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XR-2103 Datasheet Preview

XR-2103 Datasheet

FSK Modem Filter

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XR-2103
FSK Modem Filter
GENERAL DESCRIPTION
The XR-2103 is a Monolithic Switched-Capacitor Filter de-
signed to perform the complete filtering function necessary
for a Bell 103 Compatible Modem. The XR-2103 is specifi-
cally intended for use with the XR-14412 ModulatorlDe-
modulator to form a complete stand alone two-chip mo-
dem. I n addition to complete high and low bandpass filters,
the XR-2103 contains internal mode switching, auto-zero-
ing limiter and dedicated duplexer op amp. An on board
carrier detect circu it is also included to complete the overall
system. Designed for crystal-controlled operation, the X R-
2103 operates from a 1.0 M Hz crystal or external clock.
Buffered clock output is provided for the X R-14412. A
self-test circuit is included.
The XR-2103, available in a 20 pin package, utilizes CMOS
technology for low power operation with a supply voltage
range from 4.75V to 6V.
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Single 5 Volt Operation
Complete On Board Output Active Filters
Low Supply Current
Internal Answer/Originate Mode Switching
Programmable I nput Receive Gain
Carrier Detect Output
Active Duplexer
APPLICATIONS
Bell 103 Transmit/Receive Filtering
Complement to XR-14412 or Other
Modulators/Demodulators
ABSOLUTE MAXIMUM RATINGS
Power Supply
16V
Power Dissipation Plastic Package
650mW
Derate Above 25°C
5.0 mWtC
Power Dissipation Ceramic Package
1.0W
Derate Above 25°C
8.0 mWtC
Operating Temperature
O°C to 70°C
Storage Temperature
-65°C to 150°C
Any Input Voltage
(VDD + 0.5V) to (VSS -0.5V)
ORDERING INFORMATION
Part Number
XR-2103CP
XR-2103CN
Package
Plastic
Ceramic
Operating Temperature
O°C to 70°C
O°C to 70°C
SYSTEM DESCRIPTION
The XR-2103 internally consists of four main signal blocks.
They are: input and output multiplexers to route the trans-
mit and receive signals to the proper filter and output, ac-
cording to the mode input; high and low band filters, 6
poles each, to perform precise bandpass filtering; output
RC active filters to perform output reconstruction and
filtering; carrier detection circuit for system interfacing.
An input amplifier with programmable gain is provided for
the receive signals. The XR-2103containsan internal clock
oscillator which accepts either a crystal or an external oscil-
lator of 1 MHz.
3-50




Exar

XR-2103 Datasheet Preview

XR-2103 Datasheet

FSK Modem Filter

No Preview Available !

XR-2103
ELECTRICAL CHARACTERISTICS
Test Conditions: VDD = 5V, VSS = OV, XIN = 1.0 MHz, T A = 25°C, unless specified otherwise.
SYMBOL
PARAMETERS
MIN TYP
MAX
UNIT
CONDITIONS
VDD
IDO
Power Supply Voltage Range
Power Supply Current
4.75
7
6
10
V VSS= 0
mA VDD = 5V
ANALOG SECTION
RECEIVE AMPLIFIER
VOS
AOL
IB
SR
Offset Voltage
Open Loop Gain
Input Bias Current
Slew Rate
Output Swing
-150
3
80
1
2
4.5
DUPLEXER
VOS
Isolation
Output Swing
Offset Voltage
3
-150
44
4.5
LIMITER
Output Symetery
Output Swing
Output Current
±1.5
4
100
CARRIER DETECT
Vth Threshold Voltage
Hysteresis
ton Turn On Time
toff Turn Off Time
LOW BAND FI LTER
fa Center Frequency
BW Bandwidth
Vfs Full Scale Input
Ar Pass Band Gain
DR Dynamic Range
PSRR
Power Supply Rej.
Pass Band Ripple
High Band Rejection
GD Differential (Group) Delay
Clock Feedthrough
-48
24
>100
.;;;100
1160
3
40
1170
500
2.5
4
50
15
200
-60
HIGH BAND FILTER
fa Center Frequency
BW Bandwidth
Vfs Full Scale Input
Ar Pass Band Gain
DR Dynamic Range
PSRR
Power Supply Rej.
Pass Band Ripple
Low Band Rejection
GD Differential (Group) Delay
Clock Feedthrough
2105
3
40
2125
500
2.5
4
50
18
200
-60
TRANSMIT
VOS
DC Offset Voltage
Output Swing
Output Current
-150
2.2
1.2
DIGITAL CMOS LOGIC LEVELS (VDD = 5V, VSS = 0 V)
Vih Input Voltage
Vii Input Voltage
1.5
loh Output Current
0.5
101 Output Current
1.0
loh Output Current
0.1
101 Output Current
0.2
2.75
2.25
1.5
5.0
1.5
0.9
150
150
±2.0
6
1180
5
2
500
2145
5
2
500
+150
3.5
mV
dB
pA
V/J,lS
Vp-p
dB
Vp-p
mV
%
Vp-p
IJ.A
dBm
dB
msec
msec
Hz
Hz
Vp-p
dB
dB
dB
dB
dB
J,lS
dBV
Hz
Hz
Vp-p
dB
dB
dB
dB
dB
J,lS
dBV
mV
Vp-p
mA
V
V
mA
mA
mA
mA
RL = 100k
RL = 100k to GND (Pin 2)
R2 = Line Resistance = 600n
Cc - 0.1 J,lf, from 50% Duty Cycle
RL = 1 meg
RL = lk
Receive Amplifier Gain -24 dB
Ccd = 0.1 J,lf, Vin =48 dBm, Gain = 24d6
f = 2 KHz
p-p 1070 Hz-1270 Hz
2025 Hz-2225 Hz
1070 Hz-1270 Hz
62.5 kHz
f = 1 kHz
p-p 2025 Hz - 2225 Hz
1070 Hz - 1270 Hz
2025 Hz - 2225 Hz
62.5 kHz
R2 = Line Resistance = 600n
'1' Level
'0' Level
'1' Level CLK OUT
'0' Level CLK OUT
'1' Level X OUT
'0' Level X OUT
3-51


Part Number XR-2103
Description FSK Modem Filter
Maker Exar
Total Page 5 Pages
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