SP8854E
2·7GHz Parallel Load Professional Synthesiser
Preliminary Information
Supersedes January 1996 version, DS4238 - 1.2
DS4238 - 2.0 June 1998
TheSP8854Eisoneofafamilyofparallelloadsynthesisers
containing all the elements apart from the loop amplifier to
fabricate a PLL synthesis loop. Other parts in the series are
the SP8852E which is fully programmable, requiring tw0 16-
bit words to set the RF and reference counters and the
SP8855E which is fully programmable using hard wired links
or switches.
The SP8854E is programmed using a 16-bit parallel data
bus. Data is stored in an internal buffer. The 10-bit program-
mable reference divider is programmed by connecting the 10
programming pins either to ground or 15V. The device can
therefore be programmed with a single transfer from the
control microprocessor. Hard wired inputs can also control
the FPD and FREF outputs and the control sense of the loop.
1
44
DATA BIT 4
DATA BIT 3
DATA BIT 2
DATA BIT 1
DATA BIT 0
STROBE
REF DIV BIT 0
REF DIV BIT 1
REF DIV BIT 2
REF DIV BIT 3
REF DIV BIT 4
REF DIV BIT 5
REF DIV BIT 6
REF DIV BIT 7
REF DIV BIT 8
REF DIV BIT 9
0V (PRESCALER)
RF INPUT
SP8854E
RF INPUT
V
(PRESCALER)
CC
V
EE
LOCK DETECT
FEATURES
■ 2·7 GHz Operating Frequency
■ Single 5V Supply
■ Low Power Consumption <1·3W
■ High Comparison Frequency : 20MHz
■ High Gain Phase Detector : 1mA/rad
■ Zero ‘Dead Band’ Phase Detector
■ Wide Range of RF and Reference Division Ratios
■ Programming by Single Word Data Transfer
HC44
*FPD and FREF outputs are reversed using the control
direction input, pin 23. The above diagram is correct
when pin 23 is high.
ABSOLUTE MAXIMUM RATINGS
Supply voltage
20·3V to 16V
255°C to1100°C
265°C to 1150°C
2·5V p-p
Operating temperature
Storage temperature
Prescaler and reference input voltage
Data inputs
Fig. 1 Pin connections - top view
VCC 10·3V
V
EE 20·3V
Junction temperature
1175°C
THERMAL DATA
uJC = 5°C/W
uJA = 53°C/W
ORDERING INFORMATION
SP8854E KG HCAR Non-standard temperature range,
255°C to 1100°C, standard product screening
ESD PROTECTION
SP8854E IG HCAR Industrial temperature range,
240°C to 185°C, standard product screening
1000V, human body model