Datasheet

DRV2667

SLOS751A –MARCH 2013–REVISED JANUARY 2014

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ANALOG BYPASS MODE

When the Input_MUX bit is set, the DRV2667 will switch the analog inputs (IN+/IN-) to the high voltage amplifier.

While in the analog mode, the gain is still register-selectable. Also, the high-voltage amplifier enable is controlled

directly via the EN_Override bit, so the EN_Override bit must be set to for the boost and amplifier to be active.

LOW-POWER STANDBY MODE

The DRV2667 has a low-power standby mode via the I

C interface that puts the device in its lowest power state.

This mode is entered when the standby bit (STANDBY) is set from low to high. When the STANDBY bit is set

high, no other mode of operation is enabled. When the STANDBY bit is transitioned from high to low, the device

readied for operation and may receive data.

DEVICE RESET

The DRV2667 does not have a “RESET” pin, however it does have a register bit that provides the same

functionality. When the DEV_RST bit is set, the device will immediately stop any transaction in process, reset all

of its internal registers to their default values as well as put itself in the STANDBY mode.

GAIN CONTROL

The DRV2667 gain is user-programmable via I

C. The GAIN value determines the full-scale peak voltage during

digital playback, and the gain from IN+/IN– to OUT+/OUT– when using the analog inputs.

GAIN[1] GAIN[0] Full Scale Peak Voltage (V) Gain (dB) Analog Mode

0 0 25 28.8

0 1 50 34.8

1 0 75 38.4

1 1 100 40.7

The gains are optimized to achieve approximately 50 V

, 100 V

, 150 V

, or 200 V

without clipping from the

digital interface or from a 1.8 V supplied single-ended source through the analog interface. Note the boost

voltage should be programmed for the rated voltage of the actuator or below. The user should take care not to

select higher gains than necessary. Clipping of the amplifier will occur if the expected peak voltage is greater

than the boost converter output voltage (VBST).

ADJUSTABLE BOOST VOLTAGE

The output voltage of the integrated boost converter may be adjusted by a resistive feedback divider between the

boost output voltage (VBST) and the feedback pin (FB). The boost voltage should be programmed to a value

greater than the maximum peak signal voltage that the user expects to create with the device amplifier. Lower

boost voltages will achieve better system efficiency when lower amplitude signals are applied, so the user should

take care not to use a higher boost voltage than necessary. The maximum allowed boost voltage is 105V.

Product Folder Links: DRV2667