Analog Devices AD8342 specifications Evaluation Board, Component Function, Default Conditions

AD8342

EVALUATION BOARD

An evaluation board is available for the AD8342. The evaluation board is configured for single-ended signaling at the IF output port via a balun transformer. The schematic for the evaluation board is presented in Figure 53.

PWDN	PWDN				R8			C11
					10kΩ
							100pF
		W1			R9		R6
GND VPOS
		VPOS	R7		0Ω		Ω
			0Ω				1.82k
		C12		C13
		0.1∝F		100pF			9
				12	11	10
				VPDC	PWDN EXRB COMM				Z2	R3
									OPEN
				13 COMM			COMM	8	R10	OPEN
									0Ω

L1

C1

Z1

T1

IF_OUT+

50Ω

1000pF

3

4

0

Ω

TRACE

14

RFCM

IFOP

7

OPEN R12

Ω

2

100

TRACES,

RF_IN

R5

C3

DUT

Z3

OPEN

C14

R11

1

6 NO GROUND PLANE

OPEN

100Ω

1000pF

RFIN

IFOM

OPEN

TC2-1T

15

6

0Ω

R4

R1

Z4

VPOS

16

VPMX

COMM

5

OPEN

OPEN

C2

0Ω

IF_OUT–

C4

R15

∝

1000pF

VPLO

LOCM

LOIN

COMM

0.1 F

R16

0Ω

1

2

3

4

VPOS

R2

0Ω

C7

C10

C9

0Ω

100pF

0.1∝F

C5

C6

1000pF

C8

0.1∝F

1000pF

1000pF

05352-003

INLO

	Figure 53. Evaluation Board
Table 6. Evaluation Board Configuration Options
Component	Function
R1, R2, R7,	Supply decoupling. Shorts or power supply decoupling resistors and filter
C2, C4, C5, C6, C10	capacitors.
C12, C13, C14, C9
R3, R4	Options for single-ended IF output circuit.
R15, 16
R6, C11	RBIAS resistor that sets the bias current for the mixer core. The capacitor
	provides ac bypass for R6.
R8	Pull down for the PWDN pin.
R9	Link to PWDN pin.
C3, R5, C16, L1	RF input. C3 provides dc block for RF input. R5 provides a resistive input
	termination. C16 and L1 are provided for reactive matching the input.
C1	RF common ac coupling. Provides dc block for RF input common
	connection.
C8	LO input ac coupling. Provides dc block for the LO input.
C7	LO common ac coupling. Provides dc block for LO input common
	connection.
W1	Power down. The part is on when the PWDN is connected to ground via a
	10 kΩ resistor. The part is disabled when PWDN is connected to the positive
	supply (VS) via W1.
T1, R12, R11, Z3,	IF output interface. T1 converts a differential high impedance IF output to
Z4, Z1, Z2, R10	single-ended. When loaded with 50 Ω, this balun presents a 100 Ω load to
	the mixers collectors. The center tap of the primary is used to supply the
	bias voltage (VS) to the IF output pins.

Default Conditions

R1, R2, R7 = 0 Ω C4, C6 = 1000 pF C10, C13 = 100 pF

C2, C5, C12, C9 = 0.1 µF R3, R4 = Open Ω

R15, R16 = 0 Ω

R6 = 1.82 kΩ

C11 = 100 pF

R8 = 10 kΩ

R9 = 0 Ω

C3 = 1000 pF

R5 = 100 Ω

C14 = Open

L1 = 0 Ω

C1 = 1000 pF

C7, C8 = 1000 pF

T1 = TC2-1T, 2:1 (Mini-Circuits)

R12 = Open Ω

R10, R11 = 0 Ω

Z3, Z4 = Open

Z1, Z2 = Open

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