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LTC5541IUH#TRPBF

P1-P3P4-P6P7-P9P10-P10
FREQUENCY DIVIDERS & DETECTORS - SMT
6
6 - 56
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
The circuit board used in the  nal application should use RF circuit design techniques. Signal lines should have
50 ohm impedance while the package ground leads and backside ground slug should be connected directly to
the ground plane similar to that shown. A sufficient number of via holes should be used to connect the top and
bottom ground planes. The evaluation circuit board shown is available from Hittite upon request.
Evaluation PCB
List of Materials for
Evaluation PCB 104898
[1]
Note: The evaluation PCB for the HMC394LP4 contains
10K Ohm pull up resistors for each of the  ve control inputs
A0 through A4. Programming the 31 distinct division ratios
consists of installing or removing jumpers S1 through S5, as
shown above. Jumper S6 must always be installed to provide
ground to pin 20.
HMC394LP4 Evaluation
PCB Truth Table
Function S1 S2 S3 S4 S5
Output Low 0 0 0 0 0
/ 2 1 0 0 0 0
/ 3 0 1 0 0 0
/ 4 1 1 0 0 0
------
/ 32 1 1 1 1 1
Note: 0 = Jumper Installed.
1 = Jumper Not Installed.
Item Description
J1 - J3 PCB Mount SMA RF Connector
C1 - C2
[2]
1.0 μF Tantalum Capacitor
C3 - C4
[2]
.01 μF Capacitor, 0603 Pkg.
C5 - C8 1000 pF Capacitor, 0603 Pkg.
R1* Resistor SIP 10 K ohm
S1 - S6 Jumper (shunt) 2mm
U1
HMC394LP4 / HMC394LP4E
5-Bit Counter
PCB 104435 Eval Board
[1] Reference this number when ordering complete evaluation PCB
[2] Optional components.
HMC394LP4 / 394LP4E
GaAs HBT PROGRAMMABLE
5-BIT COUNTER, DC - 2.2 GHz
v08.0607
FREQUENCY DIVIDERS & DETECTORS - SMT
6
6 - 57
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
Applications Information
Simpli ed Block Diagram
Asynchronous Programming
The 5-Bit programmable counter counts-down from the programmed value of the data bits to zero and issues an
output pulse at the end of each cycle. Settling time of the programmable 5-Bit counter is de ned as the maximum
time required for the counter to change the division ratio N to a new value after the data bits have settled. The worst
case settling time occurs if the data bits A0 thru A4 are changing during the load cycle. Under this condition, the
data bits may potentially be erroneous when they are clocked in and in the worst case could be all 1’s, requiring 32
clock cycles until the correct data is re-loaded into the  ip  ops. The worst case asynchronous settling time can be
calculated as follows:
T
SETTLING MAX
= 32/f
IN
(For Asynchronous Programming)
As an example, if the input frequency is 1 GHz, the maximum settling time is 32 nS
HMC394LP4 / 394LP4E
GaAs HBT PROGRAMMABLE
5-BIT COUNTER, DC - 2.2 GHz
v08.0607
FREQUENCY DIVIDERS & DETECTORS - SMT
6
6 - 58
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
Synchronous Programming
For applications which can not tolerate a momentary unde ned division ratio, which normally occurs while changing
the data bits (A0-A4) at random, synchronous programming can be used. Data is loaded into the counter on every
rising edge of the clock which occurs while the output (OUT) is “HIGH”. The typical minimum setup and hold times are
shown in the table below as a function of frequency. For precision applications, the rising edge of the complementary
output may be used to latch the new data bits (A0-A4), so that all bits are settled before the next load cycle.
T
SETTLING MAX
= N/f
IN
(For Synchronous Programming)
Where N is the desired division ratio, and f
IN
= Input Frequency (Hz)
Programmable Divider Timing Requirements
for Synchronous Programming
IN
OUT
OUT
CURRENT DATA NEW DATA
A0-A4
t
SU
t
HOLD
Data Load
Rising Edge
Rising Edge to
Clock New Data
Parameter 0.5 GHz 1 GHz 2 GHz
t
SETUP
200 ps 200 ps 200 ps
t
HOLD
700 ps 300 ps 120 ps
HMC394LP4 / 394LP4E
GaAs HBT PROGRAMMABLE
5-BIT COUNTER, DC - 2.2 GHz
v08.0607
P1-P3P4-P6P7-P9P10-P10

LTC5541IUH#TRPBF

Mfr. #:
Buy LTC5541IUH#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
RF Mixer 1.3GHz - 2.3GHz High Dynamic Range Downconverting Mixer
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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