LMH6514 no output signal issue

Yuan Legend

Other Parts Discussed in Thread: LMH6514

Dear，

I used LMH6514 for design, but there is no any output . The Power supply is normal, and Gain0~2 & Latch used with 3.3V logic signal. I try Gain0~2 for 000,001,010 ect but all are the same, no any output signal.Could you give any suggestion?

The schematic is below:

over 7 years ago

0 Loren Siebert 1 over 7 years ago

TI__Genius 13935 points

Hello Yuan,

What is your input signal? What is the source impedance?

Are you measuring the output on pins 14 and 15?

In the datasheet look at figures 53, 54 and 55. These show the best way to configure the amplifier. Your connections require the 5V supply voltage to go through the internal resistors to power the amplifier output stage. If you connect inductors as show in Figure 54 your circuit should work better.

Regards,

Loren

0 Yuan Legend over 7 years ago in reply to Loren Siebert 1

Prodigy 80 points

Hi
I used signal generator to give the input signal, and modify as Figure 54 to configure the amplifier, but on pin 14 and 15 also have no output?

0 Loren Siebert 1 over 7 years ago in reply to Yuan Legend

TI__Genius 13935 points

Hi Yuan,

Can you measure the DC voltages on the pins? Did you AC couple the inputs? If the input pins are pulled below 0.9V the amplifier will shut down.

Regards,
Loren

Amplifiers

Amplifiers forum

LMH6514 no output signal issue