TLC7226C_15 Datasheet, PDF (14/24 Pages) Texas Instruments – QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS

TLC7226C, TLC7226I, TLC7226M
ą
QUADRUPLE 8ĆBIT DIGITALĆTOĆANALOG CONVERTERS
ą
SLAS060F − JANUARY 1995 − REVISED APRIL 2009
APPLICATION INFORMATION
staircase window comparator (continued)
REF
OUTB
OUTA
Windows 1 and 2
OUTD
OUTC
Windows 2 and 3
Window 1
Window 2
Window 3
AGND
Figure 13. Overlapping Window Structure
output buffer amplifier
The unity-gain output amplifier is capable of sourcing 5 mA into a 2-kΩ load and can drive a 3300-pF capacitor.
The output can be shorted to AGND indefinitely or it can be shorted to any voltage between V_SS and V_DD
consistent with the maximum device power dissipation.
multiplying DAC
The TLC7226 can be used as a multiplying DAC when the reference signal is maintained between 2 V and
V_DD − 4 V. When this configuration is used, V_DD should be 14.25 V to 15.75 V. A low output-impedance buffer
should be used so that the input signal is not loaded by the resistor ladder. Figure 14 shows the general
schematic.
15 V
R1
AC Reference
Input Signal
R2
1/4 TLC7226
15 V
_
Vref
_
4
DAC
+
VO
+
OP07
AGND
DGND
5
6
Figure 14. AC Signal Input Scheme
14
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