Datasheet TDA1072A Datasheet (Philips)

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Page 1

INTEGRATED CIRCUITS

DATA SH EET

TDA1072A

AM receiver circuit

Product speciﬁcation File under Integrated Circuits, IC01

May 1984

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

GENERAL DESCRIPTION

The TDA1072A integrated AM receiver circuit performs the active and part of the filtering functions of an AM radio receiver. It is intended for use in mains-fed home receivers and car radios. The circuit can be used for oscillator frequencies up to 50 MHz and can handle r.f. signals up to 500 mV. R.F. radiation and sensitivity to interference are minimized by an almost symmetrical design. The voltage-controlled oscillator provides signals with extremely low distortion and high spectral purity over the whole frequency range even when tuning with variable capacitance diodes. If required, band switching diodes can easily be applied. Selectivity is obtained using a block filter before the i.f. amplifier.

Features

• Inputs protected against damage by static discharge

• Gain-controlled r.f. stage

• Double balanced mixer

• Separately buffered, voltage-controlled and temperature-compensated oscillator, designed for simple coils

• Gain-controlled i.f. stage with wide a.g.c. range

• Full-wave, balanced envelope detector

• Internal generation of a.g.c. voltage with possibility of second-order filtering

• Buffered field strength indicator driver with short-circuit protection

• A.F. preamplifier with possibilities for simple a.f. filtering

• Electronic standby switch.

QUICK REFERENCE DATA

Supply voltage range V Supply current range I R.F. input voltage for S + N/N = 6 dB at m = 30% V R.F. input voltage for 3% total harmonic

distortion (THD) at m = 80% V

A.F. output voltage with V

= 1 MHz; m = 30% and fm= 400 Hz V

A.G.C. range: change of V

= 2 mV;

for 1 dB change of V

o(af)

Field strength indicator voltage at

= 500 mV; R

= 2,7 kΩ V

L(9)

PACKAGE OUTLINE

16-lead DIL; plastic (SOT38); SOT38-1; 1996 August 09.

o(af)

IND

7,5 to 18 V

15 to 30 mA

typ. 1,5 µV

typ. 500 mV

typ. 310 mV typ. 86 dB

typ. 2,8 V

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

(1) Coil data: TOKO sample no. 7XNS-A7523DY; L1 : N1/N2 = 12/32; Qo = 65; QB = 57.

Filter data: Z

= 700 Ω at R

= 3 kΩ; ZI = 4,8 kΩ.

3-4

Fig.1 Block diagram and test circuit (connections shown in broken lines are not part of the test circuit).

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

FUNCTIONAL DESCRIPTION Gain-controlled r.f. stage and mixer

The differential amplifier in the r.f. stage employs an a.g.c. negative feedback network to provide a wide dynamic range. Very good cross-modulation behaviour is achieved by a.g.c. delays at the various signal stages. Large signals are handled with low distortion and the S/N ratio of small signals is improved. Low noise working is achieved in the differential amplifier by using transistors with low base resistance.

A double balanced mixer provides the i.f. output signal to pin 1.

Oscillator

The differential amplifier oscillator is temperature compensated and is suitable for simple coil connection. The oscillator is voltage-controlled and has little distortion or spurious radiation. It is specially suitable for electronic tuning using variable capacitance diodes. Band switching diodes can easily be applied using the stabilized voltage V buffered oscillator output (pin 10) is available for driving a synthesizer. If this is not needed, resistor R

L(10)

Gain-controlled i.f. ampliﬁer

This amplifier comprises two cascaded, variable-gain differential amplifier stages coupled by a band-pass filter. Both stages are gain-controlled by the a.g.c. negative feedback network.

. An extra

11-16

can be omitted.

Detector

The full-wave, balanced envelope detector has very low distortion over a wide dynamic range. Residual i.f. carrier is blocked from the signal path by an internal low-pass filter.

A.F. preampliﬁer

This stage preamplifies the audio frequency output signal. The amplifier output has an emitter follower with a series resistor which, together with an external capacitor, yields the required low-pass for a.f. filtering.

