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ETIC

ET2015 Datasheet Preview

ET2015 Datasheet

INTERPOLATION DEVICE

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INTERPOLATION DEVICE
(Interpolation factors of 1X or 5X)
ET2015
FEATURES
Interpolation factor pin selectable (1X/5X)
Index gating pin selectable (90/180 electrical
degrees of interpolated pulse)
Leading edge of gated index pulse occurs at
270 electrical degrees of analog input cycle,
regardless of interpolation factor selected
Interfaces directly with ET2010 Analog
Signal Processor and ET7272 Line Driver
Single supply operation
Handles Sine/Cosine inputs from DC to
125KHz
Sine/Cosine input voltage range 400mVpp to
4Vpp on 2.5VDC reference
Outputs are NPN Collector with 4K pull-up;
sink up to 4mA external load
Outputs TTL and CMOS compatible
DESCRIPTION
This ET2015 is a monolithic bipolar integrated circuit designed to facilitate increased resolution in optical encoder
applications by converting the incoming sine and cosine signals to an interpolated quadrature digital output at 1 or
5 times the input frequency. Please refer to the Timing Diagram. The device inputs receive photodiode signals
which have been amplified and conditioned to optimize the interpolation function. This conditioning may be
obtained from a companion device, the analog signal processor, ET2010. Following interpolation processing by the
ET2015, the output signal can be fed into a line driver device, such as the ET7272B, for driving extended loads.
Please see the Application Circuit.
In addition to processing the data channel information, the ET2015 provides a channel for the index signal which
controls the gating of the index pulse relative to the 0° and 90° input waveforms. Index gating is provided to
generate a pulse that commences at 270 electrical degrees of the analog input cycle. Width of the index pulse is
either 90 or 180 electrical degrees of the interpolated pulse (pin selectable).
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Operating Temperature Range
Storage Temperature Range
Supply Voltage Range
TA
TS
VCC
Min.
-40
-55
4.5
Max.
120
150
5.5
Units Comments
°C
V
Page 1 of 5
East Texas Integrated Circuits, 275 W. Campbell Rd. Suite 310, Richardson, TX 75080 ph.(972)234-5656 fax (972)234-5657
E-mail to Sales@etic-avago.com or visit our website, www.etic-avago.com .




ETIC

ET2015 Datasheet Preview

ET2015 Datasheet

INTERPOLATION DEVICE

No Preview Available !

ELECTRICAL CHARACTERISTICS
Unless otherwise specified, typical values given at VCC=5V, TA = 25°C, and VIN = 1.6V(P-P).
Parameters
Analog Supply Current
Digital Supply Current
Hysteresis REF Voltage
SIG_REF Input Current @ 2.5V
Z_SIG Input Current
0_SIG, 90_SIG, and 180_SIG
Input Current
Low Level Output Voltage
High Level Output Voltage
Quadrature Interpolation Factors
Quadrature Error (1X mode)
Quadrature Error (5X mode)
Frequency Response at Digital
Internal Pull-up Resistor
Symbol
ICCA
ICCD
VREF
ISIG_REF
IZ SIG
VOL
VOH
E1X
E5X
fCO
RINT
Min.
--
--
2.4
--
--
-2
--
4.4
1X
-22
-45
500
3.1
Typ.
13.0
4.9
--
-5
<1
--
325
4.6
--
NOTES:
1. This is not a test parameter, but guaranteed by design.
2. Unused inputs should be connected to ground.
Max.
19.0
7.0
2.7
-50
10
2
Units
mA
mA
V
uA
µA
mA
Test Conditions
VCC = 5.5V
VCC = 5.5V
VIN = 0V, VZ = 5.5V
500 mV
-- V
5X
IOL = 4mA
IOH = -100uA
22 ed VIN = 1.6Vpp
45 ed VIN = 1.6Vpp
-- KHz Note 1
5.2 KOhm Note 1
PIN #
2
3
5
6
7,8,9
10
11
12
13
14,16,18
20
15,17,19
PIN FUNCTION TABLE
PIN NAME
HYSTERESIS_REFERENCE
ANALOG_VCC
ANALOG _GND
SIGNAL_REFERENCE
0_SIG, 90_SIG, 180_SIG
Z_SIG
Z180_SEL
5X_SEL
D_GND
B_OUT, Z_OUT, A_OUT
D_VCC
FUNCTION
Intended to be left open.
Voltage supply for analog portion of circuit. Bypass to A_GND.
Return for analog supply voltage.
An input and the DC offset level of the sine wave inputs. Bypass to
A_GND.
Sine wave inputs. When 0_SIG leads 90_SIG, then A leads B at
the quadrature outputs. Amplitude should be about 1.6Vpp.
High impedance input with comparator threshold at 2.5V.
High impedance input to select width of the index pulse. When
>2.5V, Z_OUT= 180/X electrical degrees, gated on B_LOW. When
<2.5V, Z_OUT= 90/X electrical degrees, gated on (A_LOW AND
B_LOW).
High impedance input to select interpolation factor. When >2.5V,
the factor is 5X and when <2.5V the factor is 1X.
Return for the digital supply voltage.
NPN open collector with internal 4K pull-up resistor.
Voltage supply for the digital portion of circuit. Bypass to D_GND.
n/c While there is no internal connection, these pins should be tied to
D_GND on the PCB to shield against output-output crosstalk.
Page 2 of 5
East Texas Integrated Circuits, 275 W. Campbell Rd. Suite 310, Richardson, TX 75080 ph.(972)234-5656 fax (972)234-5657
E-mail to Sales@etic-avago.com or visit our website, www.etic-avago.com .


Part Number ET2015
Description INTERPOLATION DEVICE
Maker ETIC
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ET2015 Datasheet PDF






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