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AD-DPGIOZ Datasheet(PDF) 44 Page - Analog Devices

Part # AD-DPGIOZ
Description  10-/12-Bit, Low Power, Broadband MxFE
PDF  61 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD-DPGIOZ Datasheet(HTML) 44 Page - Analog Devices

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AD9961/AD9963
Data Sheet
Rev. A | Page 44 of 60
Single-Ended Buffered Output Using an Op Amp
An op amp such as the ADA4899-1 can be used to perform
a single-ended current-to-voltage conversion, as shown in
Figure 63. The AD9961/AD9963 are configured with a pair
of series resistors, RS, off each output. For best distortion
performance, RS should be set to 0 Ω. The feedback resistor, RFB,
determines the peak-to-peak signal swing by the formula
VOUT = RFB × IFS
The maximum and minimum voltages out of the amplifier are,
respectively,
VMAX = VREFIO
VMIN = VMAX − IFS × RFB
AD9961/AD9963
TXIP
TXIN
RFB
REFIO
TXGND
CF
C
+5V
–5V
RS
RS
RB
VOUT
+
–
ADA4899-1
63
65
64
66
Figure 63. Single-Supply Single-Ended Buffer
Interfacing to the ADF4602
The ADF4602 is an RF transceiver suitable for Femtocell and
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.
226Ω
249Ω
0.1uF
249Ω
249Ω
100kΩ
226Ω
249Ω
249Ω
249Ω
100kΩ
TXIN
TXIP
TXCML
AUXIO2
TXQN
AUXIO3
TXQP
TXBBQB
TXBBQ
TXBBI
TXBBIB
AD9963
ADF4602
Figure 64. AD9963 to ADF4602 Tx Interface Circuitry
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.



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