Datasheet
AD9954
Rev. B | Page 36 of 40
EVALUATION BOARD SCHEMATICS
C1
0.1µF
C2
0.1µF
C3
0.1µF
C8
0.1µF
C11
0.1µF
C4
0.1µF
C5
0.1µF
C36
39pF
C35
39pF
C6
0.1µF
C7
0.1µF
GND
AVDD
C10
0.1µF
C12
0.1µF
GND
DVDD
C9
0.1µF
C46
7.5pF
C43
33pF
C33
SEE
NOTE 2
C38
33pF
C41
22pF
R14
50Ω
C42
39pF
C45
22pF
C44
39pF
C39
7.5pF
C37
22pF
C40
39pF
L6
20nH
L4
18nH
L5
12nH
L8
20nH
L7
18nH
L9
12nH
GND
DVDD_I/O
RESET_DUT1
PWRDWNCTRL_DUT1
DVDD
GND
GND
36
35
34
33
32
31
30
29
28
27
26
25
1
2
3
4
3
1
5
4
5
6
7
8
9
10
11
12
4
AVDD
5
6
3
2
1
AVDD
AVDD
AVDD
GND
AD9954
U7
DUT 1
J5
COMP_OUT_DUT1
FUD_DUT1
DVDD
GND
AVDD
GND
GND
AVDD
XTAL_DUT2
CLKMODESEL_DUT1
J2
W1
4
12
3
48
47
46
45
44
43
42
41
40
39
38
37
PS1_DUT1
PS0_DUT1
OSK_DUT1
SYNCMULTI_DUT2
SYNCMULTI_DUT1
DVDD_I/O
GND
SDIO
SCLK
CSB_DUT1
I/O_SYNC_DUT1
SDO
13
14
15
16
17
18
19
20
21
22
23
24
AVDD
AVDD
AVDD
GND
GND
AVDD
GND
GND
AVDD
AVDD
GND
NOTE 2
NOTE 1
NOTE 4
NOTE 3
GND AVDD
FILTER_IN_DUT1
J1
FILTER_OUT_DUT1
J3
REF_CLK_DUT1
BALUN
T1
J4
CRYSTAL OUT
DUT2
GND
GND
XTAL_DUT2
×1 25MHz
NOTES
1. THE FULL-SCALE DAC OUTPUT CURRENT IS CONTROLLED BY MEANS OF AN EXTERNAL
RESISTANCE (R
SET
) CONNECTED BETWEEN THE DAC_R
SET
PIN AND GROUND. RESISTOR
VALUES FOR FULL-SCALE CURRENTS ARE: 3.92kΩ = 10mA, 5.23kΩ = 7.5mA, 7.87kΩ = 5.0mA,
15.8kΩ = 2.5mA.
2. C33 IS USED FOR A SIMULATED CAPACITANCE LOAD FOR THE COMPARATOR OUT. THE
CAPACITANCE VALUE SHOULD NOT EXCEED 10pF.
3. CAPACITORS C48 AND C49 SHOULD BE SOLDERED IN PLACE WHEN THE REF_CLK_DUT1
INPUT IS USED. CAPACITORS C35 AND C36 SHOULD BE SOLDERED IN PLACE WHEN
CRYSTAL ×1 IS USED IN CONJUNCTION WITH THE INTERNAL OSCILLATOR.
4. USE EITHER RESISTORS R4 AND R5 (COMPARATOR INPUTS) OR R6 AND R7 (FILTERED
OUTPUT) FOR THE IOUT AND IOUT. DO NOT USE BOTH SETS AT THE SAME TIME.
RESET
PWRDWNCTL
DVDD
DGND
AGND
COMP_IN
COMP_IN
AVDD
COMP_OUT
AVDD
AVDD
AGND
I/O UPDATE
DVDD
DGND
AVDD
AGND
AGND
AVDD
OSC/REFCLK
OSC/REFCLK
CRYSTAL OUT
CLKMODESELECT
LOOP_FILTER
PS1
PS0
OSK
SYNC_CLK
SYNC_IN
DVDD_I/O
DGND
SDIO
SCLK
CS
IOSYNC
SDO
AVDD
AGND
AGND
AVDD
AGND
AVDD
AVDD
IOUT
IOUT
AGND
DAC_R
SET
DACBP
C47
1µF
R10
3.92kΩ
R5
0Ω
R4
0Ω
R8
25Ω
R3
243Ω
R6
0Ω
R1
50Ω
R9
25Ω
R7
0Ω
C30
13pF
C50
13pF
L1
39nH
C31
27pF
C52
6.8pF
L2
56nH
C29
33pF
C32
22pF
C51
2.2pF
L3
68nH
C34
0.01µF
C49
0.1µF
C48
0.1µF
03374-033
Figure 35. Evaluation Board Channel 1