ADS9217 datasheet(5/68 Pages) TI2

5 / 68 page

Pin Functions (continued)

TYPE(1)

DESCRIPTION

NAME

NO.

DOUTM

Negative differential data output. Connect a 100Ω resistor between DOUTP and

DOUTM close to the receiver.

DOUTP

Positive differential data output. Connect a 100Ω resistor between DOUTP and

DOUTM close to the receiver.

FCLKM

Negative differential data frame clock output. Connect a 100Ω resistor between

FCLKP and FCLKM close to the receiver.

FCLKP

Positive differential data frame clock output. Connect a 100Ω resistor between

FCLKP and FCLKM close to the receiver.

GND

2, 7, 8, 9, 11, 12,

15, 34, 38

Ground.

25, 26

–

No external connection. Leave floating.

PWDN

Power-down control; active low. Connect to VDD_1V8 if unused.

REFIO

I/O

Internal reference voltage output. External reference voltage input. Connect a 10μF

decoupling capacitor to REFM.

REFM

6, 40

Reference ground. Connect to GND.

RESET

Reset input; active low. Connect to VDD_1V8 if unused.

SCLK

Serial clock input for the interface configuration.

SDI/EXTREF

SDI is a multifunction logic input; pin function is determined by the SPI_EN pin. SDI

has an internal 100kΩ pulldown resistor to GND. SPI_EN = 0b: SDI is the logic

input to select between the internal or external reference. Connect SDI to GND for

the external reference. Connect SDI to IOVDD for the internal reference. SPI_EN =

1b: Serial data input for the interface configuration.

SDO

Serial data output for the configuration interface.

SMPL_CLKM

ADC sampling clock input. Negative differential input for the LVDS sampling clock.

Connect this pin to GND for the CMOS sampling clock.

SMPL_CLKP

ADC sampling clock input. Positive differential input for the LVDS sampling clock.

Clock input for the CMOS sampling clock.

SMPL_SYNC

Synchronization input for internal averaging filter.

Connect to GND if unused. See the Synchronizing Multiple ADCs section on how

to use the SMPL_SYNC pin.

SPI_EN

Control to enable the SPI configuration; active high.

Connect a pullup resistor to VDD_1V8 to keep the configuration interface enabled.

Connect to GND if the SPI configuration is unused.

Thermal Pad

—

Exposed thermal pad. Connect to GND.

VCMOUT

Common-mode voltage output. Use VCMOUT to set the common-mode voltage at

the ADC inputs. Connect a 1μF decoupling capacitor to GND.

VDD_1V8

13, 14, 35, 36, 37

1.8V power-supply. Connect 1μF and 0.1μF decoupling capacitors to GND.

(1)

I = input, O = output, I/O = input or output, G = ground, P = power.

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