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ADRF6821 датащи(PDF) 41 Page - Analog Devices

номер детали ADRF6821
подробное описание детали  450 MHz to 2800 MHz, DPD RFIC with Integrated Fractional-N PLL and VCO
PDF  61 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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ADRF6821 датащи(HTML) 41 Page - Analog Devices

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Data Sheet
ADRF6821
Rev. A | Page 41 of 61
Bits
Bit Name
Settings
Description
Reset
Access
2
RFSW_SEL0_IN
External RF Switch Status (RFSEL0). Readback status of the external RF
channel selection pin (RF_SEL0).
0x0
R
0
Not selected (internal 50 Ω termination).
1
RF channel selected (signal connected to signal path).
1
ENB_SW_1P8_GEN
RF SW 1.8 V Reference Enable (0: off and 1: on). Active low. Note that the
input is active low; therefore, the default value of 0 enables this circuit.
0x0
R/W
0
On.
1
Off.
0
EN_SW
RF SW Enable (0: off and 1: on). Enable for the RF channel switch. This
must be enabled whenever RF Channel 1 or RF Channel 2 is used (either
closed or set to open (that is, termination).
0x0
R/W
0
Off.
1
On.
Address: 0x0031, Reset: 0x00, Name: DSA_CONTROL
DSA Enable (0:off 1:on)
DSA Atte nuatio n Co ntro l
1111: 15 dB.
1110 : 14 dB.
110 1: 13 dB.
...
10 : 2 dB.
1: 1 d B.
0: 0 dB.
DSA 1.8V Reference Enable (1:off 0:on),
Active Lo w .
0
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
[ 7 :6 ] RES ERV ED
[ 0 ] EN _D S A ( R/W )
[ 5 :2 ] AT T EN _D S A ( R/W )
[ 1 ] EN B_D S A_1 P 8 _GEN ( R/W )
Table 30. Bit Descriptions for DSA_CONTROL
Bits
Bit Name
Settings
Description
Reset
Access
[7:6]
RESERVED
Reserved.
0x0
R
[5:2]
ATTEN_DSA
DSA Attenuation Control. Controls the digital step attenuation in 1 dB steps.
0x0
R/W
0
0 dB.
1
1 dB.
10
2 dB.
…
…
1101
13 dB.
1110
14 dB.
1111
15 dB.
1
ENB_DSA_1P8_GEN
DSA 1.8 V Reference Enable (1: off and 0: on). Active low.
0x0
R/W
0
EN_DSA
DSA Enable (0: off and 1: on). This bit must be set to enable the RF digital step
attenuator.
0x0
R/W



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