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TX4915 Datasheet Preview

TX4915 Datasheet

TX4915 VHF/UHF TRANSMITTER

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TX4915 VHF/UHF TRANSMITTER
the wireless IC company
HiMARK Technology, Inc. reserves the right to change the product described in this datasheet. All information con-
tained in this datasheet is subject to change without prior notice. HiMARK Technology, Inc. assumes no responsibility
for the use of any circuits shown in this datasheet.
Description
The TX4915 is a monolithic integrated circuit intended for use as a low-cost AM/ASK
transmitter. The chip can be used in applications in the north American and European
VHF/UHF bands. The integrated VCO, phase detector, prescaler, and reference oscillator
transistor require only the addition of an external crystal to provide a complete phase-
locked loop. In addition to the standard power-down mode, the chip also includes an auto-
matic lock-detect feature that disables the transmitter output when the PLL is out-of-lock.
Features
K Fully Integrated Frequency Synthesizer
K 2.2V to 5.5V Voltage Supply Range
K Low Current and Power Down Capability
K Integrated VCO and Reference Oscillator
K integeated 64/128 Dual Modulus Prescaler
K 100MHz to 960MHz frequency Range
K Out-of-Lock inhibit Circuit
Package and Pin Assignment
16 pin, plastic SSOP (dimensions in mm)
NOTE
1. PACKAGE BODY SIZES EXCLUDE MOLD FLASH AND
GATE BURRS
2. DIMENSION L IS MEASURED IN GAGE PLANE
3. TOLERANCE 0.10 mm UNLESS OTHERWISE SPECIFIED
4. CONTROLLING DIMENSION IS MILLIMETER. CONVERTED
INCH DIMENSIONS ARE NOT NECESSARILY EXACT.
5. FOLLOWED FORM JEDEC MO-137
θ
SYMBOLS
A
A1
A2
b
C
D
E
E1
e
L
y
θ
DIMENSIONS IN MILLIMETERS
MIN NOM MAX
1.35 1.60 1.75
0.10 −−− 0.25
−−− 1.45 −−−
0.20 0.25 0.30
0.19 −−− 0.25
4.80 −−− 5.00
5.80 −−− 6.20
3.80 −−− 4.00
−−− 0.64 −−−
0.40 −−− 1.27
−−− −−− 0.10
−−−
DIMENSIONS IN INCHES
MIN NOM MAX
0.053
0.004
−−−
0.008
0.007
0.189
0.228
0.150
−−−
0.016
−−−
0.064
−−−
0.057
0.010
−−−
−−−
−−−
−−−
0.025
−−−
−−−
−−−
0.069
0.010
−−−
0.012
0.010
0.197
0.244
0.157
−−−
0.050
0.004
OSCIN 1
OSCOUT 2
TXEN 3
VSS 4
PAOUT 5
VSS1 6
VCC1 7
MODIN 8
TX4915 HiMARK
16 SW
15 LD
14 DO
13 RES
12 RESB
11 VREFP
10 VSS2
9 VCC2
Page 1
March 2000




ETC

TX4915 Datasheet Preview

TX4915 Datasheet

TX4915 VHF/UHF TRANSMITTER

No Preview Available !

the wireless IC company
TX4915
Pin Descriptions
Number Name
Description
1
OSCIN
This pin is connected directly to the base of reference oscillator transistor. The
intended reference oscillator configuration is a modifiled Colpitts.
2 OSCOUT This pin is connected directly to the emitter of reference oscillator transistor.
3
TXEN
Enable control for all circuitry. When this pin is a logic “low” all circuiits are turn
off. When this pin is logic “high”, all circuits are operating normally.
4 VSS
Ground connection for the PAOUT amp.
5
PAOUT
Transmitter output. This pin is an open collector and require a pull-up inductor for
bias/matching and a tapped capacitor for matching.
6 VSS1
Ground connection for the PAOUT buffer amplifier.
7 VCC1 This pin is used to supply bias to the PA buffer amplifier.
8
MODIN
AM analog or ASK digital modulation can be imparted to the carrieer by an input to
this pin. An external resistor is used to bias the output amplifiers through this pin.
9
VCC2
This pin is used to supply DC bias to the VCO, crystal oscillator, prescaler, PFD, and
charge pump.
10 VSS2
Digital PLL ground connection.
11 VREFP Bias voltage reference pin for bypassing the prescaler.
12 RESB
13 RES
The RES pins are used to supply DC voltage to the VCO, as well as to tune the cen-
ter frequency of the VCO.
see pin 12
14 DO
Output of the charge pump. An RC network from this pin to ground is used to estab-
lish the PLL bandwidth.
15 LD
This pin is used to set the threshold of the lock detect circuit. A shunt capacitor
should be used to set an RC time constant with the on-chip series 1kresistor.This
signal is used to clamp (enable or disable) the MODIN circuitry. The time constant
should be approximately 15 times the reference period.
16 SW
Logic “High” input selects divide-by-64 prescaler. Logic “Low” input selects divide-
by-128 prescsaler.
Page 2
March 2000


Part Number TX4915
Description TX4915 VHF/UHF TRANSMITTER
Maker ETC
Total Page 9 Pages
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