MAX1285BCSA Maxim, MAX1285BCSA Datasheet - Page 13

• Manufacturer Part Number: MAX1285BCSA
• Description: 400ksps/300ksps / Single-Supply / Low-Power / Serial 12-Bit ADCs with Internal Reference
• Manufacturer: Maxim

Figure 14 shows the recommended system ground con-
nections. Establish a single-point analog ground (“star”
ground point) at GND, separate from the logic ground.
Connect all other analog grounds and DGND to this star
ground point for further noise reduction. No other digital
system ground should be connected to this single-point
analog ground. The ground return to the power supply for
this ground should be low impedance and as short as
possible for noise-free operation.
High-frequency noise in the V
the ADC’s high-speed comparator. Bypass this supply to
the single-point analog ground with 0.1µF and 10µF
bypass capacitors. Minimize capacitor lead lengths for
best supply noise rejection. To reduce the effects of sup-
ply noise, a 10 resistor can be connected as a lowpass
filter to attenuate supply noise (Figure 14).
Figure 12. SPI/MICROWIRE Serial Interface Timing (CPOL = CPHA = 0)
Figure 13. QSPI Serial Interface Timing (CPOL = 0, CPHA = 1)
DOUT
SCLK
DOUT
SCLK
CS
CS
HIGH-Z
400ksps/300ksps, Single-Supply, Low-Power,
HIGH-Z
Serial 12-Bit ADCs with Internal Reference
1
1
______________________________________________________________________________________
3
D11
DD
FIRST BYTE READ
D11
power supply may affect
D10
D10
D9
D9
D8
D8
D7
D7
8
D6
D6
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 endpoints of the transfer function,
once offset and gain errors have been nullified. The static
linearity parameters for the MAX1284/MAX1285 are mea-
sured using the endpoints method.
Differential nonlinearity (DNL) is the difference between
an actual step width and the ideal value of 1LSB. A DNL
error specification of 1LSB or less guarantees no missing
codes and a monotonic transfer function.
D5
9
D5
D4
D4
D3
SECOND BYTE READ
D3
D2
D2
D1
Differential Nonlinearity
14
D1
Integral Nonlinearity
D0
D0
Definitions
16
HIGH-Z
HIGH-Z
13