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參數資料
| 型號： | 5962-87802012A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, 8 BITS INPUT LOADING, 7 us SETTLING TIME, 8-BIT DAC, CQCC20 |
| 封裝： | CERAMIC, LCC-20 |
| 文件頁數： | 19/21頁 |
| 文件大?。?/td> | 440K |
| 代理商： | 5962-87802012A |
TLC7226C, TLC7226I, TLC7226M
QUADRUPLE 8BIT DIGITALTOANALOG CONVERTERS
SLAS060F JANUARY 1995 REVISED APRIL 2009
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
AGND bias for direct bipolar output operation
The TLC7226 can be used in bipolar operation without adding more external operational amplifiers as shown
in Figure 4 by biasing AGND to VSS. This configuration provides an excellent method for providing a direct
bipolar output with no additional components. The transfer values are shown in Table 1.
_
+
DAC A
AGND
DGND
TLC7226
REF (Vref = 5 V)
OUT
4
18
2
6
3
VDD
5
VSS
5 V
Output range
(5 V to 5 V)
Digital inputs omitted for clarity.
Figure 4. AGND Bias for Direct Bipolar Operation
LSB
MSB
DAC LATCH CONTENTS
ANALOG OUTPUT
) V
ref
127
128
1111
) V
ref
1
128
1000
0001
1000
0000
–V
ref
128
+* V
ref
0111
1111
0000
0001
* V
ref
127
128
0000
0 V
Table 1. Bipolar (Offset Binary) Code
* V
ref
1
128
AGND bias for positive output offset
The TLC7226 AGND terminal can be biased above or below the system ground terminal, DGND, to provide an
offset analog output voltage level. Figure 5 shows a circuit configuration to achieve this for channel A of the
TLC7226. The output voltage, VO, at OUTA can be expressed as:
V
O +
V
BIAS )
D
A
V
I
where DA is a fractional representation of the digital input word (0 ≤ D ≤ 255/256).
(1)
Increasing AGND above system GND reduces the output range. VDD Vref must be at least 4 V to ensure
specified operation. Since the AGND terminal is common to all four DACs, this method biases up the output
voltages of all the DACs in the TLC7226. Supply voltages VDD and VSS for the TLC7226 should be referenced
to DGND.
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