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參數(shù)資料
| 型號： | ADS7870EA |
| 英文描述： | 12-Bit ADC, MUX, PGA and Internal Reference DATA ACQUISITION SYSTEM |
| 中文描述： | 12位ADC，復(fù)用器，PGA和內(nèi)部基準(zhǔn)數(shù)據(jù)采集系統(tǒng) |
| 文件頁數(shù)： | 3/27頁 |
| 文件大?。?/td> | 262K |
| 代理商： | ADS7870EA |
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3
ADS7870
SPECIFICATIONS FOR INTERNAL FUNCTIONS
(1)
(See previous section for the TOTAL DATA ACQUISITION SYSTEM)
At T
A
= +25
°
C, V
DD
= +5.0V, V
REF
= 2.5V connected to BUF
IN
(using internal reference), 2.5MHz CCLK and 2.5MHz SCLK, unless otherwise noted.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
ADS7870EA
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MULTIPLEXER
ON Resistance
OFF Resistance
OFF Channel Leakage Current
ON-Channel = 5.2V, OFF-Channel = 0V
ON-Channel = 0V, OFF-Channel = 5.2V
ON Channel Leakage Current
ON-Channel = 0V, OFF-Channel = 5.2V
500
1
G
V
LNx
= 5.2V
100
100
100
100
pA
pA
pA
pA
ON-Channel = 5.2V, OFF-Channel = 0V
PGA AMPLIFIER
Input Capacitance
(2)
Input Impedance
(2)
Common-Mode
Differential
Offset Voltage
Small-Signal Bandwidth
Settling Time: 0.01%
4 to 9.7
pF
6
7
M
M
μ
V
MHz
μ
s
μ
s
100
5/Gain
0.3
6.4
G = 1
G = 20
ANALOG-TO-DIGITAL CONVERTER
DC CHARACTERISTICS
Resolution
Integral Linearity Error
Differential Linearity Error
No Missing Codes
Offset Error
Full Scale (Gain) Error
Common-Mode Rejection, RTI of A/D
Power Supply Rejection, RTI of ADS7870
12
0.5
0.5
12
0.5
0.02
80
60
LSB
LSB
LSB
Bits
LSB
%
dB
dB
REF
IN
= 2.5V
External Reference, V
DD
= 5V
±
10%
PGA plus A/D CONVERTER
SAMPLING DYNAMICS
Throughput Rate
Conversion Time
Acquisition Time
Auto Zero Time
Aperture Delay
Small Signal Bandwidth
Step Response
f
CCLK
= 2.5 MHz, DF = 1
48 CCLK cycles
12 CCLK cycles
28 CCLK cycles
8 CCLK cycles
36 CCLK cycles
52
4.8
9.6
3.2
12.8
5
kHz
μ
s
μ
s
μ
s
μ
s
MHz
1 Complete Conversion Cycle
NOTES:
(1) The SPECIFICATIONS FOR THE TOTAL SYSTEM are overall analog input-to-digital output specifications. The SPECIFICATIONS FOR INTERNAL
FUNCTIONS indicate the performance of the individual functions in the ADS7870.
(2) The ADS7870 uses switched capacitor techniques for the programmable gain amplifier and A/D converter. A characteristic of such circuits is that the input
capacitance at any selected LNx pin changes during the conversion cycle.
(3) One channel “on” with its inputs grounded. All other channels “off” with sinewave voltage applied to their inputs.
(4) Ratiometric configuration exists when the input source is configured such that changes in the reference cause corresponding changes in the input voltage. The
same accuracy applies when a perfect external reference is used.
(5) The CCLK is divided by the DF value specified by the contents of register ADC CONTROL Register, bits D0 and D1 to produce DCLK. The maximum value
of DCLK is 2.5MHz.
(6) REF and BUF contribute 190
μ
A and 150
μ
A (950
μ
W and 750
μ
W) respectively. At initial power-up the default condition for both REF and BUF functions is power
off. They can be turned on under software control by writing a “1” to D3 and D2 of the REF/OSCILLATOR CONTROL Register.
(7) For V
DD
< 3.0V, V
REF
= 2.5V not usable.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7870EA/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit ADC MUX PGA 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 |
| ADS7870EA/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit ADC MUX PGA 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 |
| ADS7870EA/250 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 12-Bit |
| ADS7870EAG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit ADC MUX PGA 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 |
| ADS7870EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS7870 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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