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参数资料
型号： AD7739BRU-REEL
厂商： ANALOG DEVICES INC
元件分类： ADC
英文描述： 8-Channel, High Throughput, 24-Bit Sigma-Delta ADC
中文描述： 8-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24
封装： MS-153AD, TSSOP-24
文件页数： 1/32页
文件大小： 380K
代理商： AD7739BRU-REEL
8-Channel, High Throughput,
24-Bit
∑
- ADC
AD7739
FEATURES
High resolution ADC
24 bits no missing codes
±0.0015% nonlinearity
Optimized for fast channel switching
18-bit p-p resolution (21 bits effective) at 500 Hz
16-bit p-p resolution (19 bits effective) at 4 kHz
On-chip per channel system calibration
Configurable inputs
8 single-ended or 4 fully differential
Input ranges
+625 mV, ±625 mV, +1.25 V, ±1.25 V, +2.5 V, ±2.5 V
3-wire serial interface
SPI, QSPI, MICROWIRE, and DSP compatible
Schmitt trigger on logic inputs
Single-supply operation
5 V analog supply
3 V or 5 V digital supply
Package: 24-lead TSSOP
APPLICATIONS
PLCs/DCSs
Multiplexing applications
Process control
Industrial instrumentation
GENERAL DESCRIPTION
The AD7739 is a high precision, high throughput analog front
end. True 16-bit p-p resolution is achievable with a total
conversion time of 250 μs (4 kHz channel switching), making it
ideally suited to high resolution multiplexing applications.
The part can be configured via a simple digital interface, which
allows users to balance the noise performance against data
throughput up to 15 kHz.
The analog front end features eight single-ended or four fully
differential input channels with unipolar or bipolar 625 mV,
1.25 V, and 2.5 V input ranges. It accepts a common-mode input
voltage from 200 mV above AGND to AV
DD
– 300 mV.
The differential reference input features “No-Reference” detect
capability. The ADC also supports per channel system
calibration options.
FUNCTIONAL BLOCK DIAGRAM
SCLK
DIN
DOUT
CS
RDY
RESET
SERIAL
INTERFACE
CONTROL
LOGIC
AIN4
AIN5
AIN6
AIN7
MUX
AINCOM/P0
AIN0
AIN1
AIN2
AIN3
REFERENCE
DETECT
REFIN(–)
REFIN(+)
I/O PORT
SYNC/P1
CLOCK
GENERATOR
24-BIT
Σ
-
ADC
BUFFER
AD7739
CALIBRATION
CIRCUITRY
DGND
DV
DD
MCLKIN
MCLKOUT
AGND
AV
DD
03742-0-001
Figure 1.
The digital serial interface can be configured for 3-wire
operation and is compatible with microcontrollers and digital
signal processors. All interface inputs are Schmitt triggered.
The part is specified for operation over the extended industrial
temperature range of –40°C to +105°C.
Other parts in the AD7739 family are the AD7738, AD7734,
and AD7732.
The AD7738 is similar to the AD7739 but has higher speed
(8.5 kHz channel switching for 16-bit performance) and higher
AIN leakage current. The AD7738 multiplexer output is pinned
out externally, allowing the user to implement programmable
gain or signal conditioning before being applied to the ADC.
The AD7734 analog front end features four single-ended input
channels with unipolar or true bipolar input ranges to ±10 V
while operating from a single +5 V analog supply. The AD7734
accepts an analog input overvoltage to ±16.5 V without
degrading the performance of the adjacent channels.
The AD7732 is similar to the AD7734, but its analog front end
features two fully differential input channels.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
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