MAX1281BEUP-T Maxim Integrated, MAX1281BEUP-T Datasheet - Page 21

• Manufacturer Part Number: MAX1281BEUP-T
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1281BEUP-T

• Number Of Channels: 8/4
• Architecture: SAR
• Conversion Rate: 300 KSPs
• Resolution: 12 bit
• Input Type: Single-Ended/Pseudo-Differential
• Snr: 70 dB
• Interface Type: 4-Wire (SPI, Microwire, QSPI, TMS320)
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-20
• Maximum Power Dissipation: 559 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: 2.5 V

Figure 17. QSPI Connections
Figure 18. MAX1280/MAX1281-to-TMS320 Serial Interface
Aperture delay (t
falling edge of the sampling clock and the instant when
an actual sample is taken.
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
TMS320LC3x
ANALOG
INPUTS
V
DD1
CLKX
CLKR
FSR
DX
DR
AD
XF
______________________________________________________________________________________
) is the time defined between the
10
1
2
3
4
5
6
7
8
9
SHDN
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
Serial 12-Bit ADCs with Internal Reference
MAX1280
MAX1281
CS
SCLK
DIN
DOUT
SSTRB
REFADJ
SSTRB
DOUT
SCLK
V
V
GND
Aperture Delay
REF
DD1
DD2
DIN
CS
MAX1280
MAX1281
14
20
19
18
17
16
15
13
12
11
4.7µF
0.1µF
0.01µF
+3V OR +5V
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 ratio plus distortion (SINAD) is the ratio
of the fundamental input frequency’s RMS amplitude to
RMS equivalent of all other ADC output signals.
10µF
SINAD (dB) = 20
+3V OR +5V
SNR = (6.02
(POWER SUPPLIES)
SCK
PCS0
MOSI
MISO
Signal-to-Noise Plus Distortion
✕
log (Signal
MC683XX
(GND)
✕
Signal-to-Noise Ratio
N + 1.76)dB
RMS
/ Noise
RMS
)
21