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General Description

The MAX4539/MAX4540 low-voltage, CMOS 8-channel

(MAX4539) and dual 4-channel (MAX4540) multiplexers

are ideal for precision ADC calibration and system self-

monitoring applications. These calibration multiplexers

(cal-muxes) have precision resistor-dividers 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

1/2V+ 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 MAX4539/MAX4540 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 ±5V

or a single +5V supply. Protection diodes at all inputs

provide an ESD rating >2kV.

The MAX4539/MAX4540 operate from a single +2.7V to

+12V supply, or from dual supplies of ±2.7V to ±6V.

On-resistance (100Ω max) is matched between switch-

es to 6Ω max. Each switch can handle Rail-to-Rail

analog signals. The off leakage current is 0.1nA at

= +25°C and 2nA at T

= +85°C.

The MAX4539/MAX4540 are available in small 20-pin

DIP, SO, and SSOP packages.

Applications

Battery-Operated Equipment Avionics

Data-Acquisition Systems Audio-Signal Routing

Test Equipment 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

♦ R

: 100Ω max

♦ R

Matching Between Channels: 6Ω max

♦ Charge Injection: 5pC max

♦ Low 0.1nA Off Leakage Current

♦ Small 20-Pin SSOP/SO/DIP Packages

MAX4539/MAX4540

Low-Voltage, Single 8-to-1 and

Dual 4-to-1 Cal-Multiplexers

________________________________________________________________

Maxim Integrated Products

MAX4539

R23R

5R R2

GND

V+

V-

REFHI

15R1

4081R1

15R1

REFLO

COM

NO1

NO2

NO3

NO4

NO8

NO7

NO6

NO5

CAL

LATCH

LOGIC

DECODER

19-4780; Rev 1; 6/99

PART

MAX4539CAP

MAX4539CWP

MAX4539CPP 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 SSOP

20 Wide SO

20 Plastic DIP

Pin Configurations/

_______________Functional Diagrams

Ordering Information

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

MAX4539EAP

MAX4539EWP -40°C to +85°C

-40°C to +85°C 20 SSOP

20 Wide SO

MAX4539EPP -40°C to +85°C 20 Plastic DIP

MAX4540CAP

MAX4540CWP

MAX4540CPP 0°C to +70°C

0°C to +70°C

0°C to +70°C 20 SSOP

20 Wide SO

20 Plastic DIP

MAX4540EAP

MAX4540EWP -40°C to +85°C

-40°C to +85°C 20 SSOP

20 Wide SO

MAX4540EPP -40°C to +85°C 20 Plastic DIP

MAX4540 appears at end of data sheet.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Summary of content (20 pages)

