參數(shù)資料
型號(hào)： DAC7664YT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： DAC
英文描述： PARALLEL, WORD INPUT LOADING, 12 us SETTLING TIME, 16-BIT DAC, PQFP64
封裝： GREEN, PLASTIC, LQFP-64
文件頁(yè)數(shù)： 11/32頁(yè)
文件大小： 661K
代理商： DAC7664YT
DAC7664
SBAS271 MARCH 2004
www.ti.com
19
THEORY OF OPERATION
The DAC7664 is a quad voltage output 16-bit DAC. The
architecture is an R2R ladder configuration with the three
most significant bits (MSBs) segmented, followed by an
operational amplifier that serves as a buffer. Each DAC
has its own R2R ladder network, segmented MSBs, and
output op amp, as shown in Figure 53. The minimum
voltage output (zero-scale) and maximum voltage output
(full-scale) are set by the internal voltage references and
the resistors associated with the output operational
amplifier.
The digital input is a 16-bit parallel word and the DAC input
registers offer readback capability. The converters can be
powered from either a single +5V supply or a dual
±5V
supply. The device offers a reset function that immediately
sets all DAC output voltages and DAC registers to
mid-scale (code 8000h) or to zero-scale, code 0000h. See
Figure 54 and Figure 55 for the basic operation of the
DAC7664.
R
2R
V
REFH
V
REFL
V
OUT
V
OUTS2
V
OUTS1
OFSR2
OFSR1
13K
13K
12K
13K
11K
100
Figure 53. DAC7664 Architecture
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