and 17b. The input (fIN
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� LTC1289CCN
寤犲晢锛� Linear Technology
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 14/28闋�(y猫)
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� IC DATA ACQ SYS 12BIT 3V 20-DIP
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 18
椤�(l猫i)鍨嬶細 鏁�(sh霉)鎿�(j霉)閲囬泦绯荤当(t菕ng)锛圖AS锛�
鍒嗚鲸鐜囷紙浣嶏級锛� 12 b
閲囨ǎ鐜囷紙姣忕锛夛細 25k
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闆诲闆绘簮锛� 闆� ±
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渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 20-PDIP
鍖呰锛� 绠′欢
21
LTC1289
1289fb
output spectrum of the LTC1289 is shown in Figures 17a
and 17b. The input (fIN) frequencies are 1kHz and 12kHz
with the sampling frequency (fS) at 25kHz. The SNR
obtained from the plot are 72.92dB and 72.23dB.
Rewriting the SNR expression it is possible to obtain the
equivalent resolution based on the SNR measurement.
This is the so-called effective number of bits (ENOB). For
the example shown in Figures 17a and 17b, N = 11.8 bits
and 11.7 bits, respectively. Figure 18 shows a plot of ENOB
as a function of input frequency. The curve shows the
A/D鈥檚 ENOB remain in the range of 11.8 to 11.7 for input
frequencies up to fS/2
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
7. LTC1289 AC Characteristics
Two commonly used figures of merit for specifying the
dynamic performance of the A/D鈥檚 in digital signal pro-
cessing applications are the Signal-to-Noise Ratio (SNR)
and the 鈥渆ffective number of bits (ENOB).鈥� SNR is defined
as the ratio of the RMS magnitude of the fundamental to
the RMS magnitude of all the nonfundamental signals up
to the Nyquist frequency (half the sampling frequency).
The theoretical maximum SNR for a sine wave input is
given by:
SNR = (6.02N + 1.76dB)
where N is the number of bits. Thus the SNR is a function
of the resolution of the A/D. For an ideal 12-bit A/D the SNR
is equal to 74dB. A Fast Fourier Transform(FFT) plot of the
Figure 17a. fIN = 1kHz, fS = 25kHz, SNR = 72.92dB
Figure 19. fIN1 = 2.6kHz, fIN2 = 3.1kHz, fS = 25kHz
Figure 17b. fIN = 12kHz, fS = 25kHz, SNR = 72.23dB
Figure 18. LTC1289 ENOB vs Input Frequency
FREQUENCY (kHz)
0
6
EFFECTIVE
NUMBER
OF
BITS
7
8
9
10
11
12
10
20
30
40
LTC1289 AIF18
50
fS = 25kHz
SNR 鈥� 1.76dB
6.02
N =
FREQUENCY (kHz)
0
鈥�60
鈥�40
0
610
LTC1289 F17a
鈥�80
鈥�100
24
812
14
鈥�120
鈥�140
鈥�20
MAGNITUDE
(dB)
FREQUENCY (kHz)
0
鈥�60
鈥�40
0
610
LTC1289 F17b
鈥�80
鈥�100
24
812
14
鈥�120
鈥�140
鈥�20
MAGNITUDE
(dB)
FREQUENCY (kHz)
0
鈥�60
鈥�40
0
610
LTC1289 F19
鈥�80
鈥�100
24
812
14
鈥�120
鈥�140
鈥�20
MAGNITUDE
(dB)
鐩搁棞(gu膩n)PDF璩囨枡
PDF鎻忚堪
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鐩搁棞(gu膩n)浠ｇ悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉)
