MAX1200 Datasheet, PDF (13/16 Pages) Maxim Integrated Products – +5v sINGLE-sUPPLY, 1mSPS, 16-bIT sELF-cALIBRATING adc

+5V Single-Supply, 1Msps, 16-Bit
Self-Calibrating ADC
The MAX1200 has three power-supply inputs: analog
V_DD (AV_DD), digital V_DD (DV_DD), and drive V_DD
(DRV_DD). Each AVDD input should be decoupled with
parallel ceramic chip capacitors of values 0.1µF and
0.001µF, with these capacitors as close to the pin as
possible and with the shortest possible connection to
the ground plane. The DV_DD pins should also have
separate 0.1µF capacitors again adjacent to their
respective pins, as should the DRV_DD pin. Minimize the
digital load capacitance. However, if the total load
capacitance on each digital output exceeds 20pF, the
DRV_DD decoupling capacitor should be increased or,
preferably, digital buffers should be added.
The power-supply voltages should also be decoupled
with large tantalum or electrolytic capacitors at the
point they enter the PCB. Ferrite beads with additional
decoupling capacitors forming a pi network may
improve performance.
The analog power-supply input (AV_DD) for the
MAX1200 is typically +5V while the digital supplies can
vary from +3V to +5V. Usually, DV_DD and DRV_DD pins
are connected to the same power supply. Note that the
DV_DD supply voltage must be greater than or equal to
the DRV_DD voltage. For example, a digital +3.3V sup-
ply could be connected to DRV_DD while a cleaner +5V
supply is connected to DV_DD, resulting in slightly
improved performance. Alternatively, the +3.3V supply
could be connected to both DRV_DD and DV_DD.
However, the +3.3V supply must not be connected to
DV_DD while the +5V supply is connected to DRV_DD
(Table 2).
Table 2. Power-Supply Voltage
Combinations
AV_DD
(V)
DV_DD
(V)
DRV_DD
(V)
ALLOWED/
NOT ALLOWED
+5
+5
+5
Allowed
+5
+5
+3.3
Allowed
+5
+3.3
+3.3
Allowed
+5
+3.3
+5
Not
Allowed
Chip Information
TRANSISTOR COUNT: 56,577
SUBSTRATE CONNECTED TO AGND
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