON)
On-Resistance Matching
Between Channels
(Note 4)
nA
-0.02 0.001 0.02
I
NO(OFF)
NO Off-Leakage Current
(Notes 5, 9)
UNITSMIN TYP MAXSYMBOLPARAMETER
I
COM_
= 0.2mA, V
NO_
= 3V, 10V
I
COM_
= 0.2mA, V
NO_
= 3V, 10V
V
COM_
= 1V, 11V;
V
NO_
= 11V, 1V
SWITCH
1.0 1.8
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
_______________________________________________________________________________________ 7
ns
150 315
t
OFF
Enable Turn-Off Time
ns
540 800
t
ON
Enable Turn-On Time
ns120 400t
OPEN
Break-Before-Make
Interval
ns
600 850
t
TRANS
Transition Time
µA-1 0.001 1I
IH
Input Current with
Input Voltage High
V1.8 0.8V
IL
Input Low Voltage
V2.4 1.8V
IH
Input High Voltage
-3.25 3.25
-0.05 0.005 0.05
-6.5 6.5
nA
-0.05 0.005 0.05
I
COM_(OFF)
COM Off-Leakage
Current (Notes 5, 9)
UNITSMIN TYP MAXSYMBOLPARAMETER
Figure 3
Figure 3
Figure 2
V
NO1
= 8V, V
NO8
= 0, Figure 1
MAX4579
MAX4578
TA= +25°C
TA= +25°C
TA= +25°C
TA= +25°C
VEN= VA_= V
LATCH
= V
CAL
= V+
TA= +25°C
TA= T
MIN
to T
MAX
TA= +25°C
TA= T
MIN
to T
MAX
CONDITIONS
V
COM_
= 11V, 1V;
V
NO_
= 1V, 11V
TA= +25°C
TA= T
MIN
to T
MAX
TA= +25°C
TA= T
MIN
to T
MAX
-3.25 3.25
-0.05 0.05
-6.5 6.5
nA
-0.05 0.006 0.05
I
COM_(ON)
COM On-Leakage
Current (Notes 5, 9)
V
COM_
= 11V, 1V;
V
NO_
= 11V, 1V,
or floating
MAX4579
MAX4578
VEN= VA_= V
LATCH
= V
CAL
= 0 µA-1 0.001 1I
IL
Input Current with
Input Voltage Low
TA= T
MIN
to T
MAX
1100
TA= T
MIN
to T
MAX
1100
TA= T
MIN
to T
MAX
450
Note 2: The algebraic convention, where the most negative value is a minimum and the most positive value a maximum, is used in
this data sheet.
Note 3: Guaranteed by design.
Note 4: ∆R
ON
= R
ON(MAX)
- R
ON(MIN)
.
Note 5: Leakage parameters are 100% tested at maximum-rated hot temperature and guaranteed by correlation at T
A
= +25°C.
Note 6: If the logic inputs can float during power-on, connect a 1MΩ pull-up from LATCH to V+. See
Applications Information
section.
Note 7: Off-Isolation = 20log
10(VCOM
/ VNO), V
COM
= output, VNO= input to off switch.
Note 8: Between any two switches.
Note 9: Leakage parameters testing at single supply are guaranteed by correlation with dual supplies.
ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued)
(V+ = +12V, V- = 0, logic levels = 2.4V and 0.8V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
SWITCH (continued)
LOGIC INPUTS
DYNAMIC CHARACTERISTICS (Note 3)
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
8 _______________________________________________________________________________________
150
350
250
550
450
650
750
-15 -10 -5 0 5 10 15
ON-RESISTANCE vs. V
COM
(DUAL SUPPLIES)
MAX4578/79 toc 01
V
COM
(V)
R
ON
(Ω)
±4.5V
±7.5V
±10V
±15V
±12V
0
50
100
150
200
250
300
350
400
-15 -5-10 0 5 10 15
ON-RESISTANCE vs. V
COM
AND
TEMPERATURE (±15V DUAL SUPPLIES)
MAX4578/79 toc 02
V
COM
(V)
R
ON
(Ω)
TA = +70°C
TA = +85°C
V+ = +15V
V- = -15V
TA = +25°C
TA = -40°C
0
200
100
300
600
700
500
400
800
-5 -3 -2 -1 0-4 1 2 3 4 5
MAX4578/79 toc 03
V
COM
(V)
R
ON
(Ω)
ON-RESISTANCE vs. V
COM
AND
TEMPERATURE (±5V DUAL SUPPLIES)
V+ = +5V
V- = -5V
TA = -40°C
TA = +25°C
TA = +85°C
TA = +70°C
300
700
500
1300
1100
900
1900
+4.5V
1700
1500
2100
0 5.02.5 7.5 10 12.5
ON-RESISTANCE vs. V
COM
(SINGLE SUPPLY)
MAX4578/79 toc 04
V
COM
(V)
R
ON
(Ω)
+7.5V
+10V
+12V
0.0001
0.01
0.001
1
0.1
100
10
1000
-55 -15 5-35 25 45 65 85 105 125
LEAKAGE CURRENT vs. TEMPERATURE
MAX4578/79 toc 07
TEMPERATURE (°C)
LEAKAGE CURRENT (nA)
V+ = +15V
V- = -15V
I
NO (OFF)
I
COM (OFF)
I
COM (ON)
0
400
200
800
600
1200
1000
1400
1800
1600
2000
0 1.0 1.5 2.00.5 2.5 3.0 3.5 4.54.0 5.0
ON-RESISTANCE vs. V
COM
AND
TEMPERATURE (5V SINGLE SUPPLY)
MAX4578/79 toc 05
V
COM
(V)
R
ON
(Ω)
TA = -40°C
TA = +85°C
TA = +70°C
TA = +25°C
V+ = +5V
0
200
100
400
300
600
500
700
0 4 62 8 10 12
MAX4578/79 toc 06
V
COM
(V)
R
ON
(Ω)
ON-RESISTANCE vs. V
COM
AND
TEMPERATURE (12V SINGLE SUPPLY)
TA = -40°C
TA = +25°C
TA = +70°C
TA = +85°C
V+ = +12V
1m
100µ
10µ
1µ
100n
10n
1n
-40 20 40 60 80-20 0 100
SUPPLY CURRENT vs. TEMPERATURE
MAX4578/79 toc 08
TEMPERATURE (°C)
I+, I- (A)
I+
I-
0
200
100
400
300
600
500
700
5 97 11 136 108 12 14 15
TURN-ON/TURN-OFF TIME vs. SUPPLY
MAX4578/79 TOC 09
V+, V- (V)
t
ON
, t
OFF
(ns)
t
ON
t
OFF
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
_______________________________________________________________________________________
9
0
100
50
200
150
350
300
250
400
-40 0-20 20 40 60 80 100
TURN-ON/TURN-OFF
TIME vs. TEMPERATURE (±15V)
MAX4578/79 toc 10
TEMPERATURE (°C)
t
ON
, t
OFF
(ns)
t
ON
t
OFF
V+ = +15V
V- = -15V
0
200
100
400
300
800
700
500
600
900
-40 0-20 20 40 60 80 100
TURN-ON/TURN-OFF
TIME vs. TEMPERATURE (±5V)
MAX4578/79 toc 11
TEMPERATURE (°C)
t
ON
, t
OFF
(ns)
t
ON
t
OFF
V+ = +5V
V- = -5V
0
200
100
400
300
700
600
500
800
-40 0-20 20 40 60 80 100
TURN-ON/TURN-OFF
TIME vs. TEMPERATURE (12V)
MAX4578/79 toc 12
TEMPERATURE (°C)
t
ON
, t
OFF
(ns)
t
ON
t
OFF
V+ = +12V
V- = 0
-4
0
-2
4
2
±15V
±12V
±5V
8
6
10
-15 -5 0-10 5 10 15
CHARGE INJECTION vs. V
COM
MAX4578/79 toc 13
V
COM
(V)
Q (pC)
4080.900
