iC-NV
6-BIT Sin/D FLASH CONVERTER
Rev B1, Page 1/18
TSSOP20
FEATURES
APPLICATIONS
Fast flash converter
Integrated glitch filter; minimum transition distance can be set
using the optional resistor
Selectable resolution of up to 64 steps per cycle and up to
16-fold interpolation
Integrated instrumentation amplifiers with adjustable gain
Direct connection of sensor bridges, no external components
required
200kHz input frequency with the highest resolution
Incremental A QUAD B output of up to 3.2MHz
Reversed A/B phase selectable
Index signal processing
Sensor bridge calibration supportable by analog/digital test
signals
Low power consumption from single 5V supply
TTL- /CMOS-compatible outputs
Inputs and outputs protected against destruction by ESD
Angle interpolation from ortho-
gonal sinusoidal input signals
Linear and rotary encoders
MR sensor systems
PACKAGES
BLOCK DIAGRAM
2002
iC-Haus GmbH
Tel +49-6135-9292-0
Integrated Circuits
Fax +49-6135-9292-192
Am Kuemmerling 18, D-55294 Bodenheim
http://www.ichaus.com
VCC
STEP/CYCLE SELECT
COS
CONVERSION CORE
+
-
-
+
INPUT SIN
DIGITAL
VCC
TRANSITION
TRANSITION
-
INPUT ZERO
-
+
VREF
DISTANCE CONTROL
+
INPUT COS
DISTANCE PRESET
-
+
GAIN SELECT
SIN
VCC
VREF
Z
SF0
SF1
SG0
SG1
VCC
VDD
NSIN
NZERO
PCOS
PSIN
PZERO
RCLK
ROT
A
B
GND
GNDA
NCOS
iC-NV
PROCESSING
iC-NV
6-BIT Sin/D FLASH CONVERTER
Rev B1, Page 2/18
DESCRIPTION
iC-NV is a monolithic A/D converter which produces two digital A/B incremental signals phase-shifted at 90
from two sinusoidal input signals, also phase-shifted at 90.
The converter operates on the flash principle with fast single comparators. The back-end signal processing
circuit includes a no-delay glitch filter which can be set so that only clearly countable incremental signals are
generated. The minimum transition distance for outputs A and B can be set via an external resistor and
adapted to suit the application on hand. For static input signals hysteresis prevents the switching of the
outputs.
By programming the pins the interpolator can be set to nine different resolutions between 4 and 64 angle
steps per cycle; multiplication values of between 1 and 16 are possible for the frequency. The phase relation
between the sine/cosine input signals and the A/B incremental signals generated can be selected here.
The device also incorporates an index signal processing circuit which generates a digital zero pulse at Z
dependent on the analog sine/cosine input signals and the enable input ZERO. Alternatively, the converter
MSB can also be output at Z for synchronization purposes in an absolute measuring system.
The input amplifiers are configured as instrumentation amplifiers and permit sensor bridges to be directly
connected without the need for external resistors. The input amplification has nine selectable settings which
have been graded to suit standard sensor signals of between ca. 10mVpk and 1Vpk. If external calibration of
the sensor bridge is required, eg. with regard to offset, various test functions can be activated. By this the
amplified analog input signals come available at the outputs, for instance.
PACKAGES TSSOP20 to JEDEC Standard
PIN CONFIGURATION TSSOP20 4.4mm
PIN FUNCTIONS
(top view)
No.
Name
Function
1
PCOS
Input Cosine
%
2
NCOS
Input Cosine
&
3
SG1 Gain
Select
4
SG0
Gain Select
5
VREF
Reference Voltage
6
ROT
A/B Phase Select
7
SF1
Resolution Select
8
SF0
Resolution Select
9
GND
Ground (digital)
10
Z
Output Index Z / MSB (ROT= hi)
11
B
Incremental Output B
12
A
Incremental Output A
13
VDD
+5V Supply Voltage (digital)
14
RCLK Setup
Resistor
(use is optional; can be wired to VCC or
requires resistor to GNDA)
15
VCC
+5V Supply Voltage (analog)
16
GNDA
Ground (analog)
17
PZERO
Input Zero Signal
%
18
NZERO
Input Zero Signal
&
19
PSIN Input
Sine
%
20
NSIN
Input Sine
&
External connections linking VCC to VDD and GND to GNDA
are required.
iC-NV
6-BIT Sin/D FLASH CONVERTER
Rev B1, Page 3/18
All voltages are referenced to ground unless otherwise noted.
All currents into the device pins are positive; all currents out of the device pins are negative.
ABSOLUTE MAXIMUM RATINGS
Values beyond which damage may occur; device operation is not guaranteed.
Item
Symbol
Parameter
Conditions
Fig.
Unit
Min.
Max.
G001 VCC
Supply Voltage analog
-0.3
6
V
G002 VDD
Supply Voltage digital
-0.3
6
V
G003 V()
Voltage at
NSIN, PSIN, NCOS, PCOS, NZERO,
PZERO, SG1, SG0, RCLK
SF1, SF0, ROT, A, B, Z
V() < VCC+0.3V
V() < VDD+0.3V
-0.3
6
V
G004 Imx(VCC)
Current in VCC
-50
50
mA
G005 Imx(GNDA) Current in GNDA
-50
50
mA
G006 Imx(VDD)
Current in VDD
-50
50
mA
G007 Imx(GND)
Current in GND
-50
50
mA
G008 Imx()
Current in
NSIN, PSIN, NCOS, PCOS,
NZERO, PZERO, SG1, SG0, VREF,
RCLK, SF1, SF0, ROT, A, B, Z
-10
10
mA
G009 Ilu()
Pulse Current in all pins
(Latch-up strength)
pulse duration < 10
s
-100
100
mA
EG1 Vd()
ESD Susceptibility at all pins
MIL-STD-883, Method 3015, HBM
100pF discharged through 1.5k
S
2
kV
TG1 Tj
Operating Junction Temperature
-40
150
C
TG2 Ts
Storage Temperature Range
-40
165
C
THERMAL DATA
Operating Conditions: VCC= VDD= 5V 10%
Item
Symbol
Parameter
Conditions
Fig.
