MAX1158AEUP+T Maxim Integrated, MAX1158AEUP+T Datasheet - Page 13

• Manufacturer Part Number: MAX1158AEUP+T
• Description: Analog to Digital Converters - ADC 14-Bit 135ksps 4.2V Precision ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1158AEUP+T

• Rohs: yes
• Number Of Channels: 1
• Architecture: SAR
• Conversion Rate: 135 KSPs
• Resolution: 14 bit
• Input Type: Single-Ended
• Snr: 85 dB
• Interface Type: Parallel
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 85 C
• Package / Case: TSSOP-20
• Maximum Power Dissipation: 879 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: Internal, 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
noise error only and results directly from the ADC’s res-
olution (N bits):
where N = 14 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) indicates the global
accuracy of an ADC at a specific input frequency and
sampling rate. An ideal ADC’s error consists of quanti-
SINAD dB
(
SNR
)
14-Bit, 135ksps, Single-Supply ADCs with
Signal-to-Noise Plus Distortion
=
20
______________________________________________________________________________________
=
( .
×
6 02
log
Effective Number of Bits



×
(
Noise Distortion
N
Signal-to-Noise Ratio
+
1 76
.
Signal
+
)
dB
RMS
)
RMS
Bipolar Analog Input Range



zation noise only. With an input range equal to the full-
scale range of the ADC, calculate the effective number
of bits as follows:
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.
5
are the 2nd- through 5th-order harmonics.
THD
1
is the fundamental amplitude and V
=
20
×
ENOB
Spurious-Free Dynamic Range
log





Total Harmonic Distortion
=
V
SINAD
2
2
+
6 02
V
.
3
2
−1 76
V
+
1
.
V
4
2
+
V
5
2





2
through
13