MAX1135BEAP+ Maxim Integrated Products, MAX1135BEAP+ Datasheet - Page 15

• Manufacturer Part Number: MAX1135BEAP+
• Description: IC ADC 16BIT 150KSPS 20-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1135BEAP+

• Number Of Bits: 16
• Sampling Rate (per Second): 150k
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 26.4mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Number Of Adc Inputs: 1
• Architecture: SAR
• Conversion Rate: 150 KSPs
• Resolution: 16 bit
• Interface Type: Serial
• Voltage Reference: External
• Supply Voltage (max): 3.3 V
• Mounting Style: SMD/SMT
• Input Voltage: 2.048 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 8. MAX1135 Unipolar Transfer Function, 2.048V = Full
Scale
Figures 8 and 9 show the MAX1135s’ transfer functions.
In unipolar mode, the output data is in binary format
and in bipolar mode it is in two’s complement format.
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 MAX1134/MAX1135 is measured using the end-
point method.
Differential nonlinearity (DNL) is the difference between
an actual step width and the ideal value of 1LSB. A
DNL error specification of less than 1LSB 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.
11 . . . 111
11 . . . 110
00 . . . 011
00 . . . 010
11 . . . 101
00 . . . 001
00 . . . 000
OUTPUT CODE
0
16-Bit ADCs, 150ksps, 3.3V Single Supply
1
AJ
) is the sample-to-sample variation in
______________________________________________________________________________________
INPUT VOLTAGE (LSBs)
AD
2
) is the time between the rising
3
Differential Nonlinearity
FULL-SCALE
TRANSITION
Integral Nonlinearity
Aperture Delay
Transfer Function
Aperture Jitter
FS - 3/2LSB
Definitions
FS = 2.048V
1LSB =
FS
65536
FS
For a waveform perfectly reconstructed from digital
samples, signal-to-noise ratio (SNR) is the ratio of full-
scale analog input (RMS value) to the RMS quantization
error (residual error). The ideal, theoretical minimum
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.
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:
Figure 9. MAX1135 Bipolar Transfer Function, 4.096V = Full
Scale
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
SINAD (dB) = 20 x log (Signal
OUTPUT CODE
SNR = (6.02 x N + 1.76) dB
-FS
+FS = +2.048V
-FS = -2.048V
1LSB =
Signal-to-Noise Plus Distortion
4.096V
65536
INPUT VOLTAGE (LSBs)
Signal-to-Noise Ratio
0
RMS
/ Noise
+FS - 1LSB
RMS
)
15