參數(shù)資料
型號(hào)： ADS8361
英文描述： Dual, 500kSPS, 16-Bit, 2 + 2 Channel, Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTER
中文描述： 雙路，500kSPS，16位，2通道，同步采樣模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 10/23頁(yè)
文件大小： 444K
代理商： ADS8361
ADS8361
SBOS230C
10
www.ti.com
REFERENCE
Under normal operation, the REF
OUT
pin (pin 2) should be
directly connected to the REF
IN
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 10
μ
A of current
—
load capacitance should be 0.1
μ
F and 10
μ
F). 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 + V
REF
) and the (common-mode
–
V
REF
).
The value of V
REF
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 V
REF
around this
common voltage. However, since the inputs are 180
°
out-of-
phase, the peak-to-peak amplitude of the differential voltage is
+V
REF
to
–
V
REF
. The value of V
REF
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, 4
μ
s successive
approximation A/D converter, two differential sample-and-
hold amplifiers, an internal +2.5V reference with REF
IN
and
REF
OUT
pins, and a high-speed serial interface. The ADS8361
requires an external clock. In order to achieve the maximum
throughput rate of 500kHz, 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
–
V
REF
to +V
REF
, 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 500kHz.
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
ADS8361
Single-Ended Input
Common
Voltage
–
V
to +V
peak-to-peak
Differential Input
Common
Voltage
V
peak-to-peak
V
peak-to-peak
FIGURE 1. Methods of Driving the ADS8361 Single-Ended or
Differential.
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ADS8361EVM 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 ADS8361 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
ADS8361IBDBQ 制造商:Rochester Electronics LLC 功能描述:DUAL 250KHZ-16 BIT, 2+2 CHANNEL - Bulk 制造商:Texas Instruments 功能描述:DUAL 250KHZ-16 BIT, 2+2 CHANNEL - Rail/Tube
ADS8361IBDBQR 制造商:Texas Instruments 功能描述:DUAL 250KHZ-16 BIT, 2+2 CHANNEL - Tape and Reel
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ADS8361IDBQG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 500 kSPS 2 ADC 4ch ser out 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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