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Part: EL6204
Category:
Description: Laser Diode Driver, Resistor Controlled 60/600MHz Osc, 10/100mA Ouput, 1.1V Low Drop-out
Company: Intersil Corporation
Datasheet: Download EL6204 datasheet File size : 427 kB
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Datasheet text preview:
®
EL6204
D a ta Sheet N ov em be r 15, 2002 FN7219
Laser Driver Oscillator
The EL6204 is a push-pull oscillator used to reduce laser noise. It uses the standard interface to existing ROM controllers. The frequency and amplitude are each set with a separate resistor connected to ground. The tiny package and harmonic reduction allow the part to be placed close to a laser with low RF emissions. An auto turn-off feature allows it to easily be used on combo CD-RW plus DVD-ROM pickups. If the APC current is reduced such that the average laser voltage drops to less than 1.1V, the output and oscillator are disabled, reducing power consumption to a minimum. The current drawn by the oscillator consists of a small utility current, plus the peak output amplitude in the positive cycle. In the negative cycle the oscillator subtracts peak output amplitude from the laser APC current. The EL6204 part is available in the space-saving 6-pin SOT23 package and is specified for operation from 0°C to +70°C.
Features
· Low power dissipation · User-selectable frequency from 60MHz to 600MHz controlled with a single resistor · User-specified amplitude from 10mAPK-PK to 100mAPK-PK controlled with a single resistor · Auto turn-off threshold · Soft edges for reduced EMI · Small 6-pin SOT-23 package
Applications
· DVD players · DVD-ROM drives · CD-RW drives · MO drives · General purpose laser noise reduction · Local oscillators
Pinout
EL6204 (6-PIN SOT-23) TOP VIEW
Ordering Information
PART NUMBER PA CKAGE 6-Pin SOT-23* TAPE & REEL PKG. NO. M DP0038
1
IOUT
RFREQ
6
EL620 4CW
2
VDD
GND2
5
*EL6204CW symbol is .Txxx where xxx represents date code
3 GND1 RAMP 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.
EL6204
Absolute Maximum Ratings (TA = 25°C)
Voltages Applied to: VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.0V IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.0V RFREQ, RAMP . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.0V Operating Ambient Temperature Range . . . . . . . . . . . 0°C to +70°C Maximum Junction 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), RAMP =
2540 (IOUT = 50mAP-P measured at 60MHz), VOUT = 2.2V PARAMETER PSOR ISO ISTYP IS L O IS H I VFREQ VRAMP VCUTOFF D E S C R IP T I O N Power Supply Operating Range Supply Current Disabled Supply Current Typical Conditions Supply Current Low Conditions Supply Current High Conditions Voltage at RFREQ Pin Voltage on RAMP Pin Monitoring Voltage of IOUT Pin 1.1 VOUT < VCUTOFF RFREQ = 5.21k, RAMP = 2.54k RFREQ = 30.5k, RAMP = 12.7k RFREQ = 3.05k, RAMP = 1.27k CONDITIONS M IN 4 .5 5 50 18.5 4.75 32 1.27 1.27 1.4 TYP M AX 5.5 7 50 22 UN IT V µA mA mA mA V V V
Oscillator Characteristics
PARAMET ER FOSC FHIGH FLOW TCOSC PSRROSC
VDD = +5V, TA = 25°C, RL = 10, RFREQ = 5210 (FOSC = 350MHz), RAMP = 2540 (IOUT = 50mAP-P measured at 60MHz), VOUT = 2.2V CONDITIONS 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 MA X 400 UN IT MHz MHz MHz ppm/°C %
