Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- THERMAL INFORMATION
- ELECTRICAL CHARACTERISTICS
- PIN CONFIGURATIONS
- TIMING REQUIREMENTS
- TABLES OF GRAPHS
- TYPICAL CHARACTERISTICS: Internal Reference
- TYPICAL CHARACTERISTICS: DAC at AVDD = 5.5 V
- TYPICAL CHARACTERISTICS: DAC at AVDD = 3.6 V
- TYPICAL CHARACTERISTICS: DAC at AVDD = 2.7 V
- THEORY OF OPERATION
- APPLICATION INFORMATION
- Revision History
V /V
REFIN REFOUT
R
1
Q
2
Q
1
R
2
Reference
Enable
DAC8562, DAC8563
DAC8162, DAC8163
DAC7562, DAC7563
SLAS719D –AUGUST 2010–REVISED AUGUST 2012
www.ti.com
INTERNAL REFERENCE
The DAC756x, DAC816x, and DAC856x include a 2.5-V internal reference that is disabled by default. The
internal reference is externally available at the V
REFIN
/V
REFOUT
pin. The internal reference output voltage is 2.5 V
and can sink and source up to 20 mA.
A minimum 150-nF capacitor is recommended between the reference output and GND for noise filtering.
The internal reference of the DAC756x, DAC816x, and DAC856x is a bipolar transistor based precision bandgap
voltage reference. Figure 90 shows the basic bandgap topology. Transistors Q
1
and Q
2
are biased such that the
current density of Q
1
is greater than that of Q
2
. The difference of the two base-emitter voltages (V
BE1
– V
BE2
) has
a positive temperature coefficient and is forced across resistor R
1
. This voltage is amplified and added to the
base-emitter voltage of Q
2
, which has a negative temperature coefficient. The resulting output voltage is virtually
independent of temperature. The short-circuit current is limited by design to approximately 100 mA.
Figure 90. Bandgap Reference Simplified Schematic
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