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Part: EL6205CW
Category:
Description: Laser Diode Driver, Variable 60/600MHz Osc, Iin Controlled 15/100mA Output, Reduced Parts Count
Company: Intersil Corporation
Datasheet: Download EL6205CW datasheet File size : 427 kB
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Datasheet text preview:
®
EL6205
D a ta Sheet N ov em be r 15, 2002 FN7220
Laser Driver Oscillator
The EL6205 consists of a variable amplitude, push only, oscillator that also supplies the laser DC current. It is designed to easily interface to existing ROM controllers, reducing parts count, and power dissipation. The reduction of parts count and the small package allows the oscillator to be placed closer to the laser, thus reducing EMI. Also, the turn-on and turn-off edges are slew rate limited to reduce higher harmonics. The total current drawn from the power supply can be less than the laser threshold current due to the unique push-only modulation method. The average current is less than the peak oscillator current, and can be less than half of the oscillator current. The power control current supplied from the main board is reduced to less than 2mA. One external resistor sets the oscillator frequency. A current applied to the IIN terminal determines the amplitude of the oscillator and laser DC current. If the oscillator amplitude is set very low, the output and oscillator are disabled. The part is available in the space-saving 6-pin SOT-23 package. It is specified for operation from 0°C to +70°C.
Features
· Low power dissipation · Reduced parts count from the conventional solution · User-selectable frequency from 60MHz to 600MHz controlled with a single resistor · User-selectable amplitude from 15mAPK-PK to 100mAPK-PK controlled by 0.3mA to 2mA input current · Auto turn-off threshold · Soft edges for reduced EMI · Small 6-pin SOT-23 package
Applications
· DVD players · DVD-ROM drives · Combo drives · MO drives · General purpose laser noise reduction · Local oscillator capability
Pinout
EL6205 (6-PIN SOT-23) TOP VIEW
Ordering Information
PA RT NUMBER EL620 5CW PAC KAGE 6-Pin SOT-23* TAPE & REEL PKG. NO. M DP0038
1
IOUT
R FREQ
6
*EL6205CW symbol is .Vxxx where xxx represents date code
2 VDD GND2 5
3
GND1
IN
4
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL6205
Absolute Maximum Ratings (TA = 25°C)
Voltages Applied to: VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.0V IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.0V RFREQ, IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.0V Operating Ambient Temperature . . . . . . . . . . . . . . . . . 0°C to +70°C Maximum Die Operating Temperature . . . . . . . . . . . . . . . . . . +150°C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mAPK-PK Power Dissipation (max) . . . . . . . . . . . . . . . . . . . . . . . . See Curves
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Supply & Reference Voltage Characteristics VDD = +5V, TA = 25°C, RL = 10, RFREQ = 5210 (FOSC = 350MHz), IIN = 1mA
(IOUT = 50mAP-P measured at 60MHz), VOUT = 2.2V PARAMETER PSOR ISO ISTYP ISLO ISHI VFREQ RIN DESCRIPT ION Power Supply Operating Range Supply Current Disabled Supply Current Typical Conditions Supply Current Low Conditions Supply Current High Conditions Voltage at RFREQ Pin Input Impedance IIN 100µA RFREQ = 5.21k (includes laser current) RFREQ = 30.5k, IIN = 300µA (includes laser current) RFREQ = 3.05k, IIN = 2mA (includes laser current) 25 CONDITIONS M IN 4.5 5 50 32 10 53 1.27 5 00 TYP M AX 5 .5 750 38 UNIT V µA mA mA mA V
