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參數(shù)資料
| 型號(hào)： | TLC5540NS |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 8-BIT HIGH-SPEED ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 8位高速模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 234K |
| 代理商： | TLC5540NS |
TLC5540
8-BIT HIGH-SPEED ANALOG-TO-DIGITAL CONVERTER
SLAS105C – JANUARY 1995 – REVISED MAY 1999
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
internal reference voltage conversion
Three internal resistors allow the device to generate an internal reference voltage. These resistors are brought
out on terminals V
DDA
, REFTS, REFT, REFB, REFBS, and AGND. Two different bias voltages are possible
without the use of external resistors.
Internal resistors are provided to develop REFT = 2.6 V and REFB = 0.6 V (bias option one) with only two
external connections. This is developed with a 3-resistor network connected to V
DDA
. When using this feature,
connect REFT to REFTS and connect REFB to REFBS. For applications where the variance associated with
V
DDA
is acceptable, this internal voltage reference saves space and cost (see Figure 14).
A second internal bias option (bias two option) is shown in Figure 15. Using this scheme REFB = AGND and
REFT = 2.28 V nominal. These bias voltage options can be used to provide the values listed in the following
table.
Table 1. Bias Voltage Options
BIAS OPTION
BIAS VOLTAGE
VRT
2.63
VRB
0.61
VRT – VRB
2.02
1
2
AGND
2.28
2.28
To use the internally-generated reference voltage, terminal connections should be made as shown in
Figure 14 or Figure 15. The connections in Figure 14 provide the standard video 2-V reference.
R1
320
NOM
Rref
270
NOM
R2
80
NOM
VDDA
5 V (Analog)
REFTS
REFT
REFB
REFBS
AGND
TLC5540
16
17
22
21
23
18
0.1
μ
F
0.1
μ
F
2.63 V dc
0.61 V dc
Figure 14. External Connections Using the Internal Bias One Option
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