4080.960
4080.920
4080.940
4081.040
4081.020
4081.000
4080.980
4081.080
4081.060
4081.100
1 7 93 5 11 13 152 8 104 6 12 14
GAIN DIVIDER OUTPUT
vs. V
REFHI
MAX4578/79 toc 16
V
REFHI
(V)
OUTPUT RATIO (LSB)
±5V
±15V
V
REFLO
= 0
14.900
14.960
14.920
14.940
15.040
15.020
15.000
14.980
15.080
15.060
15.100
1 7 93 5 11 13 152 8 104 6 12 14
OFFSET DIVIDER OUTPUT
vs. V
REFHI
MAX4578/79 toc 14
V
REFHI
(V)
OUTPUT RATIO (LSB)
±15V
±5V
V
REFLO
= 0
14.900
14.960
14.920
14.940
15.040
15.020
15.000
14.980
15.080
15.060
15.100
-40 0 80 10020 60-20
OFFSET DIVIDER OUTPUT
vs. TEMPERATURE
MAX4578/79 toc 15
TEMPERATURE (°C)
OUTPUT RATIO (LSB)
V
REFHI
= 10V
V
REFLO
= 0
V+ = +15V
V- = -15V
4080.900
4080.960
4080.920
4080.940
4081.040
4081.020
4081.000
4080.980
4081.080
4081.060
4081.100
-40 80 10020 60-20 0
GAIN DIVIDER OUTPUT
vs. TEMPERATURE
MAX4578/79 toc 17
TEMPERATURE (°C)
OUTPUT RATIO (LSB)
V
REFHI
= 10V
V
REFLO
= 0
V+ = +15V
V- = -15V
2060.00
2058.00
2056.00
2054.00
2052.00
2050.00
2048.00
2046.00
2044.00
2042.00
2040.00
5 7 8 96 10 11 12 1413 15
(V+ / 2) DIVIDER OUTPUT
vs. SUPPLY VOLTAGE
MAX4578/79 toc 18
V+, V- (V)
OUTPUT RATIO (LSB)
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
10 ______________________________________________________________________________________
2055
2054
2053
2052
2051
2050
2049
2048
2047
2046
2045
-40 0-20 20 60 80 100
(V+ / 2) DIVIDER OUTPUT
vs. TEMPERATURE
MAX4578/79 toc 19
TEMPERATURE (°C)
OUTPUT RATIO (LSB)
±5V
±15V
2545
2550
2555
2560
2565
2570
5 9 107 86 11 12 13 14 15
(V+ - V-) DIVIDER OUTPUT
vs. SUPPLY VOLTAGE
MAX4578/79 toc 20
V+, V- (V)
OUTPUT RATIO (LSB)
2570
2568
2566
2564
2562
2560
2558
2556
2554
2552
-40 0-20 20 60 80 100
(V+ - V-) DIVIDER OUTPUT
vs. TEMPERATURE
MAX4578/79 toc 21
TEMPERATURE (°C)
OUTPUT RATIO (LSB)
±5V
±15V
250
300
400
350
450
500
-40 0-20 20 40 60 80 100
R
OUT
vs. TEMPERATURE
(OFFSET DIVIDER AND GAIN DIVIDER)
MAX4578/79 toc 22
TEMPERATURE (°C)
R
OUT
(Ω)
GAIN DIVIDER
V+ = +15V
V- = -15V
OFFSET DIVIDER
4500
4700
4900
5500
5300
5100
5700
5900
6100
-40 0-20 20 40 60 80 100
R
OUT
vs. TEMPERATURE
(V+ / 2 DIVIDER AND V+ - V- DIVIDER)
MAX4578/79 toc 23
TEMPERATURE (°C)
R
OUT
(Ω)
(V+ / 2) DIVIDER
V+ = +15V
V- = -15V
(V+ - V-) DIVIDER
0dB
100k 10M 100M
FREQUENCY RESPONSE
MAX4578/79 toc 24
FREQUENCY (Hz)
10dB/
div
40°/div
1M
INSERTION LOSS
ON-PHASE
OFF-ISOLATION
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
______________________________________________________________________________________ 11
NAME FUNCTION
1 V+ Positive Supply Voltage
2 GND Ground
PIN
3 V- Negative Supply Voltage
4 REFHI Reference High Voltage Input
8 NO2 Channel Input 2
7 NO1 Channel Input 1
6 COM Output
5 REFLO Reference Low Voltage Input
15 A2 Address Bit 2
12 NO6 Channel Input 6
11 NO5 Channel Input 5
10 NO4 Channel Input 4
9 NO3 Channel Input 3
Pin Descriptions
16 A1 Address Bit 1
17 A0 Address Bit 0
