MAX1177BEUP-T Maxim Integrated, MAX1177BEUP-T Datasheet - Page 11

• Manufacturer Part Number: MAX1177BEUP-T
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1177BEUP-T

• Number Of Channels: 1
• Architecture: SAR
• Conversion Rate: 135 KSPs
• Resolution: 16 bit
• Input Type: Single-Ended
• Snr: 91 dB
• Interface Type: Parallel
• Operating Supply Voltage: 4.75 V to 5.25 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: 4.096 V

Integral nonlinearity (INL) is the deviation of the values
on an actual transfer function from a straight line. This
straight line can be either a best-straight-line fit or a line
drawn between the end points of the transfer function,
once offset and gain errors have been nullified. The
static linearity parameters for the MAX1177 are mea-
sured using the end-point method.
Differential nonlinearity (DNL) is the difference between
an actual step width and the ideal value of 1 LSB. A
DNL error specification of 1 LSB guarantees no missing
codes and a monotonic transfer function.
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 = 16 bits.
In reality, there are other noise sources besides quanti-
zation noise: thermal noise, reference noise, clock jitter,
etc. The SNR is computed by taking the ratio of the
RMS signal to the RMS noise, which includes all spec-
tral components minus the fundamental, the first five
harmonics, and the DC offset.
SNR
______________________________________________________________________________________
=
( .
6 02
Differential Nonlinearity
×
Signal-to-Noise Ratio
Integral Nonlinearity
N
16-Bit, 135ksps, Single-Supply ADC
+
1 76
.
)
Definitions
dB
with 0 to 10V Input Range
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 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:
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.
SINAD dB
THD
1
is the fundamental amplitude and V
(
=
20
)
=
Signal-to-Noise Plus Distortion
ENOB
Spurious-Free Dynamic Range
×
20
log
×
Total Harmonic Distortion
log





=
Effective Number of Bits
SINAD
V



2
(
Noise Distortion
2
6 02
+
.
V
−1 76
3
Signal
2
+
V
.
+
1
V
4
2
RMS
+
V
5
)
2
RMS
2





through



11