- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375263 > ADS1255 Very Low Noise, 24-Bit Analog-to-Digital Converter PDF資料下載
參數(shù)資料
| 型號： | ADS1255 |
| 英文描述： | Very Low Noise, 24-Bit Analog-to-Digital Converter |
| 中文描述： | 極低噪聲，24位模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 28/39頁 |
| 文件大?。?/td> | 427K |
| 代理商： | ADS1255 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁當(dāng)前第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁
SBAS288D JUNE 2003 REVISED AUGUST 2004
www.ti.com
28
APPLICATIONS INFORMATION
GENERAL RECOMMENDATIONS
The ADS1255 and ADS1256 are very high-resolution A/D
converters. Getting the optimal performance from them
requires careful attention to their support circuitry and
printed circuit board (PCB) design. Figure 25 shows the
basic connections for the ADS1255. It is recommended to
use a single ground plane for both the analog and digital
supplies. This ground plane should be shared with the
bypass capacitors and analog conditioning circuits.
However, avoid using this ground plane for noisy digital
components such as microprocessors. If a split ground
plane is used with the ADS1255/6, make sure the analog
and digital planes are tied together. There should not be a
voltage difference between the ADS1255/6 analog and
digital ground pins (AGND and DGND).
As with any precision circuit, use good supply bypassing
techniques. A smaller value ceramic capacitor in parallel
with a larger value tantalum or a larger value low-voltage
ceramic capacitor works well. Place the capacitors, in
particular the ceramic ones, close to the supply pins. Run
the digital logic off as low of voltage as possible. This helps
reduce coupling back to the analog inputs. Avoid ringing
on the digital inputs. Small resistors (
≈
100
) in series with
the digital pins can help by controlling the trace
impedance. When not using the RESET or SYNC/PDWN
inputs, tie directly to the ADS1255/6 DVDD pin.
Pay special attention to the reference and analog inputs.
These are the most critical circuits. On the voltage
reference inputs, bypass with low equivalent series
resistance (ESR) capacitors. Make these capacitors as
large as possible to maximize the filtering on the reference.
With the outstanding performance of the ADS1255/6, it is
easy for the voltage reference to limit overall performance
if not carefully selected. When using a stand-alone
reference, make sure it is very low noise and very low drift.
Ratiometric measurements, where the input signal and
reference track each other, are somewhat less sensitive,
but verify the reference signal is clean.
Often times, only a simple RC filter (as shown in Figure 25)
is needed on the inputs. This circuit limits the
high-frequency noise near the modulator frequency; see
the Frequency Response section. Avoid low-grade
dielectrics for the capacitors to minimize temperature
variations and leakage. Keep the input traces as short as
possible and place the components close to the input pins.
When using the ADS1256, make sure to filter all the input
channels being used.
AVDD
AGND
VREFN
VREFP
AINCOM
AIN0
AIN1
SYNC/PDWN
RESET
DVDD
D1
D0/CLKOUT
SCLK
DIN
DOUT
DRDY
CS
XTAL1/CLKIN
XTAL2
DGND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
ADS1255
49.9
49.9
10
μ
F
0.1
μ
F
100pF
0.1
μ
F
47
μ
F
2.5V
301
301
100pF
0.1
μ
F
VIN
P
+3.3V
10
μ
F
0.1
μ
F
+5V
VIN
N
100
100
100
18pF
7.68MHz
18pF
Figure 25. ADS1255 Basic Connections
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS1256 | Very Low Noise, 24-Bit Analog-to-Digital Converter |
| ADS1271 | 24 BIT WIDE BANDWIDTH ANALOG TO DIGITAL CONVERTER |
| ADS1271IPW | 24 BIT WIDE BANDWIDTH ANALOG TO DIGITAL CONVERTER |
| ADS1271IPWR | 24 BIT WIDE BANDWIDTH ANALOG TO DIGITAL CONVERTER |
| ADS1271EVM-PDK | modular EVM form factor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1255IDB | 制造商:BB 制造商全稱:BB 功能描述:Very Low Noise, 24-Bit Analog-to-Digital Converter |
| ADS1255IDBR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24 Bit 30kSPS Very Lo-Noise Delta-Sigma 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 |
| ADS1255IDBRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24 Bit 30kSPS Very Lo-Noise Delta-Sigma 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 |
| ADS1255IDBT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24 Bit 30kSPS Very Lo-Noise Delta-Sigma 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 |
| ADS1255IDBT | 制造商:Texas Instruments 功能描述:ADC 24BIT 5V SPI 30MSPS 20SSOP 制造商:Texas Instruments 功能描述:ADC, 24BIT, 5V, SPI, 30MSPS, 20SSOP 制造商:Texas Instruments 功能描述:ADC, 24BIT, 5V, SPI, 30MSPS, 20SSOP; Resolution (Bits):24bit; Sampling Rate:30kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:36mA; Digital IC Case Style:SSOP; No. of Pins:20; ;RoHS Compliant: Yes 制造商:Texas Instruments 功能描述:ADC, 24BIT, 5V, SPI, 30KSPS, 20SSOP ;ROHS COMPLIANT: YES |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。