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參數資料
| 型號： | AD7801BRZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 1/16頁 |
| 文件大小： | 0K |
| 描述： | IC DAC 8BIT PARALLEL INP 20-SOIC |
| 產品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 400 |
| 設置時間： | 1.2µs |
| 位數： | 8 |
| 數據接口： | 并聯 |
| 轉換器數目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 12.9mW |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 20-SOIC W |
| 包裝： | 帶卷 (TR) |
| 輸出數目和類型： | 1 電壓，單極；1 電壓，雙極 |
| 采樣率（每秒）： | 833k |
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
AD7801
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
Analog Devices, Inc., 1997
+2.7 V to +5.5 V, Parallel Input,
Voltage Output 8-Bit DAC
FUNCTIONAL BLOCK DIAGRAM
INPUT
REGISTER
DAC
REGISTER
I DAC
÷2
POWER-ON
RESET
AD7801
VOUT
AGND
PD
CLR
LDAC
REFIN
VDD
DGND
D7
D0
WR
CS
I/V
MUX
CONTROL
LOGIC
FEATURES
Single 8-Bit DAC
20-Pin SOIC/TSSOP Package
+2.7 V to +5.5 V Operation
Internal and External Reference Capability
DAC Power-Down Function
Parallel Interface
On-Chip Output Buffer Rail-to-Rail Operation
Low Power Operation 1.75 mA max @ 3.3 V
Power-Down to 1
A max @ 25 C
APPLICATIONS
Portable Battery Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage and Current Sources
Programmable Attenuators
GENERAL DESCRIPTION
The AD7801 is a single, 8-bit, voltage out DAC that operates
from a single +2.7 V to +5.5 V supply. Its on-chip precision output
buffer allows the DAC output to swing rail to rail. The AD7801
has a parallel microprocessor and DSP compatible interface with
high speed registers and double buffered interface logic. Data is
loaded to the input register on the rising edge of
CS or WR.
Reference selection for the AD7801 can be either an internal
reference derived from the VDD or an external reference applied
at the REFIN pin. The output of the DAC can be cleared by
using the asynchronous
CLR input.
The low power consumption of this part makes it ideally suited
to portable battery operated equipment. The power consump-
tion is less than 5 mW at 3.3 V, reducing to less than 3
W in
power-down mode.
The AD7801 is available in a 20-lead SOIC and a 20-lead
TSSOP package.
PRODUCT HIGHLIGHTS
1. Low Power, Single Supply operation. This part operates
from a single +2.7 V to +5.5 V supply and consumes typically
5 mW at 3 V, making it ideal for battery powered applications.
2. The on-chip output buffer amplifier allows the output of the
DAC to swing rail to rail with a settling time of typically 1.2
s.
3. Internal or external reference capability.
4. High speed parallel interface.
5. Power-down capability. When powered down the DAC
consumes less than 1
A at 25°C.
6. Packaged in 20-lead SOIC and TSSOP packages.
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