HMC703LP4E Datasheet, PDF (9/58 Pages) Hittite Microwave Corporation – 8 GHZ FRACTIONAL SYNTHESIZER

v02.0813
HMC703LP4E
8 GHz fractional synthesizer
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, f_PD 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
11
VCOIN
generated internally
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, f_PD 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
External bypass decoupling for precision bias circuits, 1.920 V +/-2 mV
17
BIAS
NOTE: BIAS ref voltage cannot drive an external load. Must be measured with 10 GΩ meter such as
Agilent 34410A, normal 10 MΩ 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, f_PD
dependent
22
N/C
No Connect
23
CEN
CMOS Input: Hardware Chip Enable
24
SEN
CMOS Input: Serial port latch enable
6-9
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