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參數資料
| 型號： | AD7928BRU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 20-Lead TSSOP |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | MO-153AC, TSSOP-20 |
| 文件頁數： | 1/24頁 |
| 文件大小： | 607K |
| 代理商： | AD7928BRU |
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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. Trademarks and
registered trademarks are the property of their respective companies.
Tel: 781/329-4700 Fax: 781/326-8703
www.analog.comREV. A
AD7908/AD7918/AD7928
8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs
with Sequencer in 20-Lead TSSOP
FUNCTIONAL BLOCK DIAGRAM
V
IN
7
T/H
I/P
MUX
SEQUENCER
CONTROL LOGIC
8-/10-/12-BIT
SUCCESSIVE
APPROXIMATION
ADC
GND
SCLK
DOUT
DIN
CS
V
DRIVE
AV
DD
AD7908/AD7918/AD7928
REF
IN
V
IN
0
FEATURES
Fast Throughput Rate: 1 MSPS
Specified for AV
DD
of 2.7 V to 5.25 V
Low Power:
6.0 mW Max at 1 MSPS with 3 V Supply
13.5 mW Max at 1 MSPS with 5 V Supply
8 (Single-Ended) Inputs with Sequencer
Wide Input Bandwidth:
AD7928, 70 dB Min SINAD at 50 kHz Input Frequency
Flexible Power/Serial Clock Speed Management
No Pipeline Delays
High Speed Serial Interface SPI
/QSPI/
MICROWIRE/DSP Compatible
Shutdown Mode: 0.5 A Max
20-Lead TSSOP Package
GENERAL DESCRIPTION
The AD7908/AD7918/AD7928 are, respectively, 8-bit, 10-bit,
and 12-bit, high speed, low power, 8-channel, successive
approximation ADCs. The parts operate from a single 2.7 V
to 5.25 V power supply and feature throughput rates up to
1 MSPS. The parts contain a low noise, wide bandwidth track-
and-hold amplifier that can handle input frequencies in excess
of 8 MHz.
The conversion process and data acquisition are controlled using
CS
and the serial clock signal, allowing the device to easily inter-
face with microprocessors or DSPs. The input signal is sampled
on the falling edge of
CS
and conversion is also initiated at this
point. There are no pipeline delays associated with the part.
The AD7908/AD7918/AD7928 use advanced design techniques to
achieve very low power dissipation at maximum throughput rates.
At maximum throughput rates, the AD7908/AD7918/AD7928
consume 2 mA maximum with 3 V supplies; with 5 V supplies, the
current consumption is 2.7 mA maximum.
Through the configuration of the Control Register, the analog
input range for the part can be selected as 0 V to REF
IN
or 0 V to
2 REF
IN
, with either straight binary or twos complement out-
put coding. The AD7908/AD7918/AD7928 each feature eight
single-ended analog inputs with a channel sequencer to allow a
preprogrammed selection of channels to be converted sequentially.
The conversion time for the AD7908/AD7918/AD7928 is deter-
mined by the SCLK frequency, which is also used as the master
clock to control the conversion.
PRODUCT HIGHLIGHTS
1. High Throughput with Low Power Consumption.
The AD7908/AD7918/AD7928 offer up to 1 MSPS throughput
rates. At the maximum throughput rate with 3 V supplies, the
AD7908/AD7918/AD7928 dissipate just 6 mW of power
maximum.
2. Eight Single-Ended Inputs with a Channel Sequencer.
A sequence of channels can be selected, through which the
ADC will cycle and convert on.
3. Single-Supply Operation with V
DRIVE
Function.
The AD7908/AD7918/AD7928 operate from a single 2.7 V to
5.25 V supply. The V
DRIVE
function allows the serial interface
to connect directly to either 3 V or 5 V processor systems
independent of AV
DD
.
4. Flexible Power/Serial Clock Speed Management.
The conversion rate is determined by the serial clock, allowing
the conversion time to be reduced through the serial clock
speed increase. The parts also feature various shutdown
modes to maximize power efficiency at lower throughput rates.
Current consumption is 0.5 μA max when in full shutdown.
5. No Pipeline Delay.
The parts feature a standard successive approximation ADC
with accurate control of the sampling instant via a
CS
input
and once off conversion control.
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