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Wireless Components
ASK Transmitter 315 MHz TDA 5101A V 0.2
Specification May 1999
Preliminary
*
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TDA 5101A
preliminary
Confidential
Productinfo
Productinfo
General Description Package The TDA5101A is a single chip ASK transmitter for the frequency band 315 MHz. The IC offers a high level of integration and needs only a few external components. The device contains a 0.5 fully integrated PLL synthesizer and a A high efficiency power amplifier to drive 0.220.05 0.08 a loop antenna. A special circuit design and an unique power amplifier design are used to save current consumption 30.1 and therefore to save battery live. AddiB Index Marking tionally features like a power down mode, a low power detect and a divided clock output are implemented.
0.15 max.
1.1 max.
H
0.1 A
M
0.09
ABC 4.9
0.42 +0.15 -0.1 0.25
M
6 max.
ABC
3 0.1
C
Features
s
fully integrated frequency synthesizer VCO without external components high efficiency power amplifier frequency range 315 MHz ASK modulation
s s s s s
low supply current (typically < 7mA) voltage supply range 2.1 - 4 V power down mode low voltage sensor low external component count
s s s s
Applications
s s
Keyless entry systems Remote control systems
s s
Alarm systems Communication systems
Ordering Information
Type TDA 5101A
Ordering Code
Package P-TSSOP-10
Semiconductor Group
Product Info
Specification, May 1999
+0.08 0.125 -0.05
0.85 0.1
1
Table of Contents
1 Table of Contents 1-1
2 Product Description 2.1 2.2 2.3 2.4 Overview Applications Features Package Outlines
2-1 2-2 2-2 2-2 2-3
3 Functional Description 3.1 3.2 3.3 3.4 Pin Configuration Pin Definition and Function Block diagram Functional Blocks
3-1 3-2 3-3 3-4 3-5
4 Applications 4.1 4.3 Circuits Bill of Materials
4-1 4-2 4-2
5 Reference 5.1 5.2 Electrical Data Test Circuit
5-1 5-2 5-4
TDA 5101A
Preliminary
Confidential
Table of Contents
Semiconductor Group
1-2
Specification, May 1999
2
Product Description
Contents of this Chapter 2.1 2.2 2.3 2.4 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
TDA 5101A
Preliminary
Confidential
Product Description
2.1 Overview
The TDA5101A is a single chip ASK transmitter for the frequency band 315 MHz. The IC offers a high level of integration and needs only a few external components. The device contains a fully integrated PLL synthesizer and a high efficiency power amplifier to drive a loop antenna. A special circuit design and an unique power amplifier design are used to save current consumption and therefore to save battery live. Additionally features like a power down mode, a low power detect and a divided clock output are implemented.
2.2 Applications
s s s s
Keyless entry systems Remote control systems Alarm systems Communication systems
2.3 Features
s s s s s s s s s s
fully integrated frequency synthesizer VCO without external components high efficiency power amplifier frequency range 315 MHz ASK modulation low supply current (typically < 7mA) voltage supply range 2.1 - 4 V power down mode low voltage sensor low external component count
Semiconductor Group
2-2
Specification, May 1999
TDA 5101A
Preliminary
Confidential
Product Description
2.4 Package Outlines
1.1 max.
0.15 max.
H
A 0.220.05 0.08
M
0.1 A ABC
0.09
0.5
0.42 +0.15 -0.1 4.9 0.25
M
6 max.
