User's Manual

TB7100 Specifications Manual System Specifications 13
© Tait Electronics Limited May 2005
1.3 System Interface
General
RSSI Output
Output Impedance
Output Level Range
Accuracy
Response Time
RF Input Range
1 k Ω
offset 600 mV, then 25 mV/dB from –120 to –50 dBm
±300 mV
≤ 10 ms
– 115 dBm to – 50 dBm
Rx Gate Output
Low Voltage Level
High Voltage Level
Low Level Sink Current
High Level Leakage Current
Activated:
Open collector, active low
Sink up to 250mA
Deactivated:
Floating
Protection
< 0.4 V
< 30 V
< 250 mA
< 100 µA
valid carrier received via RF input
no carrier received via RF input
33 V zener to ground
Tx Key Input
Low Input Voltage
High Input Voltage
Input Hysteresis
Input Resistance
Maximum External Pull-up Voltage
Internal Pull-up Voltage
≤ 2 V (TXKEY = activated)
≥ 5 V (TXKEY = de-activated)
≅ 3 V
≥ 10 kΩ
≤ 20 V
9 V (via 10 kΩ)
Tx Relay Output
Typical On Vo l t a g e
Maximum On Input Current
Maximum Off Voltage
< 0.4 V
≥ 250 mA
< 30 V
System Relay output
Internal Bias
Drive
Peak load current
Resistance
Protection
none
open collector active low Z
Sink up to 250 mA
35 Ω max
33 V zener to ground
Digital Output
High
Low
Internal Bias
Protection
≥3.1 V (no load)
<0.6 V (10mA sink)
pull up to 3.3 V via 33 kΩ
RC, diode clamps to 3.3 V and ground
Digital Input
High Threshold
Low Threshold
Internal Bias
Low Level Output Current
Protection
≥2.0 V (deactivated)
≤0.8 V (activated)
pull up to 3.3 V via 33 kΩ
<100 mA
RC, diode clamps to 3.3 V and ground