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参数资料
| 型号： | 5962-9561501MLX |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | ADC |
| 英文描述： | 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, CDIP24 |
| 封装： | 0.300 INCH, HERMETIC SEALED, CERDIP-24 |
| 文件页数： | 1/22页 |
| 文件大小： | 203K |
| 代理商： | 5962-9561501MLX |
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
AD7890
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2001
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Fast 12-Bit ADC with 5.9
s Conversion Time
Eight Single-Ended Analog Input Channels
Selection of Input Ranges:
10 V for AD7890-10
0 V to 4.096 V for AD7890-4
0 V to 2.5 V for AD7890-2
Allows Separate Access to Multiplexer and ADC
On-Chip Track/Hold Amplifier
On-Chip Reference
High-Speed, Flexible, Serial Interface
Single Supply, Low-Power Operation (50 mW Max)
Power-Down Mode (75
W Typ)
FUNCTIONAL BLOCK DIAGRAM
TRACK/HOLD
2k
AD7890
CEXT
CONVST
VDD
MUX
OUT
SHA
IN
REF OUT/
REF IN
AGND AGND DGND
SCLK
TFS RFS DATA
OUT
DATA
IN
SMODE
VIN8
VIN7
VIN6
VIN5
VIN4
VIN3
VIN2
VIN1
CLK
IN
SIGNAL
SCALING*
SIGNAL
SCALING*
SIGNAL
SCALING*
SIGNAL
SCALING*
SIGNAL
SCALING*
SIGNAL
SCALING*
SIGNAL
SCALING*
SIGNAL
SCALING*
*
NO SCALING ON AD7890-2
CLOCK
OUTPUT/CONTROL REGISTER
12-BIT
ADC
MUX
2.5V
REFERENCE
Power dissipation in normal mode is low at 30 mW typ and the
part can be placed in a standby (power-down) mode if it is not
required to perform conversions. The AD7890 is fabricated in
Analog Devices’ Linear Compatible CMOS (LC
2MOS) process,
a mixed technology process that combines precision bipolar
circuits with low power CMOS logic. The part is available in a
24-lead, 0.3" wide, plastic or hermetic dual-in-line package or in
a 24-lead small outline package (SOIC).
PRODUCT HIGHLIGHTS
1. Complete 12-Bit Data Acquisition System-on-a-Chip
The AD7890 is a complete monolithic ADC combining an
eight-channel multiplexer, 12-bit ADC, 2.5 V reference and
a track/hold amplifier on a single chip.
2. Separate Access to Multiplexer and ADC
The AD7890 provides access to the output of the multiplexer
allowing one antialiasing filter for eight channels—a consid-
erable saving over the eight antialiasing filters required if the
multiplexer was internally connected to the ADC.
3. High-Speed Serial Interface
The part provides a high-speed serial interface for easy con-
nection to serial ports of microcontrollers and DSP processors.
GENERAL DESCRIPTION
The AD7890 is an eight-channel 12-bit data acquisition system.
The part contains an input multiplexer, an on-chip track/hold
amplifier, a high-speed 12-bit ADC, a 2.5 V reference and a
high speed, serial interface. The part operates from a single 5 V
supply and accepts an analog input range of
±10 V (AD7890-10),
0 V to 4.096 V (AD7890-4) and 0 V to 2.5 V (AD7890-2).
The multiplexer on the part is independently accessible. This
allows the user to insert an antialiasing filter or signal conditioning,
if required, between the multiplexer and the ADC. This means
that one antialiasing filter can be used for all eight channels.
Connection of an external capacitor allows the user to adjust the
time given to the multiplexer settling to include any external
delays in the filter or signal conditioning circuitry.
Output data from the AD7890 is provided via a high-speed
bidirectional serial interface port. The part contains an on-chip
control register, allowing control of channel selection, conver-
sion start and power-down via the serial port. Versatile, high
speed logic ensures easy interfacing to serial ports on microcon-
trollers and digital signal processors.
In addition to the traditional dc accuracy specifications such as
linearity, full-scale and offset errors, the AD7890 is also speci-
fied for dynamic performance parameters including harmonic
distortion and signal-to-noise ratio.
LC2MOS 8-Channel, 12-Bit
Serial, Data Acquisition System
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