AD7988-1 Datasheet, PDF (1/24 Pages) Analog Devices – 16-Bit Lower Power

Data Sheet
16-Bit Lower Power
PulSAR ADCs in MSOP/LFCSP (QFN)
AD7988-1/AD7988-5
FEATURES
Low power dissipation
AD7988-5: 3.5 mW @ 500 kSPS
AD7988-1: 700 µW @ 100 kSPS
16-bit resolution with no missing codes
Throughput: 100 kSPS/500 kSPS options
INL: ±0.6 LSB typical, ±1.25 LSB maximum
SINAD: 91.5 dB @ 10 kHz
THD: −114 dB @ 10 kHz
Pseudo differential analog input range
0 V to VREF with VREF from 2.5 V to 5.5 V
Any input range and easy to drive with the ADA4841-1
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V
logic interface
SPI-/QSPI-/MICROWIRE™-/DSP-compatible serial interface
Daisy-chain multiple ADCs
10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP (QFN),
same space as SOT-23
Wide operating temperature range: −40°C to +125°C
APPLICATIONS
Battery-powered equipment
Low power data acquisition systems
Portable medical instruments
ATE equipment
Data acquisitions
Communications
GENERAL DESCRIPTION
The AD7988-1/AD7988-5 are 16-bit, successive approximation,
analog-to-digital converters (ADC) that operate from a single
power supply, VDD. The AD7988-1 offers a 100 kSPS throughput,
and the AD7988-5 offers a 500 kSPS throughput. They are low
power, 16-bit sampling ADCs with a versatile serial interface
port. On the CNV rising edge, they sample an analog input,
IN+, between 0 V to VREF with respect to a ground sense, IN−.
The reference voltage, REF, is applied externally and can be set
independent of the supply voltage, VDD.
The SPI-compatible serial interface also features the ability to
daisy-chain several ADCs on a single 3-wire bus using the SDI
input. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using
the separate supply, VIO.
The AD7988-1/AD7988-5 generics are housed in a 10-lead
MSOP or a 10-lead LFCSP (QFN) with operation specified
from −40°C to +125°C.
Table 1. MSOP, LFCSP (QFN) 14-/16-/18-Bit PulSAR® ADCs
400 kSPS to ≥1000
Bits 100 kSPS 250 kSPS 500 kSPS
kSPS
ADC Driver
18 ¹
AD7691² AD7690²
AD7982² ADA4941-1
AD7984² ADA4841-1
16¹ AD7684 AD7687² AD7688²
AD7693²
ADA4941-1
ADA4841-1
16³ AD7680 AD7685² AD7686²
AD7683 AD7694 AD7988-5²
AD7988-1²
AD7980²
ADA4841-1
ADA4841-1
ADA4841-1
14³ AD7940 AD7942² AD7946²
ADA4841-1
1 _{True differential.}
2 _{Pin-for-pin compatible.}
3 _{Pseudo differential.}
TYPICAL APPLICATION DIAGRAM
2.5V TO 5V 2.5V
0V TO V_REF
REF VDD VIO
SDI
IN+ _AD7988-1/
IN–
AD7988-5
SCK
SDO
GND
CNV
1.8V TO 5.5V
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
Figure 1.
Rev. B
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