PAGE 1
9-4780; Rev 1; 6/99 Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers 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 ♦ RON: 100Ω max ♦ RON Matching Between Channels: 6Ω max ♦ Charge Injection: 5pC max ♦ Low 0.
PAGE 2
ABSOLUTE MAXIMUM RATINGS V+ to GND ..............................................................-0.3V to +13V V- to GND ...............................................................-13V to +0.3V V+ to V-...................................................................-0.3V to +13V CAL, LATCH, A_, EN, NO_, COM_, REFHI, REFLO (Note 1) ........................(V- - 0.3V) to (V+ + 0.3V) Continuous Current (any terminal)....................................
PAGE 3
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers (V+ = +5V ±10%, V- = -5V ±10%, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC INPUTS Input High Voltage VIH Input Low Voltage VIL 2.4 Input Current with Input Voltage High IIH VEN = VA_ = VLATCH = VCAL = V+ Input Current with Input Voltage Low IIL VEN = VA_ = VLATCH = VCAL = 0 1.7 V 1.4 0.8 V -0.1 0.01 0.
PAGE 4
MAX4539/MAX4540 Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) (V+ = +5V ±10%, V- = -5V ±10%, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values at TA = +25°C.
PAGE 5
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers (V+ = +5V ±10%, V- = -5V ±10%, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS Additional Positive Supply Current (Note 3) (V+ - V-) divider active, VIH = V+, VIL = 0 Additional Negative Supply Current (V+ - V-) divider active, VIH = V+, VIL = 0 (Note 3) MIN TYP mA TA = +25°C (V+ - V-)/ (V+ - V-)/ 24k 13k mA V- 0.
PAGE 6
MAX4539/MAX4540 Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued) (V+ = +5V ±10%, V- = 0, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC INPUTS (Note 3) Input High Voltage VIH Input Low Voltage VIL 2.
PAGE 7
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers (V+ = +2.7V to +3.6V, V- = 0, VIH = 2.4V, VIL = 0.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V+ V SWITCH Analog-Signal Range On-Resistance VCOM_ RON (Note 3) ICOM_ = 0.2mA, VNO_ = 1.5V, V+ = 2.7V 0 TA = +25°C 220 TA = TMIN to TMAX 500 Ω 600 LOGIC INPUTS (Note 3) Input High Voltage VIH Input Low Voltage VIL 2.4 1.1 V 1.1 0.
PAGE 8
Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) COM(ON) 10p 40 60 TA = +25°C 50 TA = -40°C TA = +25°C 20 10 V+ = 5V V- = 0 10 0 10f 0 20 40 60 80 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCOM (V) ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) 150 80 130 RON (Ω) 90 V+ = 2.7V V- = -2.7V 70 V+ = 3V V- = -3V 60 V- = 0 V+ = 2.
PAGE 9
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers 60 ON PHASE 20 -50 -20 -60 -60 -70 -100 OFF ISOLATION -80 0.1 1 10 0.01 (V+ - V-) ROUT V+ = 5V V- = -5V 10 100 1k 10k -20 -40 100k V+ = 5V V- = -5V 80 100 2558.3 2558.2 VREFHI = 4.096V VREFLO = 0 V+ = 5V V- = -5V 4081.08 4081.06 OUTPUT RATIO (LSB) 2558.4 OUTPUT RATIO (LSB) 60 4081.10 MAX4539-13b 2558.5 MAX4539-13a 40 20 GAIN DIVIDER OUTPUT vs. TEMPERATURE (V+ - V-) DIVIDER OUTPUT vs. TEMPERATURE 2049.
PAGE 10
Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) ROUT vs. TEMPERATURE (OFFSET DIVIDER AND GAIN DIVIDER) 2054 230 220 OFFSET DIVIDER 210 V+ = 5V V- = -5V VREFHI = 4.096V VREFLO = 0 200 190 OUTPUT RATIO (LSB) GAIN DIVIDER OUTPUT RATIO (LSB) 2053 240 2052 2051 2050 2049 2048 -20 0 20 40 60 2555 2047 100 80 2560 2046 2550 2045 -40 2565 MAX4539-19b 2055 MAX4539-19a 250 (V+ - V-) DIVIDER OUTPUT vs. SUPPLY VOLTAGE (V+ / 2) DIVIDER OUTPUT vs.
PAGE 11
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers MAX4539 (Single 8-to-1 Cal-Mux) CAL A2 A1 A0 EN LATCH COM X X X X 0 X All switches and dividers open. COM is high-Z. Latch contents set to all 1’s. X X X X 1 1 State is latched when LATCH is high.
PAGE 12
MAX4539/MAX4540 Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers Detailed Description The MAX4539/MAX4540 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.
PAGE 13
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers the internal dividers connected between the supplies may inadvertently turn on, causing higher supply current (~200µA supply current) when the enable input is toggled. Avoid this condition by ensuring that EN pin 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 MAX4539/MAX4540 is off (i.e.
PAGE 14
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers MAX4539/MAX4540 Test Circuits/Timing Diagrams (continued) +5V V+ V+ EN LOGIC INPUT VA LATCH NO1–NO8 CAL A0 VA MAX4539 A2 50% 0V 90% COM GND VCOM V35pF 300Ω SWITCH OUTPUT VCOM tOPEN 0V -5V +5V V+ V+ EN LATCH NO1A–NO4B NO1B–NO4B CAL A0 VA LOGIC INPUT VA +3V MAX4540 A1 tR < 20ns t < 20ns 50% F V+ 50% 0V 0.8VNO_ 90% COMA V- GND 50Ω 50% tR < 20ns tF < 20ns 0.
PAGE 15
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers +5V RS NO_ V+ LOGIC INPUT VEN EN VS MAX4539 A0 A1 A2 CHANNEL SELECT CAL LATCH GND COM V+ ON OFF ON 0V VCOM ∆VOUT CL = 1nF VCOM ∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF.
PAGE 16
MAX4539/MAX4540 Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers Test Circuits/Timing Diagrams (continued) +5V +5V V+ V+ A2 CHANNEL SELECT NO1A NO1 A1 1MHz CAPACITANCE ANALYZER NO8 MAX4539 A0 CHANNEL SELECT COM A1 MAX4540 NO4A A0 COMA 1MHz CAPACITANCE ANALYZER f = 1MHz f = 1MHz CAL, LATCH, GND EN CAL, LATCH, GND EN V- V- -5V -5V Figure 6.
PAGE 17
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers V+ GND VREFHI 1 2 3 4 MAX4540 LOGIC DECODER 20 19 18 17 16 LATCH EN CAL A0 A1 15R 4081R 4081R REFLO COMA NO1A NO2A NO3A NO4A 5 15R 15 6 7 14 8 13 12 9 10 11 COMB NO4B NO3B NO2B NO1B ______________________________________________________________________________________ 17 MAX4539/MAX4540 Pin Configurations/Functional Diagrams (continued)
PAGE 18
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers SSOP.
PAGE 19
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers PDIPN.
PAGE 20
Low-Voltage, Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers SOICW.EPS MAX4539/MAX4540 Package Information (continued) 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.