Datasheet S1T8528X01-Q0R0 Datasheet (Samsung)

ENHANCED-1 CHIP CT0 RF IC S1T8528

INTRODUCTION

S1T8528 is a 1 CHIP RF IC which can be used in high performance
CTO CLP systems at max. 60MHz. S1T8528 is designed to include a
receiver, PLL and COMPANDER to minimize PCB space
requirements. Improved RX characteristics such as inter-modulation,
spurious response and adjacent channel interface have been
included to satisfy the universal standards.

The 1 CHIP RF IC has considerably reduced the cost by including a
build-in 1’st mixer, low battery detector, fMCU, RSSI, RF regulator
and speaker amp. Also, it fulfills carrier detector threshold control,
speaker volume control, operating mode selection and MUTE function
using S/W, thus making external application easier.

48−QFP−1010E

FEATURES

• Operating voltage range: 2.0V ~ 5.5V

• Typical supply current: 8.9mA at 3.6V

• Built-in low battery detection function ( selectable 3.45V, 3.3V, 3.0V, 2.2V, 2.1V )

• Built-in speaker volume control and speaker amplifier

• Built-in splatter filter

• Support mode selection ( Active, Rx, Standby and Inactive mode )

• FM Receiver
— Excellent Receiver characteristics

< 10.7MHz crystal filter used >

Input sensitivity

0.7µVrms at 12dB
SINAD

— RSSI ( Linear ) and Carrier detector output ( Digital ) function

• Compander
— Easy gain control and application using external component
—-Included ALC (Automatic Level Control) circuit

• Universal PLL
— RX (TX) divided counter range : 1/16 ~ 1/16383
— Reference frequency divided counter range : 1/16 ~ 1/4095
— Lock detector signal output
— Serial interface with MICOM for controlling each block
— Clock Output for MICOM oscillator substitution. ( X-tal divided clock by 2, 3, 4 and 5 )

Adjacent channel

rejection

> 55dB > 60dB > 50dB

Spurious rejection

(image of the second IF)

ORDERING INFORMATION

Device Package Operating Temperature

+ S1T8528X01-Q0R0 48−QFP−1010E −20C to + 70C

+ : New product

Intermodulation

rejection

1

S1T8528 ENHANCED-1 CHIP CT0 RF IC

BLOCK DIAGRAM

2LOI

1MO

1LOI

1LOI

VCO

RX

1MI
1MI

GND

(PLL)

PDR

V

REF

(RF)

V

(PLL)

TIF

REF

37

38
39
40

41

42
43

44

45

46

47

48

2LOI

36

X-tal
OSC

2MO

35

IF AMP

(455KHz)

2nd
MIX

RX
VCO

Internal

cap.

IF AMP
(10.7MHz)

1st

MIX

PLL Regulator

( 2.05 V )

Programmable Counter ( RX )

Programmable Counter ( TX )

Programmable Counter ( REF )

4_25 CNT

RX Phase
Detector

TX Phase
Detector

2MI

34 33

VCC

(RX)

(RX)

VCC

32 31

Limiting
IF AMP

Carrier
Detector

Splatter
Filter

LI

RSSI

LD

Quadrature

Detector

Buffer

fMCU

(RX)

GND

QCI

29 28 27

30

AMP

Low
Battery
Detector

CONTROL

RAO

DSCI

FSK
COMP

Rectifier

Gain Cell

Volume control

Limiter

Gain Cell

Rectifier

26

DSCO

SPK
AMP1

25

SUM
AMP

RSSI

Regulator
(Vcc/2)

PRE AMP

ALC

+

-

SUM
AMP

SPK
AMP2

-

+

MIC
AMP

Compander
mute

VREF

VREF

V

REF

24

(COMP)

23

ALC

22

EPI

21

ERC

EO

20

SAI

19

SAO1

18

SAO2

17

VCC

16

(COMP)

GND

15

(COMP)

CPI

14

13

CPO

PDT

CO

SFI

SFO

6

CDO/LDT

CLKO

CLK

DATA

EN

LBD

AGIC

121110 9 8 754 3 1 2

CRC

2

ENHANCED-1 CHIP CT0 RF IC S1T8528

CDO/LDT

PIN CONFIGURATION

VCO

GND

V

REF(RF)

V

REF(PLL)

2LOI

1MO
1LOI

1LOI

RX

1MI
1MI

(PLL)

PDR

37
38
39
40
41
42
43
44
45

46
47

36

2LOI

35

2MO

34 33

2MI

(RX)

VCC

LI

LD

32 31

30

S1T8528

KB8528

(RX)

GND

QCI

29 28

RAO

DSCI

27 26

DSCO

RSSI

25

24
23
22
21
20
19
18
17
16

15
14

V

REF(COMP)

ALC
EPI
ERC
EO
SAI
SAO1
SAO2
VCC

(COMP)

GND

(COMP)

CPI

TIF

48

1

PDT

2

CO

3

SFI

4 5 6

SFO

7

CLKO

CLK

8

DATA

9

EN

10

11

LBD

12

AGIC

13

CRC

CPO

3

S1T8528 ENHANCED-1 CHIP CT0 RF IC

PIN DESCRIPTION

Pin No Symbol Description

1 PDT Phase detector output terminal of the transmitter at PLL.

If fTX > f
If fTX < f
If fTX = f

2 CO Compressor output terminal of compander: connected to the splatter filter amp input

terminal.
3 SFI Input terminal of Splatter filter amp.
4 SFO Output terminal of Splatter filter amp.
5 LDT/CDO LDT: Output terminal of transmitter lock detector in PLL block. Output is low if PLL is in

CDO: As an output terminal of the carrier detector buffer, connected to (RSSI ) terminal

or fTX is leading → the output is negative pulse

REF

or fTX is lagging → the output is positive pulse

REF

and the same phase → the output is High Impedance

REF

lock state and is high if PLL is in unlock state.

of MICOM. This pin outputs the contents of Meter Driver buffer which is turned
on/off, according to the signal level detected by Meter Driver.

