MAX1086_07 Datasheet, PDF (9/17 Pages) Maxim Integrated Products – 150ksps, 10-Bit, 2-Channel Single-Ended, and 1-Channel True-Differential ADCs in SOT23

150ksps, 10-Bit, 2-Channel Single-Ended, and
1-Channel True-Differential ADCs in SOT23
CNVST
t_CONV
t_ACQ
SCLK
1
4
8
12
DOUT
HIGH-Z
B9
MSB
B8
B7
B6 B5
B4
B3
B2
B1
B0
LSB
S1
S0
HIGH-Z
SAMPLING INSTANT
Figure 5a. Single Conversion AIN1 vs. GND (MAX1086/MAX1087), unipolar mode AIN+ vs. AIN- (MAX1088/MAX1089)
CNVST
t_CONV
t_ACQ
SCLK
1
4
8
12
DOUT
HIGH-Z
B9
MSB
B8
B7
B6 B5
B4
B3
B2
B1
B0
LSB
S1
S0
HIGH-Z
SAMPLING INSTANT
Figure 5b. Single Conversion AIN2 vs. GND (MAX1086/MAX1087), bipolar mode AIN+ vs. AIN- (MAX1088/MAX1089)
Analog Input Protection
Internal protection diodes which clamp the analog input
to V_DD and GND allow the analog input pins to swing
from GND - 0.3V to V_DD + 0.3V without damage. Both
inputs must not exceed V_DD 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.
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