AD9961 Analog Devices, AD9961 Datasheet - Page 44

• Manufacturer Part Number: AD9961
• Description: 10-/12-Bit, Low Power, Broadband MxFE
• Manufacturer: Analog Devices

Specifications of AD9961

• Resolution (bits): 10bit
• 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: 10x2-100 MHz
• Dac Bits X #dacs-clkspeed: 10x2-170 MHz
• Pkg Type: CSP
• Primary Application: Broadband Wireless

AD9961/AD9963
Single-Ended Buffered Output Using an Op Amp
An op amp such as the
a single-ended current-to-voltage conversion, as shown in
Figure 63. The AD9961/AD9963 are configured with a pair
of series resistors, R
performance, R
determines the peak-to-peak signal swing by the formula
The maximum and minimum voltages out of the amplifier are,
respectively,
AD9961/AD9963
V
V
V
AD9961/AD9963
OUT
MAX
MIN
= V
= R
= V
MAX
FB
Figure 63. Single-Supply Single-Ended Buffer
REFIO
TXGND
Figure 62. Single-Supply Differential Buffer
REFIO
TXGND
S
× I
TXIP
TXIN
REFIO
should be set to 0 Ω. The feedback resistor, R
TXIN
− I
TXIP
FS
S
FS
, off each output. For best distortion
65
63
66
64
64
65
63
66
× R
ADA4899-1
R
FB
S
R
S
R
S
R
S
C
R
C
B
R
R
B
B
can be used to perform
ADA4899-1
–
+
ADA4841-2
ADA4841-2
–
+
+
–
R
+5V
–5V
C
FB
R
R
F
C
C
FB
FB
F
F
V
OUT
V
OUT
Rev. 0 | Page 44 of 60
FB
,
Interfacing to the ADF4602
The
other wireless communications applications. The ADF4602 Tx
baseband inputs have a nominal input common-mode voltage
requirement of 1.2 V. The AD9963 can be dc coupled to the
ADF4602 as shown in Figure 64. When configured for a 2 mA
full-scale current, the output swing of the circuit is 1 V ppd
centered at 1.2 V. The TXMCL pin is biased at 0.5 V to increase
the headroom of the DAC outputs. The TXVDD and CLK33V
supplies must be supplied with 3.3 V to support this output
compliance range from the DACs.
The optional 100 kΩ resistors connected between the AUXIO
pins and the TXIN (and TXQN) pins allow a dc offset to be
provided to null out LO feedthrough at the ADF4602 outputs.
ADF4602
ADF4602
TXBBQB
TXBBIB
Figure 64. AD9963 to ADF4602 Tx Interface Circuitry
TXBBQ
TXBBI
is an RF transceiver suitable for Femtocell and
249Ω
249Ω
249Ω
249Ω
226Ω
249Ω
226Ω
249Ω
0.1uF
100kΩ
100kΩ
TXIP
TXCML
TXIN
AUXIO2
TXQP
TXQN
AUXIO3
AD9963