6 f

MCU

Clock output terminal for MCU crystal.

This pin provides the clock source for MCU or other system as an output of

X-tal osc. ÷ 2/ ÷3/ ÷4/ ÷5. Which can be controlled by the bit of the control register.

Clock ON/OFF control is possible by MCU
7

8
9

CLK
DATA
EN

These pins are serial interface terminals for programming reference counter, auxiliary

reference counter, TX channel counter, RX channel counter and control block that

controls internal each block with 4 mode selection.
10 LBD Low Battery Detecting output. ( Selectable 3.45V, 3.3V, 3.0V, 2.2V, 2.0V ).

During the normal operation, output level is low, but it is high at low battery detection.

As this pin is an open collector type, it requires a pull-up resister.
11 AGIC This pin bypasses AC elements at the feedback loop which come from the SUM amp

block of COMPRESSOR. A capacitor should be connected between this terminal and

GND. ( C = 2.2uF )
12 CRC Converts waveform from the full wave rectifier to DC element at the rectifier block of

Compressor. ( RC = 33 msec at C = 3.3uF)
13 CPO- Pre-amp output terminal of Compressor.

Used as an input terminal for voice signals.
14 CPI Inverting type Pre-amp input terminal of Compressor.
15 GND

(COMP

) Ground.

Ground of Compander.
16 Vcc

(COMP)

Supply voltage.

Power supply terminal of Compander.
17 SAO 2 Output terminal of speaker amp 2.

This signal is the same as SAO1 output, but phase difference is 180° for SAO1 DC

voltage level is Vcc / 2.

4

ENHANCED-1 CHIP CT0 RF IC S1T8528

PIN DESCRIPTION (Continued)

Pin No Symbol Description

18 SAO 1 Output terminal of Speaker amp 1.

DC voltage level is Vcc/ 2.

19 SAI Speaker Amp 1 input terminal.

Between this terminal and Expander output terminal, apply DC coupled capacitor.
20 EO Output terminal of Expander
21 ERC Converts waveform from the full wave rectifier to DC element at the rectifier block of

Expander. ( RC = 33 msec at C = 3.3uF )
22 EPI Pre-amp inverting input terminal of Expander.

Adjusts the negative feedback loop gain. ( in application, gain is 5 )
23 ALC Reference current input terminal of Automatic Level Control ( ALC); Adjusts THD of

compressor output voltage to less than 3% or limits the frequency deviation of TX if the

input is higher than a certain level. The ALC circuit may be turned off depending on the

ALC reference current or the magnitude of output voltage may be limited if it is higher

than a certain level.
24 V

REF(COMP)

Reference voltage ( VREF= 1/2 VCC ). Supplies a regulator voltage to the Compressor

and Expander of COMPANDER.
25 RSSI Received Signal Strength Indicator terminal ( Analog type )
26 DSCO Output terminal of Data Slicing comparator.

Separates Frequency Shift Keying ( FSK ) serial data and executes data shaping and

limiting.
27 DSCI Input terminal of Data slicing comparator.

Non-inverting type with the negative input terminal biased to 1/2 Vcc.
28 RAO Recovered Audio Output terminal. Voice signals detected by the Quadrature Detector

are amplified and then output through this terminal.
29 QCI Quadrature coil input terminal.

The 455kHz oscillator circuit is an Lp = 680uH, Cp = 180pF valued LC tank circuit.

Voice signals are detected by mixture of 455kHz ( by phase difference ) which is

converted from mixer 2.
30 GND

RX

Ground .

Ground for Receiver.
31

LD

Limiter input and decoupling terminal.

Limiter block removes amplitude modulation elements caused by fading or FM signal
32

LI

noise. Limiting IF stage makes the second intermediate frequency amplify and limit.

The input impedance of the limiting IF amplifier is set to 1.5kΩ.

While FM waves are transmitted with constant magnitude, their magnitudes are slightly

modulated due to reflection from obstacles, fading phenomenon, noise wave and

mixing with AM wave elements before entering the receiver’s antenna.

The limiter makes amplitude uniform by removing these AM wave elements.
33 V

CC(RX)

Supply voltage.

Supplies power to the Receiver.

5

S1T8528 ENHANCED-1 CHIP CT0 RF IC

PIN DESCRIPTION (Continued)

Pin No Symbol Description

34 2MI Input terminal of mixer 2. Output from mixer 1 is entered to mixer 2 input terminal via

10.7MHz ceramic filter. Second mixer converts frequency to second intermediate
frequency ( 455kHz: AM IF ).

35 2MO Output terminal of Mixer 2. Second intermediate frequency ( 455kHz ), generated by

mixing first intermediate frequency ( 10.7MHz ) and Second Local Oscillator is output.

36
37

2LOI
2LOI

Input terminal of second local oscillator. These pins generate 2’nd local oscillation
frequency and are designed as colpitt type oscillator.

10.24MHz or 10.245MHz can be applied as for 2’nd local oscillator.

38 1MO Output terminal of mixer 1.

