Datasheet TDA1074A Datasheet (Philips)

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INTEGRATED CIRCUITS

DATA SH EET

TDA1074A

Dual tandem electronic potentiometer circuit

Product speciﬁcation File under Integrated Circuits, IC01

December 1982

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic

TDA1074A

potentiometer circuit

GENERAL DESCRIPTION

The TDA1074A is a monolithic integrated circuit designed for use as volume and tone control circuit in stereo amplifiers. This dual tandem potentiometer IC consists of two ganged pairs of electronic potentiometers with the eight inputs connected via impedance converters, and the four outputs driving individual operational amplifiers. The setting of each electronic potentiometer pair is controlled by an individual d.c. control voltage. The potentiometers operate by current division between the arms of cross-coupled long-tailed pairs. The current division factor is determined by the level and polarity of the d.c. control voltage with respect to an externally available reference level of half the supply voltage. Since the electronic potentiometers are adjusted by a d.c. control voltage, each pair can be controlled by single linear potentiometers which can be located in any position dictated by the equipment styling. Since the input feedback impedances around the operational amplifier gain blocks are external, the TDA1074A can perform bass/treble and volume/loudness control. It also can be used as a low-level fader to control the sound distribution between the front and rear loudspeakers in car radio installations.

Features

• High impedance inputs to both ‘ends’ of each electronic potentiometer

• Ganged potentiometers track within 0,5 dB

• Electronic rejection of supply ripple

• Internally generated reference level available externally so that the control voltage can be made to swing positively

and negatively around a well-defined 0 V level

• The operational amplifiers have push-pull outputs for wide voltage swing and low current consumption

• The operational amplifier outputs are current limited to provide output short-circuit protection

• Although designed to operate from a 20 V supply (giving a maximum input and output signal level of 6 V), the

TDA1074A can work from a supply as low as 7,5 V with reduced input and output signal levels.

QUICK REFERENCE DATA

Supply voltage (pin 11) V Supply current (pin 11) I Input signal voltage (r.m.s. value) V Output signal voltage (r.m.s. value) V

i(rms) o(rms)

typ. 20 V typ. 22 mA max. 6 V

max. 6 V Total harmonic distortion THD typ. 0,05 % Output noise voltage (r.m.s. value) V

no(rms)

typ. 50 µV Control range ∆α typ. 110 dB Cross-talk attenuation (L/R) α Ripple rejection (100 Hz) α Tracking of ganged potentiometers ∆G Supply voltage range V Operating ambient temperature range T

ct 100

v P amb

typ. 80 dB typ. 46 dB typ. 0,5 dB

7,5 to 23 V

−30 to + 80 °C

PACKAGE OUTLINE

18-lead DIL; plastic (SOT102); SOT102-1; 1996 July 18.

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

TDA1074A

Fig.1 Block diagram and basic external components; Ic1 (at pin 9) and Ic2 (at pin 10) are control input currents;

Vc1 (at pin 9) and Vc2 (at pin 10) are control input voltages with respect to V Z1 = Z2 = Z3 = Z4 =22 kΩ; the input generator resistance RG = 60 Ω; the output load resistance RL = 4,7 kΩ; the coupling capacitors at the inputs and outputs are Ci = 2,2 µF and Co = 10 µF respectively.

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= VP/2 at pin 8;

ref

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic

TDA1074A

potentiometer circuit

RATINGS

Limiting values in accordance with the Absolute Maximum System (IEC 134) Supply voltage (pin 11) V

Control voltages (pins 9 and 10) ±V

; ±V

Input voltage ranges (with respect to pin 18)

at pins 3, 4, 5, 6, 13, 14, 15, 16 V Total power dissipation P Storage temperature range T Operating ambient temperature range T

i tot stg amb

THERMAL RESISTANCE

From crystal to ambient R

th cr-a

REMARK

The difference between the TDA1074 and its successor the TDA1074A is shown in Fig.2 as the different component configuration at pin 8.

max. 23 V max. 1 V

0 to VPV

max. 800 mW

−55 to + 150 °C

−30 to + 80 °C

= 80 K/W

Fig.2 Component configuration at pin 8 showing the difference between the TDA1074 and the TDA1074A.

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic

TDA1074A

potentiometer circuit

APPLICATION INFORMATION Treble and bass control circuit

= 20 V; T

response (V

Supply current (without load) I Frequency response (−1 dB)

= Vc2 = 0 V f 10 − 20 000 Hz

Voltage gain at linear frequency

response (Vc1 = Vc2 = 0 V) G

Gain variation at f = 1 kHz

at maximum bass/treble boost or cut at ±V

Bass boost at 40 Hz (ref. 1 kHz)

Vc2 = 120 mV − 17,5 − dB

= 25 °C; measured in Fig.3; RG= 60 Ω; RL> 4,7 kΩ; CL< 30 pF; f = 1 kHz; with a linear frequency

amb

= Vc2= 0 V); unless otherwise speciﬁed

PARAMETER SYMBOL MIN. TYP. MAX. UNIT

14 22 30 mA

− 0 − dB

−±1−dB

= ±Vc2 = 120 mV ∆G

(1)

Bass cut at 40 Hz (ref. 1 kHz)

= 120 mV − 17,5 − dB

−V

Treble boost at 16 kHz (ref. 1 kHz)

