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AD8842AN

更新时间： 2024-11-23 23:16:19
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
12页 508K
描述
8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDAC

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AD8842AN 数据手册

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8-Bit Octal, 4-Quadrant  
a
Multiplying, CMOS TrimDAC  
AD8842  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Low Cost  
Replaces 8 Potentiometers  
50 kHz 4-Quadrant Multiplying Bandwidth  
Low Zero Output Error  
Eight Individual Channels  
3-Wire Serial Input  
500 kHz Update Data Loading Rate  
±3 V Output Swing  
Midscale Preset, Zero Volts Out  
V
A
IN  
DECODED  
ADDRESS  
G
V
DD  
8 X 8  
DAC  
R
E
G
I
S
T
E
R
S
8
4
8
8
DAC A  
V
A
OUT  
LOGIC  
LD  
AD8842  
DATA  
8
V
V
H
IN  
G
SERIAL  
REGISTER  
SDI  
DAC H  
APPLICATIONS  
Automatic Adjustment  
H
OUT  
CLK  
Trimmer Replacement  
Vertical Deflection Amplitude Adjustment  
Waveform Generation and Modulation  
GND  
V
SDO PR  
SS  
GENERAL DESCRIPTION  
The AD8842 consumes only 95 mW from ±5 V power supplies.  
For single 5 V supply applications consult the DAC-8841. The  
AD8842 is pin compatible with the 1 MHz multiplying band-  
width DAC8840. The AD8842 is available in 24-pin plastic  
DIP and surface mount SOL-24 packages.  
The AD8842 provides eight general purpose digitally controlled  
voltage adjustment devices. The TrimDAC® capability allows  
replacement of the mechanical trimmer function in new designs.  
The AD8842 is ideal for ac or dc gain control of up to 50 kHz  
bandwidth signals. The four-quadrant multiplying capability is  
useful for signal inversion and modulation often found in video  
vertical deflection circuitry.  
R
R
VIN  
Internally the AD8842 contains eight voltage output digital-to-  
analog converters, each with separate voltage inputs. A new  
current conveyor amplifier design performs the four-quadrant  
multiplying function with a single amplifier at the output of the  
current steering digital-to-analog converter. This approach of-  
fers an improved constant input resistance performance versus  
previous voltage switched DACs used in TrimDAC circuits,  
eliminating the need for additional input buffer amplifiers.  
VOUT  
VOUT = VIN • (D/128 – 1)  
Figure 1. Functional Circuit of One 4-Quadrant  
Multiplying Channel  
Each DAC has its own DAC register that holds its output state.  
These DAC registers are updated from an internal serial-to-  
parallel shift register that is loaded from a standard 3-wire serial  
input digital interface. Twelve data bits make up the data word  
clocked into the serial input register. This data word is decoded  
where the first 4 bits determine the address of the DAC register  
to be loaded with the last 8 bits of data. A serial data output pin  
at the opposite end of the serial register allows simple daisy  
chaining in multiple DAC applications without additional exter-  
nal decoding logic.  
CURRENT CONVEYOR  
AMPLIFIER  
V
IN  
REF  
V
OUT  
(D/128–1)  
V
R
D
256  
IN  
I1  
I2  
= V  
IN  
V
R
(1- D)  
256  
R
IN  
R
TrimDAC is a registered trademark of Analog Devices, Inc.  
The current conveyor amplifier is a patented circuit belonging to Analog  
Devices, Inc.  
Figure 2. Actual Current Conveyor Implementation of  
Multiplying DAC Channel  
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  
which 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: 617/329-4700  
Fax: 617/326-8703  
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AD8842AN 替代型号

型号 品牌 替代类型 描述 数据表
AD8842ANZ ADI

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