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

VIDEO_P

VIDEO_N

VIDEO_CM

Differential

Positive output

Negative output

(not connected)

Single ended

Output

GND

GND

11.1. Circuit for differential mode

epc901

R

BIAS

VDD1V8

VDD7V0

VDD_OA

VIDEO_P

VIDEO_N

C

VDD7V0

C

VDD1V8

VDD

VDD

C

VDD

Communication

μC / FPGA

ADC

Configuration

Factory

(do not

connect)

32

20

8

10

CCD --> Frame Store Buffers --> CDS

NC

9

VDD5V0

C

VDD5V0

18

VIDEO_CM

11

Video

Amp

C

VDD_OA

L

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

Illumination

VIDEO_N

VIDEO_P

VIDEO_P – VIDEO_N (typ.)

Dark voltage

-0.8V

Maximum video output

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