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DAC8832

 

  

FEATURES DESCRIPTION

APPLICATIONS

RFB

INV

AGNDF

AGNDS

DGND

DAC

DAC Latch

Input

DAC8832

−

OPA277

OPA704

OPA727

SDI

SCLK

LDAC

OUT

INV

REF

−

REF

−

Serial

Interface

and

Control

Logic

DAC8832

SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007

16-Bit, Ultra-Low Power, Voltage-Output

Digital-to-Analog Converter

234

• 16-Bit Resolution

The DAC8832 is a single, 16-bit, serial-input,

voltage-output digital-to-analog converter (DAC)

• 2.7 V to 5.5 V Single-Supply Operation

operating from a single 3 V to 5 V power supply. The

• Very Low Power: 15 μ W for 3 V Power

DAC8832 provides excellent linearity (1 LSB INL),

• High Accuracy, INL: 1 LSB

low glitch, low noise, and fast settling (1.0 μ S to 1/2

• Low Noise: 18n V/ √ Hz LSB of full-scale output) over the specified

temperature range of – 40 ° C to +85 ° C. The output is

• Fast Settling: 1.0 μ S

unbuffered, which reduces the power consumption

• Fast SPI™ Interface, up to 50 MHz

and the error introduced by the buffer.

• Reset to Mid-Code

This device features a standard high-speed (clock up

• Schmitt-Trigger Inputs for Direct Optocoupler

to 50MHz), 3 V or 5 V SPI serial interface to

Interface

communicate with a DSP or microprocessor.

The DAC8832 provides unipolar or bipolar output

( ± V

REF

) when working with an external buffer, and is

• Portable Equipment

reset to mid-code after power-up. For optimum

• Automatic Test Equipment

performance, a set of Kelvin connections to the

external reference and the analog ground input are

• Industrial Process Control

provided.

• Data Acquisition Systems

• Optical Networking

The DAC8832 is available in a QFN-14 package, and

is pin-to-pin compatible with the DAC8831IRGY,

which is reset to zero code after power-up.

Functional Block Diagram

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2 SPI, QSPI are trademarks of Motorola, Inc.