Unit
Min.
Typ.
Max.
T1
Ta
Operating Ambient Temperature
Range
(extended range on request)
-25
85
C
iC-NV
6-BIT Sin/D FLASH CONVERTER
Rev B1, Page 4/18
ELECTRICAL CHARACTERISTICS
Operating Conditions: VCC= VDD= 5V 10%, Tj= -40..125C, unless otherwise noted
Item
Symbol
Parameter
Conditions
Tj
Fig.
Unit
C
Min.
Typ.
Max.
Total Device
001
VCC,
VDD
Permissible Supply Voltage
4.5
5.5
V
002
I(VCC)
Supply Current in VCC
fin()= 200kHz; A, B, Z open
15
mA
003
I(VDD)
Supply Current in VDD
fin()= 200kHz; A, B, Z open
5
mA
004
Vc()hi
Clamp Voltage hi at
NSIN, PSIN, NCOS, PCOS,
NZERO, PZERO, SG1, SG0,
ROT, SF1, SF0, VREF, RCLK
Vc()hi= V() -VCC;
I()= 1mA, other pins open
0.3
1.6
V
005
Vc()lo
Clamp Voltage lo at
NSIN, PSIN, NCOS, PCOS,
NZERO, PZERO, SG1, SG0,
ROT, SF1, SF0, VREF, RCLK,
A, B, Z
I()= -1mA, other pins open
-1.5
-0.3
V
006
Vc()hi
Clamp Voltage hi at
A, B, Z
Vc()hi= V()-VDD;
I()= 1mA, other pins open
0.3
1.6
V
Input Amplifiers NSIN, PSIN, NCOS, PCOS
101
Vos()
Input Offset Voltage
Vin() see table gain select
GAIN= 10..66
GAIN= 3..7.1
-7
-10
7
10
mV
mV
102
Iin()
Input Current
V()= 0V.. VCC
-50
50
nA
103
G()
Gain
GAIN following table gain select
95
101
%
104
Grel
Gain Ration SIN/COS
GAIN following table gain select
98
102
%
105
fhc
Cut-off Frequency
GAIN= 66.667
GAIN= 3.03
500
2.3
kHz
MHz
106
SR
Slew Rate
GAIN= 66.667
GAIN= 3.03
10
15
V/s
V/s
Signal Processing: Converter Accuracy
201
AAabs
Absolute Angle Accuracy
referred to 360 input signal,
GAIN= 3.03
-1
1
DEG
202
AArel
Relative Angle Accuracy
referred to period of A, B
GAIN= 3.03
7
-10
10
%
VREF
401
V(VREF) Reference Voltage at VREF
I(VREF)= -1mA..+1mA
48
52
%VCC
Signal Processing: Transition Distance Control
501
RCLK
Permissible Resistor at
RCLK vs. GNDA
DIV= 1
DIV= 16
50
3
500
500
k
S
k
S
502
DT()
Minimum Transition Distance
R(RCLK, GNDA)= 47K
S
1%;
DIV= 1
DIV= 16
4
2
45
490
78
1000
ns
ns
503
DT()
Minimum Transition Distance
V(RCLK)= VCC;
DIV= 1
DIV= 16
30
420
78
1000
ns
ns
iC-NV
6-BIT Sin/D FLASH CONVERTER
Rev B1, Page 5/18
ELECTRICAL CHARACTERISTICS
Operating Conditions: VCC= VDD= 5V 10%, Tj= -40..125C, unless otherwise noted
Item
Symbol
Parameter
Conditions
Tj
Fig.
Unit
C
Min.
Typ.
Max.
Fig. 1: Adjusting the minimum transition distance
via resistor RCLK (given typical at 5V, 27C; for
IPF= 1 within 5V 10% and -40..+125C ranges).
Fig. 2: Similar to Figure 1; the minimum transition
distance can be reduced by smaller resistors
RCLK.
Zero Comparator
701
Vos()
Input Offset Voltage
V()= Vcm()
-20
20
mV
702
Iin()
Input Current
V()= 0V.. VCC
-50
50
nA
703
Vcm()
Common-Mode Input Volt. Range
1.4
VCC-1.5
V
704
Vdm()
Differential Input Voltage Range
0
VCC
V
Signal Processing: Inputs SG1, SG0, ROT, SF1, SF0
801
Vt()hi
Input Threshold Voltage hi
60
78
%VCC
802
Vt()lo
Input Threshold Voltage lo
25
40
%VCC
803
V0()
Mid Level Voltage
43
57
%VCC
804
Ri()
Input Resistance
45
150
220
k
S
Signal Processing: Outputs A, B, Z
D01 Vs()hi
Saturation Voltage hi
Vs()hi= VDD-V(); I()= -4mA
0.4
V
D02 Vs()lo
Saturation Voltage lo
I()= 4mA
0.4
V
D05 tr()
Rise Time
CL()= 50pF
60
ns
D06 tf()
Fall Time
CL()= 50pF
60
ns
ELECTRICAL CHARACTERISTICS: Diagrams
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