18 CAL Calibration Control Input
19 EN Multiplexer Enable
14 NO8 Channel Input 8
13 NO7 Channel Input 7
20 LATCH Address Latch Control Input
NAME FUNCTION
1 V+ Positive Supply Voltage
2 GND Ground
PIN
3 V- Negative Supply Voltage
4 REFHI Reference High Voltage Input
8 NO2A Channel Input 2A
7 NO1A Channel Input 1A
6 COMA Multiplexer Output A
5 REFLO Reference Low Voltage Input
15 COMB Multiplexer Output B
12 NO2B Channel Input 2B
11 NO1B Channel Input 1B
10 NO4A Channel Input 4A
9 NO3A Channel Input 3A
16 A1 Address Bit 1
17 A0 Address Bit 0
18 CAL Calibration Control Input
19 EN Multiplexer Enable
14 NO4B Channel Input 4B
13 NO3B Channel Input 3B
20 LATCH Address Latch Control Input
MAX4578 (Single 8-to-1 Cal-Mux) MAX4579 (Dual 4-to-1 Cal-Mux)
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
12 ______________________________________________________________________________________
MAX4578 (Single 8-to-1 Cal-Mux)
Truth Tables
MAX4579 (Dual 4-to-1 Cal-Mux)
EN COMA
x 0
All switches and dividers open.
COMA is high-Z.
x 1 State is latched
CAL
0 1 NO1A
0 1 NO2A
1 1 Gain Divider Mode
1 1 GND
0 1 NO4A
0 1 NO3A
1 1
All switches and dividers open.
COMA is high-Z.
1 1 Offset Divider Mode
LATCH
x
1
x
x
A0
0
1
1
0
1
0
1
0
0
x
x
A1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
COMB
All switches and dividers open.
COMB is high-Z.
State is latched
NO1B
NO2B
REFLO
GND
NO4B
NO3B
All switches and dividers open.
COMB is high-Z.
REFLO
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
x
LATCH
0
0
1
1
1
1
1
0
0
1
0
0
1
1
0
0
A2
x
x
1
1
1
1
0
1
1
0
0
0
1
1
0
0
0
0
A1
x
x
0
1
1
0
1
0
1
0
1
0
0
1
0
1
1
0
A0
x
x
REFLO11
(V+ - V-) Divider, V
COM
= 2560 / 4096 (V+ - V-) 11
All switches and dividers open. COM is high-Z.11
Offset Divider Mode V
COM
= (15 / 4096) (V
REFHI
- V
REFLO
)11
Gain Divider Mode V
COM
= (4081 / 4096) (V
REFHI
- V
REFLO
)11
NO710
NO810
(V+ / 2) Divider, V
COM
= 2048 / 4096 (V+) 11
REFHI11
GND11
NO310
NO410
NO510
NO610
NO210
NO110
CAL
State is latched when LATCH is high.1x
All switches and dividers open. COM is high-Z. Latch contents set
to all 1s.
0x
COMEN
x = Don’t Care
x = Don’t Care
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
______________________________________________________________________________________ 13
Detailed Description
The MAX4578/MAX4579 are multiplexers with additional calibration features. Internal resistor-dividers generate accurate voltage ratios from an external voltage
reference, allowing zero and full-scale calibration of
ADC systems, as well as facilitation of system self-monitoring. To access the resistor-dividers, assert the CAL
pin. When CAL and ENABLE are asserted, the three
address pins select one of the various resistor-divider
or external reference outputs. The MAX4578/ MAX4579
also contain a LATCH input that allows the state of the
CAL and address signals to be captured.
