Manufacturer Part NumberDAC128S085CIMTX/NOPB
DescriptionIC DAC 12BIT 8CH RR OUT 16TSSOP
ManufacturerNational Semiconductor
DAC128S085CIMTX/NOPB datasheet

Specifications of DAC128S085CIMTX/NOPB

Settling Time6µsNumber Of Bits12
Data InterfaceSerialNumber Of Converters8
Voltage Supply SourceSingle SupplyPower Dissipation (max)4.85mW
Operating Temperature-40°C ~ 105°CMounting TypeSurface Mount
Package / Case16-TSSOPFor Use WithDAC128S085EB - BOARD EVALUATION FOR DAC128S085
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther namesDAC128S085CIMTX
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12-Bit Micro Power OCTAL Digital-to-Analog Converter
with Rail-to-Rail Outputs
General Description
The DAC128S085 is a full-featured, general purpose OCTAL
12-bit voltage-output digital-to-analog converter (DAC) that
can operate from a single +2.7V to +5.5V supply and con-
sumes 1.95 mW at 3V and 4.85 mW at 5V. The DAC128S085
is packaged in a 16-lead LLP package and a 16-lead TSSOP
package. The LLP package makes the DAC128S085 the
smallest OCTAL DAC in its class. The on-chip output ampli-
fiers allow rail-to-rail output swing and the three wire serial
interface operates at clock rates up to 40 MHz over the entire
supply voltage range. Competitive devices are limited to 25
MHz clock rates at supply voltages in the 2.7V to 3.6V range.
The serial interface is compatible with standard SPI ™ , QSPI,
MICROWIRE and DSP interfaces. The DAC128S085 also of-
fers daisy chain operation where an unlimited number of
DAC128S085s can be updated simultaneously using a single
serial interface.
There are two references for the DAC128S085. One refer-
ence input serves channels A through D while the other
reference serves channels E through H. Each reference can
be set independently between 0.5V and V
widest possible output dynamic range. The DAC128S085 has
a 16-bit input shift register that controls the mode of operation,
the power-down condition, and the DAC channels' register/
output value. All eight DAC outputs can be updated simulta-
neously or individually.
A power-on reset circuit ensures that the DAC outputs power
up to zero volts and remain there until there is a valid write to
the device. The power-down feature of the DAC128S085 al-
lows each DAC to be independently powered with three dif-
ferent termination options. With all the DAC channels
powered down, power consumption reduces to less than 0.3
µW at 3V and less than 1 µW at 5V. The low power consump-
tion and small packages of the DAC128S085 make it an
excellent choice for use in battery operated equipment.
The DAC128S085 is one of a family of pin compatible DACs,
including the 8-bit DAC088S085 and the 10-bit DAC108S085.
All three parts are offered with the same pinout, allowing sys-
tem designers to select a resolution appropriate for their
application without redesigning their printed circuit board. The
DAC128S085 operates over the extended industrial temper-
ature range of −40°C to +125°C.
Ordering Information
Order Numbers
SPI ™ is a trademark of Motorola, Inc.
© 2009 National Semiconductor Corporation
Guaranteed Monotonicity
Low Power Operation
Rail-to-Rail Voltage Output
Daisy Chain Capability
Power-on Reset to 0V
Simultaneous Output Updating
Individual Channel Power Down Capability
Wide power supply range (+2.7V to +5.5V)
Dual Reference Voltages with range of 0.5V to V
Operating Temperature Range of −40°C to +125°C
Industry's Smallest Package
Key Specifications
Settling Time
, providing the
Zero Code Error
Full-Scale Error
Supply Power
— Normal
— Power Down
Battery-Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage & Current Sources
Programmable Attenuators
Voltage Reference for ADCs
Sensor Supply Voltage
Range Detectors
Temperature Range
LLP Tape-and-Reel
TSSOP Tape-and-Reel
Evaluation Board - BOTH
March 10, 2009
±8 LSB (max)
+0.75 / −0.4 LSB (max)
+15 mV (max)
−0.75 %FSR (max)
1.95 mW (3V) / 4.85 mW (5V) typ
0.3 µW (3V) / 1 µW (5V) typ
Top Mark
16-Lead LLP
16-Lead TSSOP
12 bits
8.5 µs (max)

DAC128S085CIMTX/NOPB Summary of contents

  • Page 1

    ... DAC128S085 operates over the extended industrial temper- ature range of −40°C to +125°C. Ordering Information Order Numbers DAC128S085CISQ DAC128S085CISQX DAC128S085CIMT DAC128S085CIMTX DAC128S085EB SPI ™ trademark of Motorola, Inc. © 2009 National Semiconductor Corporation DAC128S085 Features ■ Guaranteed Monotonicity ■ Low Power Operation ■ Rail-to-Rail Voltage Output ■ ...

