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AD9845BJSTZRL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
REV. B –3–
AD9845B
Parameter Min Typ Max Unit Notes
P
OWER CONSUMPTION 153 mW See TPC 1 for Power Curves
MAXIMUM CLOCK RATE 30 MHz
CDS
Gain 0 dB
Allowable CCD Reset Transient
1
500 mV
Max Input Range before Saturation
1
1.0 V p-p PxGA Gain at 4 dB
Max CCD Black Pixel Amplitude
1
200 mV
PIXEL GAIN AMPLIFIER (PxGA)
Max Input Range 1.0 V p-p
Max Output Range 1.6 V p-p
Gain Control Resolution 64 Steps
Gain Monotonicity Guaranteed
Gain Range (Twos Complement Coding) See Figure 28 for PxGA
Gain Curve
Min Gain (PxGA Gain Code 32) –2.5 dB
Max Gain (PxGA Gain Code 31) 9.5 dB
VARIABLE GAIN AMPLIFIER (VGA)
Max Input Range 1.6 V p-p
Max Output Range 2.0 V p-p
Gain Control Resolution 1024 Steps
Gain Monotonicity Guaranteed
Gain Range See Figure 29 for VGA Gain Curve
Low Gain (VGA Gain Code 77) 2 dB
Max Gain (VGA Gain Code 1023) 36 dB
BLACK LEVEL CLAMP
Clamp Level Resolution 256 Steps
Clamp Level Measured at ADC Output
Min Clamp Level 0 LSB
Max Clamp Level 255 LSB
SYSTEM PERFORMANCE Specifications Include Entire Signal Chain
Gain Accuracy
2
Gain = (0.0353 ⫻ Code) + 3.3
Low Gain (VGA Code 77) 5.5 6 6.5 dB
Max Gain (VGA Code 1023) 38.2 39.5 40.2 dB
Peak Nonlinearity, 500 mV Input Signal 0.1 % 12 dB Gain Applied
Total Output Noise 0.5 LSB rms AC Grounded Input, 6 dB Gain Applied
Power Supply Rejection (PSR) 40 dB Measured with Step Change on Supply
POWER-UP RECOVERY TIME Normal Clock Signals Applied
Reference Standby Mode 1 ms
Total Shutdown Mode 3 ms
Power-Off Condition 15 ms
NOTES
1
Input signal characteristics defined as follows:
200mV MAX
OPTICAL BLACK PIXEL
500mV TYP
RESET TRANSIENT
1V MAX
INPUT SIGNAL RANGE
2
PxGA gain fixed at Code 63 (3.3 dB).
Specifications subject to change without notice.
CCD MODE SPECIFICATIONS
(T
MIN
to T
MAX
, AVDD = DVDD = 3.0 V, f
DATACLK
= f
SHP
= f
SHD
= 30 MHz, unless otherwise noted.)
REV. B–4–
AD9845B
AUX1 MODE SPECIFICATIONS
Parameter Min Typ Max Unit
POWER CONSUMPTION 120 mW
MAXIMUM CLOCK RATE 30 MHz
INPUT BUFFER
Gain 0dB
Max Input Range 1.0 V p-p
VGA
Max Output Range 2.0 V p-p
Gain Control Resolution 1023 Steps
Gain (Selected Using VGA Gain Register)
Min Gain 0 dB
Max Gain 36 dB
Specifications subject to change without notice.
AUX2 MODE SPECIFICATIONS
Parameter Min Typ Max Unit
POWER CONSUMPTION 120 mW
MAXIMUM CLOCK RATE 30 MHz
INPUT BUFFER (Same as AUX1 MODE)
VGA
Max Output Range 2.0 V p-p
Gain Control Resolution 512 Steps
Gain (Selected Using VGA Gain Register)
Min Gain 0 dB
Max Gain +18 dB
ACTIVE CLAMP
Clamp Level Resolution 256 Steps
Clamp Level (Measured at ADC Output)
Min Clamp Level 0 LSB
Max Clamp Level 255 LSB
Specifications subject to change without notice.
(T
MIN
to T
MAX
, AVDD = DVDD = 3.0 V, f
DATACLK
= 30 MHz, unless otherwise noted.)
(T
MIN
to T
MAX
, AVDD = DVDD = 3.0 V, f
DATACLK
= 30 MHz, unless otherwise noted.)
REV. B –5–
AD9845B
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD9845B features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
TIMING SPECIFICATIONS
Parameter Symbol Min Typ Max Unit
SAMPLE CLOCKS
DATACLK, SHP, SHD Clock Period t
CP
33 33 ns
DATACLK High/Low Pulsewidth t
ADC
13 16.7 ns
SHP Pulsewidth t
SHP
5 8.3 ns
SHD Pulsewidth t
SHD
5 8.3 ns
CLPDM Pulsewidth t
CDM
410 Pixels
CLPOB Pulsewidth
*
t
COB
220 Pixels
SHP Rising Edge to SHD Falling Edge t
S1
0 8.3 ns
SHP Rising Edge to SHD Rising Edge t
S2
15 16.7 ns
Internal Clock Delay t
ID
3.0 ns
Inhibited Clock Period t
INH
10 ns
DATA OUTPUTS
Output Delay t
OD
13 16 ns
Output Hold Time t
H
7.0 7.6 ns
Pipeline Delay 9 Cycles
SERIAL INTERFACE
Maximum SCK Frequency f
SCLK
10 MHz
SL to SCK Setup Time t
LS
10 ns
SCK to SL Hold Time t
LH
10 ns
SDATA Valid to SCK Rising Edge Setup t
DS
10 ns
SCK Falling Edge to SDATA Valid Hold t
DH
10 ns
SCK Falling Edge to SDATA Valid Read t
DV
10 ns
*
Minimum CLPOB pulsewidth is for functional operation only. Wider typical pulses are recommended to achieve low noise clamp performance.
Specifications subject to change without notice.
(C
L
= 20 pF, f
SAMP
= 30 MHz, CCD Mode Timing in Figures 5 and 6, AUX Mode Timing in Figure 7,
Serial Timing in Figures 21–24.)
ABSOLUTE MAXIMUM RATINGS
With
Respect
Parameter To Min Max Unit
AVDD1, AVDD2 AVSS –0.3 +3.9 V
DVDD1, DVDD2 DVSS –0.3 +3.9 V
DRVDD DRVSS –0.3 +3.9 V
Digital Outputs DRVSS –0.3 DRVDD + 0.3 V
SHP, SHD, DATACLK DVSS –0.3 DVDD + 0.3 V
CLPOB, CLPDM, PBLK DVSS –0.3 DVDD + 0.3 V
SCK, SL, SDATA DVSS –0.3 DVDD + 0.3 V
VRT, VRB AVSS –0.3 AVDD + 0.3 V
BYP1-3, CCDIN AVSS –0.3 AVDD + 0.3 V
Junction Temperature 150 ∞C
Lead Temperature (10 sec) 300 ∞C
ORDERING GUIDE
Temperature Package Package
Model Range Description Option
AD9845BJST –20∞C to +85∞C LQFP ST-48
THERMAL CHARACTERISTICS
Thermal Resistance
48-Lead LQFP Package
q
JA
= 56∞C/W*
*
q
JA
is measured using a 4-layer PCB.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

AD9845BJSTZRL

Mfr. #:
Buy AD9845BJSTZRL
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-Bit 30 MSPS CCD Signal Processor
Lifecycle:
New from this manufacturer.
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