DAC1007LCN National Semiconductor, DAC1007LCN Datasheet - Page 21

• Manufacturer Part Number: DAC1007LCN
• Description: IC DAC 10BIT MPU DBL BUFF 20-DIP
• Manufacturer: National Semiconductor
• Series: MICRO-DAC™r

Specifications of DAC1007LCN

• Settling Time: 500ns
• Number Of Bits: 9
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 500mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Interface: -
• Other names: *DAC1007LCN

DAC1006/1007/1008 — Simple Hookup for a “Quick Look”
7.4 Digitally Controlled Amplifier/Attenuator
An unusual application of the DAC, Figure 21 , applies the in-
put voltage via the on-chip feedback resistor. The lower op
amp automatically adjusts the V
I
of this V
in the DAC register. I
nitude of V
verts I
Note that N = 0 (or a digital code of all zeros) is not allowed or
this will cause the output amplifier to saturate at either
±
OUT1
V
MAX
is equal to the input current (V
OUT2
, depending on the sign of V
REF IN
IN
to a voltage, V
and the digital word. The second op amp con-
voltage depends on the digital word which is
OUT2
then depends upon both the mag-
OUT
, which is given by:
REF IN
FIGURE 21. Digitally Controlled Amplifier/Attenuator
IN
IN
.
/Rf
B
voltage such that
FIGURE 22. Digital to Synchro Converter
). The magnitude
21
To provide a digitally controlled divider, the output op amp
can be eliminated. Ground the I
V
the V
given by
OUT
REF
is now taken from the lower op amp (which also drives
input of the DAC). The expression for V
DS005688-56
(Continued)
OUT2
pin of the DAC and
DS005688-27
www.national.com
OUT
is now