[time-nuts] power supply design Re: Slightly OT: interest in a four-output, > ultra-low jitter, synthesizer block?
Mark Goldberg
marklgoldberg at gmail.com
Fri Jan 26 04:26:19 UTC 2018
On Thu, Jan 25, 2018 at 8:51 PM, jimlux <jimlux at earthlink.net> wrote:
> What we've done is switcher from wide range bus (9-24V) to 8V, 60 dB
> ultimate attenuation low pass, switcher 8V to 5V(e.g.), 60 db low pass,
> linear with great HF rejection (i.e. the LT3042) to 3V
>
If it is any help to someone, I did some research on low noise regulators
to drive a low phase noise oscillator. You will have to look at this in a
fixed width font. LT3042 is indeed a spectacular part with way less noise
than the baseline LT3009. Hopefully no mistakes below. Pricing is about 2
years old.
Part Manufacturer Price Packages mA Added Added RMS
Noise RMS Noise Spot Noise Noise at 100 Hz Noise at 1000
Hz 100 Hz Noise 1000 Hz Noise
Caps Resistors 10 Hz -
100 kHz 100 Hz - 100 kHz 10 kHz nV/Sqrt(Hz) nV/Sqrt(Hz)
Ratio dB Ratio dB
uVrms uVrms nV/Sqrt(Hz)
LT3009 Linear Tech SC70-8 20
150 6000
2500 0.0 0.0
LT3042 Linear Tech $4.90 10MSOP 3x3DFN 200 2 5
0.8 2 10
1.5 -55.6 -64.4
ADM7154 Analog Dev $5.95 8LFCSP 8SOIC 600 4
1.6 0.9 1.5 10
1.8 -55.6 -62.9
TPS7A47 TI $4.69 UQFN20 1000 2
4 100
20 -35.6 -41.9
LP38798 TI $3.19 WSON12 4X4 800 2 2
5 100
40 -35.6 -35.9
LP5907 TI $0.57 SOT23-5 250 1
6.5 180
50 -30.5 -34.0
LP5900 TI $0.70 WSON6 150 1
6.5 300
40 -26.0 -35.9
MAX8510 Maxim $1.22 SC70-5 TDFN 120
2 11
300 60 -26.0 -32.4
LT1962 Linear Tech $2.39 8MSOP 300 2
20 300
80 -26.0 -29.9
Mark
W7MLG
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