參數(shù)資料
型號(hào)： ADS1602
英文描述： 16-Bit, 2.5MSPS Analog-to-Digital Converter
中文描述： 16位2.5MSPS模擬到數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 16/26頁(yè)
文件大?。?/td> 397K
代理商： ADS1602
"#$%&
SBAS341B DECEMBER 2004 REVISED APRIL 2005
www.ti.com
16
INPUT CIRCUITRY
The ADS1602 uses switched-capacitor circuitry to measure
the input voltage. Internal capacitors are charged by the
inputs and then discharged internally with this cycle
repeating at the frequency of CLK. Figure 39 shows a
conceptual diagram of these circuits. Switches S2 represent
the net effect of the modulator circuitry in discharging the
sampling capacitors; the actual implementation is different.
The timing for switches S1 and S2 is shown in Figure 40.
S
1
S
2
10pF
AINP
ADS1602
8pF
VMID
S
1
S
2
10pF
AINN
8pF
VMID
AGND
Figure 39. Conceptual Diagram of Internal
Circuitry Connected to the Analog Inputs
On
S1
S2
Off
On
Off
t
SAMPLE
= 1/f
CLK
Figure 40. Timing for the Switches in Figure 39
DRIVING THE INPUTS
The external circuits driving the ADS1602 inputs must be
able to handle the load presented by the switching capacitors
within the ADS1602. The input switches S1 in Figure 39 are
closed for approximately one-half of the sampling period,
t
sample
, allowing only
≈
11ns for the internal capacitors to be
charged by the inputs when f
CLK
= 40MHz.
Figure 41 and Figure 42 show the recommended circuits
when using single-ended or differential op amps,
respectively.
The analog inputs must be driven
differentially to achieve optimum performance.
The
external capacitors, between the inputs and from each
input to AGND, improve linearity and should be placed as
close to the pins as possible. Place the drivers close to the
inputs and use good capacitor bypass techniques on their
supplies, such as a smaller high-quality ceramic capacitor
in parallel with a larger capacitor. Keep the resistances
used in the driver circuits low—thermal noise in the driver
circuits degrades the overall noise performance. When the
signal can be ac-coupled to the ADS1602 inputs, a simple
RC filter can set the input common-mode voltage. The
ADS1602 is a high-speed, high-performance ADC.
Special care must be taken when selecting the test
equipment and setup used with this device. Pay particular
attention to the signal sources to ensure they do not limit
performance when measuring the ADS1602.
392
OPA2822
ADS1602
AGND
OPA2822
40pF
V
CM(1)
V
CM(1)
V
CM(1)
100pF
AINP
AINN
100pF
(3)
392
40pF
100pF
(1) Recommended V
= 1.5V.
(2) Optional accoupling circuit provides commonmode input voltage.
(3) Increaseto 390pF when f
IN
≤
100kHz for improved SNRandTHD.
(2)
(2)
(2)
(2)
V
IN
2
V
IN
2
392
392
392
0.01
μ
F
0.01
μ
F
392
1
μ
F
392
1k
1k
1
μ
F
392
49.9
49.9
Figure 41. Recommended Driver Circuit Using the
OPA2822
ADS1602
THS4503
22pF
V
IN
+V
IN
100pF
100pF
AINP
AINN
100pF
24.9
392
392
24.9
392
392
22pF
V
CM
Figure 42. Recommended Driver Circuit Using the
THS4503 Differential Amplifier
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS1602EVM 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS1602EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
ADS1602IPFBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2.5MSPS 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
ADS1602IPFBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2.5MSPS 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
ADS1602IPFBT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2.5MSPS 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
ADS1602IPFBTG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2.5MSPS 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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