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TRF5901 Datasheet(PDF) 5 Page - Texas Instruments

Part # TRF5901
Description  SINGLE-CHIP RF TRANSMITTER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TRF5901 Datasheet(HTML) 5 Page - Texas Instruments

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TRF5901
SINGLE-CHIP RF TRANSCEIVER
SWRS014 – DECEMBER 2002
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
DDS_VCC
18
Direct digital synthesizer supply voltage
DEM_GND
38
Quadrature demodulator ground
DEM_TANK
34, 35
I/O
Quadrature demodulator tank connection
DEM_VCC
36
Quadrature demodulator supply voltage
DIG_GND
21
Digital ground
DIG_VCC
20
Digital supply voltage
IF_GND
40
Intermediate frequency (IF) section ground
IF1_IN
42
I
Single-ended input for the 1st intermediate frequency (IF) amplifier
IF1_OUT
41
O
Single-ended output for the 1st intermediate frequency (IF) amplifier
IF2_IN
39
I
Single-ended input for the 2nd IF amplifier/limiter
LNA_GND
1, 3
Low-noise amplifier ground
LNA_IN
2
I
Low-noise amplifier input
LNA_OUT
47
O
Low-noise amplifier output, open collector
LNA_VCC
48
Low-noise amplifier supply voltage
LOCKDET
11
O
PLL lock detect output, active high. PLL locked when LOCKDET = 1.
MIX_GND
43
Mixer ground
MIX_IN
46
I
Single-ended RF mixer input
MIX_OUT
44
O
Single-ended RF mixer output
MIX_VCC
45
Mixer supply voltage
MODE
17
I
Mode select input. The functionality of the device in Mode0 or Mode1 can be programmed via the A-, B-, C-,
and D-word of the serial control interface.
GND
22
Ground
PA_GND
6
Power amplifier ground
PA_OUT
5
O
Power amplifier output, open collector
PA_VCC
4
Power amplifier supply voltage
PD_OUT1
10
O
Charge pump output – PLL in locked condition
PD_OUT2
9
O
Charge pump output – PLL in unlocked condition
PD_SET
8
Charge pump current setting terminal. An external resistor (RPD) is connected to this terminal to set the
nominal charge pump current.
PLL_GND
7
PLL ground
PLL_VCC
12
PLL supply voltage
RSSI_OUT
33
O
Receive strength signal indicator, analog output
S&H_CAP
29
I/O
Connection for sample and hold capacitor for the data slicer. This capacitor determines the integration time
constant of the integrator while in the learning mode.
STDBY
16
I
Standby control for the TRF5901, active low. While STDBY = 0, the contents of the control registers are still
valid and can be programmed via the serial control interface.
STROBE
25
I
Serial interface strobe signal
TX_DATA
19
I
Digital modulation buffered input for FSK/FM modulation of the carrier, active high
VCO_TANK1
13
I
VCO tank circuit connection. Should be left open if an external VCO is used.
VCO_TANK2
14
I
VCO tank circuit connection. May also be used to input an external VCO signal.
VREF
37
I
Reference voltage for the quadrature demodulator
XOSC1
23
O
Reference crystal oscillator connection
XOSC2
24
I
Reference crystal oscillator connection. May be used as a single-ended clock input if an external crystal
is not used.


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