3.7.1. Typical spectral range and quantum efficiency (QE)

The following diagrams show the quantum efficiency as a function of wavelength. The curve is a measurement where the chip has a wide-

range anti-reflection coating which is optimized at 650 nm.

Figure 6: Quantum efficiency as a function of wavelength

3.8. Frequency response

The signal amplitude at the output of the video amplifier is a function of the optical modulation and the read-out clock frequency. The

optical modulation is defined as follows:

Shadow

epc901

side view

Light source (parallel light)

Light

Grid

Pixel 0

Pixel 1023

Pixel no.

0

1023

Amplifier

output

Test setup

Measurement output

0.128mm

0.128mm

The amplitude at the video amplifier output as a function of the Read Clock frequency is as follows (temperature sensor off, differential

mode):

Read Clock

frequency

Mode

BW (video am-

plifier band-

width setting)

VIDEO_

GBW_SEL_

REG

GAIN

Min. useful

signal swing

SNR typ.

(charge pump off)

SNR typ.

(charge pump on)

Useful

pixel

min

typ

min

typ

1MHz

Differential

LOW_BW

0x0

1

2.0Vpp

66dB

70dB

65dB

67dB

3..1020

10MHz

Differential

HIGH_BW

0x3

1

1.5Vpp

55dB

58dB

53dB

55dB

3..1020

54MHz

Differential

HIGH_BW

0x3

1

0.5Vpp

46dB

49dB

44dB

46dB

3..1020

54MHz

Differential

HIGH_BW

0x3

2

0.75Vpp

46dB

49dB

42dB

46dB

3..1020

54MHz

Differential

HIGH_BW

0x3

4

1.25Vpp

46dB

49dB

42dB

46dB

3..1020

1MHz

Single-ended

LOW_BW

0x0

1

1.6Vpp

67dB

70dB

N/A

N/A

3..1020

Table 2: Useful video amplifier signal swing and SNR for different settings

Note:

1

For the ROI_SEL=H, the read-out region as defined in Table 5 is the useful pixel range

© 2016 ESPROS Photonics Corporation

Characteristics subject to change without notice

10 / 37

Datasheet_epc901-V5.6

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Wavelength [nm]