3 Microwire is a trademark of National Semiconductor Corp.

4 All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (28 pages)

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DA ® C8 832 DAC8832 SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 16-Bit, Ultra-Low Power, Voltage-Output Digital-to-Analog Converter FEATURES DESCRIPTION 1 • • • • • • • • • 234 16-Bit Resolution 2.7 V to 5.5 V Single-Supply Operation Very Low Power: 15 μW for 3 V Power High Accuracy, INL: 1 LSB Low Noise: 18n V/√Hz Fast Settling: 1.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 ELECTRICAL CHARACTERISTICS All specifications at TA = TMIN to TMAX, VDD = +3 V or VDD = +5 V, VREF = +2.5 V unless otherwise noted. DAC8832 PARAMETER CONDITIONS MIN TYP MAX DAC8832ICRGY ±0.5 ±1 DAC8832IBRGY ±0.5 ±2 ±0.5 ±4 ±0.5 ±1 ±1 ±5 UNIT STATIC PERFORMANCE Resolution 16 Linearity error DAC8832IRGY Differential linearity error All grades TA = +25°C Gain error bits TA = –40°C to +85°C ±7 Gain drift ±0.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 ELECTRICAL CHARACTERISTICS (continued) All specifications at TA = TMIN to TMAX, VDD = +3 V or VDD = +5 V, VREF = +2.5 V unless otherwise noted. DAC8832 PARAMETER CONDITIONS MIN TYP MAX UNIT VDD V REFERENCE INPUT Reference input voltage range Reference input impedance (4) 1.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 PIN CONFIGURATION (NOT TO SCALE) VDD INV DGND LDAC SDI NC RGY PACKAGE QFN-14 (TOP VIEW) 13 12 11 10 9 14 8 SCLK DAC8832 Thermal Pad(1) 2 3 4 5 6 AGNDS VREF−S VREF−F 7 CS AGNDF 1 VOUT RFB NOTE: (1) Exposed thermal pad must be connected to analog ground. TERMINAL FUNCTIONS TERMINAL NO. DESCRIPTION NAME 1 RFB Feedback resistor. Connect to the output of external operational amplifier in bipolar mode.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 Case1: LDAC tied to LOW t td CS DAC Updated t Delay t sck t Lead t wsck t Lag t wsck t DSCLK SCLK t su t ho SDI BIT 15 (MSB) LDAC BIT 14 BIT 13, . . . ,1 BIT 0 LOW −−−Don’t Care Case2: LDAC Active t td CS t Delay t sck t Lead t wsck t Lag t wsck t DSCLK SCLK t su SDI t ho BIT 15 (MSB) BIT 14 BIT 13, . . . ,1 BIT 0 t DLADC HIGH LDAC t WLDAC DAC Updated −−−Don’t Care Figure 1.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 TIMING CHARACTERISTICS: VDD = +5 V (1) (2) At –40°C to +85°C, unless otherwise noted.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VDD = +5 V At TA = +25°C, VREF = +2.5 V unless otherwise noted. LINEARITY ERROR vs DIGITAL INPUT CODE DIFFERENTIAL LINEARITY ERROR vs DIGITAL INPUT CODE 1.00 1.00 TA = +25_C VREF = 2.5 V 0.50 0.50 0.25 0.25 0 −0.25 −0.25 −0.50 −0.75 −0.75 −1.00 0 8192 16384 24576 32768 40960 49152 57344 65536 Digital Input Code 0 Figure 3.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VDD = +5 V (continued) At TA = +25°C, VREF = +2.5 V unless otherwise noted. LINEARITY ERROR vs DIGITAL INPUT CODE DIFFERENTIAL LINEARITY ERROR vs DIGITAL INPUT CODE 1.00 1.00 TA = +25_C VREF = 5 V TA = +25_C VREF = 5 V 0.75 0.50 0.50 0.25 0.25 DNL (LSB) INL (LSB) 0.75 0 −0.25 0 −0.25 −0.50 −0.50 −0.75 −0.75 −1.00 −1.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VDD = +5 V (continued) At TA = +25°C, VREF = +2.5 V unless otherwise noted. REFERENCE CURRENT vs CODE (UNIPOLAR MODE) REFERENCE CURRENT vs CODE (BIPOLAR MODE) 300 300 VREF = 2.5 V VREF = 2.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VDD = +5 V (continued) At TA = +25°C, VREF = +2.5 V unless otherwise noted. MAJOR-CARRY GLITCH (FALLING) MAJOR-CARRY GLITCH (RISING) VREF = 2.5V 5V/div VREF = 2.5V 5V/div LDAC VOUT LDAC VOUT 0.1V/div 0.1V/div Time (0.5ms/div) Time (0.5ms/div) Figure 20. Figure 21. DAC SETTLING TIME (FALLING) DAC SETTLING TIME (RISING) VREF = 2.5V 5V/div VREF = 2.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VDD = +3 V At TA = +25°C, VREF = +2.5 V unless otherwise noted. LINEARITY ERROR vs DIGITAL INPUT CODE DIFFERENTIAL LINEARITY ERROR vs DIGITAL INPUT CODE 1.00 1.00 TA = +25_C VREF = 1.5 V 0.50 0.50 0.25 0.25 0 −0.25 −0.25 −0.50 −0.75 −0.75 −1.00 0 8192 16384 24576 32768 40960 49152 57344 65536 Digital Input Code 0 Figure 26.