U2759B [TEMIC]

IF Signal Processing for DAB; 中频信号处理数字音频广播


型号：	U2759B
厂家：	TEMIC SEMICONDUCTORS
描述：	IF Signal Processing for DAB 中频信号处理数字音频广播射频和微波射频混频器微波混频器局域网
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U2759B

IF Signal Processing for DAB

Description

The U2759B is a bipolar integrated IF signal processing circuit. It is designed for DAB (Digital Audio Broadcasting)

applications.

Features

High linearity of the complete circuit

3-stage gain controlled wideband amplifier

Internal AGC loops

AGC time constants and thresholds adjustable

Mixer: double balanced high current Gilbert Cell

Block Diagram

9144

IF1IN

IF2OUT

IF1IN

AGCPRE

Bandgap

GND

THRPRE

VREF

LO LO

AGCT

THRIF

Figure 1.

Ordering and Package Information

Extended Type Number

U2759B-A

Package

DIP16

Remarks

U2759B-AFL

U2759B-AFLG3

SO24

Taping according ICE-286-3

TELEFUNKEN Semiconductors

1 (9)

Rev. A1, 06-Sep-96

Preliminary Information

U2759B

Pin Description

Symbol

IF1IN

Function

IF1IN

IF1 input

THRPRE AGC-threshold for pre-amplifier

AGCPRE AGC for pre-amplifier

GND

THRPRE

GND

Ground

AGCT

AGC time constant for

IF amplifier

AGCPRE

IF2OUT IF2 output

GND

Not connected

Local oscillator

AGCT

VREF

THRIF AGC-threshold for IF amplifier

11 DC

IF2OUT

VREF

DC-level

Reference voltage

Bandgap

THRIF

GND

IF1IN

Supply voltage

Ground

IF1 input

12585

Figure 2. Pinning DIP16

Symbol

IF1IN

Function

IF1IN

GND

IF1IN

THRPRE

IF1 input

THRPRE AGC-threshold for pre-amplifier

NC Not connected

AGCPRE AGC for pre-amplifier

GND

AGCT

22 NC

Ground

AGC time constant for

IF amplifier

Not connected

AGCPRE

GND

AGCT

20 VS

IF2OUT IF2 output

Not connected

Local oscillator

Not connected

18 VREF

IF2OUT

THRIF

THRIF AGC threshold for IF amplifier

VREF

GND

IF1IN

DC-level

Reference voltage

Bandgap

Supply voltage

Not connected

Ground

12584

IF1 input

Figure 3. Pinning SO24

2 (9)

TELEFUNKEN Semiconductors

Rev. A1, 06-Sep-96

Preliminary Information

U2759B

Pin Description for DIP16

IF1IN

AGCPRE

The input voltage is fed via Pins 1 and 16 to the first stage

of the 3 stage gain-controlled wide-band amplifier. The

first stage has an internal dc voltage supply with an

internal resistance of 2 k to connect the SAW filters

directly.

Pin 3 is an open-collector output. Depending on the input

level, a control voltage can be generated for the external

pre-stage by using an external voltage divider. This

prevents an overdrive of input IF1. The threshold for

activation of the open-collector output is adjusted with

Pin 2.

9229

1.2 k

3 k

9227

Figure 4.

THRPRE

The control of a pre-stage can be adjusted at Pin 2 by using

an external potentiometer switched against ground. With

increasing voltage at Pin 2, control of the (external) pre-

stage does not become active until there is a high input

level at IF1. If Pin 2 is not connected, the control only

becomes active if the input is overdriven.

Figure 6.

IF2OUT

The product of input signal IF1 and the oscillator

frequency (Pins 8 and 9) can be found at Pin 6. Here it

concerns the emitter follower output with integrated

current sink. The output voltage IF2 is twice as high as the

difference between the voltage at Pin 10 and Pin 11.

3 k

2 k

9242

9228

Figure 5.

Figure 7.

TELEFUNKEN Semiconductors

3 (9)

Rev. A1, 06-Sep-96

Preliminary Information

U2759B

AGCT

The control voltage for the wide–band amplifier is

generated by using the external capacitor at Pin 5. By

integration of the control current generated in the IC,

there is a high control voltage if there is a large input level

at IF1 and a low control voltage if there is a low input

level.

The externally generated oscillator frequency is supplied

via crosspoint capacitances at Pin 8 and /or Pin 9. If the

oscillator frequency is not symmetrically connected, each

open pin has to be blocked against ground.

5.6 k

9230

9243

Figure 10.

Figure 8.

THRIF

The control threshold for the AGC is adjusted by using an

external voltage.

The dc mean value of the output signal is adjusted by

using an external voltage at Pin 11. The voltage at Pin 11

always has to be higher than the voltage at Pin 10.

5 k

9245

9244

Figure 9.

Figure 11.

4 (9)

TELEFUNKEN Semiconductors

Rev. A1, 06-Sep-96

Preliminary Information

U2759B

VREF

Functional Description

A stabilized voltage is available at Pin 12 on to which an

external voltage divider for supplying Pin 10 and Pin 11

can be connected.

