Digital Voice Systems AMBE-3000 Specifikace stáhnout pdf (Strana 35)

AMBE-3000F™ Vocoder Chip Users Manual

Version 3.4, April, 2014

Electrical Characteristics and

Requirements

Figure 13 Input Levels

Input levels are as follows 0.8 V (V

) and 2.0 V (V

)

Input transition times are specified as follows:

 For a high-to-low transition on an input signal, the level at which the input is said to be no longer high is below

IH(Min)

and the level at which the input is said to be low is V

IL(Max)

and lower.

 For a low-to-high transition on an input signal, the level at which the input is said to be no longer low is above

IL(Max)

and the level at which the input is said to be high is V

IH(Min)

and higher.

3.8 Power-Down Sequencing:

During power-down, the device reset should be asserted low (8 μs, minimum) before the 1.8 V supply reaches 1.5 V. This will

help to keep on-chip flash logic in reset prior to the 3v3and 1.8 V power supplies ramping down. It is recommended that the

device reset control from “Low-Dropout (LDO)” regulators or voltage supervisors be used to meet this constraint. LDO

regulators that facilitate power-sequencing (with the aid of additional external components) may be used to meet the power

sequencing requirement.

3.9 Low Power Modes

The AMBE-3000F™ Vocoder Chip has four power states as shown in Figure 14 AMBE-3000F™ Vocoder Chip Power States.

Figure 14 AMBE-3000F™ Vocoder Chip Power States

(Subject to Change) Page 25

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Digital Voice Systems AMBE-3000 Specifikace Strana 35