AD4056BCPZ-R2 datasheet(29/67 Pages) AD

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Data Sheet

AD4050/AD4056

MODES OF OPERATION

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Rev. A | 29 of 67

Table 16 shows an overview of the AD4050/AD4056 functional

modes. The ADC and serial interface functionality for each mode is

given in the subsequent sections.

Configuration mode is the default AD4050/AD4056 operating mode

following power-up and device resets. The remaining operating

modes are selected via the configuration registers as shown in Ta-

ble 16. The SPI protocol for register writes and reads is described

in the Configuration Mode section.

Figure 45 shows the AD4050/AD4056 operating mode selection

as a state machine diagram. The ENTER_ADC_MODE bit field

controls whether the AD4050/AD4056 is in configuration mode

or in one of the five ADC modes as shown in Table 16. Con-

figure the ADC_MODE and AUTO_MODE fields before setting

ENTER_ADC_MODE to 1'b1 to select the desired operating mode.

Setting the ENTER_ADC_MODE to 1'b1 via a register write triggers

the AD4050/AD4056 to transition from configuration mode to the

selected ADC mode (see Figure 43).

The exit command triggers the AD4050/AD4056 to transition from

the active ADC mode back to configuration mode. When the

AD4050/AD4056 receives the exit command, it internally resets

the ENTER_ADC_MODE bit to 1'b0. The exit command consists of

the code 5'b10101 clocked in on the SDI pin on the first 5 SCLK

rising edges following the CS falling edge. Figure 44 shows a timing

diagram for the exit command. The tCONFIG specification indicates

the minimum delay between the exit command CS rising edge and

when the AD4050/AD4056 can receive new register read and write

SPI transactions (see Table 5 and Table 6).

Table 16. AD4050/AD4056 Functional Modes

Mode

ENTER_ADC_MODE

ADC_MODE

AUTO_MODE

POWER_MODE

Configuration Mode (Default)

1'b0

Don't Care

Don't care

2'b00

Sample Mode

1'b1

2'b00

Don't care

2'b00

Burst Averaging Mode

1'b1

2'b01

Don't care

2'b00

Averaging Mode

1'b1

2'b10

Don't care

2'b00

Monitor Mode

1'b1

2'b11

1'b0

2'b00

Trigger Mode

1'b1

2'b11

1'b1

2'b00

Sleep Mode

Don't care

2'b11

Figure 43. ENTER_ADC_MODE Timing Diagram

Figure 44. Exit Command Timing Diagram

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