16-Bit, 1 MSPS, Integrated Data
Acquisition Subsystem
Data Sheet
ADAQ7980/ADAQ7988
FEATURES
Easy to use
FUNCTIONAL BLOCK DIAGRAM
V+ REF REF_OUT
LDO_OUT VDD
Integrated data acquisition subsystem
All active components designed by Analog Devices, Inc.
On-board ADC driver and reference buffer
50% PCB area savings
PD_REF
PD_LDO
LDO
10µF
2.2µF
Includes critical passive components
SPI-/QSPI-/MICROWIRE™-/DSP-compatible serial interface
Daisy-chain multiple ADAQ7980/ADAQ7988 devices
Versatile supply configuration with 1.8 V/2.5 V/3 V/5 V
logic interface
VIO
20Ω
IN+
SDI
IN–
SCK
SDO
ADC
AMP_OUT
CNV
1.8nF
Pseudo differential ADC input structure
High performance
ADAQ7980/
ADAQ7988
16-bit resolution with no missing codes
Throughput: 1 MSPS (ADAQ7980) and 500 kSPS (ADAQ7988)
INL: 8 ppm typical and 20 ppm maximum
SNR: 91.5 dB typical at 10 kHz (unity gain)
THD: −105 dB at 10 kHz
Low input bias current: 470 nA typical
Low power dissipation
21 mW typical at 1 MSPS (ADAQ7980)
16.5 mW typical at 500 kSPS (ADAQ7988)
Flexible power-down modes
V–
ADCN
GND
PD_AMP
Figure 1.
The ADAQ7980/ADAQ7988 contain a high accuracy, low power,
16-bit SAR ADC, a low power, high bandwidth, high input
impedance ADC driver, a low power, stable reference buffer,
and an efficient power management block. Housed within a tiny,
5 mm × 4 mm LGA package, these systems simplify the design
process for data acquisition systems. The level of system integration
of the ADAQ7980/ADAQ7988 solves many design challenges,
while the devices still provide the flexibility of a configurable
ADC driver feedback loop to allow gain and/or common-mode
adjustments. A set of four device supplies provides optimal system
performance; however, single-supply operation is possible with
minimal impact on device operating specifications.
Dynamic power scaling
Small, 24-lead, 5 mm × 4 mm LGA package
Wide operating temperature range: −55°C to +125°C
APPLICATIONS
Automated test equipment (ATE)
Battery powered instrumentation
Communications
Data acquisition
Process control
Using the SDI input, the serial peripheral interface (SPI)-
compatible serial interface features the ability to daisy-chain
multiple devices on a single, 3-wire bus and provides an optional
busy indicator. The user interface is compatible with 1.8 V, 2.5 V,
3 V, or 5 V logic.
Medical instruments
Specified operation of these devices is from −55°C to +125°C.
GENERAL DESCRIPTION
Table 1. Integrated SAR ADC Subsystems
Type
500 kSPS
1000 kSPS
The ADAQ7980/ADAQ7988 are 16-bit analog-to-digital converter
(ADC) subsystems that integrate four common signal processing
and conditioning blocks into a system in package (SiP) design
that supports a variety of applications. These devices contain
the most critical passive components, eliminating many of the
design challenges associated with traditional signal chains that
use successive approximation register (SAR) ADCs. These passive
components are crucial to achieving the specified device
performance.
16-Bit
ADAQ7988
ADAQ7980
Rev. 0
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www.analog.com
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