Rainbow-electronics MAX1303 Bedienungsanleitung PDF herunterladen (Seite 15)

As a result, the analog input impedance is relatively

constant over the input voltage as shown in Figure 5.

Single-ended conversions are internally referenced to

AGND1 (Tables 3 and 4). In differential mode, IN+ and

IN- are selected according to Tables 3 and 5. When con-

figuring differential channels, the differential pair follows

the analog configuration byte for the positive channel.

For example, to configure CH2 and CH3 for a ±V

REF

dif-

ferential conversion, set the CH2 analog configuration

byte for a differential conversion with the ±V

REF

range

(1010 1100). To initiate a conversion for the CH2 and

CH3 differential pair, issue the command 1010 0000.

Analog Input Bandwidth

The MAX1302/MAX1303 input-tracking circuitry has a

1.5MHz small-signal bandwidth. The 1.5MHz input band-

width makes it possible to digitize high-speed transient

events. Harmonic distortion increases when digitizing

signal frequencies above 15kHz as shown in the THD, -

SFDR vs. Analog Input Frequency plot in the Typical

Operating Characteristics.

Analog Input Range and Fault Tolerance

Figure 7 illustrates the software-selectable single-

ended analog input voltage range that produces a valid

digital output. Each analog input channel can be inde-

pendently programmed to one of seven single-ended

input ranges by setting the R[2:0] control bits with

DIF/SGL = 0.

MAX1302/MAX1303

8-/4-Channel, ±V

REF

Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 15

SCLK

DIN S C2 C1 C0 0 0 0 0

ANALOG INPUT

TRACK AND HOLD*

DOUT

B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

BYTE 1 BYTE 2 BYTE 3 BYTE 4

SSTRB

HOLD TRACK HOLD

HIGH

IMPEDANCE

ACQ

HIGH

IMPEDANCE

*TRACK AND HOLD TIMING IS CONTROLLED BY SCLK.

SAMPLE

≈ f

SCLK

/ 32

SAMPLING INSTANT

Figure 2. External Clock-Mode Conversion (Mode 0)

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 30 31

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