A.G.C. ampliﬁer

The a.g.c. amplifier provides a control voltage which is proportional to the carrier amplitude. Second-order filtering of the a.g.c. voltage achieves signals with very little distortion, even at low audio frequencies. This method of filtering also gives fast a.g.c. settling time which is advantageous for electronic search tuning. The a.g.c. settling time can be further reduced by using capacitors of smaller value in the external filter (C16 and C17). The a.g.c. voltage is fed to the r.f. and i.f. stages via suitable a.g.c. delays. The capacitor at pin 7 can be omitted for low-cost applications.

Field strength indicator output

A buffered voltage source provides a high-level field strength output signal which has good linearity for logarithmic input signals over the whole dynamic range. If the field strength information is not needed, R

can be omitted.

L(9)

Standby switch

This switch is primarily intended for AM/FM band switching. During standby mode the oscillator, mixer and a.f. preamplifier are switched off.

Short-circuit protection

All pins have short-circuit protection to ground.

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

RATINGS

Limiting values in accordance with the Absolute Maximum Rating System (IEC 134) Supply voltage V

Total power dissipation P Input voltage V

Input current I Operating ambient temperature range T Storage temperature range T Junction temperature T

THERMAL RESISTANCE

= V

13-16

tot

 max. 12 V

14-15

, −V

−V

14-16

, I15 max. 200 mA

14 amb stg j

, V

15-16

max. 20 V max. 875 mW

max. 0,6 V max. VPV

−40 to + 80 °C

−55 to + 150 °C

max. + 125 °C

From junction to ambient R

th j-a

= 80 K/W

DEVICE CHARACTERISTICS

= V

13-16

= 8,5 V; T

= 25 °C; fi = 1 MHz; fm = 400 Hz; m = 30%; fif = 460 kHz; measured in test circuit of Fig.1;

amb

unless otherwise speciﬁed

PARAMETER SYMBOL MIN. TYP. MAX. UNIT

Supplies

Supply voltage V Supply current I

= V

13-16

= I

7,5 8,5 18 V

15 23 30 mA

R.F. stage and mixer

Input voltage (d.c. value) V R.F. input impedance at V

R.F. input impedance at V

< 300 µVR

> 10 mV R

I.F. output impedance R

, V

14-16

, R

14-16

, C

14-16

, R

14-16

, C

14-16 1-16

1-16

15-16

15-16 15-16 15-16 15-16

− VP/2 − V

− 5,5 − kΩ

− 25 − pF

− 8 − kΩ

− 22 − pF

500 −−kΩ

− 6 − pF

Conversion transconductance

before start of a.g.c. I

1/Vi

− 6,5 − mA/V

Maximum i.f. output voltage, inductive

coupling to pin 1 V

1-13(p-p)

− 5 − V

D.C. value of output current (pin 1)

= 0 V I

at V

− 1,2 − mA A.G.C. range of input stage − 30 − dB R.F. signal handling capability:

input voltage for THD = 3% at m = 80% V

i(rms)

− 500 − mV

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

PARAMETER SYMBOL MIN. TYP. MAX. UNIT

Oscillator

Frequency range f

osc

Oscillator amplitude (pins 11 to 12) V External load impedance R External load impedance for no oscillation R Ripple rejection at V

= 100 Hz

(RR = 20 log [V

13-16/V11-16

Source voltage for switching diodes (6 × V

P(rms)

= 100 mV;

]) RR − 55 − dB

D.C. output current (for switching diodes) −I Change of output voltage at

∆I11= 20 mA (switch to maximum load) ∆V

Buffered oscillator output

D.C. output voltage V Output signal amplitude V Output impedance R Output current −I

I.F., a.g.c. and a.f. stages

D.C. input voltage V I.F. input impedance R

I.F. input voltage for

THD = 3% at m = 80% V Voltage gain before start of a.g.c. V A.G.C. range of i.f. stages: change of

for 1 dB change of V

3-4

= 75 mV ∆V

3-4(ref)

A.F. output voltage at V A.F. output voltage at V

3-4(if) 3-4(if)

;

o(af)

= 50 µVV = 1 mV V

A.F. output impedance (pin 6) Z

Indicator driver

Output voltage at V

= 2,7 kΩ V

L(9)

Output voltage at V

= 2,7 kΩ V

L(9)

= 0 mV;

= 500 mV;

