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. The IC features 10Ω (max) on-resistance, and 9mΩ (typ) RON flatness, along with a low 50nA (max at +85°C) onleakage. 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 continuous current in either direction. ● 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 RON (max) ● 150mΩ (max) RON Flatness ● ±50nA (max) On-Leakage at TA = +85°C ● Saves Board Space • Small 20-Pin TQFN Package (4mm x 4mm) 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. ● -40°C to +105°C Operating Temperature Range Applications Beyond-the-Rails is a registered trademark of Maxim Integrated Products, Inc. ● ● ● ● Industrial Measurement Systems Instrumentation Systems 4–20mA Switching ATE Systems Ordering Information appears at end of data sheet. Functional Diagram SEL35 VL VCC CONFIG BIAS GENERATION VP VN MAX14777 A1 B1 A2 B2 A3 B3 A4 B4 EN1 EN2 EN3 EN4 For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX14777 related. 19-6714; Rev 1; 10/13 MAX14777 Quad Beyond-the-Rails -15V to +35V Analog Switch Absolute Maximum Ratings (All voltages referenced to GND, unless otherwise noted.) VCC...........................................................................-0.3V to +6V VL.............................................................................-0.3V to +6V EN1, EN2, EN3, EN4, SEL35, I.C............................-0.3V to +6V A1, A2, A3, A4, B1, B2, B3, B4......... (VN - 0.3V) to the lesser of (VP + 0.3V) and (VN + 70V) VP SEL35 = High......................................................-0.3V to +70V SEL35 = Low......................................................-0.3V to +48V VP to VN.................................................................-0.3V to +70V 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...........................-40ºC to +105ºC Junction Temperature....................................................... +150ºC Storage Temperature Range..............................-65ºC to +150°C Lead Temperature (soldering, 10s).................................. +300°C Soldering Temperature (reflow)........................................+260°C 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. Package Thermal Characteristics (Note 1) Junction-to-Ambient Thermal Resistance (θJA) TQFN............................................................................39°C/W Junction-to-Case Thermal Resistance (θJC) TQFN..............................................................................6°C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (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.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Supply Voltage Range VL Supply Voltage Range VCC Supply Current VL Supply Current Analog Signal Range VCC 3.0 5.5 V VL 1.62 5.5 V ICC IL VA_ ,VB_ VCC = 3.3V, VEN_ = VL SEL35 = low 1.8 3.4 SEL35 = high 2.2 4.3 VCC = 5.5V, VEN_ = VL SEL35 = low 0.6 1.2 0.8 1.65 SEL35, EN_ = low or high -1 +1 SEL35 = low -15 +15 SEL35 = high -15 +35 SEL35 = low 22.5 27.1 SEL35 = high 41.7 49.8 -18.2 -14.9 V -60 +60 mA Positive High-Voltage ChargePump Output (Note 3) VP Negative High-Voltage ChargePump Output VN (Note 3) Continuous Current Through Switch IA_ EN_ = high www.maximintegrated.com SEL35 = high mA µA V V Maxim Integrated │ 2 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.) (Note 2) PARAMETER On-Resistance, Figure 1 On-Resistance Flatness On-Resistance Matching Between Channels A_ Off-Leakage Current B_ Off-Leakage Current On-Leakage Current A_ Power-Off Leakage Current B_ Power-Off Leakage Current SYMBOL RON ΔRON ΔRON_M IL_OFF_A IL_OFF_B IL_ON IL_PWROFF_A IL_PWROFF_B TYP MAX -15V ≤ VA_ ≤ +35V, SEL35 = high, IIN = ±60mA, Figure 1 CONDITIONS MIN 4.4 10 -15V ≤ VA_ ≤ +15V, SEL35 = low, IIN = ±60mA, Figure 1 4.4 10 -15V ≤ VA_ ≤ +35V, SEL35 = high, IIN = ±60mA 9 