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PDF MAX14890E Data sheet ( Hoja de datos )
| Número de pieza | MAX14890E | |
| Descripción | Incremental Encoder Interface | |
| Fabricantes | Maxim Integrated | |
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MAX14890E
Incremental Encoder Interface for RS-422,
HTL, and TTL with Digital Inputs
General Description
The MAX14890E incremental encoder receiver contains
four differential receivers and two single-ended receivers.
The differential receivers can be operated in RS-422 or
differential high-threshold logic (HTL) modes and are
optionally configurable for single-ended TTL/HTL operation.
The MAX14890E features a wide common mode input
range of -20V to +20V in RS-422 mode.
The auxiliary IEC 61131-2 Type-1/Type-3 digital inputs
are designed for operation with switches or proximity
sensors and can be individually configured for TTL operation.
All receiver input signals are fault protected to voltage shorts
in the ±40V range. Per channel fault detection provides
warning of irregular conditions such as small differential
signals, shorts, opens, overvoltages, and undervoltages.
The MAX14890E features a pin-selectable SPI or parallel-
logic interface. SPI control provides detailed diagnostics
and individual configurations for receivers.
The MAX14890E is available in a 32-pin TQFN-EP (5mm
x 5mm) and operates over the -40°C to +125°C tempera-
ture range.
Ordering Information appears at end of data sheet.
Typical Operating Circuit
ENCODER
RS-422 A
RS-422 B
RS-422 Z
TTL ALARM
PROXIMITY DO
SENSOR
PROXIMITY DO
SENSOR
120Ω
120Ω
120Ω
5V
VCC
A
RxA
A
B
RxB
B
Z
RxZ
Z
DIY
RxY
DI2 RxD2
VL
AO
AFAULT
BO
BFAULT
ZO
ZFAULT
YO
YFAULT
LO2
3.3V to 5V
5V
5V
5V
5V
DI3 RxD3
LO3
MAX14890
SNGL/CLK = 0
TTL/SDI = 1
DI/TTLY = 1
DI/TTL2 = 1
DI/TTL3 = 1
ASIC
COUNTER/
MOTOR
CONTROLLER
ENCODER CIRCUIT WITH RS-422 SIGNALS AND TTL ALARM SIGNAL
Benefits and Features
●● High Flexibility Supports All Encoder Types
• Selectable RS-422/HTL/TTL/DI Receivers
• RS-422/TTL Switching Rates Up to 35Mbps
• HTL Switching Rates Up to 400kHz
• SPI or Pin-Controlled Operation
• SPI Interface Allows Per-Receiver Configuration
• 1.62V to 5.5V Logic Interface
●● Integrated Fault Detection Reduces Down-Time
• Open-Wire and Short-Circuit Detection
• Overvoltage and Undervoltage Fault Detection
●● Integrated Protection Ensures Robust
Communication
• ±40V Fault Protection Range
• ±20V RS-422 Common Mode Range
• DI Glitch Filters
• ±25kV HBM ESD
• ±7kV Air-Gap per IEC 61000-4-2 ESD
• ±10kV Contact per IEC 61000-4-2 ESD
• -40°C to +125°C Operating Temperature Range
Applications
●● Encoder Interfaces
●● Motor Controllers
●● Pulse Counters
●● Servo Control Commutation
Input Receiver Modes
MODE
RxA RxB RxZ RxY RxDI2 RxDI3
RS-422 √ √ √ √
D-HTL
√ √√
SE-HTL √ √ √
TTL √ √ √ √
DI √ √
√
√
√
√
19-7536; Rev 0; 3/15
1 page  
MAX14890E
Incremental Encoder Interface for RS-422,
HTL, and TTL with Digital Inputs
Switching Characteristics
(VCC = 5V±10%, VL = 1.62V to VCC, TA = -40°C to +125°C unless otherwise noted. Typical values are at VCC = 5V, VL = 3.3V,
TA = +25°C.) (Notes 2, 3)
PARAMETER
SYMBOL
RECEIVER (RxA, RxB, RxZ) (Note 4)
RS-422 Maximum Data Rate
RS-422 Receiver Propagation
Delay
DRMAX422
tDPLH_422
tDPHL_422
CONDITIONS
RS-422 mode
RS-422 mode, CL = 15pF, VID = ±3V,
Figures 1, 2
RS-422 Receiver Propagation De-
