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參數資料
| 型號： | ADS7864YB/2KG4 |
| 廠商： | Texas Instruments |
| 文件頁數： | 6/27頁 |
| 文件大小： | 0K |
| 描述： | IC 12BIT 500KHZ 6CH ADC 48-TQFP |
| 產品培訓模塊： | Data Converter Basics |
| 標準包裝： | 2,000 |
| 位數： | 12 |
| 采樣率（每秒）： | 500k |
| 數據接口： | 并聯 |
| 轉換器數目： | 2 |
| 功率耗散（最大）： | 50mW |
| 電壓電源： | 模擬和數字 |
| 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 |
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BIPOLAR INPUTS
EXPLANATION OF CLOCK, RESET AND
R
1
R
2
+IN
IN
REF
OUT (pin 33)
2.5V
4k
20k
Bipolar Input
BIPOLAR INPUT
R
1
R
2
±10V
1k
5k
±5V
2k
10k
±2.5V
4k
20k
OPA340
ADS7864
TIMING AND CONTROL
CLOCK
HOLDA
HOLDB
HOLDC
RESET
t
9
t
1
t
6
t
8
t
2
t
3
t
5
t
7
THEORY OF OPERATION
START OF A CONVERSION
ADS7864
SBAS141A – SEPTEMBER 2000 – REVISED MARCH 2005
Hold signals. The FIFO mode will allow the six
registers to be used by a single channel pair, and
The differential inputs of the ADS7864 were designed
therefore three locations for CH X0 and three lo-
to accept bipolar inputs (–VREF and +VREF) around the
cations for CH X1 can be acquired before they are
internal reference voltage (2.5V), which corresponds
read from the part.
to a 0V to 5V input range with a 2.5V reference. By
using a simple op amp circuit featuring a single
amplifier and four external resistors, the ADS7864
BUSY PINS
can be configured to accept bipolar inputs. The
conventional ±2.5V, ±5V, and ±10V input ranges can
CLOCK—An external clock has to be provided for the
be interfaced to the ADS7864 using the resistor
ADS7864. The maximum clock frequency is 8MHz.
values shown in Figure 25.
Figure 25. Level Shift Circuit for Bipolar Input
Ranges
The ADS7864 uses an external clock (CLOCK, pin
Figure 26. Start of the Conversion
22) which controls the conversion rate of the CDAC.
With an 8MHz external clock, the A/D sampling rate
RESET—Bringing reset low will reset the ADS7864. It
is 500kHz which corresponds to a 2s maximum
will clear all the output registers, stop any actual
throughput time.
conversions and will close the sampling switches.
Reset has to stay low for at least 20ns (see Fig-
The ADS7864 contains two 12-bit A/D converters that
conversion (negative hold edge).
operate
simultaneously.
The
three
hold
signals
BUSY—Busy goes low when the internal A/D con-
(HOLDA, HOLDB, HOLDC) select the input MUX and
verters start a new conversion. It stays low as long as
initiate the conversion. A simultaneous hold on all six
the conversion is in progress (see Figure 27, 13
channels can occur with all three hold signals strobed
clock-cycles, t10) and rises again after the data is
together. The converted values are saved in six
latched to the output register. With Busy going high,
registers. For each read operation the ADS7864
the new data can be read. It takes at least 16 clock
outputs 16 bits of information (12 Data, 3 Channel
Address and Data Valid). The Address/Mode signals
(A0, A1, A2) select how the data is read from the
ADS7864. These Address/Mode signals can define a
selection of a single channel, a cycle mode that
By bringing one or all of the HOLDX signals low, the
cycles through all channels or a FIFO mode that
input data of the corresponding channel X is immedi-
sequences the data determined by the order of the
ately placed in the hold mode (5ns). The conversion
of this channel X follows as soon as the A/D
converter is available for the particular channel. If
14
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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:模數轉換器 - ADC Dual 2MSPS 12B Simul ADC RoHS:否 制造商:Texas Instruments 通道數量: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:模數轉換器 - ADC Dual,2MSPS,12B,2+2 Ch,ADC RoHS:否 制造商:Texas Instruments 通道數量: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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