Specifications

ACTUAL
POSITIVE
FULL-SCALE
TRANSITION
-V
IN
/2
ACTUAL NEGATIVE
FULL-SCALE TRANSITION
1111 1111 1111 (4095)
1111 1111 1110 (4094)
1111 1111 1101 (4093)
MID-SCALE
TRANSITION
(V
IN
+) < (V
IN
-) (V
IN
+) > (V
IN
-)
0.0V
Differential Analog Input Voltage (+V
IN
/2) - (-V
IN
/2)
Output
Code
OFFSET
ERROR
1000 0000 0000 (2048)
0111 1111 1111 (2047)
IDEAL
POSITIVE
FULL-SCALE
TRANSITION
POSITIVE
FULL-SCALE
ERROR
NEGATIVE
FULL-SCALE
ERROR
IDEAL NEGATIVE
FULL-SCALE TRANSITION
+V
IN
/2
0000 0000 0000 (0)
0000 0000 0001 (1)
0000 0000 0010 (2)
THD = 20 x log
+ . . . + AA
f2
2
f10
2
A
f1
2
ADC12D1800RF
SNAS518I –JULY 2011–REVISED JANUARY 2014 www.ti.com
TOTAL HARMONIC DISTORTION (THD) is the ratio expressed in dB, of the rms total of the first nine
harmonic levels at the output to the level of the fundamental at the output. THD is calculated as
where
A
f1
is the RMS power of the fundamental (output) frequency and A
f2
through A
f10
are the RMS power of the first
9 harmonic frequencies in the output spectrum. (2)
Second Harmonic Distortion (2nd Harm) is the difference, expressed in dB, between the RMS power in
the input frequency seen at the output and the power in its 2nd harmonic level at the output.
Third Harmonic Distortion (3rd Harm) is the difference expressed in dB between the RMS power in the
input frequency seen at the output and the power in its 3rd harmonic level at the output.
4.1 Transfer Characteristic
Figure 4-2. Input / Output Transfer Characteristic
32 Specification Definitions Copyright © 2011–2014, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: ADC12D1800RF