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Re: [Discuss-gnuradio] FrontEnd4702 take 2
From: |
Matt Ettus |
Subject: |
Re: [Discuss-gnuradio] FrontEnd4702 take 2 |
Date: |
Wed, 25 Feb 2004 10:04:28 -0800 |
User-agent: |
Internet Messaging Program (IMP) 4.0-cvs |
Quoting Eric Blossom <address@hidden>:
> This still leaves a snafu regarding using the aux_DAC outputs for AGC,
> since there aren't enough of them for each card to have it's own, let
> alone two.
No it doesn't. Each TX/RX pair gets 4 shared DAC outputs. There are 8 total
DAC outputs on the board, 4 for each TX/RX pair. So using 2 for an RX board is
fine.
> The Analog Devices AD8801 TrimDAC would do the job. It's kind of
> overkill, but it would work. It's got 8 8-bit DACs in it, and runs on
> the 3 wire SPI bus at 3.3V. You'd still need the single-supply
> rail-to-rail op-amp at +5V to get the range right. The daughtercards
> each support SPI with board specific enables. There are probably
> similar parts from other vendors.
Totally unnecessary.
> I heartily agree. We ought to be able to plug the daughterboards in
> to any slot without setting jumpers, and they ought to work.
If the 4702 followed the A2/A1/A0 convention, that would be simple. Since it
doesn't, we have to work with what we have.
Matt
- [Discuss-gnuradio] intel on radio spectrum policy, Eric Blossom, 2004/02/20
- [Discuss-gnuradio] frontend4702 schematic and layout, cfk, 2004/02/22
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, Matt Ettus, 2004/02/23
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, cfk, 2004/02/23
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, Eric Blossom, 2004/02/24
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, Matt Ettus, 2004/02/24
- [Discuss-gnuradio] FrontEnd4702 take 2, cfk, 2004/02/24
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, Matt Ettus, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, John Gilmore, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, Eric Blossom, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 2,
Matt Ettus <=
- Re: [Discuss-gnuradio] FrontEnd4702 take 29, Eric Blossom, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 29, Matt Ettus, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, Matt Ettus, 2004/02/25
- [Discuss-gnuradio] Better link to front end layout, cfk, 2004/02/25
- Re: [Discuss-gnuradio] Better link to front end layout, Matt Ettus, 2004/02/26
- [Discuss-gnuradio] New FrontEnd Schematic & Layout, cfk, 2004/02/26
- Re: [Discuss-gnuradio] New FrontEnd Schematic & Layout, Eric Blossom, 2004/02/27
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, John Gilmore, 2004/02/25
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, Eric Blossom, 2004/02/24
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, Matt Ettus, 2004/02/24