MAX1267ACEG+T Maxim Integrated, MAX1267ACEG+T Datasheet - Page 17

• Manufacturer Part Number: MAX1267ACEG+T
• Description: Analog to Digital Converters - ADC 12-Bit 2Ch 265ksps 3.6V Precision ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1267ACEG+T

• Rohs: yes
• Number Of Channels: 2/1
• Architecture: SAR
• Conversion Rate: 265 KSPs
• Resolution: 12 bit
• Input Type: Single-Ended/Pseudo-Differential
• Snr: 70 dB
• Interface Type: Parallel
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 70 C
• Package / Case: QSOP-24
• Maximum Power Dissipation: 762 mW
• Minimum Operating Temperature: 0 C
• Number Of Converters: 1
• Voltage Reference: 2.5 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. INL for
the MAX1265/MAX1267 is measured 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 less than 1 LSB guarantees
no missing codes and a monotonic transfer function.
Aperture jitter (t
the time between the samples.
Aperture delay (t
edge of the sampling clock and the instant when an
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
error only and results directly from the ADC’s resolution
(N bits):
In reality, there are other noise sources besides quanti-
zation noise, including thermal noise, reference noise,
clock jitter, etc. Therefore, SNR is calculated by taking
the ratio of the RMS signal to the RMS noise, which
includes all spectral components minus the fundamen-
tal, the first five harmonics, and the DC offset.
with +2.5V Reference and Parallel Interface
SNR = (6.02
AJ
) is the sample-to-sample variation in
______________________________________________________________________________________
AD
) is the time between the rising
265ksps, +3V, 6-/2-Channel, 12-Bit ADCs
Differential Nonlinearity
✕
Signal-to-Noise Ratio
Integral Nonlinearity
N + 1.76)dB
Aperture Delay
Aperture Jitter
Definitions
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 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:
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 V1 is the fundamental amplitude, and V2 through
V5 are the amplitudes of the 2nd- through 5th-order
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.
TRANSISTOR COUNT: 5781
SUBSTRATE CONNECTED TO GND
THD
SINAD (dB) = 20 x log (Signal
=
20
ENOB = (SINAD - 1.76) / 6.02
x
log
Signal-to-Noise Plus Distortion
Spurious-Free Dynamic Range



(
Total Harmonic Distortion
V
2
Effective Number of Bits
2
+
Chip Information
V
3
2
+
RMS
V
4
2
/ Noise
+
V
5
2
)
RMS
/
V
1
)



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