150 -15V ≤ VA_ ≤ +15V, SEL35 = low, IIN = ±60mA 8 150 Ω mΩ -15V ≤ VA_ ≤ +35V, SEL35 = high, IIN = ±60mA, (Note 4) -15V ≤ VA_ ≤ +15V, SEL35 = low, IIN = ±60mA, (Note 4) -15V ≤ VA_ ≤ +35V, SEL35 = high, VB_ = 0V, +40°C ≤ TA ≤ +85°C, Figure 2 -15V ≤ VA_ ≤ +35V, SEL35 = high, VB_ = 0V, +40°C ≤ TA ≤ +105°C, Figure 2 -15V ≤ VB_ ≤ +35V, SEL35 = high, VA_ = 0V, +40°C ≤ TA ≤ +85°C, Figure 2 -15V ≤ VB_ ≤ +35V, SEL35 = high, VA_ = 0V, +40°C ≤ TA ≤ +105°C, Figure 2 -15V ≤ VA_ ≤ +35V, SEL35 = high, B_ unconnected, +40°C ≤ TA ≤ +85°C, Figure 2 -15V ≤ VA_ ≤ +35V, SEL35 = high, B_ unconnected, +40°C ≤ TA ≤ +105°C, Figure 2 VCC_ = 0V or unconnected, -15V ≤ VA_ |VA_ - VB_| > 3V, ≤ +35V current measured at A VCC_ = 0V or unconnected, |VA_ - VB_| > 3V, current measured at B -15V ≤ VA_ ≤ +35V UNITS 200 mΩ 200 -20 +20 nA -80 +80 -20 +20 nA -80 +80 -50 +50 nA -200 +200 -5 +5 µA -5 +5 µA 0.3 x VL V DIGITAL LOGIC (EN1, EN2, EN3, EN4, SEL35) Input Voltage Low VIL Input Voltage High VIH Input Leakage Current www.maximintegrated.com IDLKG 0.7 x VL VEN_ = low or high -1 V +1 µA Maxim Integrated │ 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.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS AC CHARACTERISTICS Power-Up Time Enable Turn-On Time Enable Turn-Off Time Off-Isolation Crosstalk -3dB Bandwidth Total Harmonic Distortion Charge Injection Input Capacitance tPWRON CVP = CVN = 10nF (Note 6) 5 ms VA_ = ±10V, SEL35 = low, RL = 10kΩ, Figure 3 40 VA_ = ±10V, SEL35 = high, RL = 10kΩ, Figure 3 40 tOFF VA_ = ±10V, RL = 10kΩ, Figure 3 (Note 5) 100 VCC = 3V to 5.5V -88 VISO VA_ = 1VRMS, f = 100kHz, RL = 50Ω, CL = 15pF, Figure 4 VCC = 0V or unconnected -66 VA_ = 1VRMS, f = 100kHz, RS = RL = 50Ω, Figure 5 VCC = 3V to 5.5V -101 VCC = 0V or unconnected -93 tON VCT BW THD+N Q VA_ = 1VP-P, RS = RL = 50Ω, Figure 6 RS = RL = 1kΩ, f = 20Hz to 20kHz µs µs dB dB 380 MHz 0.038 % VA_ = GND, CL = 1nF, Figure 7 225 pC CON A_, B_ pins, f = 1MHz 16 pF COFF At A_ when B_ = GND, or at B_ when A_ = GND, f = 1MHz 12 pF Temperature rising 160 °C 32 °C ±2 kV THERMAL SHUTDOWN Thermal Shutdown Threshold TSHDN Thermal Shutdown Hysteresis THYST ESD PROTECTION All Pins Note Note Note Note Note Human Body Model 2: All units are 100% production tested at +85°C. Specifications over temperature are guaranteed by design. 3: Do not use VP or VN to power external circuitry. 4: Tested at -1V, guaranteed by design for -15V ≤ VA_ ≤ +35V. 5: This parameter does not depend on the status of SEL35. 6: Power-up time is the time needed of VP and VN to reach steady-state values. www.maximintegrated.com Maxim Integrated │ 4 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.com Maxim Integrated │ 5 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.com Maxim Integrated │ 6 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.com Maxim Integrated │ 7 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 4.25 8 TA = +105ºC 7 6 5 TA = +85ºC 4 3 TA = +25ºC 2 VCC = 5V TA = +125ºC SEL35 = HIGH ILOAD = 60mA TA = -40ºC 100 10 OFF-LEAKAGE CURRENT vs. TEMPERATURE MAX14777 toc03 9 OFF-LEAKAGE CURRENT (nA) 4.35 10 MAX14777 toc01 SEL35 = HIGH ILOAD = 60mA ON-RESISTANCE (Ω) ON-RESISTANCE (Ω) 4.40 ON-RESISTANCE vs. VB_ MAX14777 toc02 ON-RESISTANCE vs. VB_ SEL35 = HIGH VA_ = 35V 1 0.1 0.01 1 4.20 -15 -5 5 15 VB_ (V) www.maximintegrated.com 25 35 0 -15 -5 5 15 VB_ (V) 25 35 0.001 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (ºC) Maxim Integrated │ 8 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 0.2 0 25 35 MAX14777 toc07 -40 -60 -80 -100 VEN_ = VL -120 -40 -25 -10 5 20 35 50 65 80 95 110 125 0.1 TEMPERATURE (ºC) -30 -40 -50 -60 -70 -80 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 -90 -4.5 -100 -5.0 0.1 1 10 FREQUENCY (MHz) www.maximintegrated.com 100 100 MAX14777 toc09 -20 10 FREQUENCY RESPONSE 0 FREQUENCY RESPONSE (dB) MAX14777 toc08 -10 1 FREQUENCY (MHz) OFF-ISOLATION vs. FREQUENCY 0 OFF-ISOLATION (dB) 15 -20 CROSSTALK (dB) SUPPLY CURRENT (mA) 0.8 0.4 5 CROSSTALK vs. FREQUENCY 0 MAX14777 toc06 SEL35 = HIGH 1.0 -5 ANALOG SIGNAL VOLTAGE (V) SUPPLY CURRENT vs. TEMPERATURE 1.2 MAX14777 toc05 SEL35 = HIGH VA_ = 35V CHARGE INJECTION (pC) 10 MAX14777 toc04 ON-LEAKAGE CURRENT (nA) 100 OFF-LEAKAGE CURRENT vs. TEMPERATURE RS = RL = 50Ω 0.1 1 10 100 FREQUENCY (MHz) Maxim Integrated │ 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.) 