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| 型号： | ADS8361IRHBTG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 2/29页 |
| 文件大小： | 0K |
| 描述： | IC ADC DUAL 16BIT 500KSPS 32VQFN |
| 产品培训模块： | Data Converter Basics |
| 标准包装： | 250 |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | 串行 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 200mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 8 个单端，双极；4 个差分，双极 |
| 配用： | 296-19922-ND - EVAL MOD FOR ADS8361 296-18350-ND - KIT 5-6K INTERFACE BOARD |
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ADS8361
10
SBAS230E
www.ti.com
REFERENCE
Under normal operation, the REFOUT pin (pin 2) should be
directly connected to the REFIN pin (pin 1) to provide an
internal +2.5V reference to the ADS8361. The ADS8361 can
operate, however, with an external reference in the range of
1.2V to 2.6V for a corresponding full-scale range of 2.4V to
5.2V.
The internal reference of the ADS8361 is buffered. If the
internal reference is used to drive an external load, a buffer
is provided between the reference and the load applied to pin 2
(the internal reference can typically source 10μA of current—
load capacitance should be 0.1μF and 10μF). If an external
reference is used, the second buffer provides isolation be-
tween the external reference and the Capacitve Digital-to-
Analog Converter (CDAC). This buffer is also used to re-
charge all of the capacitors of both CDACs during conver-
sion.
ANALOG INPUT
The analog input is bipolar and fully differential. There are
two general methods of driving the analog input of the
ADS8361: single-ended or differential (see Figures 1 and 2).
When the input is single-ended, the –IN input is held at the
common-mode voltage. The +IN input swings around the
same common voltage and the peak-to-peak amplitude is
the (common-mode + VREF) and the (common-mode – VREF).
The value of VREF determines the range over which the
common-mode voltage may vary (see Figure 3).
When the input is differential, the amplitude of the input is the
difference between the +IN and –IN input, or (+IN) – (–IN). The
peak-to-peak amplitude of each input is ±1/2 VREF around this
common voltage. However, since the inputs are 180° out-of-
phase, the peak-to-peak amplitude of the differential voltage is
+VREF to –VREF. The value of VREF also determines the range
of the voltage that may be common to both inputs (see
Figure 4).
INTRODUCTION
The ADS8361 is a high-speed, low-power, dual, 16-bit A/D
converter that operates from +3V/+5V supply. The input
channels are fully differential with a typical common-mode
rejection of 80dB. The part contains dual, 4μs successive
approximation A/D converter, two differential sample-and-
hold amplifiers, an internal +2.5V reference with REFIN and
REFOUT pins, and a high-speed serial interface. The ADS8361
requires an external clock. In order to achieve the maximum
throughput rate of 500kSPS, the master clock must be set at
10MHz. A minimum of 20 clock cycles are required for each
16-bit conversion.
There are four analog inputs that are grouped into two chan-
nels (A and B). Channel selection is controlled by the M0 (pin
14), M1 (pin 15), and A0 (pin 16) pins. Each channel has two
inputs (A0, A1 and B0, B1) that are sampled and converted
simultaneously, thus preserving the relative phase information
of the signals on both analog inputs. The part accepts an
analog input voltage in the range of –VREF to +VREF, centered
around the internal +2.5V reference. The part will also accept
bipolar input ranges when a level shift circuit is used at the front
end (see Figure 7).
All conversions are initiated on the ADS8361 by bringing the
CONVST pin HIGH for a minimum of 15ns. CONVST HIGH
places both sample-and-hold amplifiers in the hold state
simultaneously and the conversion process is started on both
channels. The RD pin (pin 18) can be connected to CONVST
to simplify operation. Depending on the status of the M0, M1,
and A0 pins, the ADS8361 will (a) operate in either two-
channel or four-channel mode and (b) output data on both
the Serial A and Serial B output or both channels can be
transmitted on the A output only.
NOTE: See the Timing and Control section of this data sheet
for more information.
SAMPLE-AND-HOLD SECTION
The sample-and-hold amplifiers on the ADS8361 allow the
A/D converter to accurately convert an input sine wave of full-
scale amplitude to 16-bit accuracy. The input bandwidth of
the sample-and-hold is greater than the Nyquist rate (Nyquist
equals one-half of the sampling rate) of the A/D converter
even when the A/D converter is operated at its maximum
throughput rate of 500kSPS.
Typical aperture delay time, or the time it takes for the
ADS8361 to switch from the sample to the hold mode
following the CONVST pulse, is 3.5ns. The average delta of
repeated aperture delay values is typically 50ps (also known
as aperture jitter). These specifications reflect the ability of
the ADS8361 to capture AC input signals accurately at the
exact same moment in time.
ADS8361
Single-Ended Input
Common
Voltage
–VREF to +VREF
peak-to-peak
Differential Input
Common
Voltage
VREF
peak-to-peak
VREF
peak-to-peak
FIGURE 1. Methods of Driving the ADS8361 Single-Ended or
Differential.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS8363 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Dual, 1MSPS, 16-/14-/12-Bit, 4x2 or 2x2 Channel, Simultaneous Sampling Analog-to-Digital Converter |
| ADS8363EVM | 功能描述:数据转换 IC 开发工具 ADS8363 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| ADS8363SRHBR | 功能描述:模数转换器 - ADC 16B 1MSPS 4x2/2x2 Simu Sampling SAR 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 |
| ADS8363SRHBT | 功能描述:模数转换器 - ADC 16B 1MSPS 4x2/2x2 Simu Sampling SAR 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 |
| ADS8364 | 制造商:TI 制造商全称:Texas Instruments 功能描述:250kHz, 16-Bit, 6-Channel Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTERS |
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