Datasheet

-5 V GND +5 V

J41

Board Configuration

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2 Board Configuration

2.1 Power Supplies

The current EVM requires +5-V and –5-V power supplies externally. The external power supplies are

connected through the J41 header as indicated in Figure 3. Two test points are for these input supplies:

TP1 (+5 V) and TP2 (–5 V). No test point is available for +3.3 V. The user can measure pin 1 of header

J43 to check the voltage level.

Figure 3. Power Supply Header

Table 1. Power Test Points

Test Point Function

TP1 +5 V

TP2 –5 V

2.2 LED Indicators

The TX810EVM has three LEDs on the board as shown in Figure 2. Their states demonstrate the normal

operation of the TX810EVM.

Table 2. LED Indicators

LED Indicated Functions

D1 +5-V power supply is on

D2 –5-V power supply is on

D3 +3.3-V regulator is working

2.3 Bias Current Control – Manual

The bias current is controlled by the pins B2, B1, and B0 of the device. The three pins are connected to

the 4-pin DIP switch, S1 ( Figure 2). The user can adjust the switches to set up the test conditions. Three

test points (TP3 for B1, TP4 for B2, and TP5 for B3) are associated with the setting. One +3.3-V LDO, U2,

( Figure 2) is on the board to provide the ON/OFF setting to B2, B1, and B0 pins of the device.

Figure 4. DIP Switch for Manual Control of Bias Current

Table 3. Test Points TP22-PT24

TEST POINTS CONTROL PIN

TP3 B1

TP4 B2

TP5 B3

TX810, 8-Channel, Current-Programmable, Low-Noise, Transmit/Receive Switch SLLU141A–March 2011–Revised May 2011

Evaluation Module

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