EL6263C Datasheet, PDF (1/2 Pages) Elantec Semiconductor – Quad 20MHz & Quad 70MHz, Switched Gain Pre-Amp

EL6263C - Product Brief
Quad 20MHz & Quad 70MHz, Switched Gain Pre-Amp
Features
• Autozero of output offset to
<10mV
• 3 selectable gains
• Space-saving QSOP-24 package
• Differential Sum & Sum-Bar
outputs
• Single 5V supply
Applications
• DVD RAM, RW, and ROM
• CD RW, R and ROM
• MO drives
• Optical Pickup pre-amplifier
• Servo positioning systems
• High speed instrumentation
Ordering Information
Part No
EL6263CU
Package
24-Pin QSOP
Tape & Reel
Outline #
MDP0040
General Description
The EL6263C consists of four 30MHz trans-impedance amplifiers and
four 70MHz trans-impedance amplifiers. The four 70MHz amplifier
outputs also are averaged to provide differential 70MHz outputs.
The EL6263C is designed to amplify the photodiode currents for CD,
DVD, or other photodiode pick-up applications.
Two TTL/CMOS-compatible select the gains for all eight amplifiers.
The gain settings for the fast amplifiers are 5.4kΩ, 10.7kΩ, and
28.6kΩ. The gain settings for the slow amplifiers are 13.3kΩ, 25kΩ,
and 66.7kΩ. The gain settings for the sum and sumbar outputs are
7.6kΩ, 14.3kΩ, and 38.1kΩ measured single-ended. Gain matching is
typically 3% channel to channel. The autozero input reduces each
amplifier’s output offset to less than 10mV when it goes high. The AZ
pin is TTL/CMOS-compatible.
The E, F, G, and H channel bandwidths are 30MHz for all gains and
reasonable input and output loads. The A, B, C, D, S, and S channels
have bandwidths of 70MHz, 46MHz, and 40MHz at low, middle, and
high gains respectively after driving 25cm of flex circuit.
Each amplifier output can typically sink or source up to 5mA and their
outputs can swing 1V_P-P at full bandwidth.
The EL6263C operates from a single +5V supply and is available in
QSOP-24 package. It is specified for operation from -0°C to 70°C.
Connection Diagram
GAIN 0 SELECT 1
GAIN 1 SELECT 2
REF INPUT 3
A INPUT 4
B INPUT 5
C INPUT 6
D INPUT 7
0V (VSS) 8
E INPUT 9
F INPUT 10
G INPUT 11
H INPUT 12
24 AZ INPUT
23 SUM OUTPUT
22 SUM OUTPUT
21 A OUTPUT
20 B OUTPUT
19 C OUTPUT
18 D OUTPUT
17 +5V (VDD)
16 E OUTPUT
15 F OUTPUT
14 G OUTPUT
13 H OUTPUT
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.