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VDD = +3 V (continued) At TA = +25°C, VREF = +2.5 V unless otherwise noted. LINEARITY ERROR vs DIGITAL INPUT CODE DIFFERENTIAL LINEARITY ERROR vs DIGITAL INPUT CODE 1.00 1.00 TA = +25_C VREF = 3 V TA = +25_C VREF = 3 V 0.75 0.50 0.50 0.25 0.25 DNL (LSB) INL (LSB) 0.75 0 −0.25 0 −0.25 −0.50 −0.50 −0.75 −0.75 −1.00 −1.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VDD = +3 V (continued) At TA = +25°C, VREF = +2.5 V unless otherwise noted. REFERENCE CURRENT vs CODE (BIPOLAR MODE) DIGITAL FEEDTHROUGH 300 VREF = 2.5 V VREF = 1.5 V Reference Current (µA) 250 5V/div SDI 200 150 20mV/div VOUT 100 50 0 0 Time (50ns/div) 8192 16384 24576 32768 40960 49152 57344 65536 Digital Input Code Figure 37. Figure 38.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 THEORY OF OPERATION GENERAL DESCRIPTION The DAC8832 is a single, 16-bit, serial-input, voltage-output DAC. It operates from a single supply ranging from 2.7 V to 5 V, and typically consumes 5 μA. Data are written to this device in a 16-bit word format, via an SPI serial interface. To ensure a known power-up state, the DAC8832 is designed with a power-on reset function. The DAC8832 is reset to mid-scale code.
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DAC8832 SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 www.ti.com POWER-ON RESET The DAC8832 has a power-on reset function to ensure the output is at a known state upon power-up. Upon power-up, the DAC latch and input register contain mid-scale code until new data are loaded from the input serial shift register. Therefore, after power-up, the output from pin VOUT is 0.5 × VREF in unipolar mode, and 0 V in bipolar mode.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 APPLICATION INFORMATION UNIPOLAR OUTPUT OPERATION The DAC8832 is capable of driving unbuffered loads of 60 kΩ. Unbuffered operation results in low supply current (typically 5 μA) and a low offset error. The DAC8832 can be configured to output both unipolar and bipolar voltages. Figure 44 shows a typical unipolar output voltage circuit. The code table for this mode of operation is shown in Table 1. +5 V +2.5 V 0.1 µF 0.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 BIPOLAR OUTPUT OPERATION With the aid of an external operational amplifier, the DAC8832 may be configured to provide a bipolar voltage output. A typical circuit of such an operation is shown in Figure 45. The matched bipolar offset resistors RFB and RINV are connected to an external operational amplifier to achieve this bipolar output swing; typically, RFB = RINV = 28 kΩ. +5 V +2.5 V 0.1 µF VDD 0.
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DAC8832 www.ti.com SBAS380B – FEBRUARY 2006 – REVISED SEPTEMBER 2007 OUTPUT AMPLIFIER SELECTION For bipolar mode, a precision amplifier should be used, supplied from a dual power supply. This provides the ±VREF output. In a single-supply application, selection of a suitable operational amplifier may be more difficult because the output swing of the amplifier does not usually include the negative rail; in this case, AGND.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 6-Jun-2013 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
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PACKAGE MATERIALS INFORMATION www.ti.com 5-Jun-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing DAC8832IBRGYR VQFN RGY 14 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3000 330.0 12.4 3.85 3.85 1.35 8.0 12.0 Q1 DAC8832IBRGYT VQFN RGY 14 250 180.0 12.4 3.85 3.85 1.35 8.0 12.0 Q1 DAC8832ICRGYR VQFN RGY 14 3000 330.0 12.4 3.85 3.85 1.35 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 5-Jun-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DAC8832IBRGYR VQFN RGY 14 3000 338.1 338.1 20.6 DAC8832IBRGYT VQFN RGY 14 250 210.0 185.0 35.0 DAC8832ICRGYR VQFN RGY 14 3000 338.1 338.1 20.6 DAC8832ICRGYT VQFN RGY 14 250 210.0 185.0 35.0 DAC8832IRGYR VQFN RGY 14 3000 338.1 338.1 20.6 DAC8832IRGYT VQFN RGY 14 250 210.0 185.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.