Datasheet

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General Description

The MAX14777 quad SPST switch supports analog

signals above and below the rails with a single 3.0V to

5.5V supply. The device features a selectable -15V/+35V

or -15V/+15V analog signal range for all switches. Each

switch has a separate control input to allow independent

switching, making the device an alternative to opto-relays

in applications that do not need galvanic isolation.

The IC features 10Ω (max) on-resistance, and 9mΩ (typ)

flatness, along with a low 50nA (max at +85°C) on-

leakage. For maximum signal integrity, the device keeps

this performance over the entire common-mode voltage

range. Each switch can carry up to 60mA (max) of con-

tinuous current in either direction.

The MAX14777 is available in a 20-pin (4mm x 4mm)

TQFN package and is specified over the -40°C to +105°C

temperature range.

Applications

● Industrial Measurement Systems

● Instrumentation Systems

● 4–20mA Switching

● ATE Systems

Benets and Features

● Simple, Flexible Board Design

• -15V/+35V Beyond-the-Rails™ Signal Range from

a Single 3.0V to 5.5V Supply

• Selectable -15V/+15V Signal Range for Lower

Supply Current

• 60mA Maximum Current through Each Switch

• 1.62V to 5.5V Logic Interface

● High-Performance 10Ω R

(max)

●

150mΩ (max) R

Flatness

●

±50nA (max) On-Leakage at T

= +85°C

●

Saves Board Space

• Small 20-Pin TQFN Package (4mm x 4mm)

● -40°C to +105°C Operating Temperature Range

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX14777 related.

Beyond-the-Rails is a registered trademark of Maxim Integrated

Products, Inc.

CONFIG

BIAS

GENERATION

SEL35

EN4EN3

EN2EN1

MAX14777

MAX14777 Quad Beyond-the-Rails -15V to +35V

Analog Switch

19-6714; Rev 1; 10/13

Functional Diagram

Summary of content (16 pages)

