參數資料
型號: AD9846AJSTZ
廠商: Analog Devices Inc
文件頁數: 22/24頁
文件大?。?/td> 0K
描述: IC CCD SIGNAL PROC 10BIT 48LQFP
標準包裝: 1
類型: CCD 信號處理器,10 位
輸入類型: 邏輯
輸出類型: 邏輯
接口: 3 線串口
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP
供應商設備封裝: 48-LQFP(7x7)
包裝: 托盤
REV. 0
AD9846A
–7–
DEFINITIONS OF SPECIFICATIONS
DIFFERENTIAL NONLINEARITY (DNL)
An ideal ADC exhibits code transitions that are exactly 1 LSB
apart. DNL is the deviation from this ideal value. Thus every code
must have a nite width. No missing codes guaranteed to 10-bit
resolution indicates that all 1024 codes, respectively, must be
present over all operating conditions.
PEAK NONLINEARITY
Peak nonlinearity, a full signal chain specication, refers to the
peak deviation of the output of the AD9846A from a true straight
line. The point used as “zero scale” occurs 1/2 LSB before the
rst code transition. “Positive full scale” is dened as a Level 1,
1/2 LSB beyond the last code transition. The deviation is measured
from the middle of each particular output code to the true straight
line. The error is then expressed as a percentage of the 2 V ADC
full-scale signal. The input signal is always appropriately gained up
to ll the ADC’s full-scale range.
TOTAL OUTPUT NOISE
The rms output noise is measured using histogram techniques.
The standard deviation of the ADC output codes is calculated
in LSB, and represents the rms noise level of the total signal
chain at the specied gain setting. The output noise can be
converted to an equivalent voltage, using the relationship 1 LSB
= (ADC Full Scale/2
N codes) when N is the bit resolution of the
ADC. For the AD9846A, 1 LSB is 2 mV.
POWER SUPPLY REJECTION (PSR)
The PSR is measured with a step change applied to the supply
pins. This represents a very high frequency disturbance on the
AD9846A’s power supply. The PSR specication is calculated
from the change in the data outputs for a given step change in
the supply voltage.
INTERNAL DELAY FOR SHP/SHD
The internal delay (also called aperture delay) is the time delay
that occurs from when a sampling edge is applied to the AD9846A
until the actual sample of the input signal is held. Both SHP and
SHD sample the input signal during the transition from low to
high, so the internal delay is measured from each clock’s rising
edge to the instant the actual internal sample is taken.
EQUIVALENT INPUT CIRCUITS
330
DVDD
DVSS
Figure 1. Digital Inputs—SHP, SHD, DATACLK, CLPOB,
CLPDM, HD, VD, PBLK, SCK, SL
DVDD
DVSS
DRVSS
DRVDD
THREE-
STATE
DATA
DOUT
Figure 2. Data Outputs—D0–D9
AVDD1
AVSS
Figure 3. CCDIN (Pin 30)
330
DVDD
DVSS
DVDD
DVSS
DATA IN
RNW
DATA OUT
Figure 4. SDATA (Pin 47)
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