Appendix D
623
TLC5510, TLC5510A
8-BIT HIGH-SPEED ANALOG-TO-DIGITAL CONVERTERS
SLAS095L – SEPTEMBER 1994 – REVISED JUNE 2003
7
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
internal referencing
TLC5510
The three internal resistors shown with V
DDA
can generate a 2-V reference voltage. These resistors are brought
out on V
DDA
, REFTS, REFT, REFB, REFBS, and AGND.
To use the internally generated reference voltage, terminal connections should be made as shown in Figure 3.
This connection provides the standard video 2-V reference for the nominal digital output.
R1
320 Ω NOM
R
ref
270 Ω NOM
R2
80 Ω NOM
V
DDA
(analog supply)
REFTS
REFT
REFB
REFBS
AGND
TLC5510
16
17
22
21
23
18
Figure 3. External Connections for a 2-V Analog Input Span Using the Internal-Reference Resistor Divider
TLC5510A
For an analog input span of 4 V, 4 V is supplied to REFT, and REFB is grounded and terminal connections should
be made as shown in Figure 4. This connection provides the 4-V reference for the nominal zero to full-scale
digital output with a 4 V
pp
analog input at ANALOG IN.
R1
320 Ω NOM
R
ref
270 Ω NOM
R2
80 Ω NOM
REFTS
REFT
REFB
REFBS
AGND
TLC5510A
16
17
22
21
23
18
4 V
V
DDA
(analog supply)
Figure 4. External Connections for 4-V Analog Input Span
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