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PC87591L Datasheet(PDF) 195 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87591L
Description  LPC Mobile Embedded Controllers
PDF  437 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87591L Datasheet(HTML) 195 Page - National Semiconductor (TI)

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Embedded Controller Modules (Continued)
Revision 1.07
195
www.national.com
Output Settling Time
The DAC output settling time depends on the external load characteristics and the required accuracy. Figure 68 shows the
equivalent circuit used for evaluating DAC behavior. Each DAC output has a typical output impedance of 3 K
Ω. For example,
if the total load is a 50 pF capacitor only, the output settles to 1/2 LSB within 1
µs. The total load capacitance is comprises
the analog output capacitance (CAO) and the external load capacitance (CL).
Filtering Noise on Output Signals
Output signals may have unwanted noise caused by nearby digital circuits. When using slow changing signals in a noisy
environment, a low-pass filter (LPF) may be added externally. This may also be required in applications where the DAC out-
puts control sensitive circuits like audio amplifiers. This can be implemented as a simple RC circuit. The cutoff frequency of
this LPF should be above the required signal frequency.
Figure 68. DAC Output Equivalent Circuit
CL
RO
CAO
RL
Application
DAC Output
Equivalent Circuit
Load Circuit
VOUT



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