參數(shù)資料
型號(hào)： AD7868BR
廠商： ANALOG DEVICES INC
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： LC2MOS Complete, 12-Bit Analog I/O System
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO28
封裝： PLASTIC, SOIC-28
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 337K
代理商： AD7868BR
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
LC
2
MOS
Complete, 12-Bit Analog I/OSystem
AD7868
Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FUNCT IONAL BLOCK DIAGRAM
RO DAC
RI DAC
DGND
AD7868
R
R
RO ADC
AGND
CLOCK
R
R
12-BIT
DAC
DAC SERIAL
INTERFACE
ADC SERIAL
INTERFACE
12-BIT
ADC
DAC 3V
REFERENCE
ADC 3V
REFERENCE
TRACK/HOLD
V
IN
V
OUT
LDAC
TFS
TCLK
DT
CONTROL
RFS
RCLK
DR
CLK
CONVST
V
DD
V
SS
FEATURES
Complete 12-Bit I/O System, Comprising:
12-Bit ADC with Track/Hold Amplifier
83 kHz Throughout Rate
72 dB SNR
12-Bit DAC with Output Amplifier
3
m
s Settling Time
72 dB SNR
On-Chip Voltage Reference
Operates from
6
5 V Supplies
Low Power – 130 mW typ
Small 0.3" Wide DIP
APPLICATIONS
Digital Signal Processing
Speech Recognition and Synthesis
Spectrum Analysis
High Speed Modems
DSP Servo Control
GE NE RAL DE SCRIPT ION
T he AD7868 is a complete 12-bit I/O system containing a DAC
and an ADC . T he ADC is a successive approximation type
with a track-and-hold amplifier having a combined throughput
rate of 83 kHz. T he DAC has an output buffer amplifier with a
settling time of 3
μ
s to 12 bits. T emperature compensated 3 V
buried Zener references provide precision references for the
DAC and ADC.
Interfacing to both the DAC and ADC is serial, minimizing pin
count and giving a small 24-pin package size. Standard control
signals allow serial interfacing to most DSP machines. Asyn-
chronous ADC conversion control and DAC updating is made
possible with the
CONVST
and
LDAC
logic inputs.
T he AD7868 operates from
±
5 V power supplies, the analog in-
put/output range of the ADC/DAC is
±
3 V. T he part is fully
specified for dynamic parameters such as signal-to-noise ratio
and harmonic distortion as well as traditional dc specifications.
T he part is available in a 24-pin, 0.3" wide, plastic or hermetic
dual-in-line package (DIP) and in a 28-pin, plastic SOIC
package.
PRODUCT HIGHLIGHT S
1. Complete 12-Bit I/O System.
T he AD7868 contains a 12-bit ADC with a track-and-hold
amplifier and a 12-bit DAC with output amplifier. Also
included are separate on-chip voltage references for the DAC
and the ADC.
2. Dynamic Specifications for DSP Users.
In addition to traditional dc specifications, the AD7868 is
specified for ac parameters including signal-to-noise ratio
and harmonic distortion. T hese parameters along with im-
portant timing parameters are tested on every device.
3. Small Package.
T he AD7868 is available in a 24-pin DIP and a 28-pin SOIC
package.
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