TLC3574 datasheet(18/39 Pages) TI

18 / 39 page

TLC3574, TLC3578, TLC2574, TLC2578

5V ANALOG, 3/5V DIGITAL, 14/12BIT, 200KSPS, 4/8CHANNEL

SERIAL ANALOGTODIGITAL CONVERTERS WITH ±10V INPUTS

SLAS262C − OCTOBER 2000 − REVISED MAY 2003

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

analog input mode (continued)

When pseudodifferential mode is selected, only two analog input channel pairs are available for the TLC3574

and TLC2574 and four channel pairs for the TLC3578 and TLC2578, because half the inputs are used as the

negative input.

Analog

MUX

SAR

ADC

X8†

X4‡

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

† TLC3578 and TLC2578

‡ TLC3574 and TLC2574

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

reference voltage

The external reference is applied to the reference-input pins (REFP and REFM). REFM should connect to

analog ground. REFP is 4 V. Install decoupling capacitors (10

µF in parallel with 0.1 µF) between REFP and

REFM, and compensation capacitors (0.1

µF) between COMP and AGND.

ideal conversion characteristics

00000000000000

00000000000001

00000000000010

01111111111111

10000000000000

10000000000001

11111111111111

11111111111110

11111111111101

16381

16383

16382

8192

8193

8191

01111111111111

01111111111110

01111111111101

00000000000001

00000000000000

11111111111111

10000000000010

10000000000001

10000000000000

Binary

BOB

2s Complement

BTC

VFS− = −10 V

−9.99939 V

−9.99878 V

−9.99756 V

−0.61 mV

9.99756 V

0.61 mV

VBZS = 0.0 V

VFS+ = 10 V

1LSB = 1.22 mV

Bipolar Analog Input Voltage

TLC3574 Datasheet(PDF) 18 Page - Texas Instruments

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