MAX1162EVKIT Maxim Integrated Products, MAX1162EVKIT Datasheet - Page 16

• Manufacturer Part Number: MAX1162EVKIT
• Description: EVAL KIT FOR MAX1162
• Manufacturer: Maxim Integrated Products

Specifications of MAX1162EVKIT

• Number Of Adc's: 1
• Number Of Bits: 16
• Sampling Rate (per Second): 200k
• Data Interface: Serial
• Inputs Per Adc: 1 Single Ended
• Input Range: 0 ~ VREF
• Power (typ) @ Conditions: 12.5mW @ 200kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: 0°C ~ 70°C
• Utilized Ic / Part: MAX1162, MAX1062
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

16-Bit, +5V, 200ksps ADC with 10µA
Shutdown
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,
excluding the DC offset.
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-
scale range of the ADC, calculate the effective number
of bits as follows:
16
Figure 13. Effective Number of Bits vs. Input Frequency
SINAD dB
______________________________________________________________________________________
(
16
14
12
10
8
6
4
2
0
0.1
SNR = (6.02 x N + 1.76)dB
)
Signal-to-Noise Plus Distortion
=
20
ENOB vs. INPUT FREQUENCY
×
INPUT FREQUENCY (kHz)
log
Effective Number of Bits
1
⎡
⎢
⎢
⎣
(
Signal-to-Noise Ratio
Noise
10
Signal
+
Distortion
RMS
100
)
RMS
⎤
⎥
⎥
⎦
Figure 13 shows the effective number of bits as a func-
tion of the MAX1162’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 MAX1162 (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
=
20
ENOB = (SINAD - 1.76) / 6.02
0.1µF
×
log
Spurious-Free Dynamic Range
Supplies, Layout, Grounding,
⎡
⎢
⎢
⎢
⎣
DD
10Ω
0.1µF
Total Harmonic Distortion
V
2
and DV
2
+
DV
REF
AV
AIN
V
DD
DD
3
2
DD
V
+
1
MAX1162
from a Single Supply
V
4
2
and Bypassing
+
GND
V
AGND
DGND
5
SCLK
DOUT
2
CS
⎤
⎥
⎥
⎥
⎦
2
through
DOUT
SCLK
CS