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AD9953

Rev. A | Page 13 of 32

OUT

SET

DAC Output

The AD9953 incorporates an integrated 14-bit current output

DAC. Unlike most DACs, this output is referenced to AVDD,

not AGND.

Two complementary outputs provide a combined full-scale

output current (IOUT). Differential outputs reduce the amount of

common-mode noise that might be present at the DAC output,

offering the advantage of an increased signal-to-noise ratio. The

full-scale current is controlled by an external resistor (RSET)

connected between the DAC_RSET pin and the DAC ground

(AGND_DAC). The full-scale current is proportional to the

resistor value as follows:

The maximum full-scale output current of the combined DAC

outputs is 15 mA, but limiting the output to 10 mA provides the

best spurious-free dynamic range (SFDR) performance. The DAC

output compliance range is AVDD + 0.5 V to AVDD – 0.5 V.

Voltages developed beyond this range will cause excessive DAC

distortion and could potentially damage the DAC output circuitry.

Proper attention should be paid to the load termination to keep the

output voltage within this compliance range.

Serial IO Port

The AD9953 serial port is a flexible, synchronous serial

communications port that allows easy interface to many industry-

standard microcontrollers and microprocessors. The serial I/O port

is compatible with most synchronous transfer formats, including

both the Motorola 6905/11 SPI® and Intel® 8051 SSR protocols.

The interface allows read/write access to all registers that configure

the AD9953. MSB first or LSB first transfer formats are supported.

The AD9953’s serial interface port can be configured as a single pin

I/O (SDIO), which allows a 2-wire interface or two unidirectional

pins for in/out (SDIO/SDO), which in turn enables a 3-wire

interface. Two optional pins, IOSYNC and CS, enable greater

flexibility for system design in the AD9953.

The register map is listed in Table 5.

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