WM8170 datasheet(31/41 Pages) WOLFSON

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WM8170

Product Preview Rev 1.0

WOLFSON MICROELECTRONICS LTD

PP Rev 1.0 March 2000

POWER SUPPLIES

This datasheet describes the WM8170 for use in a complete 3.3V system. The performance and

characteristics will differ for the WM8170 if a 5V supply is required. If 5V supplies are required,

contact Wolfson Microelectronics Ltd. for further detailed parametric information.

The WM8170 includes several power supply pins, each of which routes power to particular parts of

the device circuitry. It is important to note the circuit sections of the device, which are connected to

the various supply pins. This is summarised in Table 13.

The WM8170 can operate with all supply pins connected to 5V or with all supply pins connected to

3.3V. It can also operate with all analogue supply pins at 5V and the individual digital supply pins

connected to a combination of 5V and 3.3V.

The set of allowable combinations of supply pin connections is shown in Table 14. All AVDD, CVDD

and DVDD1 pins should be maintained at the same supply voltage. The other supplies can be at any

combination of either 5V or 3.3V.

SUPPLY NAME

CIRCUIT SECTIONS CONNECTED TO

AVDD1

ADC

AVDD2

Main analogue signal path

AVDD3

Reference and bias generator

CVDD

Clock generator circuitry

DVDD1

Internal logic and level shifters

DVDD2

BLCENB, CLPENB, CLPSWB, PBLK, SHD, SHP

DVDD3

PDB, NRESET, SCK/RNW, SEN/STB, PNS, SDI/DNA,

OEB, DCLK, SDO

DVDD4

D0-D9, PTDO

Table 13 Supply Pins Vs Device Circuit Sections Connected

NO.

AVDD1, AVDD2, AVDD3,

CVDD, DVDD1

DVDD2

DVDD3

DVDD4

3.3V

Table 14 Supply Pins vs Supply Voltages – Allowable Combinations

GROUND AND POWER SUPPLY PIN CONNECTIONS

As detailed above, each of the power supply and ground pins of the WM8170 is allocated to a

particular section of the overall device circuitry. It is important that the use of ground and power

planes on any printed circuit board layout should take account of this fact. See Figure 27 for

Recommended Device Decoupling.

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