MAX1303BEUP+T Maxim Integrated, MAX1303BEUP+T Datasheet - Page 27

• Manufacturer Part Number: MAX1303BEUP+T
• Description: Analog to Digital Converters - ADC 16-Bit 4Ch 115ksps 4.136V Precision ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1303BEUP+T

• Rohs: yes
• Number Of Channels: 4/2
• Architecture: SAR
• Conversion Rate: 115 KSPs
• Resolution: 16 bit
• Input Type: Single-Ended/Differential
• Snr: 90 dB
• Interface Type: MICROWIRE, QSPI, SPI, Serial
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-20
• Maximum Power Dissipation: 879 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Factory Pack Quantity: 2500
• Voltage Reference: Internal, External

When a positive full-scale voltage is applied to the con-
verter inputs, the digital output is all ones (0xFFFF). The
transition from 0xFFFE to 0xFFFF occurs at 1.5 LSB
below full scale. Gain error is the amount of deviation
between the measured full-scale transition point and
the ideal full-scale transition point with the offset error
removed and all untested channels grounded.
Unipolar endpoint overlap is the change in offset when
switching between complementary input voltage
ranges. For example, the difference between the volt-
age that results in a 0xFFFF output in the -V
input voltage range and the voltage that results in a
0x0000 output in the 0V to +V
is the unipolar endpoint overlap. The unipolar endpoint
overlap is positive for the MAX1303, preventing loss of
signal or a dead zone when switching between adja-
cent analog input voltage ranges.
A 100mV
input frequency is then swept up to the point where the
amplitude of the digitized conversion result has
decreased by -3dB.
A 95% of full-scale sine wave is applied to the ADC,
and the input frequency is then swept up to the point
where the amplitude of the digitized conversion result
has decreased by -3dB.
CMRR is the ability of a device to reject a signal that is
“common” to or applied to both input terminals. The
common-mode signal can be either an AC or a DC sig-
nal or a combination of the two. CMR is expressed in
decibels. Common-mode rejection ratio is the ratio of
the differential signal gain to the common-mode signal
gain. CMRR applies only to differential operation.
PSRR is the ratio of the output-voltage shift to the
power-supply-voltage shift for a fixed input voltage. For
the MAX1303, AVDD1 can vary from 4.75V to 5.25V.
PSRR is expressed in decibels and is calculated using
the following equation:
For the MAX1303, PSRR is tested in bipolar operation
with the analog inputs grounded.
PSRR dB
[
P-P
]
=
sine wave is applied to the ADC, and the
Common-Mode Rejection Ratio (CMRR)
20
Power-Supply Rejection Ratio (PSRR)
×
______________________________________________________________________________________
log
⎛
⎜
⎝
V
OUT
Unipolar Endpoint Overlap
4-Channel, ±V
REF
Small-Signal Bandwidth
( .
5 25
5 25
Full-Power Bandwidth
.
/2 input voltage range
V
V
)
−
−
4 75
V
.
OUT
REF
Gain Error
V
( .
4 75
/2 to 0V
V
)
⎞
⎟
⎠
Aperture jitter, t
variation in the sampling instant (Figure 19).
Aperture delay, t
SCLK to the sampling instant (Figure 19).
SNR is computed by taking the ratio of the RMS signal
to the RMS noise. RMS noise includes all spectral com-
ponents to the Nyquist frequency excluding the funda-
mental, the first five harmonics, and the DC offset.
SINAD is computed by taking the ratio of the RMS sig-
nal to the RMS noise plus distortion. RMS noise plus
distortion includes all spectral components to the
Nyquist frequency excluding the fundamental and the
DC offset.
ENOB indicates the global accuracy of an ADC at a
specific input frequency and sampling rate. With an
input range equal to the ADC’s full-scale range, calcu-
late the ENOB as follows:
Figure 19. Aperture Diagram
REF
TRACK AND HOLD
ANALOG INPUT
Signal-to-Noise Plus Distortion (SINAD)
(MODE 0)
(MODE 1)
(MODE 2)
INTCLK
SCLK
SCLK
SINAD dB
Multirange Inputs,
Effective Number of Bits (ENOB)
Serial 16-Bit ADC
ENOB
(
AJ
AD
, is the statistical distribution of the
, is the time from the falling edge of
)
Signal-to-Noise Ratio (SNR)
13
15
10
=
=
TRACK
20
⎛
⎜
⎝
SINAD
×
log
6 02
14
16
11
.
⎛
⎜
⎝
−
Signal
Noise
Aperture Delay
Aperture Jitter
1 76
.
t
AD
t
AJ
⎞
⎟
⎠
RMS
RMS
SAMPLE INSTANT
15
12
HOLD
⎞
⎟
⎠
27