The signal from mixer 1 and the frequency of the first local oscillator are mixed to
produce the first intermediate frequency, which is the output through this terminal. The
output terminal is an emitter follower with an output impedance of 330Ω to match the
330Ω input / output impedance of the 10.7MHz ceramic filter.

39
40

1LOI
1LOI

Input terminal of the first local oscillator.
The local oscillator is a voltage controlled oscillator. Local oscillation frequency and
received frequency are mixed at mixer 1 and then converted to the first intermediate
frequency of 10.7MHz or 10.695MHz.

41 VCO

RX

The terminal which variable capacitor is included in the chip. Used as an input terminal
where 1st local oscillation frequency is changed by varying the capacitor connected
between 1st local oscillator terminals.
The internal variable capacitor has the value of 18.73 ~ 15.86 pF depending on the
applied voltage. ( 1.0 ~ 2.0V )

42
43

44 GND

1MI
1MI

(PLL)

Input terminal of Mixer1. This mixer is made of doubly balanced multiplier.
The received signal amplified at RF AMP is input to this terminal.

Ground.
Ground for analog at PLL.

45 PDR Phase detector output terminal of the receiver at PLL.

If fRX > f
If fRX < f
If fRX = f

or fRX is Leading → The output is negative pulse

REF

or fRX is Lagging → The output is positive pulse

REF

and the same phase → The output is high impedance

REF

46 V

REF(RF)

An internal PMOS pass transistor provides power supplier for the RF pre amplifier.
PMOS pass transistor is on in Active/Rx mode and off in Standby/Inactive mode.

47 V

REF(PLL)

PLL voltage reference output pin.
An internal voltage regulator provides a stable power supply voltage for the RX and TX
PLLs. (2.05V)

48 TIF Input terminal of TX channel counter.

AC coupling with TX VCO.
Minimum input level is 300 mVp-p ( at 60MHz ).

6

ENHANCED-1 CHIP CT0 RF IC S1T8528

ABSOLUTE MAXIMUM RATINGS

Characteristic Symbol Value Unit

Maximum Supply Voltage Vcc 5.5 V
Power Dissipation P

Operating Temperature T
Storage Temperature T

D

OPR

SCG

600 mW

−20 — + 70 °C

−55 — + 150 °C

CURRENT CONSUMPTION AT EACH MODE ( VCC = 3.6V )

Modes Min. Typ. Max.

Active mode (Communication mode ) − 8.9mA −
RX mode − 4.8mA −
Stand-by mode − 700uA −
Inactive mode (Battery Saving Mode) − 50uA 70uA

CURRENT CONSUMPTION IN EACH BLOCK ( VCC = 3.6V )

Modes Min. Typ. Max.

Receiver part − 3.5mA 4.6mA
Expander part − 0.8mA 1.1mA
Speaker part − 1.0mA 1.4mA
compressor part − 1.7mA 2.1mA
PLL RX part − 1.2mA 1.6mA

TX part − 0.7mA 1.1mA

Total − 8.9mA 11.9mA

7

S1T8528 ENHANCED-1 CHIP CT0 RF IC

ELECTRICAL CHARACTERISTICS

Characteristic Symbol Test Conditions Min. Typ. Max. Unit

Operating Voltage Vcc − 2.0 − 5.5 V

RECEIVER

( VCC = 3.6V, fC = 49.7MHz, f
Sensitivity

(input for 12dB SINAD)

= ± 3kHz, f

DEV

V

SEN

= 1kHz,Ta = 25°C, unless otherwise specified )

MOD

MIX1 Matched Impedance

− 0.7 2.0 µVrms

Input

Input for -3dB Limiting V

LIM

MIX1 Matched Impedance

− 0.7 2.0 µVrms

Input
S/N Ratio S/N RFin = 1mVrms 48 55 − dB
Recovered Audio Output V

O(RA)

RFin = 1mVrms,

147 177 207 mVrms

After 2nd stage LPF
Recovered Audio Output

Voltage Drop
Detector Output Resistance R

Detect Output Voltage V
Detector Output Distortion THD

V

O(RAD

O(DET)

O(DET)

) Vcc = 5.5V → 2.0V

RFin = 1mVrms

RFin = 1mVrms − 1.2 − KΩ

RFin = 1mVrms 1.0 1.5 2.0 V

DET

RFin = 1mVrms

−3.0 −1.5 − dB

− 1.0 2.5 %

(with CCITT Filter)
Comparator Threshold

Voltage Difference
Comparator Output Voltage 1 V

Comparator Output Voltage 2 VOL V

First Mixer Conversion
Voltage Gain

∆V

∆G

TH

OH

V(1M)

V

R

V

R

R

V

= 360mVp-p

COMP

= 180KΩ

HYS

=360mVp-p

COMP

= 180kΩ

HYS

= 360mVp-p

COMP

= 180kΩ

HYS

MIX1 1/2

= 1mVrms

RL = 330kΩ

70 110 150 mV

Vcc-0.4 − − V

− 0.1 0.4 V

12 15 18 dB

Second Mixer Conversion
Voltage Gain

∆G

V(2M)

V

= 1mVrms

MIX2

RL = 1.5kΩ

18 22 26 dB

Demodulator Bandwidth DBW RFin = 1mVrms − 10 − kHz
Limiter Input Sensitivity V

I(LIM)

