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MAX5721AUA+
10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface
General DescriptionThe MAX5721 dual 10-bit, low-power, buffered voltage-
output, digital-to-analog converter (DAC) is packaged
in a space-saving 8-pin µMAX®package (5mm ✕
3mm). The wide supply voltage range of +2.7V to
+5.5V and 112µA supply current accommodate low-
power and low-voltage applications. DAC outputs
employ on-chip precision output amplifiers that swing
rail-to-rail. The MAX5721’s reference input accepts a
voltage range from 0 to VDD. In power-down the refer-
ence input is high impedance, further reducing the sys-
tem’s total power consumption.
The 20MHz, 3-wire SPI™, QSPI™, MICROWIRE™ and
DSP-compatible serial interface saves board space
and reduces the complexity of opto- and transformer-
isolated applications. The MAX5721 on-chip power-on
reset (POR) circuit resets the DAC outputs to zero and
loads the output with a 100kΩresistor to ground. This
provides additional safety for applications that drive
valves or other transducers that need to be off on
power-up. The MAX5721’s software-controlled power-
down reduces supply current to less than 0.3µA and
provides software-selectable output loads (1kΩ, 100kΩ,
or high impedance) while in power-down. The
MAX5721 is specified over the -40°C to +125°C auto-
motive temperature range
ApplicationsAutomatic Tuning
Gain and Offset Adjustment
Power Amplifier Control
Process Control I/O Boards
Battery-Powered Instruments
VCO Control
FeaturesUltra-Low Power Consumption
112µA at VDD= +3.6V
135µA at VDD= +5.5VWide +2.7V to +5.5V Single-Supply RangeTiny 8-Pin µMAX Package 0.3µA Power-Down Current Guaranteed 10-Bit Monotonicity (±1LSB DNL)Safe Power-Up Reset to Zero Volts at DAC OutputThree Software Selectable Power-Down
Impedances (100kΩ, 1kΩ, Hi-Z)Fast 20MHz, 3-Wire SPI, QSPI, and MICROWIRE-
Compatible Serial InterfaceRail-to-Rail Output Buffer AmplifiersSchmitt-Triggered Logic Inputs for Direct
Interface to OptocouplersWide -40°C to +125°C Operating Temperature
Range
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial InterfaceREF
DINSCLK
OUTB
OUTAGND
VDD
μMAX
TOP VIEW
MAX5721
Pin Configuration19-2125; Rev 3; 4/05
µMAX is a registered trademark of Maxim Integrated Products, Inc.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Corp.
Ordering Information
PARTTEMP RANGEPIN-PACKAGEMAX5721EUA-40°C to +85°C8 µMAX
MAX5721AUA-40°C to +125°C8 µMAX
Functional Diagram appears at end of data sheet.
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +2.7V to +5.5V, GND = 0, VREF= VDD, RL= 5kΩ, CL= 200pF, TA= TMINto TMAX, unless otherwise noted. Typical values are
VDD= +5V, TA= +25°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.
VDDto GND..............................................................-0.3V to +6V
OUT_, SCLK, DIN, CS, REF to GND...............-0.3 to (VDD+0.3V)
Maximum Continuous Current Into Any Pin......................±50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.6 mW/°C above +70°C)............362mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature.....................................................+150°C
Storage Temperature Range............................-65°C to +150°C
Lead Temperature (soldering, 10s)................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
STATIC ACCURACY (Note 1)ResolutionN10Bits
Intergral Nonlinearity ErrorINL(Note 2)±0.5±4LSB
Differential Nonlinearity ErrorDNLGuaranteed monotonic (Note 2)±1LSB
Zero-Code ErrorOECode = 0000.41.5% of FS
Zero-Code Error Tempco2.3ppm/°C
Gain ErrorGECode = 3FF hex±3% of FS
Gain-Error Tempco0.26ppm/°C
Power-Supply Rejection RatioPSRRCode = 3FF hex, ∆VDD = ±10%58.8dB
REFERENCE INPUTReference Input Voltage RangeVREF0VDDV
In operation6490126kΩReference Input ImpedanceRREFIn power-down mode2MΩ
Reference-Down Reference
CurrentIn power-down mode (Note 3)110µA
DAC OUTPUTOutput Voltage RangeNo load (Note 4)0VDDV
DC Output ImpedanceCode = 200 hex0.8Ω
VDD = +3V15Short-Circuit CurrentVDD = +5V48mA
VDD = +3V8Wake-Up TimeVDD = +5V8µs
Output Leakage CurrentPower-down mode = output high
impedance±18nA
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
ELECTRICAL CHARACTERISTICS (continued)(VDD= +2.7V to +5.5V, GND = 0, VREF= VDD, RL= 5kΩ, CL= 200pF, TA= TMINto TMAX, unless otherwise noted. Typical values are
VDD= +5V, TA= +25°C.)