  • Page 2

    Block Diagram www.national.com 2 30016903 ...

  • Page 3

    Pin Configuration Pin Descriptions LLP TSSOP Symbol Pin No. Pin No OUTA OUTB OUTC OUTD REF1 REF2 8 ...

  • Page 4

    ... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Voltage on any Input Pin Input Current at Any Pin (Note 3) Package Input Current (Note 3) Power Consumption 25°C A ESD Susceptibility (Note 5) ...

  • Page 5

    Symbol Parameter Output Short Circuit Current (sink (Note 10) Continuous Output Current per I O channel (Note 9) C Maximum Load Capacitance Output Impedance OUT REFERENCE INPUT CHARACTERISTICS Input Range Minimum Input Range Maximum VREF1,2 ...

  • Page 6

    Symbol Parameter Total Power Consumption (output P N unloaded) Total Power Consumption in all PD P Modes, PD (Note 9) A.C. and Timing Characteristics The following specifications apply for 4047. Boldface limits apply for T Symbol Parameter ...

  • Page 7

    Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the ...

  • Page 8

    Specification Definitions DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1 LSB, which 4096 = V / 4096. REF A DAC-to-DAC CROSSTALK is the glitch impulse transferred to a ...

  • Page 9

    Typical Performance Characteristics unless otherwise stated INL vs Code INL/DNL vs V REF INL/DNL +2.7V to +5.5V REF1,2 30016952 INL/DNL vs f 30016957 INL/DNL vs Temperature 30016922 ...

  • Page 10

    Zero Code Error vs. V Zero Code Error vs. f Full-Scale Error vs. V www.national.com A 30016930 Zero Code Error vs. Temperature SCLK 30016934 A 30016937 10 Zero Code Error vs. V REF 30016931 30016936 Full-Scale Error vs. V REF ...

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    Full-Scale Error vs. f SCLK 30016933 I vs 30016944 I vs. V VREF REF 30016925 Full-Scale Error vs. Temperature I vs. Temperature VA I vs. Temperature VREF 11 30016939 30016945 30016935 www.national.com ...

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    Settling Time Wake-Up Time Power-On Reset www.national.com Glitch Response 30016928 DAC-to-DAC Crosstalk 30016951 Multiplying Bandwidth 30016947 12 30016946 30016938 30016950 ...

  • Page 13

    Functional Description 1.1 DAC ARCHITECTURE The DAC128S085 is fabricated on a CMOS process with an architecture that consists of switches and resistor strings that are followed by an output buffer. The reference voltages are externally applied at V for ...

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    D is active. OUT 1.5 DAISY CHAIN OPERATION Daisy chain operation allows communication with any number of DAC128S085s using a single serial interface. As long as the correct number ...

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    When the DAC128S085 first powers up, the DAC is in WRM. In WRM, the registers of each individual DAC channel can be written to without causing the DAC outputs to be updated. This is accomplished by setting DB15 to "0", ...

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    POWER-ON RESET The power-on reset circuit controls the output voltages of the eight DACs during power-up. Upon application of power, the DAC registers are filled with zeros and the output voltages are set to 0V. The outputs remain at ...

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    LM4132 The LM4132, with its ±0.05% accuracy over temperature good choice as a reference source for the DAC128S085. The 4.096V version is useful 4.095V output range is desirable. Bypassing the LM4132 voltage input ...

  • Page 18

    ... Industrial Application Figure 14 shows the DAC128S085 controlling several differ- ent circuits in an industrial setting. Channel A is shown pro- viding the reference voltage to the ADC121S625, one of National Semiconductor's general purpose Analog-to-Digital R1) A Converters (ADCs). The reference for the ADC121S625 may = 5V and be set to any voltage from 0 ...

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    ADC Reference Figure 15 shows Channel A of the DAC128S085 providing the drive or supply voltage for a bridge sensor. By having the sensor supply voltage adjustable, the output of the sensor can be optimized to the input level ...

  • Page 20

    Programmable Attenuator Figure 16 shows one of the channels of the DAC128S085 being used as a single-quadrant multiplier. In this configura- tion signal can be driven into one of the refer- ence pins. The SPI ...

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    LAYOUT, GROUNDING, AND BYPASSING For best accuracy and minimum noise, the printed circuit board containing the DAC128S085 should have separate analog and digital areas. The areas are defined by the loca- tions of the analog and digital power planes. ...

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    Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 16-Lead LLP Order Numbers DAC128S085CISQ NS Package Number SQA16A 16-Lead TSSOP Order Numbers DAC128S085CIMT NS Package Number MTC16 22 ...

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    Notes 23 www.national.com ...

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    ... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...