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Atmel Electronic Components Datasheet



U2510B

All-Band AM/FM Receiver and Audio Amplifier



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U2510B pdf
U2510B
All-Band AM/FM Receiver and Audio Amplifier
Description
The U2510B is an integrated bipolar one-chip AM/FM
radio circuit. It contains an FM front end with
preamplifier, FM IF and demodulator, a complete AM
receiver, an AF amplifier and a mode switch for AM, FM
and tape. This circuit is designed for clock radios and
portable radio-cassette recorders.
Features
D Superior FM strong signal behavior by using RF AGC
D Soft mute and HCC for decreasing interstation noise
in FM mode
D Excellent AFC performance (level controlled, both
polarities available)
D Level indicator (LED drive) for AM and FM
D DC mode control: AM, FM and tape
D Wide supply-voltage range and low quiescent current
D High AF output power: 1 W
D Electronic volume control
D Electronic AF bandwidth control (treble and high cut)
D Output stage for headphone and speaker drive
Block Diagram
FM ant.
FM RF
tank
FM osc.
tank
987
IF BPE
6 14 16
(Replaceable)
VS
2 26 28
FM RF
BPE
AGC
AM
ant.
AM osc.
tank
AFC
12 FM
front end
FM IF
amp.
FM
discr.
11
10
5
VRef
AFC
FM control
AGC
AM IF
AM
front end
RF AGC
amp. and
detect.
IF IF
AGC
AM
Voltage stab. AM/FM
AGC
and
mode control
Level
indic.
15 21 13 20 19 1 22
27
Power
amp.
3
25
23
24
AF preamp.
Volume 4
Mute
HCC
18
AM S2
FM Tape
VS
AFC mode
LED
VS
Figure 1. Block diagram
Treble
Vol
13912
Rev. A3, 23-Feb-01
1 (15)



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U2510B pdf
U2510B
Order Information
Extended Type Number
U2510B-M
U2510B-M__T
Pin Description
Package
SDIP28
SDIP28
Mute 1
28 AF-GND
FM-discr 2
27 AFout
CF 3
Vol ctrl in 4
26 VS
25 Ripple in
AMOsc 5
24 AFin
FM-AFC 6
FMOsc 7
23 AM/FM detect
22 VAGC/AFC
VRef 8
FMtank 9
21 AFC switch
20 IF-GND
AMtank 10
19 LED drive
FM-AGC 11
FMin 12
18 VTreble in
17 FM-IFin
FE-GND 13
16 AM-IFin
AM/FM
IFout
14
15
14812
Mode ctrl
switch
Figure 2. Pinning
Pin Symbol
Function
1 Mute Mute voltage output, time constant (C23),
mute depth and threshold adjustable by load
resistance (R3)
2 FM-discr FM discriminator filter connection, ceramic
resonator or equivalent LC-circuit
3 CF Audio negative feedback input. Blocking
capacitor (C8) determines the audio amplifiers
low-end cut-off frequency
4 Vol ctrl in Input for volume control voltage
Remarks
VS < 6 V supply voltage
Pin Symbol
Function
5 AMOsc AM oscillator tank circuit input, recommended
load impedance approximately 2.5 kW
6 FM–AFC AFC diode connection, coupling capacitor
(C19) determines the AFC characteristic
(holding range and slope)
7 FMOsc FM oscillator tank circuit input, recommended
load impedance approximately 3 kW
8 VRef Regulated voltage output (2.4 V)
9 FMtank FM RF tank circuit connection, recommended
load impedance approximately 3 kW
10 AMtank AM RF tank circuit connection, recommended
load impedance approximately 20 kW
11 FM-AGC FM AGC voltage output, time constant (C20).
Loading this pin by a resistor (to GND) will
increase the FM AGC threshold, grounding
this pin will switch off the FM AGC function
12 FMin FM RF input (common-base preamplifier
transistor), recommended (RF) source
impedance approximately 100 W
13 FE-GND FM front-end ground
14 AM/FM AM/FM IF output
IFout (collector output of the IF preamplifier)
15 Mode ctrl Mode control input:
switch
Pin
| Function
open | FM
Ground
| AM
VS (R4 = 10 kW) | Tape
16 AM-IFin AM IF input, input impedance = 3.1 kW
17 FM-IFin FM IF input, input impedance = 330 W
18 VTreble in Treble control voltage input
19 LED drive Level indicator output
(open-collector output, LED drive)
20 IF-GND IF ground
21 AFC switch AFC function control input:
Pin | Function
open | AFC off
Ground
VS
| fOSC > fin
| fOSC < fin
22 VAGC/AFC AGC/AFC voltage, time constant adjust (C10),
input impedance approximately 42 kW
23 AM/FM AM/FM detector output, the load capacitor
detect
(C11) in conjunction with the detector output
resistance (7.5 kW) determines the (FM)
deemphasis as well as the (modulation)
frequency response of the AM detector
24 AFin Audio amplifier input, input resistance
approximately 100 kW, coupling capacitor
(C9) determines the low frequency response
25 Ripple in Ripple filter connection. Load capacitance
(C12) determines the frequency response of the
supply-voltage ripple rejection
26 VS Supply voltage input
27 AFout Audio amplifier output
28 AF-GND Ground of the audio power stage
2 (15)
Rev. A3, 23-Feb-01



Part Number U2510B
Description All-Band AM/FM Receiver and Audio Amplifier
Maker ATMEL Corporation - ATMEL Corporation
Total Page 15 Pages
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