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TEMIC Semiconductors
TEMIC Semiconductors

U2759B Datasheet Preview

U2759B Datasheet

IF Signal Processing

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U2759B pdf
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IF Signal Processing for DAB
U2759B
Description
The U2759B is a bipolar integrated IF signal processing circuit. It is designed for DAB (Digital Audio Broadcasting)
applications.
Features
D High linearity of the complete circuit
D 3-stage gain controlled wideband amplifier
D Internal AGC loops
D AGC time constants and thresholds adjustable
D Mixer: double balanced high current Gilbert Cell
Block Diagram
IF1IN
IF1IN
16
1
AGCPRE 3
THRPRE 2
DC
11
9144
89
LO LO
5
AGCT
Figure 1.
10
THRIF
6 IF2OUT
7
NC
Bandgap 14 VS
12 13
VREF BG
4
GND
15
GND
Ordering and Package Information
Extended Type Number
U2759B-A
U2759B-AFL
U2759B-AFLG3
Package
DIP16
SO24
SO24
Remarks
Taping according ICE-286-3
TELEFUNKEN Semiconductors
Rev. A1, 06-Sep-96
Preliminary Information
1 (9)




TEMIC Semiconductors
TEMIC Semiconductors

U2759B Datasheet Preview

U2759B Datasheet

IF Signal Processing

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U2759B pdf
U2759B
Pin Description
IF1IN 1
16 IF1IN
THRPRE 2
15 GND
AGCPRE 3
14 VS
GND 4
13 BG
AGCT 5
12 VREF
IF2OUT 6
NC 7
11 DC
10 THRIF
LO 8
12585
9 LO
Figure 2. Pinning DIP16
IF1IN 1
THRPRE 2
24 IF1IN
23 GND
NC 3
22 NC
AGCPRE 4
21 NC
GND 5
20 VS
AGCT 6
19 BG
NC 7
18 VREF
IF2OUT 8
17 DC
NC 9
16 THRIF
NC 10
15 NC
NC 11
14 NC
LO 12
13 LO
12584
Figure 3. Pinning SO24
Pin Symbol
Function
1 IF1IN IF1 input
2 THRPRE AGC-threshold for pre-amplifier
3 AGCPRE AGC for pre-amplifier
4 GND Ground
5 AGCT AGC time constant for
IF amplifier
6 IF2OUT IF2 output
7 NC Not connected
8 LO Local oscillator
9 LO Local oscillator
10 THRIF AGC-threshold for IF amplifier
11 DC DC-level
12 VREF Reference voltage
13 BG Bandgap
14 VS Supply voltage
15 GND Ground
16 IF1IN IF1 input
Pin Symbol
Function
1 IF1IN IF1 input
2 THRPRE AGC-threshold for pre-amplifier
3 NC Not connected
4 AGCPRE AGC for pre-amplifier
5 GND Ground
6 AGCT AGC time constant for
IF amplifier
7 NC Not connected
8 IF2OUT IF2 output
9 NC Not connected
10 NC Not connected
11 NC Not connected
12 LO Local oscillator
13 LO Local oscillator
14 NC Not connected
15 NC Not connected
16 THRIF AGC threshold for IF amplifier
17 DC DC-level
18 VREF Reference voltage
19 BG Bandgap
20 VS Supply voltage
21 NC Not connected
22 NC Not connected
23 GND Ground
24 IF1IN IF1 input
2 (9) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 06-Sep-96




TEMIC Semiconductors
TEMIC Semiconductors

U2759B Datasheet Preview

U2759B Datasheet

IF Signal Processing

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U2759B pdf
U2759B
Pin Description for DIP16
IF1IN
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 kW to connect the SAW filters
directly.
AGCPRE
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.
1 1.2 kW
1.2 kW
9229
16
3
3 kW 3 kW
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.
6
3 kW
2 kW
Figure 5.
2
9228
9242
Figure 7.
TELEFUNKEN Semiconductors
Rev. A1, 06-Sep-96
Preliminary Information
3 (9)




Part Number U2759B
Description IF Signal Processing
Maker TEMIC Semiconductors
Total Page 9 Pages
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