Rainbow-electronics MAX1033 Manual do Utilizador descarregar pdf (Página 22)

Mode Control

The MAX1032/MAX1033 contain one byte-wide mode-

control register. The timing diagram of Figure 15 shows

how to use the mode-control byte, and the mode-con-

trol byte format is shown in Table 7. The mode-control

byte is used to select the conversion method and to

control the power modes of the MAX1032/MAX1033.

Selecting the Conversion Method

The conversion method is selected using the mode-

control byte (see the Mode Control section), and the con-

version is initiated using a conversion-start command

(Table 3, and Figures 2, 3, and 4).The MAX1032/

MAX1033 convert analog signals to digital data using one

of three methods:

• External Clock Mode, Mode 0 (Figure 2)

• Highest maximum throughput (see the Electrical

Characteristics table)

• User controls the sample instant

• CS remains low during the conversion

• User supplies SCLK throughout the ADC con-

version and reads data at DOUT

• External Acquisition Mode, Mode 1 (Figure 3)

• Lowest maximum throughput (see the Electrical

Characteristics table)

• User controls the sample instant

• User supplies two bytes of SCLK, then drives

CS high to relieve processor load while the

ADC converts

• After SSTRB transitions high, the user supplies

two bytes of SCLK and reads data at DOUT

• Internal Clock Mode, Mode 2 (Figure 4)

• High maximum throughput (see the Electrical

Characteristics table)

• The internal clock controls the sampling instant

MAX1032/MAX1033

8-/4-Channel, ±12V Multirange Inputs,

Serial 14-Bit ADCs

22 ______________________________________________________________________________________

1 LSB =

FSR x V

REF

16,384 x 4.096V

BINARY OUTPUT CODE (LSB [hex])

3FFF

3FFE

3FFD

2001

2000

1FFF

0003

0002

0001

0000

FSR

0123 8,192 16,381 16,383

INPUT VOLTAGE (LSB [DECIMAL])

(AGND1)

FSR

Figure 13. Ideal Unipolar Transfer Function, Single-Ended

Input, -FSR to 0

1 LSB =

FSR x V

REF

16,384 x 4.096V

BINARY OUTPUT CODE (LSB [hex])

3FFF

3FFE

3FFD

2001

2000

1FFF

0003

0002

0001

0000

FSR

0123 8,192 16,381 16,383

INPUT VOLTAGE (LSB [DECIMAL])

(AGND1)

FSR

Figure 14. Ideal Unipolar Transfer Function, Single-Ended

Input, 0 to +FSR

1 LSB =

FSR x V

REF

16,384 x 4.096V

BINARY OUTPUT CODE (LSB [hex])

3FFF

3FFE

3FFD

2001

2000

1FFF

0003

0002

0001

0000

FSR

-8,192 -8,190 0 +8,189 +8,191

INPUT VOLTAGE (LSB [DECIMAL])

AGND1 (DIF/SGL = 0)

CH_- (DIF/SGL = 1)

FSR

-1 +1

Figure 12. Ideal Bipolar Transfer Function, Single-Ended or

Differential Input

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 30 31

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