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Industrial Analog Current/

Voltage-Output Conditioners

MAX15500/MAX15501

EVALUATION KIT AVAILABLE

General Description

The MAX15500/MAX15501 analog output conditioners

provide a programmable current up to Q24mA, or a volt-

age up to Q12V proportional to a control voltage signal.

The control voltage is typically supplied by an external

DAC with an output voltage range of 0 to 4.096V for the

MAX15500 and 0 to 2.5V for the MAX15501. The output

current and voltage are selectable as either unipolar or

bipolar. In the unipolar configuration, a control voltage

of 5% full-scale (FS) produces a nominal output of 0A or

0V to achieve underrange capability. A control voltage

of 100%FS produces one of two programmable levels

(105%FS or 120%FS) to achieve overrange capability.

The outputs of the MAX15500/MAX15501 are protected

against overcurrent conditions and a short to ground or

supply voltages up to Q35V. The devices also monitor for

overtemperature and supply brownout conditions. The

supply brownout threshold is programmable.

The MAX15500/MAX15501 are programmed through an

SPIK interface capable of daisy-chained operation. The

MAX15500/MAX15501 provide extensive error reporting

through the SPI interface and an additional open-drain

interrupt output. The devices include an analog output to

monitor load conditions.

The MAX15500/MAX15501 operate over the -40NC to

+105NC temperature range. The devices are available in

a 32-pin, 5mm x 5mm TQFN package.

Applications

Programmable Logic Controllers (PLCs)

Distributed I/Os

Embedded Systems

Industrial Control and Automation

Features

S Supply Voltage Up to Q32.5V

S Output Protected Up to Q35V

S Programmable Output (Plus Overrange)

±10V

0 to 10V

0 to 5V

±20mA

0 to 20mA

4 to 20mA

S Current Output Drives 0 to 1kI

S Voltage Output Drives Loads Down to 1kI

S HART Compliant

S 2ppm Gain Error Drift Over Temperature

S SPI Interface, with Daisy-Chain Capability

S Supports +4.096V (MAX15500) or +2.5V

(MAX15501) Full-Scale Input Signals

S Extensive Error Reporting

Short-Circuit and Overcurrent Protection

Open-Circuit Detection

Brownout Detection

Overtemperature Protection

S Fast, 40µs Settling Time

19-4602; Rev 1; 2/11

Ordering Information

Note: All devices are specified over the -40NC to +105NC oper-

ating temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

SPI is a trademark of Motorola, Inc.

SPI

INTERFACE

DIN

SCLK

CS1

DOUT

READY

ERROR

MON

REFIN

AIN

DVDD

AVSS

AVDD

FSMODE

FSSEL

AGND DGND

OUT

SENSERN

COMP

CS2

OUTDIS

AVSSO

AVDDO

ERROR

HANDLING

BIDIRECTIONAL

CURRENT

DRIVER

BIDIRECTIONAL

VOLTAGE

DRIVER

ERROR

HANDLING

OVER-

CURRENT

PROTECTION

SENSERP

SENSEVP

SENSEVN

MAX15500

MAX15501

Pin Configuration

MAX15500

MAX15501

TQFN

TOP VIEW

DIN

READY

ERROR

DVDD

DGND

SCLK

SENSEVN

SENSERP

AVDDO

N.C.

OUT

COMP

AVSS

4567

2324 22 20 19 18

MON

CS1

AIN

REFIN

AGND

FSMODE

DOUT

SENSERN

CS2

FSSEL

N.C.

OUTDIS

EP*

*EXPOSED PAD.

AGND

AVDD

N.C.

