SY87729LHI Micrel Inc, SY87729LHI Datasheet - Page 9

• Manufacturer Part Number: SY87729LHI
• Description: IC SYNTHESIZER FRACT 3.3V 32TQFP
• Manufacturer: Micrel Inc
• Type: Fractional Synthesizerr

Specifications of SY87729LHI

• Input: PECL
• Output: PECL
• Frequency - Max: 365MHz
• Voltage - Supply: 3.15 V ~ 3.45 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP Exposed Pad, 32-eTQFP, 32-HTQFP, 32-VQFP
• Frequency-max: 365MHz
• For Use With: 576-1404 - BOARD EVAL N SY87729 EXPERIMENT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Micrel, Inc.
P Divider
down before appearing at the CLKOUT± pins. Notice that,
given the range of the wrapper VCO (540MHz to 729MHz)
and the maximum and minimum division ratios of the P
divider (2 to 60, as shown in Table 5), the minimum and
maximum frequency of CLKOUT± is 9MHz and 364.5MHz
respectively.
PostDivSel register determines the divisor value. It is set as
per Table 5. The SY87729L does not guarantee a 50%
duty cycle output. It is designed to provide well-timed rising
edges only.
M9999-062807
[e-mail] or [phone]
The output of the wrapper synthesizer is post divided
The divisor value is selected via MicroWire™. The 5-bit
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Table 5. Setting to Program the Division Ratio
3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
PostDivSel Bit
of the P Divider
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Divisor
10
11
12
13
14
15
16
18
20
22
24
26
28
30
32
36
40
44
48
52
56
60
2
3
2
3
4
5
6
7
8
9
9
MicroWire™ Interface
SY87729L to microcontrollers. The SY87729L accepts one
data bit on PROGDI per rising edge on PROGSK. The data
is ignored when PROGCS is inactive low. When PROGCS
is active high, bits are shifted into the SY87729L. The falling
edge of PROGCS then initiates acquisition of the output
frequency defined by the 32-bit program just loaded into
the SY87729L.
on the same program, PROGCS needs to toggle high then
low.
Programming
frequency:
serial data streaming protocols. Summary programming
information appears in the next section. The SY87729L also
enables Micrel’s SY87721L AnyRate
virtually anything within its range of operation, all from a
27.000MHz reference. Details about how to program the
SY87729L in the general case, including derivation of
programs for both the standard protocols and the AnyRate
application, appear in an applications note.
This standard bit-serial interface eases interfacing the
This means that, if the user wishes to re-acquire based
To program the SY87729L to generate a certain
1. Determine the required values of the programming
2. Set PROGCS active high.
3. Shift in each of the 32 bits, as per Table 6. The fields
4. Set PROGCS inactive low.
5. Wait for LOCKED to assert high.
The SY87729L generates exact frequencies for common
PostDivSel
Preamble
MdivSel
NdivSel
parameters, as summarized in Table 6.
are loaded in sequence, from the first row to the last
row. For each multi-bit field, the most significant bit is
shifted in first. Shift the bits in through PROGDI,
clocking them with PROGSK edges.
divsel
qpm1
Field
mfg.
qp
Table 6. Programming Sequence
# Bits
4
5
5
4
3
5
3
3
Section: Gating the P/P-1 Divider
Section: Gating the P/P-1 Divider
always "0000"
always "000"
Reference
Table 1
Table 5
Table 4
Table 3
®
CDR to decode
AnyClock
SY87729L
®
®