MAX1090BEEI Maxim Integrated, MAX1090BEEI Datasheet - Page 18

• Manufacturer Part Number: MAX1090BEEI
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1090BEEI

• Number Of Channels: 8/4
• Architecture: SAR
• Conversion Rate: 400 KSPs
• Resolution: 10 bit
• Input Type: Single-Ended/Pseudo-Differential
• Snr: Yes
• Interface Type: Parallel
• Operating Supply Voltage: 2.7 V to 5.5 V, 5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QSOP-28
• Maximum Power Dissipation: 667 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: Internal 2.5 V or External

For a waveform perfectly reconstructed from digital
samples, signal-to-noise ratio (SNR) is the ratio of the
full-scale analog input (RMS value) to the RMS quanti-
zation error (residual error). The ideal theoretical mini-
mum analog-to-digital noise is caused by quantization
error only and results directly from the ADC’s resolution
(N bits):
In reality, there are other noise sources besides quanti-
zation noise, including thermal noise, reference noise,
clock jitter, etc. Therefore, SNR is computed by taking
the ratio of the RMS signal to the RMS noise, which
includes all spectral components minus the fundamen-
tal, the first five harmonics, and the DC offset.
400ksps, +5V, 8-/4-Channel, 10-Bit ADCs
with +2.5V Reference and Parallel Interface
Figure 11. Power-Supply and Grounding Connections
18
R* = 5Ω
______________________________________________________________________________________
*OPTIONAL
V
+3V
DD
4.7µF
0.1µF
SNR = (6.02 x N + 1.76)dB
MAX1090
MAX1092
GND
SUPPLIES
Signal-to-Noise Ratio
COM
V
LOGIC
= +3V/+5V GND
+3V/+5V
CIRCUITRY
DIGITAL
DGND
Signal-to-noise plus distortion (SINAD) is the ratio of the
fundamental input frequency’s RMS amplitude to the
RMS equivalent of all other ADC output signals.
Effective number of bits (ENOB) indicates the global
accuracy of an ADC at a specific input frequency and
sampling rate. An ideal ADC’s error consists of quanti-
zation noise only. With an input range equal to the
ADC’s full-scale range, calculate the ENOB as follows:
Total harmonic distortion (THD) is the ratio of the RMS
sum of the input signal’s first five harmonics to the fun-
damental itself. This is expressed as:
where V
V
harmonics.
Spurious-free dynamic range (SFDR) is the ratio of the
RMS amplitude of the fundamental (maximum signal
component) to the RMS value of the next-largest distor-
tion component.
TRANSISTOR COUNT: 5781
5
THD
are the amplitudes of the 2nd- through 5th-order
SINAD (dB) = 20 x log (Signal
=
1
is the fundamental amplitude, and V
20
ENOB = (SINAD - 1.76) / 6.02
×
Signal-to-Noise Plus Distortion
Spurious-Free Dynamic Range
log



Total Harmonic Distortion


Effective Number of Bits
V
2
2
+
Chip Information
V
3
2
RMS
+
V
4
2
/ Noise
+
V
5
2
RMS
2


through
/
)
V
1


