AMC7834 datasheet(28/97 Pages) TI2

28 / 97 page

Resistor String

DAC

output

DAC

Buffer

DAC Trigger

(synchronous

mode)

DAC

Active

Serial Interface DAC Data Register

WRITE

READ

CLAMP MODE

DAC

Output

Range

Configuration

(asynchronous mode)

AGND

AVCC

CLAMP MODE

0x000

AMC7834

SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016

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Alternatively, with the AMC7834 set in closed-loop mode (LOOP-EN bit set to 1 in register 0x10) each bipolar

DAC output updates automatically in response to one of the four current sensors in the device (see the Closed-

Loop Mode section). In closed-loop mode the AMC7834 bipolar DACs operate as four autonomous closed-loop

current controllers.

The DAC upper threshold registers (address 0x4E through 0x4F) sets an upper output limit other than full-scale

for the bipolar DACs when operating in closed-loop mode. The upper threshold feature can be used to limit the

maximum output voltage for each bipolar DAC. When a closed-loop controller attempts to set its bipolar DAC to a

value exceeding the corresponding DAC upper threshold register, the DAC is updated with the threshold code

instead.

7.3.1.1.2

Auxiliary DACs (AUXDAC1, AUXDAC2, AUXDAC3, and AUXDAC4)

The output range for each auxiliary DAC can be independently set through the DAC Range register (address

0x16) to either 0 to 5 V or 2.5 to 7.5 V. The POR and clamp value of each of the auxiliary DACs is fixed to

AGND. The maximum and minimum outputs from these DACs cannot exceed AVCC or be lower than AGND,

respectively. Figure 46 shows a high level block diagram of each auxiliary DAC.

Figure 46. Auxiliary DAC Block Diagram

7.3.1.2 DAC Register Structure

The input data of the DACs is written to the individual DAC data registers (address 0x30 through 0x37) in straight

binary format for all output ranges (see Table 2).

Table 2. DAC Data Format

DIGITAL CODE

DAC OUTPUT VOLTAGE (V)

0 TO 5 V RANGE

2.5 TO 7.5 V RANGE

–4 TO 1 V RANGE

–5 TO 0 V RANGE

0000 0000 0000

2.5

–4

–5

0000 0000 0001

0.00122

2.50122

–3.99878

–4.99878

1000 0000 0000

2.5

–1.5

–2.5

1111 1111 1110

4.99756

7.49756

0.99756

–0.00244

1111 1111 1111

4.99878

7.49878

0.99878

–0.00122

AMC7834 Datasheet(PDF) 28 Page - Texas Instruments

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