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Part: EL1881CS-T13
Category:
Multimedia
-> Video
-> Processors
-> Sync/Deflection
Description: SYNC Separator, Low Power
Company: Elantec Semiconductor, Inc. (acquired by Intersil)
Datasheet: Download EL1881CS-T13 datasheet File size : 172 kB
Request For quote: Find where to buy EL1881CS-T13
Datasheet text preview:
EL1881C
EL1881C
Sync Separator, Low Power
Features
· NTSC, PAL, SECAM, nonstandard video sync separation · Fixed 70mV slicing of video input levels from 0.5VP-P to 2VP-P · Low supply current - 1.5mA typ. · Single +5V supply · Composite, vertical sync output · Odd/even field output · Burst/back porch output · Available in 8-pin PDIP and SO packages
General Description
The EL1881C video sync separator is manufactured using Elantec's high performance analog CMOS process. This device extracts sync timing information from both standard and non-standard video input. It provides composite sync, vertical sync, burst/back porch timing, and odd/even field detection. Fixed 70mV sync tip slicing provides sync edge detection when the video input level is between 0.5VP-P and 2VP-P (sync tip amplitude 143mV to 572mV). A single external resistor sets all internal timing to adjust for various video standards. The composite sync output follows video in sync pulses and a vertical sync pulse is output on the rising edge of the first vertical serration following the vertical pre-equalizing string. For non-standard vertical inputs, a default vertical pulse is output when the vertical signal stays low for longer than the vertical sync default delay time. The odd/even output indicates field polarity detected during the vertical blanking interval. T h e EL1881C is plug-in compatible with the industry-standard LM1881 and can be substituted for that part in 5V applications with lower required supply current. The EL1881C is available in the 8-pin PDIP and SO packages and is specified for operation over the full -40°C to +85°C temperature range.
Applications
· · · · · · · · · Video amplifiers PCMCIA applications A/D drivers Line drivers Portable computers High-speed communications RGB applications Broadcast equipment Active filtering
Connection Diagram
Ordering Information
Part No. EL1881CN EL1881CS EL1881CS-T7 EL1881CS-T13 Package 8-Pin PDIP 8-Pin SO 8-Pin SO 8-Pin SO Tape & Reel 7" 13" Outline # MDP0031 MDP0027 MDP0027 MDP0027
Composite Sync Out 1 Composite Video In 2 Vertical Sync Out 3 GND 4
8 VDD 5V 7 Odd/Even Output 6 RSET 5 Burst/Back Porch Output
Demo Board
A dedicated demo board is available.
September 18, 2001
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a "controlled document". Current revisions, if any, to these specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.
EL1881C
EL1881C
Sync Separator, Low Power
Absolute Maximum Ratings (T
VCC Supply Storage Temperature Pin Voltages
A
= 25°C)
7V -65°C to +150°C -0.5V to VCC +0.5V
Operating Ambient Temperature Range Operating Junction Temperature Power Dissipation
-40°C to +85°C 150°C 400mW
Important Note: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA.
