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Analog Devices Semiconductor Electronic Components Datasheet

AD4001 Datasheet

Differential SAR ADCs

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Data Sheet
16-Bit, 2 MSPS/1 MSPS,
Precision, Differential SAR ADCs
AD4001/AD4005
FEATURES
Throughput: 2 MSPS/1 MSPS options
INL: ±0.4 LSB maximum
Guaranteed 16-bit no missing codes
Low power
9.5 mW at 2 MSPS, 4.9 mW at 1 MSPS (VDD only)
80 μW at 10 kSPS, 16 mW at 2 MSPS (total)
SNR: 96.2 dB typical at 1 kHz, VREF = 5 V; 95.5 dB typical at 100 kHz
THD: −123 dB typical at 1 kHz, VREF = 5 V; −99 dB typical at 100 kHz
Ease of use features reduce system power and complexity
Input overvoltage clamp circuit
Reduced nonlinear input charge kickback
High-Z mode
Long acquisition phase
Input span compression
Fast conversion time allows low SPI clock rates
SPI-programmable modes, read/write capability, status word
Differential analog input range: ±VREF
0 V to VREF with VREF from 2.4 V to 5.1 V
Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface
SAR architecture: no latency/pipeline delay, valid first conversion
First accurate conversion
Guaranteed operation: −40°C to +125°C
SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface
Ability to daisy-chain multiple ADCs and busy indicator
10-lead packages: 3 mm × 3 mm LFCSP, 3 mm × 4.90 mm MSOP
APPLICATIONS
Automatic test equipment
Machine automation
Medical equipment
Battery-powered equipment
Precision data acquisition systems
GENERAL DESCRIPTION
The AD4001/AD4005 are low noise, low power, high speed, 16-bit,
precision successive approximation register (SAR) analog-to-digital
converters (ADCs). The AD4001 offers a 2 MSPS throughput, and
the AD4005 offers a 1 MSPS throughput. They incorporate ease
of use features that reduce signal chain power consumption,
reduce signal chain complexity, and enable higher channel density.
The high-Z mode, coupled with a long acquisition phase,
eliminates the need for a dedicated high power, high speed
ADC driver, thus broadening the range of low power precision
amplifiers that can drive these ADCs directly, while still achieving
optimum performance. The input span compression feature
enables the ADC driver amplifier and the ADC to operate off
common supply rails without the need for a negative supply while
preserving the full ADC code range. The low serial peripheral
interface (SPI) clock rate requirement reduces the digital
input/output power consumption, broadens processor options,
and simplifies the task of sending data across digital isolation.
Operating from a 1.8 V supply, the AD4001/AD4005 have a ±VREF
fully differential input range with VREF ranging from 2.4 V to 5.1 V.
The AD4001 consumes only 16 mW at 2 MSPS with a minimum
SCK rate of 70 MHz in turbo mode, and the AD4005 consumes
only 8 mW at 1 MSPS. The AD4001/AD4005 both achieve
±0.4 LSB integral nonlinearity error (INL) maximum, guaranteed
no missing codes at 16 bits with 96.2 dB typical signal-to-noise
ratio (SNR) for 1 kHz inputs. The reference voltage is applied
externally and can be set independently of the supply voltage.
The SPI-compatible, versatile serial interface features seven
different modes including the ability, using the SDI input, to
daisy-chain several ADCs on a single 3-wire bus, and provides an
optional busy indicator. The AD4001/AD4005 are compatible with
1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.
The AD4001/AD4005 are available in a 10-lead MSOP or LFCSP
with operation specified from −40°C to +125°C. The devices are
pin compatible with the 18-bit, 2 MSPS AD4003 (see Table 8).
FUNCTIONAL BLOCK DIAGRAM
2.4V TO 5.1V
10µF
1.8V
REF VDD
VREF
VREF/2
0
VREF
VREF/2
0
HIGH-Z
MODE
AD4001/
AD4005
IN+
16-BIT
SAR ADC
IN–
CLAMP
SPAN
COMPRESSION
TURBO
MODE
SERIAL
INTERFACE
STATUS
BITS
GND
VIO 1.8V TO 5V
SDI
SCK
SDO
CNV
3-WIRE OR 4-WIRE
SPI INTERFACE
(DAISY CHAIN, CS)
Figure 1.
Rev. B
Document Feedback
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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.
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Tel: 781.329.4700
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Technical Support
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Analog Devices Semiconductor Electronic Components Datasheet

AD4001 Datasheet

Differential SAR ADCs

No Preview Available !

