RF Micro Devices Inc.

7628 Thorndike Road, Greensboro, NC 27409-9421

DS141006

For sales or technical support, contact RFMD at +1.336.678.5570 or customerservice@rfmd.com.

The information in this publication is believed to be accurate. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents or other rights of

third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent rights of RFMD. RFMD reserves the right to change component circuitry, recommended

application circuitry and specifications at any time without prior notice.

5 of 8

RFCM3326

RFCM3326 Temperature Sensing Feature

The RFCM3326 provides an internal NTC resistor for temperature sensing. This resistor is located right next to the

output transistor stage. Within the application circuit the NTC is built in a voltage divider. The output voltage of the

voltage divider (Vt) can be correlated to the module backside temperature.

Module Backside Temperature versus Vt (typical values)

20

30

40

50

60

70

80

90

100

110

120

750

1000

1250

1500

1750

2000

2250

2500

2750

3000

3250

3500

3750

4000

Temperature [°C]

Vt [mV]