Datasheet

MAX11359A
16-Bit Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
63
Maxim Integrated
5) Place a local ground plane on the PCB layer imme-
diately below the crystal guard ring. This helps to
isolate the crystal from noise coupling from signals
on other PCB layers.
Note: The ground plane must be in the vicinity of the
crystal only and not on the entire board.
Parameter Definitions
INL
Integral nonlinearity (INL) is the deviation of the values on
an actual transfer function from a straight line. This
straight line is either a best-straight-line fit or a line drawn
between the end points of the transfer function, once off-
set and gain errors have been nulled. INL for the
MAX11359A is measured using the end-point method.
DNL
Differential nonlinearity (DNL) is the difference between
an actual step width and the ideal value of 1 LSB. A DNL
error specification of greater than -1 LSB guarantees no
missing codes and a monotonic transfer function.
Gain Error
Gain error is the amount of deviation between the mea-
sured full-scale transition point and the ideal full-scale
transition point.
A
V
= 1, 2, 4, 8
A
V
= 1, 1.638, 2
MAX11359A
PGA
MUX
2N3904
16-BIT ADC
C
REF
REF
REF
MUX
TEMP
SENSOR
AIN1
AGND
AIN2
AGND
2N3904
1.25V
REF
Figure 28. Temperature Measurement with Two Remote Sensors
MAX11359A
R
3
R
2
R
2
R
3
R
1
R
1
IN1+
IN1-
SCM1
V
OUT
SCM2
OUT1
SNO1
SNC1
SNO2
SNC2
V
IN+
V
IN-
OUT2
IN2+
IN2-
Figure 29. Programmable-Gain Instrumentation Amplifier