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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
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

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Terminal Voltages
Test circuit: Vin = 0
Pin
1 Mute voltage (R3 = 0)
2 FM discriminator
3 Negative feedback
4 Volume control input (S4 = A)
5 AM oscillator
6 FM AFC
7 FM oscillator
8 VRef
9 FM RF tank
10 AM input
11 FM AGC
12 FM input
13 Front end ground
14 AM/FM IF output
15 Mode control switch
16 AM IF input
17 FM IF input
18 Treble control input (S5 = A)
19 LED
20 IF ground
21 AFC switch (S3 = off)
22 AGC (AM)/AFC (FM)
23 Detector output
24 AF input
25 Ripple filter
26 Supply voltage
27 AF output
28 AF ground
U2510B
Symbol
V1
V2
V3
V4
V5
V6
V7
V8
V9
V10
V11
V12
V13
V14
V15
V16
V17
V18
V19
V20
V21
V22
V23
V24
V25
V26
V27
V28
Voltage/V
VS = 3 V
VS = 6 V
AM FM TAPE AM FM TAPE
– 1.6 –
– 1.6 –
– 1.0 –
– 1.0 –
1.2 1.2 1.2 2.6 2.6 2.6
2.4 2.4 2.4 2.4 2.4 2.4
2.4 –
– 2.4 –
– 1.9 –
– 1.9 –
– 2.4 –
– 2.4 –
2.4 2.4 2.4 2.4 2.4 2.4
– 2.4 2.4 – 2.4 –
2.4 – – – 2.4 –
–0––0–
1.4 –
– 1.4 –
––––––
2.9 2.7 – 5.9 5.7 –
0 – 2.9 0 – 5.7
0––0––
– 0.7 –
– 0.7 –
2.4 2.4 2.4 2.4 2.4 2.4
000000
1.2 1.2 1.2 1.2 1.2 1.2
1.5 1.2 – 1.5 1.2 –
1.5 1.2 – 1.5 1.2 –
1.5 1.5 1.5 1.5 1.5 1.5
2.7 2.7 2.7 5.3 5.3 5.3
3.0 3.0 3.0 6.0 6.0 6.0
1.2 1.2 1.2 2.6 2.6 2.6
000000
Rev. A3, 23-Feb-01
3 (15)

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U2510B
Absolute Maximum Ratings
Parameters
Supply voltage
Power dissipation
Ambient temperature range
Symbol
VS
Ptot
Tamb
Value
13
900
–20 to +75
Unit
V
mW
°C
Electrical Characteristics
VS = 6 V, Tamb = 25°C, test circuit (figure 16), unless otherwise specified
Parameters
Test Conditions / Pins Symbol Min. Typ.
Supply voltage range
Oscillator stop voltage
Operating temperature range
VS 2.5
VS 2.2
T –20
Supply quiescent current
Vi1 = Vi2 = V4 = 0;
AM (S2 = AM)
FM (S2 = FM)
TAPE (S2 = Tape)
IS
IS
IS
4.0
6.5
2.2
Regulated voltage
Pin 8
VRef
2.4
Audio amplifier Vi3 (Pin 24), test point: Vo (Pin 27) f = 1 kHz
AF measuring range: 30 Hz to 20 kHz, S2 = Tape, S4 = A, S5 = A
Input resistance
Pin 24
Rj
100
Closed loop voltage gain
GVaf1 = 20 log (Vo/Vi3)
Vi3 = 10 mV
GVaf1
40
Output voltage
Vi3 = 100 mV, S4 = B
Vo
0.7
High–end cut-off frequency
fc (–3 dB)
S5 = B
fc 13
fc 0.8
Supply-voltage rejection ratio
SVRR = 20 log (Vhum/Vo)
Vhum = 200 mV,
fhum = 200 Hz, S4 = B
SVRR
32
Noise voltage
S4 = B, Vi3 = 0 Vn 300
AF output power
THD = 10 %, RL = 8 W
VS = 4.5 V
VS = 6.0 V
VS = 9.0 V
Po 225
Po 400 420
Po 1000
Distortion
Po = 50 mW, RL = 8 W
d
0.6
FM section, Vi2 = 60 dBmV, fi2 = 98 MHz, fm = 1 kHz, dev. = " 22.5 kHz, fiIF = 10.7 MHz,
AF measuring range: 300 Hz to 20 kHz, S2 = FM, S1 = A, S6 = B, test point: VD (Pin 23)
FM front-end voltage gain
GVFM = 20 log (ViIF / Vi2)
S1 = B, Vi2 = 40 dbmV
GVFM
30
Recovered audio voltage
Pin 23
VD af
85
Detector output resistance
Pin 23
RDo
7.5
Detector output distortion
dev. = " 75 kHz
Vi2 = 60 dBmV
Vi2 = 105 dBmV
THD
THD
0.5
0.8
* U2510B-M__T: max. 6 V
Max.
9*
+75
3
1000
Unit
V
V
°C
mA
mA
mA
V
kW
dB
mV
kHz
kHz
dB
mV
mW
mW
mW
%
dB
mV
kW
%
%
4 (15)
Rev. A3, 23-Feb-01

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U2510B
Electrical Characteristics (continued)
VS = 6 V, Tamb = 25°C, test circuit (figure 16), unless otherwise specified
Parameters
Test Conditions / Pins Symbol Min.
AM rejection ratio
m = 30%
AMRR
RF sensitivity
(S+N)/N = 26 dB
(S+N)/N = 46 dB
Vi2
Vi2
Limiting threshold (-3 dB)
Vi2
Mute voltage
Test point: Mute
Vi2 = 0
Vi2 = 60 dBmV
Vmute
Vmute
Mute depth
Referred to V0 at Vi2 = 0
S6 = A
S6 = C
MD
MD
AFC holding range
fOSC > fin, S3 = A, S6 = A
Vi2 x 10 dBmV
Vi2 = 20 dBmV
Vi2 = 80 dBmV
FHR
FHR
FHR
LED current
Oscillator voltage
eZload = 2.5 kW
Pin 7
ILED
VOSC
AM section Vi1 = 60 dBmV, fi1 = 1.6 MHz, fm = 1 kHz, m = 30%, fiIF = 455 kHz,
AF measuring range: 300 Hz to 20 kHz, (S2 = AM, S1 = B, test point: VD)
AM front end voltage gain
GVAM = 20 log (ViIF/Vi1)
Vi1 = 20 dBmV, S1 = A
GVAM
Recovered audio voltage
VD af1
Detector output resistance
Detector output distortion
Pin 23
Vi1 = 60 dBmV
Vi1 = 105 dBmV
RDo
THD
THD
RF sensitivity
AGC figure of merit referred
to VD af
(S+N)/N= 10 dB
(S+N)/N= 26 dB
(S+N)/N= 46 dB
Vi1 = 105 dBmV, voltage
drop (VD af) = –10 dB
Vi1
Vi1
Vi1
FOM
IF input resistance
Pin 16
Zi
LED current
ILED
Oscillator voltage
Pin 5
VOSC
Typ.
25
9
22
3
1.8
0.4
26
20
no AFC
" 180
" 220
5.5
180
25
70
7.5
1
3
0
16
35
100
3.1
5.5
160
Max.
Unit
dB
dBmV
dBmV
dBmV
V
V
dB
dB
kHz
kHz
mA
mV
dB
mV
kW
%
%
dBmV
dBmV
dBmV
dB
kW
mA
mV
Rev. A3, 23-Feb-01
5 (15)