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XR-2276 Datasheet Preview

XR-2276 Datasheet

Bar Graph Display Generator

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XR·2276
Bar Graph Display Generator
GENERAL DESCRIPTION
The XR-2276 is a 12-point logarithmic bar graph display
generator designed for interfacing with fluorescent dis-
plays. The device's twelve comparators, internally bi-
ased at logarithmic intervals about an adjustable refer-
ence, controlling twelve fluorescent drivers. The XR-
2276 may also drive LEOs if the maximum device
power dissipation is not exceeded.
The XR-2276 is especially suited for generating 12-
point bar graphs or other multi-segment fluorescent
displays, such as those used for audio level-detector or
level-indicator applications.
FUNCTIONAL BLOCK DIAGRAM
INPUT
··20 dB
OUTPUTS
-10dS
7 dB
5dB
·3dB
GROUND
DdB
AQJUSTMENT
+8 dB
+3dB
., dB
OUTPUTS
DdB
-1 dB
+Vcc
FEATURES
High Input Impedance
Internal Pull-Down Resistors
Logarithmic Display Characteristics
External Reference Level Adjustment
APPLICATIONS
Bar-Graph Display Generator
12-Point Display Driver
Audio Level Indicator
Channel Separation Indicator
12-Point Digital Controller
Sequential Display Generator
ABSOLUTE MAXIMUM RATINGS
Power Supply
Input Signal Range
Output Current
Power Dissipation
Derate Above + 25°C
Operating Temperature
Storage Temperature
24V
-1V to +10V
5 mA
625mW
5 mW/oC
O°C to +70°C
-65°C to + 125°C
ORDERING INFORMATION
Part Number
XR-2276CP
Package
Plastic
Operating Temperature
O°C to +70°C
SYSTEM DESCRIPTION
The XR-2276 is a logarithimic level detection and fluo-
rescent display driver. The circuit is comprised of an in-
put buffer amplifier, 12 high gain comparators, an inter-
nal voltage reference and a bias-setting resistor string.
All of the twelve comparator stages have independent
buffered outputs.
Each of the comparators have a threshold level higher
than the preceeding comparator stage. With no input
signal, all of the comparators are "off" and all the out-
puts are at a low state. As the input level is increased,
the outputs successively switch to their high state. The
threshold levels are within the range of - 20 dB to + 8
dB with reference to a 0 dB level setting. The 12 ranges
are: -20dB, -15dB, -10dB, -7dB, -5dB, -3dB,
-1 dB, 0 dB, 1 dB, 3 dB, 5 dB, and 8 dB.
1-241




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XR-2276 Datasheet Preview

XR-2276 Datasheet

Bar Graph Display Generator

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XR·2276
ELECTRICAL CHARACTERISTICS
= =Test Conditions: Vee 18 Volts, TA 25°C, unless otherwise specified. (See Test Circuit of Figure 1)
PARAMETERS
Input Current
Output Low Voltage
Output High Voltage
Input Bias Voltage
Comparator Threshold
Voltages
o dB Output
- 20 dB Output
- 15 dB Output
- 10 dB Output
-7 dB Output
-5 dB Output
-3 dB Output
-1 dB Output
+ 1 dB Output
+3 dB Output
+5 dB Output
+8 dB Output
ODB
Adjust
Range
Comparator Threshold
Change with Supply
Supply Current
LIMITS
MIN TYP MAX
30 300
0 0.5
14.0 15.5
0.9 1.25 1.6
-
0.40
0.65
0.92
1.15
1.43
1.77
2.21
2.76
3.37
4.72
-0.6
2.10
0.3
0.46
0.73
0.99
1.23
1.52
1.88
2.34
2.93
3.66
5.12
+1
-2
-
0.52
0.83
1.07
1.30
1.61
2.00
2.49
3.10
3.97
5.56
+0.6
13 20
UNITS
nA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
Segments
dB
mA
SYMBOL
liN
VOL
VOH
VOS
Vc
tINC
ICC
CONDITIONS
VIN = 7.5 Volts
RL = 220 KG
Measured at each output
RL = 15 KG
Measured at each output
Input level above VOS
necessary to change
comparator state.
Measured at pin 11 after 0
dB adjustment
Measured at pin 2
Measured at pin 3
Measured at pin 4
Measured at pin 5
Measured at pin 6
Measured at pin 7
Measured at pin 10
Measured at pin 12
Measured at pin 13
Measured at pin 14
Measured at pin 15
10K Trim Pot from pin 16
to GND
VIN = 3.35V
~Vee = 6V
RL = 15 KG
VIN = 7.5V
RL = 220 KG, Vee = 18V
11(1:
v,. - l i N
(al
. - - - - - -_ICC 0 -Yee
..v
----------fT .
••
0,AL
_ _ _ _ ~_____
Vo
vc
(bl
Figure 1. Basic Test Circuit: (a) Circuit Connection, (b) Output Waveform.
1-242


Part Number XR-2276
Description Bar Graph Display Generator
Maker Exar
Total Page 5 Pages
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