AD9806KST Analog Devices Inc, AD9806KST Datasheet - Page 8

• Manufacturer Part Number: AD9806KST
• Description: IC CCD SIGNAL PROC 10BIT 48-LQFP
• Manufacturer: Analog Devices Inc
• Type: CCD Signal Processor, 10-Bitr

Specifications of AD9806KST

• Rohs Status: RoHS non-compliant
• Input Type: Logic
• Output Type: Logic
• Interface: 3-Wire Serial
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Analog Front End Type: CCD
• Analog Front End Category: Video
• Interface Type: Serial (3-Wire)
• Input Voltage Range: 0.5V
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Resolution: 10b
• Number Of Adc's: 1
• Power Supply Type: Analog/Digital
• Operating Temp Range: -20C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 48
• Package Type: LQFP
• Number Of Channels: 1
• Current - Supply: -
• Lead Free Status / RoHS Status: Not Compliant

AD9806
TIMING SPECIFICATIONS (Continued)
NOTE: The AD9806 uses an “automatic” video clamp that senses the most negative in the input signal and uses this level to set the clamp voltage.
As shown in the video waveform above, the SYNC level will be clamped to the black level specified in the E-Register.
PGA GAIN CURVE DETAILS
In CCD-Mode, the AD9806 PGA stage provides a gain range
of 0 dB to 34 dB, programmable with 10-bit resolution through
the serial digital interface. The PGA gain curve is divided into
two separate regions. When the PGA Gain Register code is
between 0, and 511, the curve follows a (1 + x)/(1 – x) shape,
which is similar to a “linear-in-dB” characteristic. From Code
Code Range Gain Equation (dB)
0–511
512–1023
(AD9806 INTERNAL
CLAMP INTERVAL
34
28
22
16
10
–2
4
0
0.8V
SIGNAL)
127
SIGNAL
CCD-MODE
Gain = 20 log
Gain = (0.0354)(code) – 2.4
INPUT SIGNAL
VIDEO
INPUT
255
PGA GAIN REGISTER CODE
0.4V
383
10
([658 + code]/[658 – code]) – 2.4
511
??V
0.1 F
639
AUXMID
PIN 35
OCCURS DURING SYNC
INTERNAL CLAMPING
767
SYNC
0.4V
H
0.4V
895
5k
1023
–4 dB TO +14dB
REGISTER
PGA GAIN
PGA
512 to Code 1023, the curve follows a “linear-in-dB” shape. In
AUXMID-Mode, the PGA provides a gain range of –4 dB to
+14 dB, programmable with 9-bit resolution. The exact PGA
gain for either mode can be calculated for any Gain Register
value by using the following equations:
Code Range Gain Equation (dB)
512–1023
9
14
–4
11
–1
8
5
2
512
ADC
AUXMID-MODE
Gain = 20 log
639
PGA GAIN REGISTER CODE
10
([146 + code]/[1170 – code]) – 4
767
MIDSCALE
895
1023