AVSSO

SENSEVP

Simplified Block Diagram

PART PIN-PACKAGE REFERENCE

MAX15500GTJ+ 32 TQFN-EP* +4.096V

MAX15501GTJ+ 32 TQFN-EP* +2.5V

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

Summary of content (28 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners General Description The MAX15500/MAX15501 analog output conditioners provide a programmable current up to Q24mA, or a voltage up to Q12V proportional to a control voltage signal. The control voltage is typically supplied by an external DAC with an output voltage range of 0 to 4.096V for the MAX15500 and 0 to 2.5V for the MAX15501. The output current and voltage are selectable as either unipolar or bipolar.
PAGE 2
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ABSOLUTE MAXIMUM RATINGS AVDD to AGND......................................................-0.3V to +35V AVSS to AGND.......................................................-35V to +0.3V AVDD to AVSS.............................................................. 0 to +70V AVDD to AVDDO............................................................ 0 to +4V AVSS to AVSSO.............................................................
PAGE 3
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CURRENT OUTPUT (Note 2) Maximum Load Resistance RLOAD VAVDD = +24V, VAVSS = -24V 750 VAVDD = +32.
PAGE 4
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN VAIN = 5% of VREFIN (unipolar mode), VAIN = 50% of VREFIN (bipolar mode) Offset Error Offset-Error Drift Gain Error GE 0.
PAGE 5
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.) PARAMETER SYMBOL Maximum Settling Time (1% Full-Scale Step) Gain Error CONDITIONS MIN 10 To 0.1% accuracy, load = 1kI in parallel with 1FF, CCOMP = 4.
PAGE 6
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.
PAGE 7
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.
PAGE 8
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.) 2.5 4 IAVDD 0 -2 -4 -6 -8 2.0 1.5 1.0 0.5 IAVSS -40 -25 -10 5 20 35 50 65 80 95 105 TEMPERATURE (NC) 20 35 50 65 80 95 105 TEMPERATURE (NC) VOLTAGE-MODE OUTPUT NOISE vs.
PAGE 9
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (continued) (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.) CURRENT-MODE PSRR vs. SUPPLY VOLTAGE LOAD TRANSIENT (VOLTAGE MODE) MAX15500 toc09 MAX15500 toc08 1.0 0.9 0.8 PSRR (FA/V) 0.7 0.6 IOUT 10mA/div OmA VOUT (AC-COUPLED) 20mV/div 0.5 0.4 0.3 0.2 0.
PAGE 10
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (continued) (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.) GAIN vs.
PAGE 11
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (continued) (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.) LARGE-SIGNAL SETTLING TIME (VOLTAGE MODE, RISING EDGE) CURRENT-MODE OUTPUT CONDUCTANCE vs. OUTPUT VOLTAGE 1.8 OUTPUT CONDUCTANCE (FA/V) MAX15500 toc24 MAX15500 toc23 2.0 1.
PAGE 12
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (continued) (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.
PAGE 13
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Pin Description PIN NAME 1 SCLK 2 DIN 3 DOUT SPI Data Output. Data transitions at DOUT on the falling edge of SCLK. DOUT is high impedance when either CS1 or CS2 is high. READY Active-Low Device Ready Output. READY is an active-low output that goes low when the device successfully completes processing an SPI data frame. READY returns high at the next rising edge of CS_.
PAGE 14
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Pin Description (continued) PIN FUNCTION OUT Analog Output. The analog voltage or current output range at OUT is programmable. See Tables 1 to 4 for possible output range settings. 20 AVDDO Positive Output Driver Supply Voltage Input. AVDDO provides power to the driver output stage. Bypass AVDDO to AVDD with a 0.1FF capacitor.
PAGE 15
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Circuit/Functional Diagram 24V 5V 0.1FF 0.1FF 0.1FF DVDD AVDDO 10kI AIN DAC AVDD SENSEVP CABLE1 SENSERP PGA 2.5V/4.
PAGE 16
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners _Detailed Description The MAX15500/MAX15501 output a programmable current up to Q24mA or a voltage up to Q12V proportional to a control signal at AIN. The devices operate from a dual 15V to 32.5V supply. The control voltage applied at AIN is typically supplied by an external DAC with an output voltage range of 0 to 4.096V for the MAX15500 and 0 to 2.5V for the MAX15501.
PAGE 17
