AD7689 Series

16-Bit, 8-Channel, 250 kSPS PulSAR ADC

Catalog

16-Bit, 8-Channel, 250 kSPS PulSAR ADC

Part	Architecture	Ratio - S/H:ADC	Reference Type	Sampling Rate (Per Second)	Package / Case	Number of Bits	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]	Input Type	Features	Configuration	Number of Inputs	Voltage - Supply, Analog [Max]	Voltage - Supply, Analog [Min]	Mounting Type	Data Interface	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Number of A/D Converters	Input Range	Supplied Contents	Utilized IC / Part	Power (Typ) @ Conditions
Analog Devices AD7689CCPZRL7	SAR	1:1	External Internal	250 k	20-WFQFN Exposed Pad CSP	16	20-LFCSP (4x4)	125 °C	-40 °C	Differential Single Ended	Simultaneous Sampling Temperature Sensor	MUX-S/H-ADC	8	5.5 V	2.3 V	Surface Mount	Serial	5.5 V	2.3 V	1
Analog Devices EVAL-AD7689EDZ				250 k		16											Serial			1	±VREF	Board(s)	AD7689	12.5 mW
Analog Devices AD7689ACPZ	SAR	1:1	External Internal	250 k	20-WFQFN Exposed Pad CSP	16	20-LFCSP (4x4)	85 °C	-40 °C	Differential Pseudo-Differential Single Ended	Temperature Sensor	MUX-S/H-ADC	8	5.5 V	2.3 V	Surface Mount	DSP SPI	5.5 V	2.3 V	1

Catalog

16-Bit, 8-Channel, 250 kSPS PulSAR ADC

Key Features

• DownloadAD7689-KGD Data Sheet. Available as Known Good Die and fully guaranteed to data sheet specifications.

• 16-bit resolution with no missing codes

• 4-channel (AD7682)/8-channel (AD7689) multiplexer with choice of inputs

• Unipolar single-ended

• Differential (GND sense)

• Pseudobipolar

• Throughput: 250 kSPS

• INL: ±0.4 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR)

• Dynamic range: 93.8 dB

• SINAD: 92.5 dB at 20 kHz

• THD: −100 dB at 20 kHz

• Analog input range: 0 V to VREFwith VREFup to VDD

• Multiple reference typesInternal selectable 2.5 V or 4.096 VExternal buffered (up to 4.096 V)External (up to VDD)

• Internal selectable 2.5 V or 4.096 V

• External buffered (up to 4.096 V)

• External (up to VDD)

• Internal temperature sensor (TEMP)

• Channel sequencer, selectable 1-pole filter, busy indicator

• No pipeline delay, SAR architecture

• Single-supply 2.3 V to 5.5 V operation with 1.8 V to 5.5 V logic interface

• Serial interface compatible with SPI, MICROWIRE, QSPI, and DSP

• Power dissipation3.5 mW at 2.5 V/200 kSPS12.5 mW at 5 V/250 kSPS

• 3.5 mW at 2.5 V/200 kSPS

• 12.5 mW at 5 V/250 kSPS

• Standby current: 50 nA

• Low cost grade available

• 20-lead 4 mm × 4 mm LFCSP package

• 20-lead 2.4 mm × 2.4 mm WLCSP package

Description

TheAD7682/AD7689 are 4-channel/8-channel, 16-bit, charge redistribution successive approximation register (SAR) analog-to-digital converters (ADCs) that operate from a single power supply, VDD.The AD7682/AD7689 contain all components for use in a multichannel, low power data acquisition system, including a true 16-bit SAR ADC with no missing codes; a 4-channel (AD7682) or 8-channel (AD7689) low crosstalk multiplexer that is useful for configuring the inputs as single-ended (with or without ground sense), differential, or bipolar; an internal low drift reference (selectable 2.5 V or 4.096 V) and buffer; a temperature sensor; a selectable one-pole filter; and a sequencer that is useful when channels are continuously scanned in order.The AD7682/AD7689 use a simple serial port interface (SPI) for writing to the configuration register and receiving conversion results. The SPI interface uses a separate supply, VIO, which is set to the host logic level. Power dissipation scales with throughput.The AD7682/AD7689 are housed in a tiny 20-lead lead frame chip scale package (LFCSP) and 20-lead wafer level chip scale package (WLCSP) with operation specified from −40°C to +85°C. The AD7689 includes an extended temperature range model with specifications guaranteed to a maximum temperature (TMAX) of +125°C.APPLICATIONSMultichannel system monitoringBattery-powered equipmentMedical instruments: ECG/EKGMobile communications: GPSPower line monitoringData acquisitionSeismic data acquisition systemsInstrumentationProcess control