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参数资料
| 型号： | ADS7864YB/2K |
| 厂商： | Texas Instruments |
| 文件页数： | 6/27页 |
| 文件大小： | 0K |
| 描述： | IC 12BIT 500KHZ 6CH A/D 48-TQFP |
| 产品培训模块： | Data Converter Basics |
| 标准包装： | 2,000 |
| 位数： | 12 |
| 采样率（每秒）： | 500k |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 50mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-TQFP |
| 供应商设备封装： | 48-TQFP（7x7） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 12 个单端，双极；6 个差分，双极 |
| 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS7865 | 制造商:TI 制造商全称: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 制造商全称: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 制造商全称: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:模数转换器 - ADC Dual 2MSPS 12B Simul ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADS7865IPBSG4 | 功能描述:模数转换器 - ADC Dual,2MSPS,12B,2+2 Ch,ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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