TC255P Datasheet, PDF (9/18 Pages) Texas Instruments – 336- × 244-pixel ccd image sensor

TC255P
336- × 244-PIXEL CCD IMAGE SENSOR
SOCS057 – JUNE 1996
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
ABG
22
pF
850
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
ǒ Ǔ + ǒ Ǔ value represents points near saturation).
g
Exposure (2)
Output signal (2)
Exposure (1)
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.
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