參數(shù)資料
型號(hào)： AD7738BRU-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 1/28頁(yè)
文件大?。?/td> 0K
描述： IC ADC 24BIT 8CH SIG-DEL 28TSSOP
標(biāo)準(zhǔn)包裝： 1,000
位數(shù)： 24
采樣率（每秒）： 15.4k
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 100mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 105°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 28-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 28-TSSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 8 個(gè)單端，單極；8 個(gè)單端，雙極；4 個(gè)差分，單極；4 個(gè)差分，雙極
配用： EVAL-AD7738EBZ-ND - BOARD EVAL FOR AD7738
REV. 0
a
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Analog Devices, Inc., 2002
AD7738
8-Channel, High Throughput,
24-Bit - ADC
FEATURES
High Resolution ADC
24 Bits No Missing Codes
0.0015% Nonlinearity
Optimized for Fast Channel Switching
18-Bits p-p Resolution (21 Bits Effective) at 500 Hz
16-Bits p-p Resolution (19 Bits Effective) at 8.5 kHz
15-Bits p-p Resolution (18 Bits Effective) at 15 kHz
On-Chip Per Channel System Calibration
Configurable Inputs
8 Single-Ended or 4 Fully Differential
Input Ranges
+625 mV, +1.25 V, +2.5 V,
625 mV,
1.25 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: 28-Lead TSSOP
APPLICATIONS
PLCs/DCS
Multiplexing Applications
Process Control
Industrial Instrumentation
FUNCTIONAL BLOCK DIAGRAM
SCLK
DIN
DOUT
CS
RDY
RESET
SERIAL
INTERFACE
CONTROL
LOGIC
AIN4
AIN5
AIN6
AIN7
MUX
AINCOM/P0
AIN0
AIN1
AIN2
AIN3
DGND
DVDD
REFERENCE
DETECT
REFIN– REFIN+
I/O PORT
SYNC/P1
CLOCK
GENERATOR
MCLKIN
MCLKOUT
MUXOUT ADCIN
AGND
AVDD
24-BIT
-
ADC
BUFFER
AD7738
CALIBRATION
CIRCUITRY
GENERAL DESCRIPTION
The AD7738 is a high precision, high throughput analog front
end. True 16-bit p-p resolution is achievable with a total con-
version time of 117
s (8.5 kHz channel switching), making it
ideally suitable for 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 a 15.4 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 and accepts a common-mode
input voltage from 200 mV above AGND to AVDD – 300 mV.
The multiplexer output is pinned out externally, allowing the
user to implement programmable gain or signal conditioning
before applying the input to the ADC.
The differential reference input features “No-Reference” detect
capability. The ADC also supports per channel system calibra-
tion options.
The digital serial interface can be configured for 3-wire opera-
tion 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 AD7738 family are the AD7734 and the
AD7732.
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 while not
degrading the performance of the adjacent channels.
The AD7732 is similar to AD7734, but its analog front end
features two fully differential input channels.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation
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