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参数资料
| 型号： | DAC5311IDCKTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 12 us SETTLING TIME, 8-BIT DAC, PDSO6 |
| 封装： | GREEN, PLASTIC, SC-70, 6 PIN |
| 文件页数： | 24/42页 |
| 文件大小： | 2283K |
| 代理商： | DAC5311IDCKTG4 |
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APPLICATION INFORMATION
USING THE REF5050 AS A POWER SUPPLY
BIPOLAR OPERATION USING THE DACx311
V
O +
AV
DD
D
2n
R
1 ) R2
R
1
* AVDD
R
2
R
1
V
O +
10
D
2n
*5V
(2)
REF5050
DACx311
+5V
110 A
m
V
OUT
=0Vto5V
SYNC
SCLK
D
IN
+5.5V
Three-Wire
Serial
Interface
1 F
m
DACx311
AV
DD
V
OUT
R
10kW
2
+5V
±5V
+5.5V
OPA211
10 F
m
0.1 F
m
Three-Wire
Serial
Interface
- 5.5V
R
10kW
1
SBAS442 – AUGUST 2008 ................................................................................................................................................................................................ www.ti.com
FOR THE DACx311
The DACx311 has been designed for single-supply
As a result of the extremely low supply current
operation but a bipolar output range is also possible
required by the DACx311, an alternative option is to
using the circuit in Figure 115. The circuit shown
use a REF5050 +5V precision voltage reference to
gives an output voltage range of ±5V. Rail-to-rail
supply the required voltage to the part, as shown in
operation at the amplifier output is achievable using
Figure 114. This option is especially useful if the
power supply is too noisy or if the system supply
amplifier. For a full list of available operational
voltages are at some value other than 5V. The
amplifiers from TI, see the TI web site at www.ti.com
REF5050 outputs a steady supply voltage for the
The output voltage for any input code can be
DACx311. If the REF5050 is used, the current
calculated as follows:
needed to supply DACx311 is typically 110
A at 5V,
with no load on the output of the DAC. When the
DAC output is loaded, the REF5050 also needs to
supply the current to the load. The total current
required (with a 5k
load on the DAC output) is:
(1)
110
A + (5V/5k) = 1.11mA
Where:
The load regulation of the REF5050 is typically
n = resolution in bits; either 8 (DAC5311), 10
0.002%/mA, which results in an error of 90
V for the
(DAC6311), or 12 (DAC7311).
1.1mA current drawn from it. This value corresponds
D = decimal equivalent of the binary code that is
to a 0.07LSB error at 12 bits (DAC7311).
loaded to the DAC register. It ranges from 0 to
255 for 8-bit DAC5311; from 0 to 1023 for the
10-bit DAC6311; and 0 to 4095 for the 12-bit
DAC7311.
With AVDD = 5V, R1 = R2 = 10k:
This is an output voltage range of ±5V with 000h
(12-bit level) corresponding to a –5V output and FFFh
(12-bit level) corresponding to a +5V output.
Figure 114. REF5050 as Power Supply to
DACx311
For
other
power-supply
voltages,
alternative
(3.3V), or REF3220 (2.048V) are recommended. For
a full list of available voltage references from TI, see
the TI web site at www.ti.com.
Figure 115. Bipolar Operation with the DACx311
30
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): DAC5311 DAC6311 DAC7311
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