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| 型號(hào)： | TLC5540CNSRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDSO24 |
| 封裝： | GREEN, PLASTIC, SOP-24 |
| 文件頁(yè)數(shù)： | 5/21頁(yè) |
| 文件大?。?/td> | 407K |
| 代理商： | TLC5540CNSRG4 |
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TLC5540
SLAS105D JANUARY 1995 REVISED APRIL 2004
www.ti.com
13
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 VDDA, 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 VDDA. When using this feature,
connect REFT to REFTS and connect REFB to REFBS. For applications where the variance associated with
VDDA 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
BIAS OPTION
VRB
VRT
VRT VRB
1
0.61
2.63
2.02
2
AGND
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
F
0.1
F
2.63 V dc
0.61 V dc
Figure 14. External Connections Using the Internal Bias One Option
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