MAX1167BE Datasheet, PDF (13/30 Pages) Maxim Integrated Products – Multichannel, 16-Bit, 200ksps Analog-to-Digital Converters

Multichannel, 16-Bit, 200ksps Analog-to-Digital
Converters
REFCAP
AV_DD
DV_DD
REF
AGND
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
SCLK
CS
DSEL
DSPR
DIN
REFERENCE
BUFFER
MAX1168
ANALOG-INPUT
MULTIPLEXER
DAC
COMPARATOR
AZ
RAIL
BIAS
ANALOG-SWITCH FINE TIMING
OSCILLATOR
MULTIPLEXER
SUCCESSIVE-APPROXIMATION
REGISTER
OUTPUT
CONTROL
ACCUMULATOR
INPUT REGISTER
MEMORY
DOUT
EOC
DSPX
AGND
DGND
Figure 4. MAX1168 Functional Diagram
The MAX1168 features a 16-bit-wide data-transfer
mode that includes a longer acquisition time (11.5
clock cycles). Longer acquisition times are useful in
applications with input source resistances greater than
1kΩ. Noise increases when using large source resis-
tances. To improve the input signal bandwidth under
AC conditions, drive AIN_ with a wideband buffer
(>10MHz) that can drive the ADC’s input capacitance
and settle quickly.
Input Bandwidth
The ADC’s input-tracking circuitry has a 4MHz small-
signal bandwidth, making possible the digitization of
high-speed transient events and the measurement of
periodic signals with bandwidths exceeding the ADC’s
sampling rate by using undersampling techniques. To
avoid aliasing of unwanted, high-frequency signals into
the frequency band of interest, use anti-alias filtering.
Analog Input Protection
Internal protection diodes, which clamp the analog
input to AV_DD or AGND, allow the input to swing from
(AGND - 0.3V) to (AV_DD + 0.3V) without damaging the
device. If the analog input exceeds 300mV beyond the
supplies, limit the input current to 10mA.
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