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PDF SM3471AB Data sheet ( Hoja de datos )
| Número de pieza | SM3471AB | |
| Descripción | Interpolation Encoder IC | |
| Fabricantes | NPC | |
| Logotipo |  |
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SM3471AB
Interpolation Encoder IC
OVERVIEW
The SM3471 is an interpolation IC for encoders. It accepts displacement detection, 2-phase analog signals (A and B phases) and a zero
point detection analog signal (Z phase) from an encoder, interpolates the signals by a specified interpolation factor, and outputs
corresponding 2-phase digital signals (Aand B phases) and a zero point detection digital signal (Z phase).
FEATURES
▪ Interpolation switching function: ×2, 4, 8, 16 (selectable)
▪ Input frequency: 300kHz (max)
▪ Output frequency: 2.5MHz (max)
▪ Supply voltage: 2.7 to 5.5V
▪ Operating temperature range: –40 to +125°C
▪ Package: QFN24 (size: 4mm × 4mm)
ORDERING INFORMATION
Device
SM3471AB-G*1
Package
24 pin QFN
*1. “-G” option code lead-free package
PACKAGE DIMENSIONS
0.2 S A
4.00±0.1
A
B
0.75
C0.11
2.40 ±0.1
// 0.2 S
S
0.08 S
0.15
0.50
0.22±0.05
0.05 M S AB
[unit:mm]
SEIKO NPC CORPORATION - 1
1 page  
SM3471AB
Electrical Characteristics
VDD=2.7 to 5.5V, VSS=0V, Ta=–40 to +125°C unless otherwise noted
Parameter
Current consumption*1
Logic input voltage*2
Logic input current*2
Output voltage*3
Output frequency
Angular error*4
(max – min)
Symbol
IDD
VIH
VIL
IIH
IIL
VoutH
VoutL
fout
ARAL
Condition
No load
VIN=VDD, Ta=25°C
VIN=VSS, Ta=25°C
Iout = +1.5mA
Iout = –1.5mA
VDD=5.0V,
16x interpolation,
Input ideal sin(cos) wave,
10kHz input frequency,
3.0Vppinput amplitude
MIN
-
0.7VDD
VSS
20
–1
VDD–0.4
-
-
TYP
15
-
-
-
-
-
-
-
MAX
25
VDD
0.3VDD
200
-
-
0.3
2.5
Unit
mA
V
μA
V
MHz
- - 6 Degrees
Rise/Fall time
trf 0.1VDD to 0.9VDD,CL=20pF
-
- 10 ns
*1. Typical conditions: VDD=5V, Ta=25°C, 8x interpolation, FIN=10kHz
*2. SEL0, SEL1, and ZSEL terminals.
*3. DA, DB, and DZ terminals.
*4. The angular error expresses the variation from the ideal phase difference of interpolation outputs DA and DB as a phase difference of the input period.
Converting 6° and expressing as a percentage of the output period gives 26.6% using equation (1) below.
6 deg×16x
360 deg
=
26.6%
(1)
(where 16x is the interpolation factor)
A(cos)
B(sin)
TPIN : input period
TPOUT : output period
16x DA
multiplier DB
TPOUT : output period
DA
DB
ARAL_OUT
Conversion to output period reference
TPOUT = TPIN / Multiplier = 360deg
ARAL_OUT = 6deg × 16 = 96deg
= 6deg × 16 = 26.6%
360deg
SEIKO NPC CORPORATION - 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SM3471AB.PDF ] | |
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