參數(shù)資料
型號(hào)： ADS7870
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(yè)數(shù)： 8/27頁(yè)
文件大?。?/td> 262K
代理商： ADS7870
8
ADS7870
OVERVIEW
The ADS7870 is a complete data acquisition device com-
posed of an input analog multiplexer (MUX), a program-
mable gain amplifier (PGA) and an analog-to-digital con-
verter (A/D). Four lines of digital input/output (I/O) are also
provided. Additional circuitry provides support functions
including conversion clock, voltage reference, and serial
interface for control and data retrieval.
Control and configuration of the ADS7870 is accomplished
by command bytes written to internal registers through the
serial port. Command register device control includes MUX
channel selection, PGA gain, A/D start conversion com-
mand, and I/O line control. Command register configuration
control includes internal voltage reference setting and oscil-
lator control.
Operational modes and selected functions can be activated
by digital inputs at corresponding pins. Pin settable configu-
ration options include SCLK active-edge selection, master
reset, and internal oscillator clock enable.
The ADS7870 has eight analog-signal input pins, LN0
through LN7. These pins are connected to a network of
analog switches (the “MUX” block in Figure 1). The inputs
can be configured as 8 single ended or 4 differential inputs.
The four general-purpose digital I/O pins (I/O3 through
I/O0) can be made to function individually as either digital
inputs or digital outputs. These pins give the user access to
four digital I/O pins through the serial interface without
having to run additional wires to the host controller.
The programmable gain amplifier (PGA) provides gains of
1, 2, 4, 5, 8, 10, 16, and 20V/V.
The 12-bit A/D converter in the ADS7870 is a successive
approximation type. The output of the converter is 2’s
complement format and can be read MSB first or LSB first.
The ADS7870’s internal voltage reference can be software
configured for output voltages of 1.15V, 2.048V or 2.5V.
The reference circuit is trimmed for high initial accuracy and
low temperature drift. A separate buffer amplifier is pro-
vided to buffer the high impednace V
REF
output.
The voltage reference, PGA, and A/D converter use the
conversion clock (CCLK) and signals derived from it. CCLK
can be either an input or output signal. The ADS7870 can
divide the CCLK signal by a constant before it is applied to
the A/D converter or PGA. This allows a higher frequency
system clock to be used to control the A/D converter
operation. Division factors (DF) of 1, 2, 4 and 8 are avail-
able. The signal that is actually applied to the PGA and
A/D converter is DCLK, where DCLK = CCLK/DF.
The ADS7870 is designed so that its serial interface can be
conveniently used with a wide variety of micro-controllers.
It has four conventional serial interface pins: SCLK (serial
data clock), DOUT (serial data out), DIN (serial data in,
which may be set bi-directional in some applications), and
CS (chip select function).
The ADS7870 has ten internal user accessible registers
which are used in normal operation to configure and control
the device (see Table II, Register Address Map).
REF
Serial
Interface
ADS7870
DIN
SCLK
CS
CONVERT
RESET
RISE/FALL
BUSY
DOUT
Clock
Divider
Oscillator
OSC ENABLE
CCLK
BUF
OUT
/REF
IN
BUF
IN
V
REF
28
27
26
12-Bit
A/D
BUF
MUX
1
2
3
4
5
6
7
8
19
18
17
16
9
10
23
20
21
22
LN0
LN1
LN2
LN3
LN4
LN5
LN6
LN7
11
12
13
14
Digital
I/O
Registers
and
Control
I/O 0
I/O 1
I/O 2
I/O 3
V
DD
24
PGA
Gnd
25
FIGURE 1. Basic Circuit Diagram.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS7870EA 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/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
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