Datasheet
TLC1514, TLC1518
5-V, 10-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS252 – DECEMBER 1999
32
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
1000000000
0111111111
0000000010
0000000001
0000000000
1111111110
0 0.00976 2.4937 2.4986 2.5034
Digital Output Code
1000000001
1111111101
1111111111
4.9874 4.9922 4.9871
512
511
2
1
0
1022
Step
513
1021
1023
0.00244
V
I
– Analog Input Voltage – V
V
ZT
=V
ZS
+ 1/2 LSB
V
ZS
See Notes A and B
4.9898
0.00488
V
FT
= V
FS
– 1/2 LSB
V
FS
V
FS
Nom
NOTES: A. This curve is based on the assumption that V
ref+
and V
ref–
have been adjusted so that the voltage at the transition from digital 0 to
1 (V
ZT
) is 2.44 mV, and the transition to full scale (V
FT
) is 4.9898 V, 1 LSB = 4.88 mV.
B. The full scale value (V
FS
) is the step whose nominal midstep value has the highest absolute value. The zero-scale value (V
ZS
) is
the step whose nominal midstep value equals zero.
Figure 36. Ideal 10-Bit ADC Conversion Characteristics
GND
CS
XF
TMS320 DSP
TLC1514/
TLC1518
SDI
SDO
SCLK
INT
TXD
RXD
CLKR
BIO
10 kΩ
v
cc
A
IN
V
DD
FSR
FS
CLKX
FSX
Figure 37. Typical Interface to a TMS320 DSP