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參數(shù)資料
| 型號： | AD7934 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer |
| 中文描述： | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | TSSOP-28 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大?。?/td> | 1253K |
| 代理商： | AD7934 |
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4-Channel, 1.5 MSPS, 12-Bit and 10-Bit
Parallel ADCs with a Sequencer
Preliminary Technical Data
AD7933/AD7934
FEATURES
Fast throughput rate: 1.5 MSPS
Specified for V
DD
of 2.7 V to 5.25 V
Low power
8 mW max at 1.5 MSPS with 3 V supplies
16 mW max at 1.5 MSPS with 5 V supplies
4 analog input channels with a sequencer
Software configurable analog inputs
4-channel single-ended inputs
2-channel fully differential inputs
2-channel pseudo-differential inputs
Accurate on-chip 2.5 V reference
Wide input bandwidth
70 dB SNR at 50 kHz input frequency
No pipeline delays
High speed parallel interface—word/byte modes
Full shutdown mode: 1 μA max
28 lead TSSOP package
FUNCTIONAL BLOCK DIAGRAM
0
V
IN
3
T/H
PARALLEL INTERFACE/CONTROL REGISTER
SEQUENCER
12-/10-BIT
SAR ADC
AND
CONTROL
I/P
MUX
2.5V
VREF
DB0
DB11
V
DRIVE
V
DD
AD7933/AD7934
V
IN
0
AGND
V
REFIN/
V
REFOUT
CLKIN
BUSY
CONVST
CS
DGND
RD WR W/B
Figure 1.
GENERAL DESCRIPTION
The AD7933/AD7934 are 12-bit and 10-bit, high speed, low
power, successive approximation (SAR) ADCs. The parts
operate from a single 2.7 V to 5.25 V power supply and feature
throughput rates to 1.5 MSPS. The parts contain a low noise,
wide bandwidth, differential track-and-hold amplifier that can
handle input frequencies up to 20 MHz.
The AD7933/AD7934 feature 4 analog input channels with a
channel sequencer to allow a consecutive sequence of channels
to be converted on. These parts can accept either single-ended,
fully differential, or pseudo-differential analog inputs.
The conversion process and data acquisition are controlled
using standard control inputs, which allows for easy interfacing
to microprocessors and DSPs. The input signal is sampled on
the falling edge of CONVST and the conversion is also initiated
at this point.
The AD7933/AD7934 has an accurate on-chip 2.5 V reference
that can be used as the reference source for the analog-to-digital
conversion. Alternatively, this pin can be overdriven to provide
an external reference.
These parts use advanced design techniques to achieve very low
power dissipation at high throughput rates. They also feature
flexible power management options. An on-chip control register
allows the user to set up different operating conditions,
including analog input range and configuration, output coding,
power management, and channel sequencing.
PRODUCT HIGHLIGHTS
1.
High throughput with low power consumption.
2.
Four analog inputs with a channel sequencer.
3.
Accurate on-chip 2.5 V reference.
4.
Software configurable analog inputs. Single-ended, pseudo-
differential, or fully differential analog inputs that are
software selectable.
5.
Single-supply operation with V
DRIVE
function. The V
DRIVE
function allows the parallel interface to connect directly to
3 V, or 5 V processor systems independent of V
DD
.
6.
No pipeline delay.
7.
Accurate control of the sampling instant via a CONVST
input and once off conversion control.
PrG
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.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
2004 Analog Devices, Inc. All rights reserved.
www.analog.com
Rev.
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