ABC
3 0.1
C
30.1 Index Marking
B
Figure 2-1
P-TSSOP-10
Semiconductor Group
2-3
+0.08 0.125 -0.05
0.85 0.1
Specification, May 1999
3
Functional Description
Contents of this Chapter 3.1 3.2 3.3 3.4 1 2 3 4 5 6 7 8 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Pin Definition and Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Functional Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 PLL Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 Crystal Oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 Power Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 Low Power Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 Power Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 PLL Enable Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 Transmit Enable Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
TDA 5101A
Preliminary
Confidential
Functional Description
3.1 Pin Configuration
PDWN
1
10
LPD
VS
2
9
PAOUT
GND
3
TDA 5101A
8
PAGND
LF
4
7
COSC
DATA
5
6
CLKOUT
Pin_config.wmf
Figure 3-1
IC Pin Configuration
Semiconductor Group
3-2
Specification, May 1999
TDA 5101A
Preliminary
Confidential
Functional Description
3.2 Pin Definition and Function
Table 3-1 Pin Configuration Pin No. Symbol Equivalent I/O-Schematic Function
1 2 3 4 5 6 7 8 9 10
PDWN VS GND LF DATA CLKOUT COSC PAGND PAOUT LPD
Power down mode Voltage supply Ground Loop filter Amplitude Shift Keying data input Clock output Crystal oscillator input Power amplifier ground Power amplifier output Low power detect output
Semiconductor Group
3-3
Specification, May 1999
Confidential
Semiconductor Group
3.3 Block diagram
Figure 3-2
Clock output VS POWER DOWN MODE LOW POWER DETECT OUTPUT
Main Block Diagram
:4
Power Supply
Low voltage Sensor
3-4
Crystall oscillator Input
XTAL
PD
:64
VCO
:2
Power AMP
PAGND
LF
POWER AMPLIFIER Output
LOOP FILTER
DATA INPUT
TDA 5101A
Preliminary
Functional Description
Block_diagram.wmf
Specification, May 1999
TDA 5101A
Preliminary
Confidential
Functional Description
3.4 Functional Blocks
1. PLL Synthesizer The Phase Locked Loop synthesizer consists of a voltage controlled oscillator (VCO), an asynchronous divider chain, a phase detector, a charge pump and a loop filter and is fully implemented on chip. The tuning circuit of the VCO consisting of spiral inductors and varactor diodes is on chip, too. Therefore no additional external components are necessary. The nominal center frequency of the VCO is 630 MHz. The oscillator signal is fed both to the synthesizer divider chain and to the power amplifier. The overall division ratio of the asyncronous divider chain is 64. The phase detector is a Typ IV PD with charge pump. The passive loop filter is realized on chip.
2. Crystal Oscillator The crystal oscillator operates at a frequency of 9.84 MHz. It achieves a turn on time of typically less than 1ms. To attend this, a NIC oscillator type is implemented in the TDA 5101A. The oscillator type has the property, that the input impedance is a negative resistance in series to an inductance. Therefore the load capacitance of the crystal CL (specified by the crystal supplier) is transformed to the capacitance Cv.
-R
I
f, CL Cv
TDA 5101A
1 Cv = ----------------------1 ------- + 2 l CL
CL: : l:
crystal load capacitance for nominal frequency angular frequency inductivity of the crystal oscillator (typically 11H)
The crystal oscillator signal is divided in the frequency by 4 and guided to the open collector output CLKOUT to drive the clock input of a micro controller.
Semiconductor Group
3-5
Specification, May 1999
TDA 5101A
Preliminary
Confidential
Functional Description
An external pull up resistor (RL) is to connect between this pin and the supply voltage. The value of RL is dependent on the clock frequency and the load capacitance CLD (PCB board plus input capacitance of the microcontroller). RL can be calculated to :
1 1 R L = ------------------------------------------------ = ------------------------------------2 x f CLKOUT x C LD 20 x 10 6 x C LD
Remark: Because to the reason of a low current consumption an a low spurious radiation the largest possible RL should be choosen.
3. Power Amplifier In ASK transmission the power amplifier can be switched on with pin 5 (DTA). In this case the same pin is used as the data input. The PAOUT pin is an open collector output and requires an external pull up coil to provide bias. The coil is part of the tuning and matching LC cuircit to get best performance with the external loop antenna. To achieve the best power amplifier efficiency the high frequency voltage swing at the PAOUT pin should be two times the supply voltage. The power amplifier has its own ground pin (PAGND) in order to reduce the amount of coupling to the other circuit blocks.
4. Low Power Detect The supply voltage is sensed by a low power detector. If the supply voltage drops below 2.15 V, the LPD pin (pin10) switches to low. The minimum sink current is 1 mA. To spare at most cases the external pull up resistor, an internal pull up current of 30A is implemented. A simple application of this feature is the switching off of the power amplifier via pin 5.
5. Power Modes The IC provides three power modes, the POWER DOWN MODE, the PLL ENABLE MODE and the TRANSMIT MODE. How to get in this modes is described in the table below.
Table 3-2
PDWN L H H
DTA L L H POWER DOWN MODE PLL ENABLE MODE TRANSMIT MODE
Semiconductor Group
3-6
Specification, May 1999
TDA 5101A
Preliminary
Confidential
Functional Description
6. Power Down Mode In the POWER DOWN MODE the current consumption is less than 100nA. To switch the IC in this mode, the input pin PDWN (pin1) has to be in the low state.
7. PLL Enable Mode The turn on time of the circuit is determined by the turn on time of the crystal oscillator and is typically less than 1 msec (dependent on the crystal itself). To save current consumption and to avoid undesired power radiation during this time, the power amplifier is turned off. The current consumption at this mode is typically 3.5 mA.
8. Transmit Enable Mode In the TRANSMIT ENABLE MODE the power amplifier is turned on too, and the current consumption of the IC is about 7 mA. To get in this state, the DTA input is to switch to a high level.
