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參數資料
型號: AD7924BRU
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 4-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 16-Lead TSSOP
中文描述: 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
封裝: MO-153AB, TSSOP-16
文件頁數: 1/24頁
文件大小: 411K
代理商: AD7924BRU
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.
Tel: 781/329-4700
Analog Devices, Inc., 2002
REV. 0
AD7904/AD7914/AD7924
4-Channel, 1 MSPS, 8-/10-/12-Bit ADCs
with Sequencer in 16-Lead TSSOP
FUNCTIONAL BLOCK DIAGRAM
V
IN
3
T/H
I/P
MUX
SEQUENCER
CONTROL LOGIC
8-/10-/12-BIT
SUCCESSIVE
APPROXIMATION
ADC
GND
SCLK
DOUT
DIN
CS
V
DRIVE
V
DD
AD7904/AD7914/AD7924
REF
IN
V
IN
0
FEATURES
Fast Throughput Rate: 1 MSPS
Specified for V
DD
of 2.7 V to 5.25 V
Low Power:
6 mW max at 1 MSPS with 3 V Supplies
13.5 mW max at 1 MSPS with 5 V Supplies
4 (Single-Ended) Inputs with Sequencer
Wide Input Bandwidth:
AD7924, 70 dB SNR at 50 kHz Input Frequency
Flexible Power/Serial Clock Speed Management
No Pipeline Delays
High Speed Serial Interface SPI
TM
/QSPI
TM
/
MICROWIRE
TM
/DSP Compatible
Shutdown Mode: 0.5 A Max
16-Lead TSSOP Package
GENERAL DESCRIPTION
The AD7904/AD7914/AD7924 are respectively, 8-bit, 10-bit,
and 12-bit, high speed, low power, 4-channel, successive-approxi-
mation 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/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 interface 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 AD7904/AD7914/AD7924 use advanced design techniques to
achieve very low power dissipation at maximum throughput rates.
At maximum throughput rates, the AD7904/AD7914/AD7924
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
output coding. The AD7904/AD7914/AD7924 each feature four
single-ended analog inputs with a channel sequencer to allow a
preprogrammed selection of channels to be converted sequentially.
The conversion time for the AD7904/AD7914/AD7924 is deter-
mined by the SCLK frequency, as this is also used as the master
clock to control the conversion.
PRODUCT HIGHLIGHTS
1. High Throughput with Low Power Consumption.
The AD7904/AD7914/AD7924 offer up to 1 MSPS through-
put rates. At the maximum throughput rate with 3 V sup`plies,
the AD7904/AD7914/AD7924 dissipate just 6 mW of
power maximum.
2. Four Single-Ended Inputs with a Channel Sequencer.
A consecutive sequence of channels can be selected, through
which the ADC will cycle and convert on.
3. Single-Supply Operation with V
DRIVE
Function.
The AD7904/AD7914/AD7924 operate from a single 2.7 V
to 5.25 V supply. The V
DRIVE
function allows the serial inter-
face to connect directly to either 3 V or 5 V processor systems
independent of V
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
μ
A 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.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
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