Data Sheet
AD9520-2
Rev. A | Page 19 of 80
Pin No.
Input/
Output
Pin
Type
Mnemonic
Description
15
I
3.3 V CMOS
CS
Serial Control Port Chip Select; Active Low. This pin has an internal 30 k pull-up
resistor.
16
I
3.3 V CMOS
SCLK/SCL
Serial Control Port Clock Signal. This pin has an internal 30 k pull-down resistor in
SPI mode but is high impedance in IC mode.
17
I/O
3.3 V CMOS
SDIO/SDA
Serial Control Port Bidirectional Serial Data In/Out.
18
O
3.3 V CMOS
SDO
Serial Control Port Unidirectional Serial Data Out.
19, 59
I
GND
Ground Pins.
20
I
Three-level
logic
SP1
Select SPI or IC as the serial interface port and select the IC slave address in IC
mode. Three-level logic. This pin is internally biased for the open logic level.
21
I
Three-level
logic
SP0
Select SPI or IC as the serial interface port and select the IC slave address in IC
mode. Three-level logic. This pin is internally biased for the open logic level.
22
I
3.3 V CMOS
EEPROM
Setting this pin high selects the register values stored in the internal EEPROM to be
loaded at reset and/or power-up. Setting this pin low causes th
e AD9520 to load
the hard-coded default register values at power-up/reset (unless Register 0xB02[1]
pull-down resistor. Note that, to guarantee proper loading of the EEPROM during
startup, a high-low-high pulse on the RESET pin should occur after the power supply
has stabilized.
23
I
3.3 V CMOS
RESET
Chip Reset, Active Low. This pin has an internal 30 k pull-up resistor.
24
I
3.3 V CMOS
PD
Chip Power-Down, Active Low. This pin has an internal 30 k pull-up resistor.
25
O
LVPECL or
CMOS
OUT9 (OUT9A)
Clock Output. This pin can be configured as one side of a differential LVPECL
output or as a single-ended CMOS output.
26
O
LVPECL or
CMOS
OUT9 (OUT9B)
Clock Output. This pin can be configured as one side of a differential LVPECL
output or as a single-ended CMOS output.
27, 35,
46, 54
I
Power
VS_DRV
Output Driver Power Supply Pins. As a group, these pins can be set to either 2.5 V
or 3.3 V. All four pins must be set to the same voltage.
28
O
LVPECL or
CMOS
OUT10 (OUT10A)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
29
O
LVPECL or
CMOS
OUT10 (OUT10B)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
30
O
LVPECL or
CMOS
OUT11 (OUT11A)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
31
O
LVPECL or
CMOS
OUT11 (OUT11B)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
33
O
LVPECL or
CMOS
OUT6 (OUT6A)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
34
O
LVPECL or
CMOS
OUT6 (OUT6B)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
36
O
LVPECL or
CMOS
OUT7 (OUT7A)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
37
O
LVPECL or
CMOS
OUT7 (OUT7B)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
38
O
LVPECL or
CMOS
OUT8 (OUT8A)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
39
O
LVPECL or
CMOS
OUT8 (OUT8B)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
42
O
LVPECL or
CMOS
OUT5 (OUT5B)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
43
O
LVPECL or
CMOS
OUT5 (OUT5A)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
44
O
LVPECL or
CMOS
OUT4 (OUT4B)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.
45
O
LVPECL or
CMOS
OUT4 (OUT4A)
Clock Output. This pin can be configured as one side of a differential LVPECL output
or as a single-ended CMOS output.