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AD7274BRMZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
3 MSPS,10-/12-Bit
ADCs in 8-Lead TSOT
AD7273/AD7274
Rev. 0
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 www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Throughput rate: 3 MSPS
Specified for V
DD
of 2.35 V to 3.6 V
Power consumption
11.4 mW at 3 MSPS with 3 V supplies
Wide input bandwidth
70 dB SNR at 1 MHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
Temperature range: −40°C to +125°C
Power-down mode: 0.1 μA typ
8-lead TSOT package
8-lead MSOP package
GENERAL DESCRIPTION
The AD7273/AD7274 are 10-/12-bit, high speed, low power,
successive approximation ADCs, respectively. The parts operate
from a single 2.35 V to 3.6 V power supply and feature
throughput rates of up to 3 MSPS. Each part contains a low
noise, wide bandwidth track-and-hold amplifier that can handle
input frequencies in excess of 55 MHz.
The conversion process and data acquisition are controlled
using
CS
and the serial clock, allowing the devices to interface
with microprocessors or DSPs. The input signal is sampled on
the falling edge of
CS
, and the conversion is also initiated at this
point. The conversion rate is determined by the SCLK. There
are no pipeline delays associated with these parts.
The AD7273/AD7274 use advanced design techniques to
achieve very low power dissipation at high throughput rates.
The reference for the parts is applied externally and can be in
the range of 1.4 V to V
DD
. This allows the widest dynamic input
range to the ADC.
FUNCTIONAL BLOCK DIAGRAM
T/H
CONTROL
LOGIC
10-/12-BIT
SUCCESSIVE
APPROXIMATION
ADC
DGND
V
DD
AD7273/AD7274
V
IN
AGND
SCLK
SDATA
CS
V
REF
04973-001
Figure 1.
Table 1.
Part Number Resolution Package
AD7273
1
10 8-lead MSOP 8-Lead TSOT
AD7274
1
12 8-lead MSOP 8-Lead TSOT
AD7276 12 8-lead MSOP 6-Lead TSOT
AD7277 10 8-lead MSOP 6-Lead TSOT
AD7278 8 8-lead MSOP 6-Lead TSOT
1
Parts contain external reference pin.
PRODUCT HIGHLIGHTS
1. 3 MSPS ADCs in an 8-lead TSOT package.
2. High throughput with low power consumption.
3. Flexible power/serial clock speed management.
Allows maximum power efficiency at low throughput rates.
4. Reference can be driven up to the power supply.
5. No pipeline delay.
6. The parts feature a standard successive approximation ADC
with accurate control of the sampling instant via a
CS
input
and once-off conversion control.
AD7273/AD7274
Rev. 0 | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
AD7274 Specifications................................................................. 3
AD7273 Specifications................................................................. 5
Timing Specifications .................................................................. 7
Timing Examples.......................................................................... 8
Absolute Maximum Ratings............................................................ 9
ESD Caution.................................................................................. 9
Pin Configurations and Function Descriptions ......................... 10
Typical Performance Characteristics ........................................... 11
Ter mi no lo g y .................................................................................... 14
Circuit Information........................................................................ 15
Converter Operation.................................................................. 15
ADC Transfer Function............................................................. 15
Typical Connection Diagram ....................................................... 16
Analog Input ............................................................................... 16
Digital Inputs .............................................................................. 16
Modes of Operation ....................................................................... 17
Normal Mode.............................................................................. 17
Partial Power-Down Mode ....................................................... 17
Full Power-Down Mode ............................................................ 17
Power-Up Times......................................................................... 18
Power vs. Throughput Rate....................................................... 20
Serial Interface ................................................................................ 21
Microprocessor Interfacing....................................................... 23
Application Hints ........................................................................... 24
Grounding and Layout .............................................................. 24
Evaluating the AD7273/AD7274 Performance......................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
REVISION HISTORY
9/05—Revision 0: Initial Version
AD7273/AD7274
Rev. 0 | Page 3 of 28
SPECIFICATIONS
AD7274 SPECIFICATIONS
V
DD
= 2.35 V to 3.6 V, V
REF
= 2.35 V to V
DD
, f
SCLK
= 48 MHz, f
SAMPLE
= 3 MSPS, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter B Grade
1
Unit
2
Test Conditions/Comments
DYNAMIC PERFORMANCE f
IN
= 1 MHz sine wave
Signal-to-Noise + Distortion (SINAD)
3
68 dB min
Signal-to-Noise Ratio (SNR) 69.5 dB min
Total Harmonic Distortion (THD)
3
−73 dB max
−78 dB typ
Peak Harmonic or Spurious Noise (SFDR)
3
−80 dB typ
Intermodulation Distortion (IMD)
Second-Order Terms −82 dB typ fa = 1 MHz, fb = 0.97 MHz
Third-Order Terms −82 dB typ fa = 1 MHz, fb = 0.97 MHz
Aperture Delay 5 ns typ
Aperture Jitter 18 ps typ
Full Power Bandwidth 55 MHz typ @ 3 dB
8 MHz typ @ 0.1 dB
Power Supply Rejection Ratio (PSRR) 82 dB typ
DC ACCURACY
Resolution 12 Bits
Integral Nonlinearity
3
±1 LSB max
Differential Nonlinearity
3
±1 LSB max Guaranteed no missed codes to 12 bits
Offset Error
3
±3 LSB max
Gain Error
3
±3.5 LSB max
Total Unadjusted Error (TUE)
3
±3.5 LSB max
ANALOG INPUT
Input Voltage Range 0 to V
REF
V
DC Leakage Current ±1 μA max −40°C to +85°C
±5.5 μA max 85°C to 125°C
Input Capacitance 42 pF typ When in track
10 pF typ When in hold
REFERENCE INPUT
V
REF
Input Voltage Range 1.4 to V
DD
V min/V max
DC leakage Current ±1 μA max
Input Capacitance 20 pF typ
Input Impedance 32 Ω typ
LOGIC INPUTS
Input High Voltage, V
INH
1.7 V min 2.35 V ≤ V
DD
≤ 2.7 V
2 V min 2.7 V < V
DD
≤ 3.6 V
Input Low Voltage, V
INL
0.7 V max 2.35 V ≤ V
DD
< 2.7 V
0.8 V max 2.7 V ≤ V
DD
≤ 3.6 V
Input Current, I
IN
±1 μA max Typically 10 nA, V
IN
= 0 V or V
DD
Input Capacitance, C
IN
4
2 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
V
DD
− 0.2 V min I
SOURCE
= 200 μA, V
DD
= 2.35 V to 3.6 V
Output Low Voltage, V
OL
0.2 V max I
SINK
= 200 μA
Floating-State Leakage Current ±2.5 μA max
Floating-State Output Capacitance
4
4.5 pF max
Output Coding Straight (natural) binary
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

AD7274BRMZ

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Buy AD7274BRMZ
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12Bit 3MSPS SAR IC
Lifecycle:
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