U2510B Datasheet, PDF (2/15 Pages) ATMEL Corporation – All-Band AM/FM Receiver and Audio Amplifier

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 V_S
25 ^{Ripple in}
AMOsc ₅
24 AFin
FM-AFC 6
FMOsc ₇
23 ^{AM/FM detect}
22 VAGC/AFC
V_{Ref 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
V_S < 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
V_Ref
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
V_S (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 V_{Treble 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
V_S
| f_OSC > f_in
| f_OSC < f_in
22 V_AGC/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
V_S
Supply voltage input
27 AFout Audio amplifier output
28 AF-GND Ground of the audio power stage
2 (15)
Rev. A3, 23-Feb-01