參數(shù)資料
型號(hào)： ADS5220IPFBR
英文描述： 12-Bit, 40MSPS Sampling, +3.3V ANALOG-TO-DIGITAL CONVERTER
中文描述： 12位，40MSPS采樣，3.3V的模擬數(shù)字轉(zhuǎn)換器
文件頁數(shù)： 14/20頁
文件大?。?/td> 433K
代理商： ADS5220IPFBR
ADS5220
SBAS261A
14
www.ti.com
EXTERNAL REFERENCE
For even more design flexibility, the ADS5220 can be oper-
ated with external references. Utilization of an external refer-
ence voltage may be considered for applications requiring
higher accuracy, improved temperature stability, or flexible
full-scale range. Particularly in multi-channel applications,
the use of a common external reference offers the benefit of
improving gain matching between converters. Setting RSEL
to AV
DD
(+3.3V) provides an external reference mode for the
ADS5220. In this case, the internal V
REF
amplifier is powered
down, and the V
REF
pin requires an external reference
voltage between +0.5V to +1V to provide an input full-scale
range of 1V
PP
to 2V
PP
. The REFT and REFB will appear with
the voltage as shown in Table I, and input FSR is always
twice the voltage at the V
REF
pin. A voltage reference
(REF1004 or TPS79225) and a single-supply amplifier
(OPA2234 or OPA4227) can be used to generate a precision
external reference.
ADS5220
RSEL
VREF
REFT
REFB
2.2
μ
F
+
+
+
0.1
μ
F
10
μ
F
2.2
μ
F
2
2
2.2
μ
F
15
μ
F
0.5V
Output
+
402
15
μ
F
402
+3.3V
ADS5220
RSEL
VREF
REFT
REFB
2.2
μ
F
+
+
0.1
μ
F
2
10
μ
F
2.2
μ
F
2
2.2
μ
F
R
2
R
1
+
+
402
15
μ
F
15
μ
F
402
+3.3V
ADS5220
RSEL
VREF
REFT
REFB
2.2
μ
F
+
+
0.1
μ
F
2
10
μ
F
2.2
μ
F
2
2.2
μ
F
Input
0.5V to 1V
AV
DD
+
+
402
15
μ
F
15
μ
F
402
+3.3V
FIGURE 8. Internal Reference Mode for V
REF
= 0.5V.
FIGURE 9. Internal Reference Mode for V
REF
= 0.5
(1 + R
2
/R
1
).
FIGURE 10. External Reference Configuration.
BINARY TWO
’
S
COMPLEMENT
(BTC)
STRAIGHT OFFSET
BINARY (SOB)
DIFFERENTIAL INPUT
+FS
–
1LSB
(+FS: IN = 2V,
IN
= 1V)
+1/2 FS
(IN = 1.75V,
IN
= 1.25V)
Bipolar Zero
(IN =
IN
= 1.5V)
–
1/2 FS
(
IN
= 1.75V, IN = 1.25V)
–
FS
(
IN
= 2V, IN = 1V)
1111 1111 1111
0111 1111 1111
1100 0000 0000
0100 0000 0000
1000 0000 0000
0000 0000 0000
0100 0000 0000
1100 0000 0000
0000 0000 0000
1000 0000 0000
TABLE II. Coding Table for Differential Input Configuration
with FSR of 2V
PP
.
DIGITAL OUTPUTS
DATA OUTPUT FORMAT
The ADS5220 makes two data output formats available,
either the Straight Offset Binary (SOB) code or the Binary
Two
’
s Complement (BTC) code. The selection of the output
coding is controlled through the MSBI pin. Applying a logic
high will enable the BTC coding, whereas a logic low will
enable the SOB code. In its default configurations the MSBI
pin assumes a logic low level (internal pull-down) and the
ADS5220 will operate with the SOB output coding. The two
code structures are identical with one exception: the MSB is
inverted for the BTC format, as shown in Table II. If the input
signal exceeds the FSR, the output code will remain at all 1s
or all 0s.
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ADS5220IRGZR 制造商:BB 制造商全稱:BB 功能描述:12-Bit, 40MSPS Sampling, +3.3V ANALOG-TO-DIGITAL CONVERTER
ADS5220PFBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit 40MSPS +3.3V 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
ADS5220PFBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit 40MSPS +3.3V 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
ADS5220PFBT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit 40MSPS +3.3V 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
ADS5220PFBTG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit 40MSPS +3.3V 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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