EPC901 Datasheet, PDF (27/37 Pages) Espros Photonics corp – CCD line sensor 1024x1 pixel

11. Application information
Referring to Figure 13 and Figure 14, please note the following:
■ The different GND pins can be connected together, preferably to a plane / star connection. Refer also to section 13.3.1.
■ The video amplifier has separate supply pins VDD_OA and GND_OA due to its fast switching currents. It is important to block this power
supply pins with low ESR capacitors as close as possible at the chip in order to avoid noise at the video output due to supply voltage
bouncing.
■ The voltage level applied to VDD_OA must be the same as on pin VDD. Otherwise the IC can be damaged due to latch-up.
■ If the pin VIDEO_CM is left open (not connected), the video amplifier operates in differential mode. If this pin is tied to ground, together
with the pin VIDEO_N, the video amplifier operates in single ended mode.
Video amplifier operation mode
Differential
Single ended
VIDEO_P
Positive output
Output
VIDEO_N
Negative output
GND
VIDEO_CM
(not connected)
GND
11.1. Circuit for differential mode
VDD
Factory
L
(do not
connect)
C_VDD
Configuration
32
C_VDD1V8
18
C_VDD5V0
20
C_VDD7V0
VDD1V8
VDD5V0
VDD7V0
epc901
CCD --> Frame Store Buffers --> CDS
Communication
μC / FPGA
Video
Amp
VDD
VDD_OA 10
C_{VDD_OA}
VIDEO_P 9
VIDEO_CM
VIDEO_N
11_NC
8
ADC
R_BIAS
Figure 13: Differential mode application diagram
Please note that pin 11 can be left open in this operating mode. The IC sets this pin to VDD/2 which is the offset voltage of the VIDEO_P
and VIDEO_N signal. However, it is possible to apply a voltage source at VIDEO_CM to control the common mode voltage of the output
signal. Make sure that this is a low noise/low ripple source and add a 1µF low ESR blocking capacitor as close as possible to pin 11. In ad -
dition to that, the voltage at VIDEO_CM must be as defined in the table under section 3.3.Electrical characteristics V .
CM_D
Illumination
VIDEO_N
VIDEO_P
VIDEO_P – VIDEO_N (typ.)
Dark voltage
VVIDEO_CM + 0.4V
VVIDEO_CM – 0.4V
-0.8V
Maximum video output
VVIDEO_CM – 0.6V
VVIDEO_CM + 0.6V
1.2
Table 28: Video amplifier output in differential mode
© 2016 ESPROS Photonics Corporation
Characteristics subject to change without notice
27 / 37
Datasheet_epc901-V5.6
www.espros.com