AD9508PCBZ datasheet(11/40 Pages) AD

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Data Sheet

AD9508

Rev. A | Page 11 of 40

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

Figure 2. Pin Configuration

Table 12. Pin Function Descriptions

Pin No.

Mnemonic

Description

CS/S2

Chip Select/Pin Programming. Multipurpose pin. This pin is controlled by the PROG_SEL pin. Chip

Select (CS) is an active logic low CMOS input used in the SPI operation mode. When programming a

device via SPI mode, CS must be held low. In systems where more than one AD9508 is present, this pin

enables individual programming of each AD9508. In pin programming mode, this pin becomes S2. In

this mode, S2 is hard wired with a resistor to either VDD or ground. The resistor value and resistor

biasing determine the channel divider value for the outputs on Pin 11 and Pin 12. See the Pin Strapping

to Program on Power-Up section for more details.

OUT0

LVDS/HSTL Differential Output or Single-Ended CMOS Output.

OUT0

Complementary LVDS/HSTL Differential Output or Single-Ended CMOS Output.

SDO/S3

Serial Data Output/Pin Programming. Multipurpose pin. This pin is controlled by the PROG_SEL pin.

SDO is configured as an output to read back the internal register settings in SPI mode operation. In pin

programming mode, this pin becomes S3, which is hard wired with a resistor to either VDD or ground.

The resistor value and resistor biasing determine the channel divider value for the outputs on Pin 16

and Pin 17. See the Pin Strapping to Program on Power-Up section for more details.

EXT_CAP0

Node for External Decoupling Capacitor for LDO. Tie this pin to a 0.47 μF capacitor to ground.

VDD

Power Supply (2.5 V or 3.3 V Operation).

OUT1

LVDS/HSTL Differential Output or Single-Ended CMOS Output.

OUT1

Complementary LVDS/HSTL Differential Output or Single-Ended CMOS Output.

Pin Programming. Use this pin in pin programming mode only. The PROG_SEL pin determines which

programming mode is used. In pin programming mode, S4 is hardwired with a resistor to either VDD or

ground. The resistor value and resistor biasing determine the output logic levels used for the outputs

on Pin 2, Pin 3, Pin 7, and Pin 8. See the Pin Strapping to Program on Power-Up section for more details.

Pin Programming. Use this pin in pin programming mode only. The PROG_SEL pin determines which

programming mode is used. In pin programming mode, S5 is hardwired with a resistor to either VDD or

ground. The resistor value and resistor biasing determine the output logic levels used for the outputs

on Pin 11, Pin 12, Pin 16, and Pin 17. See the Pin Strapping to Program on Power-Up section for more

details.

OUT2

LVDS/HSTL Differential Output or Single-Ended CMOS Output.

OUT2

Complementary LVDS/HSTL Differential Output or Single-Ended CMOS Output.

VDD

Power Supply (2.5 V or 3.3 V Operation).

EXT_CAP1

Node for External Decoupling Capacitor for LDO. Tie this pin to a 0.47 μF capacitor to ground.

PROG_SEL

Three-State CMOS Input. Pin 15 selects the type of device programming interface to be used (SPI, I2C,

or pin programming).

OUT3

LVDS/HSTL Differential Output or Single-Ended CMOS Output.

OUT3

Complementary LVDS/HSTL Differential Output or Single-Ended CMOS Output.

VDD

EXT_CAP0

SDO/S3

OUT0

CS/S2

VDD

NOTES

1. THE EXPOSED DIE PAD MUST BE CONNECTED

TO GROUND (VSS).

EXT_CAP1

PROG_SEL

OUT3

RESET

AD9508

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