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| 型號： | AD7812 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 350 kSPS, 10-Bit 4-/8-Channel Sampling ADCs(350kSPS八通道采樣A/D轉(zhuǎn)換器) |
| 中文描述： | 350 kSPS的，10位4-/8-Channel采樣ADC（350kSPS八通道采樣的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 215K |
| 代理商： | AD7812 |
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
AD7811/AD7812
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1998
+2.7 V to +5.5 V, 350 kSPS, 10-Bit
4-/8-Channel Sampling ADCs
FEATURES
10-Bit ADC with 2.3
m
s Conversion Time
The AD7811 has Four Single-Ended Inputs that
Can Be Configured as Three Pseudo Differential
Inputs with Respect to a Common, or as Two Inde-
pendent Pseudo Differential Channels
The AD7812 has Eight Single-Ended Inputs that Can
Be Configured as Seven Pseudo Differential Inputs
with Respect to a Common, or as Four Independent
Pseudo Differential Channels
Onboard Track and Hold
Onboard Reference 2.5 V
6
2.5%
Operating Supply Range: +2.7 V to +5.5 V
Specifications at 2.7 V–3.6 V and 5 V
6
10%
DSP-/Microcontroller-Compatible Serial Interface
High Speed Sampling and Automatic Power-Down Modes
Package Address Pin on the AD7811 and AD7812 Allows
Sharing of the Serial Bus in Multipackage Applications
Input Signal Range: 0 V to V
REF
Reference Input Range: 1.2 V to V
DD
GENERAL DESCRIPTION
The AD7811 and AD7812 are high speed, low power, 10-bit
A/D converters that operate from a single +2.7 V to +5.5 V
supply. The devices contain a 2.3
μ
s successive approximation
A/D converter, an on-chip track/hold amplifier, a 2.5 V on-chip
reference and a high speed serial interface that is compatible
with the serial interfaces of most DSPs (Digital Signal Proces-
sors) and microcontrollers. The user also has the option of using
an external reference by connecting it to the V
REF
pin and set-
ting the EXTREF bit in the control register. The V
REF
pin may
be tied to V
DD
. At slower throughput rates the power-down
mode may be used to automatically power down between
conversions.
The control registers of the AD7811 and AD7812 allow the
input channels to be configured as single-ended or pseudo
differential. The control register also features a software convert
start and a software power-down. Two of these devices can
share the same serial bus and may be individually addressed in
a multipackage application by hardwiring the device address pin.
The AD7811 is available in a small, 16-lead 0.3" wide, plastic
dual-in-line package (mini-DIP), in a 16-lead 0.15" wide, Small
Outline IC (SOIC) and in a 16-lead, Thin Shrink Small Out-
line Package (TSSOP). The AD7812 is available in a small,
20-lead 0.3" wide, plastic dual-in-line package (mini-DIP), in a
20-lead, Small Outline IC (SOIC) and in a 20-lead, Thin Shrink
Small Outline Package (TSSOP).
PRODUCT HIGHLIGHTS
1. Low Power, Single Supply Operation
Both the AD7811 and AD7812 operate from a single +2.7 V
to +5.5 V supply and typically consume only 10 mW of
power. The power dissipation can be significantly reduced at
lower throughput rates by using the automatic power-down
mode e.g., 315
μ
W @ 10 kSPS, V
DD
= 3 V—see Power vs.
Throughput.
2. 4-/8-Channel, 10-Bit ADC
The AD7811 and AD7812 have four and eight single-ended
input channels respectively. These inputs can be configured
as pseudo differential inputs by using the Control Register.
3. On-chip 2.5 V (
±
2.5%) reference circuit that is powered
down when using an external reference.
4. Hardware and Software Control
The AD7811 and AD7812 provide for both hardware and
software control of Convert Start and Power-Down.
FUNCTIONAL BLOCK DIAGRAMS
REV. A
CHARGE
REDISTRIBUTION
DAC
CLOCK
OSC
AD7811
CONVST
AGND
V
DD
/3
COMP
REF
IN
V
DD
DOUT
DIN
RFS
TFS
SCLK
DGND
A0
V
IN1
V
IN2
V
IN3
V
IN4
BUF
CONTROL
LOGIC
MUX
C
REF
SERIAL
PORT
1.23V
REF
CHARGE
REDISTRIBUTION
DAC
CLOCK
OSC
AD7812
AGND
REF
IN
V
DD
DOUT
DIN
RFS
TFS
SCLK
DGND
A0
BUF
CONTROL
LOGIC
MUX
C
REF
SERIAL
PORT
V
IN1
V
IN2
V
IN3
V
IN4
V
IN5
V
IN6
V
IN7
V
IN8
CONVST
V
DD
/3
COMP
1.23V
REF
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