ADGM3144BCCZ-R2 datasheet(23/30 Pages) AD

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Data Sheet

ADGM3144

APPLICATIONS INFORMATION

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Rev. 0 | 23 of 30

POWER SUPPLY RAILS

The ADGM3144 can operate with unipolar supplies between 3.0V

and 3.6V. The device is fully specified at a 3.3V analog supply

voltage.

POWER SUPPLY RECOMMENDATIONS

Analog Devices, Inc., has a wide range of power management

products to meet the requirements of most high performance signal

chains.

Figure 63 shows an example of a unipolar solution for the

ADGM3144. The ADP7142 is a low dropout linear regulator that

operates from 2.7V to 40V and is ideal for the regulation of high

performance analog and mixed-signal circuits operating from 39V

down to 1.2V rails. The ADP7142 has 11µV rms output noise

independent of the output voltage. The ADP7142 can be used to

power the supply rail for the ADGM3144, a microcontroller, and/or

other devices in the signal chain.

Figure 63. Unipolar Power Solution

If low noise performance at the power supply is required, the

ADP7142 can be replaced by the LT1962 or LT3045-1.

Table 8. Recommended Power Management Devices

Product

Description

ADP7142

40V, 200mA, low noise, CMOS low dropout (LDO) linear regula-

tor

LT1962

300mA, low noise, micropower, LDO regulator

LT3045-1

20V, 500mA, ultra-low noise, ultra-high power supply rejection

ratio (PSRR) linear regulator with voltage for input to output

control (VIOC)

HIGH-SPEED DIGITAL LOOPBACK

Testing high-speed input and output (HSIO) interfaces, such as

peripheral component interconnect express (PCIe) Gen 4.0 and

PCIe Gen 5.0, in a high volume manufacturing environment is a

challenge. A common approach to validate an HSIO interface is

the implementation of a high-speed loopback test method. This in-

corporates both high-speed and DC test paths in one configuration.

To perform high-speed loopback testing, generally a pseudorandom

bit sequence (PRBS) is transmitted at high speed from the transmit-

ter and received at the receiver end after being looped back on

the load board or test board. At the receiver end, the sequence is

analyzed to calculate the bit error rate (BER).

DC parametric tests are performed on the input and output pins,

such as a continuity test and a leakage test, to ensure device

functionality. To perform these tests, the input/output pins of the

DUT must be connected directly to a DC instrument where the DC

measurement of the input/output pin is executed.

The ADGM3144 offers both high speed digital and DC testing

capability with superior density in a small 3mm × 3mm × 1.5mm

LGA package, as shown in Figure 64. The MEMS switch also

enables communication from the tester to the device under test

(DUT). The ADGM3144 provides excellent performance from DC to

16GHz, which allows the switch to handle both high-speed signals

up to 64Gbps and precision DC signals.

Figure 64. ADGM3144 Enabling Both High-Speed Digital and DC Testing

SWITCHABLE RF ATTENUATOR

It is common to see RF attenuator networks used in RF instru-

mentation equipment, such as vector network analyzers, spectrum

analyzers, and signal generators. Routing RF signals through an at-

tenuator enables the equipment to accept higher power signals and

increase the dynamic range of the instrument. In RF attenuation ap-

plications, such as vector network analyzers, spectrum analyzers,

and signal generators, maintaining the bandwidth of the signal after

it passes through the network is critical. Any degradation of the

signal reduces the performance of the equipment. Therefore, the

RF characteristics of the switches used for routing are integral to

the quality of an attenuator network.

The ADGM3144 MEMS switch is suited for use as a switchable RF

attenuator due to its low flat insertion loss, wide RF bandwidth, and

high reliability. The ADGM3144, as an SP4T switch, also provides

added flexibility. Figure 65 shows an example of an attenuation

network configuration using two ADGM3144 switches and three

different attenuators. The fourth channel of the switches is used as

a nonattenuated route.

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