[time-nuts] power supply design Re: Slightly OT: interest in a four-output, > ultra-low jitter, synthesizer block?

Mark Goldberg marklgoldberg at gmail.com
Thu Jan 25 23:26:19 EST 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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