Datasheet
Data Sheet AD9558
Rev. B | Page 17 of 104
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
NOTES
1. NC = NO CONNECT. DO NOT CONNECT
TO THIS PIN.
2. THE EXPOSED
PAD MUST BE CONNECTED
TO GROUND (VSS).
09758-002
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
AVDD
OUT2
OUT2
OUT1
OUT1
AVDD
OUT5
OUT5
AVDD3
A
VDD3
OUT0
OUT0
AVDD
AVDD
AVDD3
LDO_VCO2
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
DVDD3
M6
M5
M4
M3
M2
M1
M0
DVDD
DVDD
REFB
REFB
DVDD3
DVDD3
REFD
REFD
1
2
3
4
5
6
7
8
9
10
1
1
12
13
14
15
16
IRQ
SCLK/SC
L
SDIO/SDA
SDO
CS
DVDD
A
VDD
XOA
XOB
A
VDD
NC
A
VDD
OUT4
OUT4
OUT3
OUT3
REFC
REFC
DVDD3
DVDD3
RE
FA
RE
FA
SYNC
M7
PINCONTRO
L
RESET
A
VDD
A
VDD
NC
A
VDD
NC
LF_VCO2
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
AD9558
TOP VIEW
(Not to Scale)
PIN 1
INDIC
A
TOR
Figure 2. Pin Configuration
Table 20. Pin Function Descriptions
Pin No. Mnemonic
Input/
Output Pin Type Description
1
IRQ O 3.3 V CMOS Interrupt Request Line.
2
SCLK/SCL I 3.3 V CMOS
Serial Programming Clock (SCLK) in SPI Mode. Data clock for serial programming.
Open-Collector Serial Clock Pin (SCL) in I
2
C Mode. Requires a pull-up resistor, usually
2.2 kΩ; the resistor size depends on the number of I
2
C devices on the bus.
3
SDIO/SDA
I/O
3.3 V CMOS
Serial Data Input/Output (SDIO) in SPI Mode. When the device is in 4-wire SPI mode,
data is written via this pin. In 3-wire SPI mode, both data reads and writes occur on
this pin. There is no internal pull-up/pull-down resistor on this pin.
Open-Collector Serial Data Pin (SDA) in I
2
C Mode. Requires a pull-up resistor, usually
2.2 kΩ; the resistor size depends on the number of I
2
C devices on the bus.
4 SDO O 3.3 V CMOS
Serial Data Output. Use this pin to read data in 4-wire mode. There is no internal pull-up/
pull-down resistor on this pin. This pin is high impedance in the default 3-wire mode.
5
AA
CS
EE
I 3.3 V CMOS
Chip Select (SPI), Active Low. When programming a device, this pin must be held low.
In systems where more than one AD9558 is present, this pin enables individual
programming of each AD9558. This pin has an internal 10 kΩ pull-up resistor.
6, 55, 56
DVDD I Power 1.8 V Digital Supply.
7
AVDD I Power 1.8 V Analog (SYSCLK) Power Supply.
8
XOA I
Differential
input
System Clock Input. XOA contains internal dc biasing and should be ac-coupled with
a 0.01 μF capacitor, except when using a crystal. If a crystal is used, connect the crystal
across XOA and XOB. Single-ended 1.8 V CMOS is also an option but can introduce
a spur if the duty cycle is not 50%. When using XOA as a single-ended input, connect
a 0.01 μF capacitor from XOB to ground.
9
XOB
I
Differential
input
Complementary System Clock Input. Complementary signal to XOA. XOB contains
internal dc biasing and should be ac-coupled with a 0.01 μF capacitor, except when
using a crystal. If a crystal is used, connect the crystal across XOA and XOB.
10
AVDD I Power 1.8 V Analog (VCO) Power Supply.
11
NC I No Connection. Do not connect to this pin.
12, 17,
22, 29,
30
AVDD I Power 1.8 V Analog (Output Driver) Power Supply.