PAGE 1
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch General Description Benefits and Features The MAX14777 quad SPST switch supports analog signals above and below the rails with a single 3.0V to 5.5V supply. The device features a selectable -15V/+35V or -15V/+15V analog signal range for all switches. Each switch has a separate control input to allow independent switching, making the device an alternative to opto-relays in applications that do not need galvanic isolation.
PAGE 2
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Absolute Maximum Ratings VN........................... the greater of -26V and (VP - 70V) to +0.3V Absolute Difference Between Switch I/Os (| A_ - B_ |)..........70V Continuous Current...........................................................±80mA Continuous Power Dissipation (TA = +70°C)............................... TQFN (derate 25.6mW/°C above +70°C)................2051.3mW Operating Temperature Range...........................
PAGE 3
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Electrical Characteristics (continued) (VCC = 3.0V to 5.5V, VL = 3.3V, TA = -40°C to +105°C, unless otherwise noted. Typical values are at VCC = 5V and TA = +25°C.
PAGE 4
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Electrical Characteristics (continued) (VCC = 3.0V to 5.5V, VL = 3.3V, TA = -40°C to +105°C, unless otherwise noted. Typical values are at VCC = 5V and TA = +25°C.
PAGE 5
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Test Circuits/Timing Diagrams V +3.3V +5V 1µF 1µF VL VCC MAX14777 A_ VIN B_ IIN GND Figure 1. On-Resistance Measurement +3.3V +3.3V +5V 1µF VIN 1µF VL VCC MAX14777 IL_OFF A 1µF 1µF VL A_ B_ GND +5V IL_OFF IL_ON A A VIN VCC MAX14777 A_ B_ GND Figure 2. Leakage Current Measurements www.maximintegrated.
PAGE 6
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Test Circuits/Timing Diagrams (continued) +3.3V 1µF +5V 1µF tR < 20ns tF < 20ns +5V VL A_ EN_ MAX14777 50Ω 50% EN_ VCC 0V +10V tON VOUT B_ 90% 10kΩ GND tOFF VOUT 10% 0V Figure 3. Enable Switching Time +3.3V VL VIN 1µF +5V 1µF VCC EN_ A_ MAX14777 SWITCH OPEN VOUT B_ RS = 50Ω GND OFF-ISOLATION = 20log RL = 50Ω CL = 15pF VOUT VIN Figure 4. Off-Isolation www.maximintegrated.
PAGE 7
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Test Circuits/Timing Diagrams (continued) +3.3V VL 1µF +5V 1µF VCC A1 VIN MAX14777 A2 RS = 50Ω EN1 SWITCH 1 CLOSED EN2 SWITCH 2 OPEN VOUT B2 GND RL = 50Ω CROSSTALK = 20log VOUT VIN Figure 5. Crosstalk +3.3V VL +5V EN_ 1µF +5V 1µF NETWORK ANALYZER VCC MAX14777 A_ B_ VIN VOUT MEAS REF GND ON-LOSS = 20log VOUT VIN Figure 6. Frequency Response www.maximintegrated.
PAGE 8
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Test Circuits/Timing Diagrams (continued) +3.3V +5V 1µF 1µF +5V VEN VL 0V VCC A_ MAX14777 GND 50Ω ON VOUT -VOUT CL = 1nF EN_ OFF 0V VOUT B_ ON VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = CL × VOUT Figure 7. Charge Injection Typical Operating Characteristics (VCC = 5V, VL = 3.3V, TA = +25°C, unless otherwise noted.) VCC = 3.3V 4.30 4.
PAGE 9
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Typical Operating Characteristics (continued) (VCC = 5V, VL = 3.3V, TA = +25°C, unless otherwise noted.) 1 0.1 CHARGE INJECTION vs. ANALOG SIGNAL VOLTAGE 450 400 0.01 TA = +125ºC 350 TA = +105ºC 300 250 TA = +85ºC 200 150 TA = +25ºC 100 TA = -40ºC 50 0.001 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 -15 TEMPERATURE (ºC) 0.6 SEL35 = LOW 0.
PAGE 10
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Typical Operating Characteristics (continued) (VCC = 5V, VL = 3.3V, TA = +25°C, unless otherwise noted.) THD+N vs. FREQUENCY MAX14777 toc11 MAX14777 toc10 RS = RL = 1kΩ PSRR vs. FREQUENCY 0 -20 -40 0.1 PSRR (dB) THD+N (%) 1 -60 -80 0.01 -100 0.02 0.2 2 100 TURN-OFF TIME vs. ANALOG SIGNAL VOLTAGE MAX14777 toc12 40 SEL35 = HIGH SEL35 = HIGH RL = 10kΩ 38 36 TURN-OFF TIME (µs) TURN-ON TIME (µs) 10 TURN-ON TIME vs.
PAGE 11
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch EN3 VL EN2 EN1 TOP VIEW EN4 Pin Configuration 15 14 13 12 11 N.C. 16 10 SEL35 B4 17 9 A4 8 A3 7 A2 6 A1 MAX14777 B3 18 B2 19 *EP 3 4 5 I.C. 2 VCC VP 1 VN + GND B1 20 TQFN 4mm x 4mm *EP = EXPOSED PAD. CONNECT EP TO VN. PIN NAME 1 VP 2 GND 3 VN 4 VCC Power-Supply Input. Bypass VCC to GND with a 1μF ceramic capacitor placed as close as possible to the device. 5 I.C. Internally Connected.
PAGE 12
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Pin Description (continued) PIN NAME FUNCTION 12 EN2 Switch 2 Control Input. Drive EN2 high to close switch 2. Drive EN2 low to open switch 2. 13 VL Logic Interface Reference Supply Input. Bypass VL to GND with a 1µF ceramic capacitor. 14 EN3 Switch 3 Control Input. Drive EN3 high to close switch 3. Drive EN3 low to open switch 3. 15 EN4 Switch 4 Control Input. Drive EN4 high to close switch 4. Drive EN4 low to open switch 4. 16 N.
PAGE 13
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch VL Supply Logic Input The MAX14777 features a separate logic supply input (VL) that sets the high and low thresholds for the logic inputs (EN_ and SEL35). This feature allows flexibility in interfacing to controllers that have a different logic level than VCC. Connect VL to a voltage between 1.62V and 5.5V for normal operation. Applications Information Non-Powered Condition To understand the behavior of the MAX14777 when not powered (i.e.
PAGE 14
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Application Example The MAX14777 can be used for designing an industrial single-supply analog input module that supports both ±15V voltages and 4mA–20mA current measurements. In this scheme, the MAX14777 switches in a 250Ω resistor, typically used for translating the current-loop current to a voltage for analog measurement, as shown in Figure 9.
PAGE 15
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Chip Information Ordering Information PART MAX14777GTP+ TEMP RANGE PIN-PACKAGE -40°C to +105°C 20 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed Pad PROCESS: BiCMOS Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only.
PAGE 16
MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 6/13 Initial release — 1 10/13 Removed reference to prereleased op amp 14 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.