AD9803
TIMING SPECIFICATIONS
CCD
N
N+1
N+2
N+3
N+4
SHP
t
ID
t
INHIBIT
SHD
t
ID
ADCCLK
t
OD
t
HOLD
ADCCLK RISING EDGE PLACEMENT
D0–D9
N–8
N–7
N–6
N–5
N–4
N–3
NOTES:
1. SHP AND SHD SHOULD BE OPTIMALLY ALIGNED WITH THE CCD SIGNAL. SAMPLES ARE TAKEN AT THE
RISING
EDGES.
2. ADCCLK RISING EDGE MUST OCCUR AT LEAST 15ns AFTER THE RISING EDGE OF SHP (
t
INHIBIT
).
3. RECOMMENDED PLACEMENT FOR ADCCLK RISING EDGE IS BETWEEN THE RISING EDGE OF SHD AND FALLING EDGE OF SHP.
4. OUTPUT LATENCY (7 CYCLES) SHOWN WITH EVEN-ODD OFFSET CORRECTION ENABLED.
5. ACTIVE LOW CLOCK PULSE MODE IS SHOWN.
Figure 1. CCD-MODE Timing
N
VIDEO
INPUT
N+1
N+2
N+3
N+4
N+5
t
OD
ADCCLK
t
ID
t
HOLD
D0–D9
N–4
N–3
N–2
N–1
N
NOTE:
EXAMPLE OF OUTPUT DATA LATCHED BY ADCCLK RISING EDGE.
Figure 2. AUX-MODE and ADC-MODE Timing
EFFECTIVE
PIXELS
CCD
SIGNAL
OPTICAL BLACK
BLANKING
INTERVAL
DUMMY BLACK
EFFECTIVE
PIXELS
CLPOB
CLPDM
PBLK
NOTES:
1. CLPOB PULSEWIDTH SHOULD BE A MINIMUM OF 10 OB PIXELS WIDE, 20 OB PIXELS ARE RECOMMENDED.
2. CLPDM PULSEWIDTH SHOULD BE AT LEAST 1 s WIDE.
3. PBLK IS NOT REQUIRED, BUT RECOMMENDED IF THE CCD SIGNAL AMPLITUDE EXCEEDS 1V p-p.
4. CLPDM OVERWRITES PBLK.
5. ACTIVE LOW CLAMP PULSE MODE IS SHOWN.
Figure 3. CCD-MODE Clamp Timing
REV. 0
–5–
AD [ ANALOG DEVICES ]
