ADIS16505-2SLASHPCBZ datasheet(39/41 Pages) AD

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Data Sheet

ADIS16505

Rev. C | Page 39 of 41

POWER SUPPLY CONSIDERATIONS

The ADIS16505 contains 6 μF of decoupling capacitance across

the VDD and GND pins. When the VDD voltage rises from 0 V

to 3.3 V, the charging current for this capacitor bank imposes

the following current profile (in amperes):



dVDD





6

where:

IDD(t) is the current demand on the VDD pin during the initial

power supply ramp, with respect to time.

C is the internal capacitance across the VDD and GND pins (6 μF).

VDD(t) is the voltage on the VDD pin, with respect to time.

For example, if VDD follows a linear ramp from 0 V to 3.3 V,

in 66 μs, the charging current is 300 mA for that timeframe.

The ADIS16505 also contains embedded processing functions

that present transient current demands during initialization or

reset recovery operations. During these processes, the peak

current demand reaches 250 mA and occurs at a time that is

approximately 40 ms after VDD reaches 3.0 V (or ~40 ms

after initiating a reset sequence).

EVALUATION TOOLS

Breakout Boards

The ADIS16505 has three difference breakout boards, which

provide a simple way to connect an ADIS16505 model and an

existing embedded processor platform. Table 133 provides a list

of the model numbers for each breakout board, along with the

ADIS16505 model that is on each breakout board. Figure 63

shows the ADIS16505-2 which is identical to the ADIS16505-1

and ADIS16505-3 boards.

Figure 63. ADIS16505-2 Breakout Board

Table 133. Breakout Board Models

Breakout Board Model

ADIS16505 Model

ADIS16505-1/PCBZ

ADIS16505-1BMLZ

ADIS16505-2/PCBZ

ADIS16505-2BMLZ

ADIS16505-3/PCBZ

ADIS16505-3BMLZ

The electrical interface (J1) on each breakout board comes from

a dual row, 2 mm pitch, 16-pin interface, which supports standard

ribbon cabling (1 mm pitch). Table 134 provides the J1 pin

assignments, which support direct connection with an

embedded processor board using standard ribbon cables.

Although each case may present its own set of sensitivities

(such as electromagnetic interference (EMI)), these boards can

typically support reliable communication over ribbon cables up

to 20 cm in length.

Table 134. J1 Pin Assignments, Breakout Board

J1 Pin Number

Signal

Function

RST

Reset

SCLK

SPI

DOUT

SPI

No connect

DIN

SPI

GND

Ground

GND

Ground

GND

Ground

VDD

Power, 3.3 V

VDD

Power, 3.3 V

VDD

Power, 3.3 V

Data ready

SYNC

Input clock

No connect

Figure 64 provides a top view of the breakout board, including

dimensional locations for all the key mechanical features, such as

the mounting holes and the 16-pin header. Figure 65 provides an

electrical schematic for this breakout board. For additional

information, refer to the ADIS1650x-x/PCBZ Breakout Board

Wiki Guide.

PC-Based Evaluation, EVAL-ADIS2

In addition to supporting quick prototype connections between

the ADIS16505 and an embedded processing system, J1 on the

breakout boards also connects directly to J1 on the EVAL-ADIS2

evaluation system. When used in conjunction with the IMU

Evaluation Software for the EVAL-ADISX Platforms, the

EVAL-ADIS2 provides a simple, functional test platform that

allows users to configure and collect data from the ADIS16505

IMUs.

ADIS16505-2/PCBZ Datasheet(PDF) 39 Page - Analog Devices

ADIS16505-2/PCBZ Datasheet(HTML) 39 Page - Analog Devices

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