DESCRIPTION Frequency Tolerance Frequency Range High Frequency Range Low Frequency Temperature Sensitivity Frequency Change F/F
Driver Characteristics
PARAMETER AMPHIGH AMPLOW IOSNOM IOSHIGH IOSLOW IOUTP-P Duty Cycle PSRRAMP TON TOFF IOUTN
VDD = +5V, TA = 25°C, RL = 10, RFREQ = 30.5k (FOSC = 60MHz), RAMP = 2540 (IOUT = 50mAP-P measured at 60MHz), VOUT = 2.2V C O N D IT I O N S RAMP = 1.27k RAMP = 12.7k RFREQ = 5210, VOUT = 2.2V RFREQ = 5210, VOUT = 2.8V RFREQ = 5210, VOUT = 1.8V Defined as one standard deviation RFREQ = 5210 VDD from 4.5V to 5.5V Output voltage step from 0V to 2.2V Output voltage step from 2.2V to 0V RFREQ = 5210, measured @ 10MHz M IN T YP 100 10 -4 -4.8 -3.5 2 43 -54 15 0 .5 2 .5 M AX UNIT mAP-P mAP-P mA mA mA % % dB µs µs nA/Hz
DESCRIPT ION Amplitude Range High Amplitude Range Low Offset Current @ 2.2V Offset Current @ 2.8V Offset Current @ 1.8V Output Current Tolerance Output Push Time/Cycle Time Amplitude Change of Output I/I Auto Turn-on Time Auto Turn-off Time Output Current Noise Density
2
EL6204 Pin Descriptions
PIN NAME 1 2 3 4 5 6 PIN TYPE IO U T VDD GND1 RAMP GND2 RFREQ Current output to laser diode Positive power for laser driver (4.5V - 5.5V) Chip ground pin (0V for output) Set pin for output current amplitude Chip ground pin (0V for RFREQ, RAMP) Set pin for oscillator frequency PIN DESCRIPTION
Recommended Operating Conditions
VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ±10% VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2V - 3V RFREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3k (min) RAMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25k (min) FOSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60-600MHz IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-100mAPK-PK
IOUT Control
VOUT Less than VCUTOFF More than VCUTOFF IOUT OFF Normal Operation
3
EL6204 Typical Performance Curves
VDD = 5V, TA = 25°C, RL = 10, RFREQ = 5.21k, RAMP = 2.54k, 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 18 30 42 54 66 78 90 0.35 0.8 0 .9 6 Measured from -40°C to +85°C Frequency Drift with Temperature
400
200
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
RFREQ (k)
1k / RFREQ
Output Current vs RAMP 180 160 140 Output Current (mA) 120 100 80 (over-shoot not included) 60 40 20 0 0 2 4 6 8 10 12 14 Amplitude PK-PK=127 * 1k / RAMP (mA) measured @60MHz IOUT PK-PK measured @60/350/600MHz (over-shoot included) Output Current (mA) 180 160 140 120 100 80 60 40 20
Output Current vs 1 / RAMP
IOUT PK-PK measured @60/350/600MHz (over-shoot included)
Amplitude PK-PK= 127 * 1k / RAMP (mA) measured @60MHz (over-shoot not included)
0 0 0.1 0.2 0.3 0 .4 0 .5 0 .6 0.7 1k / RAMP
RAMP (k)
4
EL6204 Typical Performance Curves
Supply Current vs RFREQ 25 35
(Continued)
Supply Current vs RAMP
30 Supply Current (mA) Supply Current (mA)
20
25
20
15
15
10
0 0 5 10 15 20 25 30 35
0 0 5 10 15 20 25 30 35
RFREQ (k)
RAMP (k)
Frequency vs Supply Voltage 360 100
Peak-to-Peak Output Current vs Supply Voltage
355 Frequency (MHz) IOUT PK-PK (mA) 4.6 4.8 5 5.2 5.4 5.6
95
350
90
345
85
340 4.4
80 4.4
4.6
4.8
5
5.2
5 .4
5 .6
Supply Voltage (V)
Supply Voltage (V)
Supply Current vs Supply Voltage 21 400
Frequency vs Temperature
380 20 Supply Current (mA) Frequency (MHz) 4.6 4.8 5 5.2 5.4 5.6 360
19
340
18 320
17 4.4
300 -50
0
50 Ambient Temperature (°C)
100
150
Supply Voltage (V)
5
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