Data Sheet

ADG6412

APPLICATIONS INFORMATION

analog.com

Rev. 0 | 17 of 18

LARGE VOLTAGE, HIGH FREQUENCY SIGNAL

TRACKING

Figure 23 shows the voltage range and corresponding frequen-

cies that the ADG6412 can reliably convey. The tracking voltage

(VTRACK) in the figure shows the source voltage and the drain volt-

age difference, which is less than 50 mV for a given amplitude and

frequency. For large voltage, high frequency signals, the frequency

must be kept below 10 MHz. If the required frequency is greater

than 10 MHz, decrease the signal range appropriately to ensure

signal integrity.

POWER SUPPLY RECOMMENDATIONS

Analog Devices has a wide range of power management products

to meet the requirements of high performance signal chains.

An example of a bipolar power solution is shown in Figure 34.

The LT3463 (a dual switching regulator) generates a positive and

negative supply rail for the ADG6412, an amplifier, and/or a preci-

sion converter in a typical signal chain. Also, two optional low-drop-

out regulators (LDOs), the ADP7142 and ADP7182 (positive and

negative LDOs, respectively) are shown in Figure 34, which can

reduce the output ripple of the LT3463 in ultra-low noise sensitive

applications.

Figure 34. Bipolar Power Solution

Table 13. Recommended Power Management Devices

Product

Description

LT3463

Dual micropower, DC to DC converter with Schottky diodes

ADP7142

40 V, 200 mA, low noise, CMOS, LDO linear regulator

ADP7182

−28 V, −200 mA, low noise, LDO linear regulator

HIGH-CURRENT DRIVE AND PRECISION

CURRENT-SENSE

Figure 35 shows an example application for the ADG6412. In

automated test equipment (ATE) and instrumentation applications,

when driving a current to a device under test (DUT), there is a

requirement to have multiple sense resistors for multiple current

ranges to facilitate large current output ranges from micro amps to

amps. The low on-resistance of the ADG6412 is ideally suited to

switching the force current output path in this application because

it allows for high continuous current carrying as seen in Table 4 to

Table 7.

Figure 35. High-Current Drive and Precision Current-Sense Application

DIGITAL AUDIO CHANNEL TO ULTRA-LOW

THD

Figure 36 shows an example application for the ADG6412. For

precision audio signal chains, THD is a key specification. The THD

performance of a switch is related to the on-resistance flatness,

and the ADG6412 has exceptionally low on-resistance flatness of

approximately 3 mΩ. Here, the ADG6412 is set up as a gain

selection switch for an audio preamplifier to allow flexibility for

user to select multiple gain ranges. The THD performance of the

ADG6412 maximizes the signal fidelity and the low on-resistance

minimizes any gain error in the system.

Figure 36. Digital Audio Channel to Ultra-Low THD Application