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ACE9020NP1T Datasheet(PDF) 5 Page - Zarlink Semiconductor Inc |
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ACE9020NP1T Datasheet(HTML) 5 Page - Zarlink Semiconductor Inc |
5 / 6 page 4 ACE9020 Power Control Circuits The inputs PD1 and PD2 are used to select the operating modes as shown below: PD1 PD2 Mode 0 0 Sleep All circuits off 1 0 Standby Prescaler On 1 1 Transmit Set Up Prescaler, VHF oscillator on. Upconverter off 0 1 Duplex All circuits on The power down inputs (PD1, PD2) are compatible with ACE9030 digital outputs (DO5, 6, 7). These modes allow circuit operation and power consumption to be optimised. The ACE9020 can be put in sleep mode (0, 0) when the power consumption is minimal. The standby mode (1, 0) is used when the phone is in standby (receive only). The prescaler is operational to maintain the main UHF PLL; all circuitry associated with transmit functions is turned off. There is an intermediate transmit set up state (1, 1). This allows the VHF oscillator and phase locked loop to stabilise before enabling the upconverter, preventing spurious transmissions. The time required for this state will be determined primarily by the VHF PLL settling time. The power down inputs can then be set to (0, 1) the full duplex condition. The intermediate state should also be used during a ‘handoff’ during conversation on an analogue cellular phone, the VHF PLL continuing to operate while the main UHF PLL changes channel, the transmit output being disabled. It is also recommended that the intermediate state is used when going from duplex (0, 1) to standby (1, 0) modes. Operating Notes Good RF layout techniques should be used for this device to obtain optimum performance and also minimise crosstalk between circuit blocks. RF supply decoupling should be provided adjacent to Vcc pins; a value of 27pF is recommended. Two external bias resistors are required. A 22k Ω resistor is connected from BIAS REF (Pin 4) to ground. This sets an accurate reference current for the chip. An 18k resistor is connected from RSET TXPA (Pin 8) to ground which controls the output level of the VHF oscillator and hence the TXPA output level. Figure 4 - Application Diagram |
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