Datasheet

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 • DALLAS, TEXAS 75265
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.