Document
WIDEBAND FM/FSK IF RECEIVER
S1T8531
INTRODUCTION
16-SOP-225 The S1T8531 is a wideband FM / FSK receiver designed for wideband FSK data and analog FM applications. It is fabricated using Samsung’s ASP5HB 0.5um advanced BiCMOS process. The S1T8531 contains high gain IF amplifier with received signal strength indicator (RSSI), a wideband FM quadrature demodulator, a baseband filter amplifier and a high speed data slicer with sample & hold function. The IF amplifier has 100dB small signal gain and 2MHz through 40MHz bandwidth. The wideband FM quadrature demodulator has demodulation bandwidth greater than 1MHz. The baseband filter amplifier is a wideband buffer and it can be configured as a second-order sallen-key low pass filter. The data slicer is a comparator that is designed to square up the data signal with data rates up to 2Mbps.
FEATURES
• • • • • • • Operating voltage range Typical supply current : 2.2 to 5.5V : 5.5mA at 3.6V
Operating frequency range : 2MHz to 40MHz High Gain (100dB) and Wideband (2MHz to 40MHz) IF Amplifier Quadrature Demodulator with Greater than 1MHz Bandwidth High Speed Data Slicer Operating Upto 2Mbps with Sample & Hold RSSI Dynmic range : Typ : 60dB
APPLICATION
• Wideband FM / FSK Wireless Communication Systems
ORDERING INFORMATION
Device +S1T8531X01-S0B0 + : New Product Package 16-SOP-225 Operating Temperature - 10°C to + 70°C
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S1T8531
WIDEBAND FM/FSK IF RECEIVER
BLOCK DIAGRAM
IFIN
16
IFIP
15
GND2
14
SHEN
13
RSSI
12
DSO
11
SHO
10
DSIN
9
Sample Hold A RSSI
5pF 1
1
2
3
4
5
6
7
8
GND1
VCC1
QIN
VCC2
QOUT
BIN
BOUT
DSIP
PIN CONFIGURATION
GND1 VCC1 QIN VCC2 QOUT BIN BOUT DSIP
1 2 3 4
16 15 14 13
IFIN IFIP GND2 SHEN RSSI DSO SHO DSIN
S1T8531
5 6 7 8 12 11 10 9
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WIDEBAND FM/FSK IF RECEIVER
S1T8531
PIN DESCRIPTION
Pin 1 2 3 Name GND1 VCC1 QIN
VCC 3
Schematic
Description Ground. (Pin1 and Pin14 are connected internally) Supply. (Pin2 and Pin4 are connected internally) Quadrature demodulator tank input.
4 5
VCC2 QOUT
VCC
Supply. (Pin2 and Pin4 are connected internally) Quadrature demodulator output.
5
6 7
BIN BOUT
VCC
Baseband filter buffer amplifier input. Baseband filter buffer amplifier output.
6
7
8 9
DSIP DSIN
8
VCC
Data slicer positive input. Data slicer negative input.
9
3
S1T8531
WIDEBAND FM/FSK IF RECEIVER
PIN DESCRIPTION (Continued)
Pin 10 Name SHO Schematic Description Sample and hold output.
7
11
DSO
VCC 11
Data slicer output.
12
RSSI
VCC
RSSI output.
12
13
SHEN
VCC
Sample and hold enable input. High signal input enable sample and hold function and low signal input disable sample and hold function .
13
14 15 16
GND2 IFIP IFIN
Ground. (Pin1 and Pin14 are connected internally) IF amplifier differential inputs. DC blocking is required.
VCC
15 16
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WIDEBAND FM/FSK IF RECEIVER
S1T8531
ABSOLUTE MAXIMUM RATINGS
Characteristic Maximum Supply Voltage Operating temperature Storage Temperature Symbol VCC Ta TSTG Value 6 -10 to + 70 -55 to + 150 Unit V °C °C
RECOMMENDED OPERATING CONDITIONS
Parameter Power Supply Voltage Voltage applied to any pin Symbol VCC VIN Value 2.2 to 5.5 - 0.3 to Vcc + 5.5 Unit V V
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S1T8531
WIDEBAND FM/FSK IF RECEIVER
ELECTRICAL CHARACTERISTICS
( Vcc = 3.6V, IF = 10.7MHz, fdev = ± 75kHz, fmod = 10kHz,Ta = 25°C, IFin = -47dBm unless otherwise noted. ) Characteristic Current consumption IF Input Frequency 20dB SINAD Sensitivity (Note 2) IF Amplifire Bandwidth (Note 1) IF Amplifier Voltage Gain (Note 1) IF Amplifier Input Impedance (Note 1) Quadrature Demodulator Output Voltage Demodulator Bandwidth (Notes 1 and 2) Baseband Filter Buffer Amplifier Bandwidth Baseband Filter Buffer Amplifier Voltage Gain Data Slicer Maximum Operating Frequency (Notes 1 and 2) RSSI Dynamic Range RSSI Output Level Symbol Icc IFfreq VSEN BWIF ∆G IF RIIIF Vo(DEM) BWDEM BWAMP DG AMP BWDS RSSI Vo(RSSI) Test Condition Min 2 2 95 100 0.6 1 -3 1 50 0.5 Typ 5.5 10.7 -95 101 1.5 150 1 2 0 2 60 Max 7.0 40 -81 40 200 +3 2.0 Unit mA MHz dBm MHz dB kΩ mVrms MHz MHz dB Mbps dB V
NOTES: 1. Not 100% AC tested but guaranteed by design and characterization. 2. Measured result on evaluation board with proper impedance matching.
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WIDEBAND FM/FSK IF RECEIVER
S1T8531
FUNCTIONAL DESCRIPTION
General The S1T8531 is a wideband FM / FSK receiver designed for use in analog FM and digital FSK systems such as 900MHz / 2.4GHz ISM band analog / digital cordless phones and wideband data links with data rates up to 2Mbps. It contains IF amplifier, quadrature detector, baseband filter amplifier and data slicer with sample and hold function. IF Amplifier The IF amplifier section is composed of seven differential stage with total gain of 100dB at 10.7MHz. The input impedance at 10.7MHz is 1.5kΩ. For 10.7MHz ceramic filter applications, an external 430Ω resistor must be placed between IFP(Pin15) and IFN(pin16) to provide the equivalent load impedance of 330Ω that is required by the filter. Quadrature Demodulator The quadrature d.