AVDD33 |
37, 40, 42, 45, 48 |
I |
Analog supply voltage. (3.3 V) |
ALARM_SDO |
34 |
O |
1.8V CMOS output for ALARM condition. The ALARM output functionality is defined through the CONFIG6 register. Default polarity is active low, but can be changed to active high via CONFIG0 alarm_pol control bit. Optionally, it can be used as the uni-directional data output in 4-pin serial interface mode (CONFIG 23 sif4_ena = '1'). |
BIASJ |
43 |
O |
Full-scale output current bias. For 20mA full-scale output current, connect a 960Ω resistor to GND. |
CLKVDD18 |
1, 35 |
I |
Internal clock buffer supply voltage. (1.8 V) It is recommended to isolate this supply from DACVDD18 and DIGVDD18. |
D[7..0]P |
9, 11, 13, 15, 21, 23, 25, 27 |
I |
LVDS positive input data bits 0 through 7. Each positive/negative LVDS pair has an internal 100 Ω termination resistor. Data format relative to DATACLKP/N clock is Double Data Rate (DDR) with two data transfers per DATACKP/N clock cycle. Dual channel 16-bit data is transferred byte-wide on this single 8-bit data bus using FRAMEP/N as a frame strobe indicator. |
|
D7P is most significant data bit (MSB) – pin 9 |
|
D0P is least significant data bit (LSB) – pin 27 |
The order of the bus can be reversed via CONFIG19 rev bit. |
D[7..0]N |
10, 12, 14, 16, 22, 24, 26, 28 |
I |
LVDS negative input data bits 0 through 15. (See D[7:0]P description above) |
|
D7N is most significant data bit (MSB) – pin 10 |
|
D0N is least significant data bit (LSB) – pin 28 |
DACCLKP |
3 |
I |
Positive external LVPECL clock input for DAC core with a self-bias of approximately CLKVDD18/2. |
DACCLKN |
4 |
I |
Complementary external LVPECL clock input for DAC core. (see the DACCLKP description) |
DACVDD18 |
2, 36 |
I |
DAC core supply voltage. (1.8 V) It is recommended to isolate this supply from CLKVDD18 and DIGVDD18. |
DATACLKP |
17 |
I |
LVDS positive input data clock. This positive/negative pair has an internal 100 Ω termination resistor. Input data D[7:0]P/N is latched on both edges of DATACLKP/N (Double Data Rate) with two data transfers input per DATACLKP/N clock cycle. |
DATACLKN |
18 |
I |
LVDS negative input data clock. (See DATACLKP description) |
DIGVDD18 |
8, 29 |
I |
Digital supply voltage. (1.8V) It is recommended to isolate this supply from CLKVDD18 and DACVDD18. |
EXTIO |
44 |
I/O |
Used as external reference input when internal reference is disabled through CONFIG25 extref_ena = '1'. Used as internal reference output when CONFIG25 extref_ena = '0' (default). Requires a 0.1µF decoupling capacitor to AGND when used as reference output. |
FRAMEP |
19 |
I |
LVDS frame indicator positive input. This positive/negative pair has an internal 100Ω termination resistor. This signal is captured with the rising edge of DATACLKP/N and used to indicate the beginning of the frame. It is also used as a reset signal by the FIFO. The FRAMEP/N signal should be edge-aligned with D[7:0]P/N. |
FRAMEN |
20 |
I |
LVDS frame indicator negative input. (See the FRAMEN description) |
GND |
5, Thermal Pad |
I |
Pin 5 and the Thermal Pad located on the bottom of the QFN package is ground for all supplies. |
IOUTA1 |
38 |
O |
A-Channel DAC current output. An offset binary data pattern of 0x0000 at the DAC input results in a full scale current sink and the least positive voltage on the IOUTA1 pin. Similarly, a 0xFFFF data input results in a 0 mA current sink and the most positive voltage on the IOUTA1 pin. |
IOUTA2 |
39 |
O |
A-Channel DAC complementary current output. The IOUTA2 has the opposite behavior of the IOUTA1 described above. An input data value of 0x0000 results in a 0 mA sink and the most positive voltage on the IOUTA2 pin. |
IOUTB1 |
47 |
O |
B-Channel DAC current output. Refer to IOUTA1 description above. |
IOUTB2 |
46 |
O |
B-Channel DAC complementary current output. Refer to IOUTA2 description above. |
OSTRP |
6 |
I |
LVPECL output strobe positive input. This positive/negative pair is captured with the rising edge of DACCLKP/N. It is used to reset the clock dividers and for multiple DAC synchronization. If unused it can be left floating. |
OSTRN |
7 |
I |
LVPECL output strobe negative input. (See the OSTRP description) |
SCLK |
32 |
I |
1.8V CMOS serial interface clock. Internal pull-down. |
SDENB |
33 |
I |
1.8V CMOS active low serial data enable, always an input to the DAC3283. Internal pull-up. |
SDIO |
31 |
I/O |
1.8V CMOS serial interface data. Bi-directional in both 3-pin mode (default) and 4-pin mode. Internal pull-down. |
TXENABLE |
30 |
I |
1.8V CMOS 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 pull-down. |
VFUSE |
41 |
I |
Digital supply voltage. (1.8V) This supply pin is also used for factory fuse programming. Connect to DACVDD18 pins for normal operation. |