AM Rejection Ratio AMRR RFin = 1mVrms

Fc = 455kHz , −3dB Limiting − 20 40 uVrms

− 40 − dB

AM MOD = 30% @1kHz
First Mixer 3rd Order

Intercept Point
First Mixer Input Impedance R

First Mixer output Impedance Ro

8

IMD3 MIX1 Input 50Ω

Termination

C

I(1M)

I(1M)

(1M)

/

Fc = 50MHz − 690

Fc = 10.7MHz − 330 − Ω

− − 15 − dBm

− Ω

7.2

pF

ENHANCED-1 CHIP CT0 RF IC S1T8528

ELECTRICAL CHARACTERISTICS (Continued)

Characteristic Symbol Test Conditions Min. Typ. Max. Unit

Second Mixer input

R

I(2M)

Fc = 10.7MHz − 4 − kΩ

Impedance
Second Mixer output

Ro

(2M)

Fc = 455kHz − 1.5 − kΩ

Impedance
Carrier Detector Threshold CD

TH

MIX1 Single-Ended
Matching,

Default Threshold=1010

Low Battery Detector LBD LBD0 ~ LBD3 = 0 ( Default )

Only LBD2 = 0
Only LBD1 = 0
Only LBD3 = 0
LBD0 ~ LBD3 = 1

RSSI Slope V

RSSI

MIX1 Single-Ended
Matching

RSSI Output Voltage
Dynamic Range

Carrier Detect
Output High Voltage

Carrier Detect
Output Low Voltage

RSSI MIX1 Single-Ended

Matching

V

OH

RFin = 1µVrms
Default Threshold = 1010

V

OL

RFin = 10µVrms
Default Threshold = 1010

COMPRESSOR

( Vcc = 3.6V, fc = 1kHz, Ta = 25°C, unless otherwise specified )

− −95 − dBm

− 0.15 3.45

0.1 V

3.3

3.0

−0.1 2.2

0.075

2.1

− 30 − mV/dB

− 60 − dB

Vcc-0.4 − − V

− − 0.4 V

Standard Output Voltage Vo(com) Vinc = 63.2mVrms → 0dB

ALC disabled (pin 13)

Compressor Gain
Difference

Compressor Output

∆G
∆G

THD

V1(COM)
V2(COM)

COM

Vinc = −20dB −10 0 1.0 dB
Vinc = −40dB −1.5 0 1.5 dB
Vinc = 63.2mVrms → 0dB − 0.5 1.0 %

Distortion
Mute Attenuation Ratio ATT

Compressor Limiting Voltage V

MUTE

LIM(COM)

ALC VALC R
Splatter filter Vo(SF) V
Maximum Output Voltage V

OMIC(MAX)

Vinc = 0dB 60 80 − dB
Vinc = Variable 1.05 1.35 1.65 Vp-p

= 150kΩ, Vinc = 10dB 310 390 450 mVrms

ALC

= 63.2mVrms → 0 dB 269 316 363 mVrms

INC

RL = 10KΩ − 2.8 − Vp-p

EXPANDER

(Vcc = 3.6V, fc = 1kHz, Ta = 25°C, unless otherwise specified)
Standard Output Voltage V

O(EXP)

VinE = 63.2mVrms → 0dB 309 356 403 mVrms

269 316 363 mVrms

9

S1T8528 ENHANCED-1 CHIP CT0 RF IC

ELECTRICAL CHARACTERISTICS (Continued)

Characteristic Symbol Test Conditions Min. Typ. Max. Unit

Expander Gain Difference ∆G

∆G
∆G

Expander Output Distortion THD
Mute Attenuation Ratio ATT
Expander Maximum Output

V

OEXP(MAX)

Voltage
Maximum Output Voltage V

Input Current I

Input Voltage V

Output Current I

Output Voltage V

OSPK(MAX)

IH

I

IL

IH

V

IL

OH

I

OL

OH1

V1(EXP)
V2(EXP)
V3(EXP)

EXP

MUTE

VinE = −10dB −1.0 0 1.0 dB

VinE = − 20dB −1.5 0 1.5 dB

VinE =− 30dB −2.0 0 2.0 dB

VinE = 63.2mVrms → 0dB − 0.5 1.0 %

VinE = 63.2mVrms → 0dB 60 80 − dB

VinE = Variable

THD = 10%

800 − − mVrms

RL = 150Ω − 2.2 − Vp-p

RL = 600Ω − 3.0 - Vp-p

Vin = Vcc − − 5 µA

Vin = 0V −5 − − µA

− Vcc-0.3 − − V

− − − 0.3 V

Vout = Vcc 0.3 − − mA

Vout = 0V 0.3 − − mA

PDT,PDR: Io = -0.3mA

Vcc-0.4 − − V

( Sourcing )

PLL regulator voltage V
Regulator Load Current I

V

OL1

V

OH2

V

OL2

PLLREG

REG

PDT,PDR: Io = 0.3mA

( Sinking )

LD,f

: Io = − 0.1mA

MCU

( Sourcing )

LD,f

: Io = 0.1mA

MCU

( Sinking )

− 1.90 2.05 2.20 V

Vout = V

(OPEN)-0.05V − 3.0 − mA

REG

− − 0.4 V

Vcc-0.5 − − V

− − 0.5 V

10

ENHANCED-1 CHIP CT0 RF IC S1T8528

PLL PROGRAM SUMMARY

• MCU ( MICOM ) Serial Interface ( MSB : 1st INPUT )
Use CLK (Pin 7 ), DATA (Pin 8 ) , and EN (Pin 9 ) terminals for program.
DATA and CLK terminals are used for loading data to internal Shift - Register. When EN terminal is
‘Low’, It is possible to program TX-Channel Counter, RX - Channel Counter and various control
functions of PLL. When EN terminal is ‘High’, Program 1st Local Oscillator Capacitor Selection in
receiver for U.S.A - 25 CH function.

