MAX109 Maxim Integrated Products, MAX109 Datasheet - Page 27

• Manufacturer Part Number: MAX109
• Description: 2.2Gsps ADC
• Manufacturer: Maxim Integrated Products

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distortion includes all spectral components to the
Nyquist frequency excluding the fundamental and the
DC offset.
ENOB indicates the global accuracy of an ADC at a
specific input frequency and sampling rate. An ideal
ADC’s error consists of quantization noise only. ENOB
is calculated from a curve fit referenced to the theoreti-
cal full-scale range.
THD is the ratio of the RMS sum of the first 15 harmon-
ics of the input signal to the fundamental itself. This is
expressed as:
where V1 is the fundamental amplitude, and V
V
harmonics (HD2 through HD16).
16
are the amplitudes of the 2nd- through 16th-order
THD 20 log
=
Effective Number of Bits (ENOB)
Total Harmonic Distortion (THD)
8-Bit, 2.2Gsps ADC with Track/Hold Amplifier
×
______________________________________________________________________________________
⎛
⎜
⎜
⎝
V
2
2
+
V
and 1:4 Demultiplexed LVDS Outputs
3
2
V
1
+ +
... V
16
2
⎞
⎟
⎟
⎠
2
through
SFDR is the ratio expressed in decibels of the RMS
amplitude of the fundamental (maximum signal compo-
nent) to the RMS value of the next largest spurious
component, excluding DC offset.
IM3 is the total power of the third-order intermodulation
product to the Nyquist frequency relative to the total
input power of the two input tones, f
individual input tone levels are at -7dBFS. The third-order
intermodulation products are located at 2 x f
f
A large -1dBFS analog input signal is applied to an
ADC and the input frequency is swept up to the point
where the amplitude of the digitized conversion result
has decreased by -3dB. This point is defined as full-
power input bandwidth frequency.
IN2
-f
IN1
Spurious-Free Dynamic Range (SFDR)
, 2 x f
Third-Order Intermodulation (IM3)
IN1
+f
IN2
, and 2 x f
Full-Power Bandwidth
IN2
+f
IN1
IN
.
1 and f
IN1
-f
IN
IN2
2. The
, 2 x
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