The U2759B consists of a controllable wideband ampli-

fier, a mixer and AGC-block.

The input voltage V is applied at Pin 1 and 16 and it is

if1

At Pin 13, the internally generated temperature stable

reference voltage is blocked against ground. This voltage

must not be loaded by external circuitry.

fed via a 3-stage controlled wideband amplifier to the

mixer. The oscillator voltage can be applied symmetri-

cally as well as unsymmetrically.

The mixed signal is used in order to generate the AGC-

voltage. The mixed signal therefore is fed to a comparator

which charges or discharges an external capacitor depen-

dent on the signal level. The threshold of the comparator

can be adjusted externally. The generated voltage con-

trols the wideband amplifier.

More information concerning the parameters:

Noise ratio of all ICs:

Typically 11.2 dB (SSB)

Intercept point 3rd order:

Typically 58 dB (2 V at Pin 6)

The generated control voltage can be used also for an

additional external preamplifier. This AGC protects the

IF1 input against overload.

The amplitude as well as the superimposed DC-level of

the output voltage V can be adjusted by an external

IF2

voltage. V

500 A).

is therefore available at Pin 12 (max.

REF

Upper limiting threshold

4.5 V

DC-level

(Pin 11)

(Pin 6)

IF AGC threshold

(Pin 10)

9246

1.7 V

Lower limiting threshold

Figure 12.

12586

Figure 13. Adjustment of output level

TELEFUNKEN Semiconductors

5 (9)

Rev. A1, 06-Sep-96

Preliminary Information

U2759B

Absolute Maximum Ratings

Reference point Pin 4, unless otherwise specified

Parameters

Symbol

Value

Unit

Supply voltage

Supply current

Output current

Max. power dissipation

Junction temperature

Ambient temperature range

Storage temperature range

Pin 14

Pin 6

5.0

550

+125

°C

OUT

amb

–40 to +85

–40 to +125

stg

Thermal Resistance

Parameters

Symbol

Value

Unit

K/W

Junction ambient

DIP16

SO24

thJA

Electrical Characteristics

amb

= 25°C, V = 8 V, reference point Pin 4, unless otherwise specified

Parameters

DC-supply

Supply voltage

Supply current

IF-amplifier

Test Conditions / Pins

Pin 14

Symbol

Min.

6.8

Typ.

Max.

Unit

8.0

10.0

Pin 1 to 16

Input sensitivity

Input impedance

Input capacitance

IF-AGC

2 Vpp at Pin 6

1.2

120

rms

Pin 5

IF gain control range

AGC capacitor

Preamp-AGC

Available -AGC current

IF2 output

4.7

Pin 3

Pin 6

IF2-Signal bandwidth

(–3dB)

Lower limiting threshold

Upper limiting threshold

Signal adjustm.

DC level (external)

Reference voltage

Available current

MHz

lim1

1.7

4.5

lim2

Pin 10,11,12

Pin 12

5.2

ref

I(V )

500

ref

6 (9)

TELEFUNKEN Semiconductors

Rev. A1, 06-Sep-96

Preliminary Information

U2759B

Application Circuit

V_Ref

AGC

V_S

level threshold

(500 A max)

5.5 k

2.5 k

5 k

Bandgap

4.7

10 nF

100 nF

Local

oscillator

IF1 in

U2759B

n.c.

10 nF

4.7

10 k

Local

oscillator

AGC

time

Threshold

pre-amplifier

AGC

constant

3 k

V_S

9 k

Pre-amplifier

AGC

IF 2

out

12577

Figure 14.

TELEFUNKEN Semiconductors

7 (9)

Rev. A1, 06-Sep-96

Preliminary Information

U2759B

Dimensions in mm

7.82

7.42

Package DIP16

20.0 max

4.8 max

0.5 min

6.4 max

3.3

0.39 max

1.64

1.44

0.58

0.48

9.75

8.15

2.54

17.78

technical drawings

according to DIN

specifications

13015

9.15

8.65

Package SO24

15.55.

15.30

7.5

7.3

2.35

0.25

1.27

0.4

0.25

0.10

10.50

10.20

13.97

technical drawings

according to DIN

specifications

8 (9)

TELEFUNKEN Semiconductors

Rev. A1, 06-Sep-96

Preliminary Information

U2759B

Ozone Depleting Substances Policy Statement

It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to

1. Meet all present and future national and international statutory requirements.

2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems

with respect to their impact on the health and safety of our employees and the public, as well as their impact on

the environment.

It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as

ozone depleting substances (ODSs).

The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and

forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban

on these substances.

TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of

continuous improvements to eliminate the use of ODSs listed in the following documents.

1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively

2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental

Protection Agency (EPA) in the USA

3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.

TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain

such substances.

We reserve the right to make changes to improve technical design and may do so without further notice.

Parameters can vary in different applications. All operating parameters must be validated for each customer

application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized

application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,

directly or indirectly, any claim of personal damage, injury or death associated with such unintended or

unauthorized use.

TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany

Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423

TELEFUNKEN Semiconductors

9 (9)

Rev. A1, 06-Sep-96

Preliminary Information

U2759B [TEMIC]

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