MAX1062CCUB-T Maxim Integrated, MAX1062CCUB-T Datasheet - Page 15

• Manufacturer Part Number: MAX1062CCUB-T
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1062CCUB-T

• Number Of Channels: 1
• Architecture: SAR
• Conversion Rate: 200 KSPs
• Resolution: 14 bit
• Input Type: Single-Ended
• Snr: 84 dB
• Interface Type: QSPI, Serial (SPI, Microwire)
• Operating Supply Voltage: 2.7 V to 5.25 V, 5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: uMAX
• Maximum Power Dissipation: 444 mW
• Minimum Operating Temperature: 0 C
• Number Of Converters: 1
• Voltage Reference: 4.096 V

time between the falling edge of the sampling clock
and the instant when the actual sample is taken.
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
noise error only and results directly from the ADCs res-
olution (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, which includes all spectral
components minus the fundamental, the first five har-
monics, 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 the other ADC output signals.
Effective number of bits (ENOB) indicate the global
accuracy of an ADC at a specific input frequency and
sampling rate. An ideal ADC error consists of quantiza-
tion noise only. With an input range equal to the full-
Figure 13. Effective Bits vs. Input Frequency
14-Bit, +5V, 200ksps ADC with 10µA Shutdown
SINAD dB
(
14
12
10
8
6
4
2
0
SNR = (6.02 x N + 1.76)dB
)
0.1
Signal-to-Noise Plus Distortion
=
f
SAMPLE
20
______________________________________________________________________________________
×
= 200kHz
INPUT FREQUENCY (kHz)
log
Effective Number of Bits
1
⎡
⎢
⎢
⎣
(
Signal-to-Noise Ratio
Noise
10
Signal
+
Distortion
RMS
100
)
RMS
⎤
⎥
⎥
⎦
scale range of the ADC, calculate the effective number
of bits as follows:
Figure 13 shows the effective number of bits as a func-
tion of the MAX1062’s input frequency.
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
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 fre-
quency component.
Use PC boards with separate analog and digital
ground planes. Do not use wire-wrap boards. Connect
the two ground planes together at the MAX1062 (pin 3).
Isolate the digital supply from the analog with a low-
value resistor (10Ω) or ferrite bead when the analog
and digital supplies come from the same source
(Figure 14).
Figure 14. Powering AV
5
are the 2nd- through 5th-order harmonics.
V
+5V
AIN
REF
THD
1
is the fundamental amplitude and V
4.7µF
=
ENOB = (SINAD – 1.76) / 6.02
20
0.1µF
Spurious-Free Dynamic Range
×
log
Supplies, Layout, Grounding
DD
10Ω
⎡
⎢
⎢
⎢
⎣
0.1µF
Total Harmonic Distortion
and DV
V
2
DV
REF
AV
AIN
2
DD
DD
+
DD
V
3
MAX1062
from a Single Supply
2
V
+
1
V
and Bypassing
GND
4
2
AGND
DGND
SCLK
DOUT
+
CS
V
5
2
2
⎤
⎥
⎥
⎥
⎦
SCLK
DOUT
CS
through
15