AD9806KST Analog Devices Inc, AD9806KST Datasheet - Page 11

• 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

APPLICATION INFORMATION
Grounding and Decoupling Recommendations
As shown in Figure 10, a single ground plane is recommended
for the AD9806. This ground plane should be as continuous as
possible, particularly around Pins 25 through 37. This will ensure
that all analog decoupling capacitors provide the lowest possible
impedance path between the power and bypass pins and their
respective ground pins. All decoupling capacitors should be
located as close as possible to the package pins. A single clean
power supply is recommended for the AD9806, but a separate
digital driver supply may be used for DRVDD (Pin 12). DRVDD
should always be decoupled to DRVSS (Pin 13), which should
be connected to the analog ground plane. The advantages of
using a separate digital driver supply include using a lower volt-
age (2.7 V) to match levels with a 2.7 V ASIC, reducing digital
power dissipation, and reducing potential noise coupling.
Using the AD9806 in AD9803 Sockets
The AD9806 may be easily used in existing AD9803 designs
without any circuit modifications. Most of the pin assignments
are the same for both ICs. Table I outlines the differences. The
circuit of Figure 10 shows the necessary connections for the
AD9806 when used in an existing AD9803 socket. If the two
auxiliary DACs are not used, then Pins 39 and 40 (DAC1 and
DAC2) may be grounded. If the AUX or ADC modes are needed,
then the input signal should be connected to either AUXIN or
ADCIN through a 0.1 µF capacitor, in the same way that
CCDIN is used with the input signal.
V
NC = NO CONNECT
OUTPUT
DIGITAL
DD
DATA
0.1 F
0.1 F
10
11
12
1
2
3
4
5
7
8
9
6
0.1 F
V
NC
D0 (LSB)
D1
D2
D3
D4
D5
D6
D7
D8
D9 (MSB)
DRVDD
DD
1.0 F
0.1 F
48 47 46 45 44
13 14 15 16 17 18 19 20 21 22 23 24
0.1 F
AD9806
V
DD
43 42 41 40
Pin
No.
1
15
24
25
27
28
29
30
35
38
Using the AD9806 in New Designs
Figure 11 shows the recommended circuit for using the AD9806
in new designs. Three external decoupling capacitors have been
removed from the circuit shown in Figure 9, one from Pin 29,
one from Pin 38, and one from between Pins 47 and 48. Note
that the decoupling capacitors for Pins 47 (VRB) and 48 (VRT)
must be increased to 1.0 µF when used in this configuration.
39 38 37
AD9803
NC
ACLP
NC
CCDBYP2
PIN
CCDBYP2
PGABYP1
PGABYP2
AUXCONT
VTRBYP
SDATA
SCK
SL
Table I. AD9806/AD9803 Pin Differences
0.1 F
0.1 F
CLPOUT
CLPBYP
CLPREF
AUXMID
ACVDD
ACVSS
ADCIN
AUXIN
CLPDM
SHD
SHP
CLPOB
PBLK
ADCCLK
DIN
NC
NC
NC
36
35
34
33
32
31
30
29
28
27
26
25
VOUT2
VOUT1
0.1 F
0.1 F
0.1 F
0.1 F
0.1 F
AD9806
NC
NC
NC
CLPOUT
NC
CLPREF
NC
NC
AUXMID
NC
CCD
SIGNAL
INPUT
V
0.1 F
DD
Circuit Connection
Ground
Ground
Ground
Decoupled with 0.1 µF
to Ground
Shorted to Pin 26
Decoupled with 0.1 µF
to Ground
Decoupled with 0.1 µF
to Ground
Shorted to Pin 29
Ground, or decoupled
with 0.1 µF to Ground
Decoupled with 0.1 µF
to Ground
AD9806