1 Description
The TRF1208 evaluation module (EVM) is used to evaluate the TRF1208 device, which is a single-ended input
to differential output RF amplifier available in a 2 × 2-mm
2
, 12-pin WQFN package. The device is designed to
drive a high-speed differential input ADC without using a passive balun.
The board is set up for 50-Ω single-ended input matching. The amplifier has a low output impedance. The board
has ac-coupling capacitors at input and output. The EVM is ready to connect to a +3.3-V power supply, signal
source, and test instruments for the measurements.
1.1 Features
• Operates on a 3.3-V supply.
• Designed for a single-ended 50-Ω input matching.
• Simple interface to the inputs and output through onboard SMA connectors.
• Power down option available onboard using a jumper connector.
(J4)
TRF1208
+3.3-V Single Bench
Power Supply
+3.3 V
GND
(J6)
TRF1208 EVM
(J1)
DMM
(Current
Measurement)
(J5)
RF Signal Generator
Spectrum Analyzer
Hyperlabs HL9402
or similar
0°
180°
2:1, Zo = 50
3-dB pad
6-dB pad
6-dB pad
3-dB pad
INP
INM
OUTM
OUTP
Figure 1-1. Single Tone Setup for Gain and Output P1dB
1.2 General Usage Information
This section provides general usage information for the TRF1208 EVM. See for a general single tone setup
diagram as a reference point for the following instructions. Some components such as supply bypass capacitors
are omitted for clarity.
1. Recommended power up sequence:
a. Before connecting the power-supply cables to the EVM, set the DC output power supply to +3.3 V.
b. Set the current limit of the DC output power supply at 250 mA.
c. Making sure the supply is turned off, connect the power supply cables to the J1 connector of the EVM.
d. Now turn on the DC power supply of VCC = +3.3 V. The supply current (I
Q
) drawn from the power supply
should be approximately 135 mA.
e. If the supply current is low, ensure that the device is not disabled by the PD pin.
2. Power-down option:
a. C1.8 V (logic-1) on PD pin to power-down the chip. Ground the PD pin to enable the chip.
Description
2
TRF1208 Evaluation Module
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