MAX1145BEAP+ Maxim Integrated Products, MAX1145BEAP+ Datasheet - Page 15

• Manufacturer Part Number: MAX1145BEAP+
• Description: IC ADC 14BIT 150KSPS 20-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1145BEAP+

• Number Of Bits: 14
• 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
• Conversion Rate: 150 KSPs
• Resolution: 14 bit
• Interface Type: Serial (3-Wire, SPI, QSPI, Microwire)
• Snr: 82 dB
• Voltage Reference: 2.048 V
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Maximum Power Dissipation: 640 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Input Voltage: 3.3 V
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 8. MAX1145 Unipolar Transfer Function, 2.048V = Full
Scale
Figures 8 and 9 show the MAX1145’s 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 MAX1144/MAX1145 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.
11 . . . 111
11 . . . 110
11 . . . 101
00 . . . 011
00 . . . 010
00 . . . 001
00 . . . 000
OUTPUT CODE
0
14-Bit ADCs, 150ksps, 3.3V Single Supply
AJ
1
) is the sample-to-sample variation in
______________________________________________________________________________________
INPUT VOLTAGE (LSBs)
2
3
Differential Nonlinearity
FULL-SCALE
TRANSITION
Integral Nonlinearity
Transfer Function
Aperture Jitter
FS - 3/2LSB
Definitions
FS = 2.048V
1LSB =
FS
16384
FS
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 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.
Figure 9. MAX1145 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
OUTPUT CODE
SNR = (6.02 x N + 1.76) dB
-FS
+FS = +2.048V
-FS = -2.048V
1LSB =
AD
4.096V
16384
) is the time between the rising
INPUT VOLTAGE (LSBs)
Signal-to-Noise Ratio
0
Aperture Delay
+FS - 1LSB
15