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# FM IF strip ICs

P

#### Phil Hobbs

Jan 1, 1970
0
All my old favourite FM IF ICs seem to be either discontinued (MC1356,
MC13155), hard to get, or cost $5 (SA605). Any suggestions for a nice hackable 2-stage limiting IF amplifier/RSSI chip with at least 20 MHz IF bandwidth, preferably one that gives me the limiter output directly? Thanks, Phil Hobbs F #### Frank Raffaeli Jan 1, 1970 0 All my old favourite FM IF ICs seem to be either discontinued (MC1356, MC13155), hard to get, or cost$5 (SA605). Any suggestions for a nice
hackable 2-stage limiting IF amplifier/RSSI chip with at least 20 MHz IF
bandwidth, preferably one that gives me the limiter output directly?

Thanks,

Phil Hobbs

Philips SA636. Just don't use the mixer.

Thanks,

Frank

P

#### Phil Hobbs

Jan 1, 1970
0
Frank said:
Philips SA636. Just don't use the mixer.

Thanks,

Frank

What's wrong with it? Too weak?

Cheers,

Phil HObbs

J

#### Joop

Jan 1, 1970
0
What's wrong with it? Too weak?

Cheers,

Phil HObbs
He probably means "just use the IF section".
Though I doubt if the 636 would be much cheaper than the 605. The 615
might be worth to look for too. Same as 605 with somewhat lesser
specs.

Joop

F

Jan 1, 1970
0
P

#### Phil Hobbs

Jan 1, 1970
0
Frank said:
The OP might also try the NEC upc3217 / 18
http://www.cel.com/pdf/datasheets/upc3217g.pdf
No RSSI, but 50-55 dB on the ACG. I use it in DSP radios as the preamp

Frank Raffaeli
http://www.aomwireless.com/

Thanks for the steer. One fairly weird thing about these: they're much
noisier for high gains (NF = 13 dB @ 23 dB gain, NF = 6 dB @ 4 dB gain).
I'd expect them to be quieter at high gains, like every other AGC amp
I've ever seen. Are there parallel signal paths or something? I can't
think how you'd make a single-path circuit do that. Weird.

Cheers,

Phil Hobbs

W

#### www.china-powerseller.com

Jan 1, 1970
0
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B

#### [email protected]

Jan 1, 1970
0
We are using the SA605 right now and like it so far. There are good
application notes for it, but it is about 10 years old so I think no
current support from Phillips. We are using it with two of the
narrowest ceramic filters from Murata (CFWLA455KJFA - available from
Mouser). We are tapping right off the limiter output, but it is high
output impedence, so be careful of that (different loads affect the
RSSI reading!). No evalauation boards exist, good layout is important.

Another options are the chips from New Japan Radio Company. Search
under "NJM" in Digikey. Samples online are possible from manufacturer,
but take a few weeks to get.

BenL

P

#### Paul Mathews

Jan 1, 1970
0
We are using the SA605 right now and like it so far. There are good
application notes for it, but it is about 10 years old so I think no
current support from Phillips. We are using it with two of the
narrowest ceramic filters from Murata (CFWLA455KJFA - available from
Mouser). We are tapping right off the limiter output, but it is high
output impedence, so be careful of that (different loads affect the
RSSI reading!). No evalauation boards exist, good layout is important.

Another options are the chips from New Japan Radio Company. Search
under "NJM" in Digikey. Samples online are possible from manufacturer,
but take a few weeks to get.

BenL

Paul Mathews

W

#### www.china-powerseller.com

Jan 1, 1970
0
Dear friend :
It is my fortunate writing to you . you will discover this is a wealth
accumulation place.
The website of our company is http://www.china-powerseller.com
We are a big agent for Laptop
Mobile Phone\Digital Camera\CDJ\DJM\Apple Ipod\PSP\VEDEO GAMES
\Television\GPS\Telescope in CHINA .
All of our commodities is the most advanced quality but lowest price.
we also have the

safest and most
convenient transaction way to guarante the transaction arries on
normally .
looking forward to your coorporation and cause all of us both to
profit.
MSN: china.seller#hotmail.com
best wishes!

http://www.china-powerseller.com
MSN/Email: [email protected]

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