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DAC1232LCN データシート(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 DAC1232LCN
部品情報  12-Bit, uP Compatible, Double-Buffered D to A Converters
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

DAC1232LCN データシート(HTML) 6 Page - National Semiconductor (TI)

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10 DIGITAL INTERFACE
These DACs are designed to provide all of the necessary
digital input circuitry to permit a direct interface to a wide
variety of microprocessor systems The timing and logic lev-
el convention of the input control signals allow the DACs to
be treated as a typical memory device or IO peripheral with
no external logic required in most systems Essentially
these DACs can be mapped as a two-byte stack in memory
(or IO space) to receive their 12 bits of input data in two
successive 8-bit data writing sequences The DAC1230 se-
ries is intended for use in systems with an 8-bit data bus
The DAC1208 series provides all 12 digital input lines which
can be externally configured to be controlled from an 8-bit
bus or can be driven directly from a 16-bit data bus
All of the digital inputs to these DACs contain a unique
threshold regulator circuit to maintain TTL voltage level
compatibility independent of the applied VCC to the DAC
Any input can also be driven from higher voltage CMOS
logic levels in non-microprocessor based systems To pre-
vent damage to the chip from static discharge all unused
digital inputs should be tied to VCC or ground As a trouble-
shooting aid if any digital input is inadvertently left floating
the DAC will interpret the pin as a logic ‘‘1’’
Double buffered digital inputs allow the DAC to internally
format the 12-bit word used to set the current switching R-
2R ladder network (see section 20) from two 8-bit data
write cycles
Figures 1 and 2 show the internal data regis-
ters and their controlling logic circuitry The timing diagrams
for updating the DAC output are shown in sections 11 12
and 13 for three possible control modes The method used
depends strictly upon the particular application
FIGURE 1 DAC1208 DAC1209 DAC1210 Functional Diagram
TLH5690 – 6
FIGURE 2 DAC1230 DAC1231 DAC1232 Functional Diagram
6


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