TIMING CHARACTERISTICS (VDD= 2.7V to 5.5V, GND = 0, TA= TMINto TMAX, unless otherwise noted.)
Note 1:DC specifications are tested without output loads.
Note 2:Linearity guaranteed from code 29 to code 995.
Note 3:Limited with test conditions.
Note 4:Offset and gain error limit the FSR.
Note 5:Guaranteed by design.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DIGITAL INPUTS (SCLK, DIN, CS)Input High VoltageVIHVDD = +3V, +5V0.7 x
VDDV
Input Low VoltageVILVDD = +3V, +5V0.3 x
VDDV
Input Leakage CurrentIINDigital inputs = 0 or VDD±0.1±1µA
Input Capacitance5pF
DYNAMIC PERFORMANCEVoltage-Output Slew RateSR0.5V/µs
Voltage-Output Settling Time100 hex to 300 hex (Note 5)410µs
Digital FeedthroughAll digital inputs from 0 to VDD0.1nV-s
Digital-Analog Glitch InpulseMajor carry transition (code 1FF hex to
code 200 hex)12nV-s
DAC-to-DAC CrosstalknV-s
POWER REQUIREMENTSSupply Voltage RangeVDD2.75.5V
All digital inputs at 0 or VDD = 3.6V112205Supply Current with No LoadIDDAll digital inputs at 0 or VDD = 5.5V135215µA
Power-Down Supply CurrentIDDPDAll digital inputs at 0 or VDD = 5.5V0.291µA
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSCLK Clock FrequencyfSCLK020MHz
SCLK Pulse Width HightCH25ns
SCLK Pulse Width LowtCL25ns
CS Fall to SCLK Rise Setup TimetCSS10ns
SCLK Fall to CS Rise Setup TimetCSH10ns
DIN to SCLK Fall Setup TimetDS15ns
DIN to SCLK Fall Hold TimetDH0ns
CS Pulse Width HightCSW80ns
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface1024
MAX5721 toc01
CODE
INL (LSB)
INTEGRAL NONLINEARITY
vs. CODE, TA = +25°CVDD = +5V
VDD = +3V
MAX5721 toc02
CODE
DNL (LSB)
DIFFERENTIAL NONLINEARITY
vs. CODE, TA = +25°CMAX5721 toc03
CODE
TOTAL UNADJUSTED ERROR (%)
TOTAL UNADJUSTED ERROR
vs. CODE (TA = +25°C)VDD = +5V
VDD = +3V1024
MAX5721 toc04
CODE
INL (LSB)
INTEGRAL NONLINEARITY
vs. CODE, TA = -40°CVDD = +3V
VDD = +5V1024
MAX5721 toc07
CODE
INL (LSB)
INTEGRAL NONLINEARITY
vs. CODE, TA = +125°CVDD = +5V
VDD = +3V
MAX5721 toc05
CODE
DNL (LSB)
DIFFERENTIAL NONLINEARITY
vs. CODE, TA = -40°C2563841285126407688961024
MAX5721 toc06
CODE
TOTAL UNADJUSTED ERROR (%)
TOTAL UNADJUSTED ERROR
vs. CODE (TA = -40°C)VDD = +3V
VDD = +5V
MAX5721 toc08
CODE
DNL (LSB)
DIFFERENTIAL NONLINEARITY
vs. CODE, TA = +125°CMAX5721 toc09
CODE
TOTAL UNADJUSTED ERROR (%)
TOTAL UNADJUSTED ERROR
vs. CODE (TA = +125°C)VDD = +5V
VDD = +3V
__________________________________________Typical Operating Characteristics(VREF= VDD, TA= +25°C, unless otherwise noted.)