— TX - Register, RX-Register, Control Register

MSB LSB

DATA

PMC0 PMC1 14Bit DATA

EN

CLK

— Reference - Register

MSB LSB

DATA

PMC0PMC1UK_

EN

CLK

S1

UK_

S0

Figure 1.

12Bit DATA

Figure 2.

11

S1T8528 ENHANCED-1 CHIP CT0 RF IC

— Auxiliary - Register(16bits)

MSB LSB

DATA

PMC CD_TH(4bits) LBD(3bits) TEST(2bits)CLO(6bits)

EN

CLK

Figure 3.

• Programmable Counter

— RX - counter: Setting frequency for RX.VCO ( 14 Bits --> 1/16 ~ 1/16383 )

[ Default_CH. = USA_#21 ( REMOTE ) : 36.075MHz ( Div._NO = 7215 )]

< RX. Register (16bits) >

Bit Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8

Name PMC0 PMC1 D13 D12 D11 D10 D9 D8

Default value

* 0 1 1 1 0 0

7215

Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Name D7 D6 D5 D4 D3 D2 D1 D0

Default value

0 0 1 0 1 1 1 1

7215

— TX - counter: Setting frequency for TX.VCO ( 14 Bits --> 1/16 ~ 1/16383 )

[ Default_CH. = USA_#21 ( REMOTE ) : 49.830MHz ( Div._NO = 9966 )]

< TX. Register (16 bits) >

Bit Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8

Name PMC0 PMC1 D13 D12 D11 D10 D9 D8

Default value

* 1 0 0 1 1 0

9966

12

ENHANCED-1 CHIP CT0 RF IC S1T8528

Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Name D7 D6 D5 D4 D3 D2 D1 D0

Default value

1 1 1 0 1 1 1 0

9966

* Program Latch Assignl

PMC0 (Bit15) PMC1 (Bit14) Register Assign

0 0 Control
0 1 UPLL_Rx
1 0 UPLL_Ref
1 1 UPLL_Tx

— Ref - counter: Setting reference frequency for phase detector ( 12 Bits --> 1/16 ~ 1/4095 )

[ Default_Divider = 2048, X-tal_OSC = 10.240 MHz -->Fref = 5KHz ]< Ref. Register (16bits) >

< Ref. Register (16bits) >

Bit Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8

Name PMC0 PMC1 UK_S1 UK_S0 D11 D10 D9 D8

Default value

2048

* Ref.freq. selection

for United Kingdom

1 0 0 0

Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Name D7 D6 D5 D4 D3 fMCU_M FMCU1 FMCU0

Default value

2048

0 0 0 0 0 MPU CLK

Mute

MPU CLK

CNTl_1

— UK_Selection

UK_S0 UK_S1 FR1 FR2 FrefTX FrefRX

0 0 fREF (A) − fREF (A) fREF (A)
1 0 fREF (A) fREF/4 (B) fREF/4 (B) fREF/4 (B)
0 1 fREF/4 (B) fREF/25 (C) fREF/4 (B) fREF/25 (C)
1 1 fREF/4 (B) fREF/25 (C) fREF/25 (C) fREF/4 (B)

MPU CLK

CNTL_0

13

S1T8528 ENHANCED-1 CHIP CT0 RF IC

12 Bits Reference
program divider.

¡À4

¡À

25

fREF

(A)

fREF¡À4

(B)

fREF¡À25

(C)

FR1

FR2

LD

PD_TX

PDT

PDR

PD_RX

Figure 4. Reference frequency selection

• Control program

Control register (16 Bits)

Bit Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8

Name PMC0 PMC1 BS1 BS0 LBD_BS CO_M EX_M SPK_M
Description Program

Mode
Control_0

Program
Mode
Control_1

Power
Save
Control_1

Power
Save
Control_0

Low
Battery
Detector

Compressor
Mute

Expander
Mute

Speaker
Mute

Battery
Save

Function *

Program Latch

Assign

Power Save Mode

**

0:Normal
(LBD-On)
1:LBD-Part

0: Normal
1: Mute

0:Normal
1:Mute

0:Nomal
1:Mute

Power-Off

Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Name SPK3 SPK2 SPK1 SPK0 LDT/CDO fMCU_M fMCUS1 fMCUS0
Description SPK

Control_3

Function Speaker Volume Control 0: CDO

SPK
Control_2

SPK
Control_1

SPK
Conrol_
0

LDT/CDO
Select

1: LDT

MCU
Clock
Mute

0: Normal
1: Mute

MCU
Clock
Control_1

MCU
Clock
Control_0

***

MCU Clock Output

14

ENHANCED-1 CHIP CT0 RF IC S1T8528

** Power Save Mode Assign

BS1 (Bit13) BS0 (Bit12) Power Save Mode

0 0 Rx Default
0 1 Active
1 0 STD_By
1 1 Inactive

*** MCU Clock Output Control & Frequency

fMCU_M fMCUS1 fMCUS0 Clock Output

X-tal 10.24MHz 11.15MHz 12.0MHz

Divider

1 Don’t Care Don’t Care Low Divider
0 0 0 2 2 5.120MHz 5.575MHz 6.0MHz
0 0 1 3 3 3.413MHz 3.717MHz 4.0MHz
0 1 0 4 4 2.560MHz 2.788MHz 3.0MHz
0 1 1 5 (Default) 5 2.048MHz 2.230MHz 2.4MHz

