Electrical Characteristics - Texas Instruments 2000 Series Reference Manual

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The following methods can be used to measure the actual I_VSP value:
1. Use a battery powered oscilloscope to measure the voltage drop across a 0.1 Ω resistor placed in the
DCIN+ line, and then calculate the actual current using the formula I = V/R.
2. If a battery powered oscilloscope is not available, measure the potential at both sides of the 0.1 Ω
resistor (signal probe) with the GND probe at DCIN- and determine the potential difference.
Ensure that the measured I_VSP value does not exceed the calculated value.
Symbol
I_VSL Supply current for logic and receiver part in transmit and receive mode
ViL Low level input voltage of TXCT-
ViH High level input voltage of TXCT-
VoL Low level output voltage of RXDT and RXCK
VoH High level output voltage of RXDT and RXCK
VoL_R Low level output voltage of RXSS-
VoH_R High level output voltage of RXSS- (see note below)
Low power Schottky compatible fan-in of signals TXCT- (Iin = -400 µA)
Fan-In
Input current for TXCT- signal, when the Accessory Module RI-ACC-ATI2
I_IN-TXCT-
is connected
Fan-Out Low power Schottky compatible fan-out of signals RXDT and RXCK
FanOut_Rl Low power Schottky compatible fan-out of signal RXSS- (low level only)
Low power Schottky compatible fan-out of signal RXSS- (high level only)
FanOut_Rh
(see note below)
l_J1 Cable length for connecting J1 of RFM to a Control Module using flat cable
Cable length for connecting the Carrier Phase Synchronization signal
l_CPS
between two RFMs
Number of oscillator SLAVE RFMs, which can be driven from one oscillator
n_CPS
MASTER RFM
Common Mode Noise reduction ratio for noise coupled to both antenna
Com_Mode
terminals ANT1 and ANT2
R_GND Decoupling resistor between GND and GNDP (± 5%)
Note: RXSS- has an internal pull-up resistor of 10 kΩ. The parameter VoH_R therefore depends
on application specific external components.
SCBU022 – November 2002
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Table 2-2. Electrical Characteristics
Parameter
Recommended Operating Conditions
Min Typ Max
14 18 22
0 0.4 0.8
2.4 5.0
0 0.4 0.8
4.0 5.25
0.8
5.25
1
2.0 2.5 3.0
3
1
0 0.5 2.0
0 1.0 5.0
1 5
20
64.6 68 71.4
Specifications
Unit
mA
V
V
V
V
V
V
-
mA
-
-
m
m
-
dB
Ω
17