TLC5510AINSR Datasheet, PDF (7/15 Pages) Texas Instruments – 8-BIT HIGH-SPEED ANALOG-TO-DIGITAL CONVERTERS

TLC5510, TLC5510A
8-BIT HIGH-SPEED ANALOG-TO-DIGITAL CONVERTERS
SLAS095L – SEPTEMBER 1994 – REVISED JUNE 2003
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.
VDDA
18
(analog supply)
REFTS ₁₆
17
REFT
REFB ₂₃
22
REFBS
AGND 21
TLC5510
R1
320 Ω NOM
Rref
270 Ω NOM
R2
80 Ω NOM
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.
VDDA
18
(analog supply)
16
REFTS
17
4V
REFT
REFB ₂₃
REFBS ²²
21
AGND
TLC5510A
R1
320 Ω NOM
Rref
270 Ω NOM
R2
80 Ω NOM
Figure 4. External Connections for 4-V Analog Input Span
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
7