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DAC7811

FEATURES DESCRIPTION

APPLICATIONS

12-Bit

R-2RDAC

Power-On

Reset

DAC7811

SYNC

SCLK

SDIN

REF

I 1

OUT

I 2

OUT

SDO

GND

InputLatch

ControlLogicand

InputShiftRegister

DACRegister

DAC7811

SBAS337C – APRIL 2005 – REVISED JULY 2007

12-Bit, Serial Input, Multiplying

Digital-to-Analog Converter

• 2.7V to 5.5V Supply Operation

The DAC7811 is a CMOS, 12-bit, current output

digital-to-analog converter (DAC). This device

• 50MHz Serial Interface

operates from a 2.7V to 5.5V power supply, making it

• 10MHz Multiplying Bandwidth

suitable for battery-powered and many other

• ± 15V Reference Input

applications.

• Low Glitch Energy: 5nV-s

This DAC uses a double-buffered 3-wire serial

• Extended Temperature Range:

interface that is compatible with SPI™, QSPI™,

–40 ° C to +125 ° C

MICROWIRE™, and most DSP interface standards.

In addition, a serial data out pin (SDO) allows for

• 10-Lead MSOP Package

daisy-chaining when multiple devices are used. Data

• 12-Bit Monotonic

readback allows the user to read the contents of the

• 4-Quadrant Multiplication

DAC register via the SDO pin. On power-up, the

internal shift register and latches are filled with

• Power-On Reset with Brownout Detection

zeroes and the DAC outputs are at zero scale.

• Daisy-Chain Mode

The DAC7811 offers excellent 4-quadrant

• Readback Function

multiplication characteristics, with large signal

• Industry-Standard Pin Configuration

multiplying bandwidth of 10MHz. The applied

external reference input voltage (V

REF

) determines

the full-scale output current. An integrated feedback

• Portable Battery-Powered Instruments

resistor (R

) provides temperature tracking and

full-scale voltage output when combined with an

• Waveform Generators

external current-to-voltage precision amplifier.

• Analog Processing

• Programmable Amplifiers and Attenuators

The DAC7811 is available in a 10-lead MSOP

package.

• Digitally Controlled Calibration

• Programmable Filters and Oscillators

• Composite Video

• Ultrasound

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.

SPI, QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor.

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 (24 pages)

