MAX1162_10 Datasheet, PDF (17/18 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:
Functional Diagram
• Apply AGND before DGND.
• Apply AIN and REF after AV_DD and AGND
are present.
AV_DD
DV_DD
• DV_DD is independent of the supply sequencing.
REF
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
AIN
AGND
TRACK AND
HOLD
16-BIT SAR
ADC
OUTPUT
BUFFER
DOUT
voltage of about 250µV, 4LSB error with a +4V full-
scale system.
SCLK
CONTROL
The board layout should ensure that digital and analog
signal lines are kept separate. Do not run analog and
CS
digital (especially the SCLK and DOUT) lines parallel to
one another. If one must cross another, do so at right
angles.
MAX1162
The ADCs high-speed comparator is sensitive to high-
DGND
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.
PROCESS: BiCMOS
Chip Information
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in
the package code indicates RoHS status only. Package draw-
ings may show a different suffix character, but the drawing per-
tains to the package regardless of RoHS status.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
10 µMAX
U10-2
21-0061
______________________________________________________________________________________ 17