Datasheet

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ADS6245 , ADS6244
ADS6243 , ADS6242
SLAS542A – MAY 2007 – REVISED JULY 2007
PIN ASSIGNMENTS (1-WIRE INTERFACE) (continued)
PINS
NO. OF
I/O DESCRIPTION
PINS
NAME NO.
This pin functions as serial interface clock input when RESET is low.
When RESET is high, it controls DESKEW, SYNC and global POWER DOWN modes
SCLK 34 I 1
(along with SDATA). See 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 modes
SDATA 33 I 1
(along with SCLK). See 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 32 I 1
See 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 software reset
RESET 4 I 1 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.
PDNA 31 I 1 Channel A ADC power down control pin.
PDNB 30 I 1 Channel B ADC power down control pin.
Parallel input pin. It controls 1-wire or 2-wire interface and DDR or SDR bit clock
CFG1 23 I 1 selection. See Table 9 for description.
Tie to ground for 1-wire interface with DDR bit clock.
Parallel input pin. It controls 12x or 14x serialization and SDR bit clock capture edge.
CFG2 22 I 1 See Table 10 for description.
For 12x serialization with DDR bit clock, tie to ground or AVDD.
CFG3 21 I 1 RESERVED pin - Tie to ground.
Parallel input pin. It controls data format and MSB or LSB first modes. See Table 12 for
CFG4 15 I 1
description.
Internal reference mode – common-mode voltage output
VCM 16 IO 1 External reference mode – reference input. The voltage forced on this pin sets the
internal reference.
OUTPUT PINS
DA_P,DA_M 45,46 O 2 Channel A differential LVDS data output pair
DB_P,DB_M 39,40 O 2 Channel B differential LVDS data output pair
DCLKP,DCLKM 43,44 O 2 Differential bit clock output pair
FCLKP,FCLKM 41,42 O 2 Differential frame clock output pair
UNUSED 37,38,47,48 4 These pins are unused in the 1-wire interface. Do not connect
NC 14 1 Do not connect
Connect to ground using multiple vias. Refer to Board Design Considerations in
PAD 0 1
application section.
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