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. ANALOG SIGNAL VOLTAGE 15 34 32 30 28 26 24 5 0 1 FREQUENCY (MHz) SEL35 = LOW 10 0.1 FREQUENCY (kHz) 25 20 -120 20 MAX14777 toc13 0.001 22 RL = 10kΩ -15 -5 5 15 25 ANALOG SIGNAL VOLTAGE (V) www.maximintegrated.com 35 20 -15 -5 5 15 25 35 ANALOG SIGNAL VOLTAGE (V) Maxim Integrated │ 10 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. Connect to GND. 6 A1 Analog Switch 1 Terminal A. Switch 1 is open when EN1 is low. 7 A2 Analog Switch 2 Terminal A. Switch 2 is open when EN2 is low. 8 A3 Analog Switch 3 Terminal A. Switch 3 is open when EN3 is low. 9 A4 Analog Switch 4 Terminal A. Switch 4 is open when EN4 is low. 10 SEL35 11 EN1 www.maximintegrated.com FUNCTION Positive Charge-Pump Output. Bypass VP to GND with a 10nF, 50V capacitor for applications with an input range of ±15V (SEL35 = low) or a 100V capacitor for applications with an input range of -15V/+35V (SEL 35 = high). Place the capacitor as close as possible to the device. Ground Negative Charge-Pump Output. Bypass VN to GND with a 50V, 10nF ceramic capacitor placed as close as possible to the device. Analog-Signal Range Select Input. Drive SEL35 low to enable the -15V/+15V analog signal range. Drive SEL35 high to enable the -15V/+35V analog signal range. Switch 1 Control Input. Drive EN1 high to close switch 1. Drive EN1 low to open switch 1. Maxim Integrated │ 11 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.C. No Connection. Not internally connected. 17 B4 Analog Switch 4 Terminal B. Switch 4 is open when EN4 is low. 18 B3 Analog Switch 3 Terminal B. Switch 3 is open when EN3 is low. 19 B2 Analog Switch 2 Terminal B. Switch 2 is open when EN2 is low. 20 B1 Analog Switch 1 Terminal B. Switch 1 is open when EN1 is low. — EP Exposed Pad. Connect EP to VN. Do not connect to ground. EP is not intended as an electrical connection point. Detailed 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 up to -15V/+35V analog signal range for all switches when pin SEL35 is high. When pin SEL35 is low, the analog signal range reduces to -15V/+15V signal range, also resulting in a lower VCC supply current. SEL35 trades off high-side analog signal range for supply current. Each switch has a separate control input to allow independent switching. The MAX14777 features 10Ω (max) on-resistance, and 9mΩ (typ) RON flatness, along with a 50nA (max at +85°C) on-leakage. For maximum signal integrity, the IC keeps this performance over the entire common-mode voltage range. Each switch can carry up to 60mA (max) of continuous current in either direction. Integrated Bias Generation The MAX14777 contains a total of three charge pumps to generate bias voltages for the internal switches: a 5V regulated charge pump, a positive high-voltage charge pump (VP), and a negative high-voltage charge pump (VN). When VCC is above 4.75V (typ), the 5V charge pump is bypassed and VCC provides the input for the high-voltage charge pumps, reducing overall supply current. www.maximintegrated.com The voltage at VN is always -16V (typ); however, the MAX14777 features a pin-selectable (SEL35) voltagehigh range for the analog signal. When the SEL35 input is low, the voltage on VP is +26V (typ) and the analog signal range is -15V/+15V. When the SEL35 input is