MAX1322ECM Maxim Integrated, MAX1322ECM Datasheet - Page 23

• Manufacturer Part Number: MAX1322ECM
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1322ECM

• Number Of Channels: 2
• Architecture: SAR
• Conversion Rate: 526 KSPs
• Resolution: 14 bit
• Input Type: Single-Ended
• Snr: 76 dB
• Interface Type: Parallel
• Operating Supply Voltage: 2.7 V to 5.25 V, 4.75 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Package / Case: LQFP-48
• Maximum Power Dissipation: 1818 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: 2.5 V

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:
The 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-
zation 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.
8-/4-/2-Channel, 14-Bit, Simultaneous-Sampling ADCs
5
are the 2nd- through 5th-order harmonics.
SINAD dB
THD
with ±10V, ±5V, and 0 to +5V Analog Input Ranges
1
(
=
is the fundamental amplitude and V
20
)
=
×
ENOB
Signal-to-Noise Plus Distortion
20
Spurious-Free Dynamic Range
log
______________________________________________________________________________________
×
⎡
⎢
⎢
⎢
⎣
Total Harmonic Distortion
log
=
V
Effective Number of Bits
2
SINAD
⎡
⎢
⎣
2
(
Noise
+
6 02
V
.
3
2
- 1 76
Signal
V
+
+
1
.
Distortion
V
4
2
RMS
+
V
5
)
RMS
2
2
⎤
⎥
⎥
⎥
⎦
through
⎤
⎥
⎦
Aperture delay (t
clock edge to the instant when an actual sample is taken.
Aperture Jitter (t
aperture delay.
Channel-to-channel isolation indicates how well each
analog input is isolated from the other channels. Channel-
to-channel isolation is measured by applying DC to chan-
nels 1 to 7, while a -0.5dBFS sine wave is applied to
channel 0. A 100kHz FFT is taken for channel 0 and
channel 1. Channel-to-channel isolation is expressed in
dB as the power ratio of the two 100kHz magnitudes.
A small -20dBFS analog input signal is applied to an
ADC in a manner that ensures that the signal’s slew
rate does not limit the ADC’s performance. The input
frequency is then swept up to the point where the
amplitude of the digitized conversion result has
decreased 3dB.
A large -0.5dBFS analog input signal is applied to an
ADC, and the input frequency is swept up to the point
where the amplitude of the digitized conversion result
has decreased by 3dB. This point is defined as full-
power input bandwidth frequency.
TRANSISTOR COUNT: 80,000
PROCESS: BiCMOS 0.6µm
AJ
AD
Channel-to-Channel Isolation
) is the sample-to-sample variation in
) is the time delay from the sampling
Small-Signal Bandwidth
Full-Power Bandwidth
Chip Information
Aperture Delay
Aperture Jitter
23