[time-nuts] New pics of RFTG-m-Rb, and some comparison details

David I. Emery die at dieconsulting.com
Sun Dec 31 03:54:26 EST 2006

On Sat, Dec 30, 2006 at 02:24:32PM -0500, John Ackermann N8UR wrote:
> On the mezzanine board, U302, a Burr Brown ADS7807U (presumably an ADC,
> though I haven't looked it up yet) is present on the XO version, but
> missing on the Rb version.  And, programmable device U103 has a
> different number.  On the XO version it is "105681-001 03/02 Ver 9.0"
> while on the Rb version it is "105089-001 Ver .04 9731".  There's
> another programmable device (U202), but it has identical part and
> version numbers on both units.

	The ADS7807 on the mezzanine board is indeed a 16 bit A/D with
sampler and a 25 us sample rate.

	There is also a Analog Devices AD660AR 16 bit integrated DAC and
precision reference and buffer amp with guaranteed monotonicity in 16

	And next to it is a Ref02c precision 5 volt reference and a
AD603  programmable gain amplifier.

	And further over is a Maxim MAX154AEWG 4 channel 8 bit ADC with
2.5 us sample time and bus interface for a micro build in.

	And a LM324 Quad op amp.   And a 4 channel Harris SP720AB
transient protector.

	Other than that, I find a XiCOR 2K by 8 EEPROM, a CMOS 32K by 8
RAM, and various glue logic.

   Dave Emery N1PRE,  die at dieconsulting.com  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."

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