Power Distributions For Different Power Supply Domains - Analog Devices AD9361 Reference Manual

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POWER DISTRIBUTIONS FOR DIFFERENT POWER SUPPLY DOMAINS

The AD9361 has 17 power supply balls. These balls power up different circuits on the part. Table 55 shows the ball number, the ball name,
the recommended routing technique for that ball from the main 1.3 V analog supply plane and a brief description of the block it powers
up in the chip. In some cases, one finger is used to power up two to three 1.3 V power supply balls while in some cases there are some
power supply balls that have a finger just for themselves. Table 55 shows which power supply balls have their own fingers and which balls
are tied together and share one finger. Fingers provide isolation for the concerned 1.3 V power supply balls. Figure 91 shows this
structure.
Table 55. Power Supply Balls on the
Ball Ball Name
A11 VDDA1P1_TX_VCO
B8 VDD_GPO
B9 VDDA1P3_TX_LO
B10 VDDA1P3_TX_VCO_LDO
B11 TX_VCO_LDO_OUT
D2 VDDA1P3_RX_RF
D3 VDDA1P3_RX_TX
E2 VDDA1P3_RX_LO
E3 VDDA1P3_TX_LO_BUFFER
F2 VDDA1P3_RX_VCO_LDO
F12 VDDD1P3_DIG
G2 RX_VCO_LDO_OUT
G3 VDDA1P1_RX_VCO
H12 VDD_INTERFACE
J3 VDDA1P3_RX_SYNTH
K3 VDDA1P3_TX_SYNTH
K4 VDDA1P3_BB
Tx1 TX BALUN DC FEED
Tx2 TX BALUN DC FEED
AD9361
Recommended Routing
Short to B11 with 1µF bypass capacitor
1 Ω series resistance
GPO pull-up voltage (1.3 V to 3.3 V)
1.3 V separate trace to common supply
point
Short to B9
Short to A11
Short to D3
Short to E3
Short to F2
1.3 V separate trace to common supply
point
1.3 V separate trace to common supply
point
1.3 V separate trace to common supply
point
Short to G3
Short to G2 with 1µF bypass capacitor
1 Ω series resistance
Interface pull-up voltage (1.3 V to 2.5 V)
1.3 V separate trace to common supply
point
1.3 V separate trace to common supply
point
1.3 V separate trace to common supply
point
VIA directly to 1.3 V plane
VIA directly to 1.3 V plane
Rev. A
Description
Powers supply for Tx VCO in the chip
Power supply for the GPO balls
Power supply for Tx LO Generator and LO divider
Power supply for the Tx VCO LDO
Output of the Tx VCO LDO needed to power the Tx VCO on
the chip
Power supply for the Rx LNAs and the mixer GM stages
Power supply for Tx Low pass filter, Tx monitor, Rx trans
impedance amplifier, Rx low pass filter, AuxDAC
Power supply for Rx LO generator and LO divider
Power supply to the Tx LO buffer that goes to the up
converter
Power supply input for the Rx VCO LDO
Powers the digital core
Output of the Rx VCO LDO needed to power the Rx VCO
LDO in the chip
Power supply for the Rx VCO on the chip
Powers the digital interface of the chip
Powers the charge pump, sigma delta modulator and the
VCO calibration block of the Rx synthesizer
Powers the charge pump, sigma-delta modulator and the
VCO calibration block of the Tx synthesizer
Powers the Tx DACs, Rx ADCs and AuxADC
Provides power to the Tx output on Channel 1
Provides power to the Tx output on Channel 2
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AD9361 Reference Manual