TC255P

336-

× 244-PIXEL CCD IMAGE SENSOR

SOCS057 – JUNE 1996

2-9

POST OFFICE BOX 655303

electrical characteristics over recommended operating ranges of supply voltage and operating

free-air temperature (unless otherwise noted)

PARAMETER

MIN

TYP†

MAX

UNIT

Dynamic range (see Note 2)

Antiblooming disabled (see Note 3)

66

dB

Charge-conversion factor

11

12

13

µV/e

Charge-transfer efficiency (see Note 4)

0.9995

0.99999

Signal-response delay time,

τ (see Note 5)

20

ns

Gamma (see Note 6)

0.97

0.98

0.99

Output resistance

350

Ω

Noise-equivalent signal without correlated double sampling

62

electrons

Noise-equivalent signal with correlated double sampling (see Note 7)

31

electrons

ADB (see Note 8)

13

15

18

Rejection ratio

SRG (see Note 9)

50

dB

ABG (see Note 10)

40

Supply current

5

10

mA

IAG1, IAG2

1000

Input capacitance Ci

SRG

22

pF

Input capacitance, Ci

ABG

850

pF

SAG

2000

† All typical values are at TA = 25°C.

NOTES:

2. Dynamic range is – 20 times the logarithm of the mean-noise signal divided by saturation-output signal.

3. For this test, the antiblooming gate must be biased at the intermediate level.

4. Charge-transfer efficiency is one minus the charge loss per transfer in the output register. The test is performed in the dark using

an electrical-input signal.

5. Signal-response delay time is the time between the falling edge of the SRG pulse and the output-signal valid state.

6. Gamma (

γ) is the value of the exponent is the equation below for two points on the linear portion of the transfer-function curve (this

value represents points near saturation).

Exposure (2)

Exposure (1)

g

+

Output signal (2)

Output signal (1)

7. A three-level serial-gate clock is necessary to implement correlated double sampling.

8. ADB rejection ratio is – 20 times the logarithm of the ac amplitude at the output divided by the ac amplitude at ADB (see Figure 11

for measured ADB rejection ratio as a function of frequency).

9. SRG rejection ratio is – 20 times the logarithm of the ac amplitude at the output divided by the ac amplitude at SRG.

10. ABG rejection ratio is – 20 times the logarithm of the ac amplitude at the output divided by the ac amplitude at ABG.