*** Speaker Amplifier Volume Control

DATA Gain/Attenuation Output Level [SAO1-SAO2]

SPK3 SPK2 SPK1 SPK0

0 0 0 0 −18dB 25mVrms
0 0 0 1 −16dB −
0 0 1 0 −14dB −
0 0 1 1 −12dB 50mVrms
0 1 0 0 −10dB −
0 1 0 1 −8dB −
0 1 1 0 −6dB 100mVrms
0 1 1 1 −4dB −
1 0 0 0 −2dB −
1 0 0 1 0dB 200mVrms
1 0 1 0 +2dB −
1 0 1 1 +4dB −
1 1 0 0 +6dB 400mVrms
1 1 0 1 +8dB −
1 1 1 0 +10dB −
1 1 1 1 +12dB 800mVrms

15

S1T8528 ENHANCED-1 CHIP CT0 RF IC

• Auxiliary Register (16 Bits)

Auxiliary Register Function

Bit Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8

Name PMC CLO5 CLO4 CLO3 CLO2 CLO1 CLO0 CD_TH3
Description Auxiliary

register

Cap=5.9p Cap=4.8p Cap=3.2p Cap=1.6p Cap=1.3p Cap=0.8p CD_TH

Control_3

Selection

Function *****

Program
Mode

1’st LO Cap Select

CD
Control_3

Control

Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Name CD_TH2 CD_TH1 CD_TH0 LBD3 LBD2 LBD1 TEST2 TEST1
Description CD_TH

Control_2

Function Carrier Detector

Threshold Control

CD_TH
Control_1

CD_TH
Control_0

LBD
Control_3

LBD
Control_2

Low Battery Detector
Voltage Control

LBD
Control_1

TEST
Mode2

TEST
Mode1

**** TEST Mode &
LDT-CDO Mode

**** TEST Mode & LDT-CDO Mode

LDT/CDO TEST1 TEST2 LDT / CDO Remark

0 0 0 Rx block CDO Default

1 0 Rx block CDO −
0 1 4_25cnt block FR2 −
1 1 4_25cnt block FR2 −

1 0 0 PLL block LDT −

1 0 PLL block LDT −
0 1 Test PLL_RX −
1 0 Test PLL_TX −

16

ENHANCED-1 CHIP CT0 RF IC S1T8528

**** Carrier Detector Threshold Control

DATA

Carrier Detector Threshold

CD_TH3 CD_TH2 CD_TH1 CD_TH0

0 0 0 0 −20dB
0 0 0 1 −18dB
0 0 1 0 −16dB
0 0 1 1 −14dB
0 1 0 0 −12dB
0 1 0 1 −10dB
0 1 1 0 −8dB
0 1 1 1 −6dB
1 0 0 0 −4dB
1 0 0 1 −2dB
1 0 1 0 0dB (Default)
1 0 1 1 +2dB
1 1 0 0 +4dB
1 1 0 1 +6dB
1 1 1 0 +8dB
1 1 1 1 +10dB

17

S1T8528 ENHANCED-1 CHIP CT0 RF IC

• Operating internal circuit blocks in each mode

Mode ( state ) Operating circuit blocks

Active state
( Communication mode )

PLL regulator / MICOM I/F ( Data, CLK, EN ) / 2nd local oscillator / Receiver/ 1st
local oscillator/ RX PLL/ Carrier detector / FSK comparator / Low battery detector
/ TX PLL / Expander & speaker amp / Compressor /Splatter filter amp, Clock
Output

Receiving mode PLL regulator / MICOM I/F( Data, CLK, EN ) / 2nd local oscillator / Receiver/ 1st

local oscillator/ RX PLL/ Carrier detector / FSK comparator / Low battery
detector, Clock Output

Stand-by mode

PLL regulator, MICOM I/F ( Data, CLK, EN ), 2nd local oscillator, Clock Output

(Battery Save Mode#2)
Inactive state

Interrupt

(Battery Saving Mode#1)

• Auxiliary Register(CLO_LBD Program)
[ Rx - 1st local oscillation internal cap. for U.S.A - 25CH & low battery detecting voltage ]

— CLO register ( 6 bits ) : Receiver 1st local oscillator internal capacitor selection

Bit Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9

Name PMC CLO5 CLO4 CLO3 CLO2 CLO1 CLO0
Default

Value 0

1
*****

0 0 0 0 0 0

Function - 0:Normal

1:Internal
Cap. for
USA 25
Channel
=5.9pF

0:Normal
1:Internal
Cap. for
USA 25
Channel
= 4.8pF

0:Normal
1:Internal
Cap. for
USA 25
Channel
= 3.2pF

0:Normal
1:Internal
Cap. for
USA 25
Channel
=1.6pF

0:Normal
1:Internal
Cap. for
USA 25
Channel
=1.3p F

0:Normal
1:Internal
Cap. for
USA 25
Channel
= 0.8pF

18

ENHANCED-1 CHIP CT0 RF IC S1T8528

***** PMC ( Program Mode Control )

PMC = ‘HIGH’ & EN = ‘HIGH’ ---> Auxiliary Register Program Mode

— Rx-Low Battery Detect Voltage

Bit Bit15 (MSB) Bit 4 Bit 3 Bit 2 Low Battery Detector

Name PMC LBD3 LBD2 LBD1

Default

Value

1

*****

0 0 0 3.45V Default

Voltage

Function 1 1 0 1 3.3V −

1 1 1 0 3.0V −
0 0 1 1 2.2V −
1 1 1 1 2.1V −

***** PMC ( Program Mode Control )

PMC = ‘HIGH’ & EN = ‘HIGH’ ---> Auxiliary Register Program Mode

• Example 1 >
Low battery detector voltage : 2.1V
U.S.A _CH-#1 ( REMOTE ) ---> 1st local osc. varicap. value =15.86pF, Internal cap. = 9.3pF
( Ext_L = 0.45uH, EXT_C = 30pF )