Load resistance R

11-12

12-11(ext) 12-11(ext)

11-16

10-16 10-16(p-p)

10(peak)

, V

3-16

4-16 3-4 3-4

3-4 3-4/V6-16

3-4 o(af) o(af)

−3,5 − kΩ

9-16

L(9)

0,6 − 60 MHz

− 130 150 mV

0,5 − 200 kΩ

−−60 Ω

− 4,2 − V 0 − 20 mA

− 0,5 − V

− 0,7 − V

− 320 − mV

− 170 −Ω

−−3mA

− 2,0 − V

2,4 3 3,9 kΩ

− 7 − pF

− 90 − mV

− 68 − dB

− 55 − dB

− 130 − mV

− 310 − mV

− 20 150 mV

2,5 2,8 3,1 V 1,5 −−kΩ

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

PARAMETER SYMBOL MIN. TYP. MAX. UNIT

Standby switch

Switching threshold at V

= −40 to + 80 °C

amb

on-voltage V off-voltage V on-current at V off-current at V

2-16 2-16

OPERATING CHARACTERISTICS

= 8,5 V; fi= 1 MHz; m = 30%; fm= 400 Hz; T

R.F. sensitivity

R.F. input required for S + N/N = 6 dB V R.F. input required for S + N/N = 26 dB V R.F. input required for S + N/N = 46 dB V R.F. input at start of a.g.c. V

R.F. large signal handling

R.F. input at THD = 3%; m = 80% V R.F. input at THD = 3%; m = 30% V R.F. input at THD = 10%; m = 30% V

A.G.C. range

o(af)

; V

i i(ref) i i(ref)

for 1 dB change

= 500 mV ∆V

for 6 dB change

= 500 mV ∆V

Change of V

of V

Change of V

of V

Output signal

A.F. output voltage at

= 4 µV; m = 80% V

A.F. output voltage at V THD at V THD at V

= 1 mV; m = 80% d

= 500 mV; m = 30% d

Signal-to-noise ratio at V Ripple rejection at V

= 100 mV; fP= 100 Hz

P(rms)

(RR = 20 log [V

P/Vo(af)

= 7,5 to 18 V;

0 − 2,0 V

3,5 − 20 V

−−200 µA

= 0 V −I

2-16 2-16

= 20 V I2−−10 µA

= 25 °C; measured in Fig.1; unless otherwise speciﬁed

amb

PARAMETER SYMBOL MIN. TYP. MAX. UNIT

i i i i

i i i

o(af)

= 1 mV V

= 100 mV (S + N)/N − 58 − dB

= 2 mV;

o(af) tot tot

− 1,5 −µV

− 15 −µV

− 150 −µV

− 30 −µV

− 500 − mV

− 700 − mV

− 900 − mV

− 86 − dB

− 91 − dB

− 130 − mV

240 310 390 mV

− 0,5 − %

− 1 − %

]) RR − 38 − dB

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

PARAMETER SYMBOL MIN. TYP. MAX. UNIT

Unwanted signals

Suppression of i.f. whistles at

= 15 µV; m = 0% related to

a.f. signal of m = 30%

≈ 2 × f

at f at f

i i

≈ 3 × f

if if

I.F. suppression at r.f. input

for symmetrical input α for asymmetrical input α

Residual oscillator signal at mixer output

at f

osc

at 2 × f

osc

2if

3if

1(osc)

1(2osc)

− 37 − dB

− 44 − dB

− 40 − dB

− 1 −µA

− 1,1 −µA

APPLICATION INFORMATION

(1) Capacitor values depend on crystal type. (2) Coil data: 9 windings of 0,1 mm dia laminated Cu wire on TOKO coil set 7K 199CN; Qo= 80.

Fig.2 Oscillator circuit using quartz crystal; centre frequency = 27 MHz.

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

Fig.3 A.F. output as a function of r.f. input in the

circuit of Fig.1; fi = 1 MHz; fm= 400 Hz; m = 30%.

Fig.4 Total harmonic distortion and (S + N)/N

as functions of r.f. input in the circuit of Fig.1; m = 30% for (S + N)/N curve and m = 80% for THD curve.

