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| 型號(hào)： | AD7490BRU-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 16CH 28-TSSOP T/R |
| 產(chǎn)品變化通告： | IDD Specification Change 17/Jun/2009 Product Discontinuance 27/Oct/2011 |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 12.5mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-TSSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 16 個(gè)單端，單極 |
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16-Channel, 1 MSPS, 12-Bit ADC
with Sequencer in 28-Lead TSSOP
Data Sheet
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
2002–2012 Analog Devices, Inc. All rights reserved.
FEATURES
Fast throughput rate: 1 MSPS
Specified for VDD of 2.7 V to 5.25 V
Low power at maximum throughput rates
5.4 mW maximum at 870 kSPS with 3 V supplies
12.5 mW maximum at 1 MSPS with 5 V supplies
16 (single-ended) inputs with sequencer
Wide input bandwidth
69.5 dB SNR at 50 kHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface, SPI/QSPI/MICROWIRE/
DSP compatible
Full shutdown mode: 0.5 A maximum
28-lead TSSOP and 32-lead LFCSP packages
FUNCTIONAL BLOCK DIAGRAM
REFIN
VIN0
VIN15
AGND
VDD
AD7490
INPUT
MUX
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
CONTROL
LOGIC
SEQUENCER
SCLK
DOUT
DIN
CS
VDRIVE
T/H
02691-
001
Figure 1.
GENERAL DESCRIPTION
The AD7490 is a 12-bit high speed, low power, 16-channel,
successive approximation ADC. The part operates from a single
2.7 V to 5.25 V power supply and features throughput rates up
to 1 MSPS. The part contains a low noise, wide bandwidth
track-and-hold amplifier that can handle input frequencies in
excess of 1 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 AD7490 uses advanced design techniques to achieve very
low power dissipation at high throughput rates. For maximum
throughput rates, the AD7490 consumes just 1.8 mA with 3 V
supplies, and 2.5 mA with 5 V supplies.
By setting the relevant bits in the control register, the analog
input range for the part can be selected to be a 0 V to REFIN
input or a 0 V to 2 × REFIN input, with either straight binary
or twos complement output coding. The AD7490 features 16
single-ended analog inputs with a channel sequencer to allow a
preprogrammed selection of channels to be converted sequen-
tially. The conversion time is determined by the SCLK
frequency because this is also used as the master clock to
control the conversion.
The AD7490 is available in a 32-lead LFCSP and a 28-lead
TSSOP package.
PRODUCT HIGHLIGHTS
1. The AD7490 offers up to 1 MSPS throughput rates. At
maximum throughput with 3 V supplies, the AD7490
dissipates just 5.4 mW of power.
2. A sequence of channels can be selected, through which the
AD7490 cycles and converts.
3. The AD7490 operates from a single 2.7 V to 5.25 V supply.
The VDRIVE function allows the serial interface to connect
directly to either 3 V or 5 V processor systems independent
of VDD.
4. The conversion rate is determined by the serial clock,
allowing the conversion time to be reduced through the
serial clock speed increase. The part also features various
shutdown modes to maximize power efficiency at lower
throughput rates. Power consumption is 0.5 A, maximum,
when in full shutdown.
5. The part features 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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