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Differential-to-Single Ended Transformer Outputs, I and Q
PIN 15 OF HI5828 (U3), IOUTA
PIN 16 OF HI5828 (U3), IOUTB
V
OUT
= (2 x I
IOUTFS
x R
EQ
)
100Ω
50Ω
50Ω
50Ω
R5
R4
R3
J2 (SMA)
J10 (SMA)
J9 (SMA)
T2
R2
R
EQ
= THE EQUIVALENT IMPEDANCE
SEEN AT EACH DAC OUTPUT (~12.5Ω HERE)
J5
PIN 22 OF HI5828 (U3), QOUTA
PIN 21 OF HI5828 (U3), QOUTB
V
OUT
= (2 x I
QOUTFS
x R
EQ
)
100Ω
50Ω
50Ω
50Ω
R6
R8
R10
J1 (SMA)
J13 (SMA)
J14 (SMA)
T1
R1
R1 NOT USED
J5, J6 ALLOW TRANSFORMER CENTER TAP TO BE GROUNDED.
THIS BIASES THE DAC’S OUTPUT TO 0VDC.
R2 NOT USED
0Ω
J6
0Ω
Appendix D Evaluation Board Bill Of Materials
REFERENCE DESIGNATOR QTY DESCRIPTION
U3 1 HI5828IN, Intersil Dual 12-bit D/A Converter, 48 Pin LQFP
C2, 6 2 10µF, Tantalum Chip Cap, SMD, 10%, 10V
C3, 7, 19, 20, 23, 39, 42, 44-46 10 0.1µF, Ceramic Chip Cap, 0805, 10%, 50V
C4, 8, 40, 41, 43 (Not Populated) 0 1µF, Ceramic Chip Cap, 0805, +80-20%, 16V
R9, 12, 14, 16, 18-42 (Not Populated) 0 50Ω, Chip Resistor, 1210, 5%, 1/4W
R7, 70-97 (R70, 71, 84, 85 Not Populated) 29 0Ω, Chip Resistor, 0805, 1/8W
R4, 8 2 100Ω, Chip Resistor, 0805, 1/8W
R3, 5, 6, 10 (R1, 2 Not Populated) 4 49.9Ω, Chip Resistor, 0805, 1/8W
R15 (Not Populated) 0 25kΩ, Potentiometer Res, 3296W, 1/4W, 10%
R43 1 1.91kΩ, Chip Resistor, 0805, 1/8W
J3, 8 2 1x2 Header
Header Jumper 2 1x2 Header Jumper
T1, 2 2 Mini-Circuits, T1-1T KK81, Z1:Z2 ratio of 1:1
J42 1 96-Pin Eurocard, Right Angle, Female
J1, 2, 9, 10, 13, 14 (J33 Not Populated) 6 SMA Straight Jack, PCB Mount
L1, L2 2 0Ω, Chip Resistor, 1206, 1/8W, 5%
J11, 12, 16, 17, 19, 20, 24-26, 28-32 (Not Populated) 14 Solder Jumpers (Connects I and Q input bits together for driving
with the same pattern)
Mechanical Clamp (Not Populated) 0 DUT Clamp
Plastic Standoffs 4 3/4”
Application Note 9855