high, the voltage on VP is +46V (typ) and the analog signal range is extended to -15V/+35V. An external 10nF capacitor is required for each highvoltage charge pump between VP/VN and GND. Use a 50V-rated capacitor on VN. On VP use a 50V capacitor if SEL35 = low or use a 100V capacitor if SEL35 = high. Never use VP or VN to power external circuitry. Analog Signal Levels The MAX14777 transmits signals above and below the rails with a single 3.0V to 5.5V supply due to its integrated bias circuitry. The analog signal range is pin selectable using the SEL35 input. Drive SEL35 low to switch signals between -15V and +15V. Drive SEL35 high to switch signals between -15V and +35V. Setting SEL35 low reduces both turn-on delay and VCC supply current. The MAX14777 features 10Ω (max) on-resistance and 9mΩ (typ) RON flatness for analog signals between -15V and +35V. The current flow through the switches can be bidirectional. Maxim Integrated │ 12 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. VCC = 0V), both the transient and DC signal conditions should be considered. Every A_ and B_ pin has internal diodes to VP and VN, as shown in Figure 8. Applying a positive voltage on A_ or B_ charges the VP capacitor through the diode to VP. Applying a negative voltage on A_ or B_ charges the VN capacitor negative through the diode to VN. Switch terminals A_, B_ are tolerant to high-voltage signals ranging from -15V to +35V when device is unpowered; i.e, VCC = 0 or VCC floating. CONFIG Under DC conditions, when a voltage is applied to an A_ or B_ pin, with VCC unpowered, the switch is open when the voltage difference between the A_and B_ pin is larger than 3V. Under these conditions, DC leakage current flows into the pin. When |VA - VB| < 3V DC, the switch is not fully open, and currents up to a few mA can flow between A_ and B_. If SEL35 is connected low, the VP capacitor charges to about 25V. Applying a positive voltage above about 25V on A_ or B_ charges the VP capacitor through the diode to VP. Once the VP capacitor is charged to this increased voltage, current flow from A_ or B_ ceases. Thus, even when SEL35 is low, any of A_ or B_ tolerate voltages up to 35V. VCC VL SEL35 Once the capacitor is charged to a DC voltage, the IL_IO_OFF current flows. Thus, under transient conditions, applying a changing voltage to an A_ or B_ pin results in flow into or out of the pin due to a charge movement at the external capacitors on VP and VN. MAX14777 VP BIAS GENERATION VP 10nF 50V/100V VN 10nF 50V/100V VP A1 B1 A2 B2 A3 B3 A4 B4 VN EN1 EN2 EN3 EN4 VN Figure 8. Typical Application Circuit www.maximintegrated.com Maxim Integrated │ 13 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. By using three of the four MAX14777 switches, which provide accurate current and voltage measurement, the device handles voltages up to 36V, as maximally found in current-loop power supplies. In voltage measurement mode, with switch positions as shown in Figure 9, analog input voltages in the ±15V range are switched to the amplifier input. Invert all switch positions for current loop measurement operation. When the analog input module is not powered, the MAX14777 tolerates and protects the resistor and PGA against voltages mistakenly connected to the AIN terminal. L+ 24V 1/4 MAX14777 AIN PGA 250Ω COM Figure 9. Analog Input Module for Voltage and Current Loop Measurement www.maximintegrated.com Maxim Integrated │ 14 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. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. www.maximintegrated.com PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 20 TQFN-EP T2044+4 21-0139 90-0409 Maxim Integrated │ 15 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. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2013 Maxim Integrated Products, Inc. │ 16