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AD7849*

Features: 14-Bit/16-Bit Multiplying DACGuaranteed MonotonicityOutput Control on Power-Up and Power-DownInternal or External ControlVersatile Serial InterfaceDAC Clears to 0 V in Both Unipolar and Bipolar Output RangesApplicationIndustrial Process ControlPC Analog I/O BoardsInstrumentationPinoutSpe...

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SeekIC No. : 004271027 Detail

AD7849*: Features: 14-Bit/16-Bit Multiplying DACGuaranteed MonotonicityOutput Control on Power-Up and Power-DownInternal or External ControlVersatile Serial InterfaceDAC Clears to 0 V in Both Unipolar and Bi...

AD7849* Data Sheet

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Part Number:
AD7849*
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
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Product Details

Description



Features:

14-Bit/16-Bit Multiplying DAC
Guaranteed Monotonicity
Output Control on Power-Up and Power-Down
Internal or External Control
Versatile Serial Interface
DAC Clears to 0 V in Both Unipolar and Bipolar Output Ranges


Application

Industrial Process Control
PC Analog I/O Boards
Instrumentation


Pinout

Connection Diagram


Specifications

(TA = +25°C unless otherwise noted)
VDD to DGND . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . .. . . . . . . 0.4 V to +17 V
VCC to DGND2 . . . . . . . . . . 0.4 V, VDD + 0.4 V or +7 V (Whichever Is Lower)
VSS to DGND . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . .. . . . . . 0.4 V to 17 V
VREF+ to DGND . . . . . . . . . . . . . .. . . . .. . . . .. . . . . . . VDD + 0.4 V, VSS 0.4 V
VREF to DGND . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . VDD + 0.4 V, VSS 0.4 V
VOUT to DGND3 . . .  . VDD + 0.4 V, VSS 0.4 V or ±10 V (Whichever Is Lower)
ROFS to DGND . . . . . . . . . . . . . . . .. . . . .. . . . .. . . . . . VDD + 0.4 V, VSS 0.4 V
Digital Input Voltage to DGND . . . . . . . . .. . . . .. . . . . .. . 0.4 V to VCC + 0.4 V
Input Current to any Pin Except Supplies4 . . . . . . . . . . . .. . . . . . . . . . ±10 mA
Operating Temperature Range
Commercial/Industrial (A, B, C Versions). . . .. . . . .. . . . . . .  40°C to +85°C
Extended (T Version) . . . . . . . . . . . . . . . .. . . . .. . . . .. . . .  55°C to +125°C
Storage Temperature Range . . . . . . . . . . .. . . . .. . . . ..  . . 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . .. . .  . +150°C
Plastic DIP Package, Power Dissipation . . . . . . . . . . . . . .. . . . .. . . . . . 875 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . .. . . . .. . . . .. . . . . . . 102°C/W
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . .. . . . .. . . . .. . . . +260°C
SOP Package, Power Dissipation . . . . . . . . . . . . . . . . .. . . . .. . . . . . . . 875 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . .. 74°C/W
Lead Temperature, Soldering
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . .. . . . .. . . . .. . . . .. . . +215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . .. . . . ..  . . +220°C
Cerdip Package, Power Dissipation . . . . . . . . . . . .. . . . .. . . . .. . . . . . 875 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . 71°C/W
Lead Temperature, Soldering (Soldering 10 secs) . . . . . . .. . . . .. . . . . 260°C


Description

The AD7849 is a 14-bit/16-bit serial input multiplying DAC. The DAC architecture ensures excellent differential linearity performance, and monotonicity is guaranteed to 14 bits for the A grade and to 16 bits for all other grades over the specified temperature ranges.

During power-up and power-down sequences (when the supply voltages are changing), the VOUT pin is clamped to 0 V via a low impedance path. To prevent the output of A3 being shorted to 0 V during this time, transmission gate G1 is also opened.

These conditions are maintained until the power supplies stabilize and a valid word is written to the DAC register. At this time, G2 opens and G1 closes. Both transmission gates are also externally controllable via the Reset In (RST IN) control input. For instance, if the RST IN input is driven from a battery supervisor chip, then on power-off or during a brown out, the RST IN input will be driven low to open G1 and close G2. The DAC must be reloaded, with RST IN high, to re-enable the output. Conversely, the on-chip voltage detector output (RST OUT) is also available to the user to control other parts of the system.

The AD7849 has a versatile serial interface structure and can be controlled over three lines to facilitate opto-isolator applications. SDOUT is the output of the on-chip shift register and can be used in a daisy-chain fashion to program devices in the multichannel system. The DCEN (Daisy Chain Enable) input controls this function.

The BIN/COMP pin sets the DAC coding; with BIN/COMP set to 0, the coding is straight binary; and with it set to 1, the coding is 2s complement. This allows the user to reset the DAC to 0 V in both the unipolar and bipolar output ranges. The part is available in a 20-lead DIP and 20-lead SOIC package.




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