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DAC8812IBPW Scheda tecnica(PDF) 11 Page - Texas Instruments

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Il numero della parte DAC8812IBPW
Spiegazioni elettronici  Dual, Serial Input 16-Bit Multiplying Digital-to-Analog Converter
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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DAC8812IBPW Scheda tecnica(HTML) 11 Page - Texas Instruments

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THEORY OF OPERATION
CIRCUIT OPERATION
Digital-to-Analog Converters
R
R
R
2R
2R
2R
R
5 kW
S2
S1
DGND
V
X
REF
V
DD
R X
FB
I
X
OUT
A
X
GND
Digital interface connections omitted for clarity.
Switches S1 and S2 are closed, V
must be powered.
DD
V
OUT
+ *VREF
D
65536
(1)
DAC8812
SBAS349A – AUGUST 2005 – REVISED DECEMBER 2005
The DAC8812 contains two 16-bit, current-output, digital-to-analog converters (DACs). Each DAC has its own
independent multiplying reference input. The DAC8812 uses a 3-wire, SPI-compatible serial data interface, with a
configurable asynchronous RS pin for half-scale (MSB = 1) or zero-scale (MSB = 0) preset. In addition, an LDAC
strobe enables two channel simultaneous updates for hardware synchronized output voltage changes.
The DAC8812 contains two current-steering R-2R ladder DACs. Figure 30 shows a typical equivalent DAC. Each
DAC contains a matching feedback resistor for use with an external I-to-V converter amplifier. The RFBX pin is
connected to the output of the external amplifier. The IOUTX terminal is connected to the inverting input of the
external amplifier. The AGNDX pin should be Kelvin-connected to the load point in the circuit requiring the full
16-bit accuracy.
Figure 30. Typical Equivalent DAC Channel
The DAC is designed to operate with both negative or positive reference voltages. The VDD power pin is only
used by the logic to drive the DAC switches on and off. Note that a matching switch is used in series with the
internal 5 k
Ω feedback resistor. If users are attempting to measure the value of R
FB, power must be applied to
VDD in order to achieve continuity. The DAC output voltage is determined by VREF and the digital data (D)
according to Equation 1:
Note that the output polarity is opposite of the VREF polarity for dc reference voltages.
The DAC is also designed to accommodate ac reference input signals. The DAC8812 accommodates input
reference voltages in the range of –15 V to +15 V. The reference voltage inputs exhibit a constant nominal input
resistance of 5 k
Ω, ±20%. On the other hand, DAC outputs I
OUTA and B are code-dependent and produce
various output resistances and capacitances.
The choice of external amplifier should take into account the variation in impedance generated by the DAC8812
on the amplifiers' inverting input node. The feedback resistance, in parallel with the DAC ladder resistance,
dominates output voltage noise. For multiplying mode applications, an external feedback compensation capacitor
(CFB) may be needed to provide a critically damped output response for step changes in reference input
voltages.
11


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