TLC3544_07 Datasheet, PDF (15/42 Pages) Texas Instruments – 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

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
analog input mode (continued)
X8^† X4^‡
A0 A0
A1 A1
A2 A2
A3 A3
A4 X
A5 X
A6 X
A7 X
Single Ended
Analog
MUX
SAR
ADC
X8^†
A0(+) Pair A
A1(–)
A2(+) Pair B
A3(–)
A4(+) Pair C
A5(–)
A6(+) Pair D
A7(–)
Pseudodifferential
X4^‡
A0(+) Pair A
A1(–)
A2(+) Pair B
A3(–)
Analog
MUX
SAR
ADC
† _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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
15