AD9963 Analog Devices, AD9963 Datasheet - Page 55

• Manufacturer Part Number: AD9963
• Description: 10-/12-Bit, Low Power, Broadband MxFE
• Manufacturer: Analog Devices

Specifications of AD9963

• Resolution (bits): 12bit
• Throughput Rate: 100MSPS
• # Chan: 2
• Supply V: Multi(+1.8Anlg, +1.8Dig),Multi(+1.8Anlg, +3.3Dig) ,Single(+1.8),Single(+3.3)
• Sample Rate: 100MSPS
• Adc Bits X #adcs-speed: 12x2-100 MHz
• Dac Bits X #dacs-clkspeed: 12x2-170 MHz
• Pkg Type: CSP
• Primary Application: Broadband Wireless

POWER SUPPLIES
The AD9961/AD9963 power distributions are shown in Figure 93.
The functional blocks labeled Rx ANLG, Rx ADCs, SPI and
digital core, clocking, and DLL operate from 1.8 V supplies. The
functional blocks labeled Tx DACs, AUX DACs and digital I/O
operate over a supply voltage range from 1.8 V to 3.3 V. The
auxiliary ADC operates from a 3.3 V supply.
The 1.8 V only blocks can be supplied directly with 1.8 V by
using the RX18V, RX18VF, DLL18V, CLK18V, and DVDD18V
supply pins. In this mode, the on-chip voltage regulators must
be disabled. To provide optimal ESD protection for the device,
the inputs of the LDO regulators should not be left floating.
When unused, the LDO regulator inputs should be tied to one
of the LDO outputs (for example, if RX33V is unused, tie
RX33V to either RX18V or RX18VF).
When the LDO regulators are used, the RX18V, RX18VF,
DLL18V, CLK18V, and DVDD18V pins should be decoupled to
ground with a 0.1 µF or larger capacitor. The LDO inputs can
operate over a range from 2.5 V to 3.3 V.
The LDO_EN pin (Pin 14) is a three-state input pin that
controls the operation of the LDOs. When LDO_EN is high, all
of the LDOs are enabled. When LDO_EN is low, all of the
LDOs are disabled. When LDO_EN is floating or approximately
DRVDD/2, only the DVDD18V LDO is enabled. All of the
LDOs except the DVDD18V LDO can be independently
disabled through serial port control as well by writing to
Register 0x61.
The three DRVDD pins are internally connected together,
therefore, these pins must be connected to the same voltage.
The voltage applied to these pins affects the timing of the device
as noted in the Digital Interfaces section.
The TXVDD and AUX33V supplies can operate over a range
from 1.8 V to 3.3 V. It should be noted that the auxiliary ADC
requires AUX33V to be 3.3 V for operation. The performance
of the Tx DACs vary with the TXVDD supply as indicated in
the Table 1 and Figure 4 to Figure 11.
AUX33V
RX18VF
RX18V
RX33V
Figure 93. AD9961/AD9963 Power Distribution Block Diagram
AD9961/AD9963
LDO
LDO
AUX ADCs
AUX DACs
Rx ANLG
Rx ADCs
CLOCKING
DIGITAL I/O
SPI AND
DIGITAL
CORE
DLL
Tx DACs
LDO
LDO
LDO
TXVDD(2)
DLL18V
CLK18V
DVDD18V
DRVDD(3)
Rev. 0 | Page 55 of 60
POWER SUPPLY CONFIGURATION EXAMPLES
There are numerous ways of configuring the power supplies
powering the AD9961/AD9963. Two power supply
configuration examples are shown in Figure 94 and Figure 95.
Figure 94 shows a 3.3 V only power supply configuration. In
this case, all of the internal circuits that require 1.8 V supplies
are powered from the on-chip regulators. The LDO_EN pin is
set high, and all of the internal LDOs are enabled. The transmit
DAC, auxiliary converters, and I/O pads run from a 3.3 V supply.
Figure 95 shows a power supply configuration where all 1.8 V
voltage rails are powered by external supplies. The LDO_EN
pin is left floating, and all of the internal LDOs except
DVDD18V are disabled. The transmit DAC, auxiliary
converters and I/O pads run from a 3.3 V supply.
POWER DISSIPATION
The AD9961/AD9963 power dissipation is highly dependent on
operating conditions. Table 30 and Figure 96 to Figure 103 show
the typical current consumption by power supply domain under
different operating conditions.
The current draw from the 1.8 V supplies are independent of
whether they are supplied by the on-chip regulators or by an
external 1.8 V supply. The quiescent current of the LDO regulators
are about 100 µA.
The current drawn from the AUX33V supply by the auxiliary ADC
is typically 350 µA. The 10-bit auxiliary DACs each typically draw
275 µA from the AUX33V supply. The 12-bit auxiliary DACs
typically draw 550 µA each from the AUX33V supply.
1.8V
AD9961/AD9963
AD9961/AD9963
Figure 95. 3.3 V and 1.8 V Supply Configuration
Figure 94. 3.3 V Only Supply Configuration
AD9961/AD9963
REG 0x61 = 0x00
3.3V
3.3V