adl5811 Analog Devices, Inc., adl5811 Datasheet - Page 7

• Manufacturer Part Number: adl5811
• Description: 700 Mhz To 2800 Mhz, Balanced Mixer, Lo Buffer, If Amplifier, And Rf Balun
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Datasheet
REGISTER STRUCTURE
Figure 10 illustrates the register map of ADL5811. The ADL5811
uses only register 5. As such the Control Bits should be set to 5
in all cases. The ENBL bit, DB7 respectively, when set to 0 will
enable the part. By setting this bit to 1 the mixer will be
powered down. The CAP DAC RFB IN and Out bits are used to
tune the RF Balun. In most cases they will be tuned together
with the higher settings, 15, tuning for low frequencies and
lower settings, 0, tuning for high frequencies. There are times
where it becomes advantageous to tune the input and output of
the RF balun separately and that ability is provided for here.
DB23 DB22 DB21 DB20 DB19 DB18 DB17
RESERVED
VGS2
0
0
1
.
VGS1
0
0
1
.
VGS2 VGS1 VGS0 LPF1 LPF0
LP1
0
1
.
VGS0
0
.
1
VGS
LP0
0
1
.
VGS SETTING
0
7
LOW PASS FILTER SETTING
.
CDO2
LPF
0
3
.
0
1
.
CDO1
0
.
1
RESERVED
DB16
0
CDO0
0
1
.
CDO2 CDO1 CDO0
RF BALUN OUTPUT TUNING
DB15
RFB OUT CAP DAC
Figure10. ADL5811 Register Maps
DB14
0
7
.
REV. PrA | Page 7 of 10
DB13
RESERVED
DB12
0
The LPF bits control the Low Pass Filter settings at the IF
output. The ability to tune the low pass filter allows some
tradeoff between Gain, Noise Figure and Input IP3 with higher
settings, 7, providing higher Input IP3 at the cost of some Gain
and Noise Figure while lower settings, 0, provide higher Gain
and lower NF at the cost of lower Input IP3. The VGS bits
control the VGS settings of the mixer core and will allow
further tuning of the device.
Figure 11 illustrates the optimum settings characterized for each
frequency band.
CDI2
DB11 DB10 DB9
CDI2 CDI1 CDI0
0
.
1
RFB IN CAP DAC
CDI1
0
1
.
CDI0
0
1
.
RESERVED
RF BALUN INPUT TUNING
DB8
0
ENBL
0
1
0
7
.
ENBL
DB7 DB6 DB5 DB4 DB3 DB2
DEVICE DISABLED
DEVICE ENABLED
0
ENABLE
0
RESERVED
0
0
0
C3(1) C2(0) C1(1)
CONTROL BITS
ADL5811
DB1
DB0