Oscillator Characteristics
PA RAMETER FOSC FHIGH FLOW TCOSC PSRROSC
VDD = +5V, TA = 25°C, RL = 10, RFREQ = 5210 (FOSC = 350MHz), IIN = 1mA (IOUT = 50mAP-P measured at 60MHz), VOUT = 2.2V C ON DITIONS Unit-unit frequency variation RFREQ = 3.05k RFREQ = 30.5k 0°C to 70°C ambient VDD from 4.5V to 5.5V M IN 300 TYP 350 600 60 50 1 M AX 400 UNIT MHz MHz MHz ppm /°C %
DESCRIPT ION Frequency Tolerance Frequency Range High Frequency Range Low Frequency Temperature Sensitivity Frequency Change F/F
Driver Characteristics
PARAMETER AMPHIGH AMPLOW IAVG IOUTP-P Duty Cycle PSRRAMP TON TOFF INOUT
VDD = +5V, TA = 25°C, RL = 10, RFREQ = 30.5k (FOSC = 60MHz), IIN = 1mA (IOUT = 50mAP-P measured at 60MHz), VOUT = 2.2V DESCRIPTION CONDITIONS IIN = 2mA IIN = 300µA RFREQ = 5210 Defined as one standard deviation RFREQ = 5210 VDD from 4.5V to 5.5V Input current step from 0mA to 1mA Input current step from 1mA to 0mA M IN T YP 100 15 20 2 43 -54 15 0 .5 2 .5 M AX UNIT mAP-P mAP-P mA % % dB us us nA/Hz
Amplitude Range High Amplitude Range Low Average Output Current @ 2.2V Output Current Tolerance Output Push Time/Cycle Time Amplitude Change of Output I/I Auto Turn-on Time Auto Turn-off Time
IOUT Current Output Noise Density RFREQ = 5490, FMEASURE = 10MHz
2
EL6205 Control Table
IIN 100µA 300µA IOUT OFF Normal Operation
Pin Descriptions
PIN NUMBER 1 2 3 4 5 6 PIN NAME IOUT V DD GND1 IN GND2 RFREQ Current output to laser diode Positive power for chip and laser driver (4.5V - 5.5V) Chip ground pin Set pin for output current amplitude Chip ground pin (0V for RFREQ) Set pin for oscillator frequency PIN DESCRIPTION
Recommended Operating Conditions
VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ±10% VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2V-3V RFREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3k (min) IIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA (max) FOSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60-600MHz IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-100mAPK-PK
3
EL6205 Typical Performance Curves
VDD = 5V, TA = 25°C, RL = 10, RFREQ = 5.21k, IIN = 1mA, VOUT = 2.2V unless otherwise specified.
Frequency Distribution 500 Typical Production Distortion 8 7 6 Number of Parts Number of Parts 300 5 4 3 2 100 1 0 310 318 326 334 342 350 358 366 374 382 390 0
Frequency Drift with Temperature
Measured from -40°C to +85°C
400
200
18
30
42
54
66
78
Frequency (MHz)
Frequency TC (ppm/°C)
Frequency vs RFREQ 700 Frequency=1824 * 1k / RFREQ (MHz) 600 500 Frequency (MHz) 400 300 200 100 0 0 5 10 15 20 25 30 35 Frequency (MHz) 600 500 400 300 200 100 0 700
Frequency vs 1 / RFREQ
Frequency=1824 * 1k / RFREQ (MHz)
0
0.05
0.1
0.15
0 .2
0.25
0.3
0.35
RFREQ (k) Amplitude vs IIN 100 Amplitude = 50 * IIN 80 Amplitude (mAPK-PK) 355 60 Frequency (MHz) 360
1k / RFREQ Frequency vs Supply Voltage
350
40
345 20
0 0 1 IIN (mA) 2
340 4.4
4.6
4.8
5
5.2
5.4
Supply Voltage (V)
4
90 5.6
6
EL6205 Typical Performance Curves
(Continued)
Frequency vs Temperature 400
380 Frequency (MHz)
360
340
320
300 -50
0
50 Ambient Temperature (°C)
100
150
Block Diagram
IOUT
1
DRIVER
OSCILLATOR
6
RFREQ
VDD
2
5
GND2
GND1
3
BANDGAP REFERENCE
AUTO SHUT-OFF
4
IN
5
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