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial InterfaceMAX5721 toc10
TEMPERATURE (°C)
INL AND DNL (LSB)
WORST-CASE INL AND DNL
vs. TEMPERATUREMAXIMUM INL
MINIMUM INL
MAXIMUM DNL
MINIMUM DNL
SOURCE-AND-SINK CURRENT CAPABILITY
(VDD = +3V)
MAX5721 toc11
ISOURCE/SINK (mA)
OUT
(V)
CODE = 3FF
HEX, SOURCING
CURRENT
FROM OUT_
CODE = 300
HEX, SOURCING
CURRENT
FROM OUT_
CODE = 100 HEX,
SINKING CURRENT
INTO OUT_
CODE = 000
SINKING CURRENT INTO OUT_26810121416
SOURCE-AND-SINK CURRENT CAPABILITY
(VDD = +5V)MAX5721 toc12
ISOURCE/SINK (mA)
OUT
(V)
CODE = 3FF HEX, SOURCING
CURRENT FROM OUT_
CODE = 300 HEX,
SOURCING CURRENT
FROM OUT_
CODE = 000
SINKING CURRENT INTO OUT_
CODE = 100 HEX,
SINKING CURRENT
INTO OUT_
MAX5721 toc13
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SUPPLY CURRENT
vs. SUPPLY VOLTAGECODE = 3FF HEX
FULL-SCALE SETTLING TIME (VDD = +5V)MAX5721 toc17
VOUT_
1V/div
1μs/div
CODE 000 TO 3FF HEX
RL = 5kΩ
CL = 200pF
VSCLK
5V/div
MAX5721 toc14
SUPPLY VOLTAGE (V)
POWER-DOWN SUPPLY CURRENT (nA)
POWER-DOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGESUPPLY CURRENT vs. CS INPUT VOLTAGE
MAX5721 toc15
SUPPLY CURRENT (
VDD = +3V
VDD = +5V
CS INPUT VOLTAGE (V)
Typical Operating Characteristics (continued)(VREF= VDD, TA= +25°C, unless otherwise noted.)
MAX5721 toc16
TEMPERATURE (°C)
SUPPLY CURRENT (
SUPPLY CURRENT
vs. TEMPERATUREVDD = +3.6V
VDD = +5.5V
FULL-SCALE SETTLING TIME (VDD = +5V)MAX5721 toc18
VOUT_
1V/div
1μs/div
VSCLK
5V/div
CODE 3FF HEX TO 000
RL = 5kΩ
CL = 200pF
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
HALF-SCALE SETTLING TIME (VDD = +3V)MAX5721 toc19
VOUT_
1V/div
1μs/div
VSCLK
5V/div
CODE 100 HEX TO 300 HEX
RL = 5kΩ
CL = 200pF
HALF-SCALE SETTLING TIME (VDD = +3V)MAX5721 toc20
VOUT_
1V/div
1μs/div
VSCLK
5V/div
CODE 300 HEX TO 100 HEX
RL = 5kΩ
CL = 200pF
Typical Operating Characteristics (continued)(VREF= VDD, TA= +25°C, unless otherwise noted.)
EXITING POWER-DOWN (VDD = +5V)MAX5721 toc21
VOUT_
1V/div
5μs/div
VSCLK
5V/div
CODE 200 HEX
DIGITAL-TO-ANALOG GLITCH IMPULSE
(VDD = +5V)MAX5721 toc22
VOUT_
AC-COUPLED,
20mV/div
1μs/div
CODE 1FF HEX
TO 200 HEX
SCLK,
fSCLK = 500kHz
2V/div
DIGITAL-TO-ANALOG GLITCH IMPULSE
(VDD = +3V)MAX5721 toc23
VOUT_
AC-COUPLED,
50mV/div
1μs/div
SCLK,
fSCLK = 500kHz,
2V/div
CODE 1FF HEX
TO 200 HEX
DIGITAL-TO-ANALOG GLITCH IMPULSE
(VDD = +5V)MAX5721 toc24
VOUT_
AC-COUPLED,
50mV/div
1μs/div
CODE 200 HEX
TO 1FF HEX
SCLK,
fSCLK = 500kHz,
2V/div
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
DIGITAL-TO-ANALOG GLITCH IMPULSE
(VDD = +3V)MAX5721 toc25
VOUT_
AC-COUPLED,
20mV/div
1μs/div
SCLK,
fSCLK = 500kHz,
1V/div
CODE 200 HEX
TO 1FF HEX
POWER-ON RESET, FAST RISE TIME
(VDD = +5V)MAX5721 toc26
VOUT_
AC-COUPLED,
10mV/div
20μs/div
VDD RISE
TIME = 20μs
VDD
2V/div
Typical Operating Characteristics (continued)( VREF= VDD, TA= +25°C, unless otherwise noted.)
POWER-ON RESET, SLOW RISE TIME
(VDD = +5V)MAX5721 toc27
VOUT_
AC-COUPLED,
2mV/div
40μs/div
VDD
2V/divVDD RISE
TIME = 76μs
MAX5721 toc28
VOUT_
AC-COUPLED,
10mV/div
20μs/div
POWER-ON RESET, FAST RISE TIME
(VDD = +3V)VDD
2V/div
VDD RISE
TIME = 20μs
MAX5721 toc29
VOUT_
AC-COUPLED,
2mV/div
40μs/div
VDD RISE
TIME = 72μs
VDD
2V/div
POWER-ON RESET, SLOW RISE TIME
(VDD = +3V)100ns/div
MAX5721 toc30
fSCLK = 1MHz
SCLK,
2V/div
VOUT_,
AC-COUPLED
1mV/div
CLOCK FEEDTHROUGH (VDD = +5V)
