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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)： | 11/27頁 |
| 文件大小： | 262K |
| 代理商： | ADS7870EA |
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11
ADS7870
The ADS7870 is controlled by commands written to the
serial interface as shown in Table I. This eight-bit word
defines either the
direct
mode or
register
mode (see operat-
ing mode text).
Communication through the serial interface is dependent on
the micro-controller providing an instruction byte followed
by either additional data (for a write operation) or additional
clocks to allow the ADS7870 to provide data (for a read
operation). Special operating modes for reducing the in-
struction byte overhead for retrieving conversion results are
provided.
Reset of device (RESET), start of conversion (CONVERT),
and oscillator enable (OSC ENABLE) can be done by
signals to external pins or entries to internal registers. The
actual execution of each of these commands is a logical OR
function; either pin or register signal TRUE cause the
function to execute. The CONVERT pin signal is an edge-
triggered event, with a hold time of two DCLK periods for
de-bounce.
OPERATING MODES
The ADS7870 serial interface operates based on an instruc-
tion byte followed by an action commanded by the contents
of that instruction. The 8-bit instruction word is clocked into
START CONVERSION INSTRUCTION BYTE (Direct Mode)
(1)
BIT
SYMBOL
NAME
VALUE
FUNCTION
D7
Mode Select
1
Starts a Conversion Cycle (Direct Mode)
D6-D4
G2-G0
PGA Gain Select
000
001
010
011
100
101
110
111
PGA Gain = 1 (power up default condition)
PGA Gain = 2
PGA Gain = 4
PGA Gain = 5
PGA Gain = 8
PGA Gain = 10
PGA Gain = 16
PGA Gain = 20
D3-D0
M3-M0
Input Channel Select
See
Determines input channel selection for the requested
conversion, differential or single-ended configuration.
Table III
NOTE: (1) The seven lower bits of this byte are also written to register 4, the Gain/Mux register.
READ/WRITE INSTRUCTION BYTE (Register Mode)
BIT
SYMBOL
NAME
VALUE
FUNCTION
D7
Mode Select
0
Initiates a read or write operation (Register Mode)
D6
R/W
Read/Write Select
0
1
Write Operation
Read Operation
D5
16/8
Word Length
0
1
8-Bit Word
16-Bit Word (2 eight-bit bytes)
D4-D0
AS4-AS0
Register Address
See
Table II
Determines the address of the register that is
to be read from or written to.
D7 (MSB)
D6
D5
D4
D3
D2
D1
D0
1
G2
G1
G0
M3
M2
M1
M0
OR
0
R/W
16/8
AS4
AS3
AS2
AS1
AS0
Start Conversion
(Direct Mode)
Read/Write
(Register Mode)
INSTRUCTION BYTE
TABLE I. Instruction Byte Addressing.
the DIN input. There are two types of instruction bytes that
may be written to the ADS7870 as determined by Bit D7 of
the instruction word (see Table I). These two instructions
represent two different operating modes. In direct mode (Bit
D7 = 1), a conversion is started. A register mode (Bit D7 =
0) instruction is followed by a Read or Write Operation to
the specified register.
Direct Mode
In the direct mode a conversion is initiated by writing a
single 8-bit instruction byte to the ADS7870 (Bit D7 is set
to “1”). Writing the direct mode command sets the configu-
ration of the multiplexer, selects the gain of the PGA, and
starts a conversion cycle. After the last bit of the instruction
byte is received, the ADS7870 performs a conversion on the
selected input channel with the PGA gain set as indicated in
the instruction byte.
The conversion cycle will begin on the second falling edge
of CCLK after the eighth active edge of SCLK of the
instruction byte. When the conversion is complete the con-
version result will be stored in the A/D Output registers and
is available to be clocked out of the serial interface by the
controlling device using the READ operation in the Register
Mode.
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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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