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Digital Voice Systems AMBE-3000 Specifications Page 31

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AMBE-3000™ Vocoder Chip Users Manual
Version 2.8, August, 2011
Electrical Characteristics and
Requirements
ope
rational sections of the data sheet. Exposure to Absolute Maximum Ratings for extended periods can adversely affect
device reliability.
Absolute Maximum Ratings
3v3 Supply voltage range -0.3 V to 4.6 V
1v8 Supply voltage range -0.5 V to 2.5 V
Input voltage range,V
IN
-0.3 V to 4.6 V
Output voltage range, V
O
-0.3 V to 4.6 V
Input clamp current I
IK
(V
IN
< 0 or V
IN
> 3v3)† ± 20 mA
Output clamp current I
OK
(V
O
< 0 or V
O
> 3v3) ± 20 mA
Table 5 Absolute Maximum Ratings
†Continuous clamp current per pin is ± 2 mA
3.4 Thermal Resistance Characteristics
Thermal Resistance Characteristics
Package Type
Parameter
TQFP BGA
Unit
PsiJT 0.271 0.658
C/W
Θ
JA
41.65 42.57
C/W
Θ
JC
10.76 16.08
C/W
Table 6 Thermal Resistance Characteristics
Unless otherwise noted, the list of absolute maximum ratings is specified over operating temperature ranges. All voltage values
are with respect to Vss.
3.5 Power Sequencing Requirements
The AMBE-3000™ Vocoder Chip silicon requires dual voltages (1.8-V and 3.3-V) to power up the CPU, Flash, ROM, ADC,
and the I/Os. To ensure the correct reset state for all modules during power up, there are some requirements to be met while
powering up/powering down the device.
Enable power to all 3.3-V supply pins and then ramp 1.8 V supply pins (Table 7 Voltage Supply Pins). Other than the power
sup
ply pins, no pin should be driven before the 3.3-V rail has been fully powered up.
Voltage Supply Pins
Package Type
TQFP BGA
3.3 V Supply Pins 1, 13, 14, 25, 49, 83, 104, 118 B2, E1, F4, E9, G11, J4, L7, A5, L10, N14
1.8 V Supply Pins 20, 29, 42, 56, 63, 74, 82, 94, 102, 110, 114
B10, C8, C14, G12, H1, K12, L1, P5, P9,
P12, A6
Table 7 Voltage Supply Pins
(Subject to Change) Page 21
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