TLC3574IDW Datasheet, PDF (18/49 Pages) Texas Instruments – 5-V ANALOG,3-/5-V DIGITAL, 14-/12-BIT, 200-KSPS, 4-/8-CHANNEL SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH 10-V INPUTS

TLC3574, TLC3578, TLC2574, TLC2578
5ĆV ANALOG, 3Ć/5ĆV DIGITAL, 14Ć/12ĆBIT, 200ĆKSPS, 4Ć/8ĆCHANNEL
SERIAL ANALOGĆTOĆDIGITAL CONVERTERS WITH ±10ĆV INPUTS
SLAS262C − OCTOBER 2000 − REVISED MAY 2003
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.
Single Ended
Pseudodifferential
X8^† X4^‡
A0 A0
A1 A1
A2 A2
A3 A3
A4 X
A5 X
A6 X
A7 X
Analog
MUX
SAR
ADC
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
† _{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
Bipolar Analog Input Voltage
−9.99756 V
−9.99878 V
−9.99939 V
VBZS = 0.0 V
−0.61 mV 0.61 mV
1LSB = 1.22 mV
9.99756 V
VFS− = −10 V
VFS+ = 10 V
2s Complement
BTC
01111111111111
01111111111110
01111111111101
Binary
BOB
11111111111111
11111111111110
11111111111101
16383
16382
16381
00000000000001
00000000000000
11111111111111
10000000000001
10000000000000
01111111111111
8193
8192
8191
10000000000010 00000000000010
2
10000000000001 00000000000001
1
10000000000000 00000000000000
0
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