Samsung DS S1T8515A01 Fm if receiver for flex pager Datasheet

FM IF RECEIVER FOR FLEX PAGER
S1T8515A
INTRODUCTION
24−SSOP−BD209
The S1T8515A is a designed for FM detection on the FLEX pager set.
It consists of an Oscillator, Mixer, Limiting IF Amp. Quadrature
Detector, Regulator, RSSI (Received Signal Strength Indicator), Bit
Rate Filter, and a 2-level / 4-level FSK comparator.
It has a 24-SSOP (0.65mm)Surface Mount Package.
FEATURES
•
Internal A/D converter for 4 level FSK (2-bit ADC)
•
High transmission rate: 6400bps (Max.)
•
Operating voltage range: VCC1 = 1.1 ~ 4.0V
•
Typical supply current: 1.5mA at 1.4V
•
Low battery detection circuit (alarm function): 1.05V
•
Mixer operating frequency: 10 ~ 50MHz
•
Package type: 24-SSOP (0.65mm)
ORDERING INFORMATION
Device
Package
Operating Temperature
S1T8515A01-U0B0
24−SSOP−BD209
−20°C ~ +70°C
1
S1T8515A
FM IF RECEIVER FOR FLEX PAGER
BLOCK DIAGRAM
MI
GND
24
23
2nd
MIX
REGO REGC
22
21
1.0V Regulator
1
FSKO1 FSKO2
20
Alarm
19
18
2
OSCO
BSC
QC1
17
16
FSK
Comparator
Limiting IF
Amplifier
X-tal
Osc.
OSCI
AO
15
14
RSSI
13
Quick
Charge
Quad
Detector
Bit-rate Filter
3
4
5
6
7
8
9
10
11
12
MO
Vcc
LI
LD
FSKR1
QD
C1
C2
C3
FIL VAR
PIN CONFIGURATION
OSCI
1
24 MI
OSCO
2
23 GND
MO
3
22 REGO
Vcc
4
21 REGC
LI
5
20 AO
LD
6
FSKR1
7
18 FSKO2
QD
8
17 BSC
C1
9
16 QC1
C2 10
15 QC2
C3 11
14 FSKR2
FIL VAR 12
2
QC2 FSKR2
S1T8515A
19 FSKO1
13 RSSI
FM IF RECEIVER FOR FLEX PAGER
S1T8515A
PIN DESCRIPTION
Pin No
Symbol
Description
1
OSCI
Oscillator input (Base). The oscillator is an internally biased colpitts type.
2
OSCO
Oscillator output (Emitter).
3
MO
Mixer output (Output impedance ≈ 1.5kΩ) Connect a 455kHz filter between this pin
and the LI.
4
VCC
Power supply voltage.
5
LI
IF limiter amplifier input (Input impedance ≈ 1.5kΩ).
6
LD
Bypass capacitor connect pin for the IF limiter amp.
7
FSKR1
Differential Amp Reference input on the FSK comparator.
8
QD
Quadrature detection, phase shiftier input.
9
10
11
C1
C2
C3
Capacitors for bit-rate filter.
12
FIL VAR
Bit-rate filter selection.
High: Internal cut-off frequency will be set to Low.
Low: Internal cut- off frequency will be set to High.
13
RSSI
RSSI output.
The power of received RF signal can be detected by monitoring the limiter amplifier.
14
FSKR2
Differential Amp Reference input on the FSK comparator for 4-Level FSK Detection.
15, 16
QC2, QC1
Quick charge control 2 & 1.
High: Quick charge-discharge on. Low: Quick charge-discharge off.
17
BSC
Battery saving control.
High: Battery saving off-normal mode operation.
Low: Battery saving on-battery save mode operation.
18
FSKO2
The output signal from the Bit-rate filter is compared with FSK Reference signal, and
the final output signal will be output to the LSB after 4-Level FSK detection.
19
FSKO1
The final output signal will be output to the MSB after 4-Level FSK detection.
