Rainbow Electronics MAX1089 User Manual

Page 9

MAX1086–MAX1089

150ksps, 10-Bit, 2-Channel Single-Ended, and

1-Channel True-Differential ADCs in SOT23

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Analog Input Protection

Internal protection diodes which clamp the analog input
to V

and GND allow the analog input pins to swing

from GND - 0.3V to V

+ 0.3V without damage. Both

inputs must not exceed V

by more than 50mV or be

lower than GND by more than 50mV for accurate conver-
sions. If an off-channel analog input voltage exceeds
the supplies, limit the input current to 2mA.

Internal Clock

The MAX1086–MAX1089 operate from an internal oscilla-
tor, which is accurate within 10% of the 4MHz specified
clock rate. This results in a worse case conversion time
of 3.7µs. The internal clock releases the system micro-
processor from running the SAR conversion clock and
allows the conversion results to be read back at the
processor’s convenience, at any clock rate from 0 to
8MHz.

CNVST

SCLK

DOUT

ACQ

CONV

SAMPLING INSTANT

MSB

LSB

HIGH-Z