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参数资料
| 型号： | AD8842AN |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | DAC |
| 英文描述： | Precision, Quad, SPST Analog Switches |
| 中文描述： | OCTAL, SERIAL INPUT LOADING, 5.4 us SETTLING TIME, 8-BIT DAC, PDIP24 |
| 封装： | 0.300 INCH, PLASTIC, DIP-24 |
| 文件页数： | 1/12页 |
| 文件大小： | 506K |
| 代理商： | AD8842AN |
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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.
a
8-Bit Octal, 4-Quadrant
Multiplying, CMOS TrimDAC
FEATURES
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
APPLICATIONS
Automatic Adjustment
Trimmer Replacement
Vertical Deflection Amplitude Adjustment
Waveform Generation and Modulation
GENERAL DESCRIPTION
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.
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.
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.
TrimDAC is a registered trademark of Analog Devices, Inc.
The current conveyor amplifier is a patented circuit belonging to Analog
Devices, Inc.
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.
Figure 1. Functional Circuit of One 4-Quadrant
Multiplying Channel
Figure 2. Actual Current Conveyor Implementation of
Multiplying DAC Channel
AD8842
FUNCTIONAL BLOCK DIAGRAM
V
IN
R
R
V
OUT
V
OUT
= V
IN
(D/128 – 1)
V
IN
CURRENT CONVEYOR
AMPLIFIER
I1
I2
(1- D)
256
V
IN
R
D
256
V
IN
R
REF
R
R
V
= V
IN
(D/128–1)
LOGIC
SERIAL
REGISTER
DATA
8 X 8
DAC
R
E
G
I
S
T
E
R
S
DECODED
ADDRESS
4
8
8
DAC A
8
AD8842
DAC H
8
V
DD
LD
SDI
CLK
V
IN
A
V
OUT
A
V
IN
H
V
OUT
H
V
SS
PR
SDO
GND
G
G
相关PDF资料 |
PDF描述 |
|---|---|
| AD8842AR | 8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDAC |
| AD8883B | 60 MHz, 2000 V/us Monolithic Op Amp |
| AD892 | Typical Charactoristics |
| AD892E | Typical Charactoristics |
| AD892T | Typical Charactoristics |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8842ANZ | 功能描述:IC DAC 8BIT OCTAL 24DIP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TrimDAC® 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD8842AR | 功能描述:IC DAC 8BIT OCTAL MULT 24-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TrimDAC® 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD8842AR-REEL | 功能描述:IC DAC MULT 8BIT OCTAL 24-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TrimDAC® 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD8842ARZ | 功能描述:IC DAC 8BIT OCTAL MULT 24-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TrimDAC® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 设置时间:4µs 位数:12 数据接口:串行 转换器数目:2 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-uMAX 包装:管件 输出数目和类型:2 电压，单极 采样率（每秒）:* 产品目录页面:1398 (CN2011-ZH PDF) |
| AD8842ARZ | 制造商:Analog Devices 功能描述:DAC OCTAL 8BIT 50KHZ QUAD MUL 24SO |
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