MAX1167BEEE datasheet(13/30 Pages) MAXIM

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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

Ω. 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 AVDD or AGND, allow the input to swing from

(AGND - 0.3V) to (AVDD + 0.3V) without damaging the

device. If the analog input exceeds 300mV beyond the

supplies, limit the input current to 10mA.

Multichannel, 16-Bit, 200ksps Analog-to-Digital

Converters

______________________________________________________________________________________

REFERENCE

REF

REFCAP

AVDD

DVDD

AGND

DGND

AIN0

AIN1

AIN2

AIN3

SCLK

DIN

ANALOG-INPUT

MULTIPLEXER

CONTROL

ACCUMULATOR

MEMORY

INPUT REGISTER

BIAS

OSCILLATOR

OUTPUT

DOUT

EOC

ANALOG-SWITCH FINE TIMING

SUCCESSIVE-APPROXIMATION

MAX1168

DAC

BUFFER

AIN4

AIN5

AIN6

AIN7

RAIL

COMPARATOR

DSPX

DSEL

DSPR

Figure 4. MAX1168 Functional Diagram

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