AD7989-1 18-Bit, 100 kSPS PulSAR ADCs in MSOP/LFCSP _ BDTIC a Leading Distributor in China

AD7989-1 18-Bit, 100 kSPS PulSAR ADCs in MSOP/LFCSP

The AD7989-1/AD7989-5 are 18-bit, successive approximation, analog-to-digital converters (ADC) that operate from a single power supply, VDD. They 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 usually swing in opposite phases between 0 V and VREF. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus. It is 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.

APPLICATIONS

Battery-powered equipment
Data acquisition systems
Medical instruments
Seismic data acquisition systems

Features and Benefits

Low power dissipation
400 μW at 100 kSPS (VDD only)
700 μW at 100 kSPS (total)
18-bit resolution with no missing codes
Throughput: 100 kSPS
INL: ±1 LSB typical,
±2 LSB maximum
SNR: 98 dB at 1 kHz
(VREF = 5 V)
SINAD: 97 dB at 1 kHz
THD: −120 dB at 10 kHz
Dynamic range: 99 dB
True differential analog input range: ±VREF
0 V to VREF with VREF between
2.4 V and 5.1 V
Allows use of any input range
Easy to drive with the ADA4941-1

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
Ability to daisy-chain multiple ADCs
10-lead package: MSOP and 3 mm × 3 mm LFCSP

Analog to Digital Converters

A/D Converters

Data Sheets

Document	note
AD7989-1/AD7989-5: 18-Bit, 100 kSPS/500 kSPS PulSAR ADCs in MSOP/LFCSP Data Sheet (Rev. A)	PDF 514 kB

Application Notes

Document	note
AN-935: Designing an ADC Transformer-Coupled Front End (Rev. 0)	PDF 363 kB
AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. B)	PDF 401 kB
AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0)	PDF 299 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD7989-1BCPZ-R2 Contact ADI	10 ld LFCSP (3x3mm)	REEL 250	-40 to 85C	9.2	7.8	Y
AD7989-1BCPZ-RL7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 85C	0	7.8	Y
AD7989-1BRMZ Production	10 ld MSOP	OTH 50	-40 to 85C	9.2	7.8	Y
AD7989-1BRMZ-RL7 Production	10 ld MSOP	REEL 1000	-40 to 85C	0	7.8	Y