20
AO
Alarm output.
This pin becomes high, when VCC drops below 1.05V.
21
REGC
S1T8515A has an internal PNP transistor.
But, it also can support an external PNP transistor to control the power.
22
REGO
Regulated voltage output.
23
GND
Ground.
24
MI
Mixer input (Input impedance ≈ 1.5kΩ).
3
S1T8515A
FM IF RECEIVER FOR FLEX PAGER
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Value
Unit
4
V
760
mW
Supply Voltage
VCC (MAX)
Power Dissipation
PD
Operating Temperature
TOPR
−20 — +70
°C
Storage Temperature
TSTG
−55 — +125
°C
ELECTRICAL CHARACTERISTICS
(VCC = 1.4V ±5%, fIN (2MIX) = 21.4MHz, fDEV = ±4.8kHz, fMOD = 800Hz, Ta = 25°C, FIL_VAR = “H”, unless
otherwise specified)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
ICCN
No Input Signal
−
1.5
1.75
mA
ICCS
Battery Saving
−
0
10
µA
Alarm detection voltage
VAD
−
1.0
1.05
1.1
V
Alarm low level output voltage
VO (AL)
−
−
0.4
V
−
−
2
µA
−
−
0.4
V
Operating current
I = 100µA
−
Alarm high level leakage current ILKG (AL)
FSK low level output voltage
VL (FSK)
FSK high level leakage current
ILKG (FSK)
−
−
−
2
µA
Regulator output voltage
VOREG
−
0.95
1.0
1.05
V
Quick charge current
IC
−
50
70
−
µA
Input for −3dB sensitivity
VLIM
Mixer Input
−
2.5
7.5
µVrms
Recovered audio output voltage
VO (RAO)
VIN (2MIX) = 500µVrms
36
54
78
mVrms
Mixer conversion gain
∆GV (M)
Ceramic Filter loss = −1dB
8
12
16
dB
Signal to noise ratio
S/N
VIN (MIX1N) = 500µVrms
38
55
−
dB
Total Harmonic Distortion
THD
VIN (MIX1N) = 500µVrms
−
2.0
3.5
%
Mixer 3rd order intercept point
3RD
−
−
−10
−
dBm
Mixer input resistance
RI (MIX)
−
3.5
5
6.5
kΩ
Limiting amp input resistance
RI (LA)
−
0.9
1.5
2.1
kΩ
AM rejection ratio
AMR
VIN (2MIX) = 500µVrms
(AM = 300%)
25
40
−
dB
Data shaping output duty
DR
VIN (2MIX) = 500µVrms
40
50
60
%
RSSI output voltage
VRSSI
VIN (2MIX) = 1mVrms
0.49
0.7
0.91
V
RSSI output resistance
RRSSI
90
100
110
kΩ
4
I = 100µA
−
FM IF RECEIVER FOR FLEX PAGER
S1T8515A
TEST CIRCUIT
RF Input
Alarm out FSKO1
Reg. out
2.2µ +
51
100K
100K
FSKO2 Vcc
24
GND
REGO REGC
22
2nd
MIX
21
1.0V Regulator
1
FSKO1
20
FSKO2
19
18
2
OSCO
3
MO
4
Vcc
5
LI
20.945MHz
BSC
17
QC1
16
6
7
LD FSKR1
0.1µ
CFMW455E
QC2
FSKR2
15
14
RSSI
13
Bit-rate Filter
8
QD
9
C1
+
10µ
0.1µ
Quick
Charge
Quad
Detector
56p
39p
RSSI
10µ
L
FSK
Comparator
Alarm
Limiting IF
Amplifier
X-tal
Osc.
OSCI
AO
FSKR2
+
L H
23
QC2
100K
1000p
MI
QC1
10
C2
1000p
CDBM
455
11
C3
1200p
12
FIL VAR
1500p
H
L
3.3K
+
10u
5
S1T8515A
FM IF RECEIVER FOR FLEX PAGER
NOTES
6
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