ADC32RF44 Datasheet, PDF (42/134 Pages) Texas Instruments – Dual-Channel, 14-Bit, 2.6-GSPS, Analog-to-Digital Converter

ADC32RF44
SBAS809 – FEBRUARY 2017
NCO SEL[1]
0
0
1
1
Table 7. NCO Selection
NCO SEL[0]
0
1
0
1
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NCO SELECTED
NCO1
NCO2
NCO3
n/a
NCO1
NCO2
NCO3
N/A
0
NCO for DDC1 of
channel x
1
2
3
GPIO4
GPIO1
GPIO3
GPIO2
0
1
2
3
INSEL1[1:0]
NCO SEL[1:0]
0
1
GPIO4
0
GPIO1
1
GPIO3
2
GPIO2
3
NCO SEL PIN
INSEL0[1:0]
Figure 99. NCO Switching from GPIO and SPI
9.3.6 SerDes Transmitter Interface
Each 12.5-Gbps serializer, deserializer (SerDes) LVDS transmitter output requires ac-coupling between the
transmitter and receiver. Terminate the differential pair with 100-Ω resistance (that is, two 50-Ω resistors) as
close to the receiving device as possible to avoid unwanted reflections and signal degradation, as shown in
Figure 100.
DA[3:0]P,
DB[3:0]P
DA[3:0]M,
DB[3:0]M
0.1 PF
Transmission Line,
ZO
0.1 PF
Rt = ZO
Rt = ZO
VCM
Receiver
Figure 100. External Serial JESD204B Interface Connection
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