National Instruments USRP-2900 User Manual

Table 6. Connector Descriptions
Connector Description
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-2900/2901 Getting Started Guide | © National Instruments | 15

National Instruments USRP-2900 Specifications

General

Brand	National Instruments
Model	USRP-2900
Category	Radio
Language	English