參數(shù)資料
型號： ADS7864YB/2K
廠商： Texas Instruments
文件頁數(shù)： 5/27頁
文件大小： 0K
描述： IC 12BIT 500KHZ 6CH A/D 48-TQFP
產(chǎn)品培訓模塊： Data Converter Basics
標準包裝： 2,000
位數(shù)： 12
采樣率（每秒）： 500k
數(shù)據(jù)接口： 并聯(lián)
轉換器數(shù)目： 2
功率耗散（最大）： 50mW
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： 48-TQFP
供應商設備封裝： 48-TQFP（7x7）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 12 個單端，雙極；6 個差分，雙極
配用： 296-30697-ND - EVAL MODULE FOR ADS7864M
www.ti.com
Code (decimal)
8000
7000
6000
5000
4000
3000
2000
1000
0
N
u
m
b
e
r
o
f
C
o
n
v
e
rs
io
n
s
2044
2045
2046
2047
2048
TRANSITION NOISE
DATA
1.4V
Test Point
3k
100pF
C
LOAD
t
R
DATA
Voltage Waveforms for DATA Rise and Fall Times t
R, and tF.
V
OH
V
OL
t
F
ADS7864
SBAS141A – SEPTEMBER 2000 – REVISED MARCH 2005
When the input is differential, the amplitude of the
input is the difference between the +IN and –IN input,
or: (+IN) – (–IN). The peak-to-peak amplitude of each
input is ±1/2V
REF around this common voltage. How-
ever, since the inputs are 180° out of phase, the
peak-to-peak amplitude of the differential voltage is
+V
REF to –VREF. The value of VREF also determines
the range of the voltage that may be common to both
inputs (see Figure 22).
In each case, care should be taken to ensure that the
output impedance of the sources driving the +IN and
–IN inputs are matched. Otherwise, this may result in
offset error, which will change with both temperature
and input voltage.
The input current on the analog inputs depend on a
number of factors: sample rate, input voltage, and
source impedance. Essentially, the current into the
Figure 23. Histogram of 8,000 Conversions of a
ADS7864 charges the internal capacitor array during
DC Input
the sampling period. After this capacitance has been
fully charged, there is no further input current. The
source of the analog input voltage must be able to
charge the input capacitance (15pF) to a 12-bit
settling level within two clock cycles. When the
converter goes into the hold mode, the input im-
pedance is greater than 1G
.
Care must be taken regarding the absolute analog
input voltage. The +IN and –IN inputs should always
remain within the range of GND – 300mV to VDD +
300mV.
Figure 23 shows a histogram plot for the ADS7864
following 8,000 conversions of a DC input. The DC
input was set at output code 2046. All but one of the
conversions had an output code result of 2046 (one
of the conversions resulted in an output of 2047). The
histogram reveals the excellent noise performance of
Figure 24. Test Circuits for Timing Specifications
the ADS7864.
13
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相關代理商/技術參數(shù)
參數(shù)描述
ADS7865 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual, 12-Bit, 3+3 or 2+2 Channel, Simultaneous Sampling Analog-to-Digital Converter
ADS7865I 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual, 12-Bit, 3+3 or 2+2 Channel, Simultaneous Sampling Analog-to-Digital Converter
ADS7865IBPBSR 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual, 12-Bit, 3+3 or 2+2 Channel, Simultaneous Sampling Analog-to-Digital Converter
ADS7865IPBS 功能描述:模數(shù)轉換器 - ADC Dual 2MSPS 12B Simul ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7865IPBSG4 功能描述:模數(shù)轉換器 - ADC Dual,2MSPS,12B,2+2 Ch,ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
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