AD7989-1_17 Datasheet, PDF (1/24 Pages) Analog Devices – PulSAR ADCs in MSOP/LFCSP

Data Sheet
18-Bit, 100 kSPS/500 kSPS
PulSAR ADCs in MSOP/LFCSP
AD7989-1/AD7989-5
FEATURES
Low power dissipation
AD7989-1
400 μW at 100 kSPS typical (VDD only)
700 μW at 100 kSPS typical (total)
AD7989-5
2 mW at 500 kSPS typical (VDD only)
3.5 mW at 500 kSPS typical (total)
18-bit resolution with no missing codes
Throughput
AD7989-1
100 kSPS
AD7989-5
500 kSPS
INL: ±1 LSB typical, 2 LSB maximum
SNR: 98 dB at 1 kHz, VREF = 5 V typical
SINAD: 97 dB at 1 kHz typical
THD: −120 dB at 10 kHz typical
Dynamic range: 99 dB at VREF = 5 V typical
True differential analog input voltage range: ±VREF
0 V to VREF with VREF between 2.4 V and 5.1 V
No pipeline delay
Single-supply 2.5 V operation with 1.8 V, 2.5 V, 3 V, and 5 V
logic interface
Proprietary serial interface SPI-/QSPI™-/MICROWIRE™-/
DSP-compatible¹
Ability to daisy-chain multiple ADCs
10-lead MSOP and 3 mm × 3 mm 10-Lead LFCSP
APPLICATIONS
Battery-powered equipment
Data acquisition systems
Medical instruments
Seismic data acquisition systems
GENERAL DESCRIPTION
The AD7989-1/AD7989-5 are 18-bit, successive approximation,
analog-to-digital converters (ADCs) that operate from a single
power supply, VDD. The AD7989-1/AD7989-5 contain a low
power, high speed, 18-bit sampling ADC and a versatile serial
interface port. On the CNV rising edge, the AD7989-1/AD7989-5
sample the voltage difference between the IN+ and IN− pins.
The voltages on these pins typically swing in opposite phases
between 0 V and VREF. The reference voltage, VREF, is applied
externally and can be set independent of the supply voltage,
VDD. Its power scales linearly with throughput.
The AD7989-1/AD7989-5 are serial peripheral interface (SPI)-
compatible, which features the ability, using the SDI/CS input,
to daisy-chain several ADCs on a single 3-wire bus. The
AD7989-1/AD7989-5 are compatible with 1.8 V, 2.5 V, 3 V, and
5 V logic, using the separate VIO supply.
The AD7989-1/AD7989-5 are available in a 10-lead MSOP or a
10-lead LFCSP with operation specified from −40°C to +85°C.
Table 1. MSOP and LFCSP 14-/16-/18-Bit PulSAR® ADCs
Bits 100 kSPS 250 kSPS 400 kSPS to 500 kSPS ≥1000 kSPS
18¹ AD7989-1² AD7691² AD7690²
AD7982²
AD7989-5²
AD7984²
16¹ AD7684
AD7687²
AD7688²
AD7693²
AD7915²
AD7916²
16³ AD7680
AD7683
AD7685²
AD7694
AD7686²
AD7988-5²
AD7980²
AD7983²
AD7988-1²
14³ AD7940
AD7942² AD7946²
1 _{True differential.}
2 _{Pin for pin compatible.}
3 _{Pseudo differential.}
TYPICAL APPLICATIONS CIRCUIT
2.5V TO 5V 2.5V
±10V, ±5V, ..
ADA4941-1
REF VDD ^VIO
IN+
SDI/CS
AD7989-1/
AD7989-5
IN–
SCK
SDO
GND _CNV
1.8V TO 5.5V
3- OR 4-WIRE
INTERFACE
(SPI, CS,
DAISY CHAIN)
1 _{Protected by U.S. Patent 6,703,961.}
Figure 1.
Rev. B
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