TC237B

680-

× 500-PIXEL CCD IMAGE SENSOR

SOCS063 – APRIL 2001

11

POST OFFICE BOX 655303

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted)

PARAMETER

MIN

TYP†

MAX

UNIT

Dynamic range (see Note 2)

With CDS‡§

64

dB

Dynamic range (see Note 2)

Without CDS‡§

58

59

dB

Charge conversion factor

13

µV/e

Charge transfer efficiency (see Note 3)

0.9999

0.99995

1

Signal response delay time,

τ (see Note 4)

12.5

ns

Gamma (see Note 5)

1

Output resistance

300

400

500

Ω

Amplifier noise equivalent signal

With CDS‡

15

18

21

electrons

Amplifier noise equivalent signal

Without CDS‡

30

36

42

electrons

ADB (see Note 6)

20

Rejection ratio

SRG (see Note 7)

45

dB

Rejection ratio

ODB (see Note 8)

25

dB

Supply current

5

10

mA

IAG1, IAG2

2000

Input capacitance C

SRG

70

pF

Input capacitance, Ci

RST

10

pF

SAG

4000

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

‡ CDS = Correlated double sampling, a signal-processing technique that improves noise performance by subtraction of reset noise.

§ Performance depends on the particular implementation of the CDS technique and on the selected filter bandwidth that precedes sampling.

NOTES:

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

3. 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.

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

5. Gamma (

γ) is the value of the exponent in 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)

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

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

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