IR3Y48A1 View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
'IR3Y48A1' PDF : 34 Pages View PDF
IR3Y48A1
Analog Specifications
(Unless otherwise specified, AVDD = DVDD = 3.0 V, TA = +25˚C, signal frequency fIN = 1 MHz,
signal level = full scale – 1 dB.)
The current direction flowing into the pin is positive direction.
CDS & CLAMP CIRCUITS
(Sampling frequency fS = 18 MHz)
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNIT NOTE
Analog input range
VICDS
VIAI
CCDIN input
ADIN input
1.1
Vp-p
1
1.0
Vp-p
Equivalent input noise
At max. gain
50
NI At fs = 18 MHz
At min. gain
200
µVrms
2
µVrms
Input capacitance
CIN
CCDIN, ADIN & REFIN
15
pF
Input bandwidth
CBW
1 pixel 3
Clamp voltage
VCLPCAP
CCDIN input
ADIN input
1.65 1.8 1.95 V
1.15 1.3 1.45 V
Black calibration time
tBKCAL
200 pixel 4
Maximum calibratable offset voltage VBKCAL
±200
mV 5
NOTES :
1. The signal dynamic range is below the clamp voltage at
the CCDIN input, and it is above the one at the ADIN
input. The VICDS is applied at the 0 dB gain. When the
gain is below 0 dB, VICDS is 1.25 Vp-p (TYP.).
2. Measured at the MONOUT pin. The noise bandwidth is
100 kHz to 5 MHz.
3. The bandwidth from the CCDIN/REFIN to the ADC. This
is defined as the settling time of the ADC when the full
scale – 1 dB step input is inputted and the gain is 0 dB.
4. The time that is needed to settle the average value
within ±1 LSB for the set code when the PGA gain is
changed. (The OBCAP capacitor is 0.1 µF.)
The value of the OBCAP capacitor determines the
bandwidth of the black calibration loop. The loop gain is
also affected by the operation frequency. Therefore the
maximum frequency that is needed to settle within a
limited time and the minimum frequency that is needed
to avoid the undesirable oscillation are defined
corresponding with the external capacitance. Refer to the
table below to select the capacitance.
OBCAP
MINIMUM MAXIMUM FREQUENCY (MHz)
CAPACITANCE (µF) FREQUENCY (MHz) Within 200 pixels Within 400 pixels
0.068
11
Up to 18 Up to 18
0.1
8
Up to 18 Up to 18
0.15
4
Up to 14 Up to 18
0.33
3
Up to 6 Up to 10
5. The maximum calibratable offset means the difference of
the CCDIN reference level and the set data at the OBP
period.
24
Share Link: 
