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SP8854E
2·7GHz Parallel Load Professional Synthesiser
Preliminary Information
Supersedes January 1996 version, DS4238 - 1.2
DS4238 - 2.0 June 1998
The SP8854E is one of a family of parallel load synthesisers
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
1
5V. The device can
therefore be programmed with a single transfer from the
control microprocessor. Hard wired inputs can also control
the
F
PD
and F
REF
outputs and the control sense of the loop.
FEATURES
I
2·7 GHz Operating Frequency
I
Single 5V Supply
I
Low Power Consumption <1·3W
I
High Comparison Frequency : 20MHz
I
High Gain Phase Detector : 1mA/rad
I
Zero ‘Dead Band’ Phase Detector
I
Wide Range of RF and Reference Division Ratios
I
Programming by Single Word Data Transfer
ABSOLUTE MAXIMUM RATINGS
Supply voltage
Operating temperature
Storage temperature
Prescaler and reference input voltage
Data inputs
Junction temperature
2
0·3V to
1
6V
2
55
°
C to
1
100
°
C
2
65
°
C to
1
150
°
C
2·5V p-p
V
CC
1
0·3V
V
EE
2
0·3V
1
175
°
C
ORDERING INFORMATION
SP8854E KG HCAR
Non-standard temperature range,
2
55
°
C to
1
100
°
C, standard product screening
SP8854E IG HCAR
Industrial temperature range,
2
40
°
C to
1
85
°
C, standard product screening
Fig. 1 Pin connections - top view
*F
and F
outputs are reversed using the control
direction input, pin 23. The above diagram is correct
when pin 23 is high.
1 44
DATA BIT 4
DATA BIT 3
DATA BIT 2
DATA BIT 1
DATA BIT 0
0V (PRESCALER)
RF INPUT
RF INPUT
V
CC
(PRESCALER)
VEE
LOCK DETECT
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
C
R
S
C
C
F
P
/
R
C
F
P
*
F
R
*
V
C
R
R
D
D
D
D
D
D
D
D
D
D
D
SP8854E
HC44
THERMAL DATA
u
JC
= 5
°
C/W
u
JA
= 53
°
C/W
ESD PROTECTION
1000V, human body model