MAX5866ETM Maxim Integrated Products, MAX5866ETM Datasheet - Page 23

• Manufacturer Part Number: MAX5866ETM
• Description: CODECs
• Manufacturer: Maxim Integrated Products

Specifications of MAX5866ETM

• Lead Free Status / Rohs Status: No

Ideally, the midscale transition occurs at 0.5 LSB above
midscale. The offset error is the amount of deviation
between the measured transition point and the ideal
transition point.
Offset error (Figure 12a) is the difference between the
ideal and actual offset point. The offset point is the out-
put value when the digital input is midscale. This error
affects all codes by the same amount and usually can
be compensated by trimming.
Ideally, the ADC full-scale transition occurs at 1.5 LSB
below full scale. The gain error is the amount of devia-
tion between the measured transition point and the
ideal transition point with the offset error removed.
Figure 13 depicts the aperture jitter (t
sample-to-sample variation in the aperture delay.
Aperture delay (t
rising edge of the sampling clock and the instant when
an actual sample is taken (Figure 13).
For a waveform perfectly reconstructed from digital
samples, the theoretical maximum SNR is the ratio of
the full-scale analog input (RMS value) to the RMS
quantization error (residual error) and results directly
from the ADC’s resolution (N bits):
In reality, there are other noise sources besides quanti-
zation noise: thermal noise, reference noise, clock jitter,
etc. SNR is computed by taking the ratio of the RMS
signal to the RMS noise. RMS noise includes all spec-
tral components to the Nyquist frequency excluding the
fundamental, the first five harmonics, and the DC offset.
SINAD is computed by taking the ratio of the RMS sig-
nal to the RMS noise. RMS noise includes all spectral
components to the Nyquist frequency excluding the
fundamental and the DC offset.
ENOB specifies the dynamic performance of an ADC at a
specific input frequency and sampling rate. An ideal
ADC’s error consists of quantization noise only. ENOB for
a full-scale sinusoidal input waveform is computed from:
SNR(max) = 6.02dB x N + 1.76dB (in dB)
ADC Dynamic Parameter Definitions
ENOB = (SINAD - 1. 76) / 6.02
Signal-to-Noise Plus Distortion (SINAD)
AD
______________________________________________________________________________________
Performance, 60Msps Analog Front End
) is the time defined between the
Effective Number of Bits (ENOB)
Signal-to-Noise Ratio (SNR)
ADC Offset Error
DAC Offset Error
Ultra-Low-Power, High-Dynamic-
AJ
ADC Gain Error
Aperture Delay
Aperture Jitter
), which is the
THD is typically the ratio of the RMS sum of the first five
harmonics of the input signal to the fundamental itself.
This is expressed as:
where V
the amplitudes of the 2nd- through 6th-order harmonics.
HD3 is defined as the ratio of the RMS value of the third
harmonic component to the fundamental input signal.
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.
IMD is the total power of the intermodulation products
relative to the total input power when two tones, f
f
ucts are (f
±f
IM3 is the power of the worst third-order intermodula-
tion product relative to the input power of either input
tone when two tones, f
inputs. The 3rd-order intermodulation products are (2 x
f
at -7dBFS.
Figure 13. T/H Aperture Timing
2
1
, are present at the inputs. The intermodulation prod-
1
±f
). The individual input tone levels are at -7dBFS.
2
), (2
THD
DATA (T/H)
1
SAMPLED
ANALOG
is the fundamental amplitude and V
1
INPUT
CLK
=
T/H
±f
f
2
t
2
20log
AD
Spurious-Free Dynamic Range (SFDR)
±f
), (2
TRACK
1
). The individual input tone levels are




Third Harmonic Distortion (HD3)
Intermodulation Distortion (IMD)
Total Harmonic Distortion (THD)
3rd-Order Intermodulation (IM3)
(V + V + V + V + V )
f
1
), (2
2
2
1
and f
t
AJ
HOLD
3
2
f
2
2
V
), (2
, are present at the
1
4
2
TRACK
5
2
f
1
±f
6
2
2
), (2
2




–V
1
6
and
are
23
f
2