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 VDDA can generate a 2-V reference voltage. These resistors are brought

out on VDDA, 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

Rref

270

Ω NOM

R2

80

Ω NOM

VDDA

(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 Vpp analog input at ANALOG IN.

R1

320

Ω NOM

Rref

270

Ω NOM

R2

80

Ω NOM

REFTS

REFT

REFB

REFBS

AGND

TLC5510A

16

17

22

21

23

18

4 V

VDDA

(analog supply)

Figure 4. External Connections for 4-V Analog Input Span