Figure 4. USRP-2900 Module Back Panel Connectors
+15 dBm MAX
PPS
5V MAX
USB
PWR
IN
6V
1 A MAX
REF IN
Connector Use
REF IN
Input terminal for an external reference signal for the local oscillator (LO) on the
device. REF IN is a female SMA connector with an impedance of 50 Ω, and it is a single-
ended reference input. REF IN accepts a 10 MHz signal with a minimum input power of
0 dBm (0.632 V
pk-pk
) and a maximum input power of 15 dBm (3.56 V
pk-pk
) for a square
wave or sine wave.
USB
Input that accepts a standard USB cable. A suitable USB cable is included in the
hardware kit.
PPS IN
Input terminal for pulse per second (PPS) timing reference. PPS IN is a female SMA
connector with an impedance of 50 Ω, and it is a single-ended input channel. PPS IN
accepts 0 V to 3.3 V TTL and 0 V to 5 V TTL signals.
PWR
Input that accepts a 6 V, 3 A external DC power connector.
USRP-2901 Connectors and LEDs
Figure 5. USRP-2901 Front Panel
NI USRP-2901
70 MHz–6 GHz
ESD
SENSITIVE
RF 0
TX1 RX1
RX2
RF 1
TX1 RX1
RX2
Designed by Ettus Research
TX OUTPUT MAX +20 dBm, RX INPUT MAX –15 dBm, ALL RF PORTS 50
Ω
Connector
Use
RF 0 TX1 RX1 Input and output terminal for the RF signal. TX1 RX1 is an SMA (f) connector with an
impedance of 50 Ω and is a single-ended input or output channel.
RX2
Input terminal for the RF signal. RX2 is an SMA (f) connector with an impedance of
50 Ω and is a single-ended input channel.
RF 1 RX2
Input terminal for the RF signal. RX2 is an SMA (f) connector with an impedance of
50 Ω and is a single-ended input channel.
© National Instruments
15
USRP-2900/2901 Getting Started
