![](http://datasheet.mmic.net.cn/370000/IR3Y48_datasheet_16697449/IR3Y48_23.png)
NOTES :
1. Normally : Signal path through CDS
/
AGC
/
ADC
In this case analog input range is downward
from clamp voltage.
ADIN
: Signal bypassing CDS (Direct AGC or ADC
input)
In this case analog input range is upward
from clamp voltage.
2. Specified at MONOUT pin. The noise bandwidth is 100
kHz to 5 MHz.
3. Bandwidth from CCDIN/REFIN to ADC. The bandwidth
is specified as the settling time of ADC output for step
input (full scale – 1 dB) response (at gain = min.).
4. Black calibration period is the period of stabilization of
output code within ±1 LSB (average) compared to register
value for the black level code of 0 to 50% of the full scale
input. (Assuming external capacitance = 0.033 μF.)
External capacitor value to OBCAP pin determines the
bandwidth of the black level cancel loop. Since the gain
of the loop depends on sampling frequency, the
maximum frequency (settling within certain pixels) and
the minimum frequency (avoiding oscillation of the circuit)
are defined.
5. Select the external capacitor referring the following list
based on the minimum and maximum operating
frequencies.
If the black level settling specification (within 2 000
pixels) could be ignored, the maximum sampling
frequency for 0.1 μF and 0.33 μF will extend according
to the increment.
IR3Y48M
23
Analog Specifications
(Unless otherwise specified, AV
DD
= DV
DD
= 3.0 V, T
A
= +25 C, signal frequency f
IN
= 1 MHz,
signal level = –1 dB (full scale))
The current direction flowing into the pin is positive direction.
CDS & CLAMP CIRCUITS
PARAMETER
(Sampling frequency f
S
= 20 MHz)
TYP.
MIN.
MAX.
1.1
1.1
SYMBOL
V
ICDS
V
IAI
CONDITIONS
Normally
At ADIN
UNIT
Vp-p
Vp-p
NOTE
Analog input range
100
400
15
μV
rms
μV
rms
pF
pixel
V
V
pixel
1
At fs = 20 MHz
NI
Input referred noise
At gain = max.
At gain = min.
Input capacitance
Input Bandwidth
C
IN
CBW
CCDIN, ADIN & REFIN
1
3
2
Clamp voltage
1.95
1.45
1.8
1.3
1.65
1.15
Normally
At ADIN
V
CLPCAP
Black calibration period
4, 5
2000
t
BKCAL
PARAMETER
MODE
20 MHz
mode
OBCAP
MAX.
MIN.
Available
sampling
frequency
7.6
20
0.033 μF
MHz
UNIT
MHz
0.33 μF
1.7
0.6
MHz
0.1 μF
5.7
2.2
MHz
0.033 μF
15
5.8
15 MHz
mode