ADL5309ACBZ-R7 datasheet(18/25 Pages) AD

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Data Sheet

ADL5309

APPLICATIONS INFORMATION

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Rev. A | 18 of 25

As an example, applying a 2.000 V reference voltage will result in

an ideal ADC value of 14894. By applying a correction value of AD-

CREF_value_ideal/ADCREF_value for every current measurement

and multiplying this with the measured ADC value of the input

current by setting ADC_MUX_CTRL (0x04) = 0x02 for Channel 1

and ADC_MUX_CTRL (0x04) = 0x04 for Channel 2. A scaled ADC

measurement result, as seen in Figure 6 and Figure 9, improves

accuracy.

Figure 47. ADCREF Interface

SDA, SCL, AND SBA INTERFACES

Figure 48 shows the bidirectional SDA interface. The SDA output

driver is open drain and requires an off-chip pull-up resistor at

the receiver. The pull-up resistor can be connected to a maximum

positive supply of 5.5 V. During a register write operation, the SDA

output driver is high impedance, and the SDA input receiver should

be driven by a driver capable of driving the input pin capacitance

of 0.8 pF at the 200 kHz maximum SDA frequency. A driver output

impedance less than 20 kΩ is recommended.

Figure 48. Simplified SDA Interface

Figure 49 shows the SCL interface for the serial clock input to the

I2C controller. This input is high impedance and should be driven by

a driver capable of driving the input pin capacitance of 0.8 pF at the

400 kHz maximum SCL frequency. A driver output impedance less

than 10 kΩ is recommended.

Figure 49. Simplified SCL Interface

Figure 50 shows the SBA Interface A voltage source applied to SCL

sets the I2C bus device address to one of three possible settings.

These settings include connecting the pin to VCC for a device

address of 0x6E, leaving the pin floating for a device address of

0x6D, or connecting the pin to ground for a device address of 0x6C.

A source impedance of 10 kΩ or less is recommended for this pin.

Figure 50. Simplified SBA Interface

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