ADAR1000ACCZN-R7 datasheet(39/79 Pages) AD

39 / 79 page

Data Sheet

ADAR1000

APPLICATIONS INFORMATION

analog.com

Rev. B | 39 of 79

PA BIAS OUTPUT CONTROL

The four PA bias output voltages (PA_BIAS1, PA_BIAS2,

PA_BIAS3, and PA_BIAS4) are controlled by four separate DACs,

which in turn are controlled by a combination of inputs (note that

some inputs are don't care depending on the settings).

See Table 16 for all control combinations.

Table 15. PA Bias Output Control by Inputs

Input

Bit/Pin Name

Description

Bit 6

BIAS_CTRL

Determines if the bias DACs always use the EXT_PAx_BIAS_ON data for each channel (BIAS_CTRL = 0)

or if the bias DACs can be controlled with the other inputs (BIAS_CTRL = 1).

Bit 2

TR_SOURCE

Determines whether switching between transmit and receive mode is controlled by the SPI register or the

TR input.

Bit 6

TX_EN

Global transmit enable. Logic high enables all four transmit paths (if individual Chx_TX_EN bits are also

logic high). See Figure 94.

from Several locations in memory; see

the memory map on the ADAR1000

product page.

EXT_PAx_BIAS_ON

External PA Bias on data that can be sourced from multiple locations.

from Several locations in memory; see

the memory map on the ADAR1000

product page.

EXT_PAx_BIAS_OFF

External PA Bias off data that can be sourced from multiple locations.

Input Pins

Determines transmit or receive mode of chip when TR_SOURCE = 1.

PA_ON

Determines whether to use the CHx_PA_BIAS_ON or CHx_PA_BIAS_OFF value when the ADAR1000 is

in transmit mode, BIAS_CTRL is set to 1, and in TR pin control.

Table 16. Control of PA Bias Outputs

BIAS_CTRL

(Register 0x030, Bit 6)

TR_SOURCE

(Register 0x031, Bit 2)

TX_EN

(Register 0x031, Bit 6)

(Input to Chip)

PA_ON

(Input to Chip)

PA Bias Bits Used

(x = 1, 2, 3, or 4)

EXT_PAx_BIAS_ON

EXT_PAx_BIAS_OFF

EXT_PAx_BIAS_ON

EXT_PAx_BIAS_OFF

EXT_PAx_BIAS_ON

1 X means don't care.

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