MAX1117 Datasheet, PDF (13/14 Pages) Maxim Integrated Products – Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs

Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
Functional Diagrams
SCLK
CNVST
CH0
INPUT
INPUT
MULTIPLEXER
TRACK
AND HOLD
CH1
CONTROL
V_DD
LOGIC AND
INTERNAL
OCSILLATOR
GND
8-BIT
OUTPUT
SAR
SHIFT
OUT
ADC
REGISTER
INTERNAL
REFERENCE
+2.096V
OR +4.096V
MAX1117
MAX1119
should be low impedance and as short as possible for
noise-free operation.
High-frequency noise in the V_DD power supply may
affect the comparator in the ADC. Bypass the supply to
the star ground with a 0.1µF capacitor close to the V_DD
pin of the MAX1117/MAX1118/MAX1119. Minimize
capacitor lead lengths for best supply-noise rejection. If
the power supply is noisy, a 1µF capacitor in conjunc-
tion with a 10Ω series resistor can be connected to
form a lowpass filter.
Chip Information
TRANSISTOR COUNT: 2000
PROCESS: BiCMOS
______________________________________________________________________________________ 13