Rainbow-electronics MAX1039 Manual de usuario descargar pdf (Pagina 10)

MAX1036–MAX1039

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.

Analog Input Range and Protection

Internal protection diodes clamp the analog input to

and GND. These diodes allow the analog inputs to

swing from (GND - 0.3V) to (V

+ 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

. If the analog input exceeds V

by more

than 50mV, the input current should be limited to 2mA.

2.7V to 5.5V, Low-Power, 4-/12-Channel

2-Wire Serial 8-Bit ADCs

10 ______________________________________________________________________________________

ANALOG

INPUT

MUX

AIN1

AIN11/REF

AIN2

AIN3

AIN4

AIN5

AIN6

AIN7

AIN8

AIN9

AIN10

AIN0

SCL

SDA

INPUT SHIFT REGISTER

SETUP REGISTER

CONFIGURATION REGISTER

CONTROL

LOGIC

REFERENCE

4.096V (MAX1038)

2.048V (MAX1039)

INTERNAL

OSCILLATOR

OUTPUT SHIFT

12-BYTE RAM

REF

T/H

8-BIT

ADC

GND

MAX1038

MAX1039

Figure 3. MAX1038/MAX1039 Simplified Functional Diagram

TRACK

HOLD

T/H

TRACK

HOLD

DIFFERENTIAL

SINGLE ENDED

AIN0

AIN1

AIN2

AIN3/REF

GND

ANALOG INPUT MUX

CAPACITIVE

DAC

REF

MAX1036

MAX1037

Figure 4. Equivalent Input Circuit

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 21 22

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Rainbow-electronics MAX1039 Manual de usuario Pagina 10

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