CONTROL OR SERIAL |
SCLK |
43 |
I |
Serial interface clock. Internal pulldown. |
SDENB |
42 |
I |
Serial data enable. Internal pullup. |
SDIO |
44 |
I/O |
Bi-directional serial data in 3 pin mode (default). In 4-pin interface mode (register sif4_ena (config 0, bit 9)), the SDIO pin in an input only. Internal pulldown. |
SDO |
46 |
O |
Uni-directional serial interface data in 4 pin mode (register sif4_ena (config 0, bit 9)). The SDO pin is tri-stated in 3-pin interface mode (default). Internal pulldown. |
RESETB |
41 |
I |
Serial interface reset input. Active low. Initialized internal registers during high to low transition. Asynchronous. Internal pullup. A reset event after every power cycle may be needed to reinitialize all SPI registers to their default values.
|
ALARM |
47 |
O |
CMOS output for ALARM condition. |
TXENABLE |
48 |
I |
Transmit enable active high input. TXENABLE must be high for the DATA to the DAC to be enabled. When TXENABLE is low, the digital logic section is forced to all 0, and any input data is ignored. Internal pulldown. |
SLEEP |
49 |
I |
Puts device in sleep, active high. Internal pulldown. |
DATA INTERFACE |
DATA[9:0]P,
DATA[9:0]N |
9, 10, 19,
20, 22, 23,
26, 27, 29,
30, 31, 32 |
I |
LVDS input data bits for both channels. Each positive or negative LVDS pair has an internal 100-Ω termination resistor. The data format relative to DATACLKP and DATACLKN clock is Double Data Rate (DDR) with two data transfers per DATACKP and DATACKN clock cycle. |
The data format is interleaved with channel A (rising edge) and channel B (falling edge). |
In the default mode (reverse bus not enabled): |
DATA13P and DATA13N are most significant data bit (MSB) |
DATA0P and DATA0N are least significant data bit (LSB) |
DATACLKP,
DATACLKN |
24, 25 |
I |
DDR differential input data clock. Edge to center nominal timing. Channel A rising edge, channel B falling edge in multiplexed output mode. |
SYNCP,
SYNCN |
6, 7 |
I |
Reset the FIFO or to be used as a syncing source. These two functions are captured with the rising edge of DATACLKP and DATACLKN. The signal captured by the falling edge of DATACLKP and DATACLKN. |
ALIGNP,
ALIGNN |
4, 5 |
I |
LVPECL FIFO output synchronization. This positive and negative pair is captured with the rising edge of DACCLKP and DACCLKN. It is used to reset the clock dividers and for multiple DAC synchronization. If unused it can be left unconnected. |
OUTPUT OR CLOCK |
DACCLKP,
DACCLKN |
1, 2 |
I |
LVPECL clock input for DAC core with a self-bias of approximately CLKVDD18 / 2.
|
IOUTAP,
IOUTAN |
61, 60 |
O |
A-channel DAC current output. An offset binary data pattern of 0x0000 at the DAC input results in a full scale current source and the most positive voltage on the IOUTAP pin. Similarly, a 0xFFFF data input results in a 0 mA current source and the least positive voltage on the IOUTAP pin. |
REFERENCE |
EXTIO |
58 |
I/O |
Used as external reference input when internal reference is disabled. Requires a 0.1-µF decoupling capacitor to GND when used as reference output. |
BIASJ |
57 |
O |
Full-scale output current bias. For 20-mA full-scale output current, connect a 960-Ω resistor to GND. |
POWER SUPPLY |
IOVDD |
45 |
I |
Supply voltage for CMOS IO’s. 1.8 V to 3.3 V. |
CLKVDD18 |
3 |
I |
1.8 V clock supply |
DIGVDD18 |
21, 28 |
I |
1.8 V digital supply. Also supplies LVDS receivers. |
VDDA18 |
50, 64 |
I |
Analog 1.8 V supply |
VDDA33 |
55, 56, 59 |
I |
Analog 3.3 V supply |
VFUSE |
8 |
I |
Digital supply voltage. (1.8 V) This supply pin is also used for factory fuse programming. Connect to DVDD pins for normal operation. |
NC |
33, 34, 39,
40, 51, 52,
53, 54,
62, 63 |
– |
Not used. These pins can be left open or tied to GROUND in actual application use. It is recommended to turn off pin 33-40 (register lvdsdata_ena) to save power. |