Semiconductor Group
3-7
Specification, May 1999
4
Applications
Contents of this Chapter 4.1 Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.2
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
TDA 5101A
Preliminary
Confidential
Applications
4.1 Circuits
CR2032 +VCC
ON
ANT
1 +VCC C1 Data in R1 2 3 4 5 C5
10 9 C4
L1 C2 C3
R2
+VCC
TDA5101A 8
7 6
clock output
9,84 MHz CL
C6
Application_Circuit.wmf
Figure 4-1
Application Circuit
4.2 Bill of Materials
Table 4-1 315 Mhz
Part R1 R2 C1 C22) C3 C42) C51 C63) L12)
1) 2) 3)
Value 4.7 k 1k 47 nF 18 pF 330 pF 10 pF 1 nF 15 pF 39 nH
1)
COG, 0.1 pF COG, 0.1 pF
Dependent on the data rate. Dependent on the antenna and the PCB layout. The value depends on the used crystal and its nominal load capacitance (CL)
Semiconductor Group
4-2
Specification, May 1999
5
Reference
Contents of this Chapter 5.1 Electrical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 5.1.1 Absolute Maximum Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 5.1.2 Operating Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 5.2 Test Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
TDA 5101A
Preliminary
Confidential
Reference
5.1 Electrical Data
5.1.1
Absolute Maximum Range
The AC / DC characteristic limits are not guaranteed. The maximal ratings may not be exceeded under any circumstances, not even momentary and individual, as permanent damage to the IC will result.
Table 5-1 Parameter Symbol Limit Values Min Junction Temperature Storage Temperature Thermal Resistance ESD integrity, all pins TJ Ts RthSA VESD Max Unit Remarks
-40 -40
150 125 tbd.
C C K/W kV
-1
+1
100pF, 1500
Ambient Temperature under bias: TA=-25 to +85C
5.1.2
Operating Ratings
Within the operational range the IC operates as described in the circuit description. The AC / DC characteristic limits are not guaranteed
Table 5-2 Parameter Symbol Limit Values Min Max Unit Test Conditions
Supply voltage Ambient temperature
VS TA
2.1 -25
4.0 85
V C
Semiconductor Group
5-2
Specification, May 1999
TDA 5101A
Preliminary
Confidential
Reference
5.1.3
AC/DC Characteristics
Table 5-3 Supply VoltageVS = 3V, Ambient temperatureTamb = 25 C Parameter Symbol Min Limit Values Typ Max Unit Test Conditions
Current consumption
Stand by mode PLL enable Transmit enable Power Down Modeswitch Stand by mode PLL enable Transmit enable Input bias current PDWN Low Power Detect Internal pull up current Input current low voltage VCO tuning voltage ASK Modulation ASK Transmit disable ASK Transmit enable Input bias current DTA Input bias current DTA ASK data rate CLOCK driver output Output current Crystal oscillator input Load capacitance Serioues Resistance of the crystal Input inductance of the COSC pin
IS PDWN IS PLL_EN IS TRANSM V PDWN V PDWN V PDWN IPDWN I LPD1 I LPD2 V LF VDTA VDTA IDTA IDTA fDTA ICLKOUT CCOSCmax
100 3.3 7 0 1.5 1.5 4 9 0.2 Vs Vs 30 -30 1 Vs-1.6 0 1.5 -20 20 1 Vs-0.6 0.5 Vs 30
nA mA mA V V V mA V V V kHz mA
Pins 5=0V or N.C. see Test circuit
V DTA < 0.5V V DTA > 1.4V V s = 4V V s = 2.25 ... 4V V s = 1.9 ... 2.05V PLL locked PLLEN-MODE PLLEN-MODE VDTA =Vs VKDTA = 0V
5 100 11
pF Ohm H f=9.84 MHz f=9.84 MHz
Power amplifier output, transformed to 50 Ohm (see test circuit) Output Power
PPAOUT
5
dBm
f=315 MHz
Semiconductor Group
5-3
Specification, May 1999
TDA 5101A
Preliminary
Confidential
Reference
5.2 Test Circuit
50 Ohms PAOUT
C8 VLPD C2 L2 ILPD VS C4 L1 C3 VCLKOUT
Cv
ICLKOUT
9
8
7 4
1
10
TDA5101A
2
3
IPDWN
ISPDWN ISPLLEN ISTRANSM
5
6
IDTA
VPDWN
VS
VLF
VDTA
Test_circuit.wmf
Figure 5-1
Test_Circuit
Table 5-4 Transforming schematic to 50 Ohms f=315 MHz L1 L2 C2 C3 C4 C8 220 nH 56 nH 56 pF 5.6 pF 330 pF 22 pF
Semiconductor Group
5-4
Specification, May 1999

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