TRF1121
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TRF1221
SLWS170B – APRIL 2005 – REVISED JANUARY 2008
DIGITAL INTERFACE CHARACTERISTICS
Conditions: Signal BW = 6 MHz nom, 15 dB maximum loss IF2 SAW filter. See Figure 19
V IH
V IL
I IH
I IL
C I
PARAMETER
Input high voltage
Input low voltage
Input high current
Input low current
Input capacitance
TEST CONDITIONS
MIN
2.1
0
0
0
TYP
3
MAX
5
0.8
50
–50
UNIT
V
V
μ A
μ A
pF
V OH
R OH
V OL
Output logic 1 voltage
Output logic 1 impedance
Output low voltage
0 to 100- μ A load
0 to –100- μ A load
2.4
0
18
3.6
0.4
V
k ?
V
AUXILIARY AND CONTROL
TXON
EXTLO2IP
EXTLO2IN
EXTLO2IP
EXTLO2IN
EXTLO2IP
EXTLO2IN
PARAMETER
IF amplifier enable
On-chip VCO2A selection
On-chip VCO2B selection
On-chip VCO2 selection
TEST CONDITIONS
IF output on
IF output off
Logic level applied to EXTLOIP and EXTLOIN pins to
select either on chip VCO 2A or 2B. Pullup resistor = 200 ?
and pulldown resistor = 1 k ? .
Logic level applied to EXTLOIP and EXTLOIN pins to
select the external VCO2 input
MIN
TYP MAX
High
Low
High
Low
Low
High
Low
Low
UNIT
Copyright ? 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): TRF1121 TRF1221
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