TDA5051A
Home automation modem
Rev. 5 — 13 January 2011
Product data sheet
1. General description
The TDA5051A is a modem IC, specifically dedicated to ASK transmission by means of
the home power supply network, at 600 baud or 1200 baud data rate. It operates from a
single 5 V supply.
2. Features and benefits
Full digital carrier generation and shaping
Modulation/demodulation frequency set by clock adjustment, from microcontroller or
on-chip oscillator
High clock rate of 6-bit D/A (Digital to Analog) converter for rejection of aliasing
components
Fully integrated output power stage with overload protection
Automatic Gain Control (AGC) at receiver input
8-bit A/D (Analog to Digital) converter and narrow digital filtering
Digital demodulation delivering baseband data
Easy compliance with EN50065-1 with simple coupling network
Few external components for low cost applications
SO16 plastic package
3. Applications
Home appliance control (air conditioning, shutters, lighting, alarms and so on)
Energy/heating control
Amplitude Shift Keying (ASK) data transmission using the home power network
NXP Semiconductors
TDA5051A
Home automation modem
4. Quick reference data
Table 1.
Symbol
V
DD
I
DD(tot)
Quick reference data
Parameter
supply voltage
total supply current
f
osc
= 8.48 MHz
Reception mode
Transmission mode;
DATA_IN = 0; Z
L
= 30
Ω
Power-down mode
f
cr
f
osc
V
o(rms)
V
i(rms)
THD
T
amb
[1]
[2]
[3]
[1]
Conditions
Min
4.75
-
-
-
[2]
Typ
5.0
28
47
19
132.5
-
-
-
−55
-
Max
5.25
38
68
25
-
9.504
122
122
-
+100
Unit
V
mA
mA
mA
kHz
MHz
dBμV
dBμV
dB
°C
carrier frequency
oscillator frequency
output carrier signal (RMS value)
input signal (RMS value)
total harmonic distortion on CISPR16 load
with coupling network
ambient temperature
DATA_IN = LOW;
Z
L
= CISPR16
-
6.08
120
[3]
82
-
−50
The value of the total transmission mode current is the sum of I
DD(RX/TX)(tot)
+ I
DD(PAMP)
in the
Table 5 “Characteristics”.
Frequency range corresponding to the EN50065-1 band. However, the modem can operate at any lower oscillator frequency.
The minimum value can be improved by using an external amplifier; see application diagrams
Figure 19
and
Figure 20.
5. Ordering information
Table 2.
Ordering information
Package
Name
TDA5051AT
SO16
Description
plastic small outline package; 16 leads; body width 7.5 mm
Version
SOT162-1
Type number
TDA5051A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 5 — 13 January 2011
2 of 29
NXP Semiconductors
TDA5051A
Home automation modem
8. Functional description
Both transmission and reception stages are controlled either by the master clock of the
microcontroller or by the on-chip reference oscillator connected to a crystal. This ensures
the accuracy of the transmission carrier and the exact trimming of the digital filter, thus
making the performance totally independent of application disturbances such as
component spread, temperature, supply drift and so on.
The interface with the power network is made by means of an LC network (see
Figure 15).
The device includes a power output stage that feeds a 120 dBμV (RMS) signal on a
typical 30
Ω
load.
To reduce power consumption, the IC is disabled by a power-down input (pin PD): in this
mode, the on-chip oscillator remains active and the clock continues to be supplied at
pin CLK_OUT. For low-power operation in reception mode, this pin can be dynamically
controlled by the microcontroller, see
Section 8.4 “Power-down mode”.
When the circuit is connected to an external clock generator (see
Figure 6),
the clock
signal must be applied at pin OSC1 (pin 7); OSC2 (pin 8) must be left open-circuit.
Figure 7
shows the use of the on-chip clock circuit.
All logic inputs and outputs are compatible with TTL/CMOS levels, providing an easy
connection to a standard microcontroller I/O port.
The digital part of the IC is fully scan-testable. Two digital inputs, SCANTEST and TEST1,
are used for production test: these pins must be left open-circuit in functional mode
(correct levels are internally defined by pull-up or pull-down resistors).
8.1 Transmission mode
To provide strict stability with respect to environmental conditions, the carrier frequency is
generated by scanning the ROM memory under the control of the microcontroller clock or
the reference frequency provided by the on-chip oscillator. High frequency clocking rejects
the aliasing components to such an extent that they are filtered by the coupling
LC network and do not cause any significant disturbance. The data modulation is applied
through pin DATA_IN and smoothly applied by specific digital circuits to the carrier
(shaping). Harmonic components are limited in this process, thus avoiding unacceptable
disturbance of the transmission channel (according to CISPR16 and EN50065-1
recommendations). A
−55
dB Total Harmonic Distortion (THD) is reached when the typical
LC coupling network (or an equivalent filter) is used.
The DAC and the power stage are set in order to provide a maximum signal level of
122 dBμV (RMS) at the output.
The output of the power stage (TX_OUT) must
always
be connected to a decoupling
capacitor, because of a DC level of 0.5V
DD
at this pin, which is present even when the
device is not transmitting. This pin must also be
protected against overvoltage and
negative transient signals.
The DC level of TX_OUT can be used to bias a unipolar
transient suppressor, as shown in the application diagram (see
Figure 15).
Direct connection to the mains is done through an LC network for low-cost applications.
However, an HF signal transformer could be used when power-line insulation has to be
performed.
TDA5051A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 5 — 13 January 2011
5 of 29
PCB Design
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