MAX1075ETC-T Maxim Integrated, MAX1075ETC-T Datasheet - Page 16

• Manufacturer Part Number: MAX1075ETC-T
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1075ETC-T

• Number Of Channels: 1
• Architecture: SAR
• Conversion Rate: 1.8 MSPs
• Resolution: 10 bit
• Input Type: Differential
• Snr: No
• Interface Type: 3-Wire, Microwire, QSPI, Serial, SPI
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 85 C
• Package / Case: TQFN EP
• Maximum Power Dissipation: 1349 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: External

For a waveform perfectly reconstructed from digital sam-
ples, signal-to-noise ratio (SNR) is the ratio of full-scale
analog input (RMS value) to the RMS quantization error
(residual error). The theoretical minimum analog-to-digital
noise is caused by quantization error, and results directly
from the ADC’s resolution (N bits):
In reality, there are other noise sources besides quantiza-
tion 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 fundamental, the first five
harmonics, and the DC offset.
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 quantiza-
tion noise only. With an input range equal to the full-scale
range of the ADC, calculate the ENOB as follows:
1.8Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs
Figure 19. Interfacing to the ADSP21_ _ _
16
______________________________________________________________________________________
SINAD(dB) = 20 x log (Signal
MAX1072
MAX1075
ENOB
SNR = (6.02 x N + 1.76)dB
CNVST
DOUT
SCLK
Signal-to-Noise Plus Distortion
V
L
=
Effective Number of Bits
(
SINAD
Signal-to-Noise Ratio
6 02
.
− 1 76
RMS
VDDINT
TCLK
RCLK
TFS
RFS
DR
.
/ Noise
ADSP21_ _ _
)
RMS
)
Total harmonic distortion (THD) is 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
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.
Full-power bandwidth is the frequency at which the input
signal amplitude attenuates by 3dB for a full-scale input.
Figure 20. Power-Supply Grounding Condition
5
are the amplitudes of the 2nd- through 5th-order
V
V
DD
DD
1
THD
is the fundamental amplitude, and V
0.1μF
10μF
=
MAX1072
MAX1075
20
Spurious-Free Dynamic Range
GND RGND
x
log
GND
Total Harmonic Distortion
⎛
⎜
⎜
⎜
⎝
SUPPLIES
0.1μF
10μF
Full-Power Bandwidth
V
2
2
+
V
V
L
3
2
V
1
+
V
4
2
+
CIRCUITRY
DGND
DIGITAL
V
5
2
⎞
⎟
⎟
⎟
⎠
2
through
V
V
L
L