Manufacturer Part NumberDAC124S085
ManufacturerTexas Instruments
DAC124S085 datasheet

Specifications of DAC124S085

Resolution(bits)12Dac: Channels4
InterfaceSerial SPIOutput TypeVoltage
Output Range Max.(v Or Ma)5.5Settling Time(µs)8.5
Reference: TypeExtPower Consumption(typ)(mw)1.1
Pin/package10QFN, 10SON, 10VSSOP, 10WSON  
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DAC124S085 12-Bit Micro Power QUAD Digital-to-Analog Converter with
Rail-to-Rail Output
Literature Number: SNAS348D

DAC124S085 Summary of contents

  • Page 1

    ... DAC124S085 DAC124S085 12-Bit Micro Power QUAD Digital-to-Analog Converter with Rail-to-Rail Output Literature Number: SNAS348D ...

  • Page 2

    ... The DAC124S085 is a full-featured, general purpose QUAD 12-bit voltage-output digital-to-analog converter (DAC) that can operate from a single +2.7V to 5.5V supply and consumes 1 and 2 5V. The DAC124S085 is pack- aged in 10-lead LLP and MSOP packages. The 10-lead LLP package makes the DAC124S085 the smallest QUAD DAC in its class ...

  • Page 3

    ... Ordering Information Order Numbers DAC124S085CISD DAC124S085CISDX DAC124S085CIMM DAC124S085CIMMX DAC124S085EVAL Block Diagram www.national.com Temperature Range ≤ ≤ −40°C T +105°C A ≤ ≤ LLP Tape-and-Reel −40°C T +105°C A ≤ ≤ −40°C T +105°C A ≤ ≤ MSOP Tape-and-Reel −40°C T +105°C ...

  • Page 4

    Pin Descriptions LLP MSOP Symbol Pin No OUTA V 3 OUTB V 4 OUTC 5 V OUTD 6 GND 7 V REFIN SYNC 10 SCLK PAD 11 (LLP only) Type Supply ...

  • Page 5

    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 ...

  • Page 6

    Symbol Parameter I Output Short Circuit Current (sink) OS Continuous Output I O Current (Note 10) C Maximum Load Capacitance Output Impedance OUT REFERENCE INPUT CHARACTERISTICS Input Range Minimum Input Range Maximum VREFIN Input Impedance LOGIC INPUT ...

  • Page 7

    A.C. and Timing Characteristics Values shown in this table are design targets and are subject to change before product release. The following specifications apply for 4047. Boldface limits apply for T Symbol Parameter f SCLK Frequency SCLK ...

  • Page 8

    ... REFIN where V is the supply voltage for this product, and "n" is REF the DAC resolution in bits, which is 12 for the DAC124S085. MAXIMUM LOAD CAPACITANCE is the maximum capaci- tance that can be driven by the DAC with output stability maintained. MONOTONICITY is the condition of being monotonic, where the DAC has an output that never decreases when the input code increases ...

  • Page 9

    Transfer Characteristic Timing Diagrams www.national.com FIGURE 1. Input / Output Transfer Characteristic FIGURE 2. Serial Timing Diagram 8 20173205 20173206 ...

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    Typical Performance Characteristics 4047, unless otherwise stated INL 3.0V A DNL 3.0V A INL/DNL REFIN REF A SCLK 20173252 20173254 = 3.0V A 20173256 9 ...

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    INL/DNL SCLK INL/DNL vs Clock Duty Cycle at V INL/DNL vs Temperature at V www.national.com = 2.7V A 20173250 = 3.0V INL/DNL vs Clock Duty Cycle 20173224 = 3.0V INL/DNL vs Temperature at ...

  • Page 12

    Zero Code Error vs 20173230 Zero Code Error vs. f SCLK 20173234 Zero Code Error vs. Temperature 20173236 Zero Code Error vs. V Zero Code Error vs. Clock Duty Cycle Full-Scale Error vs REFIN 20173231 20173235 ...

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    Full-Scale Error vs. V Full-Scale Error vs. Clock Duty Cycle Supply Current vs. V www.national.com REFIN 20173232 Full-Scale Error vs. Temperature 20173238 Supply Current vs. Temperature A 20173244 12 Full-Scale Error vs. f SCLK 20173233 20173239 20173245 ...

  • Page 14

    Glitch Response 20173246 Power-On Reset 13 20173247 www.national.com ...

  • Page 15

    ... Functional Description 1.1 DAC SECTION The DAC124S085 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 voltage is ex- ternally applied at V and is shared by all four DACs. REFIN For simplicity, a single resistor string is shown in Figure 3. ...

  • Page 16

    ... The DAC124S085 has four power-down modes, two of which are identical. In power-down mode, the supply current drops to 20 µ and 30 µA at 5V. The DAC124S085 is set in power-down mode by setting OP1 and OP0 to 11. Since this mode powers down all four DACs, the address bits, A1 and A0, are used to select different output terminations for the DAC outputs ...

  • Page 17

    ... LM4050 Available with accuracy of 0.44%, the LM4050 shunt refer- ence is also a good choice as a reference for the DAC124S085 available in 4.096V and 5V versions and comes in a space-saving 3-pin SOT23. FIGURE 6. The LM4050 as a power supply The minimum resistor value in the circuit of Figure 6 must be chosen such that the maximum current through the LM4050 does not exceed its 15 mA rating ...

  • Page 18

    ... ESR values that may be too high at low tem- peratures. 2.2 BIPOLAR OPERATION The DAC124S085 is designed for single supply operation and thus has a unipolar output. However, a bipolar output may be obtained with the circuit in Figure 9. This circuit will provide an output voltage range of ±5 Volts. A rail-to-rail amplifier should be used if the amplifier supplies are limited to ± ...

  • Page 19

    ... PC7 should be raised to end the write sequence. FIGURE 12. 68HC11 Interface 2.3.4 Microwire Interface Figure 13 shows an interface between a Microwire compatible device and the DAC124S085. Data is clocked out on the rising edges of the SK signal result, the SK of the Microwire device needs to be inverted before driving the SCLK of the DAC124S085. ...

  • Page 20

    ... Physical Dimensions inches (millimeters) unless otherwise noted 10-Lead MSOP Order Numbers DAC124S085CIMM NS Package Number MUB10A 10-Lead LLP Order Numbers DAC124S085CISD NS Package Number SDA10A 19 www.national.com ...

  • Page 21

    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 ...

  • Page 22

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...