
P
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s
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6 - 9
HMC703LP4E
v02.0813
8 GHz fractional syntHesizer
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
978-250-3343 978-250-3373 fax Order On-line at www.hittite.com
Application Support: pll@hittite.com
table 2. Pin Descriptions
Pin Number
Function
Description
1
sCK
CMOs Input: serial port clock
2
sDI
CMOs Input: serial port data
3
DVDD
Power supply for digital - Nominal 3.3 V MAX 25 mA, fPD dependent
4
VDDIO
Power supply for Digital IO - 3.3 V, 8 mA MAX (only when driving LD_sDO)
5
LD_sDO
CMOs Output: General Purpose Output - Lock Detect, serial Data Out, others, selectable
6
TRIG
CMOs Input : External Trigger pin.
7
N/C
No Connect
8
VDDPs
Power supply for RF Divider, Nominal 3.3 V 35 mA MAX
9
N/C
No Connect
10
VCOIP
Differential RF Inputs. Normally AC Coupled, 2 V DC bias generated internally. For single Ended
operation, RFN must be AC coupled to the ground plane, typically 100 pF ceramic. DC Bias of 2.3 V is
generated internally
11
VCOIN
12
VDDHF
Power supply for RF Buffer, Nominal 3.3 V, 6 mA MAX
13
VDDLs
Power supply for PFD to CP Level shifters, Nominal 5 V, 5 mA MAX, fPD dependent.
14
VDDCPA
Power supply for charge pump, Nominal 5 V, 10 mA MAX
15
CP
Charge pump output
16
AVDD
Power supply for analog bias generation, Nominal 3.3 V, 2 mA MAX
17
BIAs
External bypass decoupling for precision bias circuits, 1.920 V +/-2 mV
NOTE: BIAs ref voltage cannot drive an external load. Must be measured with 10 G meter such as
Agilent 34410A, normal 10 M DVM will read erroneously.
18
RVDD
Power supply for Reference path, Nominal 3.3 V. 15 mA MAX reference dependent
19
N/C
No Connect
20
XREFP
Reference Input. DC bias is generated internally. Normally AC coupled externally.
21
VDDPD
Power supply for phase detector. Nominally 3.3 V. Decoupling for this supply is critical. 5 mA MAX, fPD
dependent
22
N/C
No Connect
23
CEN
CMOs Input: Hardware Chip Enable
24
sEN
CMOs Input: serial port latch enable