參數(shù)資料
型號(hào)： ADS1256IDBT
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(yè)數(shù)： 11/39頁(yè)
文件大?。?/td> 427K
代理商： ADS1256IDBT
SBAS288D JUNE 2003 REVISED AUGUST 2004
www.ti.com
11
OVERVIEW
The ADS1255 and ADS1256 are very low-noise A/D
converters. The ADS1255 supports one differential or two
single-ended inputs and has two general-purpose digital
I/Os. The ADS1256 supports four differential or eight
single-ended inputs and has four general-purpose digital
I/Os. Otherwise, the two units are identical and are
referred to together in this data sheet as the ADS1255/6.
Figure 5 shows a block diagram of the ADS1256. The
input multiplexer selects which input pins are connected to
the A/D converter. Selectable current sources within the
input multiplexer can check for open- or short-circuit
conditions on the external sensor. A selectable onboard
input buffer greatly reduces the input circuitry loading by
providing up to 80M
of impedance. A low-noise PGA
provides a gain of 1, 2, 4, 8, 16, 32, or 64. The ADS1255/6
converter is comprised of a 4th-order, delta-sigma
modulator followed by a programmable digital filter.
The modulator measures the amplified differential input
signal, V
IN
= (AIN
P
– AIN
N
), against the differential
reference, V
REF
= (VREFP VREFN). The differential
reference is scaled internally by a factor of two so that the
full-scale input range is
±
2V
REF
(for PGA = 1).
The digital filter receives the modulator signal and
provides a low-noise digital output. The data rate of the
filter is programmable from 2.5SPS to 30kSPS and allows
tradeoffs between resolution and speed.
Communication is done over an SPI-compatible serial
interface with a set of simple commands providing control of
the ADS1255/6. Onboard registers store the various settings
for the input multiplexer, sensor detect current sources, input
buffer enable, PGA setting, data rate, etc. Either an external
crystal or clock oscillator can be used to provide the clock
source. General-purpose digital I/Os provide static read/write
control of up to four pins. One of the pins can also be used
to supply a programmable clock output.
XTAL2
SPI
Serial
Interface
Input
Multiplexer
and
Sensor
Detect
Programmable
Digital Filter
A/D
Converter
4thOrder
Modulator
VREFP VREFN
Buffer
V
REF
2V
REF
AIN0
AIN1
AIN
P
AIN
N
AIN7
XTAL1/CLKIN
RESET
DRDY
SCLK
DIN
DOUT
SYNC/PDWN
AIN2
AIN3
AIN4
AIN5
AIN6
AINCOM
CS
Control
Clock
Generator
PGA
1:64
V
IN
PGA
Σ
2
Σ
A
ADS1256
Only
D3 D2
D1 D0/CLKOUT
General
Purpose
Digital I/O
Figure 5. Block Diagram
相關(guān)PDF資料
PDF描述
ADS1255 Very Low Noise, 24-Bit Analog-to-Digital Converter
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS1256IDBTG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24Bit 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
ADS1257IRGWR 功能描述:ANALOG TO DIGITAL CONVERTERS - A 制造商:texas instruments 系列:* 包裝:帶卷（TR） 零件狀態(tài):在售 封裝/外殼:20-VQFN 裸露焊盤(pán) 供應(yīng)商器件封裝:20-VQFN（5x5） 標(biāo)準(zhǔn)包裝:3,000
ADS1257IRGWT 功能描述:24 Bit Analog to Digital Converter 2, 3 Input 1 Sigma-Delta 20-VQFN (5x5) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 位數(shù):24 采樣率（每秒）:30k 輸入數(shù):2，3 輸入類型:差分，單端 數(shù)據(jù)接口:SPI 配置:MUX-PGA-ADC 無(wú)線電 - S/H:ADC:- A/D 轉(zhuǎn)換器數(shù):1 架構(gòu):三角積分 參考類型:外部 電壓 - 電源，模擬:5V 電壓 - 電源，數(shù)字:1.8 V ~ 3.6 V 特性:PGA 工作溫度:-40°C ~ 105°C 封裝/外殼:20-VQFN 裸露焊盤(pán) 供應(yīng)商器件封裝:20-VQFN（5x5） 標(biāo)準(zhǔn)包裝:1
ADS1258 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-Channel, 24-Bit Analog-to-Digital Converter
ADS1258-EP 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-CHANNEL, 24-BIT ANALOG-TO-DIGITAL CONVERTER
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