Calibration Functions
The gain-divider, offset-divider, REFHI, and REFLO
modes allow calibration of offset and gain errors in
ADC systems. The gain-divider mode outputs a voltage
ratio that is 4081/4096 of V
REFHI
- V
REFLO
, accurate to
0.1/4096 or better than 15 bits. The offset-divider mode
outputs a voltage ratio that is 15/4096 of V
REFHI
-
V
REFLO
, also accurate to 0.1/4096. The REFHI mode
allows the voltage on the REFHI pin to be switched to
the output. The REFLO mode allows the voltage on the
REFLO pin to be switched to the output.
Self-Monitoring Functions
The self-monitoring functions are intended to allow an
ADC to measure its own supply voltage. The MAX4578
has an internal divide-by-two resistor string between V+
and GND that is accurate to 8 bits. It also has a 5/8
resistor string between V+ and V- that is accurate to 8
bits. This divider string allows measurement of the negative supply with a unipolar ADC. GND can also be
switched to the output, eliminating the need for an additional multiplexer channel.
__________ Applications Information
The MAX4578/MAX4579’s construction is typical of
most CMOS analog switches. There are three supply
pins: V+, V-, and GND. The positive and negative
power supplies provide drive to the internal CMOS
switches and set the limits of the analog voltage on any
switch. Reverse-biased ESD protection diodes are
internally connected between each analog signal pin
and both V+ and V-. If the voltage on any pin exceeds
V+ or V-, one of these diodes will conduct. During normal operation, these reverse-biased ESD diodes leak,
forming the only current drawn from V-.
Virtually all the analog leakage current is through the
ESD diodes. Although the ESD diodes on a given signal pin are identical, and therefore fairly well balanced,
they are reverse-biased differently. Each is biased by
either V+ or V- and the analog signal. This means their
leakage varies as the signal varies. The difference in
the two-diode leakage from the signal path to the V+
and V- pins constitutes the analog signal-path leakage
current. All analog-leakage current flows to the supply
terminals, not to the other switch terminal, which explains
how both sides of a given switch can show leakage currents of either the same or opposite polarity.
There is no connection between the analog-signal
paths and GND. The analog-signal paths consist of an
N-channel and P-channel MOSFET with their sources
and drains paralleled and their gates driven out of
phase with V+ and V- by the logic-level translators.
V+ and GND power the internal logic and logic-level
translators and set the input-logic thresholds. The logiclevel translators convert the logic levels to switched V+
and V- signals to drive the gates of the analog switches. This drive signal is the only connection between the
logic supplies and the analog supplies. All pins have
ESD protection to V+ and to V-.
Increasing V- has no effect on the logic-level thresholds, but it does increase the drive to the P-channel
switches, which reduces their on-resistance. V- also
sets the negative limit of the analog-signal voltage.
The logic-level thresholds are CMOS- and TTLcompatible when V+ is greater than +4.5V.
Bipolar-Supply Operation
The MAX4578/MAX4579 operate with bipolar supplies
between ±4.5V and ±20V. The V+ and V- supplies need
not be symmetrical, but their sum cannot exceed the
absolute maximum rating of 44V. Note: Do not connect
the MAX4578/MAX4579 V+ pin to +3V AND connect
logic-level input pins to TTL logic-level signals. TTL
logic-level outputs can exceed the absolute maximum
ratings, which will cause damage to the part and/or
external circuits.
Single-Supply Operation
The MAX4578/MAX4579 operate from a single supply
between +4.5V and +36V when V- is connected to GND.
All of the bipolar precautions must be observed (see
Bipolar Supply Operation
section). However these parts
are optimized for ±15V operation, and most AC and DC
characteristics are degraded significantly when departing from ±15V. As the overall supply voltage (V+ to V-) is
lowered, switching speed, on-resistance, off-isolation,
and distortion will degrade, and supply current will
decrease (see the
Typical Operating Characteristics
section).
