MAX1036_09 Datasheet, PDF (10/23 Pages) Maxim Integrated Products – 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel 2-Wire Serial 8-Bit ADCs

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel 2-Wire Serial 8-Bit ADCs
SDA
SCL
INPUT SHIFT REGISTER
V_DD
GND
SETUP REGISTER
CONTROL
LOGIC
INTERNAL
OSCILLATOR
CONFIGURATION REGISTER
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
AIN10
AIN11/REF
ANALOG
INPUT
MUX
T/H
8-BIT
ADC
REF
REFERENCE
4.096V (MAX1038)
2.048V (MAX1039)
Figure 3. MAX1038/MAX1039 Simplified Functional Diagram
OUTPUT SHIFT
REGISTER AND
12-BYTE RAM
MAX1038
MAX1039
ANALOG INPUT MUX
C_T/H
AIN0
AIN1
REF
CAPACITIVE
DAC
AIN2
AIN3/REF
GND
Figure 4. Equivalent Input Circuit
Analog Input Bandwidth
The MAX1036–MAX1039 feature input tracking circuitry
with a 2MHz small signal-bandwidth. The 2MHz input
bandwidth makes it possible to digitize high-speed
transient events and measure periodic signals with
bandwidths exceeding the ADC’s sampling rate by
using undersampling techniques. To avoid high fre-
quency signals being aliased into the frequency band
of interest, anti-alias filtering is recommended.
MAX1036
MAX1037
Analog Input Range and Protection
Internal protection diodes clamp the analog input to
V_DD and GND. These diodes allow the analog inputs to
swing from (GND - 0.3V) to (V_DD + 0.3V) without caus-
ing damage to the device. For accurate conversions,
the inputs must not go more than 50mV below GND or
above V_DD. If the analog input exceeds V_DD by more
than 50mV, the input current should be limited to 2mA.
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