PAGE 1
DA C 781 1 DAC7811 SBAS337C – APRIL 2005 – REVISED JULY 2007 12-Bit, Serial Input, Multiplying Digital-to-Analog Converter FEATURES • • • • • • • • • • • • • 2.7V to 5.
PAGE 2
DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 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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DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 ELECTRICAL CHARACTERISTICS (continued) VDD = +2.7 V to +5.5 V; IOUT1 = Virtual GND; IOUT2 = 0V; VREF = +10 V; TA = full operating temperature. All specifications –40°C to +125°C, unless otherwise noted. DAC7811 PARAMETER CONDITIONS MIN TYP MAX UNITS REFERENCE INPUT VREF range –15 15 V 8 10 12 kΩ 8 10 12 kΩ VIL VDD = +2.7V 0.6 V VIL VDD = +5V 0.
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DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 PIN DESCRIPTION MSOP PACKAGE (TOP VIEW) IOUT1 1 10 IOUT2 2 9 GND 3 8 VDD SCLK 4 5 7 6 SDO SDIN RFB VREF SYNC TERMINAL FUNCTIONS TERMINAL NAME 1 IOUT1 DAC Current Output 2 IOUT2 DAC Analog Ground. This pin is normally tied to the analog ground of the system. 3 GND Ground pin. 4 SCLK Serial Clock Input. By default, data is clocked into the input shift register on the falling edge of the serial clock input.
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DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 TYPICAL CHARACTERISTICS: VDD = +5V At TA = +25°C, unless otherwise noted. LINEARITY ERROR vs DIGITAL INPUT CODE DIFFERENTIAL LINEARITY ERROR vs DIGITAL INPUT CODE 1.0 1.0 0.8 TA = +25°C 0.8 TA = +25°C 0.6 VREF = +10V 0.6 VREF = +10V 0.4 DNL (LSB) INL (LSB) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.6 -0.8 -0.8 -1.
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DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 TYPICAL CHARACTERISTICS: VDD = +5V (continued) At TA = +25°C, unless otherwise noted. SUPPLY CURRENT vs LOGIC INPUT VOLTAGE REFERENCE MULTIPLYING BANDWIDTH 0.9 VDD = +5.0V Attenuation (dB) 0.7 0xFFF 0x800 0x400 0x200 0x100 0x080 0x040 0x020 0x010 0x008 0x004 0x002 0x001 0.6 0.5 0.4 0.3 0.2 VDD = +3.0V 0.1 0 0 1.0 2.0 3.0 4.0 0x000 10 5.0 100 10k 1k 100k 1M 10M Logic Input Voltage (V) Figure 8.
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DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 TYPICAL CHARACTERISTICS: VDD = +5V (continued) At TA = +25°C, unless otherwise noted. SUPPLY CURRENT vs TEMPERATURE 2.0 1.6 VREF = +10V 1.8 VREF = +10V 1.4 1.6 Output Leakage (nA) Quiescent Current (mA) OUTPUT LEAKAGE vs TEMPERATURE 1.4 1.2 1.0 VDD = +5.0V 0.8 0.6 VDD = +3.0V 0.4 1.2 1.0 0.8 0.6 0.4 0.2 0.2 0 0 -40 -20 0 20 40 60 80 100 120 -40 -20 0 20 40 60 Temperature (°C) Temperature (°C) Figure 13.
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DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 TYPICAL CHARACTERISTICS: VDD = +2.7V At TA = +25°C, unless otherwise noted. LINEARITY ERROR vs DIGITAL INPUT CODE DIFFERENTIAL LINEARITY ERROR vs DIGITAL INPUT CODE 1.0 1.0 0.8 TA = +25°C 0.8 TA = +25°C 0.6 RREF = +10V 0.6 VREF = +10V 0.4 DNL (LSB) INL (LSB) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.6 -0.8 -0.8 -1.
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DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 TYPICAL CHARACTERISTICS: VDD = +2.7V (continued) At TA = +25°C, unless otherwise noted. MIDSCALE DAC GLITCH Output Voltage (50mV/div) Output Voltage (50mV/div) MIDSCALE DAC GLITCH Code 2048 to 2047 Code 2047 to 2048 DAC Update DAC Update 0 Time (50ns/div) Time (50ns/div) Figure 21. Figure 22. GAIN ERROR vs TEMPERATURE OUTPUT LEAKAGE vs TEMPERATURE 1.6 VREF = +10V -0.2 Output Leakage (nA) -0.4 Gain Error (mV) VREF = +10V 1.
PAGE 10
DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 Theory of Operation The DAC7811 is a single channel, current output, 12-bit digital-to-analog converter (DAC). The architecture, illustrated in Figure 25, is an R-2R ladder configuration with the three MSBs segmented. Each 2R leg of the ladder is either switched to IOUT1 or the IOUT2 terminal. The IOUT1 terminal of the DAC is held at a virtual GND potential by the use of an external I/V converter op amp.
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DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 Theory of Operation (continued) Table 1. Control Logic Truth Table (1) CLK SYNC X H No effect Latched ↓– L Shift register data advanced one bit Latched In daisy-chain mode, the function as determined by C3-C0 is executed. In daisy-chain mode, the contents may change as determined by C3-C0. ↑+ X (1) SERIAL SHIFT REGISTER DAC REGISTER ↓– Negative logic transition, default CLK mode;↑+ Positive logic transition; X = Do not care.
PAGE 12
DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 SYNC Interrupt (Stand-Alone Mode) In a normal write sequence, the SYNC line is kept low for at least 16 falling edges of SCLK and the DAC is updated on the 16th falling edge. However, if SYNC is brought high before the 16th falling edge, this acts as an interrupt to the write sequence. The shift register is reset and the write sequence is seen as invalid. Neither an update of the DAC register contents nor a change in the operating mode occurs.
PAGE 13
DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 Control Bits C3 to C0 Control Bits C3 to C0 allow control of various functions of the DAC; see Table 2. Default settings of the DAC on powering up are as follows: Data clocked into shift register on falling clock edges; daisy-chain mode is enabled. The device powers on with zero-scale loaded into the DAC register and IOUT lines.
PAGE 14
DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 Amplifier Selection There are many choices and many differences in selecting the proper operational amplifier for a multiplying DAC (MDAC). Making the analog signal out of the MDAC is one critical aspect. However, there are also other issues to take into account such as amplifier noise, input bias current, and offset voltage, as well as MDAC resolution and glitch energy.
PAGE 15
DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 Table 4. Suitable High Speed Operational Amplifiers from Texas Instruments (Multiple Channel Options) SUPPLY VOLTAGE (V) GBW PRODUCT (MHz) VOLTAGE NOISE nV/√Hz GBW (typ) (MHz) SLEW RATE (V/μs) VOS (typ) (μV) VOS (max) (μV) CMRR (min) (dB) THS4281 ±2.7 to ±15 38 12.5 35 500 3500 500 1000 SOT5-23, MSOP-8, SOIC-8 Very Low-Power High Speed Rail-To-Rail Input/Output Voltage Feedback Operational Amplifier THS4031 ±4.5 to ±16.
PAGE 16
DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 Positive Voltage Output Circuit As Figure 30 illustrates, in order to generate a positive voltage output, a negative reference is input to the DAC7811. This design is suggested instead of using an inverting amp to invert the output as a result of resistor tolerance errors. For a negative reference, VOUT and GND of the reference are level-shifted to a virtual ground and a –2.5V input to the DAC7811 with an op amp. +2.
PAGE 17
DAC7811 www.ti.com SBAS337C – APRIL 2005 – REVISED JULY 2007 Programmable Current Source Circuit A DAC7811 can be integrated into the circuit in Figure 32 to implement an improved Howland current pump for precise voltage to current conversions. Bidirectional current flow and high voltage compliance are two features of the circuit.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant DAC7811IDGSR VSSOP DGS 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 DAC7811IDGST VSSOP DGS 10 250 330.0 12.4 5.3 3.4 1.4 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DAC7811IDGSR VSSOP DGS 10 2500 366.0 364.0 50.0 DAC7811IDGST VSSOP DGS 10 250 366.0 364.0 50.
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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.