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
14 ______________________________________________________________________________________
Single-supply operation also limits signal levels and
interferes with ground referenced signals. When V- = 0,
AC signals are limited to -0.3V. Voltages below -0.3V
can be clipped by the internal ESD-protection diodes,
and the parts can be damaged if excessive current
flows.
Power Up
During power up, on-chip latches will strobe whatever
addresses are present if EN goes high before LATCH
reaches a logic high. When this condition occurs, one
of the internal dividers connected between the supplies
may immediately turn on, causing higher supply current
(1.4mA) when the enable input is toggled. Avoid this
condition by ensuring that EN stays low until the
remaining logic inputs are valid. To accomplish this,
connect a resistor from EN to ground or apply a low
voltage to EN before the other logic inputs go high.
Power Off
When power to the MAX4578/MAX4579 is off (i.e., V+ =
V- = 0), the Absolute Maximum Ratings still apply. This
means that neither logic-level inputs on NO_ nor signals on COM_ can exceed ±0.3V. Voltages beyond
±0.3V cause the internal ESD-protection diodes to conduct, and the parts can be damaged if excessive current flows.
______________________________________________Test Circuits/Timing Diagrams
50%
50%
t
R
< 20ns
t
F
< 20ns
V
COM
-15V
0V
V
NO1
, V
NO1B
0V
V
NO8
, V
NO4B
LOGIC
INPUT
V
EN
SWITCH
OUTPUT
+15V
-15V
GND
V+
V+
V+
A1
A2
V-
EN
LATCH
CAL
A0
NO1
NO2–NO7
NO8
COM
+5V
-5V
50Ω
MAX4578
1k
10pF
A1
A0
+15V
V
COM
V
COM
-15V
GND
V+
V-
EN
NO1B
NO2B–NO3B
NO1A–NO2A
NO4B
COMB
+5V
50Ω
MAX4579
1k
10pF
90%
90%
t
TRANS
t
TRANS
-5V
LATCH
CAL
Figure 1. Transition Time
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
______________________________________________________________________________________ 15
50% 50%
50%
t
OPEN
tR < 20ns
t
F
< 20ns
0.8V
NO_
+5V
0V
LOGIC
INPUT
V
A
SWITCH
OUTPUT
V
COM
+15V
V
COM
-15V
GND
V+
V-
A0
A1
A2
EN
NO1–NO8
COM
+5V
50Ω
MAX4578
1k
10pF
90%
V+
0V
V
A
LATCH
CAL
50%
90% 90%
t
OPEN
tR < 20ns
t
F
< 20ns
0.8V
NO_
+5V
0V
LOGIC
INPUT
V
A
SWITCH
OUTPUT
V
COM
+15V
V
COM
-15V
GND
V+
V-
A0
A1
EN
NO1A–NO4B
NO1B–NO4B
COMA
+5V
50Ω
MAX4579
1k
10pF
0V
V
A
V+
LATCH
CAL
Figure 2. Break-Before-Make Interval
Test Circuits/Timing Diagrams (continued)
50%
50%
t
OFF
tR < 20ns
t
F
< 20ns
+5V
0V
0V
V
EN
V
COM
+15V
V
COM
-15V
GND
V+
A1
V-
A0
A1
EN
LATCH
CAL
NO1
NO2–NO8
COM
+5V
50Ω
MAX4578
1k
10pF
A2
90%90%
t
ON
+15V
V
COM
-15V
GND
V+
A0
V-
EN
NO1B
NO2B–NO4B
NO1A–NO4A
COMB
+5V
50Ω
MAX4579
1k
10pF
V
EN
V
EN
0.8(V
NO1
, V
NO1B
)
LATCH
CAL
Figure 3. Enable Switching Time
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
16 ______________________________________________________________________________________
∆V
OUT
+5V
0V
LOGIC
INPUT
V
EN
+15V
V
COM
-15V
GND
V+
A1
V-
A0
EN
COM
MAX4578
CL = 100pF
V
COM
NO_
CHANNEL
SELECT
R
S
V
S
OFFON ON
∆V
OUT
IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ∆V
OUT · CL
A2
CAL
LATCH
∆V
OUT
+5V
0V
LOGIC
INPUT
V
EN
+15V
V
COM
GND
V+
A1
V-
A0
EN
COMA
MAX4579
CL = 100pF
V
COM
NO_
CHANNEL
SELECT
R
S
V
S
OFFON ON
∆V
OUT
IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ∆V
OUT · CL
CAL
LATCH
-15V
Figure 4. Charge Injection
_________________________________Test Circuits/Timing Diagrams (continued)
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
______________________________________________________________________________________ 17
MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM AND “OFF” TERMINAL ON EACH SWITCH.
