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AD9523-1
Rev. B | Page 14 of 60
Pin
No.
Mnemonic
Description
11
LF2_EXT_CAP
O
PLL2 External Loop Filter Capacitor Connection. Connect capacitor to this pin and the LDO_VCO pin.
12
LDO_VCO
P/O
2.5 V LDO Internal Regulator Decoupling Pin for VCO. Connect a 0.47 μF decoupling capacitor from
this pin to ground. Note that, for best performance, the LDO bypass capacitor must be placed in close
proximity to the device.
13
VDD3_VCO
P
3.3 V Supply for VCO and VCO M1 Divider.
14
LDO_DIV_M1
P/O
1.8 V LDO Regulator Decoupling Pin for VCO Divider M1. Connect a 0.47 μF decoupling capacitor
from this pin to ground. Note that, for best performance, the LDO bypass capacitor must be placed
in close proximity to the device.
15
PD
I
Chip Power-Down, Active Low. This pin has an internal 40 kΩ pull-up resistor.
16
REF_SEL
I
Reference Input Select. This pin has an internal 40 kΩ pull-down resistor.
17
SYNC
I
Manual Synchronization. This pin initiates a manual synchronization and has an internal 40 kΩ pull-
up resistor.
18
VDD3_REF
P
3.3 V Supply for Output Clock Drivers Reference and VCO Divider M2.
19
RESET
I
Digital Input, Active Low. Resets internal logic to default states. This pin has an internal 40 kΩ pull-up
resistor.
20
CS
I
Serial Control Port Chip Select, Active Low. This pin has an internal 40 kΩ pull-up resistor.
21
SCLK/SCL
I
Serial Control Port Clock Signal for SPI Mode (SCLK) or I2C Mode (SCL). Data clock for serial program-
ming. This pin has an internal 40 kΩ pull-down resistor in SPI mode but is high impedance in IC mode.
22
SDIO/SDA
I/O
Serial Control Port Bidirectional Serial Data In/Data Out for SPI Mode (SDIO) or IC Mode (SDA).
23
SDO
O
Serial Data Output. Use this pin to read data in 4-wire mode (high impedance in 3-wire mode). There
is no internal pull-up/pull-down resistor on this pin.
24
REF_TEST
I
Test Input to PLL1 Phase Detector.
25
OUT13
O
Complementary Square Wave Clocking Output 13. This pin can be configured as one side of
a differential LVPECL/LVDS/HSTL output or as a single-ended CMOS output.
26
OUT13
O
Square Wave Clocking Output 13. This pin can be configured as one side of a differential LVPECL/
LVDS/HSTL output or as a single-ended CMOS output.
27
VDD3_OUT[12:13]
P
3.3 V Supply for Output 12 and Output 13 Clock Drivers.
28
OUT12
O
Complementary Square Wave Clocking Output 12. This pin can be configured as one side of
a differential LVPECL/LVDS/HSTL output or as a single-ended CMOS output.
29
OUT12
O
Square Wave Clocking Output 12. This pin can be configured as one side of a differential LVPECL/
LVDS/HSTL output or as a single-ended CMOS output.
30
VDD1.8_OUT[12:13]
P
1.8 V Supply for Output 12 and Output 13 Clock Dividers.
31
OUT11
O
Complementary Square Wave Clocking Output 11. This pin can be configured as one side of
a differential LVPECL/LVDS/HSTL output or as a single-ended CMOS output.
32
OUT11
O
Square Wave Clocking Output 11. This pin can be configured as one side of a differential LVPECL/
LVDS/HSTL output or as a single-ended CMOS output.
33
VDD3_OUT[10:11]
P
3.3 V Supply for Output 10 and Output 11 Clock Drivers.
34
OUT10
O
Complementary Square Wave Clocking Output 10. This pin can be configured as one side of
a differential LVPECL/LVDS/HSTL output or as a single-ended CMOS output.
35
OUT10
O
Square Wave Clocking Output 10. This pin can be configured as one side of a differential LVPECL/
LVDS/HSTL output or as a single-ended CMOS output.
36
VDD1.8_OUT[10:11]
P
1.8 V Supply for Output 10 and Output 11 Clock Dividers.
37
OUT9
O
Complementary Square Wave Clocking Output 9. This pin can be configured as one side of
a differential LVPECL/LVDS/HSTL output or as a single-ended CMOS output.
38
OUT9
O
Square Wave Clocking Output 9. This pin can be configured as one side of a differential LVPECL/
LVDS/HSTL output or as a single-ended CMOS output.
39
VDD3_OUT[8:9]
P
3.3 V Supply for Output 8 and Output 9 Clock Drivers.
40
OUT8
O
Complementary Square Wave Clocking Output 8. This pin can be configured as one side of
a differential LVPECL/LVDS/HSTL output or as a single-ended CMOS output.
41
OUT8
O
Square Wave Clocking Output 8. This pin can be configured as one side of a differential LVPECL/
LVDS/HSTL output or as a single-ended CMOS output.
42
VDD1.8_OUT[8:9]
P
1.8 V Supply for Output 8 and Output 9 Clock Dividers.
43
OUT7
O
Complementary Square Wave Clocking Output 7. This pin can be configured as one side of
a differential LVPECL/LVDS/HSTL output or as a single-ended CMOS output.
44
OUT7
O
Square Wave Clocking Output 7. This pin can be configured as one side of a differential LVPECL/
LVDS/HSTL output or as a single-ended CMOS output.