ADS6445 datasheet(30/75 Pages) STMICROELECTRONICS

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ADS6445, ADS6444

ADS6443, ADS6442

SLAS531 – MAY 2007

PIN ASSIGNMENTS (1-WIRE INTERFACE) (continued)

PINS

NO. OF

I/O

DESCRIPTION

PINS

NAME

NO.

Differential input signal pair, channel A. If unused, the pins should be tied to VCM. Do

INA_P, INA_M

12,11

not float.

Differential input signal pair, channel B.If unused, the pins should be tied to VCM. Do

INB_P, INB_M

15,14

not float.

Differential input signal pair, channel C. If unused, the pins should be tied to VCM.

INC_P, INC_M

34,35

Do not float.

Differential input signal pair, channel D. If unused, the pins should be tied to VCM.

IND_P, IND_M

37,38

Do not float.

CAP

Connect 2-nF capacitance from pin to ground

This pin functions as serial interface clock input when RESET is low.

When RESET is high, it controls DESKEW, SYNC and global POWER DOWN

SCLK

modes (along with SDATA). Refer to Table 5 for description.

This pin has an internal pull-down resistor.

This pin functions as serial interface data input when RESET is low.

When RESET is high, it controls DESKEW, SYNC and global POWER DOWN

SDATA

modes (along with SCLK). Refer to Table 5 for description.

This pin has an internal pull-down resistor.

This pin functions as serial interface enable input when RESET is low.

When RESET is high, it controls coarse gain and internal/external reference modes.

SEN

Refer to Table 6 for description.

This pin has an internal pull-up resistor.

Serial interface reset input.

When using the serial interface mode, the user MUST initialize internal registers

through hardware RESET by applying a high-going pulse on this pin or by using

RESET

software reset option. Refer to the Serial Interface section. In parallel interface mode,

tie RESET permanently high. (SCLK, SDATA and SEN function as parallel control

pins in this mode).

The pin has an internal pull-down resistor to ground.

PDN

Global power down control pin.

Parallel input pin. It controls 1-wire or 2-wire interface and DDR or SDR bit clock

CFG1

selection. Refer to Table 8 for description.

Tie to ground for 1-wire interface with DDR bit clock.

Parallel input pin. It controls 14x or 16x serialization and SDR bit clock capture edge.

CFG2

Refer to Table 9 for description.

For 14x serialization with DDR bit clock, tie to ground or AVDD.

CFG3

RESERVED pin - Tie to ground.

Parallel input pin. It controls data format and MSB or LSB first modes. Refer to

CFG4

Table 11 for description.

Internal reference mode – common-mode voltage output

VCM

I/O

External reference mode – reference input. The voltage forced on this pin sets the

internal reference.

OUTPUT PINS

DA_P,DA_M

62,63

Channel A differential LVDS data output pair

DB_P,DB_M

60,61

Channel B differential LVDS data output pair

DC_P,DC_M

52,53

Channel C differential LVDS data output pair

DD_P,DD_M

50,51

Channel D differential LVDS data output pair

DCLKP,DCLKM

57,58

Differential bit clock output pair

FCLKP,FCLKM

55,56

Differential frame clock output pair

UNUSED

1-4,45-48

These pins are unused in the 1-wire interface. Do not connect

Do not connect

Connect to ground plane using multiple vias. Refer to Board Design Considerations

PAD

in the application section.

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