CMX980AL7 CML Microcircuits, CMX980AL7 Datasheet - Page 94

• Manufacturer Part Number: CMX980AL7
• Description: TETRA Baseband Processor
• Manufacturer: CML Microcircuits

TETRA Baseband Processor
Notes:
General Points:
1999 Consumer Microcircuits Limited
1. Not including any current drawn from the device pins by external circuitry.
2. Timing for an external input to the MCLK pin.
3. The current quoted when MCLK is not toggled is essentially analogue current (digital current is
4. Powering down the Rx AAF when Rx and Bias sections are enabled reduces 3.3V current by
5. BiasChainPowDn and BiasPowDn must be inactive (i.e. bias section powered up) in order to
6. Currents in other modes can be calculated from the above figures. For example, operation at
7. Supply currents for other MCLK frequencies can be calculated by assuming the analogue
negligible in this case), while the current quoted when MCLK is toggled is a combination of
analogue and digital current.
0.9mA, 5.0V current by 1.5mA.
power up the Tx and Rx sections, but NOT the auxiliary section. It is recommended that
BiasChainPowDn is activated at least 0.5ms before powering up the Tx or Rx, owing to the
long time constant associated with this function. When the Tx and Rx are powered down,
setting BiasPowDn active reduces current by a further 200 A, while setting BiasChainPowDn
active reduces current by a further 30-50 A.
3.3V with Tx and Auxiliary sections power saved:
From the table, auxiliary current is approximately 2.5mA (31-28.5mA).
Subtracting this from Tx powersaved current (21mA) gives a predicted current of 18.5mA.
current is constant and the digital current is proportional to MCLK frequency.
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