AD4001 Datasheet, PDF (1/34 Pages) Analog Devices – 16-Bit, 2 MSPS, Precision SAR, Differential ADC

Data Sheet
16-Bit, 2 MSPS,
Precision SAR, Differential ADC
AD4001
FEATURES
GENERAL DESCRIPTION
Throughput: 2 MSPS maximum
INL: ±0.4 LSB maximum
Guaranteed 16-bit no missing codes
Low power
9.5 mW at 2 MSPS (VDD only)
80 μW at 10 kSPS
16 mW at 2 MSPS (total)
SNR
96.2 dB typical at 1 kHz
95.5 dB typical at 100 kHz
THD
−123 dB typical at 1 kHz
−99 dB typical at 100 kHz
Ease of use features reduce system power and complexity
Input overvoltage clamp circuit
Reduced nonlinear input charge kickback
The AD4001 is a low noise, low power, high speed, 16-bit, 2 MSPS,
precision successive approximation register (SAR) analog-to-
digital converter (ADC). It incorporates ease of use features that
lower the signal chain power, 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 this ADC 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.
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 between 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
Guaranteed operation: −40°C to 125°C
Serial interface SPI-/QSPI-/MICROWIRE-/DSP-compatible
Ability to daisy-chain multiple ADCs and busy indicator
10-lead, 3 mm × 3 mm LFCSP and 10-lead, 3 mm × 4.90 mm MSOP
APPLICATIONS
Automatic test equipment
Machine automation
Medical equipment
Battery-powered equipment
Operating from a 1.8 V supply, the AD4001 has 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 achieves ±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). 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 is compatible with 1.8 V,
2.5 V, 3 V, and 5 V logic, using the separate VIO supply.
The AD4001 is available in a 10-lead MSOP or a 10-lead LFCSP
with operation specified from −40°C to +125°C. The device is
pin compatible with the AD4003 18-bit, 2 MSPS, precision SAR
differential ADC.
Precision data acquisition systems
FUNCTIONAL BLOCK DIAGRAM
2.5V TO 5V
10µF
1.8V
V_REF
V_REF/2
0
V_REF
V_REF/2
0
REF
VDD
HIGH-Z
MODE
AD4001
IN+
16-BIT
SAR ADC
IN– _{CLAMPCOMPSRPEASNSION}
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. 0
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