AMC7832IPAPR.A datasheet(59/74 Pages) TI2

59 / 74 page

AMC7832

www.ti.com

SLAS836 – MARCH 2014

10 Power Supply Recommendations

The preferred (not required) order for applying power is IOVDD, DVDD/AVDD and then AVCC/AVEE. When power

sequencing, ensure that all digital terminals are not powered, or in an active state while IOVDD ramps. This can

be accomplished by attaching 10-k

Ω pull-up resistors to IOVDD, or pull-down resistors to DGND.

The supply voltage ranges are specified in the Recommended Operating Conditions but are repeated here for

convenience.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE RANGE

AVDD

4.5

5.5

DVDD

DVDD must be equal to AVDD

4.5

5.5

IOVDD

IOVDD must be equal or less than DVDD

1.8

5.5

AVCC

4.5

12.5

AVEE

–12.5

–12

AVSSA,B,C,D

AVEE

OPERATING RANGE

Specified temperature

–40

105

°C

range

All registers initialize to the default values after these supplies have been established. Communication with the

AMC7832 will be valid after a 250-µS maximum power-on reset delay. The default state of all analog blocks is off

as determined by the power-down registers (0xB2 and 0xB3). Before writing to this register, a hardware reset

should be issued to ensure specified operation of the AMC7832. Communication to the AMC7832 will be valid

after a maximum 250-µS reset delay from the rising edge of RESET.

If DVDD falls below +4.5-V, the minimum supply value of DVDD, either a hardware or power-on reset should be

issued before proper operation can be resumed.

When powered on, the internal POR circuit invokes a power-on reset, which performs the equivalent function of

the RESET terminal. To ensure a POR, DVDD must start from a level below 750-mV.

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