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Output Monitor The MON output provides an analog voltage signal proportional to the output voltage in current mode and proportional to the output current in voltage mode. Use this signal to measure the system load presented to the output. The full-scale signal on MON is 3V with a typical accuracy of 10%. The signal range is typically 1.5V to 3V in unipolar mode and 0 to 3V in bipolar mode.
PAGE 18
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Output Open Load The open-circuit error bit activates when VOUT is within 30mV of AVDDO or AVSSO and there is no short-circuit current in current mode for longer than 260ms. This error activates the intermittent bit in the error register if the error goes away before the error register is read.
PAGE 19
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners TO OTHER CHIPS/CHAINS FC RPULLUP CSn CS1 CS SCLK DWRITE DREAD INT MONITOR MAX15500 MAX15501 CS2 CS1 SCLK DIN DOUT ERROR READY OPTIONAL CONNECTION Figure 4.
PAGE 20
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners TO OTHER CHIPS/CHAINS FC RPULLUP MAX15500 MAX15501 CSn CS1 CS SCLK DWRITE DREAD INT CS2 CS1 SCLK DIN DOUT ERROR READY MAX15500 MAX15501 CS2 CS1 SCLK DIN DOUT ERROR READY SPI DEVICE CS SCLK DIN DOUT Figure 6. Daisy-Chain Terminating (Compatible with Standard SPI) Modified SPI Interface Description The SCLK, DIN, and DOUT of the MAX15500/MAX15501 assume standard SPI functionality.
PAGE 21
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners The MAX15500/MAX15501 relinquish control of DOUT once the devices process the frame(s). DOUT remains high impedance when the SPI interface continues to hold CS_ low beyond the required frame(s). Install a pullup/ puldown resistor at the DOUT line to maintain the desired state when DOUT goes high impedance.
PAGE 22
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners TO OTHER CHIPS/CHAINS RPULLUP FC MAX15500 MAX15501 CSn CS1 CS SCLK DWRITE DREAD INT MONITOR CS2 CS1 SCLK DIN DOUT ERROR READY MAX15500 MAX15501 CS2 CS1 SCLK DIN DOUT ERROR READY MAX5134 CS SCLK DIN READY OPTIONAL CONNECTION Figure 7.
PAGE 23
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ACTIVE FRAME DIN X DIN13 DIN12 DIN11 DIN10 DIN9 tDS SCLK tCSH DOUT 1 2 3 4 DIN8 DIN7 DIN6 tCH 5 6 tCSS 7 8 DIN4 DIN3 DIN2 DIN1 DIN0 X X 9 10 11 12 13 14 15 16 tDOH tCL tCH Z DIN5 X tCP X 17 tDOZ tDOT HIGH-Z DOUT9 DOUT8 DOUT7 DOUT6 DOUT5 DOUT4 DOUT3 DOUT2 DOUT1 DOUT0 tCSV tDOE CS_ tCR tCSR READY Figure 9.
PAGE 24
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Table 5. SPI Commands COMMAND ADDRESS DIN[13:11] NAME DESCRIPTION 000 No-op No operation. 001 Write configuration Write device configuration register. See Table 6 for details. 010 Reserved Reserved, no operation. 011 Reserved Reserved, no operation. 100 Read error Read error register status. See Table 7 for details. 101 Read configuration Read device configuration register. See Table 6 for details.
PAGE 25
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Since the MAX15500/MAX15501 do not use a continuous clock signal, the SPI read cycles are used to cycle the error detection and reporting logic. Continue to poll the device until the error readback reports an all clear status when resolving single or multiple errors. See below for examples of typical error handling situations and the effects of the SPI read operations. 1) Error resolved by the system.
PAGE 26
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Table 8. Recommended Current Setting Components VREFIN (V) OVERRANGE (%) BIPOLAR/ UNIPOLAR MODE VSENSE_FS (V) RSENSE (I) IOUT (mA) IDEAL GAIN Unipolar 2 1.02144 42.2 24.205 0.2625/42.2 Bipolar 1 Q1.024 42.2 Q24.27 0.5/42.2 Unipolar 2 1.02144 48.7 20.97 0.2625/48.7 Bipolar 1 Q1.024 48.7 Q21.03 0.5/48.7 Unipolar 2 1.009375 41.2 24.5 0.425/41.2 Bipolar 1 Q1 41.2 Q24.27 0.8/41.2 Unipolar 2 1.
PAGE 27
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Table 10. Recommended Compensation Capacitor for Various Load Conditions MODE CL (F) RL (kI) LL (H) CCOMP (F) Voltage 0 to 1n 1 0 0 Voltage 1n to 100n 1 0 1n Voltage 100n to 1F 1 0 2.2n Voltage 1F to 100F 1 0 4.7n Current 0 to 1n 20 to 750 0 to 20F 0 Current 0 to 1n 20 to 750 20F to 1m 2.
PAGE 28
MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Revision History REVISION NUMBER REVISION DATE 0 7/09 Initial release — 1 2/11 Corrected description of DOUT pin in Pin Description section 13 DESCRIPTION PAGES CHANGED 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.