TLC3544, TLC3548

5-V ANALOG, 3-/5-V DIGITAL, 14-BIT, 200-KSPS, 4-/8-CHANNELS SERIAL

ANALOG-TO-DIGITAL CONVERTERS WITH 0-5 V (PSEUDODIFFERENTIAL) INPUTS

SLAS266C – OCTOBER 2000 – REVISED MAY 2003

15

POST OFFICE BOX 655303

analog input mode (continued)

Analog

MUX

SAR

ADC

X8†

A0

A1

A2

A3

A4

A5

A6

A7

X4‡

A0

A1

A2

A3

X

X

X

X

X8†

A0(+) Pair A

A1(–)

A2(+) Pair B

A3(–)

A4(+) Pair C

A5(–)

A6(+) Pair D

A7(–)

X4‡

A0(+) Pair A

A1(–)

A2(+) Pair B

A3(–)

Analog

MUX

SAR

ADC

Single Ended

Pseudodifferential

† TLC3548

‡ TLC3544

Figure 7. Pin Assignment of Single-Ended Input vs Pseudodifferential Input

reference voltage

There is a built-in 4-V reference. If the internal reference is used, REFP is internally set to 4-V and REFM is set

to 0-V. The external reference can be applied to the reference-input pins (REFP and REFM) if programmed (see

Table 2). The REFM pin should connect to analog ground. REFP can be 3-V to 5-V. Install decoupling capacitors

(10

µF in parallel with 0.1 µF) between REFP and REFM. Install compensation capacitors (10 µF in parallel with

0.1

µF for internal reference, 0.1 µF only for external reference) between BGAP and AGND.