MAX1162 Datasheet, PDF (16/17 Pages) Maxim Integrated Products – 16-Bit, +5V, 200ksps ADC with 10μA Shutdown

16-Bit, +5V, 200ksps ADC with 10µA Shutdown
Constraints on sequencing the power supplies and
inputs are as follows:
• Apply AGND before DGND.
• Apply AIN and REF after AV_DD and AGND
are present.
• DV_DD is independent of the supply sequencing.
Ensure that digital return currents do not pass through
the analog ground and that return-current paths are low
impedance. A 5mA current flowing through a PC board
ground trace impedance of only 0.05Ω creates an error
voltage of about 250µV, 4LSB error with a +4V full-
scale system.
The board layout should ensure that digital and analog
signal lines are kept separate. Do not run analog and
digital (especially the SCLK and DOUT) lines parallel to
one another. If one must cross another, do so at right
angles.
The ADCs high-speed comparator is sensitive to high-
frequency noise on the AV_DD power supply. Bypass an
excessively noisy supply to the analog ground plane
with a 0.1µF capacitor in parallel with a 1µF to 10µF
low-ESR capacitor. Keep capacitor leads short for best
supply-noise rejection.
Functional Diagram
AV_DD
DV_DD
REF
AIN
AGND
SCLK
CS
TRACK AND
HOLD
16-BIT SAR
ADC
OUTPUT
BUFFER
CONTROL
MAX1162
DOUT
DGND
Chip Information
TRANSISTOR COUNT: 12,100
PROCESS: BiCMOS
16 ______________________________________________________________________________________