
MC13109A
10 MOTOROLA RF/IF DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued)
Splatter Amplifier
The Splatter Amplifier is an inverting rail–to–rail output
operational amplifier with the non–inverting input terminal
connected to the internal VB half supply reference. External
resistors and capacitors can be connected to set the gain and
frequency response. The “Spl Amp In” input is ac coupled.
(Test Conditions: VCC = 2.6 V, TA = 25°C, fin = 1.0 kHz, External resistors Set for Gain of 1.)
Characteristic Condition Input
Pin Measure
Pin Symbol Min Typ Max Unit
Open Loop Gain –Spl Amp
In Tx Out AVOL – 60 – dB
Gain Bandwidth –Spl Amp
In Tx Out GBW – 100 – kHz
Maximum Output Swing RL = 10 kΩSpl Amp
In Tx Out VOmax – VCC – 0.3 – Vpp
Tx Audio Path Recommendation
The recommended configuration for the Tx Audio path
includes setting the Microphone Amplifier gain to 16 dB using
the external gain setting resistors and setting the Splatter
Amplifier gain to 9.0 dB using the external gain setting
resistors.
PLL Voltage Regulator
The PLL supply voltage is regulated to a nominal of 2.2 V.
The “VCC Audio” pin is the supply voltage for the internal
voltage regulator. The “PLL Vref ” pin is the 2.2 V regulated
output voltage. T wo capacitors with 10 µF and 0.01 µF values
must be connected to the “PLL V ref ” pin to filter and stabilize
this regulated voltage. The voltage regulator provides power
for the 2nd LO, Rx and Tx PLL’s, and MPU Interface. The
voltage regulator can also be used to provide a regulated
supply voltage for external IC’s. Rx and Tx PLL loop
performance are independent of the power supply voltage
when the voltage regulator is used. The voltage regulator
requires about 200 mV of “headroom”. When the power
supply decreases to within about 200 mV of the output
voltage, the regulator will go out of regulation but the output
voltage will not turn off. Instead, the output voltage will
maintain about a 200 mV delta to the power supply voltage as
the power supply voltage continues to decrease. The “PLL
Vref” pin can be connected to “VCC Audio” by the external
wiring if voltage higher than 2.2 V is required. But it should
not be connected to other supply except “VCC Audio”. The
voltage regulator is “on” in the Active and Rx modes. In the
Standby and Inactive modes, the voltage regulator is turned
off to reduce current drain and the “PLL Vref” pin is internally
connected to “VCC Audio” (i.e., the supply voltage is
maintained but is now unregulated).
(Test Conditions: VCC = 2.6 V, TA = 25°C.)
Characteristic Condition Input
Pin Measure
Pin Symbol Min Typ Max Unit
Output Voltge Level VCC = 2.6 V,
OL= 0 mA – VCC PLL Vout – 2.2 – V
Line Regulation IL = 0 mA, VCC = 2.6 to
5.5 V VCC VCC PLL Reg line – 3.66 40 mV
Load Regulation VCC = 2.6 V, IL = 0 to
1.0 mA VCC VCC PLL Regload –40 –2.28 – mV