DAC39RF10 datasheet(134/232 Pages) TI2

134 / 232 page

7.5 Programming

The device contains two programming interfaces: a SPI interface and a Fast Reconfiguration (FR) interface for

fast programming of NCO frequency and phase.

7.5.1 Using the Standard SPI Interface

The standard SPI interface is accessed using the following four pins: serial clock (SCLK), serial data in (SDI),

serial data out (SDO), and serial interface chip-select ( SCS). Register access is enabled through the SCS pin.

7.5.1.1 SCS

This signal must be asserted low to access a register through the serial interface. Setup and hold times with

respect to the SCLK must be observed.

7.5.1.2 SCLK

Serial data input is accepted at the rising edge of this signal. SCLK has no minimum frequency requirement.

7.5.1.3 SDI

Each register access requires a specific 24-bit pattern at this input. This pattern consists of a read-and-write

(R/W) bit, register address, and register value. The data are shifted in MSB first and multi-byte registers are

always in little-endian format (least significant byte stored at the lowest address). Setup and hold times with

respect to the SCLK must be observed (see the Switching Characteristics table).

7.5.1.4 SDO

The SDO signal provides the output data requested by a read command. This output is high impedance during

write bus cycles and during the read bit and register address portion of read bus cycles.

7.5.1.5 Serial Interface Protocol

As shown in Figure 7-58, each register access consists of 24 bits. The first bit is high for a read and low for a

write.

The next 15 bits are the address of the register that is to be written to. During write operations, the last eight bits

are the data written to the addressed register. During read operations, the last eight bits on SDI are ignored and,

during this time, the SDO outputs the data from the addressed register. Figure 7-58 shows the serial protocol

details.

SCLK

Single Register Access

SCS

SDI

Command Field

Data Field

SDO

(read mode)

Data Field

High Z

A14

A13

A12

A11

A10

R/W

Figure 7-58. Serial Interface Protocol: Single Read and Write

DAC39RF10-SP, DAC39RF10-SEP

DAC39RFS10-SP, DAC39RFS10-SEP

SBAS932A – MARCH 2024 – REVISED FEBRUARY 2026

www.ti.com

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DAC39RF10 Datasheet(PDF) 134 Page - Texas Instruments

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