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參數(shù)資料
| 型號(hào)： | AD7485BSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT SAR 1MSPS 48-LQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 80mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 1 個(gè)單端，單極 |
REV.
a
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 that
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: 781/329-4700
www.analog.com
Fax:
Analog Devices, Inc.,
AD7485
1 MSPS, Serial 14-Bit SAR ADC
FEATURES
Fast Throughput Rate: 1 MSPS
Wide Input Bandwidth: 40 MHz
Excellent DC Accuracy Performance
Flexible Serial Interface
Low Power:
80 mW (Full Power) and 3 mW (NAP Mode)
STANDBY Mode: 2
A Max
Single 5 V Supply Operation
Internal 2.5 V Reference
Full-Scale Overrange Indication
FUNCTIONAL BLOCK DIAGRAM
2.5 V
REFERENCE
BUF
T/H
AVDD AGND
CBIAS DVDD
DGND
REFSEL
REFOUT
REFIN
VIN
14-BIT
ALGORITHMIC
SAR
NAP
STBY
RESET
CONVST
MCLK
TFS
SCO
CONTROL
LOGIC AND I/O
REGISTERS
SMODE
AD7485
VDRIVE
SDO
GENERAL DESCRIPTION
The AD7485 is a 14-bit, high speed, low power, successive-
approximation ADC. The part features a serial interface with
throughput rates up to 1 MSPS. The part contains a low noise,
wide bandwidth track-and-hold that can handle input frequencies
in excess of 40 MHz.
The conversion process is a proprietary algorithmic successive-
approximation technique. The input signal is sampled and a
conversion is initiated on the falling edge of the
CONVST signal.
The conversion process is controlled by an external master
clock. Interfacing is via standard serial signal lines, making the
part directly compatible with microcontrollers and DSPs.
The AD7485 provides excellent ac and dc performance specifi-
cations. Factory trimming ensures high dc accuracy resulting in
very low INL, DNL, offset, and gain errors.
The part uses advanced design techniques to achieve very low
power dissipation at high throughput rates. Power consumption
in the normal mode of operation is 80 mW. There are two power-
saving modes: a NAP mode keeps reference circuitry alive for
quick power-up and consumes 3 mW, while a STANDBY mode
reduces power consumption to a mere 10
W.
The AD7485 features an on-board 2.5 V reference, but the part can
also accommodate an externally provided 2.5 V reference source.
The nominal analog input range is 0 V to 2.5 V.
The AD7485 also provides the user with overrange indication via a
fifteenth bit. If the analog input range strays outside the 0 V to
2.5 V input range, the fifteenth data bit is set to a logic high.
The AD7485 is powered from a 4.75 V to 5.25 V supply. The
part also provides a VDRIVE pin that allows the user to set the
voltage levels for the digital interface lines. The range for this
VDRIVE pin is from 2.7 V to 5.25 V. The part is housed in a
48-lead LQFP package and is specified over a –40
°C to +85°C
temperature range.
A
781/461-3113
2010
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