Datasheet

www.ti.com
Parallel Interface
Cross-Reference
DAC7821
SBAS365B – OCTOBER 2005 – REVISED JULY 2007
Data are loaded to the DAC7821 as a 12-bit parallel word. The bidirectional bus is controlled with CS and R/ W,
allowing data to be written to or read from the DAC register. To write to the device, CS and R/ W are brought
low, and data available on the data lines fill the input register. The rising edge of CS latches the data and
transfers the latched data-word to the DAC register. The DAC latches are not transparent; therefore, a write
sequence must consist of a falling and rising edge on CS in order to ensure that data are loaded to the DAC
register and its analog equivalent is reflected on the DAC output.
To read data stored in the device, R/ W is held high and CS is brought low. Data are loaded from the DAC
register back to the input register and out onto the data line, where it can be read back to the controller.
The DAC7821 has an industry-standard pinout. Table 3 provides the cross-reference information.
Table 3. Cross-Reference
SPECIFIED
TEMPERATURE PACKAGE PACKAGE CROSS-
PRODUCT INL (LSB) DNL (LSB) RANGE DESCRIPTION OPTION REFERENCE PART
DAC7821 ± 1 ± 1 –40 ° C to +125 ° C 20-Lead TSSOP TSSOP-20 AD5445
16
Submit Documentation Feedback