____________________________________________________ Appendix A OEM Receivers Electrical Specifications
AsteRx2 Product Family Hardware Manual v2.10.1
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Appendix A
OEM Receivers Electrical Specifications
A.1
Antenna Connector
Type:
MMCX, right angle
DC voltage:
As provided by pin#14 of the 80-pin connector
Gain range:
15 dB to 50 dB (antenna gain minus cable losses)
Never inject a DC voltage into the antenna connector as it may damage the receiver. For instance,
when using a splitter to distribute the antenna signal to several receivers, make sure that no more than
one output of the splitter passes DC. Use DC-blocks otherwise.
A.2
80-pin Connector
Connector type: SFM-140-02-SM-D
Conventions:
Pin Type: I=Input, O=Output, P=Power line, LVTTL=3V3 Low Voltage TTL.
LVTTL means VI
L
≤ 0.8V, VI
H
≥ 2.0V, VO
L
≤ 0.4V, VO
H
≥ 2.4V.
To avoid board damage, all input pins (type “I”) must be driven low or left floating (source impedance
≥10k
) when the receiver is in sleep or power-off mode, with the exception of pins #8
(nPWR_TOGGLE), #10 (nRST_IN), #76 (RS232_RX1) and #80 (RS232_RX2). Sleep/off mode can
be detected by the fact that the voltage at pin#29 (VCC_3V3_OUT) is zero. Pin#29 can be used as an
“enable” for the drivers driving the input pins.
When pull-up resistors are needed, 10k
is recommended. Always pull up to 3.3V, even when
supplying the receiver with 5-V DC at the Vin pins (not all receiver models allow 5-V DC supply, see
next warning). It is safe to connect the pull-up resistors to pin#29 (VCC_3V3_OUT).
The supported voltage range at the Vin pins depends on the receiver model:
Receiver Model
Vin range (pins#15 and #16)
AsteRx2e_OEM
3.3V<Vin<3.38V
AsteRx2i_OEM
3.3V<Vin<3.38V
AsteRx2eL_OEM
3.0V<Vin<5.5V
AsteRx2eH_OEM
3.0V<Vin<5.5V
