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16-Bit, 2 MSPS/1 MSPS,
Precision, Differential SAR ADCs
Data Sheet
AD4001/AD4005
Rev. B
Document Feedback
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
©2017 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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 = 5V; 95.5 dB typical at 100 kHz
THD: −123 dB typical at 1 kHz,VREF = 5V; −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
GND
IN+
IN–
SDI
SCK
SDO
CNV
AD4001/
AD4005
16-BIT
SAR ADC
SERIAL
INTERFACE
VIO
REF
VDD
VREF
0
VREF
0
VREF/2
VREF/2
HIGH-Z
MODE
CLAMP
SPAN
COMPRESSION
TURBO
MODE
STATUS
BITS
2.4V TO 5.1V
1.8V
10µF
1.8V TO 5V
3-WIRE OR 4-WIRE
SPI INTERFACE
(DAISY CHAIN, CS)
Figure 1.


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