dBFS = 20 log(Threshold Magnitude/213) similarly, " />
參數(shù)資料
型號: AD9640ABCPZ-105
廠商: Analog Devices Inc
文件頁數(shù): 28/52頁
文件大?。?/td> 0K
描述: IC ADC 14BIT 105MSPS 64LFCSP
設(shè)計(jì)資源: Interfacing ADL5534 to AD9640 High Speed ADC (CN0049)
標(biāo)準(zhǔn)包裝: 1
位數(shù): 14
采樣率(每秒): 105M
數(shù)據(jù)接口: 串行,SPI?
轉(zhuǎn)換器數(shù)目: 2
功率耗散(最大): 657mW
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 64-LFCSP-VQ(9x9)
包裝: 托盤
輸入數(shù)目和類型: 4 個(gè)單端,單極;2 個(gè)差分,單極
AD9640
Rev. B | Page 34 of 52
dBFS = 20 log(Threshold Magnitude/213)
similarly, corresponds to the fine lower threshold bits, except
that it is asserted only if the input magnitude is less than the
value programmed in the fine lower threshold register after the
dwell time elapses. The dwell time is set by the 16-bit dwell time
value located at Address 0x10A and Address 0x10B and is set in
units of ADC input clock cycles ranging from 1 to 65,535. The
fine lower threshold register is a 13-bit register that is compared
with the magnitude at the output of the ADC. This comparison
is subject to the ADC clock latency but allows a finer, more
accurate comparison. The fine upper threshold magnitude is
defined by the following equation:
The decrement gain output works from the ADC fast detect
output pins, providing a fast indication of potential overrange
conditions. The increment gain uses the comparison at the
output of the ADC, requiring the input magnitude to remain
below an accurate, programmable level for a predefined period
before signaling external circuitry to increase the gain.
The operation of the increment gain output and the decrement
gain output is shown in Figure 67.
0
65
47
-0
97
F_UT
F_LT
FINE UPPER THRESHOLD
FINE LOWER THRESHOLD
Figure 67. Threshold Settings for F_UT and F_LT
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