EL6261C Product
EL6261C Product Brief
Quad 20MHz & Quad, 80MHz, Switched Gain Pre-Amp
Features
•
Autozero of output offset to
<10mV
•
3 selectable gains; 8KΩ, 15KΩ,
40KΩ
•
Space saving QSOP-24 package
•
Differential Sum & Sum-Bar
outputs
•
Single 5V supply
General Description
The EL6261C consists of 4 20MHz trans-impedance amplifiers and 4
80MHz trans-impedance amplifiers. The four 80Mhz amplifier out-
puts also are averaged to provide differential 80MHz outputs.
The EL6261C is designed to amplify the photo diode currents for CD,
DVD, or other photo diode pick-up applications.
Two TTL/CMOS compatible inputs select the gain for all eight ampli-
fiers. The gain settings are 8KΩ, 15KΩ and 40KΩ for all channels.
The sum and sumbar outputs are 11KΩ, 20KΩ and 53KΩ single
ended. Gain matching is typically 3%, channel to channel. An auto-
zero input brought high after power up reduces the output offsets to
less than 10mV.
The E,F,G,H channel bandwidths are 20MHz for all gains and reason-
able input and output loads. The A,B,C,D,S,S channels have
bandwiths of 80MHz, 45MHz, and 25MHz at low, middle, and high
gains respectively.
Each amplifier output can sink or source up to 5mA, and their outputs
can swing 1Vp-p at full bandwidth.
The EL6261C operates from a single +5V supply, and is available in
QSOP-24 package. It is specified for operation from -0°C to 70°C
Applications
•
•
•
•
•
•
DVD RAM, R/W and ROM
CD R/W, R and ROM
MO drives
Optical Pickup pre-amplifier
Servo positioning systems
High speed instrumentation
Ordering Information
Part No
EL6261CU
Temp. Range
0°C to +70°C
Package
QSOP-24
Outline #
MDP0040
Connection Diagram
Gain 0 Select
Gain 1 Select
Ref Input
A Input
B Input
C Input
D Input
0V (V
SS
)
E Input
F Input
G Input
H Input
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
AZ Input
Sum Output
Sum Output
A Output
B Output
C Output
D Output
+5V (V
DD
)
E Output
F Output
G Output
H Output
24-Pin QSOP
December 3, 1999
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.
© 1998 Elantec, Inc.
ELANTEC [ ELANTEC SEMICONDUCTOR ]
