X9470 Datasheet, PDF (9/24 Pages) Xicor Inc. – RF Power Amplifier (PA) Bias Controller

X9470
Power-up Timing
Symbol
t_r V_CC(10)
Parameter
V_CC Power-up rate
Min.
0.2
Max.
50
Unit
V/ms
Note:
Delays are measured from the time V_CC is stable until the specified operation can be initiated. These parameters are not 100% tested.
Proper recall of stored wiper setting requires a V_CC power-up ramp that is monotonic and with noise or glitches < 100mV. It is important to
correctly sequence voltages in an LDMOS amplifier circuit. For the X9470 typical application, the V_CC, then V+ pins should be powered
before the V_DD of the LDMOS to prevent LDMOS damage. Under no circumstances should the V_DD be applied to the LDMOS device
before V_CC and V+ are applied to the X9470.
DCP Default Power-up Tap Positions (shipped from factory)
VREF DCP
0
Bias Adjust DCP
0
Nonvolatile Write Cycle Timing
Symbol
t_WC(10)
Parameter
Write Cycle Time
Min.
Typ.⁽¹⁾
5
Max.
10
Unit
ms
Note: t_WC is the time from a valid stop condition at the end of a write sequence to the end of the self-timed internal nonvolatile write cycle. It is the
minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used.
9
FN8204.0
March 8, 2005