Power Amplifier Controller

RF142

100774A

Conexant

3

Proprietary Information and Specifications are Subject to Change

September 7, 2000

Gain Shaper. The output of the integrator is fed to the gain

shaping circuit that drives the gain control input of the external

RF PA. The midpoint voltage of the PA control voltage VPC, is

determined by the VMP input. The VMP input is obtained by

connecting a resistor divider to the 2.4 V reference output,

VREF. The integrator in the integrating error amplifier is used to

stabilize the loop.

The maximum voltage obtainable on VPCGSM and VPCDCS is

generally 1 V below VCC2 (pin 20). Therefore, it may be more

desirable to use a higher voltage than VCC.

Output Stages. Each of the two output stages is dedicated to a

frequency band: one for GSM900MHz and one for

GSM1800/PCS1900 MHz. The selection of the output stage is

determined by the BAND select signal. A high signal selects the

VPCDCS as the output pin and a low signal selects VPCGSM

as the output pin. When either output is inactive, its residual

output level is extremely low to ensure that the inactive PA is

completely off.

DC Bias Block. The DC bias block provides voltage bias to the

whole chip, which may be put in standby mode using the

ENABLE digital input control pin (pin 6). The ENABLE pin is

compatible with TTL levels. When the ENABLE pin is driven

high, the device is enabled.

Electro-Static Discharge (ESD) Sensitivity

The RF142 is a static sensitive electronic device. Do not operate

or store it near strong electrostatic fields. Take proper ESD

precautions.

Table 2. Absolute Maximum Ratings

Parameter

Minimum

Maximum

Units

Storage Temperature

–40

+125

°C

Supply Voltage

–0.3

5.0

V

Power Dissipation

--

500

mW

Input Voltage Range

–0.3

Vcc

V

Table 3. RF142 Recommended Operating Conditions

Parameter

Minimum

Typical

Maximum

Units

Supply Voltage (Vcc)

2.7

3.6

4.8

V

Operating Temperature

–30

+25

+85

°C

Table 4. RF142 Electrical Characteristics (1 of 2)

°°°°C, Vcc = 3.6 V)

Parameter

Symbol

Test Condition

Min

Typ

Max

Units

Detector frequency range

f

800

2000

MHz

Detector monotonic dynamic range

50

dB

Detector gain

15

mV/dB

Detector stability

Maximum input power and over temperature range.

Minimum input power and over temperature range.

±0.5

±3

dB

dB

Detector non-linearity error

RFPC

± from –40 dBm to +8 dBm

± 2

dB

VAPC common mode range

1.35

V

VAPC differential range

±1

Vp-p

VAPC input impedance

20//5

k

Ω//pF

VREF

2.2

2.4

2.6

V

GSM Maximum Control Voltage

VPCGSM

Band <= 0.8 V

Ivpcgsm <= 75 mA

Vcc-1.1

Vcc-1.0

Vcc-0.9

V

DCS Maximum Control Voltage

VPCDCS

Band >= 1.90 V

Ivpcdcs <= 50 mA

Vcc-1.1

Vcc-1.0

Vcc-0.9

V