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FM IF RECEIVER KA8513B/C
INTRODUCTION
The KA8513B is designed for FM IF Detection on the pager set. It
includes a voltage regulator, low battery detection circuitry, Mixer,
Oscillator, FSK comparator and limiting IF Amplifier.
FEATURES
• Operating voltage range: 1.0 ~ 4.0V
• Typical supply current: 1.1mA at 1.4V
• Low battery detection circuit (alarm function): 1.05V
• Voltage regulator: Vreg = 1.0V (Typ.)
• Mixer operating frequency: 10 ~ 50MHz
• High transmitting rate: 1200bps / 2400bps
• FSK Data reception
• Package type: 20-SSOP (0.65mm)
ORDERING INFORMATION
20−SSOP−225
#1
Device Package Operating Temperature
KA8513B/C 20-SSOP-225 −20°C ~ +70°C
BLOCK DIAGRAM
MI GND REGO
20 19 18 17 16 15 14 13 12 11
2’nd
MIX
X-tal
Osc
1 2 3 4 5 6 7 8 9 10
OSCI OSCO MO Vcc LI LD FSKI IFO QD RAO
REGC
1.0V Reg
AO FSKO QC BSC LPFO LPFI
Alarm
Limiting IF
Amplifier
FSK
COMP.
Quick
Charge
filter AMP
audio AMP
Quad
Detector
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KA8513B FM IF RECEIVER
PIN CONFIGURATION
OSCI
OSCO
MO
Vcc
LI
LD
FSKI
IFO
QD
RAO
1
2
3
4
KA8513B
5
6
7
8
9
10
20
19
`18
17
16
15
14
13
12
11
MI
GND
REGO
REGC
AO
FSKO
QC
BSC
LPFO
LPFI
2
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FM IF RECEIVER KA8513B/C
PIN DESCRIPTION
Pin No Symbol Description
1 OSCI Oscillator input. The oscillator is an internally-biased colpitts type.
2 OSCO Oscillator output.
3 MO Mixer output pin. Output impedance ≈ 2kΩ.
Connect a 455kHz filter between this pin and the LI.
4 V
CC
VCC pin.
5 LI IF limiter amplifier input. Input impedance ≈ 2kΩ.
6 LD Bypass capacitor connect pin for the IF limiter amplifier.
7 FSKI Differential Amp reference input on the FSK comparator.
8 IFO IF Amp output.
9 QD Quadrature detection, phase shifter pin.
10 RAO Recovered audio signal output.
11 LPFI Low pass filter amplifier input. Bias is supplied from pin 10.
12 LPFO Low pass filter amplifier output.
13 BSC Battery saving control pin.
High: Battery saving off. Low: Battery saving on
14 QC Quick charge control pin.
High: Quick charge-discharge on. Low: Quick charge-discharge off.
15 FSKO FSK signal output pin.
16 AO Alarm output. This pin becomes High when VCC drops below 1.05V.
17 REGC KA8513B has an internal PNP transistor.
But, it also can support an external PNP transistor to control the power.
18 REGO Regulated voltage output.
19 GND Ground.
20 MI Mixer input impedance ≈ 5kΩ.
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Value Unit
Max. Supply Voltage V
Power Dissipation P
Operating Temperature T
Storage Temperature T
CC (MAX)
D
OPR
STG
4 V
800 mW
−20 ~ +70 °C
−55 ~ +125 °C
3
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KA8513B FM IF RECEIVER
ELECTRICAL CHARACTERISTICS
(VCC = 1.4V ±5%, fIN
= 21.4MHz, f
(2MIX)
= ±4kHz, f
DEV
= 600Hz, Ta = 25°C, unless otherwise specified)
MOD
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
Operating current I
Alarm Detection Voltage V
Alarm Low Level Output Voltage V
Alarm High Level Leakage Current I
FSK Low Level Output Voltage V
FSK High Level Leakage Current I
Regulator Output Voltage V
Quick Charge Current I
Input for −3dB Sensitivity V
Input for −12dB SINAD Sensitivity V
Recovered Audio Output Voltage V
Mixer Conversion Voltage Gain ∆G
CCN
I
CCS
AD
O (AL)
LKG (AL)
L (FSK)
LKG (FSK)
O (REG)
C
LIM
I (SEN)
O (RAO)
V (M)
Signal to Noise Ratio S/N V
Total Harmonic Distortion THD V
No Input Signal − 1.1 1.6 mA
Battery Saving − 0 10 µA
− 1.0 1.05 1.1 V
I = 100µA − − 0.4 V
− − − 2 µA
I = 100µA − − 0.4 V
− − − 2 µA
− 0.95 1.0 1.05 V
− 50 70 − µA
Mixer Input − 2.5 7.5 µVrms
IF Input − 6.0 18.0 µVrms
V
IN (2MIX)
= 500µVrms 37 55 73 mVrms
Ceramic Filter loss = −1dB 8 12 16 dB
IN (2MIX)
IN (2MIX)
= 500µVrms 38 55 − dB
= 500µVrms − 2.0 3.5 %
Mixer 3rd Order Intercept Point 3RD − − −10 − dBm
Mixer Input Resistance R
Limiting Amplifier Input Resistance R
I (MIX)
I (LA)
AM Rejection Ratio AMR V
Data Shaping Output Duty Ratio DR V
IN (2MIX)
= 5µVrms
(AM = 30%)
IN (2MIX)
= 500µVrms 40 50 60 %
− 3.5 5 6.5 kΩ
− 1.4 2 2.6 kΩ
25 40 − dB
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FM IF RECEIVER KA8513B/C
APPLICATION CIRCUIT
Alarm out FSK out
Reg.out
VCC
51
20.945MHz
+
2.2µ
1000P
100K 100K
L LH
H
0.01µ
MI GND REGO REGC AO FSKO QC BSC LPFO LPFI
20 19 18 17 16 15 14 13 12 11
2’nd
MIX
1.0V Regulator
Alarm
FSK
COMP
Quick
Charge
AMP
Filter
AMP
Audio
X-tal
Osc
1 2 3 4 5 6 7 8 9 10
OSCI OSCO MO IFI IF
56P
33P
Limiting IF
Amplifier
CFMW455E
0.1µ
Quad
Detector
FSKI IFO QD RAO
DEC
+
10µ
C9
22P
CDBM455
Vcc
+
10µ
R2
3.3K
68K
68K
560P
3.3n
68K
5
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KA8513B FM IF RECEIVER
NOTES
6
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