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參數(shù)資料
| 型號(hào)： | XRD87L99AIQ |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 3/24頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT 2MSPS 44PQFP |
| 產(chǎn)品變化通告： | Obsolescence Notification 15/Apr/2010 |
| 標(biāo)準(zhǔn)包裝： | 160 |
| 位數(shù)： | 10 |
| 采樣率（每秒）： | 2M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 功率耗散（最大）： | 450mW |
| 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： | 44-QFP |
| 供應(yīng)商設(shè)備封裝： | 44-PQFP（10x10） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | * |
XRD87L99
xr
LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX
REV. 1.0.0
11
FIGURE 7. DNL MEASUREMENT ON PRODUCTION
TESTER
The formulas for Differential Non-Linearity (DNL), In-
tegral Non-Linearity (INL) and zero and full scale er-
rors (EZS, EFS) are:
DNL (001) = V002 - V001 - LSB
: : :
DNL (3FE) = V3FF - V3FE - LSB
EFS (full scale error) = V3FF - [VREF(+) -1.5 * LSB]
EZS (zero scale error) = V001 - [VREF(-) + 0.5 * LSB]
FIGURE 8. REAL A/D TRANSFER CURVE
Figure 8 shows the zero scale and full scale error
terms.
Figure 9 gives a visual definition of the INL error. The
chart shows a 3-bit converter transfer curve with
greatly exaggerated DNL errors to show the deviation
of the real transfer curve from the ideal one.
After a tester has measured all the transition voltag-
es, the computer draws a line parallel to the ideal
transfer line. By definition the best fit line makes
equal the positive and the negative INL errors. For ex-
ample, an INL error of -1 to +2 LSB's relative to the
Ideal Line would be +1.5 LSB's relative to the best fit
line.
FIGURE 9. INL ERROR CALCULATION
1.2
CLOCK AND CONVERSION TIMING
A system will clock the XRD87L99 continuously or it
will give clock pulses intermittently when a conversion
is desired. The timing of Figure 10a shows normal
operation, while the timing of Figure 10b keeps the
XRD87L99 in balance and ready to sample the ana-
log input.
N + 1
N
N - 1
Output
Codes
Analog
Input
(N) Code Width = V
(N+1) - V(N)
LSB = [ V
REF(+) - VREF(-) ] / 1024
DNL
(N) = [ V(N+1) - V(N) ] - LSB
LSB
DNL
V
(N+1)
V
(N)
DIGITAL
CODES
0.5
LSB
000
001
002
3FE
3FF
V
1.5
LSB
V001
V002
V
3FE
V
3FF
V
REF(-)
V
REF(+)
EZS
EFS
7
6
5
4
3
2
1
Output
Codes
Best Fit Line
EFS
EZS
LSB
Real Transfer Line
INL
Analog Input (Volt)
Ideal Transfer Line
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| XRD87L99AIQ-F | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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