ON LOSS IS MEASURED BETWEEN COM AND “ON” TERMINAL ON EACH SWITCH.
NOTES:
+15V
V+
V+
V
COM
GND
V-
CALLATCH
-15V
10nF
V+
A
EN
NO_
COM_
V
IN
MAX4578
MAX4579
OFF-ISOLATION = 20log
V
OUT
V
IN
CROSSTALK = 20log
V
OUT
V
IN
NETWORK
ANALYZER
50Ω
50Ω 50Ω
50Ω
MEAS. REF
10nF
Figure 5. Off-Isolation/Crosstalk
_________________________________Test Circuits/Timing Diagrams (continued)
CAL,
GND
LATCH,
EN
+15V
-15V
V+
A2
V-
A1
A0
NO8
MAX4578
CHANNEL
SELECT
NO1
COM
1MHz
CAPACITANCE
ANALYZER
f = 1MHz
CAL,
GND
LATCH,
EN
+15V
-15V
V+
V-
A1
A0
NO4A
MAX4579
CHANNEL
SELECT
NO1A
COMA
1MHz
CAPACITANCE
ANALYZER
f = 1MHz
Figure 6. NO_/COM_ Capacitance
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
18 ______________________________________________________________________________________
LATCH
LATCH
NO2
+5V
+15V
-15V
NO1, NO3–NO8
A1
A2
CAL
A0
COM
ADDRESS (A_)
t
MPW
V
IN
V
IL
t
S
t
H
50% 50%
NOTE: TIMING MEASUREMENT REFERENCE LEVEL IS
V
IH
- V
IL
2
MAX4578
EN V+
V-GND
Figure 7. Setup Time, Hold Time, Latch Pulse Width Figure 8. Enable Setup Time
_________________________________Test Circuits/Timing Diagrams (continued)
+15V
EN V+
+5V
NO2
NO1, NO3–NO8
A1
A2
CAL
LATCH
EN
MAX4578
50%
V-GND
-15V
LATCH
COM
50%
A0
t
ES
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
______________________________________________________________________________________ 19
MAX4578
R23R
5R R2
GND
V+
V-
REFHI
15R1
4081R1
4081R1
15R1
REFLO
COM
NO1
NO2
NO3
NO4
NO8
NO7
NO6
NO5
5
4
3
2
1
6
7
8
9
10
14
13
12
11
CAL
A0
A1
A2
18
17
LATCH
EN
20
19
16
15
LOGIC
DECODER
Pin Configurations/
Functional Diagrams (continued)
MAX4578/MAX4579
High-Voltage, Single 8-to-1/
Dual 4-to-1 Cal-Multiplexers
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Ordering Information (continued)
Package Information
PART
MAX4579CAP
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
20 SSOP
MAX4579CWP 0°C to +70°C 20 SO Wide
MAX4579CPP 0°C to +70°C 20 Plastic DIP
MAX4579EAP -40°C to +85°C 20 SSOP
MAX4579EWP -40°C to +85°C 20 SO Wide
MAX4579EPP -40°C to +85°C 20 Plastic DIP
SSOP.EPS
___________________Chip Information
TRANSISTOR COUNT: 520
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