Manufacturer Part NumberDAC108S085CIMT/NOPB
DescriptionIC DAC 10BIT OCTAL R-R 16-TSSOP
ManufacturerNational Semiconductor
DAC108S085CIMT/NOPB datasheet

Specifications of DAC108S085CIMT/NOPB

Settling Time4.5µsNumber Of Bits10
Data InterfaceSerialNumber Of Converters8
Voltage Supply SourceSingle SupplyPower Dissipation (max)4.85mW
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / Case16-TSSOPFor Use WithDAC108S085EB - BOARD EVALUATION FOR DAC108S085
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther namesDAC108S085CIMT
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10-Bit Micro Power OCTAL Digital-to-Analog Converter
with Rail-to-Rail Outputs
General Description
The DAC108S085 is a full-featured, general purpose OCTAL
10-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 DAC108S085
is packaged in a 16-lead LLP package and a 16-lead TSSOP
package. The LLP package makes the DAC108S085 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 DAC108S085 also of-
fers daisy chain operation where an unlimited number of
DAC108S085s can be updated simultaneously using a single
serial interface.
There are two references for the DAC108S085. 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 DAC108S085 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 DAC108S085 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 DAC108S085 make it an
excellent choice for use in battery operated equipment.
The DAC108S085 is one of a family of pin compatible DACs,
including the 8-bit DAC088S085 and the 12-bit DAC128S085.
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
DAC108S085 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.
© 2007 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
, providing the
Settling Time
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
October 2007
±2 LSB (max)
+0.35 / −0.2 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
10 bits
6 µs (max)

DAC108S085CIMT/NOPB Summary of contents

  • Page 1

    ... Ordering Information Order Numbers DAC108S085CISQ DAC108S085CISQX DAC108S085CIMT DAC108S085CIMTX DAC108S085EB SPI ™ trademark of Motorola, Inc. © 2007 National Semiconductor Corporation Features ■ Guaranteed Monotonicity ■ Low Power Operation ■ Rail-to-Rail Voltage Output ■ Daisy Chain Capability ■ ...

  • Page 2

    Block Diagram www.national.com 2 30031203 ...

  • 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 1011. 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 1024 = V / 1024. 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 30031252 INL/DNL vs f 30031257 INL/DNL vs Temperature 30031222 ...

  • Page 10

    Zero Code Error vs. V Zero Code Error vs. f Full-Scale Error vs. V www.national.com A 30031230 Zero Code Error vs. Temperature SCLK 30031234 A 30031237 10 Zero Code Error vs. V REF 30031231 30031236 Full-Scale Error vs. V REF ...

  • Page 11

    Full-Scale Error vs. f SCLK 30031233 I vs 30031244 I vs. V VREF REF 30031225 Full-Scale Error vs. Temperature I vs. Temperature VA I vs. Temperature VREF 11 30031239 30031245 30031235 www.national.com ...

  • Page 12

    Settling Time Wake-Up Time Power-On Reset www.national.com Glitch Response 30031228 DAC-to-DAC Crosstalk 30031251 Multiplying Bandwidth 30031247 12 30031246 30031238 30031250 ...

  • Page 13

    Functional Description 1.1 DAC ARCHITECTURE The DAC108S085 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 ...

  • Page 14

    D is active. OUT 1.5 DAISY CHAIN OPERATION Daisy chain operation allows communication with any number of DAC108S085s using a single serial interface. As long as the correct number ...

  • Page 15

    When the DAC108S085 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 DAC108S085. The 4.096V version is useful 4.095V output range is desirable. Bypassing the LM4132 voltage input ...

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    ESR. Ceramic capacitors are attractive due to their small size but generally have ESR val- ues that are too low for use with the LP2980. Aluminum electrolytic capacitors are typically not a good choice ...

  • Page 19

    ADC Reference shows Channel A of the DAC108S085 providing the drive or supply voltage for a bridge sensor. By having the sensor sup- ply voltage adjustable, the output of the sensor can be opti- mized to the input level ...

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    Programmable Attenuator shows one of the channels of the DAC108S085 being used as a single-quadrant multiplier. In this configuration signal can be driven into one of the reference pins. The SPI interface of the DAC ...

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    LAYOUT, GROUNDING, AND BYPASSING For best accuracy and minimum noise, the printed circuit board containing the DAC108S085 should have separate analog and digital areas. The areas are defined by the loca- tions of the analog and digital power planes. ...

  • Page 22

    Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 16-Lead LLP Order Numbers DAC108S085CISQ NS Package Number SQA16A 16-Lead TSSOP Order Numbers DAC108S085CIMT NS Package Number MTC16 22 ...

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    Notes 23 www.national.com ...

  • Page 24

    ... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...