AMC7836IPAPRG4 datasheet(26/91 Pages) TI2

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Amplifier

AMC7836

SLAS986D – NOVEMBER 2014 – REVISED FEBRUARY 2018

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7.3 Feature Description

7.3.1 Digital-to-Analog Converters (DACs)

The AMC7836 device features an analog-control system centered on sixteen 12-bit DACs that operate from the

internal reference of the device. Each DAC core consists of a string DAC and output-voltage buffer.

The resistor-string structure consists of a series of resistors, each with a value of R. The code loaded to the DAC

determines at which node on the string the voltage is tapped off to be fed into the output amplifier. The voltage is

tapped off by closing one of the switches connecting the string to the amplifier (see Figure 48). This architecture

has inherent monotonicity, voltage output, and low glitch. This architecture is also linear because all the resistors

are of equal value.

Figure 48. DAC Resistor String

7.3.1.1 DAC Output Range and Clamp Configuration

The 16 DACs are split into four groups, each with four DACs. All of the DACs in a given group share the same

output range and clamp voltage value, however, these settings can be set independently for each DAC group.

After power-on or a reset event the following actions take place: the DAC outputs are directed automatically to

the corresponding clamp value; the DAC groups output ranges are set by the auto-range detector and; all DAC

data registers and data latches are set to the default values. Figure 49 shows a high level block diagram of each

DAC in the AMC7836 device.

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