U2510B
| Model | U2510B |
| Description | All-Band AM/FM Receiver and Audio Amplifier |
| PDF file | Total 15 pages (File size: 266K) |
| Chip Manufacturer | ATMEL |
f
OSC
< f
in
AGC/AFC voltage, time constant adjust (C
10
),
input impedance approximately 42 kW
AM/FM detector output, the load capacitor
(C
11
) 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
Audio amplifier input, input resistance
approximately 100 kW, coupling capacitor
(C
9
) determines the low frequency response
Ripple filter connection. Load capacitance
(C
12
) determines the frequency response of the
supply-voltage ripple rejection
Supply voltage input
Audio amplifier output
Ground of the audio power stage
Pin Description
Mute
FM-discr
1
2
27
AFout
7
8
9
10
11
FMOsc
V
Ref
FMtank
AMtank
FM-AGC
CF
3
26
V
S
Ripple in
Vol ctrl in
4
25
AMOsc
5
24
AFin
12
FMin
FM-AFC
FMOsc
6
23
AM/FM detect
7
22
V
AGC/AFC
13
14
15
V
Ref
FMtank
8
21
AFC switch
IF-GND
FE-GND
AM/FM
IFout
Mode ctrl
switch
9
20
AMtank
10
19
LED drive
FM-AGC
FMin
11
18
V
Treble in
FM-IFin
16
17
18
19
20
21
AM-IFin
FM-IFin
V
Treble in
LED drive
IF-GND
AFC switch
12
17
FE-GND
AM/FM
IFout
13
16
AM-IFin
Mode ctrl
switch
22
23
V
AGC/AFC
AM/FM
detect
14
14812
15
Figure 2. Pinning
Pin
1
Symbol
Mute
Function
Mute voltage output, time constant (C
23
),
mute depth and threshold adjustable by load
resistance (R
3
)
FM discriminator filter connection, ceramic
resonator or equivalent LC-circuit
Audio negative feedback input. Blocking
capacitor (C
8
) determines the audio amplifiers
low-end cut-off frequency
Input for volume control voltage
24
AFin
2
3
FM-discr
CF
25
Ripple in
4
Vol ctrl in
26
27
28
V
S
AFout
AF-GND
2 (15)
Rev. A3, 23-Feb-01
