Notes on MicroSource MSS252-791-002 Synthesizer Modules


LMDS Synthesizer Block Diagram
MC12022 MECL prescaler data sheet
Qualcomm Q3236 PLL data sheet (8/1997) (alternate copy here is shorter but more legible)
Qualcomm Synthesizer Products (4/2000, with some rendering problems)
Phase noise 26 GHz
Pictures and Brief Description
Revised Detailed Block Diagram
SNP2627 Block Diagram
SNP 520-series Data (another MicroSource YIG synthesizer with superior PN and tuning range)


Connection data


Wiring Reference for 25 pin D connector
MSS2527-910-04 	
DC200393001 	

PIN 	REF 	     	Q3236 function(s)
____________________________________________

1 	d3 	     	A3, SMODE
2 	d1 	     	A1

3 	d8 	     	M4, DBUS4, SEN\
4 	d6		M2, DBUS2
5 	d4		M0, DBUS0
	
6 	F LOCK 	
7 	PWR BIT 	
	
8 	 +5 VDC, 700 mA
9 	+15 VDC, 300 mA
10 	-15 VDC, 45 mA	
11 	NC 	
	
12 	NC 	
13 	NC 	
	
	
14 	d2 		A2, M2 WR
15 	d0 		A0, FSELP
			     
16 	d7 		M3, DBUS3
17 	d5 		M1, DBUS1
	
18 	grnd 	
19 	grnd 	
20 	grnd 	
21 	grnd 	
22 	grnd 	
23 	grnd 	
	
24 	NC 	
25 	NC 	


Programming notes


Calculate: 
	       
	N = Fmix / Fpfd

where Fpfd is always 5 MHz (i.e., 960 MHz / 192) and Fmix is the desired YTO frequency Fyto minus 12480 MHz (960*13).

Then, calculate M and A:

	M = int(N/10) - 1
	A = N - 10(M+1)

where the lower 5 bits of M are applied to these pins:

	M0: 5
	M1: 17
	M2: 4
	M3: 16
	M4: 3

and A is a 4-bit value applied to these pins:

	A0: 15
	A1: 2
	A2: 14
	A3: 1
	
Notes:


Observed residual phase noise



Two units were driven by a common 960-MHz source, with their outputs mixed down to 400 MHz and measured with a 3-dB correction factor. Actual residual noise is a bit better due to the nonzero IF.


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