= 120 mV − 16 − dB

Treble cut at 16 kHz (ref. 1 kHz)

= 120 mV − 16 − dB

−V

Total harmonic distortion

o(rms)

= 300 mV

at V f = 1 kHz (measured selectively) THD − 0,002 − % f = 20 Hz to 20 kHz THD − 0,005 − % at V

o(rms)

= 5 V f = 1 kHz THD − 0,015 0,1 % f = 20 Hz to 20 kHz THD − 0,05 0,1 %

Signal level at THD = 0,7%

(input and output) V

i; o(rms)

5,5 6,2 − V

Power bandwidth at reference

level V

= 5 V (−3 dB);

o(rms)

THD = 0,1% B − 40 − kHz

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

PARAMETER SYMBOL MIN. TYP. MAX. UNIT

Output noise voltages

signal plus noise (r.m.s. value); f = 20 Hz to 20 kHz V noise (peak value); weighted to DIN 45 405; CCITT filter V

Cross-talk attenuation (stereo)

f = 1 kHz α f = 20 Hz to 20 kHz α

Control voltage cross-talk to

the outputs at f = 1 kHz;

c1(rms)

= V

Ripple rejection at f = 100 Hz;

< 200 mV α

P(rms)

= 1 mV −α

c2(rms)

no(rms)

no(m)

ct ct

100

TDA1074A

− 75 −µV

− 160 230 µV

− 86 − dB

− 80 − dB

− 20 − dB

− 46 − dB

Note

1. Gv= Vo / Vi.

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

TDA1074A

Fig.3 Application diagram for treble and bass control.

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

TDA1074A

Fig.4 Frequency response curves; voltage gain (treble and bass) as a function of frequency.

Fig.5 Control curve; voltage gain (bass)

as a function of the control voltage (Vc2); f = 40 Hz.

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Fig.6 Control curve; voltage gain

(treble) as a function of the control voltage (Vc1); f = 16 kHz.

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

TDA1074A

curve no. value of R

110kΩ 2 100 kΩ 3 220 kΩ 4 470 kΩ 51MΩ

Fig.7 Voltage gain (Gv= Vo / Vi) control curves as a function of the angle of rotation (α) of a linear

potentiometer (R); for curve numbers see table above; f = 40 Hz to 16 kHz.

Fig.8 Circuit diagram for measuring curves in Fig.7.

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

TDA1074A

Fig.9 Output signal level as a function of VP; THD = 0,7%; f = 1 kHz; Vc1= Vc2= 0 V.

Fig.10 Total harmonic distortion as a function of the output level; VP= 20 V; RL= 4,7 kΩ; Vc1= Vc2= 0 V (linear,

= 1).  f = 1 kHz; − − − − f = 20 kHz.

v tot

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

TDA1074A

Fig.11 Power bandwidth at THD = 0,1%; reference level is 5 V (r.m.s.).

Fig.12 Cross-talk as a function of frequency; linear treble/bass setting (Vc1= Vc2= 0 V);

Vi= 5 V; RG= 60 Ω; RL= 4,7 kΩ.

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic

TDA1074A

potentiometer circuit

Application recommendations

1. If one or more electronic potentiometers in an IC are not used, the following is recommended: a) Unused signal inputs of an electronic potentiometer should be connected to the associated output, e.g. pins 3

and 4 to pin 2.

b) Unused control voltage inputs should be connected directly to pin 8 (V

2. Where more than one TDA1074A IC are used in an application, pins 1 can be connected together; however, pins 8 (V

) may not be connected together directly.

ref

3. Additional circuitry for limiting the frequency response in the ultrasonic range: see Fig.13

4. Alternative circuitry for limiting the gain of the treble control circuit in the ultrasonic range: see Fig.14

ref

(1) f

= 110 kHz at linear setting.

−3 dB

Fig.13 Circuit diagram for frequency response limiting.

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

TDA1074A

For RS1= RS2= 3,3 kΩ; f For RS1= RS2= 0 Ω; f

−3 dB

≅ 1 MHz at linear setting.

−3 dB

≅ 100 kHz at linear setting.

Fig.14 Circuit diagram for limiting gain of treble control circuit.

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

PACKAGE OUTLINE

DIP18: plastic dual in-line package; 18 leads (300 mil)

seating plane

TDA1074A

SOT102-1

w M

(e )

pin 1 index

0 5 10 mm

scale

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

UNIT

max.

inches

Note

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

OUTLINE VERSION

SOT102-1

min.

max.

IEC JEDEC EIAJ

1.40

1.14

0.055

0.044

0.53

0.38

0.021

0.015

0.32

1.40

0.23

1.14

0.013

0.055

0.009

0.044

REFERENCES

(1) (1)

cD E e M

21.8

21.4

0.86

0.84

6.48

6.20

0.26

0.24

(1)

3.9

8.25

3.4

7.80

0.15

0.32

0.13

0.31

EUROPEAN

PROJECTION

0.37

0.33

9.5

8.3

max.

0.2542.54 7.62

0.854.7 0.51 3.7

0.010.10 0.30

0.0330.19 0.020 0.15

ISSUE DATE

93-10-14 95-01-23

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Philips Semiconductors Product speciﬁcation

Dual tandem electronic potentiometer circuit

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

“IC Package Databook”

our

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.

(order code 9398 652 90011).

TDA1074A

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 printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit.

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.

stg max

). If the

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.

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