DC Characteristics
VDD = 5V, TA = 25°C, RSET = 681k, unless otherwise specified. Parameter IDD, Quiescent Clamp Voltage Clamp Discharge Current Clamp Charge Current RSET Pin Reference Voltage VOL Output Low Voltage VOH Output High Voltage VDD = 5V Pin 2, ILOAD = -100µA Pin 2 = 2V Pin 2 = 1V Pin 6 IOL = 1.6mA IOH = -40µA IOH = -1.6mA 4 3 Description Min 0.75 1.35 6 -1.3 1.1 Typ 1.5 1.5 12 -1 1.22 0.24 4.8 4.6 Max 3 1.65 16 0.7 1.35 0.5 Unit mA V µA mA V V V
Dynamic Characteristics
Parameter Comp Sync Prop Delay, tCS Vertical Sync Width, tVS Vertical Sync Default Delay, tVSD Burst/Back Porch Delay, tBD Burst/Back Porch Width, tB Input Dynamic Range Slice Level See Figure 2 Normal or Default Trigger, 50%-50% See Figure 3 See Figure 2 See Figure 2 Video Input Amplitude to Maintain 50% Slice Spec VSLICE/VCLAMP Description Min 20 190 35 120 2.5 0.5 55 70 Typ 35 230 62 200 3.5 Max 75 300 85 300 4.5 2 85 Unit ns µs µs ns µs VP - P mV
2
EL1881C
EL1881C
Sync Separator, Low Power
Pin Descriptions
Pin Number 1 2 3 4 5 6 7 8 Pin Name Composite Sync Out Composite Video In Vertical Sync Out GND Burst/Back Porch Output RSET [1] Odd/Even Output VDD 5V Pin Function Composite sync pulse output; sync pulses start on a falling edge and end on a rising edge AC coupled composite video input; sync tip must be at the lowest potential (positive picture phase) Vertical sync pulse output; the falling edge of vert sync is the start of the vertical period Supply ground Burst/back porch output; low during burst portion of composite video An external resistor to ground sets all internal timing; a 681k 1% resistor will provide correct timing for NTSC signals Odd/even field output; high during odd fields, low during even fields; transitions occur at start of vert sync pulse Positive supply (5V)
1. RSET must be a 1% resistor
3
EL1881C
EL1881C
Sync Separator, Low Power
Typical Performance Curves
Supply Current vs Temperature RSET=681k 5.5V 5V Supply Current (mA) 1.55 1.5 1.45 1.4 1.35 -50 1.495 1.485 -50 4.5V VCLAMP (V) 1.515 1.505 VCLAMP Voltage vs Temperature RSET=681k 5.5V 1.525 4.5V 5V
1.65 1.6
1.535
-25
0
25 Temperature (°C)
50
75
100
-25
0
25 Temperature (°C)
50
75
100
11.4 11.3 Clamp Discharge Current (µA) 11.2 11.1 11 10.9 10.8
Clamp Discharge Current vs Temperature RSET=681k
1.24 1.235
VRSET vs Temperature RSET=681k 5.5V 5V 4.5V
5.5V 5V 4.5V
1.23 VRSET (V) 50 75 100 1.225 1.22 1.215 1.21 1.205
10.7 -50
-25
0
25 Temperature (°C)
1.2 -50
-25
0
25 Temperature (°C)
50
75
100
1.1 1.05 1
Clamp Charge Current vs Temperature RSET=681k
RSET vs Horizontal Frequency 1000 800 600 400 200 0 10
Clamp Charge Current (mA)
5.5V
5V 0.95 0.9 0.85 -50
4.5V
-25
0
25 Temperature (°C)
50
75
100
RSET (k)
15
20
25
30
35
40
45
Frequency (kHz)
4
EL1881C
EL1881C
Sync Separator, Low Power
Typical Performance Curves
Burst/Back Porch Width vs RSET VDD=5V, TA=25°C Burst/Back Porch Delay vs RSET VDD=5V, TA=25°C
6 5 Burst Width (µS) 4 3 2
350 300 Burst/Back Porch Delay (ns) 250 200 150 100 50
1 200
400
600 RSET (k)
800
1000
0 200
400
600 RSET (k)
800
1000
350 300 250 200 150 100 50
Vertical Sync Width vs RSET VDD=5V, TA=25°C
120 100 80 60 40 20
Vertical Default Delay vs RSET VDD=5V, TA=25°C
Vertical Sync Default Delay (µS)
Vertical Sync Width (µS)
0 200
400
600 RSET (k)
800
1000
0 200
400
600 RSET (k)
800
1000
Composite Sync Prop Delay vs Temperature 41 39 37 35 33 31 -50 3.9 3.8 Composite Sync Prop Delay (ns) Burst/Back Porch Width (µS) 3.7 3.6 3.5 3.4 3.3 3.2 -25 0 25 Temperature (°C) 50 75 100
Burst/Back Porch Width vs Temperature
5.5V 5V 4.5V
3.1 -50
-25
0
25 Temperature (°C)
50
75
100
5
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