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Order On-line at www.hittite.com 13 - 14
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v0 7.1013 ACTIVE BIAS CONTROLLER
Full Featured Evaluation PCB
Careful PCB layout is critical to achieve stable and
low noise operation. The negative voltage genera-
tor charge pump stage requires particular attention.
To isolate the charge pump switching noise from the
analog circuit blocks, create two separate ground
planes dedicated to AGND and DGND connections.
Connect AGND (pin#17) and DGND (pin#16) pins to
the paddle at a single point under the package. Con-
nect all the components connected to the charge
pump (D1, C12 and C14 in the application circuit) to
DGND plane, and connect rest of the external compo-
nents to a low noise AGND.
List of Materials for Full Featured Evaluation PCB 130511 [1]
Item Description
TP2, TP8 - TP11,
TP14, TP15, TP17 DC Test Point
C2 47 pF Capacitor, 0402 Pkg.
C5, C9 10 µF Capacitor, Case B Tantalum
C6, C14 4.7 µF Capacitor, 0805 Pkg.
C12, C21 10 µF Capacitor, 0805 Pkg.
C13 0.33 µF Capacitor, 0603 Pkg.
C19 22 µF Capacitor, Tantalum
C20 0.1 µF Capacitor, 0402 Pkg.
C22 0.1 µF Capacitor, 0805 Pkg.
C24 100 pF Capacitor, 0603 Pkg.
R2, R29 0 Ohm Resistor, 0805 Pkg.
R4 270 Ohm Resistor, 0402 Pkg.
R5, R26 10 kOhm Resistor, 0603 Pkg.
R10 50 kOhm Potentiometer
R14 1 kOhm Resistor, 0603 Pkg.
R15 3.32 kOhm Resistor, 0603 Pkg.
R16 1.69 kOhm Resistor, 0603 Pkg.
R19 5 kOhm Potentiometer
R20, R22 1.8M Ohm Resistor, 0603 Pkg.
R27 10 kOhm 0.5% ±25ppm/°C
Resistor, 0402 Pkg.
R28 0 Ohm Resistor, 0402 Pkg.
Item Description
D1 Dual Schottky Diode (Digi-Key part
number: BAT54SLT1GOSCT-ND)
SW1 DIP 4 Position Half-Pitch Switch
SW2 DIP 2 Position Half-Pitch Switch
U1 HMC920LP5E Active Bias Controller
PCB [2] 128399 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: FR4