UG-570 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 AD9361
A11 VDDA1P1_TX_VCO Short to B11 with 1µF bypass capacitor
1 Ω series resistance
Powers supply for Tx VCO in the chip
B8 VDD_GPO GPO pull-up voltage (1.3 V to 3.3 V) Power supply for the GPO balls
B9 VDDA1P3_TX_LO 1.3 V separate trace to common supply
point
Power supply for Tx LO Generator and LO divider
B10 VDDA1P3_TX_VCO_LDO Short to B9 Power supply for the Tx VCO LDO
B11 TX_VCO_LDO_OUT Short to A11 Output of the Tx VCO LDO needed to power the Tx VCO on
the chip
D2 VDDA1P3_RX_RF Short to D3 Power supply for the Rx LNAs and the mixer GM stages
D3 VDDA1P3_RX_TX Short to E3 Power supply for Tx Low pass filter, Tx monitor, Rx trans
impedance amplifier, Rx low pass filter, AuxDAC
E2 VDDA1P3_RX_LO Short to F2 Power supply for Rx LO generator and LO divider
E3 VDDA1P3_TX_LO_BUFFER 1.3 V separate trace to common supply
point
Power supply to the Tx LO buffer that goes to the up
converter
F2 VDDA1P3_RX_VCO_LDO 1.3 V separate trace to common supply
point
Power supply input for the Rx VCO LDO
F12 VDDD1P3_DIG 1.3 V separate trace to common supply
point
Powers the digital core
Output of the Rx VCO LDO needed to power the Rx VCO
LDO in the chip
G3 VDDA1P1_RX_VCO Short to G2 with 1µF bypass capacitor
1 Ω series resistance
Power supply for the Rx VCO on the chip
H12 VDD_INTERFACE Interface pull-up voltage (1.3 V to 2.5 V) Powers the digital interface of the chip
J3 VDDA1P3_RX_SYNTH 1.3 V separate trace to common supply
point
Powers the charge pump, sigma delta modulator and the
VCO calibration block of the Rx synthesizer
K3 VDDA1P3_TX_SYNTH 1.3 V separate trace to common supply
point
Powers the charge pump, sigma-delta modulator and the
VCO calibration block of the Tx synthesizer
K4 VDDA1P3_BB 1.3 V separate trace to common supply
Powers the Tx DACs, Rx ADCs and AuxADC
VIA directly to 1.3 V plane
Provides power to the Tx output on Channel 1
Tx2 TX BALUN DC FEED VIA directly to 1.3 V plane Provides power to the Tx output on Channel 2
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