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參數(shù)資料
| 型號(hào)： | AD9600ABCPZ-150 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 26/72頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 10BIT 150MSPS 64LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 10 |
| 采樣率（每秒）： | 150M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 890mW |
| 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 |
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AD9600
Rev. B | Page 32 of 72
Increment Gain (IG) and Decrement Gain (DG)
The increment gain and decrement gain indicators are intended
to be used together to provide information to enable external gain
control. The decrement gain indicator works in conjunction with
the coarse upper threshold bits, asserting when the input
magnitude is greater than the 3-bit value in the coarse upper
threshold register (Address 0x105). The increment gain indicator,
similarly, corresponds with 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. This dwell time is set by the 16-bit increase
gain dwell time register (Address 0x10A and Address 0x10B) and
is 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 threshold magnitude is defined
in Equation 1 (see the Fine Upper Threshold (F_UT) section).
The decrement gain output is influenced by the fast detect output
pins, which provide a fast indication of potential overrange
conditions. Assertion of the increment gain indicator is based
on 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 IG and DG indicators is shown in Figure 66.
0
69
09
-09
7
UPPER THRESHOLD (COARSE OR FINE)
FINE LOWER THRESHOLD
IG
DG
F_LT
C_UT OR F_UT*
DWELL TIME
TIMER RESET BY
RISE ABOVE F_LT
TIMER COMPLETES BEFORE
SIGNAL RISES ABOVE F_LT
NOTE: OUTPUTS FOLLOW THE INSTANTANEOUS SIGNAL LEVEL AND NOT THE ENVELOPE BUT ARE GUARANTEED ACTIVE FOR A MINIMUM OF TWO ADC CLOCK CYCLES.
*C_UT AND F_UT DIFFER ONLY IN ACCURACY AND LATENCY.
DWELL TIME
Figure 66. Threshold Settings for C_UT, F_UT, F_LT, IG, and DG
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