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參數(shù)資料
| 型號： | DAC8544I |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | QUAD, 16-BIT, RAIL-TO-RAIL VOLTAGE OUTPUT, PARALLEL INTERFACE, DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 四，16位，軌到軌電壓輸出，并行接口，數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大小： | 476K |
| 代理商： | DAC8544I |
www.ti.com
POWER-ON RESET
The DAC8544 contains a power-on reset circuit that controls the output voltage after power up. On power up, the
DAC register (and DAC output) is set to zero (plus a small offset error produced by the output buffer). It remains
at zero until a valid write sequence is made to the DAC, changing the DAC register data. This is useful in
applications where it is important to know the state of the output of the DAC after power up. All digital inputs
must be logic low until the digital and analog supplies are applied. Logic high voltages, applied to the input pins
when power is not applied to IOV
DD
and V
DD
, may power the device through the ESD input structures causing
undesired operation.
POWER-DOWN MODES
The DAC8544 uses two modes of operation. These modes are programmable via pin PD.
VOLTAGE REFERENCE INPUTS
Two voltage inputs provide the reference set points for the DAC architecture. These are V
REF+
and V
REF–
. For
typical rail-to-rail operation, V
REF+
should be equivalent to V
DD
and V
REF–
tied to GND. The output voltage is given
by:
V
OUT
2
V
REF
V
REF
V
REF
D
65536
(2)
ANALOG AND DIGITAL SUPPLIES
The analog supply (V
DD
) powers the output buffer and DAC while the digital supply (IOV
DD
) powers the digital
interface. V
DD
can operate from 2.7 V to 5.5 V while IOV
DD
can independently function from 1.8 V to 5.5 V. IOV
DD
determines the interface logic level. See the device specification table for details.
EXTERNAL REFERENCE VOLTAGE
To take advantage of the absolute accuracy of DAC8544, a high-performance reference voltage generator must
be used. DAC8544 has a typical absolute accuracy error of 2 millivolts, and a typical voltage drift of 3 ppm/
°
C.
This level of performance requires an accurate external reference voltage generator with good temperature drift
characteristics. Accuracy, drift, supply voltage, power consumption, and cost are important factors in choosing a
voltage reference. TI's REF02 is recommended. TI's REF3140 and REF3040 are small and low-cost
alternatives.
DAC8544
SLAS420–MAY 2004
Table 2 shows how the state of the pin correspond to the mode of operation of the DAC8544.
Table 2. Modes of Operation for the DAC8544
PD
High
Low
OPERATING MODE
Normal operation
Power down, high impedance
When pin PD is high, the device works normally with its typical power consumption of 950 μA at V
DD
= 5 V.
However, when PD pin is in low state, the device is in power-down mode, the supply current falls to 200 nA at
V
DD
= 5 V (50 nA at V
DD
= 3 V), and the output is open circuit (high impedance).
All analog circuitry is shut down when a power-down mode is activated. However, the contents of the DAC
register are unaffected when in power-down mode. This allows the DAC output voltage to return to the previous
level when power up resumes. The delay time required to exit power-down is typically 2.5 μs for V
DD
= 5 V, and 5
μs for V
DD
= 3 V. (See the typical characteristics section for additional information.)
The use of the V
REF–
input allows minor adjustments to be made to the offset of the DAC output by applying a
small voltage to the V
REF–
input. A low output impedance source is needed, so that the accuracy of the DAC over
its operating range is not affected.
15
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