Fig.5 Total harmonic distortion as a function of modulation frequency at Vi = 5 mV; m = 80%;

measured in the circuit of Fig.1 with C

May 1984 9

7-16(ext)

= 0 µF and 2,2 µF.

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

Fig.6 Indicator driver voltage as a function

of r.f. input in the circuit of Fig.1.

Fig.8 Car radio application with inductive tuning.

Fig.7 Typical frequency response curves from

Fig.1 showing the effect of filtering as follows:

 with i.f. filter;

− - − - − - with a.f. filter;

− − − − − with i.f. and a.f. filters.

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

Fig.9 A.F. output as a function of r.f. input using the circuit of Fig.8 with that of Fig.1.

Fig.10 Suppression of cross-modulation as a function of input signal, measured in the circuit of Fig.8 with the input

circuit as shown in Fig.11. Curve is for Wanted V aerial input, V' Wanted signal (V' Unwanted signal (V'

aew

, V'

are signals at the unloaded output of the aerial.

aeu

, V

aew

): fi = 1 MHz; fm = 400 Hz; m = 30%.

rfw

, V

aeu

): fi = 900 kHz; fm = 400 Hz; m = 30%.

rfu

/Unwanted V

o(af)

= 20 dB; V

o(af)

, V

are signals at the

rfw

rfu

Effective selectivity of input tuned circuit = 21 dB.

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

Fig.11 Input circuit to show cross-modulation suppression (see Fig.10).

Fig.12 Oscillator amplitude as a function of pin 11, 12 impedance in the circuit of Fig.8.

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

Fig.13 Total harmonic distortion and (S + N)/N as functions of r.f. input using the circuit of Fig.8 with that of Fig.1.

Fig.14 Forward transfer impedance as a function of intermediate frequency for filters 1 to 4 shown

in Fig.15; centre frequency = 455 kHz.

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

Fig.15 I.F. filter variants applied to the circuit of Fig.1. For filter data, refer to Table 1.

May 1984 14

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Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

= 455 kHz).

13 31

(N1) (N2)

15 31

= maximum (optimum selectivity curve at centre frequency f

661333

12 32

L1 L1 L1 L2 L1

65 (typ.) 50 75 60 75

PACKAGE OUTLINE

DIP16: plastic dual in-line package; 16 leads (300 mil); long body

seating plane

pin 1 index

w M

SOT38-1

(e )

0 5 10 mm

scale

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

UNIT

inches

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

max.

4.7 0.51 3.7

OUTLINE VERSION

SOT38-1

min.

1 2

max.

0.15

IEC JEDEC EIAJ

050G09 MO-001AE

1.40

1.14

0.055

0.045

0.53

0.38

0.021

0.015

cEe M

0.32

0.23

0.013

0.009

REFERENCES

(1) (1)

21.8

21.4

0.86

0.84

May 1984 19

6.48

6.20

0.26

0.24

(1)

0.30

0.15

0.13

3.9

3.4

8.25

7.80

0.32

0.31

EUROPEAN

PROJECTION

9.5

8.3

0.37

0.33

0.2542.54 7.62

0.010.100.0200.19

ISSUE DATE

92-10-02 95-01-19

max.

2.2

0.087

Page 20

Philips Semiconductors Product speciﬁcation

AM receiver circuit TDA1072A

SOLDERING Introduction

There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used.

This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our

“IC Package Databook”

Soldering by dipping or by wave

The maximum permissible temperature of the solder is 260 °C; solder at this temperature must not be in contact with the joint for more than 5 seconds. The total contact time of successive solder waves must not exceed 5 seconds.

The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (T be necessary immediately after soldering to keep the temperature within the permissible limit.

(order code 9398 652 90011).

). If the printed-circuit board has been pre-heated, forced cooling may

stg max

Repairing soldered joints

Apply a low voltage soldering iron (less than 24 V) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 °C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 °C, contact may be up to 5 seconds.

DEFINITIONS

Data sheet status

Objective speciﬁcation This data sheet contains target or goal speciﬁcations for product development. Preliminary speciﬁcation This data sheet contains preliminary data; supplementary data may be published later. Product speciﬁcation This data sheet contains ﬁnal product speciﬁcations.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the speciﬁcation is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the speciﬁcation.

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.

May 1984 20