sp8056eg Exar Corporation, sp8056eg Datasheet - Page 2

• Manufacturer Part Number: sp8056eg
• Description: High Speed 10-channel Photo Detector Ic
• Manufacturer: Exar Corporation

Note: DC - Don't Care, Z - High impedance
PIN ASSIGNMENTS
BOARD LAYOUT AND GROUNDING
To obtain the best performance from the SP8056, a printed circuit board with ground plane is
required. High quality, low series resistance ceramic 0.1uF bypass capacitors should be used at
the Vcc and Vs pins (pins 1 and 16). These capacitors must be located as close to the pins as
possible. The traces connecting the pins and the bypassing capacitors must be kept short and
should be made as wide as possible.
Rev 1 (9-17-03): SP8056 – High Speed 10 Channel PDIC
SIPEX RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-978-667-8700.
SIPEX CONFIDENTIAL, PRELIMINARY & PROPRIETARY. DO NOT DISTRIBUTE
OR COPY
GAIN MODE SELECTION
Sleep mode (output=High-Z)
Pin #
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
RW-write(speed 1)
RW-write(speed 2)
RW-write(speed 3)
RW-write(speed 4)
Adjustment mode
R-write(speed 1)
R-write(speed 2)
R-write(speed 3)
R-write(speed 4)
Gain Mode
RW-read
R-read
Vs
Gain 2
Gain 1
Gain 3
EF
SAD
GH
SBC
GND
A
D
B
C
RF-
RF+
Vcc
Pin Name
Reference voltage. Bypass to GND with ceramic capacitor 0.1uF
Logic input of Gain Controller. Allows three states – low, high, and floating - Z
Logic input of Gain Controller. Allows two states – low and high
Logic input of Gain Controller. Allows three states – low, high and floating - Z
Output of EF channel (sum of E + F sensor signals). In Adjustment mode it is output
of E channel
Output of SAD channel. In Adjustment mode it is output of F channel
Output of GH channel (sum of G + H sensor signals). In Adjustment mode it is output
of G channel
Output of SBC channel. In Adjustment mode it is output of H channel
Ground pin
Output of A channel
Output of D channel
Output of B channel
Output of C channel
Output of RF- channel. RF- = - (A + B +C + D + EF + GH). In Adjustment mode RF-
= - (A + B + C + D + E + F + G + H)
Output of RF+ channel. RF+ = A + B + C + D + EF + GH. In Adjustment mode RF+ =
A + B + C + D + E + F + G + H
Supply voltage. Bypass to GND with ceramic capacitor 0.1uF
Gain Factor
128
32
16
12
32
8
6
4
3
2
1
Gain1
High
High
High
High
High
High
High
High
High
Low
Low
Low
Low
Low
Logic level
Pin Function
Gain2
High
High
High
High
Low
Low
Low
Low
Z
Z
Z
Z
Z
Z
Gain3
High
High
High
High
Low
Low
Low
Low
DC
DC
Z
Z
Z
Z
SP8056
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