— 16 bit data format

Remark

DATA

EN

CLK

MSB LSB

PMC LBD3 LBD2 LBD1

CLO5 CLO4 CLO3 CLO2 CLO1 CLO0

1 1 1 1

0 1 1 0 1 0

1( 0 ) 1( 0 ) 1( 0 ) 1( 0 ) 1( 0 )1( 0 )

Figure 5.

19

S1T8528 ENHANCED-1 CHIP CT0 RF IC

• Example data for U.S.A 25_channel selection

1st Local Osc. Internal Capacitor Select Base

Bit5

(CLO5)

Bit4

(CLO4)

Bit3

(CLO3)

Bit2

(CLO2)

Bit1

(CLO1)

Bit0

(CLO0)

Channels
1 ~ 25CH. 1 ~ 25CH. 1.0V~2.0V

Hand

Channels

0 0 0 0 0 0 16~25CH. 18.73

0 0 0 0 0 1 - 16~25CH. 18.73

0 0 0 0 1 1 01~04CH. 18.73

0 0 0 1 0 0 05~10CH. 18.73

0 0 0 0 0 1 11~15CH. 18.73

0 1 1 0 1 0 - 01~06CH. 18.73

0 1 0 1 1 0 - 07~15CH. 18.73

Phase detector / Lock Detector Output Waveforms

Varicap

Value

TYP 1.5V

~15.86pF

~15.86pF

~15.86pF

~15.86pF

~15.86pF

~15.86pF

~15.86pF

ExternalCExternalLInternal

C

27pF

0.45uH pF

(30pF)

27pF 0.44uH -

47pF 0.20uH 0.8

27pF 0.44uH 2.1

27pF 0.44uH 1.6

27pF 0.44uH 0.8

47pF 0.20uH 9.3

47pF 0.20uH 8.8

2LOI

TIF

12 Bits Reference
program divider.

14 Bits TX.
program divider.

fREF

fREF¡À4

¡À

4

fREF¡À25

¡À

25

Figure 6.

(A)

(B)

(C)

FR1

FR2

REF.Freq

TIF¡ÀN

LD

PD_TX

PDT

20

ENHANCED-1 CHIP CT0 RF IC S1T8528

REF.Freq.

TIF ¡ÀN

PDT

LD

Figure 7. Phase Detector / Lock Detector Output Waveform

21

S1T8528 ENHANCED-1 CHIP CT0 RF IC

APPLICATION CIRCUIT ( BASE SET )

RX out

RX data out

+

C37

C30

220uF

10k

R28

10k

R29

C40 10N

R27

33K

10N

C35

4.7uF

+

C36

C39

10N

R31

27k

R33

22k

100N

24

REF(COMP)

V

R32

470K

C41

33N

100N

C34

R26

120K

23

ALC

3.3uF

+

C33

C32

100N

18

19

20

21

22

EO

ERI

ERC

SAI

SAO1

Main power

C26

47uF

+

16

17

VCC

SAO2

Compressor

input

4.7n

C20

30K

R23

R15

240K

Data from MICOM (MCU)

To MICOM (MCU)

MICOM CLK

R16

2.2M
C30

150P

13

14

15

C25

CPI

GND

CPO

3.3uF

+

+

C24

2.2u

To MICOM (MCU)

R34

47K

T5

C42

68N

QCI RAO DSCI DSCO RSSI

(RX)

S1T8528

C43

10N

LI LD GND

(RX)

FLT3

455MHz

4.7k

R38

Y1

10.24MHz

36 35 34 33 32 31 30 29 28 27 26 25

2LOI 2MO 2MI VCC

1LOI

1MO

68P

C44

C45

20P

CV1

20P

S2

390

2LOI

39

38

37

C47

T4

FLT2

10MHz

C46

10N

22

R35

C48

RX

1MI

VCO

1LOI

42

41

40

30P

R35

AWI

C49

10N

T2

56K

100N

ANT

(PLL)

PDR

GND

1MI

45

44

43

AY

C57

4.7N

1.0K

R40

3.9K

R39

+

C52

0.47uF

L1

1BuH

REF(PLL)

REF(RF)

V

V

47

46

FLT1

25k544

PDT CO SFI SFO LTD/CDO 1MCU CLK DATA EN LBD AGIC CRC

TIF

48

C59

10N

+

C54

10uF

C51

10N

220

R37

RX

ANT

IN

C17

R11

10K

R10

1 2 3 4 5 6 7 8 9 10 11 12

TX

20K

TX VCO

DUPLEX

22

ENHANCED-1 CHIP CT0 RF IC S1T8528

APPLICATION CIRCUIT ( HAND SET )

C26

RX

DATA

out

+

C37

C30

220uF

10k

R28

10k

R29

R31

C40

R27

33K

10N

C35

4.7uF

+

C36

C39

10N

27k

10N

R33

1k

100N

24

REF(COMP)

