AD9963 Analog Devices, AD9963 Datasheet - Page 50

• 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

AD9961/AD9963
The Tx port has an optional double data rate (DDR) clock
mode. In DDR mode, the transmit data is latched on both the
rising and falling edges of TXCLK. The polarity of the edge
identifies to which channel the input data is intended. In this
mode, the TXIQ signal is not required.
The interleaved digital data for the I and Q DACs is accepted by
the Tx bus (TXD([11:0]). The data must be presented to the
device such that it is stable throughout the setup and hold
times, t
TXCLK signal. A detailed timing diagram is shown in Figure 81.
In DDR mode, the TXCLK signal is always an input and must
be supplied along with the data. The setup and hold time
requirements for the Tx port in DDR mode are given Table 24
Table 24. Tx Port Setup and Hold Times From −40°C to
+85°C
Tx Port
Operating Mode
TXCLK_MD = 01
TXCLK_MD = 10,
TXDBLSEL = 1
TXCLK_MD = 10,
TXDBLSEL = 0
1
The input samples to the device are assembled to create a
quadrature pair of data. The two possible data pairing orders
and two possible data to TXIQ signal phase relationships create
four possible timing modes. The AD9961/AD9963 can be
configured to accept data in any of these four modes. The data
pairing order is controlled by the TX_IFIRST bit. The data to
TXIQ phase relationship is controlled by the TXIQ_HILO bit.
The two programming options produce the four timing
diagrams shown in Figure 82.
Specifications are preliminary and subject to change.
TXD[11:0]
TXCLK
1
S
and t
Figure 81. Tx Port Timing Diagram (DDR Clock Mode)
H
, around both the rising and falling edges of the
t
t
(Min)
−0.02
−1.04
−0.61
SU
DRVDD = 1.8 V
SU
t
HD
t
(Min)
+2.60
+4.24
+4.76
HD
t
SU
t
t
(Min)
+0.29
−0.28
−0.14
DRVDD = 3.3 V
HD
SU
t
(Min)
+1.99
+3.92
+4.82
HD
Unit
ns
ns
ns
Rev. 0 | Page 50 of 60
HALF-DUPLEX MODE
The AD9961/AD9963 offer a half-duplex mode enabling a
reduced width digital interface. In half-duplex mode, the
transmit and receive ports are multiplexed onto the TRXD,
TRXIQ, and TRXCLK lines. The direction of the bus can be
controlled by either the TXIQ/TXnRX pin (for the rest of this
section referred to as simply the TXnRX pin) or the serial port
configuration registers.
The operation of the transmit and receive ports in half-duplex
mode is very similar to the way they operate in full-duplex
mode. In half-duplex mode, the interface can be configured to
operate with a single clock pin, or with two clock pins. When in
Rx mode (sourcing data) the TRX port operates the same in
half-duplex mode as it does in full duplex. When in Tx mode,
the TXIQ and TXD[11:0] signals are mapped onto the TRXIQ
and TRXD[11:0] pins respectively. The TXCLK pin is mapped
to the TRXCLK pin in one-clock mode and remains on the
TXCLK pin in two-clock mode. Therefore, in one-clock mode,
the TRXCLK pin carries the RXCLK signal when set in the Rx
direction and the TXCLK signal when set in the Tx direction.
In two-clock mode, the TRX pin carries the RXCLK signal and
the TXCLK pin carries the TXCLK signal regardless of the bus
direction. By default, the clocks sourced by the device are only
present when the corresponding direction of the bus is active.
Setup and hold times for the TRx port are shown in Table 25.
Table 25. TRx Port Setup and Hold Times From −40°C to
+85°C
TRx Port
Operating Mode
TXCLK_MD = 01
TXCLK_MD = 10,
TXDBLSEL = 1
TXCLK_MD = 10,
TXDBLSEL = 0
TXD[11 :0]
TXD[11 :0]
TXD[11 :0]
TXD[11 :0]
TXCLK
Figure 82. Transmit Path Timing Modes (DDR Mode)
Q0
Q0
I0
I0
t
(Min)
+0.73
−1.66
−1.40
DRVDD = 1.8 V
SU
Q0
Q1
I1
I0
Q1
Q1
I1
I1
t
(Min)
+1.61
+5.84
+6.62
HD
Q1
Q2
I2
I1
t
(Min)
+0.44
−0.96
−1.15
DRVDD = 3.3 V
SU
Q2
Q2
I2
I2
Q2
Q3
I3
I2
t
(Min)
+1.90
+4.55
+5.11
HD
TXIFIRST = 1
TXIQPH = 1
TXIFIRST = 1
TXIQPH = 0
TXIFIRST = 0
TXIQPH = 1
TXIFIRST = 0
TXIQPH = 0
Units
ns
ns
ns