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参数资料
| 型号： | DAC8564ICPWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 12 us SETTLING TIME, 16-BIT DAC, PDSO16 |
| 封装： | GREEN, PLASTIC, TSSOP-16 |
| 文件页数： | 21/51页 |
| 文件大小： | 1549K |
| 代理商： | DAC8564ICPWR |
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V
REF
R
1
Q
2
N
Q
1
R
2
Reference
Disable
SBAS403D
– JUNE 2007 – REVISED MAY 2011
INTERNAL REFERENCE
The DAC8564 includes a 2.5V internal reference that
is enabled by default. The internal reference is
externally available at the VREFH/VREFOUT pin. A
minimum 100nF capacitor is recommended between
the reference output and GND for noise filtering.
The internal reference of the DAC8564 is a bipolar
transistor-based,
precision
bandgap
voltage
reference. Figure 94 shows the basic bandgap
topology. Transistors Q1 and Q2 are biased such that
the current density of Q1 is greater than that of Q2.
The difference of the two base-emitter voltages
(VBE1 – VBE2) has a positive temperature coefficient
and is forced across resistor R1. This voltage is
gained up and added to the base-emitter voltage of
Q2, which has a negative temperature coefficient. The
resulting output voltage is virtually independent of
Figure 94. Simplified Schematic of the Bandgap
temperature. The short-circuit current is limited by
Reference
design to approximately 100mA.
Enable/Disable Internal Reference
To then enable the internal reference, either perform
a power-cycle to reset the device, or write the 24-bit
The internal reference in the DAC8564 is enabled by
serial command shown in Table 2. These actions put
default and operates in automatic mode; however, the
the internal reference back into the default mode. In
reference can be disabled for debugging, evaluation
the default mode, the internal reference powers down
purposes, or when using an external reference. A
automatically when all DACs power down in any of
serial command that requires a 24-bit write sequence
the power-down modes (see the Power-Down Modes
(see the Serial Interface section) must be used to
section);
the
internal
reference
powers
up
disable the internal reference, as shown in Table 1.
automatically when any DAC is powered up.
During the time that the internal reference is disabled,
the
DAC
functions
normally
using
an
external
The DAC8564 also provides the option of keeping the
reference. At this point, the internal reference is
internal reference powered on all the time, regardless
disconnected from the VREFH/VREFOUT pin (3-state
of the DAC(s) state (powered up or down). To keep
output). Do not attempt to drive the VREFH/VREFOUT
the internal reference powered on, regardless of the
pin externally and internally at the same time
DAC(s) state, write the 24-bit serial command shown
indefinitely.
in Table 3.
Table 1. Write Sequence for Disabling Internal Reference
(internal reference always powered down
—012000h)
DB23
DB16
DB13
DB0
0
1
0
1
0
|
—————————————————– Data Bits ––—————————————————|
Table 2. Write Sequence for Enabling Internal Reference
(internal reference powered up to default mode
—010000h)
DB23
DB16
DB0
0
1
0
|
—————————————————– Data Bits ––—————————————————|
Table 3. Write Sequence for Enabling Internal Reference
(internal reference always powered up
—011000h)
DB23
DB16
DB12
DB0
0
1
0
1
0
|
—————————————————– Data Bits ––—————————————————|
28
Copyright
2007–2011, Texas Instruments Incorporated
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