AK8181B

AKD8181B
AKD8181B
AK8181B Evaluation Board
The AKD8181B is an evaluation board for AK8181B. Therefore, it is easy to evaluate DC/AC
characteristics and confirm product functions.
-
SMA terminal input
Crystal can be mounted
Enable to construct three types of output load circuit
Preparing terminal and land pattern for VDD/VEE
CLK_SEL and CLK_EN control switch
VDD
【P
VDD-2V
VEE
CLK_SEL
CLK_EN
Output pin
Q0/Q0n
CLK input
Output pin
Q1/Q1n
Output pin
Q2/Q2n
Crystal
Output pin
Q3/Q3n
【P
AKD8181B-E-00
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AKD8181B
Power
There are the following three power supplies.
※If you have configured a termination circuit with resistor only (Pattern A or B), it becomes possible to
evaluate even without applying power to the VDD-2V terminal.
The core power supply of AK8181B (3.3V)
- VDD
The core power supply of AK8181B (GND)
- VEE
Power supply for the end of the output load resistor (=VDD-2V)
- VDD-2V
Note) GND of the SMA terminal is connected to the VEE inside the substrate.
Clock input
AK8181B inputs the clock selected by CLK_SEL switch. (External input or crystal)
The clock input signal can terminate at 50Ω if needed. (50Ω is connected to R2 pattern)
Inputs 266MHz or less.
Output load circuit
It can terminate by the following three methods. (Pattern A/B/C)
The state of initial shipment is 【Pattern A】.
【Pattern A】
※Composition at the time of shipment
0Ω
Q0,1,2,3
Zo=50Ω
RTT
50Ω
NC
50Ω
NC
0.1uF
or Open
Q0N,1N,
2N,3N
Zo=50Ω
0Ω


1
RTT  
Z0


(
V

V
)
/(
V

2
)

2
OL
CC
 OH

NC:No components
※RTT: 50Ω is mounted at the time of shipment
【Pattern B】
0Ω
Q0,1,2,3
Zo=50Ω
84Ω
125Ω
84Ω
125Ω
short
Q0N,1N,
2N,3N
AKD8181B-E-00
Zo=50Ω
0Ω
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AKD8181B
【Pattern C】
s possible to
50Ω
Q0,1,2,3
Zo=50Ω
NC
NC
NC
NC
short
NC
Q0N,1N,
2N,3N
Zo=50Ω
VDD-2V
short
50Ω
※Please impress a power to VDD-2V terminal.
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AKD8181B
According to the circumstances, please set up the output
load circuit of Q0/0N, Q1/1N, Q2/2N and Q3/3N.
The state of initial shipment is 【Pattern A】.
(Refer to the "Output load circuit" at page 2. )
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