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參數(shù)資料
| 型號： | TLC876MDW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 10-BIT 20 MSPS PARALLEL OUTPUT CMOS ANALOG-TO-DIGITAL CONVERTERS |
| 中文描述： | 10位20 MSPS的并行輸出CMOS模擬數(shù)字轉換器 |
| 文件頁數(shù)： | 15/23頁 |
| 文件大?。?/td> | 314K |
| 代理商： | TLC876MDW |
TLC876M TLC876I, TLC876C
10-BIT 20 MSPS PARALLEL OUTPUT CMOS
ANALOG-TO-DIGITAL CONVERTERS
SLAS140D – JULY 1997 – REVISED MAY 2000
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
driving the analog input (continued)
1
7
NC
5
6
4
2
3
0.1
μ
F
NC
VCC
RL = 4.99 k
AIN
TLC876
14.7 k
3 k
RIN = 4.99 k
2V(PP)
REFBF
0 V dc
–
+
A
Amplifier A can be an AD817 or AD818 with terminal numbers as shown. The AD817 and AD818
are wide bandwidth single supply op-amps.
Figure 16. Bipolar Level Shift
driving the reference terminals
dc considerations
The TLC876 requires an external reference on terminals REFTF and REFBF and a resistor array, nominally
500
, is connected between terminals REFTF and REFBF. A Kelvin connection, using the TLC876 reference
sense terminals REFTS and REFBS, minimizes voltage drops caused by external and internal wiring
resistance.
Figure 17 shows the equivalent input structure for the reference terminals. There is approximately 5
of
resistance between both REFTF and REFBF terminals and the reference ladder. If the force-sense connections
are not used, the voltage drop across the 5-
resistors results in a reduced voltage appearing across the ladder
resistance. This reduces the input span of the converter. Applying a slightly larger span between the REFTF
and REFBF terminals compensates for this error. Note that the temperature coefficients of the 5-
resistors are
1350 ppm. The effects of temperature should be considered when a force-sense reference configuration is not
used.
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