tHL- RS-422 mode, CL = 15pF, VID = ±3V,
lay Skew |tDPLH_422 - tDPHL_422| SKEW_422 Figures 1, 2
RS-422 Receiver Channel-to-
Channel Skew
|tC- RS-422 mode, CL = 15pF, VID = ±3V,
SKEW_422| Figures 1, 2
Differential HTL (D-HTL) Maximum
Differential Data Rate
DRDHTL
D-HTL mode
MIN TYP MAX UNITS
35 Mbps
25
ns
25
0 5 ns
0 8 ns
1 Mbps
D-HTL Receiver Propagation
Delay
D-HTL Differential Receiver
Propagation Delay Skew
|tDPLH_DHTL - tDPHL_DHTL|
tDPLH_DHTL D-HTL mode, CL = 15pF, VID = ±24V,
tDPHL_DHTL Figures 1, 2
tHLSKEW_ D-HTL mode, CL = 15pF, VID = ±24V,
DHTL
Figures 1, 2
0
100
ns
100
20 ns
D-HTL Differential Receiver
Channel-to-Channel Skew
Single-Ended (SE-HTL) Maximum
Switching Rate
|tCSKEW_ D-HTL mode, CL = 15pF, VID = ±24V,
DHTL| Figures 1, 2
SRSEHTL SE-HTL mode, HITH is high or low
0
400
8 ns
kHz
SE-HTL Receiver Propagation
Delay
SE-HTL Receiver Propagation
Delay Skew
|tDPLH_SEHTL - tDPHL_SEHTL|
SE-HTL Receiver Channel-to-
Channel Skew
TTL Maximum Switching Rate
TTL Receiver Propagation Delay
TTL Receiver Propagation Delay
Skew (tDPLH_TTL - tDPHL_TTL)
tDPLH_
SEHTL
tDPHL_
SEHTL
tHLSKEW_
SEHTL
|tCSKEW_
SEHTL|
SRTTL
tDPLH_TTL
tDPHL_TTL
tHLSKEW_
TTL
SE-HTL mode, HITH is high or low,
CL = 15pF, 0V ≤ VIN ≤ +24V, Figures 1, 2
SE-HTL mode,
CL = 15pF,
0V ≤ VIN ≤ +24V
HITH is low
HITH is high
SE-HTL mode, HITH is high or low,
CL = 15pF, 0V ≤ VIN ≤ +24V, Figures 1, 2
TTL mode
TTL mode, CL = 15pF, 0V ≤ VIN ≤ +5V,
Figures 1, 2
TTL mode, CL = 15pF, 0V ≤ VIN ≤ +5V,
Figures 1, 2
0
0
0
0
0
400
0
100
ns
100
28
ns
20
11 ns
kHz
100
ns
100
52 ns
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX14890E
Incremental Encoder Interface for RS-422,
HTL, and TTL with Digital Inputs
Typical Operating Characteristics
(VCC = 5V, VL = 3.3V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
14
vs. DATARATE
to c 01
12
RS-422 MODE
D-HTL MODE
10
8
RxA and RxB switching, all other
inputs are low
6
0.1 1
DATA RATE (Mbps)
10
RS-422 AND TTL MODE PROPAGATION
70 DELAY vs. TEMPERATURE toc04
60
50
TTL, tPHL
TTL, tPLH
40
30 RS-422, tPHL
20
10
RS-422, tPLH
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
RxY/RxZ DI MODE PROPAGATION
300 DELAY vs. TEMPERATURE toc07
250 tPLH
200
150
100 tPHL
50
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
RS-422 RECEIVER DIFFERENTIAL
THRESHOLD VOLTAGE
200 vs. COMMON MODE VOLTAGE toc02
150
100
50 HIGH
0
-50 LOW
-100
-150
-200
-20 -15 -10 -5 0 5 10 15
COMMON MODE VOLTAGE (V)
20
D-HTL MODE PROPAGATION DELAY
100
vs. TEMPERATURE
to c 05
90
80
70
60
50 tPLH
40
tPHL
30
20
10
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
DI2/DI3 DI MODE PROPAGATION
3.0 DELAY vs. TEMPERATURE toc08
2.5
2.0 tPLH
1.5 tPHL
1.0
0.5
0.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
1000
800
600
400
200
0
-200
-400
-600
-800
-1000
0
D-HTL RECEIVER DIFFERENTIAL
THRESHOLD VOLTAGE
vs. COMMON MODE VOLTAGE toc03
HIGH
LOW
5 10 15 20 25
COMMON MODE VOLTAGE (V)
SE-HTL MODE PROPAGATION DELAY
100
vs. TEMPERATURE
to c 06
90
80
70
60 HITH = GND, tPLH
50 HITH = VL, tPLH
40
30
20
10 HITH = GND, tPHL
0
-40 -25 -10 5 20 35
HITH = VL, tPHL
50 65 80 95 110 125
TEMPERATURE (°C)
DI INPUT CURRENT
40
vs. INPUT VOLTAGE
to c 09
30
20
10
0
-10
-20
-30
-40
-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0
DI INPUT CURRENT (mA)
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX14890E.PDF ] | |
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