AD4001/AD4005
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 4
Timing Specifications .................................................................. 7
Absolute Maximum Ratings............................................................ 9
Thermal Resistance ...................................................................... 9
ESD Caution.................................................................................. 9
Pin Configurations and Function Descriptions ......................... 10
Typical Performance Characteristics ........................................... 11
Terminology .................................................................................... 16
Theory of Operation ...................................................................... 17
Circuit Information.................................................................... 17
Converter Operation.................................................................. 18
Transfer Functions...................................................................... 18
Applications Information .............................................................. 19
Typical Application Diagrams .................................................. 19
Analog Inputs ............................................................................. 20
Driver Amplifier Choice ........................................................... 22
Ease of Drive Features ............................................................... 23
Voltage Reference Input ............................................................ 24
Power Supply............................................................................... 24
Digital Interface.......................................................................... 25
Register Read/Write Functionality........................................... 26
Status Word ................................................................................. 28
CS Mode, 3-Wire Turbo Mode................................................. 29
CS Mode, 3-Wire Without Busy Indicator ............................. 30
CS Mode, 3-Wire with Busy Indicator .................................... 31
CS Mode, 4-Wire Turbo Mode................................................. 32
CS Mode, 4-Wire Without Busy Indicator ............................. 33
CS Mode, 4-Wire with Busy Indicator .................................... 34
Daisy-Chain Mode ..................................................................... 35
Layout Guidelines....................................................................... 36
Evaluating the AD4001/AD4005 Performance.......................... 36
Outline Dimensions ....................................................................... 37
Ordering Guide .......................................................................... 37
REVISION HISTORY
8/2017—Rev. A to Rev. B
Changes to General Description Section ...................................... 1
Changes to Table 1............................................................................ 6
Changes to Endnote 3, Table 2........................................................ 7
Changes to Table 4............................................................................ 8
Change to Pin 3 Description and Pin 4 Description, Table 7... 10
Reorganized Typical Performance Characteristics Section ...... 13
Changes to Figure 17, Figure 19, and Figure 21 ......................... 13
Added Figure 23; Renumbered Sequentially .............................. 14
Changes to Figure 27...................................................................... 15
Changes to Circuit Information Section and Table 8 ................ 17
Changes to Endnote 1 and Endnote 2, Table 9 ........................... 18
Changes to Figure 37 Caption and RC Filter Values Section ... 21
Changes to High Frequency Input Signals Section, Figure 38
Caption, and Figure 39 Caption ................................................... 22
Added Multiplexed Applications Section and Figure 40........... 22
Changes to Figure 41 and Figure 42 Caption ............................. 23
Changes to Figure 43, Figure 44 Caption, Figure 45, and Voltage
Reference Input Section................................................................. 24
Changes to Power Supply Section, Figure 46, Figure 47, Digital
Interface Section, and Table 11 ..................................................... 25
Changes to CS Mode, 3-Wire Turbo Mode Section................... 29
Changes to CS Mode, 3-Wire with Busy Induction Section and
Figure 56 .......................................................................................... 31
Changes to CS Mode, 4-Wire Turbo Mode Section and
Figure 58 .......................................................................................... 32
Changes to CS Mode, 4-Wire with Busy Indicator Section and
Figure 62 .......................................................................................... 34
4/2017—Rev. 0 to Rev. A
Added AD4005 ...................................................................Universal
Changes to Title, Features Section, General Description Section,
and Figure 1........................................................................................1
Changes to Table 1.............................................................................3
Changes to Table 2.............................................................................6
Changes to Table 4.............................................................................7
Changes to Figure 19 Caption and Figure 21 ............................. 12
Changes to Figure 24...................................................................... 13
Added Figure 25; Renumbered Sequentially .............................. 13
Changes to Circuit Information Section and Table 8 ................ 16
Changes to RC Filter Values Section............................................ 20
Changes to High Frequency Input Signals Section.................... 21
Changes to High-Z Mode Section and Figure 41....................... 22
Changes to Long Acquisition Phase Section .............................. 23
Changes to Digital Interface Section and Register Read/Write
Functionality Section ..................................................................... 24
Changes to CS Mode, 3-Wire Turbo Mode Section .................. 27
Changes to CS Mode, 4-Wire Turbo Mode Section .................. 30
Rev. B | Page 2 of 37


Part Number AD4001
Description Differential SAR ADCs
Maker Analog Devices
Total Page 30 Pages
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