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AD7249

Features: Two 12-Bit CMOS DAC Channels withOn-Chip Voltage ReferenceOutput AmplifiersThree Selectable Output Ranges per Channel5 V to +5 V, 0 V to +5 V, 0 V to +10 VSerial Interface125 kHz DAC Update RateSmall Size: 16-Lead DIP or SOICLow Power DissipationApplicationProcess ControlIndustrial Autom...

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SeekIC No. : 004269964 Detail

AD7249: Features: Two 12-Bit CMOS DAC Channels withOn-Chip Voltage ReferenceOutput AmplifiersThree Selectable Output Ranges per Channel5 V to +5 V, 0 V to +5 V, 0 V to +10 VSerial Interface125 kHz DAC Updat...

AD7249 Data Sheet

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Part Number:
AD7249
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

Two 12-Bit CMOS DAC Channels with
On-Chip Voltage Reference
Output Amplifiers
Three Selectable Output Ranges per Channel
5 V to +5 V, 0 V to +5 V, 0 V to +10 V
Serial Interface
125 kHz DAC Update Rate
Small Size: 16-Lead DIP or SOIC
Low Power Dissipation




Application

Process Control
Industrial Automation
Digital Signal Processing Systems
Input/Output Ports




Pinout

AD7249 Diagram

Connection Diagram




Specifications

Resolution (Bits) 12bit
DAC Update Rate 125kSPS
DAC Settling Time 7s
# DAC Outputs 2
DAC Type Voltage Out
DAC Input Format Ser
Output FSR (Bip 5V),(Uni 10V),(Uni 5V)
Ref Int/Ext Int/Ext
Supply Vnom Dual(+12, -12),Dual(+15, -15),Single(+12),Single(+15)
Pwr Diss 300mW
Package DIP,SOIC


VDD to AGND, DGND . . . . . . . . . . . . . . . . . 0.3 V to +17 V
VSS to AGND, DGND . . . . . . . . . . . . . . . . . +0.3 V to 17 V
AGND to DGND . . . . . . . . . . . . . . . . 0.3 V to VDD + 0.3 V
VOUTA, B2to AGND . . . . . . . . . . VSS 0.3 V to VDD + 0.3 V
REFOUT to AGND . . . . . . . . . . . . . . . . . . . . . . . . 0 V to VDD
REFIN to AGND . . . . . . . . . . . . . . . . . 0.3 V to VDD + 0.3 V
Digital Inputs to DGND . . . . . . . . . . . 0.3 V to VDD + 0.3 V
Operating Temperature Range
Industrial (A, B Versions) . . . . . . . . . . . . 40°C to +85°C
Extended (S Version) . . . . . . . . . . . . . . 55°C to +125°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . .+150°C
Storage Temperature Range . . . . . . . . . .65°C to +150°C
Power Dissipation Plastic DIP . . . . . . . . . . . . . . . . 600 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . .+117°C/W
Lead Temperature (Soldering, 10 secs) . . . . . . . .+300°C
Power Dissipation, Cerdip . . . . . . . . . . . . . . . . . . . 600 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . 76°C/W
Lead Temperature (Soldering, 10 secs) . . . . . . . .+300°C
Power Dissipation, SOIC . . . . . . . . . . . . . . . . . . . . .600 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . 75°C/W
Lead Temperature (Soldering)
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . .+215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . +220°C
NOTES
1.Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Only one Absolute Maximum Rating may be applied at any time.
2.The outputs may be shorted to voltages in this range provided the power dissipation of the package is not exceeded.




Description

The AD7249 DACPORT contains a pair of 12-bit, voltageoutput, digital-to-analog converters with output amplifiers and Zener voltage reference on a monolithic CMOS chip. No external trims are required to achieve full specified performance.

The output amplifiers are capable of developing +10 V across a 2 kΩ load. The output voltage ranges with single supply operation are 0 V to +5 V or 0 V to +10 V, while an additional bipolar ±5 V output range is available with dual supplies. The ranges are selected using the internal gain resistor.

Interfacing to the AD7249 is serial, minimizing pin count and allowing a small package size. Standard control signals allow interfacing to most DSP processors and microcontrollers. The data stream consists of 16 bits, DB15 to DB13 are don't care bits, the 13th bit (DB12) is used as the channel select bit and the remaining 12 bits (DB11 to DB0) contain the data to update the DAC. The 16-bit data word is clocked into the input register on each falling SCLK edge.

The data format is natural binary in both unipolar ranges, while either offset binary or twos complement format may be selected in the bipolar range. ACLR function is provided which sets the output to 0 V in both unipolar ranges and in the twos complement bipolar range, while with offset binary data format, the output is set to REFIN. This function is useful as a power-on reset as it allows the outputs to be set to a known voltage level.

The AD7249 features a serial interface which allows easy connection to both microcomputers and 16-bit digital signal processors with serial ports. The serial data may be applied at rates up to 2 MHz allowing a DAC update rate of 125 kHz.

The AD7249 is fabricated on linear compatible CMOS (LC2MOS), an advanced, mixed technology process. It is packaged in 16-lead DIP and 16-lead SOIC packages.






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