XR2211 Exar Corporation, XR2211 Datasheet - Page 5

• Manufacturer Part Number: XR2211
• Description: FSK Demodulator/ Tone Decoder
• Manufacturer: Exar Corporation

DC ELECTRICAL CHARACTERISTICS
Test Conditions:
Notes
Parameters are guaranteed over the recommended operating conditions, but are not 100% tested in production.
Bold face parameters are covered by production test and guaranteed over operating temperature range.
ABSOLUTE MAXIMUM RATINGS
Power Supply
Input Signal Level
Power Dissipation
SYSTEM DESCRIPTION
The main PLL within the XR-2211 is constructed from an
input preamplifier, analog multiplier used as a phase
detector and a precision voltage controlled oscillator
(VCO). The preamplifier is used as a limiter such that
input signals above typically 10mV rms are amplified to a
constant high level signal. The multiplying-type phase
detector acts as a digital exclusive or gate. Its output
(unfiltered) produces sum and difference frequencies of
the input and the VCO output.
current controlled oscillator with its normal input current
(f
with a resistor (R
The output of the phase detector produces sum and
difference of the input and the VCO frequencies
Parameter
Voltage Comparator Section
Input Impedance
Input Bias Current
Voltage Gain
Output Voltage Low
Output Leakage Current
Internal Reference
Voltage Level
Output Impedance
Maximum Source Current
O
) set by a resistor (R
Rev. 3.01
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
) from the phase detector.
. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
V
CC
0
) to ground and its driving current
= 12V, T
A
= +25 C, R
The VCO is actually a
Specifications are subject to change without notice
Min.
4.9
55
O
= 30K , C
(CONT’D)
900mW
3V rms
Typ.
0.01
100
300
100
20V
5.3
70
80
2
O
= 0.033 F, unless otherwise specified.
5
Max.
Package Power Dissipation Ratings
CDIP
PDIP
SOIC
(internally connected). When in lock, these frequencies
are f
when lock). By adding a capacitor to the phase detector
output, the 2 times f
DC voltage that represents the phase difference between
the two frequencies. This closes the loop and allows the
VCO to track the input frequency.
The FSK comparator is used to determine if the VCO is
driven above or below the center frequency (FSK
comparator). This will produce both active high and
active low outputs to indicate when the main PLL is in lock
(quadrature
comparator).
500
5.7
10
Derate Above T
Derate Above T
Derate Above T
IN
+ f
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCO
Unit
M
mV
nA
dB
V
A
A
(2 times f
phase
A
A
A
Conditions
Measured at Pins 3 and 8
R
I
V
Measured at Pin 10
AC Small Signal
C
= 25 C
= 25 C
= 25 C
O
IN
L
= 3mA
= 5.1K
IN
= 20V
component is reduced, leaving a
detector
when in lock) and f
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
XR-2211
and
lock
IN
60mW/ C
- f
8mW/ C
5mW/ C
750mW
800mW
390mW
VCO
detector
(0Hz