V

R32

470K

C41

33N

100N

C34

R26

120K

23

ALC

3.3uF

+

C33

C32

100N

19

20

21

22

EO

ERI

ERC

SAI

2

1

16

17

18

VCC

SAO2

SAO1

10uF

+

MIC

R16

22K

R17

22K

C20

4.7N

R23

30K

R22

+

C27

47uF

15

GND

2.2M

Data from MICOM (MCU)

MICOM CLK

R15

240K

13

14

CPI

CPO

+

+

C24

To MICOM (MCU)

C25

3.3uF

2.2u

To MICOM (MCU)

R34

47K

T5

C42

68N

QCI RAO DSCI DSCO RSSI

(RX)

S1T8528

C43

10N

LI LD GND

C17

(RX)

FLT3

455MHz

Y1

10.245MHz

36 35 34 33 32 31 30 29 28 27 26 25

2LOI 2MO 2MI VCC

1LOI

1MO

68P

C44

C45

20P

CV1

20P

S2

390

2LOI

39

38

37

C47

T4

FLT2

107MHz

C46

10N

22

R35

RX

1MI

VCO

1LOI

42

41

40

47P

R35

AWI

C49

C48

10N

T2

56K

100N

2P

C50

T3

AY

(PLL)

PDR

GND

1MI

45

44

43

AY

C57

47N

1.0K

R40

3.9K

R39

+

C52

0.47uF

REF(PLL)

REF(RF)

V

V

47

46

FET1

25k544

PDT CO SFI SFO LTD/CDO 1MCU CLK DATA EN LBD AGIC CRC

TIF

48

C59

10N

+

C54

10uF

C51

10N

12N

C18

12N

R11

10K

R10

1 2 3 4 5 6 7 8 9 10 11 12

10K

TX VCO

220

R37

2P

C53

RX

TX

ANT

L1

1BuH

ANT

DUPLEX

23

S1T8528 ENHANCED-1 CHIP CT0 RF IC

S1T8528

TEST CIRCUIT

~

Vin40

~

Vin43

1uF

~

Vin48

+

10uF

100Ω

1§Ú

+

68pF

68pF

4.3§Ú

100§Ú

100§Ú 10nF

82§Ú

10nF

VCOR

33pF

0.47uH

T1(AW)

0.41uH

0.47uH

47pF

56§Ú100nF

18pF

1§Ú

47pF

47pF

KDS2236

Varicap

2Lo

S40

10uF 10nF

10uF 10nF

S48

56§Ú

1nF

S45

+

1uF

25pF

S41

+
+

VCOT

6.8§Ú

2MO

CO

2

1nF

390Ω

2MI

SFI

15§Ú
10nF

15§Ú

1uF

+

Vinc1

Vccrx

S34

1Mo

455KHz

VCC

(RX)

SFO

2Mo

LI

KB8528

CDO
LDT

S5

LD

CDo

1§Ú

1nF

0.1uF

GND

LD

(RX)

CLK

CLKO

CLK DATA EN

CLKO

RAo

680uH

68§Ú

180pF

10§Ú

QCI

RAO

EN

DATA

S9

10K S710K S810K

SFout

0.01uF

10§Ú

0.01uF

V28

DSCI

LBD

10

LBD

20pF

10nF

PDR

VREFRF

VREFPLL

TIF

2.7§Ú

10nF

5.1§Ú

47pF

S1

100§Ú

+

10uF

10.7MHz

10.240MHz

36 35 34 33 32 31 30 29 28 27 26 25

2LOI

37 24

2LOI

38

1MO

39

1LOI

40

1LOI

41

VCO(RX)

42

1MI

43

1MI

44

GND(PLL)

45

PDR

46

VREF(RF)

47

VREF(PLL)

48

TIF

PDT

1 3 4 5 6 7 8 9

PDT

100§Ú

Vc

+

2.2uF

+

0.47uF

10§Ú

Vin27

0.01uF

DSCO

AGIC

11 12

+

500§Ú-1000§Ú

1§Ú

DSCI

0.1uF

180§Ú

RSSI

VREF(COMP)

ALC

EPI

ERC

EO

SAI

SAO1

SAO2

VCC(COMP)

GND(COMP)

CPI

CPO

CRC

2.2uF

+

2.2uF

S25

23

22

21

20

19

18

17

16

15

14

13

150§Ú 100pF

100§Ú

15§Ú

RSSI

DSCO

VREFCOM

4.7uF

+

1uF

+

Vin22

2.2uF

Voe 10§Ú

+

150§Ù

30§Ú

1uF

+

100§Ú

1uF

+

Vinc

Vmico

150§Ú

S23

2.2uF

+

Vine1

SAo1

SAo2

Vcccom

10uF

+

10nF

24

ENHANCED-1 CHIP CT0 RF IC S1T8528

25

S1T8528 ENHANCED-1 CHIP CT0 RF IC

26

ENHANCED-1 CHIP CT0 RF IC S1T8528

27

S1T8528 ENHANCED-1 CHIP CT0 RF IC

28

ENHANCED-1 CHIP CT0 RF IC S1T8528

29

S1T8528 ENHANCED-1 CHIP CT0 RF IC

30

ENHANCED-1 CHIP CT0 RF IC S1T8528

31

S1T8528 ENHANCED-1 CHIP CT0 RF IC

32

ENHANCED-1 CHIP CT0 RF IC S1T8528

33

S1T8528 ENHANCED-1 CHIP CT0 RF IC

34

ENHANCED-1 CHIP CT0 RF IC S1T8528

NOTES

35