MAX1068 Maxim Integrated Products, MAX1068 Datasheet - Page 13

• Manufacturer Part Number: MAX1068
• Description: (MAX1067 / MAX1068) 200ksps Analog-to-Digital Converters
• Manufacturer: Maxim Integrated Products

www.DataSheet4U.com
that includes a longer acquisition time (11.5 clock
cycles). Longer acquisition times are useful in applica-
tions with input source resistances greater than 1kΩ.
Noise increases when using large source resistances. 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.
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
Figure 4. MAX1068 Functional Diagram
Multichannel, 14-Bit, 200ksps Analog-to-Digital
______________________________________________________________________________________
AGND
DSPR
SCLK
DSEL
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
REF
DIN
CS
OSCILLATOR
ANALOG-INPUT
MULTIPLEXER
REFERENCE
Input Bandwidth
AGND
BIAS
MULTIPLEXER
REFCAP
INPUT REGISTER
RAIL
AZ
CONTROL
BUFFER
DGND
SUCCESSIVE-APPROXIMATION
DAC
ANALOG-SWITCH FINE TIMING
AV
REGISTER
DD
avoid aliasing of unwanted, high-frequency signals into
the frequency band of interest, use anti-alias filtering.
Internal protection diodes, which clamp the analog
input to AV
(AGND - 0.3V) to (AV
device. If the analog input exceeds 300mV beyond the
supplies, limit the input current to 10mA.
COMPARATOR
MAX1068
ACCUMULATOR
DD
MEMORY
DV
DD
or AGND, allow the input to swing from
OUTPUT
DD
+ 0.3V) without damaging the
Converters
Analog Input Protection
DOUT
EOC
DSPX
13