鍙冩暩(sh霉)鎻忚堪
LTC1289CCN#PBF 鍔熻兘鎻忚堪:IC DATA ACQ SYS 12BIT 3V 20-DIP RoHS:鏄� 椤�(l猫i)鍒�:闆嗘垚闆昏矾 (IC) >> 鏁�(sh霉)鎿�(j霉)閲囬泦 - ADCs/DAC - 灏�(zhu膩n)鐢ㄥ瀷 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:50 绯诲垪:- 椤�(l猫i)鍨�:鏁�(sh霉)鎿�(j霉)閲囬泦绯荤当(t菕ng)锛圖AS锛� 鍒嗚鲸鐜囷紙浣嶏級:16 b 閲囨ǎ鐜囷紙姣忕锛�:21.94k 鏁�(sh霉)鎿�(j霉)鎺ュ彛:MICROWIRE?锛孮SPI?锛屼覆琛�锛孲PI? 闆诲闆绘簮:妯℃摤鍜屾暩(sh霉)瀛� 闆绘簮闆诲:1.8 V ~ 3.6 V 宸ヤ綔婧害:-40°C ~ 85°C 瀹夎椤�(l猫i)鍨�:琛ㄩ潰璨艰 灏佽/澶栨:40-WFQFN 瑁搁湶鐒婄洡(p谩n) 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:40-TQFN-EP锛�6x6锛� 鍖呰:鎵樼洡(p谩n)
LTC1289CCSW 鍔熻兘鎻忚堪:IC DATA ACQ SYS 12BIT 3V 20-SOIC RoHS:鍚� 椤�(l猫i)鍒�:闆嗘垚闆昏矾 (IC) >> 鏁�(sh霉)鎿�(j霉)閲囬泦 - ADCs/DAC - 灏�(zhu膩n)鐢ㄥ瀷 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:50 绯诲垪:- 椤�(l猫i)鍨�:鏁�(sh霉)鎿�(j霉)閲囬泦绯荤当(t菕ng)锛圖AS锛� 鍒嗚鲸鐜囷紙浣嶏級:16 b 閲囨ǎ鐜囷紙姣忕锛�:21.94k 鏁�(sh霉)鎿�(j霉)鎺ュ彛:MICROWIRE?锛孮SPI?锛屼覆琛�锛孲PI? 闆诲闆绘簮:妯℃摤鍜屾暩(sh霉)瀛� 闆绘簮闆诲:1.8 V ~ 3.6 V 宸ヤ綔婧害:-40°C ~ 85°C 瀹夎椤�(l猫i)鍨�:琛ㄩ潰璨艰 灏佽/澶栨:40-WFQFN 瑁搁湶鐒婄洡(p谩n) 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:40-TQFN-EP锛�6x6锛� 鍖呰:鎵樼洡(p谩n)
LTC1289CCSW#PBF 鍔熻兘鎻忚堪:IC DATA ACQ SYS 12BIT 3V 20-SOIC RoHS:鏄� 椤�(l猫i)鍒�:闆嗘垚闆昏矾 (IC) >> 鏁�(sh霉)鎿�(j霉)閲囬泦 - ADCs/DAC - 灏�(zhu膩n)鐢ㄥ瀷 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:50 绯诲垪:- 椤�(l猫i)鍨�:鏁�(sh霉)鎿�(j霉)閲囬泦绯荤当(t菕ng)锛圖AS锛� 鍒嗚鲸鐜囷紙浣嶏級:16 b 閲囨ǎ鐜囷紙姣忕锛�:21.94k 鏁�(sh霉)鎿�(j霉)鎺ュ彛:MICROWIRE?锛孮SPI?锛屼覆琛�锛孲PI? 闆诲闆绘簮:妯℃摤鍜屾暩(sh霉)瀛� 闆绘簮闆诲:1.8 V ~ 3.6 V 宸ヤ綔婧害:-40°C ~ 85°C 瀹夎椤�(l猫i)鍨�:琛ㄩ潰璨艰 灏佽/澶栨:40-WFQFN 瑁搁湶鐒婄洡(p谩n) 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:40-TQFN-EP锛�6x6锛� 鍖呰:鎵樼洡(p谩n)
LTC1289CCSW#TR 鍔熻兘鎻忚堪:IC DATA ACQ SYS 12BIT 3V 20SOIC RoHS:鍚� 椤�(l猫i)鍒�:闆嗘垚闆昏矾 (IC) >> 鏁�(sh霉)鎿�(j霉)閲囬泦 - ADCs/DAC - 灏�(zhu膩n)鐢ㄥ瀷 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:50 绯诲垪:- 椤�(l猫i)鍨�:鏁�(sh霉)鎿�(j霉)閲囬泦绯荤当(t菕ng)锛圖AS锛� 鍒嗚鲸鐜囷紙浣嶏級:16 b 閲囨ǎ鐜囷紙姣忕锛�:21.94k 鏁�(sh霉)鎿�(j霉)鎺ュ彛:MICROWIRE?锛孮SPI?锛屼覆琛�锛孲PI? 闆诲闆绘簮:妯℃摤鍜屾暩(sh霉)瀛� 闆绘簮闆诲:1.8 V ~ 3.6 V 宸ヤ綔婧害:-40°C ~ 85°C 瀹夎椤�(l猫i)鍨�:琛ㄩ潰璨艰 灏佽/澶栨:40-WFQFN 瑁搁湶鐒婄洡(p谩n) 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:40-TQFN-EP锛�6x6锛� 鍖呰:鎵樼洡(p谩n)
LTC1289CCSW#TRPBF 鍔熻兘鎻忚堪:IC DATA ACQ SYS 12BIT 3V 20-SOIC RoHS:鏄� 椤�(l猫i)鍒�:闆嗘垚闆昏矾 (IC) >> 鏁�(sh霉)鎿�(j霉)閲囬泦 - ADCs/DAC - 灏�(zhu膩n)鐢ㄥ瀷 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:50 绯诲垪:- 椤�(l猫i)鍨�:鏁�(sh霉)鎿�(j霉)閲囬泦绯荤当(t菕ng)锛圖AS锛� 鍒嗚鲸鐜囷紙浣嶏級:16 b 閲囨ǎ鐜囷紙姣忕锛�:21.94k 鏁�(sh霉)鎿�(j霉)鎺ュ彛:MICROWIRE?锛孮SPI?锛屼覆琛�锛孲PI? 闆诲闆绘簮:妯℃摤鍜屾暩(sh霉)瀛� 闆绘簮闆诲:1.8 V ~ 3.6 V 宸ヤ綔婧害:-40°C ~ 85°C 瀹夎椤�(l猫i)鍨�:琛ㄩ潰璨艰 灏佽/澶栨:40-WFQFN 瑁搁湶鐒婄洡(p谩n) 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:40-TQFN-EP锛�6x6锛� 鍖呰:鎵樼洡(p谩n)
鐧�(f膩)甯冪穵鎬ラ噰璩�(g貌u)锛�3鍒嗛悩宸﹀彸鎮ㄥ皣寰楀埌鍥炲京(f霉)銆�

閲囪臣(g貌u)闇€姹�

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*鍨嬭櫉(h脿o) *鏁�(sh霉)閲� 寤犲晢 鎵硅櫉(h脿o) 灏佽
娣诲姞鏇村閲囪臣(g貌u)

鎴戠殑鑱�(li谩n)绯绘柟寮�

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